[0001]The present invention relates to a bag comprised of laminate and laminate.
BACKGROUND
[0002]A bag for containing the contents having fluidity, such as a liquid or powder, bags constructed from flexible packaging material is used. The bag has a main body contents are accommodated, is connected to the main body, and a spout through which the liquid when pouring the contents from the bag. Shape of the body portion and the spout portion is defined by a seal portion formed by heat sealing the flexible packaging.
[0003]
　Laminate constituting the flexible packaging material comprises a base material, is laminated on the base material, and the sealant layer melted by heat sealing, the. Layer structure of the laminate, for example, is determined from the viewpoint of mechanical strength. For example, in Patent Document 1, the outer surface of the laminate is constituted by nylon, the inner surface of the laminate is constituted by polyethylene. Nylon, such as penetration resistance, contributes to the improvement of the mechanical strength of the laminate.
CITATION
Patent Document
[0004]
Patent Document 1: Laid-Open Patent Publication No. 10-218204
Summary of the Invention
Problems that the Invention is to Solve
[0005]
　In the manufacturing process of the bag, a portion of the outer edge of the bag is heat sealed inner surfaces of the laminate so as to leave as an opening. Then, filling the contents into the bag through the opening. Then, to seal the opening by heat sealing. In this way, it is possible to obtain a bag contents is accommodated. Such bag manufacturing process may include the step of frictional force is generated on the outer surface of the bag. For example, the step of pulling a single bag from a plurality of bags stacked, step, etc. sliding the bag in a state in which contents are housed in a conveyance path. To efficiently implementation of these steps, it is preferable friction coefficient of the outer surface of the bag is small.
[0006]
　By the way, nylon has hygroscopic. Therefore, the outer surface of the laminate, i.e., the outer surface of the bag is constituted by nylon, the friction coefficient of the outer surface of the bag by nylon absorbs moisture in the ambient atmosphere is increased. As a result, frictional force increases occurring on the outer surface of the bag, it is conceivable that trouble occurs in a part of the bag manufacturing process.
[0007]
　The present invention aims at providing such a problem effectively resolved can laminate.
Means for Solving the Problems
[0008]
　The present invention is a laminate comprising an outer surface and an inner surface, has a plastic film containing 51 mass% or more of polybutylene terephthalate, a base material forming the exterior surface of the laminate, the inner surface of the laminate and a sealant layer forming the layer constituting the outer surface of the laminate of the substrate comprises polyethylene terephthalate or polybutylene terephthalate, a laminate.
[0009]
　In the laminate according to the present invention, the laminate 2 was prepared and measured after storage for 48 hours at a high temperature thermostat at a temperature 40 ° C. and 90% humidity, the outer surface of one of the laminate, the other of said static friction coefficient and dynamic friction coefficient against the outer surface of the laminate, may be 0.24 or less.
[0010]
　In the laminate according to the present invention, the laminate 2 was prepared and measured after storage for at least 24 hours at a temperature 20 ~ 30 ° C. and humidity of 40 to 60 percent of the environment, the outer surface of one of the laminate, the static and kinetic coefficients of friction for the exterior surface of the other of the laminate referred to as normal temperature static friction coefficient and normal temperature coefficient of kinetic friction, after measurement of the room temperature static friction coefficient and normal temperature dynamic friction coefficient, two of the laminated body temperature 40 ° C. and 90% humidity high temperature is measured after storage for 48 hours at a constant temperature bath, the outer surface of one of the laminate, if the static friction coefficient and dynamic friction coefficient against the outer surface of the other of the laminate referred to as high-temperature and high Shimesei friction coefficient and high temperature and high Shimedo friction coefficient , a value obtained by subtracting the normal temperature coefficient of static friction from the high temperature and high Shimesei friction coefficient is 0.03 or less, and, from the high temperature and high Shimedo friction coefficient Serial minus ambient temperature coefficient of dynamic friction value may be 0.03 or less.
[0011]
　In the laminate according to the present invention, the plastic film containing 51 mass% or more of polybutylene terephthalate, may also have a multilayer structure comprising more than 10 layers.
[0012]
　In the laminate according to the present invention, the plastic film containing 51 mass% or more of polybutylene terephthalate, consists of a single-layer structure, and, IV values ​​of poly butylene les terephthalate 1.10 dl / g or more and 1.35dl / g it may be less than or equal to.
[0013]
　In the laminate according to the present invention, the substrate has only one said plastic film containing 51 mass% or more of polybutylene terephthalate, the sealant layer may comprise a linear low density polyethylene. Piercing strength of the laminate is preferably 12N or more. Laminate may further comprise a deposition layer located on the surface of the substrate. Laminate may further comprise a gas barrier coating film located on the deposited layer.
[0014]
　Laminate according to the present invention, from the outer surface side to the inner surface, a first substrate constituting the outer surface, a second substrate, and the sealant layer constituting the inner surface, at least comprising in this order,
　the first the substrate comprises polyethylene terephthalate or 51 wt% or more of polybutylene terephthalate or 51 wt%, when the first substrate comprises polyethylene terephthalate 51 wt% or more, the second substrate is 51 mass% it may contain more than polybutylene terephthalate. Stack may further comprise at least deposition layer positioned either between the sealant layer or between said second substrate and said second substrate and said first substrate. Laminate may further comprise a gas barrier coating film located on the deposited layer. Stack it may further include a printed layer disposed between the second substrate and the first substrate. The sealant layer may comprise a linear low density polyethylene. Piercing strength of the laminate is preferably 13N or more. Wherein the first substrate comprises a polybutylene terephthalate, the second substrate may also include a polyethylene terephthalate. Or, wherein the first substrate comprises polyethylene terephthalate, the second substrate may also comprise polybutylene terephthalate.
[0015]
　The present invention relates to a bag having a spout portion connected to the main body portion and said body portion comprises a laminate described above, a seal portion for joining the inner surfaces of the laminate, and a bag.
The invention's effect
[0016]
　According to the present invention, it is possible to provide a laminate having a penetration resistance and slip properties.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017]
FIG. 1 is a front view showing the bag in the first embodiment of the present invention.
Is a cross-sectional view illustrating an example of FIG. 2 the layer structure of the laminate in the first embodiment.
3 is a sectional view showing another example of the layer structure of the laminate of the first embodiment.
It is a sectional view showing an example of FIG. 4 layer structure of a first film of the laminate.
[5] The transparent deposition layer deposited on a substrate, a diagram illustrating an example of a result of analyzing by time-of-flight secondary ion mass spectrometer.
6 is a sectional view showing an example of the layer structure of the laminate in the second embodiment.
7 is a sectional view showing another example of the layer structure of the laminate in the second embodiment.
8 is a diagram showing an example of a method for measuring the puncture strength.
9 is a graph showing measurement results of the friction coefficient of Example A1, A2 and Comparative Example A1.
Is a diagram showing FIG. 10 layer structure and evaluation results of Examples A1, A2 and Comparative Example A1.
11 is a front view showing a bag manufactured in Examples B1 ~ B7.
[12] in the case of using the bag of the first capacitor, a diagram illustrating a normal temperature drop evaluation and results of low-temperature drop Evaluation of Examples B1 ~ B7.
[13] in the case of using the bag of the second capacitor is a diagram illustrating a normal temperature drop evaluation and results of low-temperature drop Evaluation of Examples B1 ~ B7.
14 is a diagram showing the measurement results of the friction coefficient of Example D1 ~ D3 and Comparative Example D1.
15 is a diagram showing a layer structure and evaluation results of Examples D1 ~ D3 and Comparative Example D1.
[16] in the case of using the bag of the first capacitor is a diagram showing the results of room temperature drop rating and a low temperature falling Evaluation of Examples E1 ~ E7.
[Figure 17] in the case of using the bag of the second capacitor is a graph showing the results of room temperature drop rating and a low temperature falling Evaluation of Examples E1 ~ E7.
