JP2002068336A - Water-soluble film and bag for pocket tissue paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-soluble film which has high workability and moisture resistance and can be dissolved in water and which can be used not only in packaging but also in various applications. SOLUTION: The water-soluble film comprises a piece of paper impregnated with a water-soluble resin, and the resin has thermally fusible properties.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a water-soluble film and a bag for pocket tissue.

[0002]

2. Description of the Related Art There are various uses of a film, one example of which is a packaging use. From the viewpoint of protecting the packaged object and maintaining good appearance, the packaging film, which is a film used for this purpose, is not easily deformed even in a humid atmosphere. In many cases, morphological stability in a gas (including, for example, the normal atmosphere) (characteristics of maintaining substantially the original form and maintaining substantially the original function), that is, moisture resistance is often required.
Means for imparting this moisture resistance to the packaging film include, for example, in the case of a resin film, means for increasing the crosslink density of the resin, but on the other hand, the water solubility of the packaging film decreases. I do.

As described above, if the packaging film is made hardly water-soluble, it becomes difficult to dissolve it in water after use and disuse, and this packaging film is one of the causes of environmental pollution. It has been pointed out.

[0004] In particular, in the case of a pocket tissue, the bag of the pocket tissue is generally made of a water-insoluble resin even though the content of the tissue is made of water-soluble paper to prevent environmental pollution. Because it is made of film, it does not dissolve in water and is considered a cause of environmental pollution.

[0005] Therefore, an attempt has been made to make a bag for pocket tissue from water-soluble paper, similarly to the tissue. However, there is a problem that paper cannot be easily processed into a bag because it is difficult to bond the paper by a heat fusion method, which is a general method for forming a bag, and is not practical.

Attempts have also been made to make pocket tissue bags from films of water-soluble resins. However, water-soluble resin films are generally highly hygroscopic,
Furthermore, since the morphological stability decreases with an increase in the amount of absorbed moisture, there is a problem that it is difficult to function as a bag under daily use conditions including use in a humid atmosphere.

[0007]

In view of the above problems, the present invention is directed to a water-soluble film that can be used not only for packaging but also for various purposes. It is an object to provide a water-soluble film having excellent properties. Another object of the present invention is to provide a pocket tissue bag that has moisture resistance and water solubility and is useful for preventing environmental pollution.

[0008]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that the above means can be solved by the following means. That is, the present invention provides a water-soluble film in which a water-soluble paper is impregnated with a water-soluble resin, and the water-soluble resin has a heat-fusible property.
In addition, this water-solubility means that when a substance is widely immersed in water, including, for example, hydrolyzation that breaks down into individual fiber units when paper or the like is immersed in water, it becomes almost invisible to the naked eye. Refers to the properties that can be obtained. Further, the term "heat-fusing property" means, for example, the property that when a certain substance is heated at a temperature or the like, the substance shows plasticity and can be adhered to another substance. Further, the present invention provides a water-soluble film in which the water-soluble resin is a polyvinyl alcohol-based resin. The present invention also provides a water-soluble film having a weight ratio of paper to water-soluble resin per unit area of 5: 2 to 5: 3. Further, the present invention provides a pocket tissue bag formed of a water-soluble film having form stability in a water-containing gas and heat-sealing property. Also, the present invention provides a pocket tissue bag, wherein the water-soluble film is a water-soluble film obtained by impregnating a water-soluble resin into water-soluble paper. Further, the present invention provides a pocket tissue bag in which the water-soluble film is a water-soluble film obtained by sticking a water-soluble paper and a water-soluble resin film.
The present invention also provides a pocket tissue bag in which the smoothness of at least one surface of the paper to be stuck to the water-soluble resin film is from 20 seconds to 30 seconds. Here, the smoothness is defined by JIS P
8119 refers to Beck smoothness.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) As a first embodiment, a water-soluble film in which a water-soluble paper is impregnated with a water-soluble resin having a heat-fusing property, and a bag of a pocket tissue formed of the film. Is described.

This water-soluble film is almost the same in appearance as ordinary paper, and has a thickness of about 10 μm to 5 μm, for example.
00 μm. From the viewpoint of printability of the design on the surface of the water-soluble film, it is desirable that the smoothness of at least one surface of the water-soluble film is 20 seconds or more and 30 seconds or less.

The paper impregnated with the water-soluble resin only needs to be water-soluble, and for example, from the viewpoint of the speed of hydrolysis and the size of fibers after hydrolysis, kenaf made from a mallow plant or the like is used. Are preferred. The water-soluble resin to be impregnated into the paper only needs to have heat-fusing properties, such as low plasticization temperature, high transparency, low swelling due to moisture absorption, and the rate of dissolution in water. From the viewpoint that the water temperature at the time of aqueous solution may be low, polyvinyl alcohol resins such as polyvinyl alcohol and modified polyvinyl alcohol are preferred.

The weight ratio of paper to water-soluble resin per unit area is not particularly limited, but is preferably from 5: 2 to 5: 3 from the viewpoints of moisture resistance, heat fusing property, cost, ease of production, and the like. When the amount of the water-soluble resin is larger than the above range, the moisture resistance is reduced, and when the amount of the paper is larger, the heat-sealing property becomes insufficient.

