JPH0437765B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a lid for a beverage container that is opened by pulling up a pull ring.

BACKGROUND OF THE INVENTION Pull tabs are often used to open containers made of paper, plastic, aluminum, or composite materials, primarily for beverages. That is, the drinking spout provided on the lid is covered with a pull tab and sealed by heat sealing or the like, and the drinking spout is opened by pulling up and peeling off the unadhered end of the pull tab.
This method is excellent in easy openability. However, if the cut surface of the hole in the lid is left exposed, it may be corroded by the contents.
The liquid may seep in and cause delamination. In order to enable long-term distribution of beverage packaging at room temperature,
Up until now, countermeasures have been taken such as heat-sealing a polyethylene film from the inside of the drinking spout or coating it with molten polyethylene.

However, all of these cut surface protection measures require additional steps, complicating the manufacturing or packaging operations of beverage containers.

The present inventor has devised and separately proposed an easy-opening beverage container that solves these problems and has a structure that does not require a special process to protect the cut surface while maintaining ease of opening. The beverage container is made of AI/PE, as shown in Figures 1 and 2.
A sheet having two layers (the former is indicated by 21 and the latter is indicated by 22) is used as the lid material 2 with the PE layer on the inside, and the AI layer 21 is completely cut to a depth that reaches a part of the PE layer 22. A half cut 5 having the shape of the drinking spout 3 is provided, a hole is made at one end of the drinking spout 3, and a claw 41 provided on a PE pull ring 4 having the shape shown in FIG. 2 is inserted into the hole. Lid 2 made by fixing the pull ring by melting the edges
It is characterized by having the following.

In the above container manufacturing process, it is time-consuming to insert the claw of the pull ring into the hole of the drinking spout and melt the tip. The present invention improves this point and provides a manufacturing method with increased productivity by simultaneously forming and fixing the pull ring in-line following the formation of the half cut.

To explain the manufacturing method of the easy-opening container lid of the present invention using PE as the synthetic resin, as shown in FIGS. 3 and 4, two layers of AI/PE (the former is 21, and the latter is 22.
) is used as the lid material 2 with the PE layer on the inside, and is first placed in the press mold 7.
The AI layer 21 is completely cut to provide a half cut 5 having the shape of the spout 3, which is deep enough to reach a part of the PE layer 22, and a hole 6 is made at one end of the spout 3, and then an injection molding machine is used. 81 and an injection mold 82 to inject PE over both sides of the hole 6,
A pull ring 4 having a fixing piece 41 fused to the PE layer 22 is formed on the side of the AI layer 21, and finally, this sheet is punched out in the shape of the lid material 2 using a punching die 9.

The sheet with half cuts and holes formed is as shown in FIG. 5, and the sheet with the pull ring formed by injection molding is as shown in FIG. 6.

The material of the lid is, in short, a completely cut aluminum layer, and if there is an innermost PE layer with a half-cut reaching part of its thickness, then another layer is laminated. There is no problem.
The inner PE is an example of synthetic resin, for example
Of course, other heat-sealable synthetic resins such as PP may also be used. In this case, it is preferable to use a synthetic resin of the same quality for the pull ring. When the aluminum layer is exposed to the outside, it is best to apply a corrosion-resistant coating, but in either case, the synthetic resin should be in a pseudo-adhesive state so that the injection-molded synthetic resin pull ring can be easily peeled off from the surface during use. should remain at that point.

To give an example of the structure of the lid material and the actual half-cut, in a laminated material of AI (130μ) + PE (80μ), a half-cut is given to the PE layer with a depth in the range of 10 to 70μ. That is, the PE layer is left with a thickness of 70 to 10 microns.

For the lid material, if it is a flat type that is combined with a body material that has a flange, you can use the above-mentioned punching method, but if the lid material is a type that is bent at the edges and glued to a cylindrical body material, it can be used after punching or after punching. At the same time, it is a good idea to add a step to the line to fold the edges.

A beverage container using the lid manufactured by the method of the present invention can be obtained by pulling up the pull ring provided above the drinking spout as described above, inserting your finger and pulling it up.
The PE layer is cut along the half-cut, and the laminated material in that area is removed along with the pull ring, opening the drinking spout.

According to the present invention, for example, by using a lid material made of half-cuts of a predetermined depth in the original AI/PE fabric, the troublesome steps of sealing a protective film and applying a protective coating, which were conventionally performed, can be omitted. The benefits of the above-mentioned lids being able to be used are greatly increased, making the production of beverage containers extremely efficient and reducing costs.

[Brief explanation of drawings]

1 and 2 are for explaining the main parts of the easy-opening beverage container devised by the present inventor; FIG. 1 is a plan view, and FIG.
The figure is a sectional view taken in the - direction of FIG. 1. 3 and 4 conceptually show the steps of the method for manufacturing a lid material of the present invention, where FIG. 3 is a cross-sectional view and FIG. 4 is a plan view of a sheet of the lid material. . Fifth
Figure 6 and Figure 6 are enlarged sectional views of the sheet of lidding material, Figure 5 showing the stage where the half cut and hole of the drinking spout are provided, and Figure 6 showing the stage where the pull ring is formed by injection molding. . 1... Beverage container, 2... Lid material, 21... AI,
22...PE, 3...spout, 4...pull ring,
41... Fixed piece, 5... Half cut, 7... Press die, 81... Injection molding machine, 82... Injection mold, 9... Punching die.

Claims (1)

[Claims] 1. A sheet having at least two layers of AI/PE is used with the synthetic resin layer on the inside, and the AI layer is completely cut to a depth that reaches a part of the synthetic resin layer. In addition to providing a half cut in the shape of a spout, a hole is made at one end of the spout, and synthetic resin is injection molded over both sides of the hole, and a pull ring with a fixing piece fused to the synthetic resin layer is attached to the AI layer. 1. A method of manufacturing an easy-opening beverage container lid, comprising forming the sheet on the side and then punching this sheet into the shape of the lid. 2. The manufacturing method according to claim 1, which includes a step of bending the edge of the lid material for adhesion to the body material after or simultaneously with the punching.