[0001]The present invention, nonwoven manufacturing apparatus, a manufacturing method and a nonwoven nonwoven.
BACKGROUND
[0002]Nonwoven, such as spunbond nonwoven fabric, medical, are widely used in sanitary materials, civil engineering materials and packaging materials and the like. Spunbond nonwoven fabric is cooled process using cooling air of a thermoplastic resin with respect to melt-spun filaments, and after the stretching process using the drawing style, be trapped deposited while diffusing onto the collecting medium It is produced from web obtained in.
[0003]
　The literature 1 (Japanese Patent No. 2556953), is cross section in the horizontal direction rectangular, cooling chamber gradually cross section is reduced in the filament travel direction, Each stepped recess in the wall of the connected outlet in the cooling chamber a stretching nozzle section is formed, and a connected fiber placement machine in the stretching nozzle, apparatus for producing a spun fiber strips from aerodynamically drawn synthetic resin filaments is disclosed. Fiber placement machine of this Document 1 has a rectangular cross section in the horizontal direction, in the longitudinal direction of the Venturi Automobiles annular basin, and has the form of a jet pump having a diffuser outlet, the fiber strips placed filter amount of air sucked from the free air inlet by the intake pipe that is opposed to the diffuser outlet across the belt are to be adjusted.
[0004]
　The literature 2 (Japanese Patent No. 3135498), a nozzle plate having a plurality of nozzles, the processing shaft, has a transport unit and conveyor, the process air to the processing shaft and the transport unit is flowing, the nozzle holes of the nozzle plate member endless fibers are flowed into the processing shaft by the release movement towards the conveyor as air and endless fiber group in the form of a mixture of fibers with the inlet, the transport unit is second only to the center of the inflow conduit and its endless fiber group from , comprising a diffuser conduit extending to the transfer conveyor, releasing motion and fleece forming exercise that overlap with it are forced granted, spin fleece from thermoplastic endless fibers above both conduits extending in a direction transverse to the running direction of the conveyor belt apparatus for manufacturing a web are disclosed. This document 2, inlet conduit and / or a diffuser duct is used for the mixing of air and fibers, distribution slit for additionally injecting air into the conduit that extends across the running direction of the conveyor belt across the width of the conduit shape, and comprises a aerodynamic histological like dispensing device in the form of outflow slit for discharging air from the conduit, the mixing the flow of air to be flow rate and outflow to be additionally feeding an additional supply of air and fibers It is to be controlled or adjusted in order to affect the equal distribution of the fibers in. Further, Patent Document 2, the inner surface of the inlet conduit and / or a diffuser conduit comprises a baffle member in the vicinity of the surface of the conduit longitudinal section, spiral region is formed in the rear with respect to the flow direction.
[0005]
　Document 3 (Japanese Patent No. 5094588), as a device for producing a spunbond formed of filaments, the spinneret to form a filament is provided, cooling supplies process air to cool the filaments downstream of the spinneret There is room, stretching unit for stretching the filaments is connected to the cooling chamber, the connection area between the drawing unit and the cooling chamber is closed, stretching unit passage walls on at least a portion of the length of the stretching path has a draw passage is branched into, a stretching unit, additional air at the upstream end of the branch extending passage portion is injected into the stretching path by conditions widely form filament bundles in the machine direction, the spunbond web filaments It describes a device provided with deposition apparatus for depositing. Moreover, the literature 3, the downstream drawing unit has a deposition unit, deposition unit comprises an upstream diffuser from adjacent the downstream diffuser, there is described that the ambient air inlet slit is provided between the upstream diffuser and downstream diffuser .
Summary of the Invention
Problems that the Invention is to Solve
[0006]
　Meanwhile, as an important characteristic relating to the quality of the nonwoven fabric, there is uniformity and intensity. For example, in Document 2, although intended to mesh size to obtain a uniform nonwoven fabric, a highly uniform nonwoven entanglement of the filaments is insufficient, strength may be decreased.
[0007]
　The present invention has been made in view of the aforementioned, nonwoven manufacturing apparatus is achieved improvement in the uniformity while suppressing a decrease strength of the nonwoven fabric, and an object thereof is to provide a nonwoven fabric manufacturing method and nonwovens.
Means for Solving the Problems
[0008]
　The specific means for achieving the above object, includes the following aspects.
　The first aspect includes a collector for collecting filaments ejected toward the collecting media on the collection medium, wherein the air supplied capturing with said filaments are collected in the collection medium the main nozzle ejects toward the collecting media, and provided between the main nozzle and the collecting medium, air jetted from the main nozzle with the filaments the filaments are spread by a gas stream flowing through while diffusing is apparatus for manufacturing a nonwoven fabric comprising a diffusion portion comprising a diffusion space, and a air flow generating means for creating an air flow along in close proximity to the airflow around the airflow jetted the air in the diffusion space from the main nozzle .