DESCRIPTION OF THE INVENTION
[0018]
　 First Embodiment
[0019]
　Referring to FIGS, illustrating an embodiment of the present invention. In the accompanying drawings to the present specification, for convenience of easy understanding and illustration, the scale and aspect of the dimensional ratio and the like, are exaggerated appropriately changed from those of the real.
[0020]
　Also, as used herein, identifies the shape and geometric conditions and the degree thereof, such as "parallel", the "orthogonal", terms and the length of such "identity" and angle values ​​or the like, exact meaning without being bound, and interpreting including range that can expect a similar function.
[0021]
　 Bag
　Figure 1 is a front view showing a bag 10 according to this embodiment. Bag 10 is configured to accommodate the contents having fluidity such as liquid or powder to be refilled into the bottle. In FIG. 1, the bag 10 in a state before the contents are filled (a state where contents are not accommodated) are shown. The liquid contained in the bag 10, can have various liquids, such as liquid detergents and shampoos.
[0022]
　In this embodiment, the bag 10 is self-standing constructed bag of the gusset type. Bag 10 includes a top 11, bottom 12 and side 13, having a substantially rectangular outline in a front view. Note that "top", the name, such as "lower" and "side", and "upper", terms such as "below", bags state the bag 10 by the gusset portion to the lower is standing on its own as a reference only 10 or those which relative position and orientation of the components. Etc. during transportation and during use orientation of the bag 10 are not limited by name or term in this specification.
[0023]
　As shown in FIG. 1, the bag 10 includes a main body 17 which contents are accommodated, and a spout portion 20 connected to the main body 17, a. Spout 20 is a portion through which the liquid in the contents removed from the bag 10. Note the width of the outlet portion 20 is narrower than the width of the body portion 17. Therefore, the user, the pouring direction of the contents to be dispensed from the bag 10 through the spout portion 20 can be determined accurately.
[0024]
　Hereinafter, a description will be given of a specific configuration of the bag 10 comprising a body portion 17 and the spout 20. As shown in FIG. 1, the bag 10, the surface film 14, the back surface film 15 constituting the rear surface constituting the surface and comprises a bottom film 16 constituting the lower 12. Bottom film 16 is in a state of being folded at the folded portion 16f, it is disposed between the surface film 14 and the back film 15.
[0025]
　Incidentally, the above-mentioned "surface film", the term "back film" and "lower film", only those partitioning the film according to the positional relationship, provides a method of film in the production of bags 10, It is not limited by the above terms. For example, the bag 10 may be surface film 14 and the back film 15 and bottom film 16 is manufactured by using one sheet of film which is continuously provided, the surface film 14 and bottom film 16 of one which is continuously provided film and may be manufactured using a total of two films of one backside film 15, one surface film 14 and one backside film 15 one the total of three films in the bottom film 16 it may be fabricated using.
[0026]
　Surface film 14, the back surface film 15 and bottom film 16, inner faces are joined by a seal portion. Plan view odor bag 10, such as Figure 1, hatching is applied to the seal portion.
[0027]
　As shown in FIG. 1, the sealing portion has an outer edge seal portion extending along the outer edge of the bag 10. Outer sealing portion, a lower seal portion 12a extending in the lower 12, and includes a pair of side seal portion 13a extending along the pair of side portions 13. The sealing unit includes a spout seal portion 20a defining a spout portion 20. If spout 20 as shown in FIG. 1 is formed in the corner portion between the upper 11 and the side 13 of the bag 10, spout seal portion 20a is connected to the side seal portion 13a. In the bag 10 in a state where contents are not accommodated, as shown in FIG. 1, top 11 of the bag 10 is in the opening 11b. After receiving the contents of the bag 10, by joining the inner surface of the inner surface and the back film 15 of the surface film 14 in the upper 11, the bag 10 is sealed upper seal portion is formed.
[0028]
　Side seal portion 13a, the spout seal portion 20a and an upper seal portion, which will be described later, a seal portion formed by joining the inner surface of the inner surface and the back film 15 of the surface film 14. On the other hand, the lower sealing part 12a, the seal portion constituted by joining the inner surface of the surface film 14 and the inner surface of the lower film 16, and, by joining the inner surfaces of the lower film 16 of the back film 15 including configured seal.
[0029]
　By joining opposing film together as long as it is possible to seal the bag 10, there is no possibility that a method for forming a seal portion is particularly limited. For example, heating the inner surface of the film is melted by the like, by welding inner faces, i.e. the heat seal may form a seal portion. Or, by adhering the inner surfaces of the film which faces with an adhesive, it may form a seal portion.
[0030]
　 Peelable means
　the surface film 14 and the back surface film 15 may be easily openable means 25 is provided for opening the spout portion 20 by tearing surface film 14 and the back surface film 15. For example, as shown in FIG. 1, the easy-open means 25, Note formed spout seal portion 20a of the outlet portion 20 may include a notch 26 serving as a starting point for tearing. Also, the portion serving as the route of tearing the spout portion 20, as easy-open means 25, may be half-cut line formed by a laser processing or the cutter is provided.
[0031]
　Further, although not shown, the easy-open means 25 may include a surface film 14 and casting cut outlet seal portion 20a is formed in a region which is formed and scar group of backside film 15. Scar group, for example, may include a plurality of through-holes formed so as to penetrate the surface film 14 and / or back surface film 15. Or, scar group may include a surface film 14 and / or the back film 15 so as not to penetrate the surface film 14 and / or a plurality of holes formed on the outer surface of the back film 15.
[0032]
　 Layer structure of surface film and back film
　will now be described layer structure of surface film 14 and the back surface film 15. Figure 2 is a sectional view showing an example of the laminate 30 constituting the surface film 14 and the back surface film 15. 3 is a sectional view showing another example of the laminated body 30 constituting the surface film 14 and the back surface film 15.
[0033]
　As shown in FIGS. 2 and 3, the laminate 30 includes a first film 40, a sealant film 70, an adhesive layer 45 for bonding the first film 40 and sealant film 70. The first film 40 is located on the outer surface 30y side, the sealant film 70 is positioned on the inner surface 30x side opposite the outer surface 30y. Inner surface 30x is a surface located on the contents side. The first film 40 comprises at least a substrate 41 constituting the outer surface 30y. Sealant film 70 includes at least a sealant layer 71. The first film 40, as shown in FIG. 2, may further include a printing layer 38 located between the substrate 41 and the sealant layer 71. Laminate 30 shown in FIG. 2, in order to the inner surface from the outer surface side
　　substrate / printed layer / adhesive layer / sealant layer
comprises a, and say. It should be noted that, "/" represents the boundary of the layer and the layer.
[0034]
　As shown in FIG. 3, the first film 40 may further comprise a gas barrier layer 35 located between the substrate 41 and the print layer 38. Figure laminate 30 shown in 3, in order to the inner surface from the outer surface side
　　substrate / transparent gas barrier layer / print layer / adhesive layer / sealant layer
comprises a, and say.
[0035]
　Hereinafter, the first film 40, the adhesive layer 45 and sealant film 70 will be described in detail respectively.
[0036]
　(First film)
　or less, the base material 41 of the first film 40, respectively will be described print layer 38 and the gas barrier layer 35.
[0037]
　[Substrate]
　substrate 41 only one have a base material constituting the outer surface 30y of the stack 30. That is, the plastic film constituting the substrate 41 is only one. As long as the plastic film constituting the base material 41 in the laminate 30 is one, the plastic film constituting the substrate 41 may be composed of a single layer, it is composed of a plurality of layers it may be. If the plastic film constituting the substrate 41 comprises a plurality of layers, plastic films constituting the substrate 41 is, for example, a coextrusion film produced by coextrusion.
[0038]
　Plastic film is a layer constituting the outer surface 30y in the base material 41, polybutylene terephthalate (hereinafter, also referred to as PBT) as the main component including. For example, plastic films constituting the substrate 41, including 51 mass% or more PBT. Hereinafter, the plastic film constituting the substrate 41 will be described benefits of including PBT.
