The name of the invention: the spout plug and packaging container
Technical field
[0001] The present invention relates to a spout stopper and packaging container.
Background technique
[0002] Obstruction beverage, liquid seasoning, provided with a spout plug threaded portion to the spout of the product of the container body of cosmetics has been formed (spout), a spout with a cap that was formed can be screwed threaded portion in this technique is known. Such a spout stopper and cap, even after opening once to remove the cap, by screwing the threaded portion with each other again, it is possible to capping repeatedly.
[0003] Patent Document 1, the inner surface of the closed end of the cap body, the spout of the spout body cap body contact ring and the inner ring enhances the tip engaged with the sealing of (the spout stopper) is provided It has been disclosed.
[0004] Patent Document 2, that is formed by expanding the tip of the spout at the same angle as the inclination angle of the paper container inclined plate, is the mouth with a good spout with small amounts of liquid out the occurrence of liquid dripping when poured out of the liquid contents It has been disclosed.
[0005] For attachment to the container body of the spout stopper made of a resin material is welded in addition to the flange provided with the ultrasonic vibration spout plug, it is often used an ultrasonic welding method.
[0006] Patent Document 3, thickness-reducing portion to the inner edge near the flange surface by providing the (annular watermark unit), the vibration generated during the ultrasonic welding, the half cut portion of the partition wall (blockade plate) for closing the spout stopper ( spout stopper to prevent the crack suppressing being transmitted to the annular thin line of weakness) occurs (pull ring with port plug) is disclosed.
[0007] Patent Document 4, the spout stopper provided with a thinned portion mentioned above, the protrusions provided to the container body at equal intervals in the circumferential direction of the side wall in order to suppress with the flange, deformed by the energy of ultrasonic vibration to suppress the, ribs at positions corresponding to the protrusions to a inner surface of the thinned portion, dispersing the energy of the ultrasonic vibration technique to be absorbed is disclosed.
CITATION
Patent literature
[0008] Patent Document 1: Laid-open Publication No. 2004-331221
Patent Document 2: Laid-open Publication No. 2008-018971
Patent Document 3: Unexamined Publication No. 2004-067101
Patent Document 4: Unexamined Publication No. 2011-105383

Summary of the invention
Problems that the Invention is to Solve
[0009] However, when mounting the container body of the spout by welding, it is the material of the spout with a low-density polyethylene resin, the material of the cap using a polypropylene resin or a high density polyethylene resin is harder material than this many. In the case of using such a material, to form a contact ring on the cap, the contact portion between the contact ring of the spout, the engagement marks tends to remain in the contact ring. In particular, Kakarigoato of the remaining contact ring to the spout is made as top circumferential V-shaped groove of the spout of the rest, and the cause of the deterioration of the liquid out the performance of the content liquid to be poured out.
[0010] The present invention has been made in view of the above problem, without degrading the ink ejection cutoff performance of the mouth body, providing a spout stopper and packaging container using the same prevent deterioration of the sealing performance of the cap an object of the present invention is to.
[0011] Also, such Kuchisen is often used in welded and fixed to the packaging container. Therefore, after the welding, for the purpose of enhancing the sealing property between the spout plug and packaging container, the material of the spout low-density polyethylene resin (LDPE, L-LDPE) is often used. In such a case, the material of the cap, the use of low-density polyethylene resin higher polypropylene resin and high density polyethylene resin having rigidity as compared to the like, to enhance the sealing property between the spout and the cap can.
[0012] However, the rigidity of the spout is higher than the rigidity of the cap, when the excessive torque is applied to both, falling in the inner circumferential direction by the load lower spout rigidity is received from the internal thread of the cap, the internal thread of the spout screw overcome the part "overrun" may occur. When the overrun occurs, screwed the cap becomes incomplete, content solution is likely to leak. Further, since the portion of the external thread of the spout is cut by the threaded portion of the cap by overrun, play (gap) is generated in the engagement, the sealing performance of the spout plug may be reduced.
[0013] The present invention has been made in view of the above problems, use the cap and Kuchisen even when an excessive torque is applied to the body, spout stopper and this that it is possible to suppress the occurrence of overrun and to provide a packaging container had.
[0014] Further, in such mouth, when screwed on the threaded portion to each other is screwed a cap spout so as to match the screwing axes of the cap and spout, if by then rotating the cap, It screwed hard in a state in which the threaded portion with each other is engaged correctly. Not screwed axes of the cap and spout are matched, while the cap is obliquely relative to the spout, when trying to forcibly rotate the cap by the user, or can not threaded, threads prone to screwing defects such as if you are or are fixed in an incomplete state, which does not mesh properly.
[0015] In addition, the threaded portion of the cap, liquid easy to contact anyone to prevent the shape of the spout tip prior to contact with the threaded portion of the spout. Therefore, a user, attempting to screwing the cap onto the spout stopper so as to match the center axis of the cap and the spout, since the threaded portion of the cap is brought into contact with the dripping prevention shape, the posture of the cap It has been changed, which may cause screwed defect can not be screwed correctly the cap to the spout.
[0016] The present invention has been made in view of the above problems, and an object thereof is to provide a spout stopper and packaging container using the same can be prevented from occurring engagement failure of the threaded portion of the cap and the spout stopper .
[0017] Further, as in Patent Documents 3 and 4, in order to suppress deformation of each part of the spout plug during ultrasonic welding, although the provision of the thinned portion and the ribs have been proposed, for the preferred design, It was not sufficiently been studied.
[0018] The present invention has been made in view of the above problems, and an object thereof is to provide a spout stopper and packaging container using the same can be suitably suppress deformation of each part by ultrasonic welding.
