JPS59142953A - Manufacture of hermetically sealable cover - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a hermetic lid in which an impermeable foil is interposed between an outer base material made of a thermoplastic resin or a composite material thereof and an adhesive sheet of synthetic resin. It is something.

Containers for storing food products in a hermetically sealed manner include tin cans, aluminum cans used for beer, glass bottles, plastic bottles, and other containers.

A cup or the like is used.

However, the metals mentioned above may be leached over time, glass bottles are easily damaged by car damage, and glass bottles are prone to oxidation and deterioration of the contents due to oxygen permeable mud. It has drawbacks such as not being able to withstand storage.

For this reason, a composite can made of a combination of plastic and impermeable foil is being considered.

Can bodies can be manufactured by wrapping an impermeable foil around the outer circumference of an extruded synthetic resin product with a cylindrical cross section, by laminating an impermeable foil onto a cylindrical injection molded product, or by injection molding. If necessary, set impermeable foil in the mold in advance.
When molding, there is a method of adding layers to the entire molded product. As the impermeable foil used above, aluminum foil is usually used from the viewpoint of performance, cost, formability, etc.

Incidentally, an upper lid and a lower lid (hereinafter collectively referred to as lids) are attached to the body, but these lids must also have an impermeable foil layer.

However, the method of manufacturing a lid having a structure and shape that satisfies the above requirements required manual labor and was not satisfactory.

In view of the above-mentioned desire for intoxication, the present invention provides a layer of impermeable foil with a layer of ``AI'' and gold), and a hermetic lid that does not have 4 to 11 minutes as a first gift for a guest. ) The aim is to provide a simple manufacturing method, and the purpose of the seventh is that the adhesive sheet as the layer, the impermeable foil as the intermediate layer and the hot hole Jγij as the outer base layer. The present invention provides a method for producing a sealable lid, which uses a plastic sheet and press-forms it in seven stages or one or more stages using a cut-out mold.

The method of the present invention will be explained below with reference to the drawings.

FIGS. 7 and 2 are longitudinal sectional views of an example of a lid formed by the method of the present invention.

The lid usually has a circular planar shape, but depending on the shape of the body to which it is attached, it can also be rectangular or oval with rounded edges.

The peripheral edge 2 of the lid 1 is provided with a recess 4 for positioning when attached to the body 3, an upper tjL recess 41d, an inclined portion 5 and a vertical portion as shown in an enlarged view in FIG. 6 and the westward part 7.

The above-mentioned inclined portion 5 is firmly fitted to the body portion 3, and the vertical portion 6 is connected to the body portion 3, which is also vertical. '? 153, the protruding portion 6 is most strongly fused to the end surface of the body 3. The thickness 6a of the vertical portion 6 of the lid 1 is
In view of sealing the body 3, it is preferable that the length 3a is slightly thinner.

As shown in FIG. An inner adhesive is provided on the outside of the adhesive foil layer 13, that is, on the surface that corresponds to the inside of the can, to prevent the contents from coming into contact with the impermeable foil and to perform fitting and adhesion between the lid 1 and the body 3. It is composed of a laminate with a flexible sheet layer 14.

The material for the outer base layer 111ri is, for example, a composite of high-density polyethylene, polypropylene, polypropylene and fillers such as talc, charcoal, clay, etc. Polypropylene is preferable from the viewpoint of heat resistance and rigidity. . The thickness of the outer base material layer 11 is θj−1! It is about rran.

The adhesive layer 12 and the inner π adhesive sheet layer 14 are preferably made of resin with excellent adhesiveness, such as modified polyolefin with unsaturated carboxylic acid or its anhydride, low density polyethylene, ethylene-propylene copolymer, etc. Its thickness is 2
It may be 0 to θ, μ4, II5. 1. As a non-transparent foil, aluminum foil is preferably used in terms of low cost, formability, etc., and its thickness is j~30μ)l' ,! An l branch is fine.

Jorogai Senno, (with the thickness of the layer 11 and the impermeable foil layer 13,
The strength of the above-mentioned 'At(l) molded by the mortar body is expressed by the internal pressure required for the can VC, which is composed of the right-hand side, the filler part 1, and the body part 3. Strength, shape retention, etc. are determined by 1. Also, if the contact between the outer base layer 11 and the impermeable foil layer 13 is good, the adhesive layer 12 may not be used.

Next, a method for producing the above-mentioned treasured kufufusoku according to the present invention will be explained and explained.