[0039]
　PBT has excellent dimensional stability, thus is excellent in printability. Thus, polyethylene terephthalate (hereinafter, referred to as PET) as in the case of, it can be provided a printed layer 38 on the substrate 41 including the PBT.
[0040]
　Also, PBT has a high strength. Therefore, as with laminate 30 constituting the bag 10 comprises a nylon, it can have a penetration resistance to the bag 10.
[0041]
　Also, PBT has a characteristic that it is difficult to absorb water as compared to nylon. Therefore, it is possible to suppress the coefficient of friction of the outer surface 30y of the base material 41 is the laminate strength of the laminate 30 absorbs moisture decreases, the first film 40 is increased.
[0042]
　Hereinafter, a detailed description of the construction of the substrate 41 including the PBT. In this embodiment, the configuration of the substrate 41 including the PBT, may employ any of the first configuration or the second configuration below.
[0043]
　[First configuration of the base material]
　The content of PBT in the substrate 41 according to the first configuration is preferably at least 51 wt%, more preferably at least 60 wt%, more than 70 mass%, in particular 75 preferably more mass%, most preferably at least 80 wt%. The content of PBT by more than 51% by weight, can have excellent impact strength and pinhole resistance in the first film 40.
[0044]
　PBT is used as a main component, a dicarboxylic acid component is preferably terephthalic acid is 90 mol%, more preferably at least 95 mol%, more preferably at least 98 mol%, and most preferably 100 is the mole percent. Preferably 1,4-butanediol as a glycol component is not less than 90 mol%, more is preferably 95 mol% or more, more preferably 97 mol% or more, and most preferably, at the time of polymerization of 1,4 except byproduct produced by the ether bond of butanediol is not included.
[0045]
　Substrate 41 may include a polyester resin other than PBT. Thus, for example, a film-like substrate 41 can be adjusted mechanical properties of film formability and substrate 41 of case of biaxial stretching.
　The polyester resin other than PBT, PET, polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), other polyester resins such as polypropylene terephthalate (PPT), isophthalic acid, orthophthalic acid, naphthalene dicarboxylic acid, biphenyl dicarboxylic acid , cyclohexane dicarboxylic acid, adipic acid, azelaic acid, and PBT resin dicarboxylic acid is copolymerized, such as sebacic acid, ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, neopentyl glycol, 1,5 - pentanediol, 1,6-hexanediol, diethylene glycol, cyclohexanediol, polyethylene glycol, polytetramethylene glycol, diol and polycarbonate diol Min can be mentioned copolymerized PBT resin.
[0046]
　The addition amount of the polyester resin other than the above PBT is preferably 49 wt% or less, more preferably 40% by mass. If the amount of the polyester resin other than PBT exceeds 49 mass%, mechanical properties of the PBT is impaired, impact strength and pinhole resistance, it is considered that drawing formability becomes insufficient.
[0047]
　Substrate 41, as an additive, flexible polyether component, polycarbonate component may include a polyester and polyamide elastomer obtained by copolymerizing at least one of the polyester components. This makes it possible to improve pinhole resistance at the time of bending. The addition amount of the additive is, for example, 20% by mass. When the amount of the additive exceeds 20 wt%, and that the effect of the additive is saturated, transparency of the substrate 41 can occur and be lowered.
[0048]
　An example of a method of making a film-like base material 41 according to the first configuration will be described. Here, a method for producing a film-like base material 41 by casting. More specifically, a method for casting and multi-layered resin of the same composition at the time of casting.
[0049]
　For PBT is fast crystallization rate, crystallization proceeds even at the time of casting. In this case, when cast as a single layer without multilayered, because there is no barrier, such as to be able to suppress the growth of crystals, crystal will grow to a larger size, resulting unstretched raw film the yield stress increases of. Therefore, it becomes easy to break unstretched raw an in biaxial orientation. Moreover, the yield stress of the obtained biaxially oriented film becomes high, it is considered that the moldability of the biaxially stretched film becomes insufficient.
　In contrast, if multi-layered same resin during casting, it is possible to reduce the stretching stress of the undrawn sheet. Therefore, it is possible to stably biaxially oriented, also, the yield stress of the obtained biaxially stretched film becomes low. Thus, it is possible to obtain a highly flexible and breaking strength film.
[0050]
　Figure 4 is a sectional view showing an example of the layer structure of the first film. If the substrate 41 by casting the resin multilayered is produced, as shown in FIG. 4, the substrate 41 of the first film 40 is made of a multilayer structure including a plurality of layers 41a. Each of the plurality of layers 41a may include a PBT as a main component. For example, each of the plurality of layers 41a preferably comprises 51 mass% or more PBT, more preferably 60 mass% or more of PBT. In the plurality of layers 41a, n + 1 th layer 41a is stacked directly on the n-th layer 41a. That is, between a plurality of layers 41a, the adhesive layer and the adhesive layer is not interposed.
[0051]
　The cause of the characteristics of the PBT film is improved by the multi-layer is estimated as follows. When laminating the resin, the composition of the resin in the case of the same there is an interface layer, the crystallization is accelerated by the interface. On the other hand, the growth of large crystals that exceeds the thickness of the layer is suppressed. Therefore, it is considered that the size of the crystals (spherulites) decreases.
[0052]
　As a specific method for reducing the size of the spherulites by multilayered, the general multi-layered device (multi-layer feed block, a static mixer, such as multi-layer multi-manifold) can be used. For example, it is possible to use a method in which laminating a thermoplastic resin fed from different flow paths using two or more units of extruder feed block and a static mixer, such as a multilayer by using a multi-manifold die. In the case of multi-layered resin of the same composition, using only a single extruder, it is also possible to introduce the above-mentioned multilayered device in the melt line from an extruder to the die.
[0053]
　Substrate 41 is at least 10 layers or more, preferably 60 or more layers, more preferably 250 layers or more, more preferably a multilayer structure including the 1000 or more layers 41a. By increasing the number of layers, it is possible to reduce the size of spherulites in the PBT of the unstretched raw state, subsequent biaxial stretching can be carried out stably. Further, it is possible to reduce the yield stress of PBT state of biaxially oriented film. Preferably, the diameter of spherulites in the PBT of the unstretched raw is 500nm or less.
[0054]
　Of making the unstretched raw film biaxially stretched to biaxially oriented films of PBT, longitudinal stretching direction (hereinafter, MD) stretching temperature in (hereinafter, referred to as MD stretching temperature) is preferably 40 ° C. or higher There, more preferably 45 ° C. or higher. The MD stretching temperature by the 40 ° C. or higher, it is possible to prevent the breakage of the film occurs. Further, MD stretching temperature is preferably not 100 ° C. or less, more preferably 95 ° C. or less. By the MD stretching temperature to 100 ° C. or less, it is possible to suppress the phenomenon does not occur orientation of the biaxially oriented film.
[0055]
　Stretch ratio in the MD (hereinafter, referred to as MD stretching ratio) is preferably 2.5 times or more. Thus, to align the biaxially oriented film, it is possible to achieve good mechanical properties and uniform thickness. MD stretching ratio is, for example, 5 times or less.
[0056]
　Transverse stretching direction (hereinafter, referred to as TD) stretching temperature in (hereinafter, referred to as TD stretching temperature) is preferably 40 ° C. or higher. The TD stretching temperature by the 40 ° C. or higher, it is possible to prevent the breakage of the film occurs. Further, TD stretching temperature is preferably 100 ° C. or less. By the TD stretching temperature to 100 ° C. or less, it is possible to suppress the phenomenon does not occur orientation of the biaxially oriented film.
[0057]
　Stretching ratio in TD (hereinafter, also referred to as a TD stretching ratio) is preferably 2.5 times or more. Thus, to align the biaxially oriented film, it is possible to achieve good mechanical properties and uniform thickness. MD stretching ratio is, for example, 5 times or less.
