JP3039881B2 - Lamination for molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate having excellent moldability, and more particularly to a laminate for molding which can be suitably used in producing lids for various beverage containers such as whiskey and wine. is there.

[0002]

2. Description of the Related Art Conventionally, a lid of a beverage container such as whiskey or wine is made of a lead thin plate or a thin plate obtained by coating a lead thin plate with tin (hereinafter, both are collectively referred to as "lead thin plate").
It is manufactured by the following method. That is, a disk as shown in FIG. 1 is sampled from a lead thin plate, formed into a cylindrical body as shown in FIG. 2, and further formed into a truncated conical cylindrical body as shown in FIG. The lead thin plate is preferable because it has excellent moldability and can be easily formed as shown in the figure.

[0003] However, lead is a toxic substance, and there is a risk of lead poisoning if lead accumulates in the body. In particular, workers engaged in manufacturing lids for beverage containers have a risk of being liable to lead poisoning. In addition, there is also a danger for the final consumer because the final consumer may accidentally immerse the lid of the container in the beverage. For this reason, in recent years, opinions have been stated that the use of lead thin plates should be regulated.

[0004]

Under these circumstances, the present inventors have been working to develop a material that can replace lead thin sheets.
Various studies were performed. For example, an attempt was made to use a tin sheet instead of a lead sheet. However, the tin sheet has a drawback of being inferior in formability. For example, when molding is performed, A in FIG.
In some cases, cracks were generated near the portion indicated by the symbol and near the portion indicated by the symbol B in FIG. Further, a hole may be opened near a portion indicated by C in FIG. As described above, cracking and puncturing are fatal drawbacks in the production of lids for containers such as whiskey. That is,
The lid having such a disadvantage significantly reduces the commercial value of whiskey and the like.

In order to avoid such disadvantages, it is considered that the thickness of the thin tin plate should be increased so that cracks and holes are less likely to occur. However, when the lid of the container is manufactured by increasing the thickness of the tin sheet, a new defect is caused in that it is difficult to break the lid with fingers when opening the lid, and the adhesion of the lid to the container body is also reduced. To come. Therefore,
The present invention, by laminating a synthetic resin film having good formability to a tin sheet, compensates for the poor formability of the tin sheet, and increases the thickness of the tin sheet without cracking during forming. An object of the present invention is to provide a lid for a container of whiskey or the like, which prevents the occurrence of holes or holes and has an excellent appearance.

[0006]

That is, the present invention has a thickness of 50 mm.
The present invention relates to a laminate for molding, which is obtained by laminating a tin thin plate having a thickness of up to 260 μm and a polyolefin film having a thickness of 30 to 150 μm. Also, thickness 50 ~ 13
The present invention relates to a laminate for molding, which is formed by laminating and laminating a tin thin plate having a thickness of 0 μm, a polyolefin film having a thickness of 30 to 150 μm, and a tin thin plate having a thickness of 50 to 130 μm.

[0007] One embodiment of the laminate for molding according to the present invention is a laminate of a thin tin plate and a polyolefin-based film. In this case, the thickness of the tin sheet is 50-260
μm. If the thickness of the tin thin plate exceeds 260 μm, the laminate becomes hard as a whole, and when the lid is manufactured, it becomes difficult to adhere to the container body, which is not preferable. Further, it is not preferable because the surface of the tin thin plate is hardly engraved. this is,
This is because if the thickness is large, the amount of elastic deformation in the thickness direction under a constant load increases, the amount of plastic deformation decreases, and the imprint that embodies the plastic deformation becomes unclear. Further, if the thickness of the tin thin plate is less than 50 μm, it becomes difficult to engrave characters and the like on the surface of the manufactured lid, which is not preferable. on the other hand,
The thickness of the polyolefin-based film is 30 to 150 μm. If the thickness of the polyolefin-based film exceeds 150 μm, the tensile strength of the laminate increases, making it difficult to break the manufactured lid with fingers and making it difficult to open the lid. In addition, the thickness of the polyolefin-based synthetic resin
If the thickness is less than 30 μm, the poor formability of the tin sheet cannot be sufficiently compensated for, and the formability of the laminate is not sufficiently improved.