[0009]
　The second aspect is, between the collection medium air with filament collecting filaments ejected from the main nozzle and a main nozzle for ejecting air ejected from the main nozzle is diffused with the filament by a gas stream flowing while providing a diffusion space in which the filaments are spread, while causing an air flow along in close proximity to the airflow around the air stream that is injected into the diffusion space from the main nozzle by air flow generating means, and said filament is ejected toward the collection medium together with air from the main nozzle, collecting depositing the filaments spread by the diffusion space on the collection medium is the method for producing a nonwoven fabric comprising .
[0010]
　In the first aspect and the second aspect, by spinning filaments from the molten resin, spinning unit that derives a plurality of filaments (spun step), cooling wind a plurality of filaments is introduced from the spinning unit cooling section (cooling step), stretching unit for stretching by stretching air cooling a plurality of filaments were (stretching step), and the drawn plurality of filaments was then collected deposited collecting unit that generates a web cooled by ( includes absorption step), the nonwoven fabric is produced from the collected web. The manufacturing apparatus includes a plurality of diffusing portion for ejecting toward the collecting portion while diffusing the filaments (diffusion process) to be introduced from the stretching unit.
[0011]
　Diffusion portion includes a diffusion space drip provided between the main nozzle and the main nozzle and the collection portion of the collection medium. Diffusion space in the first and second aspects, it is preferred airflow by the air ejected from the main nozzle is a space where a natural diffusible without disturbing the diffusion. Diffusion space may be surrounded by the partition, but if surrounding by the partition, the partition wall so as not to affect the air flow by the air ejected from the main nozzle may be provided away from the air stream. Further, the filaments, a plurality are arranged along the machine width direction, the main nozzle has a long slit shape along the machine width direction.
[0012]
　Accordingly, the air ejected from the main nozzle, the air flow (jet flow) flowing to gradually spread while collecting medium along a machine direction in the diffusion space. A plurality of filaments ejected from the main nozzle with air, the filaments are collected in the collecting medium is diffused in the machine direction by a gas stream which is formed in the diffusion space.
[0013]
　Here, the spreading unit, air flow generating means is provided, at the periphery of the airflow due to the ejected air from the main nozzle by air flow generating means airflow along in proximity to the gas stream is generated, in close proximity to the air flow of the main nozzles entering into the airflow by the air diffusion space by a gas stream along Te (air) is ejected from the main nozzle with a plurality of filaments air is suppressed. Air stream jetted from the main nozzle is velocity fluctuation therein occurs, the area which the air velocity fluctuation by enters is larger than the circumference of the diffusion space occurs. In contrast, by causing an air flow along in close proximity to the airflow around the airflow by the air ejected from the main nozzle, air that air diffusion space from entering the air stream by being jetted from the main nozzle is suppressed, the flow rate variation is narrowed is larger region than the surrounding, or velocity fluctuation is the magnitude of the velocity fluctuation in the larger region than the surrounding is prevented.
[0014]
　Each of the filaments, by regions velocity fluctuation is greater than the ambient occurs, entanglement filaments greater the velocity variations in the area is increased, but a bundle of filaments is reduced uniformity occurs , improvement of uniformity occurrence of bundles of filaments is suppressed by the size of the velocity fluctuation is suppressed is achieved.
[0015]
　The third aspect is the air flow generating means preferably includes a sub-nozzle for jetting air to the diffusion space. The fourth aspect is the air flow generating means comprises a sub-nozzle for jetting air are disposed opening aligned with the opening of the main nozzle into the diffusion space.
[0016]
　In a third aspect and fourth aspect, includes a sub-nozzle openings are arranged alongside the opening of the main nozzle, the air ejected from the secondary nozzle, said at ambient airflow by the air jetted from the main nozzle causing an air flow along in close proximity to the air flow.
[0017]
　Accordingly, since it is inhibited from entering the air flow by the air of the air diffusion space is ejected from the main nozzle, is easily improved uniformity of the nonwoven is achieved.
[0018]
　The fifth embodiment is characterized in that, in the third and fourth aspects of the sub-nozzle is provided on the side opposite to the machine direction side and the machine direction of the main nozzle.
[0019]
　In a fifth aspect, it has a sub-nozzle is provided on each of the opposite side to the machine direction side and the machine direction relative to the main nozzle. Accordingly, the air within the diffusion space, to the air of the air flow jetted from the main nozzle, the machine direction side and the machine direction since entering from each opposite side is suppressed, ejected from the main nozzle the air velocity fluctuation increases can be effectively suppressed.
[0020]
　A sixth aspect, in any one of the fifth aspect of the third embodiment, the flow rate of the air ejected from the secondary nozzle may be less than or equal to the air flow rate ejected from the main nozzle. Also, seventh aspect, in the sixth aspect, it is more preferred the at air flow rate ejected from the secondary nozzle than 1/10 of the air flow rate ejected from the main nozzle.