[0058]
　TD relaxation ratio is preferably at least 0.5%. Thus, it is possible to prevent the breakage at the time of heat-setting the biaxially oriented film of PBT results. Further, TD relax ratio is preferably 10% or less. Thus, it is possible to suppress the like slack thickness unevenness occurs in the biaxially oriented film of PBT.
[0059]
　The thickness of the layer 41a of the substrate 41 shown in FIG. 4 is preferably 3nm or more, and more preferably 10nm or more. The thickness of the layer 41a is preferably not 200nm or less, more preferably 100nm or less, and more preferably not more than 75 nm.
　The thickness of the substrate 41 is preferably 9μm or more, more preferably 12μm or more. The thickness of the substrate 41 is preferably not 25μm or less, more preferably 20μm or less. By setting the thickness of the substrate 41 than 9 .mu.m, substrate 41 will have sufficient strength. Further, by setting the thickness of the base material 41 to 25μm or less, it exhibits a superior formability substrate 41. Therefore, it is possible to carry out the process for manufacturing the processed bag 10 a laminate 30 comprising a substrate 41 efficiently.
[0060]
　If the base material 41 as described above consists of a multilayer structure including a plurality of layers 41a, some of the plurality of layers 41a, may include a polyester resin other than PBT as a main component. For example, substrate 41 includes a plurality of layers 41a containing PBT as a main component, located between the two PBT layers 41a, for example PET may be configured by a layer 41a containing as a main component. That is, a layer 41a comprising PBT as a main component, the substrate 41 may be constituted by alternately stacking a layer 41a containing as a main component, for example, PET.
[0061]
　Second configuration of the substrate]
　substrate 41 according to the second configuration, a single layer film comprising a polyester butylene terephthalate as the main repeating unit. For example, substrate 41 1,4-butanediol as a glycol component, or its ester-forming derivative of terephthalic acid as the dibasic acid component, or as a main component an ester-forming derivative, they fused including are homo- or copolymer type polyester, obtained Te. The content of PBT in the substrate 41 according to the second configuration, preferably at least 51 wt%, more preferably at least 60 wt%, more preferably at least 70 wt%, more preferably at least 80 wt%, and most preferably is at least 90 mass%. Further, the substrate 41 according to the second configuration, it is preferably composed of only the polybutylene terephthalate and the additive.
[0062]
　In order to impart mechanical strength to the substrate 41, of PBT, melting point 200 ° C. or higher and 250 ° C. or less, IV value is preferably from less 1.10 dl / g or more and 1.35dl / g. Furthermore, melting point of 215 ° C. or higher and 225 ° C. or less, IV value or less are particularly preferred 1.15 dl / g or more and 1.30 dl / g. These IV values, may be filled by the overall material constituting the substrate 41. IV value, JIS K 7367-5: may be calculated based on 2000.
[0063]
　Substrate 41 according to the second configuration, a polyester resin other than PBT, such as PET may be contained in an amount below 30 wt%. Due to the substrate 41 comprises PET in addition to PBT, can be suppressed PBT crystallization, thereby improving the stretchability of the PBT film. The PET to be blended in the PBT of the base material 41, a polyester containing ethylene terephthalate as the main repeating unit. For example, ethylene glycol as the glycol component, can be preferably used homotypic mainly containing terephthalic acid as the dibasic acid component. In order to impart good mechanical strength properties, of the PET, melting point 240 ° C. or higher and 265 ° C. or less, IV value is preferably from less 0.55 dl / g or more and 0.90 dl / g. Furthermore, melting point of 245 ° C. or higher and 260 ° C. or less, IV value or less are particularly preferred 0.60 dl / g or more and 0.80 dl / g.
　By the amount of PET below 30 wt%, it is possible to prevent the rigidity of the unstretched raw and stretching the film becomes too high. Thus, the stretched film becomes brittle, pressure resistance of the stretched film, impact strength, etc. puncture strength can be suppressed to decrease. Further, it is possible to prevent the stretching upset when stretching the unstretched raw film is produced.
[0064]
　Substrate 41, if necessary, a lubricant, an antiblocking agent, inorganic fillers, antioxidants, ultraviolet absorbers, antistatic agents, flame retardants, plasticizers, colorants, crystallization inhibitors, crystallization promoter additives may include equal. Further, the polyester resin pellets used as the raw material of the substrate 41, to avoid viscosity reduction due to hydrolysis during heat-melting, water content 0.05 wt% or less before heat-melted, preferably not more than 0.01 wt% preferred for use is in terms of a sufficient preliminary drying was carried out so as to.
[0065]
　An example of a method of making a film-like base material 41 according to the second configuration will be described.
[0066]
　To stably produce a film of the base material 41 of the structure described above, to suppress the growth of crystals in the state of the unstretched raw sheet becomes important. Specifically, when forming by cooling the extruded PBT-based melt is cooled at a higher rate in the crystallization temperature region of the polymer, i.e. raw cooling rate is an important factor. Raw cooling rate, for example, 200 ° C. / sec or more, preferably 250 ° C. / sec or higher, particularly preferably 350 ° C. / sec or more. High cooling rate unstretched raw which is formed in, because it maintains a low crystalline state, thus improving the bubble stability during stretching. Furthermore, since it is possible even film formation at a high speed, thereby improving productivity of the film. If the cooling rate is less than 200 ° C. / sec, stretchability increases the crystallinity of the unstretched raw obtained may deteriorate. Also, in extreme cases, stretching bubble burst is also contemplated that stretching does not continue.
[0067]
　Unstretched raw film comprising PBT as a main component, the ambient temperature 25 ° C. or less, preferably while maintaining the 20 ° C. or less, are preferably transported to the space for performing the biaxial stretching. Accordingly, even when the retention time is long, it is possible to maintain the unstretched raw sheet of a crystalline immediately after the film formation.
[0068]
　Biaxial stretching method to obtain a stretched film by stretching the unstretched raw film is not particularly limited. For example, the tubular method or tenter method, vertical and horizontal directions may be simultaneously stretched, or the longitudinal and transverse directions may be sequential stretching. Among them, tubular method may circumferential balance of physical properties to obtain a satisfactory stretched film is particularly preferably employed.
[0069]
　In tubular method, unstretched raw guided in stretching space, after being inserted between a pair of low-speed nip rolls, heated at a stretching heater while pressed air into. After stretching completion, the stretched film, air is blown by the cooling shoulder air ring. Draw ratio, the strength properties of the stretched stability and stretched film, transparency, and in consideration of the thickness uniformity, MD, and TD is preferably at most and 4.5 times 2.7 times or more, respectively. By the stretching ratio more than 2.7 times, it is possible to secure a sufficient tensile modulus and impact strength of the stretched film. Further, by setting the draw ratio to 4.5 times or less, the strain of excessive molecular chains is suppressed from occurring by stretching, it is possible to suppress the breakage or puncture occurs during stretching, stabilize the stretched film it can be made to.
[0070]
　The stretching temperature is preferably 40 ° C. or higher and 80 ° C. or less, particularly preferably and 65 ° C. 45 ° C. inclusive. Unstretched raw manufactured in high above cooling rate has a low crystallinity, even when the stretching temperature is a relatively low temperature, it can be stretched stably unstretched raw. Further, by the stretching temperature to 80 ° C. or less, and suppress the sway of the stretched bubble, it is possible to obtain a good stretched film of thickness accuracy. Further, by the stretching temperature to 40 ° C. or higher, to suppress the excessive stretch orientation crystallization by cold drawing occurs, it is possible to prevent the whitening and the like of the film.
[0071]
　Substrate 41 manufactured as described above, for example, is constituted by a single layer comprising a polyester butylene terephthalate as the main repeating unit. According to the manufacturing method described above, since the formation of the unstretched raw sheet at a high cooling rate even when unstretched raw film is constituted by a single layer, it is possible to maintain a low crystalline state, Therefore, it is possible to stretch the stable unstretched raw.