Means for Solving the Problems
[0019] One aspect of the present invention for solving the above problems, a mouth plug body having a cylindrical side wall, and a cap which is mounted from the upper side which is one end of the side wall, the upper edge of the side wall, the side walls of the are formed protruding portion protruding outward, the top surface of the upper end of the side wall, in a state in which the cap is mounted on the side wall, a spout stopper surface contact over the entire circumference at a predetermined contact surface of the cap inward.
[0020] Other aspects, mouth plug body and a cylindrical side wall inner screw on the inner circumferential surface is formed, including a cylindrical side wall having an outer screw is formed on the outer peripheral surface of the present invention for solving the above wherein the comprises a cap which is screwed from the upper end which is one end of the side wall of the mouth body, the lower end of the side wall of the mouth body, provided from the lower edge of the side wall of the spout body extends outwardly was disk-shaped flange portion is formed, externally threaded along the threaded shaft direction from the connection position between the flange portion of the side wall of the mouth body, a third of the distance between the connection position and the upper edge it is formed in a range of a distance of 2 or less of one or more 3 minutes, the spout stopper.
[0021] Another aspect of the present invention for solving the above problems is provided with a mouth plug body having a cylindrical side wall and a cap which is screwed from the upper end which is one end of the side wall, the outer peripheral surface of the side wall, the outer an outer threaded portion which screw is formed, a region of the upper end side of the outer threaded portion, and a guide portion having an outer screw is not formed, threaded inner inner peripheral surface of the cap, which is screwed with the external thread has a threaded portion inner but formed, along the threaded shaft direction, the distance between the forming end position is formed starting position and the lower end which is the upper end of the inner screw, the upper edge of the side wall of the outer screw guide portion length is a distance to the forming start position of the upper side smaller than a spout stopper.
[0022] Another aspect of the present invention for solving the above problems, a cylindrical side wall, closes the interior of the side wall, the partition wall half cut is formed in the outer peripheral portion, it extends outwardly from the lower edge of the side wall on the side opposite to the side wall of the disk-shaped flange portion and the flange portion provided on the side walls and the concentrically groove-shaped thinned portion provided, thinned portions plurality of ribs provided on the inner surface of the with the door, each of the plurality of ribs, along the circumferential direction of the thinned portion, the distance between adjacent ribs is 0.5mm or more 5.0mm or less, a spout stopper.
[0023] Another aspect of the present invention comprises a container body, a spout stopper described above which is attached to the container body, a packaging container.
Effect of the invention
[0024] Spout plug according to the present invention without deteriorating the ink ejection cutoff performance of the mouth body, it is possible to prevent a decrease in sealing performance between the cap and, when an excessive torque is applied to the cap and Kuchisen body even, it is possible to suppress the occurrence of overrun, also prevents bad engagement of the threaded portion of the cap and Kuchisen body, also can suppress deformation of each part by ultrasonic welding. The present invention can provide a packaging container using such a spout stopper.
Brief description of the drawings
[0025] [1] Figure 1 is a sectional view showing a spout plug according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a packaging container according to an embodiment of the present invention.
[3] FIG. 3 is a sectional view showing a spout plug according to a modification of the present invention.
[4] FIG. 4 is a sectional view showing a spout plug according to an embodiment of the present invention.
[5] FIG 5 is a sectional view showing a spout plug according to an embodiment of the present invention.
[6] FIG 6 is a sectional view showing a state of screwing the cap onto the spout plug according to an embodiment of the present invention.
[7] FIG. 7 is a sectional view showing a spout plug according to an embodiment of the present invention.
[8] FIG. 8 is a bottom view showing a spout plug according to an embodiment of the present invention, is an enlarged view and a partial sectional view.
[9] FIG. 9 is a bottom view showing a spout plug according to a modification of the embodiment of the present invention, is an enlarged view and a partial sectional view.

DESCRIPTION OF THE INVENTION
[0026] The spout tap 3 and the packaging container 5 according to an embodiment of the present invention will be described with reference to FIGS. 1 shows a cross-sectional view of the spout plug 3 including a spout body 1 and the cap 2. In Figure 2, a spout stopper 3 made of a mouth body 1 and the cap 2 Prefecture, shows a perspective view of the packaging container 5 including a container body 4. It should be noted that, in the present specification, the term "engagement", to engage the threads together with the side wall of the cap and Kuchisen body, the fitting (attached both by rotating them in the relatively circumferential direction ) refers to. In addition, the term "threaded shaft", be on the circumference of the heart that form of thread, extending a cap and Kuchisen body in the direction of the cap is to move during the screwing, that of imaginary line Say.
[0027] First, the spout plug 3 and Kuchisen body 1, a description will be given of the cap 2.
Spout plug 3, as shown in FIG. 1, and a mouth body 1 and the cap 2. Mouth body 1 has a cylindrical side wall 11. The side wall 11, top surface 109 on the upper side is formed which is one end. Cap 2 includes a cylindrical side wall 21, the top plate 24, and a contact surface 27 which is vertically formed on the threaded shaft. Cap 2 is mounted from the upper end of the side wall 11 of the mouth plug body 1. The upper edge of the side wall 11, protruding portions 15 which protrude outwardly of the side wall 11 is the formation, the top surface 109 of the upper end of the side wall 11, in a state of being attached to the cap 2 on the side wall 11 of Kuchisen body 1, surface contact with the contact surface 27 of the cap 2. The protrusions 15, to enhance the content liquid spout when the liquid out performance by forming the upper edge of the side wall 11 of the spout body 1 and protrudes outward, the liquid content during pouring is the outer peripheral surface of the side wall 11 transmitted down it is possible to prevent the mouth plug body 1 is stained with. Note that the upper end of the side wall 11 of the mouth body 1 refers to the paper upper side in FIG. 1 of the side wall 11.
