JP4955282B2 - Manufacturing method of closed membrane tube container - Google Patents

Description

  The present invention relates to a method for producing a closed membrane tube container, and more particularly to a closed membrane tube container excellent in the preservation of contents.

Conventionally, as a manufacturing method of a closed membrane tube container, there has been a manufacturing method as shown in FIGS. As shown in FIGS. 10 and 11, in the conventional closed membrane tube container, a disk member 53 having a closed membrane 52 attached to the upper surface of the inner shoulder 51 is welded to the inside of a separately formed tube shoulder 50. Thus, the closing membrane 52 is manufactured by being sandwiched between the inner shoulder 51 and the tube shoulder 50. The upper end of the body portion 54 is welded to the outer periphery of the lower end of the tube shoulder 50. The closed membrane tube container molded in this manner is beautiful in appearance because the closed membrane 52 cannot be seen from the outside except for the lid portion 52a, and has the advantage that the closed membrane 52 does not peel off into the tube vessel. Yes (Patent Document 1). The inner shoulder 51 is composed of a cylindrical part 51a and a shoulder part 51b, and the closing membrane 52 is composed of a lid part 52a, a cylindrical side wall part 52b, and an umbrella-like skirt part 52c.
Japanese Patent Publication No. 3-76818

However, the conventional manufacturing method has the following drawbacks.
(1) As shown in FIG. 10, there is a drawback that the contents in the tube container contacting the vicinity of the inner side of the lower end of the inner shoulder 51 are discolored and deteriorated by outside air. This is because, as shown in FIG. 12, outside air enters the inside through the gap between the tube shoulder 50 and the closing membrane 52 through the unevenness of the flange 59 of the closing membrane 52 (arrow X). On the other hand, since the contents penetrate the unevenness of the ridge 59 of the closing film 52 and penetrate into the barrier layer of the closing film 52, there is a drawback that the barrier layer of the closing film 52 is corroded (corresponding to the corrosion) Arrow Y).
(2) Furthermore, as shown in FIG. 13, since the shortest distance L between the barrier layer 54d of the body portion 54 and the barrier layer 52d of the closing membrane 52 is as large as 1.0 to 5 mm, the outside air that has passed through the tube shoulder 50 However, there was a defect that the contents flow into the tube from the gap L to alter the contents (arrow Z).
The present invention has been made paying attention to such problems, and provides a method for producing a closed membrane tube container excellent in storage stability of contents, which prevents permeation of outside air and penetration of contents. It is the purpose.

To solve this problem, it means for solving the problems described in claim 1, molded by drawing, with a closure film having a barrier layer, and an inner shoulder its closing film is deposited on the upper surface disc Generated by placing the member on the mandrel head, then dropping the annular shoulder material onto the hem of the inner shoulder, and pressing the shoulder material with an upper mold to form by drawing In the manufacturing method of the closed membrane tube container, the unevenness caused by the wrinkles of the closed membrane is filled with the shoulder material, and the tube shoulder is formed. Since the tube shoulder is formed by strongly pressing the annular shoulder material with the upper mold, the molten resin enters the irregularities of the ridges on the outer periphery of the closing film by the pressing force of the mold. And since the circumference | surroundings of the unevenness | corrugation of a soot can be filled with resin, it can prevent that external air flows in into a tube container along a soot. Further, it is possible to prevent the contents from entering the barrier layer through the soot.

According to a second aspect of the invention, there is provided a disk member having a barrier film having a barrier layer formed by drawing and an inner shoulder on which an upper shoulder is attached to the upper surface of the disk member on a mandrel head. The mandrel head is placed on the outer peripheral surface of the mandrel head to support a cylindrical portion of the laminated sheet rolled into a cylindrical shape, and then the annular shoulder material is dropped onto the hem of the inner shoulder, and the shoulder material is overcoated. By pressing with a mold, the unevenness caused by wrinkles of the closing film generated by the drawing process is filled with the shoulder material, a tube shoulder is formed, and the body portion is formed at the lower end of the tube shoulder, In which the shortest distance S between the barrier layer of the portion and the barrier layer of the closing membrane is 0 <S ≦ 1.0 mm.

  According to a third aspect of the present invention, there is provided a closed membrane tube container manufacturing method, wherein the barrier layer is made of an aluminum foil or a gas barrier resin.

  According to a fourth aspect of the present invention, there is provided a closed membrane tube container manufacturing method comprising a seam on the surface of the body portion.

According to a fifth aspect of the present invention , there is provided a closed membrane tube container manufacturing method characterized in that the surface of the body portion is seamless.

