JP2541235B2 - Method of manufacturing gas barrier molded lid material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a gas barrier molding lid material for producing a lid for a container, which is obtained by laminating a multilayer film on a resin or the like.

[Prior Art] Usually, a lid with a pull ring is fitted into the mouth of a container for beverages, seasonings or the like, and the pull ring is easily opened by pulling. The lid with the pull ring is
Due to the storability of the contents, a high gas barrier property (gas barrier property) that blocks gas without substantially permeating it is required. Therefore, polyethylene resin liquid is injection-molded onto a multilayer film made by laminating an aluminum foil and a polyethylene thin film. Is made. In such a lid, in order to prevent corrosion of the end faces of the aluminum foil and peeling between layers due to the action of the contents, it is necessary to have a structure in which the end faces of the film material do not come into contact with the contents.

When manufacturing a lid with a pull ring by the conventional gas barrier molding lid material manufacturing method, a multilayer film is punched into a face shape (circular shape), deep-drawn into a concave cross-sectional shape, and then used for injection molding. Insert into the mold and injection mold the resin on the concave surface of the film.

[Problems to be Solved by the Invention] However, in the conventional method for manufacturing a gas barrier molding lid material, a multilayer film as an insert material is once cut into a face shape and deep drawing is performed, and then the gold film is formed. In order to set in the mold, a deep-drawing molding device and a mold setting device are required, which increases equipment costs. In particular, in the case of small-volume production, the equipment cost will occupy most of the whole, resulting in high cost. Further, since the face-shaped film is set in the mold, the cycle time for manufacturing becomes long and the manufacturing cost rises. Furthermore, if the film is soft, the film will be damaged or deformed during setting and transportation, so in order to prevent a decrease in yield,
There is a problem that attention must be paid to the transportation and packaging of the film.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for manufacturing a gas barrier molding lid material that can reduce equipment costs, manufacturing costs, and packaging / transportation costs.

[Means for Solving the Problem] The method for producing a gas barrier molding lid material according to the present invention comprises:
A perforation for cutting is formed in advance at a suitable place of a gas barrier film material that is continuous in a band shape that blocks gas without substantially permeating it, and this is continuously fed to a molding die having a male die and a female die. Then, the area surrounded by the perforations is pressed against the female die by the male die and punched into a face shape, and at the same time, the resin is injected from the male die to one side of this face-shaped gas barrier film material to form the gas barrier film material. It is characterized in that the resin and the gas barrier film material are integrated at the same time when the resin is molded into a concave cross section.

[Operation] In the method for producing a gas barrier molding lid material according to the present invention, first, perforations are formed at appropriate places of the gas barrier film material which is continuous in a strip shape. Next, the gas barrier film material is continuously fed to a molding die having a male die and a female die, the male die is pressed against the female die, and an injection molding raw material is injected from the male die. As a result, the strip-shaped gas barrier film material is broken at the perforations, and the film material cut into the face shape is pushed into the female mold. At this time, the face-shaped film material is molded into a concave shape in cross section by the flow of the injected resin and the injection pressure, and a molded product including a resin pull ring is formed on the concave surface of the film material.

Since the film material is preliminarily perforated before injection molding and is cut off from the perforated portion and injection-molded, a resin molded product is also formed on the end surface of the cut film material. For this reason, the cut-off end surface of the film material is not exposed on the concave surface side, and the contents are excellent in preservability so that the cut-off end surface of the film material does not come into contact with the cut-off end surface.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 is a schematic view showing in section a part of an apparatus in which the method for producing a gas barrier molding lid material according to an embodiment of the present invention is used, and FIG. 2 is a plan view showing a perforated film material. FIG. 3 is a partial cross-sectional view of the molding die. The gas barrier film material 16 (hereinafter simply referred to as a film material) of the supply roll 10 is a drag roll 12 and a dancer roll 14
It is adapted to be wound around the winding roll 18 with a predetermined tension via the. The film material 16 has a three-layer structure in which an aluminum foil is sandwiched between polyethylene thin films, and is formed with a substantially uniform width. Perforation processing device 20 supply roll
The film material 16 is arranged between the pressing member 23 and the receiving member 27 disposed on the side of the film member 10. Member 23
Is connected to the piston rod of cylinder 22,
Thereby, the member 23 moves back and forth toward the film material 16. Further, a plurality of small projections 24 are arranged in a circular shape on the front surface of the member 23, and the pressing member 25 is supported by the spring 26 so as to surround the small projection 24, and the member 23 is pressed against the member 27. The member 25 fixes the film material 16 with an appropriate force, and the small projection 24 forms a circular perforation 17 in the width center of the film material 16 as shown in FIG. .

The injection molding die 30 is provided on the downstream side of the perforation processing apparatus 20. The die 30 has a male die 31 and a female die 36 facing each other, and the film material 16 is fed between the male die 31 and the female die 36. A resin liquid injection device (not shown) is provided on the rear surface side of the male die 31, and the liquid supply port is connected to the passage 32 in the male die 31. Passage 32 is male 31
It branches inside and opens toward the female mold 36 at a plurality of injection ports 33. Further, the branch passage 32a in which the pull ring is formed is formed in the sliding member 35 so that the sliding member 35 retracts into the male mold 31 when the internal pressure of the mold rises. On the other hand, a cavity 37 is provided in the front surface of the female die 36, and the tips of the plurality of pins 38 project from the cavity 37 toward the male die 31. That is, the pin 38 is slidably accommodated in the female die 36, and the rod of the air cylinder 39 is connected to each pin 38. In addition, the knockout pin 40 is pinned through the rod of each air cylinder 39.
If it is provided on the 38, the pin 38 can be more surely projected toward the male die 31.