[0072]
　[Print Layer]
　Printing layer 38 is a layer printed on the substrate 41 in order to grant or aesthetics or indicate product information on the bag 10. Print layer 38 expresses characters, numbers, symbols, graphics, pictures and the like. The material constituting the printing layer 38, it is possible to use ink and ink for flexographic printing for gravure printing. Specific examples of the inks for gravure printing, can be mentioned Finato made of DIC Graphics Corporation.
[0073]
　[Gas barrier layer]
　The gas barrier layer 35 is formed on the surface of the inner surface 30x side of the substrate 41, including at least a vapor-deposited layer 36 made of an inorganic material. Further, the gas barrier layer 35 may further comprise a gas barrier coating film 37 located on the surface of the inner surface 30x side of the deposition layer 36.
[0074]
　Deposited layer 36 functions as a layer having a function of the gas barrier that prevents transmission such as oxygen gas and water vapor. Incidentally, the vapor deposition layer 36 may be provided two or more layers. If having a vapor deposited layer 36 two or more layers, each of which may be the same composition or a different composition. As a method for forming the vapor deposition layer 36, for example, vacuum deposition, sputtering, and ion plating - physical vapor deposition of plating method (Physical Vapor Deposition method, PVD method), or plasma enhanced chemical vapor deposition, thermal chemical vapor deposition, and photochemical vapor deposition of chemical vapor deposition (chemical vapor deposition method, CVD method) and the like.
[0075]
　In this embodiment, the deposition layer 36 is aluminum oxide (aluminum oxide), such as silicon oxide, which is preferably an inorganic material having transparency. Since the deposition layer 36 has transparency, the user, the print layer 38 located on the inner surface 30x side of the deposition layer 36 can be viewed from the outer surface 30y side. The deposited layer 36, it is preferable to use a non-crystalline thin film of aluminum oxide. Specifically, the deposition layer 36 has the formula AlO X (wherein, X represents. A number in the range of 0.5 to 1.5) is a non-crystalline thin film of aluminum oxide which is represented by. Deposited layer 36 may use a non-crystalline thin film of aluminum oxide which the value of X along the depth direction toward the inner surface of the membrane surface is reduced. Non-crystalline thin film of aluminum oxide, wherein AlO X (wherein, X represents. A number in the range of 0.5 to 1.5) is represented by, in the depth direction toward the inner surface of the thin film surface it is preferable that the value of the headed X is increasing. As the value of X in the above formula, basically, it is possible to use the X = 0.5 or more of, when less than X = 1.0, coloring violently, and transparent since the inferior sex, it is preferable to use the X = 1.0 or more. Further, those of X = 1.5, since those states Al and oxygen was completely oxidized, the upper limit can be used as up to X = 1.5. Incidentally, if the value of X in the above formula is zero, a complete inorganic simple substance (pure substance), not transparent.
[0076]
　Incidentally, reduction ratio of the value of X, for example, X-ray photoelectron spectrometer (Xray Photoelectron Spectroscopy: XPS), secondary ion mass spectrometer (Secondary Ion Mass Spectroscopy: SIMS) using a surface analyzer such as the depth direction using the method of and analyze such as ion etching, it can be confirmed from performing the elemental analysis of the deposited layer 36.
[0077]
　
　The following describes a first preferred embodiment of the deposition layer 36. Deposition layer 36 may be a layer comprising a mixture of inorganic compounds containing covalent bonds of aluminum atoms and carbon atoms. In this case, the deposition layer 36, X-ray photoelectron spectrometer: covalent bonds (Measurement conditions X-ray source AlK, X-ray output 120 W) using the aluminum atom to the peak as measured by ion etching in the depth direction and the carbon atom indicates the presence of, also, has transparency and oxygen, may have a gas barrier property that prevents the permeation of water vapor or the like.
[0078]
　The interface between the deposited layer 36 and the substrate 41 is a covalent bond of the metal and carbon atoms may be formed. For example, if the deposited layer 36 comprises aluminum oxide, the interface between the substrate 41 and the vapor deposition layer 36 can be made to covalently bond the aluminum atoms and carbon atoms are formed. Covalent bond, measured by X-ray photoelectron spectroscopy (hereinafter abbreviated as "XPS measurement") it can be detected by.
[0079]
　Further, in the vapor deposition layer 36, the abundance ratio of the covalent bond of the aluminum atoms and carbon atoms, of the total bonds including carbon atoms that is observed when measuring the interface between the deposited layer 36 and the substrate 41 by XPS measurement it is preferably in the range and below 30% 0.3% or more. Thus, enhanced adhesion between the vapor deposition layer 36 and the substrate 41, excellent transparency, those good performance balanced is obtained as a gas barrier property of the deposited film.
[0080]
　When the presence ratio of the covalent bond of the aluminum atoms and carbon atoms is less than 0.3%, the improvement of adhesion of the deposited layer 36 is insufficient, it is difficult to maintain the barrier property stably.
[0081]
　Furthermore, the deposited layer 36 mainly containing aluminum oxide, AL (aluminum) / O (oxygen) ratio, from the interface between the substrate 41 and the vapor deposition layer 36, the deposition layer 36 opposite the substrate 41 in towards the surface within a range of up to 3 nm, it is preferably 1.0 or less.
　From the interface between the deposited layer 36 and the substrate 41, the extent towards the surface of the opposite side of the deposition layer 36 and the substrate 41, the ratio of AL / O exceeds 1.0, the base material 41 deposited layer adhesion becomes insufficient between 36 and increasing the proportion of aluminum, the transparency of the deposited layer 36 is reduced.
[0082]
　The thickness of the deposited layer 36 is, for example, and 200Å or 20 Å, preferably at and above 30 Å 150 Å. If it is less than 30 Å, even when combined with a gas barrier coating film 37 in some cases the gas barrier property becomes insufficient. On the other hand, when it exceeds 150 Å, it may not be possible to maintain the gas barrier performance of the laminate 30. The reason is not clear, the thickness of the deposited layer 36 is reduced flexibility of the laminate 30 exceeds 150 Å, cracks or pinholes in a part of the deposited layer 36 when the laminate 30 is used in the bag 10 There the gas barrier property is considered to decrease occurred. The thickness of the deposited layer 36 is preferably 40 Å or more and 130Å or less, more preferably 50Å or more and 120Å or less. The thickness of the deposited layer 36, for example, fluorescent X-ray analyzer (trade name: RIX2000 type, manufactured by Rigaku Corporation) using, can be measured by fundamental parameter method. As the means for changing the thickness of the deposited layer 36, it is possible to perform a method of changing the deposition rate of the deposited layer 36, such as by modifying the rate of evaporation.
[0083]
　When forming the deposited layer 36 on the surface of the inner surface 30x side of the substrate 41, in advance to corona discharge treatment on the surface of the inner surface 30x side of the substrate 41, the frame processing, may be subjected to a plasma treatment. In particular, the interface between the deposited layer 36 and the substrate 41, in the case of forming a covalent bond of the metal and carbon atoms may be subjected to pre-treatment to the plane of the substrate 41 to be formed a deposition layer 36 It is preferred. If the pretreatment is a plasma treatment, the pre-processing device, in the following reduced pressure environment 0.1Pa above 100 Pa, and supplies the plasma to the surface of the substrate 41. Plasma, using inert gas alone or oxygen such as argon, nitrogen, carbon dioxide gas and a gas mixture thereof with one or more gases as a plasma source gas, the potential difference due to the high frequency voltage, etc., the plasma source gas in the excited state by, it can be generated.
[0084]
　The pretreatment can be confined plasma in the vicinity of the surface of the substrate 41. This makes it possible to shape of the surface of the substrate 41, by changing the chemical bonding state or a functional group, alters the chemical properties of the surface of the substrate 41. Thus, it is possible to improve the adhesion between the substrate 41 and the vapor deposition layer 36.