  According to the present invention, it is possible to prevent the permeation of the outside air into the contents and the penetration of the contents into the closing membrane, and it has an excellent effect on the storage stability of the contents.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  1 to 4 show a first embodiment of the present invention. FIG. 1 shows a manufacturing process in which a disk member 3 having a closure film 2 attached to the upper surface of an inner shoulder 1 is placed on a mandrel head 4. The inner shoulder 1 composed of the cylindrical portion 1a and the shoulder portion 1b is molded in advance with, for example, polyethylene resin, polypropylene resin or the like. The closure film 2 composed of the lid portion 2a, the cylindrical side wall portion 2b, and the umbrella-like skirt portion 2c is manufactured by drawing an aluminum plate material that has been cut into a disk shape in advance. The closing film 2 is made of an aluminum foil, a gas barrier resin material, or the like. In the case where the barrier layer 2d is an aluminum foil, a resin such as polyethylene is laminated on at least the front surface or the back surface thereof, and the welding with the inner shoulder 1 and the tube shoulder 5a becomes strong. The lower surface to be welded of the closing film 2 is heated to 150 to 250 ° C. and is welded onto the inner shoulder 1. FIG. 2 shows that the disc member 3 composed of the closure membrane 2 and the inner shoulder 1 is placed on the mandrel head 4 and the shoulder member 5 melted at 200 to 300 ° C. from above is used as the closure membrane of the disc member 3. It is drawing which shows the state which falls on 2. FIG. The shoulder material 5 has an annular shape in the first embodiment, but the shape can be arbitrarily selected. The shoulder material 5 is made of, for example, polyethylene resin, polypropylene resin, polyethylene terephthalate resin, ethylene-vinyl alcohol copolymer resin, or the like. A body 6 having a barrier layer 6a such as an aluminum foil is rolled and wound around the outer periphery of the mandrel head 4.

  FIG. 3 shows that a molten annular shoulder member 5 is dropped on a disk member 3 having a closure film 2 welded to the upper surface, and is pressed by a die 7 comprising a matrix and forming from above to form a tube shoulder 5a. To do. When the tube shoulder 5a is formed with a strong pressing force by the upper mold 7, the molten resin enters the periphery of the flange 2e of the closing film 2 as shown in FIG. , 2e can be completely embedded. That is, the inventor has found that the periphery of the unevenness of the heel 2e can be completely filled with the molten resin by strongly pressing the molten annular shoulder material 5 with the upper mold 7. As shown in FIG. 5, there is no gap between the tube shoulder 5a and the closing membrane 2, and it is possible to prevent outside air from flowing into the interior through the ridge. In the conventional known manufacturing method, when a disk member is simply welded to the inside of a previously formed tube shoulder, or when a molten resin is simply poured onto the disk member by injection molding to integrally mold the tube shoulder However, it was impossible to completely fill the unevenness of the ridges with the molten resin, and a gap was generated between the tube shoulder 5a and the closing membrane 2.

  Next, in Example 2 of the present invention, as shown in FIG. 6, the tube shoulder 5 a is molded, and at the same time, the body 6 is welded to the lower end of the tube shoulder 5 a by press molding with the upper mold 7. In the present invention, the shortest distance S between the barrier layer 6a such as an aluminum foil of the trunk portion 6 and the barrier layer 2d such as an aluminum foil of the closing film 2 is configured to satisfy 0 <S ≦ 1.0 mm. In the second embodiment, it is important to make the tube shoulder 5a thin. When the barrier layer 2d is an aluminum foil, the closing membrane 2 is formed by laminating a polyethylene terephthalate resin on at least one side and a polyethylene resin on the outside thereof, thereby facilitating the opening of the closing membrane 2 and the inner shoulder. 1 and the tube shoulder 5a can be firmly welded.

  In Example 2, the shortest distance S between the barrier layers is reduced to 1 mm or less as described above, so that outside air can be prevented from passing through the tube shoulder 5a and entering the contents. In addition, the barrier layer 2d of the closing film 2 may be made of a gas barrier resin such as an ethylene-vinyl alcohol copolymer, a nylon resin, a polyethylene terephthalate resin, or a polyacrylonitrile resin in addition to the aluminum foil. Similarly, the barrier layer 6a of the body portion 6 may be a gas barrier resin such as an ethylene-vinyl alcohol copolymer, a nylon resin, a polyethylene terephthalate resin, or a polyacrylonitrile resin in addition to the aluminum foil.

  FIG. 7 shows a third embodiment of the present invention, in which the umbrella-like skirt portion 12c of the closing membrane 12 is formed at a substantially horizontal position while being lifted slightly upward. Other configurations are the same as those of the first embodiment.