As shown in FIG. 3, a protrusion 42 is formed so as to surround the convex portion of the core 34. When the male die 31 is pressed against the female die 36,
The projection 42 is brought into contact with the cavity 37 so that the facet-shaped film material 16a is cut off at the perforations 17.

A constant-size feeding device 50 is provided between the die 30 and the winding roll 18, and the feeding of the film material 16 is adjusted in cooperation with the scrap winding roll 18. The constant-size feeding device 50 is configured to intermittently feed the film material 16 by a predetermined length, and is connected to a part of the mold 30 by a member 48, and the mold 30 and the constant-size feeding device 50 are connected to each other. Are linked together. In addition, the perforation processing device 20 is also adapted to interlock with the die 30 and the constant-size feeding device 50. That is, when the film material 16 is clamped by the clamps 52, 54 of the constant-size feeding device 50, the winding roll 18 is stopped at substantially the same time,
The perforation processing device 20 and the mold 30 are operated.

Next, the operation of this embodiment will be described. With the lid manufactured by the previous operation, pin 38 is projected and the cavity
Remove from 37. After feeding the film material 16 by a constant length feeding device 50 by a predetermined length, the feeding of the film material 16 is stopped,
The perforation processing device 20 and the mold 30 are operated. This allows the film material 16 to be pre-perforated and the die 30
Inside, the film material 16 is cut and deep-drawn into a face shape.
That is, in the mold 30, the protrusion 42 of the male mold 31 is replaced by the female mold.
The film material 16 is cut at the perforations by abutting against the cavity 37 of 36, the pin 38 is slightly projected from the cavity 37, and the face-shaped film material 16a is sandwiched by the pin 38 and the core 34 of the male die 31 to form the cavity 37. Push it into the recess. Next, the heated and liquefied polyethylene resin liquid is injected from the injection port 33 through the passage 32 at a predetermined pressure.
The film material 16a is pressed by the liquid pressure, and the cavity 37
Stick to. When the hydraulic pressure rises, the member 35 slides to form a void in a portion corresponding to the pull ring, and the pull ring is formed here. The resin liquid cools and solidifies upon contact with the mold. As a result, the film material 16a is formed into a concave cross section and is integrated with the resin. Next, the male die 31 is separated from the female die 36, and the pin 38 is projected by the air cylinder 39 to remove the product (lid) closely attached to the cavity 37. In this case, if the knockout pin 40 is used, the product can be removed more reliably.

As shown in FIG. 4, the manufactured lid 60 is a film material.
A polyethylene resin portion 62 having a predetermined shape is provided inside the 16a, and a pull ring 63 is projectingly provided on this resin portion 62, and a notch 64 is formed so as to surround a main portion of the pull ring 63.

According to the above-mentioned embodiment, the process of feeding the film material 16, the perforation process, the cutting process, the resin liquid injection process, the molding process, and the product removal process are systematically linked so that the raw material is changed to the product. It was possible to shorten the cycle time to reach the end and to dramatically improve production efficiency.

[Effects of the Invention] According to the present invention, it is possible to dispense with a large-scale setting device and a deep-drawing forming device, so that it is possible to significantly reduce equipment costs. Further, the cutting / deep drawing process and the injection molding process can be simultaneously performed in one process, so that the cycle time required for the manufacturing can be shortened, the yield can be improved, and the manufacturing cost can be reduced. You can Further, since it is not necessary to convey the separated film material to another place, the packaging cost and the transportation cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic view showing in section a part of an apparatus in which the method for producing a gas barrier molding lid material according to an embodiment of the present invention is used, and FIG. 2 is a plan view showing a perforated film material. FIG. 3 is a partial cross-sectional view of the molding die, and FIG. 4 is a vertical cross-sectional view of the manufactured lid with the pull ring. 10,12,14,18; Roll, 16,16a; Gas barrier film material, 20; Perforation processing device, 30; Injection molding mold, 31; Male mold, 32; Injection liquid passage, 34; Core, 36 Female, 37; Cavity, 38; Pin, 22,39,51; Cylinder, 40; Knockout pin, 50; Feeder, 52, 54; Clamp, 60; Lid, 63; Pull ring, 64; Notch.

Claims (1)

(57) [Claims] 1. A molding die having a male die and a female die, in which a perforation for cutting is formed in advance at a suitable position of a gas barrier film material which is connected in a strip shape and which substantially blocks gas without permeation. Continuously, the area surrounded by the perforations is pressed by the male die against the female die to punch it into a face shape, and the resin is injected from the male die to one side of this faceted gas barrier film material. A method for producing a gas barrier molding lid material, which comprises molding the gas barrier film material into a concave cross section and at the same time integrating the resin and the gas barrier film material.