[0021]
　Each of the seventh aspect of the first aspect, as a non-woven fabric improved uniformity is achieved while suppressing reduction in strength, elongation of 5% in the machine direction with respect to strength at 5% elongation in the machine direction and the direction perpendicular is suitable for obtaining a nonwoven fabric ratio of the intensity is 2.0 or less when.
　Each of the seventh aspect of the first embodiment is suitable for the production of non-woven fabric is the largest strength at elongation in the machine direction 35.0 (N / 25mm) or more. Also, each of the seventh aspect of the first embodiment, the maximum strength at elongation in the machine direction of the nonwoven fabric to be manufactured is more preferably 37.5 (N / 25mm) or more, more preferably 40 a .0 (N / 25mm), and most preferably from 42.5 (N / 25mm).
　Furthermore, each of the seventh aspect of the first aspect, the basis weight variation (%) is preferably not more than 3.0%, is suitable for the production of nonwovens and more preferably 2.5% or less.
Effect of the invention
[0022]
　According to embodiments herein, non-woven fabric improved uniformity while suppressing strength reduction has been achieved is obtained, there is an effect that.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023]
FIG. 1 is a schematic diagram of a manufacturing apparatus according to this embodiment.
Is a schematic diagram illustrating a FIG. 2 spreading section.
It is a distribution diagram of an example of FIG. 3A] simulation results of velocity fluctuation in the present embodiment.
Is a distribution diagram of an example of FIG. 3B] Simulation of velocity fluctuation in the comparative example results.
4 is a chart showing a comparison of production conditions and physical properties according to the embodiment.
DESCRIPTION OF THE INVENTION
[0024]
　Will be described in detail an embodiment of the present invention with reference to the drawings. FIG 1 shows a main part of the manufacturing apparatus 10 of the nonwoven fabric according to the present embodiment. Manufacturing apparatus 10 according to the present embodiment is used in the manufacture of spunbonded nonwoven fabric. In the following description, MD (machine direction) direction indicates the machine direction (the machine flow direction), UP direction shows the upper vertical direction. In the following description, it referred to as a direction perpendicular to each of the MD direction and the UP direction (machine direction perpendicular to the direction) of the CD (cross machine direction) direction (machine width direction. Not shown).
[0025]
　Manufacturing apparatus 10 is out section 12, cooling section 14 for cooling processing for the spun filaments thermoplastic resin used in the spunbond nonwoven fabric to produce filaments by spinning molten molten resin, and to the filament comprising a stretching unit 16 for stretching Te. The manufacturing apparatus 10 is to collect the cooling process and the stretching filaments are ejected so as to spread a plurality of filaments toward the collector 18, and the collecting unit 18 to obtain a web of a nonwoven fabric comprising a spreading section 20.
[0026]
　Spinning unit 12 includes a spinneret 22 having a plurality of spinning nozzles are arranged, the molten resin introducing pipe 24 is connected to a spinneret 22. Out section 12, the molten resin introduced into the spinneret 22 through a molten resin introducing pipe 24 is spun by spinning nozzles to produce a filament. Further, out section 12, the spinneret 22 by a plurality of spinning nozzles, to derive a plurality of filaments arranged in the CD direction. Cooling unit 14 is provided with a cooling chamber 26 in which a plurality of filaments spun is introduced, the cooling air supply duct 28 is connected to the cooling chamber 26. Cooling unit 14, the air supplied from the cooling air supply duct 28 and the cooling air, a plurality of filaments is introduced into the cooling chamber 26 is cooled by the cooling air.
[0027]
　Stretching unit 16 (in FIG. 1, the paper front and back direction) opening cross section CD direction comprises stretching shaft 30 extending in the vertical direction is shorter narrow width longer MD direction. Stretching section 16, the stretching shaft 30 is connected to the cooling chamber 26, a plurality of filaments is introduced into the stretching shaft 30 from the cooling chamber 26. Deriving stretching unit 16, the air from the cooling air or cooling air is introduced along with a plurality of filaments to be supplied separately from the stretching shaft 30 and stretched wind, while stretching the filaments introduced from the cooling unit 14 by stretching wind to.
[0028]
　Collecting section 18 is provided with suction means (not shown) provided below the transfer zone 32, and transporting zone 32 of the collection medium which is formed by a mesh or a punching metal. The diffusion unit 20, ejected toward the air to be introduced separately from the stretching air or drawing air is introduced from the stretching shaft 30 to the transfer zone 32 of the collecting portion 18. Collecting portion 18, a plurality of filaments ejected and collected on a collecting surface 32A of the transfer zone 32 by suction by the suction means, to produce a web of non-woven fabric. Incidentally, out section 12 of the manufacturing apparatus 10, the cooling unit 14, a stretching unit 16, and the collecting unit 18, the cooling stretch processing of a plurality of filaments generation of multiple filaments were produced by spinning a molten resin, and It may apply a known configuration for collecting the plurality of filaments.