As shown in FIG. 8, the tube container manufactured by the above manufacturing method is formed by laminating a laminated sheet into a cylindrical shape, and welding each other by overlapping or abutting the end portions thereof. That is, the present invention can be applied to a general closed membrane tube container having a body portion 26 with a seam. As another embodiment, the present invention can be applied to a closed membrane tube container having a seamless body 36 as shown in FIG. Since the body portion 36 is seamless in appearance,
There are advantages that it is beautiful in appearance and does not need to specify the printing surface. The closed membrane tube container having the seamless body portion 36 is manufactured by a conventionally known manufacturing method.

  The manufacturing method according to the present invention can completely prevent the permeation of gas such as oxygen from the outside, and can prevent the corrosion of the closure membrane, so that it can prevent the deterioration of the contents in the distribution and sales process. it can. Further, even after opening, since it has a gas barrier effect at the screw part and the mouth part, it can be widely used as a closed membrane tube container for storing pharmaceuticals, foods, toothpaste, etc., and can be used in various fields.

Sectional drawing which shows the manufacturing process which shows Example 1 of the manufacturing method which concerns on this invention. Sectional drawing which shows the manufacturing process which shows Example 1 of the manufacturing method which concerns on this invention. Sectional drawing which shows the manufacturing process which shows Example 1 of the manufacturing method which concerns on this invention. Sectional drawing which shows the manufacturing process which shows Example 1 of the manufacturing method which concerns on this invention. The WW line expanded sectional view of FIG. 4 which is Example 1 of the manufacturing method which concerns on this invention. The expanded sectional view of the joint of the trunk | drum and the shoulder which shows Example 2 shape | molded with the manufacturing method which concerns on this invention. The expanded sectional view of the joint part of a trunk | drum and a shoulder which shows Example 3 shape | molded with the manufacturing method which concerns on this invention. Sectional drawing which shows the trunk | drum cross section of Examples 1-3 of the manufacturing method which concerns on this invention. Sectional drawing which shows the trunk | drum cross section of the other Example of the manufacturing method which concerns on this invention. Sectional drawing which shows the closure membrane tube container manufactured with the conventional manufacturing method. Sectional drawing which shows the manufacturing process of the closure membrane tube container manufactured with the conventional manufacturing method. Sectional drawing which shows the gas permeation | transmission state of the closed membrane tube container manufactured with the conventional manufacturing method. The expanded sectional view of the joint part of the trunk | drum and shoulder part of a closure membrane tube container shape | molded with the conventional manufacturing method.

Explanation of symbols

1 11 Inner shoulder 2 12 Closure membrane 2d 12d Barrier layer 3 Disk member 4 Mandrel head 5 Shoulder material 5a 15a Tube shoulder 6 16 Body 6a 16a Barrier layer 7 Upper mold 26 Closure membrane tube container 36 having a seam with seam Closed membrane tube container S with a seamless body

Claims (5)

Molded by drawing, a closed film having a barrier layer, a disk member provided with an inner shoulder its closing film is deposited on the upper surface, it is placed on the mandrel head,
Next, the annular shoulder material is dropped onto the hem of the inner shoulder,
The closure membrane tube is characterized in that the shoulder material is pressed by an upper mold to fill the unevenness caused by the wrinkle of the closure membrane generated by the drawing process with the shoulder material and the tube shoulder is molded. Container manufacturing method.
Molded by drawing, a closed film having a barrier layer, a disk member provided with an inner shoulder its closing film is deposited on the upper surface, it is placed on the mandrel head,
On the outer peripheral surface of the mandrel head, a cylindrical part rolled up in a cylindrical shape is supported,
Next, the annular shoulder material is dropped onto the hem of the inner shoulder,
By pressing the shoulder material with an upper mold, the unevenness caused by wrinkles of the closing film generated by molding by drawing is filled with the shoulder material, and a tube shoulder is molded,
The closed membrane tube is characterized in that the barrel is welded to the lower end of the shoulder of the tube so that the shortest distance S between the barrier layer of the barrel and the barrier layer of the closure membrane is 0 <S ≦ 1.0 mm. Container manufacturing method.
The said barrier layer is comprised with aluminum foil or gas barrier resin, The manufacturing method of the closure membrane tube container of Claim 1 or 2 characterized by the above-mentioned. The method for manufacturing a closed membrane tube container according to any one of claims 1 to 3 , wherein a seam is provided on a surface of the body portion. The method for manufacturing a closed membrane tube container according to any one of claims 1 to 3 , wherein a surface of the body portion is seamless.

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