[0028] The lower edge of the spout body 1 of the side wall 11, a disk-shaped flange portion 16 that extends outwardly is formed. Flange portion 16, as shown in FIG. 2, a container body 4, in producing the packaging container 5 comprising a spout plug 3 mounted on the container body 4, the container body 4 and the spout plug 3 the joints. The bonding method can be used ultrasonic welding.
[0029] Below the projection 15 provided at the upper end of the spout body 1 of the side wall 11, a first outer diameter section 13 cylindrical, which outer diameter is larger than the cylindrical second outer diameter section 14 with a door. On the outer peripheral surface 17 of the second outer diameter 14, internal threads 22 and can be screwed external threads 12 of the cap 2, which will be described later, it is formed.
[0030] Cap 2, as shown in FIG. 1, it has a cylindrical side wall 21 internal thread 22 is formed on the inner peripheral surface 23, a top plate 24 that covers the side wall 21 from the upper side. The side wall 21 and the top plate 24 are connected by the thick portion 26 provided over the upper end of the side wall 21 to the outer periphery of the top plate 24. The inner circumferential surface 23 of the side wall 21, external threads formed on the sidewall 11 of the spout body 1 12 and can be screwed inner thread 22 is formed. Inside the cap 2, together with the adjacent one end thereof to the top plate 24, formed adjacent to the thick portion 26, a cylindrical inner ring 25 is formed. The lower end of the thick portion 26, contact surface 27 is formed perpendicular to the threaded shaft.
[0031] As shown in (b) of FIG. 1, the height of the contact surface 27, in a state of mounting the cap 2 on the side wall 11 of Kuchisen body 1, the top surface 109 of the side wall 11 is in surface contact over the entire circumference, further is formed so as to elastically deform by the side wall 11 is subjected to compressive load. Further, the outer peripheral surface of the inner ring 25, with its partially fitted with a cap 2 and projects over the entire circumference on the side wall 11 of Kuchisen body 1, is formed to be in contact with the inner circumferential surface 19 of the side wall 11 .
[0032] In this embodiment, when attaching the cap 2 to the side wall 11 of Kuchisen body 1, after capped 2 from the upper end of the side wall 11, the cap 2 is rotated in the circumferential direction relative to the side walls 11 screwing the external thread 12 and inner thread 22. When screwing the external thread 12 and inner thread 22 is completed, as described above, the top surface 109 of the upper end of the side wall 11 is in surface contact with the contact surface 27 of the cap 2, the side walls 11 of the mouth body 1 the elastic deformation as well as, an outer peripheral surface of the inner ring 25 contacts the inner circumferential surface 19 of the side wall 11.
[0033] In the present embodiment, the protrusion 15, by increasing the area of ​​the top surface 109, the contact area between the contact surface 27, greater can be secured as compared with conventional, it is possible to improve the sealing performance.
[0034] Further, when attaching the cap 2 to the side wall 11 of Kuchisen body 1, so that the side wall 11 is elastically deformed, since forming the contact surface 27, top surface 109 is in surface contact with the contact surface 27 with a high contact pressure , it is possible to improve the sealing performance.
[0035] Further, the side walls 11 of the mouth body 1, the top surface 109 and the projection 15, from the contact surface 27, together with receive a downward force as indicated by arrow A in FIG. 1 (b), the inner circumferential surface 18 , from the inner ring 25 receives a force outward as indicated by the arrow B in FIG. 1 (b). Therefore, the side wall 11 by the resultant force of these forces is subjected to force in the obliquely downward as indicated by arrow P in FIG. 1 (b), the side walls 11, so that the elastically deformed in a direction to be widened. As a result, the side walls 11 of the mouth body 1 by the restoring force, the contact surface 27 to top surface 109, the outer peripheral surface of the inner ring 25 so as to press the inner peripheral surface 19 in contact with the cap 2. Therefore, it is possible to further improve the sealing performance by the mouth body 1. Note that this force is in the range of elastic deformation, the sidewall 11 after opening the cap 2, immediately returns to its original shape.
[0036] Further, by the contact pressure to the contact surface 27 of the side wall 11 of spout body 1 is increased, required for rotation of the cap 2 torque (hereinafter, referred to as opening torque) can be increased, to prevent loosening of the cap 2 it can. In general, when larger forming the lead angle of the screw, although that can reduce the rotational speed until the engagement completion, the cap is easily loosened, even larger the mouth body the lead angle, the present invention it is possible to prevent the loosening of the cap by applying, while reducing the rotational speed of up screwing completion, it is possible to provide a hard spout body loosening of the cap.
[0037] Rigidity of the cap 2 is preferably higher than the rigidity of the side walls 11 of the mouth body 1. For example, the material of the side wall 11 of the mouth body 1, using a low-density polyethylene resin (LDPE, L-LDPE), as the material of the cap 2, it is possible to use a polypropylene resin and high density polyethylene resin. By using such a material are in a relationship, the amount of elastic deformation of the side walls 11 of the mouth body 1 is increased, it is possible to use a side wall 11 as the packing, it is possible to enhance the sealing performance.