[0029]
　FIG. 2 shows a schematic configuration of the diffusion unit 20 according to this embodiment. Spreading section 20 is provided with a jetting nozzle 34 as a main nozzle. Ejection nozzle 34, the opening 34A of the tip of the opening serving as ejection port is directed onto the moving band 32 long formed in a slit shape collecting part 18 in the CD direction. Also, the jetting nozzle 34 is continuously in the stretching shaft 30 of the extending portion 16, a plurality of filaments that are cooled stretched is introduced. The diffusion unit 20, air separately is introduced from the air or stretching style air by stretching air to the jetting nozzle 34.
[0030]
　Spreading unit 20, an air and a plurality of filaments is introduced into the jet nozzle 34 is ejected toward the opening 34A onto transfer zone 32 of the collecting portion 18. Spreading unit 20, the air stream ejected from the ejection nozzle 34, and sends towards a plurality of filaments that are ejected from the ejection nozzle 34 to the collector 18. Hereinafter, the air flow generated by the air ejected with a plurality of filaments from the ejection nozzle 34 of the transport stream.
[0031]
　The spreading unit 20, between the ejection nozzle 34 and the collection surface 32A of the transfer zone 32 of the collecting portion 18, diffusion space 36 is provided, the delivery flow toward the inside diffusion space 36 to the transfer zone 32 flowing Te. Diffusion space 36, a wall surface or the like for regulating the flow of the carrier stream is a space not provided by the air ejected from the ejection nozzle 34. That is, the diffusion space 36 is a space which transport stream to be ejected from the ejection nozzle 34 is not affected by structures such as walls other than collecting unit 18. The diffusion space be provided so as partition walls do not interfere with the flow of the air stream may be partitioned by a partition wall.
[0032]
　Thus, the spreading section 20, in the diffusion space 36, it flows while spreading gradually (naturally) to the opposite direction of the conveying flow is MD and MD directions by the air ejected from the ejection nozzle 34. The transport stream, the flow rate gradually decreases as approaching to the transfer zone 32. A plurality of filaments that are ejected from the ejection nozzle 34, by delivery flow spreads in the diffusion space 36, the filaments are spread in the opposite direction to the MD direction and the MD direction. Thus, the manufacturing apparatus 10, the filament is collected is diffused in the collection region that is predetermined on the collecting surface 32A of the transfer zone 32.
[0033]
　The manufacturing apparatus 10, the nonwoven fabric to produce the nonwoven manufacturing speed, filaments depending on the width in the CD direction of the web that is produced is collected by the collecting unit 18, the opening width of the jet nozzle 34, opening length, spacing, etc. of the moving speed of the transfer zone 32, and the ejection nozzle 34 and the collection surface 32A of the transfer zone 32 are defined. The spreading unit 20, the distance between the tip and the surface of the transfer zone 32 of the collecting portion 18 of the ejection nozzle 34 (height H) is, 0.1 m or more, has been defined between less than 1 m, the distance H There has been a height of diffusion space 36.
[0034]
　The manufacturing apparatus 10, the air volume per air unit of time to a flow rate or burst of air to be ejected from the ejection nozzle 34 is determined, in the following, the flow velocity Vm of the conveying flow the air flow velocity at the opening of the jet nozzle 34 referred to as. The spreading section 20, the spread of the conveying flow in the diffusion space 36 varies depending on the flow velocity Vm, if the flow velocity Vm is high, the spread of the transport stream is less than lower.
[0035]
　Spreading unit 20, the transport stream is diffusion space 36 is ejected from the ejection nozzle 34 by being provided with mainly gradually spread while reaching over the moving belt 32 along the MD direction. In the following description, the area of ​​the delivery flow in the diffusion space 36 of the transport basin 38. FIG. 2 shows a conveying basin 38 virtually.
[0036]
　As shown in FIGS. 1 and 2, the spreading section 20, the sub nozzle 40 is provided as air flow generating means. Sub nozzle 40 is long slit-shaped opening 40A in the CD direction is provided as an opening. Spreading section 20, the MD direction side and the MD direction of the ejection nozzle 34 auxiliary nozzle 40 is arranged on each of the opposite side, an aperture 40A of the auxiliary nozzle 40 is aligned with the opening 34A of the ejection nozzle 34.
[0037]
　The secondary nozzle 40, the air supply pipe 42 is connected, for ejecting air supplied via the air supply pipe 42 from the opening 40A. Spreading section 20, the sub nozzle 40 through the air supply pipe 42 so that the flow velocity Vs which is determined according to the flow velocity Vm of the transport stream airflow is ejected from the ejection nozzle 34 by the air ejected from the sub nozzle 40 air is controlled to be supplied to. The spreading section 20, the sub-nozzles 40 as injection direction of the air is substantially parallel to the injection direction of the air from the ejection nozzle 34 is provided. Here, a flow rate Vs is preferably less velocity Vm (Vs ≦ Vm), and more preferably 1/10 or more velocity Vm (Vs ≧ (Vm / 10). From here, the diffusion section 20 , air supply to the sub nozzle 40 so as to be 1/2 the velocity Vs of the velocity Vm (Vs = Vm / 2) is controlled.