[0085]
　
　Next, a description is given of a second preferred form of the deposition layer 36. In the present application, the deposited layer 36 may meet both of the second preferred embodiment described first preferred embodiment described above and below, may meet only one of the forms. Further, the deposited layer 36 of the present application may also be considered is not satisfied any of the second preferred embodiment described in the first preferred embodiment and the following described.
[0086]
　In deposition layer 36, the transition region defining the adhesion strength between the substrate 41 and the vapor deposition layer 36 such as aluminum oxide deposited film may be formed on the deposition layer 36. If the deposited layer 36 is aluminum oxide deposited film, the transition region, the aluminum hydroxide that is detected by performing etching of the aluminum oxide deposited film using a time-of-flight secondary ion mass spectrometry (TOF-SIMS) metamorphic coupling structure including (Al2O4H). For the aluminum oxide deposited film as defined by performing etching using TOF-SIMS, metamorphic ratio of the transition region defined by the ratio of the transition area is made the displacement defined using TOF-SIMS is preferably is 45% or less. Such forms, by defining the modified rate of the transition region, the adhesion strength between the substrate 41 and the aluminum oxide deposited film is improved, to the knowledge of the identifiable laminate 30 comprising a barrier property it is based.
[0087]
　Specifically described transformer ratio of the transition region. First, the Cs using time-of-flight secondary ion mass spectrometer, etching from the outermost surface of the aluminum oxide deposited film, the element coupling elements coupling and deposited film at the interface between the aluminum oxide deposited film and the plastic base material taking measurement. Subsequently, the measured elements and elemental binding, as shown in FIG. 5, to obtain the respective actual measured graph.
[0088]
　To narrow the transition region of the interface of the plastic substrate and the vapor deposition film of aluminum hydroxide formed in the aluminum oxide deposited film as much as possible, paying attention to AL2O4H, 1) the intensity H of the graph element C6 0 becomes half position ( 5 intensity (intensity) is H 1 to be position), (horizontal axis 5 (Cycle) interface of the plastic base material and aluminum oxide deposited film is T 1 identified as position) of. Also, the interface surface of the aluminum oxide deposited film (the horizontal axis in FIG. 5 (Cycle) is T 0 and to the position of), identified as the aluminum oxide deposited film. Subsequently, 2) peak in the graph representing the element binding AL2O4H (horizontal axis shows 5 (Cycle) is T 2 seek position), to identify from the position of the peak to the position of the interface as a transition region. Subsequently, 3) (in which obtaining the modified rate to aluminum hydroxide of the transition region as an element coupled transition region / aluminum oxide vapor deposited film from the peak to the interface AL2O4H) × 100 (%). In the example shown in FIG. 5, modified ratio is (W2 / W1) × 100 ( %).
[0089]
　Deposition of the aluminum oxide deposited film, to a preferable value transformer ratio of the transition region of the aluminum oxide deposited film, before aluminum oxide deposition process, it is preferable to perform the plasma pretreatment on the surface of the plastic substrate 41 . In plasma pretreatment, the mixing ratio of oxygen gas and argon or helium is supplied as the plasma gas, 5: 1, preferably, 2-to-1. The mixing ratio by a 5-to-1, film formation energy of evaporated aluminum on a plastic substrate is increased, are formed further by a 2-to-1, the formation of aluminum hydroxide in the vicinity of the interface substrate that, i.e. modified rate of the transition region is reduced.
[0090]
　The deposition method for forming a deposited film, can be a physical vapor deposition method, various vapor deposition method from a chemical vapor deposition applied. The physical vapor deposition method, an evaporation method, a sputtering method, an ion plating method, an ion beam assist method, can be selected from the group consisting of a cluster ion beam method, a chemical vapor deposition method, a plasma CVD method, a plasma polymerization method, heat CVD method, can be selected from the group consisting of catalysis-type CVD method. In the present embodiment, deposition of the physical vapor deposition method is preferred.
[0091]
　The thickness of the aluminum oxide deposited film is film formation as described above, preferably at 3nm or more and 50nm or less, preferably 8nm or more and 30nm or less. In this range, it is easy to hold the barrier properties.
[0092]
　[Gas barrier coating film]
　gas barrier coating film 37 is a layer that functions as an inhibiting layer transmission, such as oxygen gas and water vapor. Gas barrier coating film 37 has the general formula R 1 n M (OR 2 ) m (In the formula, R 1 , R 2 represents an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, m represents an integer of 1 or more, n + m is at least one or more alkoxides represented by represents) the valence of M, polyvinyl described above alcohol -. Le system resin and / or an ethylene-vinylalcohol - containing and alcohol copolymer, obtained further, a sol-gel method the catalyst, acid, water, and, in the presence of an organic solvent, a transparent gas barrier composition polycondensation by the sol-gel method It is.
[0093]
　The general formula R 1 n M (OR 2 ) m as alkoxide represented by the partial hydrolyzate of the alkoxide, it can be used at least one kind of condensates of the alkoxide hydrolysis. As the partial hydrolyzate of the alkoxide, it is not necessary for all alkoxyl groups are hydrolyzed, which more than one is hydrolyzed, and may be a mixture thereof. The condensation products of an alkoxide hydrolysis, more than dimer partially hydrolyzed alkoxide is specifically use a 2-6 mers.
[0094]
　The general formula R 1 n M (OR 2 ) m in alkoxide represented by the examples of the metal atom represented by M, it is possible to use silicon, zirconium, titanium, aluminum, and other the like. Preferred metals include, for example, silicon, titanium and the like. Further, in the present invention, the manner of using alkoxides, can also be used alone or as a mixture of alkoxides of two or more different metal atoms in the same solution.
[0095]
　Further, the above-mentioned general formula R 1 n M (OR 2 ) m in alkoxide represented by, R 1 Specific examples of the organic groups represented by, for example, a methyl group, an ethyl group, n- propyl group, i - propyl, n- butyl group, i- butyl group, sec- butyl group, t- butyl group, n- hexyl, n- octyl group, and an alkyl group and other. Further, the above-mentioned general formula R 1 n M (OR 2 ) m in alkoxide represented by, R 2 Specific examples of the organic groups represented by, for example, a methyl group, an ethyl group, n- propyl group, i - propyl, n- butyl group, sec- butyl group, and the like other. Incidentally, the alkyl groups in the same molecule may the be the same or different.
[0096]
　In preparing the above-mentioned transparent gas barrier composition, for example, a silane coupling agent may be added. Examples of the silane coupling agent may be a known organic reactive group-containing organoalkoxysilane. In particular, it organoalkoxysilane having an epoxy group is preferably used, specifically, for example, .gamma.-glycidoxypropyltrimethoxysilane, .gamma.-glycidoxypropylmethyldiethoxysilane or,, beta-(3, , 4-epoxycyclohexyl) ethyltrimethoxysilane can be used. Silane coupling agents as described above may be mixed and used one or two or more.
[0097]
　(Adhesive layer)
　The adhesive layer 45 comprises an adhesive for bonding the first film 40 and sealant film 70. Examples of adhesives, two-component reactive adhesive of the ether, an ester-based two-pack reactive adhesive can be exemplified.
[0098]
　The two-component reactive adhesive of the ether, for example, a polyether polyurethane. Polyether polyurethanes, polyether polyol as the main agent, and an isocyanate compound as a curing agent is a cured product produced by reacting. Examples of the isocyanate compound include tolylene diisocyanate (TDI), 4,4'-diphenylmethane diisocyanate (MDI), an aromatic isocyanate compounds such as xylylene diisocyanate (XDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), etc. the aliphatic isocyanate compound, or can be used an adduct or a multimer of the various isocyanate compounds. Preferably, as a curing agent, using an aromatic isocyanate compound. Thus, as compared with the case of using the aliphatic isocyanate compound, improve the laminate strength between the first film 40 and sealant film 70.