[0038] 3 shows a modification of the present embodiment. In the present embodiment, the lower end of the thick portion 26 and the contact surface 27 formed in parallel with the top plate 24, as shown in FIG. 3, without providing a portion corresponding to the thick portion 26, the top plate one part may be used as a contact surface. Mode of contact between the side walls and cap of the mouth body is not limited to the embodiment and its modifications described above, the contact mark which side wall is in contact with the cap over the entire circumference, and leads to deterioration of the ink ejection cutoff performance of the content liquid unless remains on the side wall and its position, it goes without saying that the shape can be arbitrarily selected. Shape of the upper end of the side wall of the mouth body, for example, is variously be implemented according to the design of the protrusion or the like for the liquid dripping preventing. The shape of the cap is also variously feasible. Therefore, such in accordance with the diversity, for example, such as the top surface of the upper end of the side wall of the mouth body, rather than a strict uppermost, top surface (curved or comprising a chamfered portion of the outer vicinity continued from uppermost plane), or, in case of providing the protruding portion outer end portion of the protrusion, the upper end toward the inner peripheral surface of the side wall of the cap, even in contact with the strict non-horizontal plane chamfer (curved or plane) good.
[0039] Inner thread 22 of the outer thread 12 and the cap 2 of mouth plug body 1 of the side wall 11 may be a single thread screw, it may be a multi-start screw.
[0040] In the present embodiment, by forming a thread on the side wall 11 of the cap 2 and Kuchisen body 1, it was used screw cap type mouth stopper main body to be screwed to one another, the top surface 109 of the side wall 11 and the cap 2 if we seal the mouth of the plug body by contact surface 27 in surface contact, the kind of mouth plug body can be anything. For example, a mouth plug body for capping the container opening, the present invention in stoppered cap and a cap for closing the mouth plug body joined by a hinge is applicable.
[0041] Embodiments of the present invention will be further described with reference to FIG.
[0042] In Figure 4, cross-sectional view of the spout plug 3 in a state where screwed cap 2 (a), showing the enlarged view of (b). Mouth body 1 is formed at the lower end of the side wall 11, it has a partition wall 104 that separates the side wall 11 inside the upper side and the lower side. Here, the upper end of the side wall 11 refers to the one end side (in FIG. 4 the paper upward) the cap 2 is screwed.
[0043] A partition wall 104 is provided with a pull ring 103. Note the user of outlet plug 3, by pulling out the partition wall 104 with a pull ring 103 can be opened to communicate with each other and the top and bottom ends of the side wall 11.
[0044] Between the inner ring 25 and the sidewall 21, the upper end portion of the sidewall 11 of the mouth body 1 abutting portion 28 is provided with a region of surface contact over the entire circumference, higher sealing property can be obtained. Contact portion 28, and an outer peripheral surface, an upper end portion closer to the inner circumferential surface of the side wall 21 of the upper end portion and its vicinity of the side wall 11 in a screw-attaching state may be those Sessure entire circumference, the inner ring 25 in the cap 2, it may be provided in any of the top surface portion sandwiched between them.
[0045] As shown in FIG. 4 (b), ranges formed in the outer screw 12 (L2) along the threaded shaft direction of the mouth body 1, from the connecting position between the flange portion 16 of the side wall 11, the It ranges up to a distance of 2 or less of at least one-third third of the distance between the connection position and the upper edge (L1). Here, the connection position between the flange portion 16 of the side wall 11, a position of the upper surface of the flange portion 16, as shown in FIG. 4, the height of the upper surface of the portion facing the lower end of the side wall 21 of the cap 2 whose If higher than the height of the upper surface of the outer is the higher part of the means the position of the upper surface of the portion facing the lower end of the side wall 21. The lower end position external thread 12 is formed may strictly be non-connected position between the flange portion 16 of the side wall 11. Range external threads 12 of which can not be engaged with the internal threads 22 for example, naturally may not be formed, in this case, the lower end position of the outer screw 12 is approximately 1 pitch of the screw thread from the connection position between the flange portion 16 it may be upward.
[0046] Overrun external thread 12, the internal threads 22 get over each other, when the rigidity of the mouth body 1 is lower than the rigidity of the cap 2, apt to occur by the inner screw 22 is pushed inwardly, high conversely If, likely caused by the cap 2 is pushed toward the outside. To suppress overrun, it is preferable to set the rigidity of the spout body 1 and the cap 2, as follows. For example, the stiffness of the material used for the cap 2 may be higher than the rigidity of the material used for the side walls 11 of the mouth body 1. For example, the material of the cap 2, a polypropylene resin or a high density polyethylene resin, a sidewall 11 of the mouth body 1, it is possible to use a low-density polyethylene resin. Further, the flexural modulus of the material of the cap 2, for example a 1000MPa or more 1500MPa or less, the flexural modulus of the material of the side wall 11 of the mouth body 1 is preferably, for example, 100MPa or more 200MPa or less. The material of the flexural modulus of the cap 2 is less than 1000 MPa, since the easily deformed, when it takes an excessive rotation load to cap 2, spreads the diameter of the internal thread 22, inner thread 22 is externally threaded 12 overcame, becomes overrun is likely to occur. In addition, and 1500MPa larger than, the inner ring 25 is less likely to elastic deformation, sealing performance is reduced to creep deformation. The material of the flexural modulus of the mouth plug body 1 of the side wall 11 is less than 100MPa, for easily deformed, the internal thread 22 is pushed toward the side wall 11 of the mouth plug body 1 to the inside, inner thread 22 outside overcoming the screw 12, becomes overrun is likely to occur. Further, a 200MPa larger, deformation hardly strength occurs, it becomes difficult to open pull out the partition wall 104 with a pull ring 103.
[0047] The outer screw 12 by the connecting position between the flange portion 16 of the side wall 11, provided in a range of up to 2 or less of the distance of one or more third third of the distance (L1) between said connecting position and the upper edge, that is, by providing a range including the lower portion closer to the side wall 11 are higher rigidity by the flange portion 16 and the partition wall 104, even if external thread 12 is pressed by the inner screw 22, the side wall 11 is deformed inwardly can be less likely, the overrun can be less likely to occur.
