JPH0312505Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a container that has a metallic luster and beautiful colors, can be molded using thermoplastic resin, and has heat resistance, moisture resistance, fragrance retention, and gas resistance. The present invention provides a food storage container with good barrier properties.

It is already known to make food storage containers with a metallic luster by laminating films of various thermoplastic synthetic resins together to form a composite sheet. Examples of such containers are described in Japanese Utility Model Application Publication No. 55-41333 and Japanese Utility Model Application Publication No. 55-47941. The composite sheets described in these publications consist of an ethylene-vinyl alcohol copolymer film or a polyvinylidene chloride film on the surface of a polycarbonate film or a thermoplastic polyester film with a vapor-deposited film of aluminum attached via a polyolefin film. are laminated together, and then a polyolefine film is laminated on top of that. These composite sheets contain a vapor-deposited aluminum film, so they have a metallic luster.

In these composite sheets, it is possible to add color to the metallic luster by coloring the polycarbonate film or thermoplastic polyester film, but this requires consideration of the film formulation itself, which has the disadvantage of being cumbersome. It was hot. This inventor formed a transparent or translucent printing ink layer with beautiful colors on a polycarbonate film or thermoplastic polyester film, and then formed an aluminum vapor-deposited film on top of it. Since I could see the luster caused by the aluminum vapor deposition film, I learned that it was possible to obtain products that had both metallic luster and beautiful colors. In addition, we learned that a wide variety of colors can be easily obtained by changing only the color of the printing ink without changing the composition of other layers, based on the printing ink layer. I also learned that the printing ink reduces moisture permeability and other gas permeability. Furthermore, the inventor found that by setting the thickness of the polycarbonate film or thermoplastic polyester film to one-fifth or more of the total thickness, it can be easily heat-formed and has adequate heat resistance for use as a food container. It was found that the results showed that This invention was made based on such knowledge.

That is, this invention can be applied on a polycarbonate film or a thermoplastic polyester film.
forming a transparent or translucent printing ink, depositing an aluminum vapor deposition film thereon, interposing a polyolefin film on the vapor deposition film surface, and laminating an ethylene-vinyl alcohol copolymer film or a polyvinylidene chloride film; A polyolefin layer is formed thereon to form a composite sheet, the thickness of the polycarbonate film or thermoplastic polyester film is 1/5 to 1/45 of the thickness of the composite sheet, with the surface polyolefin layer facing inward, This is a food storage container made by molding a composite sheet into a container shape.

The food storage container according to this invention will be explained as follows based on the drawings. FIG. 1 is a perspective view of the food storage container according to the invention in use. FIG. 2 is a sectional view taken along the - line in FIG. 1. FIG. 3 is an enlarged view of the portion shown in FIG.

In FIGS. 1 and 2, A is the food storage container according to this invention, B is the lid, and C is the food. Container A is constructed as follows.

In FIG. 3, 1 is a polycarbonate film or a thermoplastic polyester film,
A colored printing ink layer 2 is formed on one side, and an aluminum vapor deposition film 3 is adhered thereon. An ethylene-vinyl alcohol copolymer film or a polyvinylidene chloride film 5 is bonded to the surface of the deposited film 3 with a polyolefin film 4 interposed therebetween, and a polyolefin layer 6 is formed thereon. The composite sheet thus produced is molded into a container shape with the polyolefin layer 6 facing inside. The food storage container A according to this invention is constructed in this manner.

The external shape of the food storage container described above can be various shapes other than the illustrated inverted truncated cone shape, such as an inverted quadrangular truncated pyramid shape, a rectangular parallelepiped shape, and a columnar shape with a chrysanthemum-shaped cross section. As the layer 1, a transparent or semitransparent layer is used. As the thermoplastic polyester film for layer 1, an unstretched film is suitable.

As the printing ink layer 2, a transparent or semi-transparent one is used. Its composition is acrylic resin, vinyl resin, epoxy resin, urethane resin,
A rubber resin, a urea resin, or an alkyd resin is dissolved or suspended in an organic solvent as a vehicle. Among these, those using acrylic resin are most preferred. Any color can be used, including red, orange,
Vivid colors such as yellow, green, blue, and purple are preferred. Note that layer 2 may be multilayered. for example,
An opaque printing ink may be partially printed on a transparent printing ink.

As the polyolefin film 4 or the polyolefin layer 6, polyethylene or polypropylene is used, and polypropylene is preferred. Also, both polyethylene and polypropylene can be used. In the illustrated example,
The polyolefin film 4 is composed of a high-pressure polyethylene film 41 and a polypropylene film 42.

The thickness of these films is the same as that of polycarbonate film or thermoplastic polyester film.
is 20 to 100 microns, and the printing ink layer 2
is 1 to 2 microns, the aluminum vapor deposited film 3 is 1 micron or less, the polyethylene film 41 is 10 to 50 microns, the polypropylene film 42 is 10 to 600 microns, and an ethylene-vinyl alcohol copolymer film or The polyvinylidene chloride film 5 is 10 to 60 microns, the polyolefin layer 6 is 10 to 600 microns, and the total thickness of the composite sheet is 70 to 900 microns. Among them, polyolefin film 4 is preferably 40 to 40%.
400 micron, polyolefin layer 6 is 10 to 600
The total thickness is in microns and accounts for 60 to 95% of the total thickness. Therefore, the thickness of the polycarbonate film or thermoplastic polyester film 1 is one-fifth of the total thickness.
Below, it is considered to be 1/45 or more.