[0038]
　In the present embodiment, are arranged side by side and the opening 40A of the aperture 34A and the sub nozzle 40 of the jet nozzle 34 is not limited to this, one opening 40A of the aperture 34A and the sub nozzle 40 of the jet nozzle 34 There may be disposed with a step away from the collection surface 32A of the transfer zone 32 than the other.
[0039]
　Thus, as shown in FIG. 2, the spreading unit 20, so the air flow along in proximity to the delivery flow around the delivery flow in the diffusion space 36 by the air ejected from the secondary nozzle 40 (conveying basin 38) occurs ing. In FIG. 2, virtually it shows the air flow generated by the air jetted from the secondary nozzle 40 as a stream layer 44.
[0040]
　This and that manufacturing apparatus 10 thus constructed, a plurality of filaments that are spun cooling process and drawing process from the molten resin is introduced into the ejection nozzle 34 of the spreading unit 20. Further, the ejection nozzle 34, the air for generating a transport flow (air supplied separately from the air or drawing air drawn air) is introduced.
[0041]
　The spreading unit 20, diffusion space 36 is provided between the ejection nozzle 34 and the transfer zone 32 of the collecting portion 18, the air and a plurality of filaments that are introduced into the jet nozzle 34, opening of the ejection nozzle 34 It is ejected toward the diffusion space 36 from 34A. Thus, a plurality of filaments are collected on a collecting surface 32A is blown into the transfer zone 32 above the collecting portion 18 while being diffused by the transport stream by the air ejected from the ejection nozzle 34.
[0042]
　Meanwhile, the spreading section 20, the sub nozzle 40 is provided with ejection nozzles 34, ejecting the air auxiliary nozzle 40 is supplied through the air supply pipe 42 into the diffusion space 36. Thus, the diffusion space 36, air flow along in proximity to the delivery flow around the delivery flow occurs, the air in the diffusion space 36 from entering into the conveying stream (in the transport basin 38) is suppressed.
[0043]
　A plurality of filaments which are conveyed in diffusion space 36 by the transport stream, although variations in the flow rate occurs within the transport stream, in the region velocity fluctuation is greater than ambient, many entangled large throat filament greater the velocity fluctuation Become. Thus, nonwoven filament is obtained from the web produced is collected, the tensile strength becomes higher. However, in the collected web, the entanglement of the filaments is increased, the uniformity of the nonwoven fabric is lowered.
[0044]
　In contrast, the diffusion unit 20 to the sub-nozzles 40 is provided, air flow along in proximity to the delivery flow around the delivery flow by the air jetted from the secondary nozzle 40 is formed, resulting in the interior of the delivery flow in large areas of the velocity fluctuation, the magnitude of the velocity fluctuation can be suppressed. Thus, the collected web in the absorption section 18, is inhibited from entanglement of the filaments is increased, improving the uniformity was achieved nonwoven is obtained.
[0045]
　Here, FIG. 3A and 3B, illustrates the simulation result of the velocity fluctuation of the air flow in the diffusion space 36 (speed change) by the distribution of velocity fluctuation. Figure 3A is a sub nozzle embodiment in which a jet nozzle 34 and the sub-nozzles 40 (below, Example 1) corresponding to the spreading unit 20 of Figure 3B, to comparison example (below, Comparative Example 1) It shows the spreading unit 20A that only jetting nozzle 34 without providing the 40.
[0046]
　In the simulation of the velocity fluctuation, the diffusion unit 20,20A is the air flow rate to be ejected from the ejection nozzle 34 to the same flow velocity Vm, The diffusion unit 20, the air ejected from the sub nozzle 40 the flow velocity Vs of velocity Vm 1/2 (Vs = Vm / 2) and then is set so as to eject the air injection direction parallel to the air from the ejection nozzle 34. Further, the flow rate variation determines the velocity difference in the flow rate of each sampling time from the flow rate of each sampling time set in advance, the root mean square of the speed difference obtained: is used (root mean square RMS).
[0047]
　The spreading unit 20A of the comparative example shown in FIG. 3B, the internal velocity fluctuation in the air flow is occurring is extremely large area as compared with the periphery that is ejected from the ejection nozzle 34. By such a velocity fluctuation is extremely large area occurs, nonwovens, but tensile strength is improved, the mesh eyes of uniformity is formed by a filament is lowered.