[0048] Ranges formed in the outer screw 12 is, from the connecting position between the flange portion 16 of the side wall 11, is less than one third of the distance (L1) between the upper edge of the connecting position and the side wall 11, the cap 2 and the inner screw 22 is made to be engaged only at the lower end portion of the diameter of contagious cap 2, also the number of turns of the external thread 12 is reduced, a sufficient engagement is difficult to obtain. Further, ranges formed in the outer screw 12 is, from the connecting position between the flange portion 16 of the side wall 11, if greater than two thirds of the distance (L1) between the upper edge of the connecting position and the side wall 11, side walls 11 of the portion outside the screw 12 is not formed becomes short, when inserting the cap 2 into Kuchisen body 1, no longer fulfill the function as a guide to match the screwed shaft of the rotary shaft and the screw of the cap 2, hardly the screws to properly engaged.
[0049] Further, the mouth body 1 manufactured by injection molding, in order to improve the escape from the mold, the taper may be attached so as to extend toward the lower end from the upper end of the side wall 11. Therefore, the thickness of the side wall 11, the lower end becomes larger than the upper end, the rigidity of the side wall 11 is greater than the lower end. Therefore, when providing the taper, by forming the external thread 12 of the mouth body 1 within the above range, even by the taper, the effect of suppressing the occurrence of overrun is obtained. It is also possible to taper is provided in the cap 2 spreads diameter towards the lower end from the top as well. Even in this case, ranges formed in the outer screw 12 is, from the connecting position between the flange portion 16 of the side wall 11, if more than one-third of the distance between the upper edge of the connection position and the side wall 11 (L1) sufficiently screw engagement, it is possible to suppress the occurrence of overrun.
[0050] Further, the spout plug according to the prior art, in order to suppress overrun by increasing the rigidity of the side wall, has been adopted a method of increasing the number of windings of the external threads of the side wall. However, in the present embodiment, by forming the external thread 12 on the above-mentioned range, it is possible to suppress the occurrence of overrun, the winding number of the side wall of the outer screw 12 can be reduced than ever. Therefore, the user of the spout plug 3 can be compared to conventional spout stopper, easily the screwing and removal of the cap 2 with a smaller number of revolutions.
[0051] Further, on the upper end of the side wall 11, increasing the area not formed with the outer screw 12. As a result, the region becomes a guide for fitting the cap 2, it is easy screwing-screwing of the cap 2 along the threaded shaft. Further, a content liquid in the area tends wipe this even when adhered.
[0052] Embodiments of the present invention will be further described with reference to FIGS.
[0053] In Figure 5, cross-sectional view of the spout plug 1 in a state screwed cap 2 (a), showing the enlarged view of (b). Mouth body 1 has a guide portion 113 which is located outside the screw from the outer thread 12 at the upper side area not formed.
[0054] As shown in (b) of FIG. 5, the internal thread 22, between along the threaded shaft direction, the threaded portion forming the end position within a threaded portion formed starting position and the lower end among which is the upper end of the inner screw 22 distance (L3) is formed from upper edges of the side walls 11 of the mouth body 1 smaller than the length of the guide portion 113 is a distance to the outer threaded portion formed starting position of the upper end side of the outer screw 12 (L4) .
[0055] Further, as shown in (c) of FIG. 6, in a state in which the cap 2 is fitted along the threaded shaft to the side wall 11 of Kuchisen body 1, the inner circumferential surface 23 of the side wall 21 of the cap 2, the mouth the distance between the screw crest of the external threads 12 formed on the side wall 11 of the plug body 1 (D1), the distance between the outer peripheral surface 18 of the screw crest and the guide portion 113 of the internal thread 22 of the cap 2 (D2) may be smaller than formed.
[0056] Figure 6 is a sectional view showing a state of screwing the cap 2 on the side wall 11 of the spout body 1.
[0057] Initially, the user put the upper end of the cap 2 on the side wall 11 of Kuchisen body 1 ((a) in FIG. 6). At this time, such as by an inner screw 22 and the projection 15 are in contact, the posture of the cap 2 may be inclined with respect to threaded shaft direction.
[0058] Then, the user, to start the insertion toward the cap 2 to the threaded shaft direction (of Figure 6 (b)). At the stage shown, not in contact with the internal threads 22 and external threads 12. Further, the inner screw 22, since facing the guide section 113, when the inclination of the cap 2 is greater than a predetermined amount, receives the resistance by the inner screw 22 is brought into contact with the guide portion 113, with the progress of insertion on, the amount of inclination of the cap 2, is reduced gradually.
[0059] The guide portion 113 may have a portion whose outer diameter increases toward the outer thread 12 on the lower side of the projection 15. For example, the guide unit 113 includes a first outer diameter section 13 formed on the lower end side of the protruding portion 15 is formed a lower end of the first outer diameter section 13 on the upper end side of the outer screw 12, the 1 of a second may have an outer diameter 14 having a larger outer diameter than the outer diameter 13. In this case, the lower end of the cap 2, after passing through the first outer diameter section 13, more by passing through the second outer diameter section 14 having a larger outer diameter, inserted at the start of the cap 2, the lower end of the cap 2 When the first can be easily inserted because of the large distance between the outer diameter portion 13, during the subsequent insertion progresses, the distance between the lower edge and the second outer diameter section 14 of the cap 2 becomes small, the cap 2 the amount of tilt can be reduced smoothly.