The above composite sheet is manufactured, for example, as follows. A printing ink layer 2 is formed by printing on one side of a polycarbonate film or a thermoplastic polyester film 1, and aluminum is vapor-deposited thereon to produce a vapor-deposited film. Separately,
An ethylene-vinyl alcohol copolymer film or a polyvinylidene chloride film 5 is extruded, and at the same time, a polypropylene film 42 and a polyolefin layer 6 are extruded on both sides thereof to form a sandwich structure. Furthermore, a polyethylene film 41 is separately extruded, the vapor-deposited film is pasted on one side thereof, and the sandwich structure is pasted on the other side. The composite sheet thus obtained is formed into a desired shape by vacuum forming or pressure forming.

The food storage container described above includes a vapor-deposited aluminum film, so it has a metallic luster. Since there is a printing ink layer on the outside of the aluminum vapor-deposited film, color is added to the metallic luster, making it extremely beautiful. In this case, if the printing ink layer is completely transparent, it will have a mirror-polished metallic luster, and if it is semi-transparent, it will have a matte metallic luster. Furthermore, by partially printing the printing ink layer, a glossy pattern with silver and color can be created.

In addition, since the vapor-deposited aluminum film is sandwiched between a polycarbonate film or thermoplastic polyester film and a polyolefin film, it is naturally resistant to rust, but by adding a printing ink layer to the polycarbonate film or thermoplastic polyester film, it becomes even more rusty. It is resistant to rust and discoloration even when heated.

Since it contains a polyolefin film and a polyolefin layer, the influence of the polyolefin appears strongly as a whole, and the polycarbonate film or thermoplastic polyester film is located on the surface, and its thickness is less than one-fifth of the total thickness. Because of this, it easily softens when heated. Therefore, molding is easy. Also,
Polycarbonate film or thermoplastic polyester film is placed on the surface, and the thickness of the film is at least 1/45th of the total thickness, so although it is easy to heat mold, it is heat resistant at food handling temperatures. is large.

Furthermore, since the polyolefin layer is located on the inner surface, there are fewer hygiene problems. Additionally, by stacking lids with polyolefin surfaces, they can be easily heat-sealed to seal the food. In addition to the ethylene-vinyl alcohol copolymer film or vinylidene chloride film, the film also contains a vapor-deposited aluminum film, so that permeation of fragrance, gas, and moisture is extremely low, allowing food to be stored for a long time without deterioration. Furthermore, since it has high heat resistance, it can withstand heat sterilization and is therefore more suitable for storing foods. As described above, the food storage container according to this invention has many advantages, such as curry,
It has great practical value as a container for stew, butter, cheese, pudding, jelly, yokan, hamburgers, cooked rice, etc.

Note that the lid B for the food storage container A according to this invention is made by laminating a synthetic resin layer such as a polyolefin film, a polycarbonate film, a thermoplastic polyester film, a nylon film, or paper 7 on one side of the aluminum foil 8,
It is preferable to use one in which a polyolefin layer or an adhesive layer 9 is formed on the other side. The polyolefin layer is preferably of the same type as the polyolefin layer 6 of container A. As the adhesive, vinyl acetate resin, polyolefin resin, paraffin wax, etc. are used. Lid B can be made with layer 9 facing container A, and whether layer 9 is made of polyolefin or adhesive, it can be heat-sealed while being pressed.
Can be easily sealed. To open the package, just pull up the knob 10 shown in FIG. 1 strongly and peel off the lid B. Therefore, it can be easily sealed and opened.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the food storage container of this invention in use, and FIG. 2 is a perspective view of the container shown in FIG.
The sectional view taken along the line, FIG. 3, is an enlarged view of the portion of FIG. In each figure, A is a food storage container of this invention, B is a lid, C is a food product, 1 is a polycarbonate film or thermoplastic polyester film, 2
3 is a printing ink layer, 3 is an aluminum vapor deposition film, 4 is a printing ink layer,
5 is a polyolefin film, 5 is an ethylene-vinyl alcohol copolymer film or polyvinylidene chloride film, 6 is a polyolefin layer, 7 is a synthetic resin layer or paper, 8 is an aluminum foil, 9 is a polyolefin layer or an adhesive layer, 10 is a knob , 41 is a polyethylene film, and 42 is a polypropylene film.

Claims (1)

[Scope of utility model registration request] A transparent or translucent printing ink layer is formed on a polycarbonate film or a thermoplastic polyester film, a vapor-deposited aluminum film is adhered thereon, a polyolefin film is interposed on the surface of the vapor-deposited film, and ethylene-vinyl alcohol is injected onto the film. A composite sheet is obtained by laminating a polymer film or polyvinylidene chloride film and forming a polyolefin layer thereon, and the thickness of the polycarbonate film or thermoplastic polyester film is 1/5 or less and 1/45 or more of the thickness of the composite sheet. Then, with the surface polyolefin layer facing inward,
A food storage container made by forming a composite sheet into a container shape.