Another embodiment of the laminated body for molding according to the present invention is formed by laminating and laminating a tin sheet, a polyolefin-based film, and a tin sheet in this order. In this embodiment, the tin sheet is bonded to both sides of the polyolefin film. The thickness of the tin sheet is 50 to 13 for both.
0 μm. When the thickness of the tin thin plate exceeds 130 μm, the laminate becomes hard as a whole, and when the lid is manufactured, it becomes difficult to adhere to the container body, which is not preferable. Further, if the thickness of the tin thin plate is less than 50 μm, it becomes difficult to engrave characters and the like on the surface of the manufactured lid, which is not preferable. The thickness of the polyolefin-based film is 30 to 150 μm for the same reason as in the above-described embodiment.

[0009] The tin sheet and the polyolefin film are
Laminated. The polyolefin type referred to in the present invention is:
Those having a carboxyl group introduced as a side chain in a main chain composed of polyethylene, polypropylene and hydrocarbon (hereinafter, referred to as
It is called "carboxylated polyolefin". ).
Examples of the carboxylated polyolefin include an ethylene ionomer, a propylene ionomer, an ethylene-acrylic acid copolymer, a propylene-acrylic acid copolymer,
Ethylene-vinyl acetate copolymer, partially saponified ethylene-vinyl acetate copolymer, propylene-vinyl acetate copolymer, partially saponified propylene-vinyl acetate copolymer, carboxylic acid-modified polyethylene, carboxylic acid-modified polypropylene, etc. Is used. In order to bond the polyolefin-based film and the tin thin plate, the polyolefin-based film may be in a softened or molten state to give an adhesive force to the polyolefin-based film, and the two may be bonded by the adhesive force. When a polyethylene film or a polypropylene film is used as the polyolefin-based film, it may be bonded to a tin thin plate with a polyurethane-based adhesive or a carboxylated polyolefin-based adhesive. When a carboxylated polyolefin is used, the solution (organic solvent solution, organosol, dispersion, etc.) is applied to the surface of the tin sheet, and then the coating solution of the carboxylated polyolefin is dried to obtain a polyolefin-based film. And may be bonded to a thin tin plate.

The tin sheet used in the present invention is tin 100
It may be a thin plate composed of a weight percent or a thin plate composed of a tin alloy containing a small amount of another element. As other elements, copper (Cu) or antimony (Sb) is preferable. This is because the addition of such an element improves the formability of the tin sheet. The addition amount is 0.03-0.40 for Cu
% By weight, preferably 0.2-1.0% by weight for Sb. Cu is less than 0.03% by weight or Sb is 0.2% by weight
If it is less than 30, the moldability tends not to be sufficiently improved. On the other hand, when Cu exceeds 0.40% by weight or Sb exceeds 1.0% by weight, the moldability tends to be rather lowered. Furthermore, the lid obtained by molding tends to be less likely to adhere to the container body or to be less likely to be broken by fingers when opening the lid. The thin plate referred to in the present invention has a thickness of about 0.5 mm or less, and includes a so-called foil.

As described above, the laminate for molding is subjected to, for example, molding as shown in the figure. When a lid of a container such as whiskey is manufactured using the laminate for molding, molding is performed such that a thin tin plate constitutes the surface of the lid. Then, a trademark of whiskey or the like, a manufacturer's name, or the like is stamped on the surface of the tin thin plate.

[0012]

【Example】

Example 1 An ingot made of tin was rolled to obtain a thin tin plate having a thickness of 250 μm. On the other hand, an ethylene ionomer film having a thickness of 100 μm was prepared. The tin sheet and the ethylene ionomer film were laminated and introduced between a pair of heated calender rolls. Then, by laminating the ethylene-based ionomer film, the tin thin plate and the ethylene-based ionomer film were bonded to obtain a laminate for molding.

Example 2 In the same manner as in Example 1, a tin thin plate having a thickness of 100 μm and a polypropylene film having a thickness of 80 μm were laminated to obtain a laminate for molding.

Example 3 An ingot made of tin was rolled to obtain two thin tin plates having a thickness of 100 μm. On the other hand, an ethylene ionomer film having a thickness of 100 μm was prepared. Tin thin plates were laminated on both sides of the ethylene ionomer film and introduced between a pair of heated calender rolls. Then, by softening the ethylene-based ionomer film, the two tin sheets were bonded together with the ethylene-based ionomer film to obtain a laminate for molding.

Example 4 In the same manner as in Example 3, a 60 μm-thick ethylene ionomer film was bonded to both sides of a 60 μm-thin tin sheet to obtain a laminate for molding.