[0060] The user subsequently, the inner circumferential surface 23 of the side wall 21 of the cap 2, to insert the cap 2 to the position facing to the screw crest of the external threads 12 of the side wall 11 of spout body 1 (shown in FIG. 6 (c) ). Since the inclination of the cap 2 is reduced, the insertion proceeds smoothly. Even if the slope is not completely eliminated, when the inner circumferential surface 23 passes through the screw summit portion of the outer screw 12, subject to contact with resistance to the screw summit area. Also about the same time, the screw summit portion of the inner screw 22 is subjected to a contact with resistance on the outer peripheral surface 17 of the second outer diameter 14. These, with the progress of insertion, the slope of the cap 2 is further reduced.
[0061] The user subsequently, the inner screw 22 the lower end side, to a position in contact with the upper side of the outer screw 12 to insert the cap 2 (in FIG. 6 (d)). Thus, the internal threads 22 and external threads 12 are in contact. At this stage, inclined with respect to the side wall 11 of the cap 2 has been eliminated. Therefore, the user, when rotating the cap 2, without causing the screwing poor, the side wall 11 of the cap 2 and Kuchisen body 1 can be engaged easily screw.
[0062] In the spout plug according to the present embodiment, the distance between the upper end and is formed starting position and a lower end forming the end position of the inner screw 22 (L3) is out of the upper edge of the side wall 11 of the spout body 1 guide portion length is a distance to the forming start position of the upper end side of the screw 12 (L4) is less than. Therefore, from passing through the vicinity of the upper end of the side wall 11 of the lower end of the mouth body 1 of the cap 2, to the external threads 12 of the screw 22 and Kuchisen body 1 of the side wall 11 of the cap 2 is in contact, the cap 2 the insertion distance (L4 or more), can be longer than the distance of movement of the cap 2 (about L3) with the subsequent screwed progress. In other words, the insertion of the cap 2 is in progress, after the inclination of the cap 2 has been reliably reduce, can be outside the screw 12 Togakamiau so of internal threads 22 and Kuchisen body 1 of the side wall 11 of the cap 2. The insertion because the distance is long, when the protrusion 15 during insertion start and the inner screw 22 are in contact, which external thread 12 and internal thread 22 and the cap 2 to determine the user erroneously assumed in contact start the rotation it is possible to prevent the failure to screwed.
[0063] Further, in the spout plug according to the present embodiment, the distance between the inner surface 23 of the side wall 21 of the cap 2, a screw crest of the external threads 12 formed on the sidewall 11 of the spout body 1 (D1 ) than, it is preferable that the distance (D2) is greater between the outer peripheral surface 17 of the screw crest and the guide portion 113 of the internal thread 22 of the cap 2. Thus, as shown in (c) of FIG. 6, the interference between the internal thread 22 of the lower end Kuchisen body 1 of the side wall 11 of the cap 2, accurately aligning the threaded shaft (precision D1) that This makes it, in portions other than the lower end of the cap 2, between the side walls 11 of the mouth body 1, it is possible to suppress unnecessary interference with a constant clearance D2 (> D1), and external threads 12 and internal threads 22 it can be the engagement of when screwed more smoothly.
[0064] Further, in the case of forming the threaded portion on multiple thread screw, when screwed, a plurality of threads starts meshing simultaneously. Therefore, in general, multiple thread screw, the allowable value of the inclination of the cap to be compared with the single-thread screw does not generate a screwing failure is reduced. Accordingly, the present invention, by using the spout stopper multi-start thread is formed, particularly remarkable effects can be obtained.
[0065] Further, even if inclined upper and contact the cap the cap and the side wall when fitted on the side wall of the cap, it is possible to correct this, restriction of the shape of the upper end of the side wall is reduced. For example, the amount of projection of the projecting portion for liquid dripping preventing increased within the cap inner diameter can be larger than the outer diameter of the externally threaded outer diameter of the side wall upper end.
[0066] Embodiments of the present invention will be further described with reference to FIGS. Figure 7 shows a cross-sectional view of the spout body 1. The (a) of FIG. 8, bottom view of the spout body 1, in (b) is an enlarged view of a rib 108, the (c), the ribs 108 a line B-B '(shown in FIG. 2 (b) It shows a cross-sectional view taken circumferentially reference). Incidentally, the cross-section shown in FIG. 7 is a longitudinal section taken along the line A-A 'shown in (a) of FIG.
[0067] Mouth body 1 has a cylindrical side wall 11, closes the interior of the side walls 11, a partition wall 104 half cut 141 is formed in the outer peripheral portion, it is provided to extend outward from the lower edge of the side wall 11 a disk-shaped flange portion 16, the side wall 11 of the flange portion 16 on the opposite side, and the groove-like meat stealing section 18 provided in the side wall 11 and the concentric circles, provided on the inner surface of the meat stealing part 18 and a plurality of ribs 108. Here, the lower end of the side wall 11 refers to the paper surface lower side in FIG. 1. As shown in (a) of FIG. 7 and FIG. 8, the upper end side of the flange portion 16 from the side wall 11, protruding portion 119 that protrudes from the side wall 11 outwardly, are three formed circumferentially equal intervals . The number of protrusions 119 may be greater than three.
[0068] Partition wall 104 is connected to the side wall 11 the wall thickness of the outer peripheral through a half-cut 141 is made thinner annularly formed. The partition wall 104, pull ring 103 is connected via a strut. User's mouth plug body 1, pull the pull ring 103 upwardly, pulling out the partition wall 104 that is broken along the half-cut 141 from the side wall 11, that opens to communicate the upper side and the lower side of the side wall 11 can.
[0069] Flange portion 16, as shown in FIG. 2, a container body 4, in producing the packaging container 5 comprising a spout plug 3 mounted on the container body 4, the container body 4 and the spout plug 3 the joints. The bonding method can be used ultrasonic welding.
