JPH0472138A - Hermetically sealable container - Google Patents

Abstract

PURPOSE:To provide a paper container which can be sealed up with wrap film by providing a sealing layer comprising gloss coating of ultraviolet ray curing resin on the side of an opening. CONSTITUTION:An opening 12 of a paper container 11 housing foodstuff 10 is covered with a wrap film 13 and the end of the film 13 is tightly attached to a sealing layer 15 provided on the side 14 of the container 11. The layer 15 comprises a gloss coating of ultraviolet ray curing resin, in which the gloss coating can be applied directly to the side 14 or can be applied through an anchor layer. It is not necessary to cover the whole container with wrap film, but the lap film can be partially applied to seal the container, so that the film is effectively used and the sealing layer has no adhesiveness and hence even if blanks of containers are stacked, blocking does not occur, so that they can be handled at a speed equal to that of general container blanks and can be formed in the same line as that of container blanks.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method of storing food in a paper container containing food in a refrigerator or in a microwave oven without transferring the food to tableware such as a glass container. The present invention relates to a sealable container in which a wrap film can be tightly attached to the opening so that the container can be heated.

[Conventional technology]

When storing food in the refrigerator or heating it in the microwave, the opening of the tableware containing the food was covered with cling film, and the food was sealed and stored or heated.

In this way, in order to seal the opening of the tableware with the lamp film, the part that comes into close contact with the wrap film must have a mirror surface.

Since tableware is generally made of glass, metal, or ceramic, it was possible to seal the opening simply by covering the opening with cling film.

On the other hand, in recent years, food products that can be eaten simply by heating them in a paper container in a microwave oven have become popular. there were.

However, the lamp film does not stick tightly to paper containers, so either transfer the food to tableware and then seal it, or open the opening 3 of the paper container 2 containing food I as shown in FIG.
In addition, the entire container 2 had to be covered with the wrap film 4 and sealed by utilizing the self-adhesion of the wrap films 4 to each other.

[Problem to be solved by the invention] It is time-consuming to transfer food in paper containers to tableware and seal the opening with cling film, and some foods are difficult to transfer. .

Furthermore, in order to seal food in a paper container with a cling film, the lamp films must be brought into close contact with each other, which is undesirable due to a lot of waste.

Therefore, it is conceivable to provide an adhesive layer made of adhesive resin at the portion of the paper container to which the wrap film is to be adhered, or to provide a film layer with a film of the same quality as the wrap film.

However, when providing a film layer consisting of a sticky adhesive layer or wrap film as described above, it cannot be applied in-line at the same speed as printing during container manufacturing, so it must be installed in a separate process after printing. This increases the number of work steps, reduces efficiency, and increases the price.

Further, since the adhesive layer and film layer have high adhesion to paper and metal, they cannot be applied to a sack pasting machine for manufacturing containers, and problems remain in manufacturing.

Therefore, the object of the present invention is to provide a paper container with a part to which a wrap film can be adhered, and in manufacturing the container, a layer to which a lamp film can be adhered can be provided in the printing process.
Moreover, it is an object of the present invention to provide a paper container that can be sealed with a wrap film that can be manufactured using a sack pasting machine.

In addition, paper containers are often printed on at least one side, so it is possible to provide an adhesive layer in the same process as this printing process, and it is also possible to apply the adhesive layer using the normal offset printing method. An object of the present invention is to provide a sealable container that can be provided by a gravure method or a gravure method.

[Means for Solving the Problems] The present invention provides a container made of paper that can be sealed by tightly adhering the opening of the container with a wrap film. This is a sealable container characterized by being provided with an adhesive layer consisting of.

As the ultraviolet curable resin used for this adhesive layer, an acrylic resin, particularly a polyfunctional acrylic resin with a small molecular weight, is preferable.

[Effect]

Since the adhesive layer is a gross coating layer made of ultraviolet curable resin, the edge of the wrap film covering the opening will adhere tightly.
Prevents it from leaving the container.