[0048]
　In contrast, in the diffusion section 20 of the first embodiment shown in FIG. 3A, and the size of the velocity fluctuation is suppressed in a large area within the velocity fluctuation of the air flow ejected from the ejection nozzle 34 as compared to the spreading unit 20A there. Thereby, the diffusion section 20, entanglement of the filaments in the web that is collected in the collecting portion 18 is suppressed from spreading section 20A.
[0049]
　Therefore, the manufacturing apparatus 10 which the sub nozzles 40 are provided in the diffuser portion 20, uniformity than when the sub nozzle 40 is not provided is improved nonwoven is obtained. Further, the spreading unit 20 of the present embodiment, since there remains a large area of ​​the velocity fluctuation than ambient into the transport stream, lowering of the tensile strength of the nonwoven fabric is suppressed.
[0050]
　In the above in the present embodiment described with respect to the flow velocity Vm of the ejection nozzle 34, but the flow velocity Vs of the sub-nozzles 40 was set to 1/2, the present invention is not limited thereto. Velocity Vs of the sub-nozzles 40 may be any less velocity Vm of the jet nozzle 34, thereby, without inhibiting the spread of transport streams in the diffusion space 36, it is possible to suppress the velocity fluctuation in the transport stream it can.
[0051]
　Further, the flow velocity Vs of the sub-nozzles 40 may be greater than the flow velocity Vm of the ejection nozzle 34 (Vs> Vm). In this case, the ejection direction of the air from the sub nozzle 40, when made to be the injection direction of the air from the ejection nozzle 34 and substantially parallel, the air ejected from the secondary nozzle 40, the spread of the transport flow in the diffusion space 36 there is a possibility that regulates. From here, the air if the velocity Vs of the sub-nozzles 40 be greater than the flow velocity Vm of the ejection nozzle 34 (Vs> Vm), the sub nozzle 40 is ejected orientation or air opening 40A is ejected from the ejection nozzle 34 the direction along the conveying flow around the conveying flow by, i.e., may be such that the direction of flow against the flow of the carrier flow.
[0052]
　Further, in the present embodiment, the sub-nozzles 40 with respect to the jetting nozzle 34 and the MD direction side and the MD direction is provided in the opposite direction, the sub nozzle 40, the auxiliary nozzle 40 with respect to the jetting nozzle 34 MD it may be provided in the opposite direction side of the direction or MD direction. That is, the sub-nozzles 40 may be any one provided on at least one of the opposite direction is a sub-nozzle 40 against the ejection nozzle 34 and the MD direction side and the MD direction.
[0053]
　Further, in this embodiment, although the sub-nozzles 40 provided as air flow generating means, the air flow generating means is not limited to the sub-nozzles 40, create a flow of air flow along in close proximity to the delivery flow around the delivery flow it may be used as long as.
Example
[0054]
　Hereinafter, more detailed explanation of the present invention through examples. The present invention is not limited to these examples.
　This embodiment (hereinafter, referred to as Example 1) comparative example for the form of and the embodiment (hereinafter, referred to as Comparative Example 1) physical properties in the were measured by the following method.
[0055]
　(1. basis weight [g / m 2 ])
　was a test piece of 100 mm (MD) × 100 mm (CD) of a non-woven fabric was taken five points. Incidentally, sampling location of the test piece (sampling position) is set to any five locations.
　Then, by using the upper tray electronic balance (KenTadashi Kogyo Co., Ltd.) for each test pieces taken, the mass of each test piece was measured to determine the average of the weight of each specimen. From the mean values obtained 1 m 2 in terms of mass [g] per, the second decimal point basis weight of each specimen sample was rounded to 2 decimal places [g / m 2 was].
[0056]
　(2 basis weight variation [%])
　was a test piece of 50 mm (MD) × 50 mm (CD) from the nonwoven fabric was taken 100 points. It should be noted that, taken place, the 10 locations in the width direction of the nonwoven fabric (CD), was 10 times in the flow direction (MD).
　Then, by using the upper tray electronic balance (KenTadashi Kogyo Co., Ltd.) for each test pieces taken, each mass [g] was measured to determine the mean value and standard deviation of the mass of each test piece. The value obtained by dividing the standard deviation by the average value was basis weight variation in the nonwoven sample (%).
[0057]
　(3. Fiber diameter [μm])
　and the test piece of 10 mm (MD) × 10 mm (CD) of a non-woven fabric was taken five points. It should be noted that, taken place, and with any one place.
　Then, the test piece using an optical microscope, and photographed at a magnification of 200 times, an image size measurement software captured image (Innotech Corporation: Pixs2000 Version2.0) were analyzed by. The fiber diameter of ten measured for each test piece, the fiber径N average value of each specimen was determined and the fiber diameter of each nonwoven fabric sample by rounding to one decimal place [μm].
[0058]
　(4. nonwoven fiber bundle [the point])
　were collected one point of the test piece 250mm from nonwoven (MD) × 200 mm (CD). It should be noted that, taken place, and with any one place.