[0070] To spout plug 3 ultrasonic welding to the container body 4, first, the side walls 11 of the mouth body 1 is inserted from the inner surface side opening of the container body 4, as shown in FIG. 7, the upper surface of the flange portion 16 fix someone up with the the inner surface of the container body 4. In this case, by sandwiching the opening peripheral portion of the container body 4 between the projection 119 and the flange portion 16, the mouth body 1 is temporarily fixed to the container body 4. Then, by generating Ategai ultrasonic vibrations on the container body 4 which the inserted anvil and ultrasonic horn to the inside of the container body 4 (inside) (both not shown) overlaps the flange portion 16, the container body 4 and fusing the flange portion 16. Vibration generated at this time, the flange portion 16, through the side walls 11, but transmitted to the partition wall 104, a portion of the vibration is absorbed by the thinned portion 18.
[0071] Thinned portion 18, the side wall 11 of the flange portion 16 on the opposite side, a groove provided concentrically on the outer circumference of the side wall 11. The cross section of the thinned portion 18 is, for example, as shown in FIG. 7, the resistance to the ultrasonic vibration is strong, a top surface is an inverted U-shape with rounded (dome). Thinned portion 18, by suppressing the propagation of the partition wall 104 of the ultrasonic vibration (dispersion), prevent cracking in the half cut 141 in the partition wall 104.
[0072] As shown in (a) ~ (c) of FIG. 8, on the inner peripheral surface of the thinned portion 18 is provided side by side rib 108. At this time, (the circumferential length of the rib 108 in the groove width center of the thinned portion 18) each of length L5 of the plurality of ribs 108 along the circumferential direction of the thinned portion 18 may if more than 0.3 mm, production of mold becomes easier if more than 0.5mm, it should be noted that preferred. Also, L5 is preferably 1.5mm or less. Further, (circumferential length between adjacent ribs 108 in the groove width center of the thinned portion 18) spacing L6 between adjacent ribs 108 with each other is preferably in 5.0mm below the range of 0.5 mm. By the L5 and L6 is set in this range, the meat steal 18 rigidity around while having a function of suppressing meat theft unit 18 the propagation of the ultrasonic vibration can be secured. Therefore, to suppress the crack of the half-cut, also can be the outer edge of the flange portion 16 to prevent deformation such as warped upward. Moreover, by the rib 108, the energy is constant about the absorption of the ultrasonic vibration, to be distributed, co-vibrating the thinned portion 18 near the flange portion 16 and side walls 11 is suppressed, concentration unevenness of the energy is lost. As a result, possible to prevent the flange portion 16 and the side wall 11 is deformed so as to hit the waves. In the example shown in FIG. 8, the 24 ribs 108, although the 24 dividing the entire periphery of the thinned portion 18, for example, by 6 or more 30 or less ribs, the number of divisions and 6 to 30 it is preferred. If L5 is 0.3mm less than or,, L6 is greater than 5.0mm or, if the division number is less than 6, in the whole circumference of the meat theft unit 18, a small percentage of the area to be filled by the ribs 108, sufficiently difficult to secure the rigidity. Also, if L5 is greater than 1.5mm or, if L6 is 0.5mm smaller than, or, if the division number is larger than 30, the total circumference of the thinned portion 18, the ratio of the area to be filled by the ribs 108 since the large, difficult to suppress effect is obtained the propagation of ultrasonic vibration, also forming efficiency is lowered. In addition, if the L5 and L6 is smaller than 0.5mm, manufacture of the mold becomes difficult, and the L6 is larger than 5mm, the above-described warping or waving occurs.
[0073] From the above, according to the present invention, it is possible to provide a packaging container 5 with spout tap 1 and which can suppress deformation of each part by ultrasonic welding. News, or to increase the vibration energy during the ultrasonic welding, by shortening the vibration cycle, it is possible to improve production efficiency. It is also possible to reduce costs by, for example, the thickness of the half-cut 141.
[0074] The shape of the thinned portion 18 is not limited to the example shown in FIG. Bottom view of the spout body 1 according to a modified example in FIG. 9 (a), enlarged view of the rib 108 (b), the reference line B-B 'of the ribs 108 (c) (shown in FIG. 9 (b) ) in a cross-sectional view taken along the circumferential direction. In the example shown in FIG. 8, cross-sectional shape of the thinned portion 18 along the line A-A 'is it has a rounded shape with a U-shaped, as shown in FIG. 7, as in the example shown in FIG. 9 in may have a linear configuration consisting of taper substantially flat top surface Prefecture.
[0075] Having described an embodiment of the present invention, the present invention not only as the above embodiment, the addition of the spout stopper or a part deforming a portion of the feature combination as appropriate of the above embodiments Notes also as an outlet plug and packaging container having these can be implemented.
Example [0076]
to confirm the sealing performance of the mouth body, to measure the rotational torque after engagement of the cap and Kuchisen body according to Examples and Reference Examples. Each reference example later, to verify the individual effects of the preferred respective features in the embodiments described above, a modification, not necessarily departing from the scope of the present invention, another of the present invention it can be regarded as an embodiment with the features.
[0077] (Example 1-1)
as in Example 1-1, to form a projection 15 on the upper edge of the side wall 11 of the mouth body 1, with the mouth body 1 according to the above-described embodiment shown in FIG.
[0078] (Reference Example 1-1)
as the reference example 1-1, was used spout body shape corresponding to the projection 15 of the mouth body 1 is not formed. Others were the same as the mouth body 1.
[0079] (Test method)
to prepare a sample of Example 1-1 and Reference Examples 1-1, respectively, immediately after the set (Note attached to the outlet plug of the container body), content liquid filling (set three days after, 70 ℃) immediately after after 1 day filled in and the filling 14 days after filling 7 days was measured opening torque (N · cm). The test results are shown in Table 1.
