JPH082557A - Paper air pack - Google Patents

Abstract

PURPOSE:To provide air-tightness and strength of a paper air pack and make it possible to reuse it and prevent environmental pollution when disposed, by superposing, a water-soluble film at the whole inner side face and sticking together to hermetically seal the opposite faces of the peripheral edge to each other. CONSTITUTION:Water-soluble films 2 are superposed and stuck to each other at the respective inner faces of the superposing paper 1. The peripheral part 8 is hermetically sealed except a blowing-in gas aperture 7 by pressing with heat or the like. A gas is charged from the blowing-in gas aperture 7 by a specified pressure and then the aperture is heat-sealed to form an air pack P. The water-soluble film 2 is made of polyvinyl alcohol obtained by hydrolysis of polyvinyl acetate for instance. The air pack is pref. 15 micron or thicker from the view point of the air-tightness. Regarding the adhesion of paper and water-soluble film, polyvinyl alcohol paste for instance may be applied for heat-sealing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper air pack in which sheets of paper are superposed, their peripheral portions are sealed by adhesion, thermocompression bonding, etc., and gas is sealed inside.

[0002]

2. Description of the Related Art Conventionally, what is called an air pack is generally formed by stacking plastic sheets on top of each other and sealing the periphery by adhesion, thermocompression or the like, and enclosing a gas inside. Various air packs are used, from those having a large number of small volume bubbles to those having a large size such as a so-called air pillow.

Since plastic air packs have environmental problems when they are discarded and are difficult to reuse, it has been demanded recently to develop paper air packs instead of plastic. Is coming.

In the case of an air pack made of paper, since the airtightness of the paper is generally not so high, there is a problem that the air pack made of ordinary paper loses air over time. At present, the following three measures are taken to solve this problem.

First, an emulsion coating is applied to the inner surface of the superposed papers to close the space between the cellulose fibers of the papers. This gives the paper airtightness.

Secondly, a plastic sheet is laminated on the inner surface of the papers to be laminated. As a result, the paper is made airtight like the first one.

Thirdly, with the recent development of highly airtight paper, an air pack is formed using this airtight paper.

In the first to third cases, the peripheral edge is sealed by adhesion, thermocompression bonding, etc., but in most cases thermocompression bonding is used, and the paper in this case is heat resistant so that it can withstand the thermocompression bonding. Sexual thing is used. Since it is used as an air pack, it goes without saying that the paper itself has a strength capable of withstanding a desired atmospheric pressure.

[0009]

As described above, the main reason why the conventional air pack made of a plastic sheet is replaced with that made of paper is the environmental pollution when the plastic sheet is discarded, and the reuse is difficult. That is the point. In this respect, while the second air pack has a great advantage of maintaining high airtightness, since it uses a plastic sheet, it has the same problem as an air pack made of a conventional plastic sheet.

On the other hand, the first air pack for applying emulsion to the inner surface of the paper to be laminated and the third air pack using the airtight paper do not use plastic sheets, and therefore, when discarding them. Moreover, it has an advantage that it does not cause a problem of environmental pollution and can be reused.

However, in some of these first and third air packs, after a certain amount of time has passed since they were manufactured, the gas in the pack gradually escapes, or one day suddenly escapes. It may happen. In the case of an air pack of paper coated with emulsion, this phenomenon causes wrinkles on the emulsion dried body, and the emulsion dried body solidified at the peripheral seal portion prevents subtle deformation of the paper. When wrinkles occur, the overlapped papers cannot follow the shape of the wrinkles and the parts are separated, and in the case of an air pack with highly airtight paper, the papers are stuck together, so the edges It is considered that this is due to the peeling of the fiber layer of the paper at the seal part.

Therefore, as a result of comparative examination of the first, second and third air packs, the present inventor has developed a fourth air pack in which the respective advantages are left and the defects are eliminated. Is.

[0013]

SUMMARY OF THE INVENTION According to the present invention, sheets of paper are overlapped with each other, and peripheral edges thereof are sealed by adhesion, thermocompression bonding, or the like.
In a paper-made air pack in which gas is enclosed, a water-soluble film is laminated and pasted on the entire inner side surfaces of the respective inner surfaces of the laminated papers up to the peripheral portion, It is a paper air pack in which the opposite surfaces of the peripheral edge of the film are hermetically sealed.

In this case, the water-soluble film is preferably made of polyvinyl alcohol from the viewpoint of easy availability.

The water-soluble film preferably has a thickness of 15 microns or more from the viewpoint of airtightness.

Further, from the viewpoints of reliability and the ability to use conventional equipment, the pasting of the paper and the water-soluble film may be carried out, for example, by applying an adhesive made of polyvinyl alcohol and thermocompression bonding.

The paper is preferably airtight and heat-fusible. If the paper is highly airtight,
The water-soluble film may be thinner than the aforementioned 15 microns.

[0018]

In the paper-made air pack of the present invention, since the films are laminated and stuck on the entire inner surface of the paper, the same high airtightness as that of the second air pack can be maintained. In this case, since the film is water-soluble, when the paper is recycled, the film dissolves in water and only the fibers of the paper remain, and therefore the paper can be reused. In addition, since the film is water-soluble even when it is discarded, environmental pollution due to the sheet unlike the conventional case does not occur.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in FIGS.