Comparative Examples 1 to 3 Tin ingots were rolled to obtain tin thin plates having a thickness of 300 μm, which were used as forming thin plates (Comparative Example 1). Similarly, a sheet having a thickness of 350 μm (Comparative Example 2) and a sheet having a thickness of 220 μm (Comparative Example 3) were used as thin plates for forming.

Comparative Example 4 An ingot made of aluminum was rolled to obtain an aluminum foil of 200 μm. This aluminum foil was annealed at a temperature of 300 ° C. for 5 hours to obtain a thin plate for forming.

Comparative Example 5 An ingot made of tin was rolled to obtain a thin tin plate having a thickness of 100 μm. On the other hand, two 100-μm-thick ethylene ionomer films were prepared. Then, an ethylene-based ionomer film was laminated on both surfaces of the tin thin plate and introduced between a pair of heated calender rolls. By softening the ethylene-based ionomer film, the tin thin plate and the ethylene-based ionomer film were bonded to obtain a thin plate for molding.

Comparative Example 6 An ingot made of tin was rolled to obtain a thin tin sheet having a thickness of 200 μm. On the other hand, an ethylene ionomer film having a thickness of 200 μm was prepared. The tin sheet and the ethylene ionomer film were laminated and introduced between a pair of heated calender rolls. Then, by softening the ethylene-based ionomer film, the tin thin plate and the ethylene-based ionomer film were bonded to obtain a thin plate for forming.

Each of the thin plates obtained as described above is formed into a shape as shown in the figure, and a truncated conical cylinder (head diameter 30 mm, bottom diameter 34 mm,
Height 50 mm). At this time, the moldability, the adhesion to the container body, the breakability of the lid, and the engraving of the characters were evaluated.
It was shown to.

[Table 1] As is clear from Table 1, when the laminated body for molding according to the example was molded, all of its moldability, adhesion to the container body, breakability of the lid, and engraving of characters were good. there were. On the other hand, the thin sheet for forming according to the comparative example was not satisfactory in any of its performances. The evaluation criteria for each item in Table 1 are as follows. Note 1) Workability: The workability at the time of molding was visually evaluated as follows. …: Good moldability, △: Slightly difficult to mold, X: Difficult to mold, XX: Cracks and holes occurred during molding, and molded articles could not be obtained. 2) Adhesion: The lid obtained by molding was attached to the container main body, and the adhesion with the container main body was evaluated by touch as follows. …: Good adhesion, △: not sufficiently adhered to the container body, ×: almost not adhered to the container body,-: no evaluation was possible because no molded product was obtained. 3) Engravability: A character was imprinted on the cover obtained by molding, and the sharpness of the character was visually evaluated as follows. ○
… Character is clear, △… Character is slightly unclear, ×
… Characters are unclear, XX… Characters cannot be engraved. 4) Feathering property: The lid obtained by molding was broken by a finger, and the degree of occurrence of jagged edges was visually evaluated as follows. …: The broken edge is clean, △: The cut edge has some jagged edges, x: The cut edge has jagged edges,-: A molded article cannot be obtained, and thus cannot be evaluated.

[0021]

As described above in detail, the laminate for molding according to the present invention has the effect that the moldability can be improved by supplementing the poor moldability of the tin sheet with the polyolefin film. To play. That is, there is an effect that cracks and holes are less likely to be formed during the forming process. In addition, since the thickness of the tin thin plate and the thickness of the polyolefin-based film were within a certain range, the lid of the container obtained by molding the laminate for molding was excellent in adhesion to the container body, In addition, the lid can be broken with fingers, and the lid can be easily opened. Therefore, the laminate for molding according to the present invention is suitable for use in manufacturing a lid of a beverage container such as whiskey or wine.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disk-shaped thin plate used for forming a lid of a container.

FIG. 2 is a perspective view of a cylindrical body formed by processing a thin disk.

FIG. 3 is a perspective view of a truncated conical cylinder obtained by further molding the cylinder.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-233831 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 15/08 B32B 7/02

Claims (2)

(57) [Claims] 1. A thin tin plate having a thickness of 50 to 260 μm and a thickness of 30 to 1
A laminate for molding, wherein the laminate is formed by laminating a 50 μm polyolefin film. 2. A thin tin plate having a thickness of 50 to 130 μm and a thickness of 30 to 150 μm.
A laminate for molding, which is formed by laminating and bonding a polyolefin-based film having a thickness of 50 μm and a tin thin plate having a thickness of 50 to 130 μm.