[0099]
　The two-component reactive adhesive of the ester, for example, polyesters and the like polyurethane or polyester. Polyester polyurethane is a cured product and a polyester polyol as a main agent, and an isocyanate compound as a curing agent is produced by reacting. Examples of the isocyanate compounds are the same as those of the above ether-based adhesive.
[0100]
　The adhesive layer 45 is, for example, the adhesive composition is applied to the first film 40 or the sealant film 70, then the adhesive composition is dried and, a main agent and the solvent in the adhesive composition is reacted the adhesive composition is formed by curing Te. The thickness of the adhesive layer 45 is preferably 1μm or more, and more preferably 2μm or more.
[0101]
　(Sealant film)
　sealant film 70 includes at least a sealant layer 71 which constitutes the inner surface 30x of the laminate 30. The material constituting the sealant layer 71, it is possible to use a resin such as polyethylene.
[0102]
　Polyethylene, for example, low density polyethylene based on the density, medium density polyethylene, are classified as high-density polyethylene. The low-density polyethylene, density 0.910 g / cm 3 or more and 0.925 g / cm 3 or less of polyethylene. Medium density polyethylene has a density of 0.926 g / cm 3 or more and 0.940 g / cm 3 or less of polyethylene. The high-density polyethylene, density 0.941 g / cm 3 or more and 0.965 g / cm 3 or less of polyethylene. Low density polyethylene, for example, obtained by polymerizing ethylene at a high pressure of less than 1000 atmospheres and 2000 atmospheres. Medium density polyethylene and high density polyethylene, for example, pressure or within less than 1 atm and 1000 atm is obtained by polymerizing ethylene at a low pressure. Incidentally, medium density polyethylene and high density polyethylene, a copolymer of ethylene and α- olefin may contain partially.
[0103]
　Incidentally, the medium pressure or even when the polymerization of ethylene at low pressure, if it contains a copolymer of ethylene and α- olefin, polyethylene of medium density or low density may be generated. Such polyethylene is referred to as linear low density polyethylene. Linear low density polyethylene, medium-pressure or obtained by introducing short chain branching by copolymerizing α- olefin linear polymer obtained by polymerizing ethylene at a low pressure. Examples of α- olefins, 1-butene (C 4 ), 1- hexene (C 6 ), 4-methylpentene (C 6 ), 1- octene (C 8 ), and the like. The density of the linear low density polyethylene, for example, 0.915 g / cm 3 or more and 0.945 g / cm 3 or less.
[0104]
　The polyethylene constituting the sealant layer 71, low density polyethylene, and the like can be used linear low density polyethylene. Preferably, sealant layer 71 comprises a linear low density polyethylene. This increases the seal strength, it is possible to improve the impact resistance of the bag 10, such as a drop strength. Sealant layer 71 may further comprise a low density polyethylene in addition to the linear low density polyethylene. This can improve the tear resistance of the laminate 30. If the sealant layer 71 comprises both of the linear low density polyethylene and low density polyethylene, high Preferably, than the content of linear low density polyethylene content (wt%) of low-density polyethylene (wt%) . The sealant layer 71 may be a single layer or may be a multilayer.
[0105]
　The thickness of the sealant layer 71 is preferably 80μm or more, and more preferably 120μm or more. The thickness of the sealant layer 71 is preferably not more than 170 [mu] m, more preferably 150μm or less.
[0106]
　 Layer structure of the bottom film
　will be described layer structure of the lower film 16.
[0107]
　As long as having an inner surface and an inner surface and joinable inner surface of the back surface film 15 of the surface film 14, the layer structure of the lower film 16 is arbitrary. For example, like the surface film 14 and the back surface film 15 may be a multilayer body 30 described above as the lower film 16. Or, the inner surface is formed by the sealant layer and the film having a structure different from that of the laminate 30 may be used as the lower film 16. For example, because of tear in the lower film 16 is not required, the content of the low density polyethylene in the sealant layer of the bottom film 16 (wt%), low density polyethylene in the sealant layer 71 of the surface film 14 and the back surface film 15 it may be smaller than the content (% by weight). Or, sealant layer of the bottom film 16 may not comprise a low density polyethylene. The thickness of the sealant layer of the bottom film 16 is, for example, 60μm or more, preferably 80μm or more, more preferably 100μm or more, and still more preferably at least 110 [mu] m.
[0108]
　 Manufacturing method of the first film
　Next, an example of a manufacturing method of the first film 40.
[0109]
　First, a resin material containing a PBT as a main component. Subsequently, by extruding the resin material in the melt extrusion method such as casting method or tubular method, to prepare a film-like substrate 41. Subsequently, by depositing an inorganic material such as aluminum oxide into a film-like substrate 41 may be formed a deposition layer 36. Subsequently, by applying a transparent gas barrier composition onto the deposition layer 36 may be formed gas barrier coating film 37. Thereafter, a print layer 38 on the substrate 41 or on the gas barrier coating film 37. In this manner, comprises a substrate 41, first film 40 and a printing layer 38 or a substrate 41, a gas barrier layer 35 comprising a vapor-deposited layer 36 and the gas barrier coating film 37, and a print layer 38 it is possible to obtain the first film 40.
[0110]
　 Method for producing a laminate
　Next, an example of a method for producing a laminate 30.
[0111]
　First, the first film 40 described above, and prepares a sealant film 70 including the sealant layer 71. Subsequently, by a dry lamination method, stacking the first film 40 and sealant film 70 via the adhesive layer 45. This makes it possible to obtain a laminate 30 comprising a first film 40 and sealant film 70.
[0112]
　In the dry lamination method, first, applying the adhesive composition on one of the two films to be laminated. Subsequently, the dried applied adhesive composition to volatilize the solvent. Then, laminating two films through the adhesive composition after drying. Subsequently, in the wound state two film laminated, aged over 24 hours under example 20 ° C. or higher environment.
[0113]
　 Method for manufacturing a bag
　to prepare the surface film 14 and the back surface film 15 consisting of the laminate 30 described above. Between the surface film 14 and the back film 15, insert the bottom film 16 in the state folded. Subsequently, the inner surfaces of each film was heat sealed to form a seal portion, such as the lower seal portion 12a, side seal portion 13a, the spout seal portion 20a. Further, by cutting the film are joined together by heat sealing to the appropriate shape to obtain a bag 10 shown in FIG.
[0114]
　Subsequently, a plurality of bags 10 of the stacked state turned to a filling device. In the filling apparatus, one by one pulling the bag 10, and transports the bag 10 to the location for filling the contents. Then, filling the contents into the bag 10 through the opening 11b of the upper 11. Thereafter, an upper seal portion upper 11 by heat sealing. Subsequently, the bag 10 with contents is accommodated, by sliding over the conveying path having a surface made of a metal, to discharge the bag 10 from the filling device. In this way, it is possible to obtain a bag 10 in which the contents are sealed is housed.
[0115]
　The following describes advantages of the bag 10 according to this embodiment.
[0116]
　In this embodiment, the laminate 30 constituting the surface film 14 and the back surface film 15 of the bag 10, by comprising a substrate 41 mainly composed of PBT, can be obtained the following effects.
　First, PBT has excellent printability. Thus, polyethylene terephthalate (hereinafter, referred to as PET) as in the case of, it can be provided a printed layer 38 on the substrate 41 including the PBT.
