JPS6131228A - Manufacture of moisture proof packaging container body - Google Patents

Abstract

PURPOSE:To contrive to form a container, while stretching remarkably the unbroken layer of thermoplastic synthetic resin and breaking no metallic foil by forming underheating the laminated layer containing the metallic foil in which necessary breaking lines with blank shapes are provided. CONSTITUTION:When the synthetic resin film 2 of the laminated sheet A caught in between a die 11 and a drease pushing plate 10 is softened by heating and a punch is pushed, the film 2 is formed with bulging. As the position corresponding to the portion where the breaking lines of the metallic foil are provided, is especially stretched remarkably, the metallic foil 1 is drawn with the film 2 along the die 11, and annular grooves 14 are formed by ribs and the broken ends of the breaking line L around a circular depression 17. Even if the grooves 14 are formed, resin does not adher to the crease pushing plate 10, and the container body 10 may be easily produced by continuously repeated forming. After the depression 17 has received a content G, it is sealed with the cover 20 is which a foil 15 is coated with a heat sealing adhesive 16. thus, a packaged product is obtained.

Description

Detailed Description of the Invention A. Field of Industrial Application The present invention provides a packaging container having a high degree of moisture resistance by using a laminated sheet in which one or more thermoplastic synthetic resin films are laminated on one or both sides of a metal chain. The present invention relates to a method of manufacturing a main body by drawing.

mouth, conventional technology Packaging containers with moisture resistance of 114 degrees are used for pharmaceutical tablets.

It is used to package foodstuffs, precision mechanical parts, and other moisture-repellent contents. These and packaging containers are not individually layered one by one, but are generally formed in large numbers at the same time and used as is.

Conventionally, the body of this type of moisture-proof packaging container has been made of a single thermoplastic synthetic resin film having moisture-proof properties, or a resin film coated with, for example, vinylidene chloride resin to make it moisture-proof, and then softened by heating. Many pieces were molded at the same time using immersion, pressure forming, or vacuum forming methods.

These molding methods are a type of stretch molding, and materials that can be heated and softened and stretched by more than 200%, such as thermoplastic synthetic resin films, can be molded. It was hard to say that it was enough to get it.

- In order to improve the moisture resistance of a universal plastic synthetic resin film, metal foil is laminated. However, this laminated sheet has a maximum elongation rate of about 30%, so It was not possible to obtain a molded container without breaking it.

In order to eliminate this drawback, Japanese Patent Publication No. 52-39859 uses a laminated sheet in which a thermoplastic synthetic resin film and a metal foil are bonded together via a hot melt adhesive layer, and the metal foil is cut into blank shapes. A method has been proposed in which a moisture-proof packaging container body is formed by heating this to soften the true-melt adhesive layer and drawing the blank portion.

According to this method, a thermoplastic synthetic resin film laminated via a heat-softened hot-melt adhesive layer and a blank-shaped metal foil are drawn and formed, so that the container body can be formed without breaking the metal foil. Molded to provide a high degree of moisture resistance.

By the way, when manufacturing a moisture-proof container body by drawing according to this method, the laminated sheet is held between a die and a holding plate except for the packaging position of the laminated sheet,
By applying a punch to the packaging position, the laminated sheet is squeezed between the die and the punch. The wrinkle suppressing plate is provided to hold the laminated sheet while preventing wrinkles from being generated in the vicinity of the drawn portion of the laminated sheet due to plastic working.

C1 Problems to be Solved by the Invention In the above method, when the metal foil cut into a blank shape is squeezed, the hot melt adhesive layer is exposed due to the movement of the edge of the metal foil at the cutting line part, and the wrinkle holding plate is The hot melt adhesive extruded by pressure adheres to the wrinkle presser plate, and when the presser plate separates from the laminated sheet surface at the end of molding, it pulls a thread, and as the molding is repeated, the amount of adhesive increases, and finally the lamination There was a problem in that it adhered adversely to the sheet, making continuous repeated molding difficult.

21 Means and Effects for Solving the Problems In view of the above points, the present invention provides a laminated layer in which a hot melt adhesive layer is not provided when providing one or more thermoplastic synthetic resin layers on at least one side of a metal foil. Using a sheet, cut it on one side.
Cutting lines in the desired blank shape are cut into the other layers including the metal foil so that at least one thermoplastic synthetic resin layer that does not contain FiPIa remains, and the thermoplastic synthetic resin layer is heated to sufficiently soften it, and the above-mentioned molding is performed. By molding in the same manner as in the method, the uncut thermoplastic synthetic resin layer corresponding to the cutting line stretches significantly, and the metal foil can be molded without breaking.

Therefore, the above-mentioned problems caused by the conventional hot melt adhesive adhering to the wrinkle presser plate can be avoided.

E, Example Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a plan view of an 8i layer sheet A for the main body of a packaging container, and Fig. 2 is a sectional view taken along the line 1-1 in Fig. 1. It is laminated with a polyvinyl chloride film 2 with a diameter of 70 to 200μ, and a cutting line is punched only in the aluminum foil 1, leaving the film 2, and the diameter is 20 to 30μ.
11 circular blanks A' are formed.

FIGS. 6 and 7 are cross-sectional views schematically showing the forming process, in which the laminated sheet A is placed on the die 11 so that the blank A' is at the required position and the two sides of the polyvinyl chloride film are in contact with each other. , and held under pressure with the wrinkle presser plate 10.