In addition, since the adhesive layer is made of ultraviolet curable resin, it can be applied at the same time as the stamp on the carton, and since the adhesive layer is not adhesive, the bag pasting machine used for making boxes can be used as is. can do.

Furthermore, by using an ultraviolet curable resin for the adhesive layer and a polyfunctional, low molecular weight acrylic resin,
It becomes a soft gloss coat layer and the adhesion strength of the wrap film is improved.

[Example] FIG. 1 is a perspective view showing an example of a paper container of the present invention.
In the present invention, the opening 12 of the paper container 11 containing the food 10 is covered with a wrap film 13, and the end of the plastic film 13 is brought into close contact with the contact [15] provided on the side 14 of the container 11.

This adhesive layer 15 is made of a gloss coat layer of an ultraviolet curable resin, and this gloss coat layer may be provided directly on the side wall or may be provided via an anchor coat layer.

Hereinafter, various materials shown in Table 1 were applied as an adhesion layer as in the sample shown in No. 21, and the adhesion with polyvinylidene chloride film and polyvinyl chloride film was tested.

The base material used for the test was marked 18+1 shown in Table-2.
We used paper that had been treated with

(Left below) A resin whose main component is -, produced by Dainippon Ink & Chemicals Co., Ltd.
Represents Guicure Co.) #950.

*3 is a resin mainly composed of acrylic polyfunctional monomers and oligomers, FDPAK5 manufactured by Toyo Ink Manufacturing Co., Ltd.
Represents 05H.

In Table 1 above, (0) indicates that the printing layer was provided on the base material by the offset method and (G) the gravure method.

Further, PvC represents polyvinyl chloride, and PVDC represents polyvinylidene chloride.

Brown 1 represents Unicure #16 manufactured by Godo Ink ■, which was anchor-coated with Godo Ink-UV sealer.

*2 is an acrylic polyfunctional monomer, oligomer ('4T
#(1 *4 Toyo Ink Manufacturing Co., Ltd. FD Calton P *5 Toyo Ink Manufacturing Co., Ltd. Aqua GEM *6 Toyo Ink Manufacturing Co., Ltd. FDPAK505H *7 Toyo Ink Manufacturing Co., Ltd. Yu
202.

Next, the content of monomers and oligomers in the UV-curable polyacrylic resins used in E and F in Table 1 and the adhesion between the PVC film and the PVDC film were measured.

The results are shown in the graph of FIG.

As described above, the U-curable polyacrylic resin has excellent adhesion, and is particularly preferably polyfunctional and has a small molecular weight.

〔Effect of the invention〕

The present invention has the above-mentioned structure, and the paper container has a small opening (in both cases, an adhesive layer made of a gloss coat layer made of an ultraviolet curable resin is provided on the side), so that the opening is covered. Since the ends of the lamp film are in close contact with the adhesive layer, there is no need to cover the entire container with the wrap film, and the wrap film can be tightly adhered to the length required for sealing, allowing effective use of the wrap film.

In addition, the adhesive layer is not sticky like conventional adhesive layers, so even if container blanks are stacked on top of each other during box manufacturing, it will not cause the pro-king phenomenon and can be manufactured using a sack pasting machine as is. I can do it. Furthermore, printing can be done at the same speed as printing on general container substrates, so
It has various advantages such as being able to be formed on the same line as the container base material.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of the container of the present invention, Fig. 21 is an explanatory view of a sample used for testing the adhesion of the film, and Fig. 3 is a monomer oligomer content of ultraviolet curable polyacrylic resin. Graph showing the relationship between rate and adhesion, 4th
The figure is an explanatory diagram showing a sealed state of a container using a conventional lamp film. 10... Food 11... Container 12.
...Opening part 13...Wrap film 14...Side part
15... Adhesive layer containing clearing material Figure 3 Figure 4

Claims (1)

[Claims] (1) A container made of paper that can be sealed by tightly adhering the opening of the container with a wrap film, characterized in that an adhesion layer made of a gloss coat layer of ultraviolet curable resin is provided at least on the side of the opening. A sealed container.