　Then, the nonwoven fabric was visually confirmed, two or more fibers counts the number of points (bristles) are entangled in a bundle, and evaluated according to the following criteria.
A: yarn bundle is 0 points
B: fiber bundle is less than 20 or more places one location
C: fiber bundle is more than 20 locations
[0059]
　(5.MD5% strength and MD strength [N / 25 mm])
　of the MD test piece 25mm (CD) × 200 (MD ) of a non-woven fabric was taken each 5 points. It should be noted that, taken place, and with any of the five locations.
　Then, each specimen collected, universal tensile tester (Intesco Co., IM-201 type) using a chuck interval 100 mm, and extended by pulling under the conditions of a tensile speed 100 mm / min, distance between chucks and a 105mm load [N] at the time became, and to measure the maximum load [N]. The respective mean values of each specimen was determined and the MD5% strength [N / 25 mm] and MD strength of each nonwoven fabric sample by rounding to one decimal place [N / 25 mm]. MD5% strength corresponds to the strength at 5% elongation in the machine direction, MD strength corresponds to the maximum strength at elongation in the machine direction.
[0060]
　(6.CD5% strength and CD strength [N / 25 mm])
　a CD test piece of 25mm (MD) × 200mm (CD ) of a non-woven fabric was taken each 5 points. It should be noted that, taken place, and with any of the five locations.
　Then, each specimen collected, universal tensile tester (Intesco Co., IM-201 type) using a chuck interval 100 mm, and extended by pulling under the conditions of a tensile speed 100 mm / min, distance between chucks and a 105mm load [N] at the time became, and to measure the maximum load [N]. The respective mean values of each specimen was determined and the CD5% strength [N / 25 mm] and CD strength of each nonwoven fabric sample by rounding to one decimal place [N / 25 mm]. CD5% strength corresponds to the strength at 5% elongation in the machine direction and the direction perpendicular, CD strength corresponds to the maximum strength at elongation in the machine direction and perpendicular.
[0061]
　(Example 1)
　As the first propylene polymer, the melting point 162 ° C, MFR (conforming to ASTM D1238, temperature 230 ° C, measured with a load 2.16 kg, the same applies hereinafter) 60 g / 10 min propylene homo- using coalescence. The second propylene polymer, the melting point 142 ° C, MFR60g / 10 min, the ethylene unit component content of 4.0 mole% of propylene-ethylene random copolymer was used. Using a first propylene polymer and a second propylene polymer, subjected to composite melt spinning by spun bond method, a core portion propylene homopolymer, the sheath portion is propylene-ethylene random copolymer ( the core / sheath = 20/80 eccentric core-sheath composite long fibers (weight ratio)) as a fiber (filament).
[0062]
　The resulting fibers are dispersed from the main nozzle shown in FIG. 1 (ejection nozzle 34), and the volume on the collecting medium (transfer zone 32). At this time, the speed of the air ejected from the ejection nozzle 34 (main nozzles) is 107.3m / sec, the sub from the ejection port of the ejection nozzle 34 (openings 34A) provided at a position apart 38mm in the horizontal direction the air ejected from nozzle 40 (ejection width 12 mm), and a 1/4 (26.8m / sec) relative to the speed of the air ejected from the ejection nozzle 34.
[0063]
　Thereafter, it is detached from the collection medium, 6.7% embossed pattern area ratio, the embossed area 0.19 m 2 is, heating temperature 130 ° C, and thermal bonding with heated embossing conditions linear pressure 60 kg / cm, to obtain a spunbond non-woven fabric. Basis weight of the resulting spunbonded nonwoven fabric 20.0 g / m 2 was. The obtained spunbonded nonwoven fabric was evaluated by the method described above. The evaluation results are shown in FIG.
[0064]
　(Comparative Example 1)
　except that the air jetted from the sub nozzle 40 was set to 0 (velocity 0 m / sec), to obtain a spunbonded nonwoven fabric in the same manner as in Example 1. Basis weight of the resulting spunbonded nonwoven fabric 20.2 g / m 2 was. The obtained spunbonded nonwoven fabric was evaluated by the method described above. The evaluation results are shown in FIG.
[0065]
　Here, the basis weight variation, whereas Comparative Example 1 was 3.5 [%] Example 1 was 2.0 [%]. The evaluation of the yarn bundle in the nonwoven [point], compared to Example 1 was evaluated B, Comparative Example 1 had a rating C. At this time, MD5% strength, Example 1 is 4.3 [N / 25 mm], Comparative Example 1 is 5.2 [N / 25 mm], CD5% strength, Example 1 is 2.7 [N / 25mm] Comparative example 1 was 1.2 [N / 25mm]. Further, MD5% strength / CD5% strength, Example 1 whereas was 1.6, Comparative Example 1 was 4.3. Here, Example 1 compared to Comparative Example 1, it can be seen that the strength reduction is suppressed and uniformity is improved.