The die 11 and the wrinkle presser plate 10 are heated to a temperature of 180 to 200°C at which the polyvinyl chloride film 2 can be softened. The film 2 is heated and softened, and when the punch 12 is pressed in this state, the polyvinyl chloride film 2 is stretched and formed, and the part corresponding to the cutting line of the aluminum foil is particularly stretched, so the aluminum foil 1 is squeezed together with the polyvinyl chloride film 2 along the die 11, and an annular groove 14 is formed by the rib around the circular recess 17 and the cut end of the aluminum foil 1 cut 1iiIL.

According to the above method, since there is no hot melt adhesive layer in the laminated sheet A, even if the annular groove portion 14 is formed,
There is no resin adhesion to the holding plate 10, and the moisture-proof packaging container main body as shown in the plan view of FIG. 3 and the sectional view of FIG. 4 can be easily manufactured by continuous repeated molding.

The circular concave portion 17 described above serves as a storage portion for the contents, and as shown in the 51st sectional view, after accommodating the contents G, a lid is formed by applying a heat-sealable adhesive 16 to the aluminum foil 15. A package is obtained by sealing with material 2o.

In the above embodiments, a two-layer laminate sheet A consisting of aluminum foil 1 and polyvinyl chloride film 2 was used. However, a thermoplastic synthetic resin film as shown in the cross-sectional view of FIG. A laminated sheet provided on both sides may be used, for example, a polychloride film 2 with a thickness of 200 μm, an aluminum foil 1 with a thickness of 40 μm, and a laminated sheet with a thickness of 9 to 30 μm.
A multi-layered sheet B laminated with a polyvinyl chloride film 3 of μ is used. In this case, the two-layer laminated sheet A
The thickness of the aluminum foil 1 can be made thinner than in the case of .

When using this multiple laminated sheet 1B, cutting IsL is made only in the polyvinyl chloride film 3 and the aluminum foil 1 to form a predetermined blank shape and molding is performed in the same manner as in the previous example. Since the aluminum foil 1 is laminated with polyvinyl chloride films on both sides, its elongation rate increases and it becomes less prone to breakage, making deeper drawing possible.

Furthermore, in addition to the laminated sheets A and B, a four-layer multi-laminated sheet C as shown in the sectional view of FIG. 9 may be used. For example, a 100μ thick polyethylene film 4 is placed between a 30μ thick aluminum foil 1 and a 100μ thick polyvinyl chloride film 2! 9 on the other side of aluminum foil 1
The moldability is further improved by using a laminated sheet C laminated with a polyvinyl chloride film 3 of ~30 μm.

In this case, cutting the polyvinyl chloride film 3 as shown in FIG. 9a. An example in which the polyvinyl chloride film 2 and the polyethylene film 4 are stretched significantly during molding when only the aluminum foil 1 is inserted, and a laminated sheet A in which a cutting line is further inserted up to the polyethylene film 4 as shown in Figure 9. Similarly, there is an example in which the polyvinyl chloride film 2 is stretched significantly during molding, and the thickness of the polyethylene film 4 is 70 to 200 μm in the former case, and 9 to 30 μm in the latter case.
The range of μ was appropriate.

In the above examples, as the thermoplastic synthetic resin film,
Although polyvinyl chloride and polyethylene were used, polypropylene, polyester, polycarbonate, ionomer, polyamide, ethylene-vinyl acetate copolymer, etc. can also be used, and if two or more layers of thermoplastic synthetic resin films are used, they can be of the same or different types. There is no problem even if there is one, and it can be selected as appropriate.

Further, as the metal foil, foils of tin, copper, iron, etc. can also be used instead of aluminum foil.

Effects As mentioned above, in the present invention, cutting lines of the required shape reaching the metal foil of the laminated sheet without the hot melt adhesive layer are inserted, and the uncut thermoplastic synthetic resin film layer is cut.
Since drawing is performed using elongation, it is possible to use thin metal foil, and the packaging container body has a high degree of moisture resistance without causing the conventional problem of resin adhesion to the wrinkle presser plate. It can be molded continuously and repeatedly.

[Brief explanation of drawings]

Figure 1 is a plan view of the laminated sheet, Figure 2 is Figure 1 I-NI
3 is a plan view of the container body after molding, FIG. 4 is a sectional view taken along the line ■-■ in FIG. 3, FIG. 5 is a sectional view of the package after containing the contents, and FIG. 7 are explanatory cross-sectional views showing the molding process, and FIGS. 8 and 9 are cross-sectional views showing other examples of the laminated sheet. 1... Aluminum foil 2.3... Polyvinyl chloride film 4... Polyethylene film 10... Wrinkle press plate 11... Die 12... Punch 14... Annular groove 17... Circular Concave portions A, B, C... Laminated sheet A'... Blank board 1-... Cutting line Figure 1, Group 3, 5th layer

Claims (1)

[Claims] For a laminated sheet in which one or more thermoplastic synthetic resin layers are provided on at least one side of metal foil, the other layers including the metal foil are coated with the necessary thickness so that one or more thermoplastic synthetic resin layers with no cut lines remain on one side. A moisture-proof packaging container body characterized by inserting a cutting line in the shape of a blank, heating the laminated sheet while sandwiching the area around the cutting line to soften the thermoplastic synthetic resin layer, and then drawing-forming the blank part. manufacturing method.