The method for producing the water-soluble film includes, for example, a method of impregnating the paper with a water-soluble resin during or after the papermaking process. The papermaking process of this paper may be a usual papermaking process, and when a resin is impregnated during the papermaking process, the process is not particularly limited. Further, during the papermaking process, or after the papermaking, the method of impregnating the paper with the water-soluble resin is not particularly limited, but from the viewpoint that the resin easily penetrates into the paper, for example, the water-soluble resin There is a method of dipping paper in the manufacturing process or paper after the manufacturing in the aqueous solution.

The water-soluble film of the first embodiment can be used for various purposes. For example, the water-soluble film is used for packaging such as a bag. When making a bag with this water-soluble film, this film has heat-fusibility, so that after cutting, a bag can be easily made by fusing the ends so as to form a bag. .

Further, since the water-soluble film contains paper, it has excellent moisture resistance, that is, excellent morphological stability in a water-containing gas. Therefore, it can be used for packaging even in ordinary air, especially in humid air.

Further, the water-soluble film is suitably used also as a pocket tissue bag. Specifically, in general, after all the tissue in a pocket tissue is used, the bag becomes unnecessary and is discarded. At this time, since the pocket tissue bag formed from the water-soluble film has water solubility, it can be poured into water together with the tissue, for example, and environmental pollution by the bag can be reduced.

Further, since the water-soluble film is formed by impregnating a water-soluble resin into water-soluble paper, the film thickness can be reduced, and the speed of dissolving in water can be increased.

(Second Embodiment) In a second embodiment, a tissue paper bag is formed of a heat-fusible water-soluble film formed by adhering a water-soluble paper and a water-soluble resin film. It is characterized by having. Note that members, configurations, effects, and the like, which are the same as those of the first embodiment, are the same, and description thereof is omitted.

The paper used for the water-soluble film is not particularly limited as long as it has water solubility, but it is preferable that the smoothness of at least one surface is 20 seconds or more and 30 seconds or less. The water-soluble resin film is not particularly limited as long as it has a heat-fusing property, and has a low plasticizing temperature, high transparency, little swelling due to moisture absorption, a rate of dissolving in water, It is preferable to use a polyvinyl alcohol-based resin film from the viewpoint that the water temperature is low.
The method of adhering the water-soluble paper and the water-soluble resin film is not particularly limited. For example, a method of adhering the water-soluble resin film by fusing utilizing the heat-fusing property of the water-soluble resin film is exemplified.

Since the water-soluble film forming the bag of the tissue paper has the water-soluble paper and the water-soluble resin film adhered thereto, one surface thereof is paper, and at least one surface of the paper has a smoothness. 20 seconds or more and 30 seconds or less, it is possible to more easily and clearly print a design on the surface of the water-soluble film paper, and further enhance the commercial value of the pocket tissue and the advertising effect. it can.

[0022]

The water-soluble film of the present invention is obtained by impregnating a water-soluble paper with a water-soluble resin having heat-fusibility.
Has moisture resistance and excellent workability. Further, the water-soluble film of the present invention is more excellent in moisture resistance since the water-soluble resin is a polyvinyl alcohol-based resin. Further, the water-soluble film of the present invention, a paper and a water-soluble resin,
Since the weight ratio per unit area is 5: 2 to 5: 3, the moisture resistance and workability are more excellent. Further, since the pocket tissue bag of the present invention is formed of a water-soluble film, environmental pollution due to the bag can be reduced. Furthermore, since the pocket tissue bag of the present invention is formed of a water-soluble film formed by impregnating a water-soluble resin into water-soluble paper, the film thickness can be reduced,
The rate of dissolution in water can be faster. Further, since the pocket tissue bag of the present invention is formed of a water-soluble film in which a water-soluble paper and a water-soluble resin film are adhered, it is possible to print a design or the like more easily. Furthermore, since the pocket tissue bag of the present invention is formed of a water-soluble film in which paper having at least one surface having a smoothness of 20 seconds or more and 30 seconds or less and a water-soluble resin film are adhered to each other, More easily and
You can print clearly.

Claims (7)

[Claims] 1. A water-soluble film comprising a water-soluble paper impregnated with a water-soluble resin, wherein the water-soluble resin has heat-fusibility. 2. The water-soluble film according to claim 1, wherein the water-soluble resin is a polyvinyl alcohol-based resin. 3. The water-soluble film according to claim 1, wherein the weight ratio of the paper to the water-soluble resin per unit area is from 5: 2 to 5: 3. 4. It has morphological stability in a water-containing gas, and
A pocket tissue bag formed of a heat-fusible water-soluble film. 5. The bag for pocket tissue according to claim 4, wherein the water-soluble film is formed by impregnating a water-soluble paper with a water-soluble resin. 6. The bag for pocket tissue according to claim 4, wherein the water-soluble film is constituted by adhering a water-soluble resin film to water-soluble paper. 7. The bag for pocket tissue according to claim 6, wherein the smoothness of at least one surface of the paper is 20 seconds or more and 30 seconds or less.