[0066]
　Therefore, a method of manufacturing apparatus and nonwoven according to the present embodiment, strength reduction is suppressed and uniformity is suitable for producing improved nonwoven. The method of the manufacturing apparatus and nonwoven according to the present embodiment, the machine direction perpendicular to the direction (CD direction) in the machine direction (MD direction) with respect to the strength at 5% elongation (CD5% strength) 5% elongation the ratio of the intensity when (MD5% strength) (MD5% strength / CD5% strength) is suitable for the production of non-woven fabric is 2.0 or less.
[0067]
　Furthermore, a method of manufacturing apparatus and nonwovens in the present embodiment, the basis weight is preferably dispersion 3.0 (%) or less, and more preferably suitable for the production of 2.5 [%] or less of the nonwoven fabric.
　The method of the manufacturing apparatus and the nonwoven fabric of the present embodiment, the maximum strength at elongation in the machine direction (MD strength) 37.5 [N / 25 mm] or more, more preferably, more preferably 40.0 [N / 25mm], most preferably suitable for the production of non-woven fabric is 42.5 [N / 25mm].
[0068]
　The disclosure of Japanese Patent Application No. 2016-020144 in its entirety is incorporated herein by reference.
　All documents described herein, patent applications, and technical standards, each individual publication, patent applications, and to the same extent as if it is marked specifically and individually incorporated by techniques standard reference, It incorporated by reference herein.

WE CLAIM

A collecting unit for collecting the filaments ejected toward the collecting media on the collection medium,
　toward the air supplied together with the filaments are collected in the collection medium to the collecting medium ejection the main nozzle and the main nozzle and is disposed between the collecting medium, spreading section air ejected from the main nozzle with the filament comprises a diffusion space in which the filaments by a gas stream flowing through while diffusing is diffused to When,
　the air flow generating means for creating an air flow along in close proximity to the airflow around the air stream that is injected into the diffusion space from the main nozzle
　nonwoven manufacturing apparatus including a.
[Requested item 2]
　It said air flow generating means, non-woven fabric manufacturing apparatus according to claim 1, further comprising a sub-nozzle for jetting air into the diffusion space.
[Requested item 3]
　It said air flow generating means, non-woven fabric manufacturing apparatus according to claim 1 or claim 2 wherein comprises a sub-nozzle for jetting air opening is arranged alongside the opening of the main nozzle into the diffusion space.
[Requested item 4]
　The auxiliary nozzle nonwoven manufacturing apparatus according to claim 2 or claim 3, wherein provided on the opposite side to the machine direction side and the machine direction of the main nozzle.
[Requested item 5]
　The air flow rate nonwoven manufacturing apparatus according to any one of the preceding claims 2 is a flow rate of air below ejected from the main nozzle ejected from the secondary nozzle.
[Requested item 6]
　The nonwoven fabric manufacturing apparatus of 1/10 or more of claims 5, wherein the air flow rate air flow rate ejected from the secondary nozzle is ejected from the main nozzle.
[Requested item 7]
　Between the collecting medium air with filament collecting filaments ejected from the main nozzle and the main nozzles ejected, the filament by a gas stream flowing with the air is diffused ejected from the main nozzle with the filament There is provided a diffusion space to be spread,
　while causing an air flow along in close proximity to the airflow around the air stream that is injected into the diffusion space from the main nozzle by air flow generating means,
　together with the air from the main nozzle said filament is ejected toward the collection medium,
　the collecting depositing the filaments spread by the diffusion space on the collection medium,
　the method for producing non-woven fabric comprising the.
[Requested item 8]
　And jetted from the secondary nozzle opening is disposed an air into the diffusion space alongside the opening of the main nozzle, close to the airflow around the air stream that is injected into the diffusion space from the main nozzle the method of claim 7, wherein the nonwoven fabric comprises causing air flow and along with.
[Requested item 9]
　The method for producing a nonwoven fabric according to claim 8, characterized in that provided on the opposite side of the sub-nozzle and the machine direction and the machine direction of the main nozzle.
[Requested item 10]
　The method for producing a non-woven fabric of the air flow velocity follows to have claim 8 or claim 9, wherein the ejected flow rate of air from the main nozzle ejected from the secondary nozzle.
[Requested item 11]
　The method for producing a nonwoven fabric as a 1/10 or more and claim 10, wherein the air flow rate ejected the flow rate of air from the main nozzle ejected from the secondary nozzle.
[Requested item 12]
　Machine direction elongation of 5% of the strength and the machine direction and the direction perpendicular to the 5% ratio of the strength at elongation of 2.0 or less is a nonwoven fabric.
[Requested item 13]
　Maximum strength at elongation in the machine direction 35.0 (N / 25mm) or more in a claim 12 wherein the non-woven fabric.