　Also, PBT has a high strength. Therefore, it is possible to laminate constituting the bag 10 is similar to the case of including nylon, increasing the piercing strength of the laminate 30 and the bag 10. Piercing strength of the laminate 30 is preferably at 12N or more, more preferably at least 15N, and even more preferably at least 16N. The piercing strength measuring method is described in Example A1 described below
[0117]
　Also, PBT has a characteristic that it is difficult to absorb water as compared to nylon. Therefore, even when placing the substrate 41 including the PBT to the outer surface 30y of the stack 30, prevents the substrate 41 is the friction coefficient of the outer surface of the bag 10 absorbs the moisture is increased be able to. For example, the coefficient of friction between the outer surface between the bag 10 when was under normal temperature, the difference between the coefficient of friction between the outer surface between the bag 10 after it has been placed under high-temperature and high-humidity environment increases It made it can be suppressed. Thus, it is possible in the filling apparatus, to implement the drawing process and the conveying process of the bag 10 described above efficiently. And the friction coefficient of the outer surface between the temperature 20 ~ 30 ° C. and humidity of 40 to 60 percent of an environment in placed have bag 10 when, after being stored for 48 hours at a high temperature thermostat at a temperature 40 ° C. and 90% humidity the difference between the coefficient of friction between the outer surface between the bag 10 is preferably 0.03 or less.
[0118]
　Further, in this embodiment, by which the laminate 30 includes a gas barrier layer 35 can have a gas barrier property to the first film 40.
[0119]
　Further, according to this embodiment, the sealant layer 71 of the laminate 30 constituting the surface film 14 and the back surface film 15 of the bag 10, including polyethylene resins such as linear low density polyethylene. This increases the seal strength, it is possible to improve the impact resistance of the bag 10, such as a drop strength.
[0120]
　Note that it is possible to make various modifications to the embodiments described above. Hereinafter, with reference to the drawings as needed, a modified example will be described. The following drawings used in the description and the following description, the parts that may be configured similarly to the embodiment described above will be referred to with the same reference numerals as those used for corresponding parts in the embodiment described above, and overlapping description will be omitted. Also, when the effects obtained in the embodiment described above it is clear that also obtained in the modification, it may be omitted from the description.
[0121]
　(Modification of the layer structure)
　in FIG. 2 and FIG. 3 described above, an example in which the print layer 38 provided on the substrate 41, it is not limited thereto, the print layer 38 provided on the substrate 41 not have to be. For example, the first film 40 may be formed of a substrate 41. The first film 40, a base 41, a gas barrier layer 35 provided on the substrate 41 may consist.
[0122]
　Listed example of the arrangement of the layers and is as follows.
　Arrangement example 1: substrate / adhesive layer / sealant layer
　disposed Example 2: substrate / printed layer / adhesive layer / sealant layer
　disposed Example 3: substrate / transparent gas barrier layer / print layer / adhesive layer / sealant layer
　disposed example 4: substrate / transparent gas barrier layer / adhesive layer / sealant layer
[0123]
　 Second Embodiment
　With reference to FIGS. 6 and 7, a description will be given of a second embodiment of the present invention. In the first embodiment described above, the plastic film constituting the substrate of the laminate is an example there is only one. In this embodiment, the plastic film constituting the substrate of the laminate will be described an example in which there are two. In this embodiment, the shape and the same parts of the first embodiment and detailed the same reference numerals description is omitted. Also, when the effects obtained in the first embodiment it is apparent that also obtained in the present embodiment, it may be omitted from the description.
[0124]
　Figure 6 is a sectional view showing an example of the layer structure of the laminate 30 in the second embodiment. 7 is a sectional view showing another example of the layer structure of the multilayer body 30 in the second embodiment. As shown in FIGS. 6 and 7, the laminate 30 includes at least a first film 50, the second film 60 and sealant film 70 in this order. The first film 50 is located on the outer surface 30y side, the sealant film 70 is positioned on the inner surface 30x side opposite the outer surface 30y.

claims

A laminate comprising an outer surface and an inner surface,
　has a plastic film containing 51 mass% or more of polybutylene terephthalate, a base material forming the exterior surface of the laminate,
　the sealant that constitutes the inner surface of the laminate comprising a layer, a
　layer constituting the outer surface of the laminate of the substrate comprises polyethylene terephthalate or polybutylene terephthalate laminate.
[Requested item 2]
　The laminate 2 is prepared, at a high temperature thermostat at a temperature 40 ° C. and 90% humidity is measured after storage for 48 hours, the outer surface of one of the laminate, the coefficient of static friction with respect to the outer surface of the other of the laminate and coefficient of dynamic friction is 0.24 or less, the laminated body according to claim 1.
[Requested item 3]
　The laminate 2 was prepared and measured after storage for at least 24 hours at a temperature 20 ~ 30 ° C. and humidity of 40 to 60 percent of the environment, the outer surface of one of the laminate, the outer surface of the other of the laminate the static and kinetic coefficients of friction referred to as normal temperature static friction coefficient and normal temperature coefficient of dynamic friction, with respect to
　storage for 48 hours after the measurement of the room temperature static friction coefficient and normal temperature dynamic friction coefficient, two of the laminated body at a high temperature thermostat at a temperature 40 ° C. and 90% humidity is measured after, the outer surface of one of the laminate, if the static friction coefficient and dynamic friction coefficient against the outer surface of the other of the laminate referred to as high-temperature and high Shimesei friction coefficient and high temperature and high Shimedo friction coefficient,
　the high temperature and high Shimesei friction coefficient the value obtained by subtracting the normal temperature static friction coefficient is not less than 0.03, and the high temperature and high Shimedo the friction coefficient minus the ambient temperature coefficient of dynamic friction value from Is 0.03 or less, the laminated body according to claim 1 or 2.
[Requested item 4]
　Said plastic film containing 51 mass% or more of polybutylene terephthalate, having a multilayer structure comprising more than 10 layers, the laminate according to any one of claims 1 to 3.
[Requested item 5]
　It said plastic film containing 51 mass% or more of polybutylene terephthalate, consists of a single-layer structure, and, IV values ​​of poly butylene les terephthalate is less than 1.10 dl / g or more and 1.35dl / g, according to claim 1 or laminate according to any one of 3.
[Requested item 6]
　Said substrate has only one said plastic film containing 51 mass% or more of polybutylene terephthalate,
　wherein the sealant layer comprises a linear low density polyethylene, in any one of claims 1 to 5 laminate according.
[Requested item 7]
　The piercing strength of the laminate is 12N or more, the laminated body according to claim 6.
[Requested item 8]
　Further comprising a deposition layer located on a surface of the base material laminate according to claim 6 or 7.
[Requested item 9]
　Further comprising a gas barrier coating film located on the deposition layer laminate according to claim 8.
[Requested item 10]
　The laminate from the outer surface side to the inner surface, a first substrate constituting the outer surface, a second substrate, and the sealant layer constituting the inner surface, at least comprising in this order,
　wherein the first substrate comprises polyethylene terephthalate or 51 wt% or more of polybutylene terephthalate or 51 wt%,
　when the first substrate comprises polyethylene terephthalate or 51 wt%, the second substrate is greater than 51 wt% including polybutylene terephthalate, laminate according to any one of claims 1 to 5.
[Requested item 11]
　Further comprising a deposition layer located on at least one of between the sealant layer or between said second substrate and said second substrate and said first substrate, laminate according to claim 10.
[Requested item 12]
　Further comprising a gas barrier coating film located on the deposition layer laminate of claim 11.
[Requested item 13]
　It said first substrate further comprising a printing layer located between the second substrate, the laminate according to any one of claims 10 to 12.
[Requested item 14]
　The sealant layer comprises a linear low density polyethylene, laminate according to any one of claims 10 to 13.
[Requested item 15]
　The piercing strength of the laminate is not less than 13N, the laminated body according to any one of claims 10 to 14.
[Requested item 16]
　Wherein the first substrate comprises a polybutylene terephthalate,
　the second substrate comprises a polyethylene terephthalate, the laminated body according to any one of claims 10 to 15.
[Requested item 17]
　Wherein the first substrate comprises polyethylene terephthalate,
　the second substrate comprises a polybutylene terephthalate, the laminated body according to any one of claims 10 to 15.
[Requested item 18]
　A bag having a spout portion connected to the main body portion and said body portion,
　and a laminate according to any one of claims 1 to 17,
　and a seal portion that joins the inner surfaces of the laminate, the equipped, bag.