The manufacturing method is to apply a resin having excellent adhesive properties such as unsaturated carboxylic acid to an outer base material of a certain thickness such as polypropylene or a polypropylene base material, such as a polyolefin modified by unsaturated carboxylic acid or its anhydride. ,, Ho' I
J 1 tyrene, ethylene-propylene copolymer, etc. ii
i + i Use the bonded laminated sheet when sheeting the laminated impermeable foil (for example, aluminum foil) 1. Blank (circle) [〉 or oval shape, etc.] the above laminated sheet in advance. Punch out the 31st y (1 wjl on i)
A charge is applied between the mold 21 consisting of male molds 21a and 21b to apply pressure. Alternatively, molding may be carried out at the same time as cutting out using a mold that can be used to supply the laminated sheet.

When the base material is polypropylene, the above-mentioned laminated sheet or its blank is maintained at a temperature of 10θ℃ or higher and below the melting point before pressure molding, to facilitate plastic deformation during pressurization and to prevent lamination. It facilitates handling of seats or ranks. - The pressurizing force in the case of self-pressure molding of the upper gate is usually θO~/000 parts Kg/CTl. When charging a laminated sheet or a blank into a mold, the mold must be charged so that the impermeable foil becomes IRQ.

- The mold is heated to an appropriate temperature of jθ to 0°C.

In the present invention, the gold used in the above molding is referred to as a cutting mold, but a special compression molding mold is used.
Te a) + S, dD + - Jjl - Sliding parts 22σC clearance of molds 21a, 21b trd, 0.0.2 - or less, forming a bond 1, i≦1゛, leaving the peripheral part. It's like 4'41;
: There is no need to provide a separate step and the pressure is sufficient (/'C
It is transmitted.

Polypropylene or its composite material punched into a blank such as a star circle or a stone circle is charged into the outer base 1-cutting mold 21, which is heated to an appropriate temperature, and then the male and female molds are pressed. Touch the 1iti surface before stamping
It is also possible to supply an impermeable foil laminated with a transparent sheet and pressurize it as it is to bond the impermeable foil at the time of forming the lid 1 and forming the lid 1. In this case, the molding conditions such as blank temperature and pressing force are the same as in the above method.

Extruded pots are made by punching out an oval shaped blank or other outer rod made of polypropylene or a composite thereof, heated to an appropriate temperature to facilitate plastic flow, and then molded with a cut-out mold.
: After molding and shaping into the shape of the lid, there is also a method of adhering an impermeable foil that is pressure-formed again and laminated with a handleable sheet on both sides to the outer base material in the shape of the above. . In this case as well, the molding conditions such as blank quality and pressing force are the same as in the above method.

The can is completed by fusing the upper and lower lids formed by any of the above methods to the upper and lower opening ends of the body. For example, in the case of a circular shape, spin weld ink is used to bond the upper and lower lids. Incidentally, the contact Mf of the upper lid is naturally performed after filling the contents.

In the above description of the manufacturing method, an adhesive sheet is always laminated on both sides of an impermeable foil (for example, aluminum foil). If the adhesive sheet has good properties, an adhesive sheet is laminated on one side of the impermeable foil 13, and the outer base layer 11 and the impermeable foil are laminated so that the adhesive sheet layer 14 formed by the lamination becomes the inner surface of the lid 1. 13 may be bonded to 11w.

As mentioned above, the method for manufacturing breakable sex products according to the present invention is as follows:
Since the outer base material, impermeable foil, and inner adhesive are laminated and molded using a cut-out mold, it is lightweight, does not allow oxygen to permeate through it, and has excellent sealing properties that prevent the contents from coming into contact with metal. It has the advantage of being cheap to manufacture and can be hung.

[Brief explanation of drawings]

? ('/The figure is a vertical cross-section m1 of the lid manufactured by the method of the present invention, Figure 2 is an enlarged view of the edge of Figure 1, Figure 3 is an enlarged view of the edge of Figure 1,
FIG. 2 is a longitudinal cross-sectional view of a cutting die for carrying out the method of the present invention. 1... vessel, 2... periphery, 4...
...Concave part, 5... Slanted part, 6-... Vertical part, 7... Sudden sound Jll... Outer (fl
ii base material layer, 12...adhesive layer, 13...
... Impermeable foil layer, 14... Adhesive sheet layer,
21...Gold 1-B 21a...Female mold, 21b...Male mold, 22...Sliding portion of male and female molds.

Claims (1)

[Claims] It is characterized by pressure molding using an adhesive sheet as an inner layer, an impermeable foil as an intermediate layer, and a thermoplastic resin sheet as an outer base material layer in 7 stages or 2 stages or more using a cut-out mold. A method for manufacturing a hermetic lid,