The air pack of this embodiment basically comprises
It is a paper air pack in which papers are overlapped, the peripheral portions are sealed by adhesion, thermocompression bonding, etc., and gas is sealed inside. Then, the water-soluble film 2 is superposed on and pasted on the respective inner surfaces of the superposed papers 1.

The film 2 is made of polyvinyl alcohol obtained by hydrolysis of polyvinyl acetate, and preferably has a thickness of 15 μm or more from the viewpoint of airtightness of the air pack.

The film 2 is attached to the paper 1 by so-called laminating as shown in FIG. 3, for example. That is, the wound film 2 made of polyvinyl alcohol is conveyed to the heat roll 5 via the coating roll 3 and the dryer 4, and is thermocompression-bonded to the paper 1 at the part of the heat roll 5 and cut into a predetermined size. Then, a laminated sheet S of the paper 1 and the film 2 is obtained. In the laminated sheet S thus obtained, the paper 1 and the film 2 are laminated and laminated in the entire area up to the peripheral portion of the surface. In this case, in FIG. 3, the coating roll 3 coats the adhesive 6 made of polyvinyl alcohol on one side surface of the film 2 in this example.

In the air pack P of this embodiment, the films 2 of the sheet S are made to face each other and the opposing surfaces of the peripheral portions are hermetically sealed by thermocompression bonding, in which case gas (usually air) is inside. Is enclosed. This gas encapsulation is performed by thermocompression bonding the peripheral portion, leaving a part of it as a gas blowing port 7 and sealing the rest, and then sealing the gas at a predetermined pressure from the gas blowing port 7. After the sealing, the gas blowing port 7 is thermocompression bonded. In FIG. 2, 8 is a thermocompression bonding part.

In the case of the embodiment, the paper 1 is preferably one having a heat fusion property. Furthermore, it is preferable that the paper 1 has high airtightness. In this case, the film 2 may be thinner than 15 microns. However, the peripheral edge of the sheet S can be sealed by any method as long as it can be sealed, such as thermocompression bonding and adhesion with an adhesive. Also, the film 2 is not limited to the one made of polyvinyl alcohol as long as it is water-soluble.

According to the present invention, as described above, the water-soluble film 2 is laminated and adhered to the entire inner side surface of the inner surface of the paper 1 up to the peripheral edge, and the peripheral edge of the film 2 is adhered. This is an air pack made of paper in which opposing surfaces are hermetically sealed. First, since the film 2 is attached to the inside of the paper 1, even if the paper 1 is not airtight, the film 2
Due to the presence of, airtightness is given to the entire air pack.
Further, the film 2 improves the strength of the entire air pack. Secondly, since the peripheral edge sealing structure (sealing part) is formed by the films 2, the inconvenience of peeling the fiber layer of the paper does not occur in the case of papers, and wrinkles occur in the sealing part. However, the film, by its nature, does not prevent the film from following the shape of the wrinkles, and therefore the situation where the seal portion is separated as in the case of conventional emulsion coating does not occur. Thirdly, since the film 2 is water-soluble, when the paper 1 is recycled, the film 2 dissolves in water and only the fibers of the paper remain, so that the paper can be reused. In addition, since the film 2 is water-soluble even if it is discarded, environmental pollution due to the plastic sheet unlike the conventional case does not occur.

[0026]

As described above, according to the present invention,
Airtightness is given to the entire air pack and the strength of the entire air pack is improved. Further, in the present invention, since the sealing structure of the peripheral portion is made of the films, there is no inconvenience that the fibrous layer of the paper is peeled in the case of the paper. Further, even if wrinkles are formed in the seal portion at the peripheral portion, the film does not prevent the film from following the shape of the wrinkle by its nature, so that the seal portion separates as in the case of conventional emulsion coating. Nothing happens. Furthermore, since the film used in the present invention is water-soluble,
When the paper is recycled, the film dissolves in water, leaving only the fibers of the paper, so that the paper can be reused. Further, even if discarded, since the film used is water-soluble, there is no problem of environmental pollution due to the conventional plastic sheet.

[Brief description of drawings]

FIG. 1 is a perspective view showing a paper air pack according to the present invention.

FIG. 2 is a view on arrow XX in FIG.

FIG. 3 is a diagram showing a laminating process.

[Explanation of symbols]

 1 Paper 2 Film S Sheet P Air pack

Claims (5)

[Claims] 1. A paper-made air pack in which papers are superposed, and a peripheral portion is hermetically sealed by adhesion, thermocompression bonding, etc., and gas is enclosed in the inside thereof. A paper-made air pack, characterized in that a water-soluble film is laminated and stuck on the entire inner side surface up to the peripheral edge portion, and the opposing surfaces of the peripheral edge portion of the film are hermetically sealed. 2. The paper air pack according to claim 1, wherein the water-soluble film is made of polyvinyl alcohol. 3. The paper air pack according to claim 1, wherein the water-soluble film has a thickness of 15 microns or more. 4. The paper air pack according to claim 1, wherein the paper and the water-soluble film are bonded to each other by thermocompression bonding. 5. The paper air pack according to claim 1, wherein the paper is airtight and heat-fusible.