JPH0126627Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to a partition plate for cans that prevents oxygen from permeating and allows predetermined cutting.

(Prior art and its problems) Conventionally, sealed packaging forms have been known in which a transparent film is stretched over the mouth of a can so that the inside can be seen through, but the transparent film in this case mainly contains oxygen. Along with the need for a function to prevent penetration,
It is desired that the seal can be easily broken when the seal is broken. In order to prevent oxygen permeation, a technique is known that uses an ethylene vinyl alcohol copolymer film, but this ethylene vinyl alcohol copolymer film is rarely used alone, and usually both sides of the film are used. It was used by layering a different kind of protective film on the top.

On the other hand, in order to facilitate tearing, it is common to provide grooves, or scores, with a V-shaped cross section on the surface of the transparent film, but with the three-layer film that prevents oxygen permeation as described above, If the depth of the score is set to reach the ethylene vinyl alcohol copolymer film, the rupture becomes easier, but the function to prevent oxygen permeation is impaired. Although it does not impair the function of preventing this, there was a problem that it could not be easily cut along the score. The reason why it becomes difficult to break when the depth of the score is made shallow is thought to be because, among the different types of films placed on both sides of the ethylene vinyl alcohol copolymer film, one film is not provided with any scoring lines. In addition, this type of can partition plate is attached to the can mouth by wrapping the peripheral edge together with the can body at the can mouth, but there is also the problem that the seam is not sufficiently airtight. Ta.

(Means for solving the problem) However, this idea involves layering an ethylene vinyl alcohol copolymer film on one side of a moldable base film, and applying heat to the outer surface of the ethylene vinyl alcohol copolymer film. A laminated film with an adhesive resin film layered thereon, which is formed into a can partition plate that can be stretched over the can mouth with the thermoadhesive resin film as the inner side of the can, and which is formed into a can partition plate that does not reach the copolymer film. Since a score was provided for the depth, a partition plate for cans was obtained which is a partition plate that can prevent oxygen from permeating and also provides airtightness in the seamed portion.

(Example) To explain this invention in terms of an example, as shown in FIG. 1, one side (lower surface) of a base film 1 having a thickness of 300 μm and having moldability such as an unstretched polyester film or a vinyl chloride film. , thickness
A laminated film in which a 15 μm ethylene vinyl alcohol copolymer film 2 is layered via an adhesive layer 3, and a thermoadhesive resin film 10 is layered on the outer surface (lower surface) of the ethylene vinyl alcohol copolymer film 2. A can partition plate 7 as shown in FIG. 2 is formed using a molding machine. In the figure, 7a is the central disk;
7b is an annular collar for seaming. A tearing score 4 is provided on the central disk 7a along the peripheral edge. The thermoadhesive resin film 10 is formed on the inside of the can, in the illustrated embodiment as the bottom side. The thickness of the base film 1 is suitably 200 to 400 μm in order to maintain moldability. The layering between the base film 1 and the ethylene vinyl alcohol copolymer film 2 is carried out by applying a surface treatment such as corona treatment to the surface of the base film 1, and then attaching a pre-formed film using an adhesive method or the like. In addition to the layering method, it is also possible to form the base film 1 and the ethylene vinyl alcohol copolymer film 2 by extrusion and then layer them by laminating them. In extrusion lamination, an appropriate adhesive may be used depending on the properties of the base film, and there are cases where no adhesive is required.

The can partition plate 7 shown in the above embodiment is, for example, a can 6 containing powdered milk, as shown in FIG.
It is attached to the mouth of the can. In this case, the upper end of the can body of the can 6, the lower end of the short tube 8, and the annular collar 7b are overlapped and tightened to form a tightening portion 9, and the tightening portion 9 is heated to form the thermal bonding. Airtightness can be achieved by melting the plastic film. Since the partition plate 7 has a function of preventing oxygen from passing through, the mouth of the can is hermetically sealed, and the powdered milk contained in the can is prevented from oxidizing. When opening the can, the partition plate 7 can be easily torn along the score 4, making handling easier.

(Effect of the invention) That is, according to this invention, an ethylene vinyl alcohol copolymer film is layered on one side of a base film having moldability, and a thermoadhesive resin is layered on the outer surface of the ethylene vinyl alcohol copolymer film. A can partition plate is made of a laminated film made of a layered film that can be stretched over the mouth of a can, so that it is possible to provide a partition plate for cans that can prevent the permeation of oxygen and seal the can mouth airtight. There is. Furthermore, if a tearing score is provided on the base film along the planned tearing line that does not reach the copolymer film, the ethylene vinyl alcohol copolymer film can be broken even without a score. There is an effect that the tearing can be done smoothly and reliably in accordance with the score.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of a laminated film according to an embodiment of this invention, Fig. 2 is a partially cutaway perspective view of an embodiment of this invention, and Fig. 3 is a partition plate according to an embodiment of this invention. It is a perspective view of the installed can. DESCRIPTION OF SYMBOLS 1... Base film, 2... Ethylene vinyl alcohol copolymer film, 3... Adhesive layer, 4
... Score, 7 ... Partition plate, 7b ... Annular tsuba, 8
... Short pipe, 9 ... Sealing part.

Claims (1)

[Scope of utility model registration request] An ethylene vinyl alcohol copolymer film is layered on one side of a base film that is moldable and has a tearing score along a planned tearing line,
A laminated film in which a thermoadhesive resin film is layered on the outer surface of the ethylene vinyl alcohol copolymer film is formed so that it can be stretched over the can mouth with the thermoadhesive resin film as the inside of the can, and the score is A partition plate for a can, characterized in that the depth does not reach the ethylene vinyl alcohol copolymer film.