[0080] [Table 1]

[0081] From Table 1, the mouth body according to Reference example 1-1, it can be seen that there is a tendency that the opening torque decreases from after filling. On the other hand, the mouth stopper main body 1 according to the embodiment, is not observed a large reduction of even opening torque even after filling 14 days. This result is the mouth body 1 according to the embodiment 1-1, it is possible to be able to longer periods remain difficult loosening the cap compared to the mouth body according to Reference example 1-1, it more sealing performance is high could be confirmed.
[0082]
(Example 2-1)
embodiment of the present invention 2-1, a spout plug 1 according to the above-described embodiment shows a cross-sectional view in FIG. 4 (a). Example 1, external threads 12 from the connection position between the flange portion 16 is formed in a range of up to 60% of the height of the distance between the connection position and the upper edge. Incidentally, the cap 2, with a polypropylene flexural modulus 1470 MPa, mouth body 1, with low density polyethylene flexural modulus 120 MPa.
[0083] (Example 2-2)
Example 2 changes the formation range of the outer screw 12 in the embodiment 2-1, the connection position between the flange portion 16, the distance between the connection position and the upper edge 58.7 % of those formed in the range up to a height. Incidentally, an L1 above 12.70 mm, was 7.45mm and L2.
[0084] (Example 2-3)
Example 2-3 changes the formation range of the outer screw 12 in the embodiment 2-1, the connection position between the flange portion 16, the distance between the connection position and the upper edge 55 % of those formed in the range up to a height. In addition, the L1 described above 14.34mm, was 7.89mm the L2.
[0085] (Reference Example 2-1)
Reference Example 2-1, changing the formation range of the outer screw 12 in the embodiment 2-1, the connection position between the flange portion 16, the distance between the connection position and the upper edge 70 % of those formed in the range up to a height.
[0086] (Reference Example 2-2)
Reference Example 2-2, changing the formation range of the outer screw 12 in the embodiment 2-1, the connection position between the flange portion 16, the distance between the connection position and the upper edge 75 % of those formed in the range up to a height.
[0087] (Over-measurement of the run-generated torque value)
Examples 2-1 to 2-3, and using Reference Example 2-1 and 2-2, overrun by measuring the torque generated. Respectively, screwed the cap on the side wall of the unused state, the rotation load was added until the overrun (first time). When the overrun occurs, loosen the screwing of the cap, and the rotation load is applied to again overrun occurs (second time). The measurement results which were conducted on a sample of ten spout stopper, shown in Table 2.
[0088] [Table 2]

[0089] From the measurement results, Examples 2-1 to 2-3, as compared with Reference Examples 2-1 and 2-2, it torque generated overrun the first time is large, i.e., the overrun is less likely to occur There could be confirmed. Further, in either case, but tend to torque the second overrun is lowered is observed, Examples 2-1 to 2-3, its decrease amount as compared with Reference Example 2-2 small, and the value of the torque is about the same as in reference example 2-1 and 2-2, overrun was confirmed that never likely to occur as compared with reference example 2-1 .
[0090] (Overrun leak evaluation at the time of occurrence)
Examples 2-1 to 2-3, by using a packaging container fitted with a Reference Example 2-1 and 2-2, after overrun the liquid contents of the leakage performance of evaluation was carried out. Examples 2-1 to 2-3, removing the partition walls of the spout body according to Reference Examples 2-1 and 2-2, after filling the 1.8 liters of water in the packaging container, screwed to the respective side wall cap overrun the rotation load is applied to occur. Ceased to apply the load at the time when the overrun occurs, the spout plug and cap of the packaging container in situ facing down, to confirm the presence or absence of water leakage. Then, after loosening the screwing of the cap in turn screwed cap by adding a rotational load that overrun does not occur, facing down spout stopper and the cap of the packaging container in the state screwed cap on, to confirm the presence or absence of water leakage. The evaluation results are shown in Table 3.
[0091] [table 3]

[0092] The result of the evaluation, in Reference Examples 2-1 and 2-2, in the state where the overrun occurs, whereas it was not possible to prevent the water leakage in all cases, in Examples 2-1 to 2-3 , small deformation of the side wall even when the overrun occurs, the 16 cases in 7 cases and can prevent water leakage, it was confirmed that the sealing performance is improved. Furthermore, by re-tighten the cap, Examples 2-1 to 2-3, it is possible to prevent water leakage in Reference Example 2-1 and 2-2 together all cases, embodiments overrun as compared with the conventional It was also able to confirm that you can maintain the same level of sealing performance by tightening re after.
[0093]
Examples 3-1 to 3-9 are spout tap 1 according to the embodiment described above shows a cross-sectional view in (a) of FIG. 5, the above L3, L4 is the L3 L3. Among these, examples 3-1,3-2,3-4,3-5,3-7,3-8 and Reference Examples 3-1 and 3-2, the above D1, D2 and D1 D2. In Examples 3-1,3-4,3-7 and Reference Examples 3-1 is provided with a portion where the guide portion has an outer diameter increases toward the lower end, Example 3-2,3-3,3 -5,3-6,3-8,3-9 and reference examples 3-2 was not provided a portion of the outside diameter increases.
[0094] In each of the spout plug, inserted and screwed into the mouth plug body of the cap, to evaluate whether to proceed smoothly without being caught, and the like. The rating is impossible when the number of which was a smooth, ++ when was 10 times out of 10 trials (excellent), + (good) in the case of equal to or more than 7 times, was below 6 times (-) and the. The results are shown in Table 4.
[0095] [Table 4]

[0096] As shown in Table 4, L3 case of the L4, evaluation results - was. Therefore, the effect of the present invention could be confirmed. Also, if the L3