JPH09164623A - Laminated film, production thereof and bag body using the same and bagged-up body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a bag body having a double structure substantially consisting of an outer bag and an inner bag composed of a water-soluble film and excellent in the release characteristics of the outer bag. SOLUTION: A laminated film consists of a film for an outer layer, a water- soluble film 6 and the intermediate layer 5 interposed between the film 20 for the outer layer and the water-soluble film 6. At least the surface on the side of the water-soluble film of the intermediate layer contains high pressure polyethylene oxidized to a desired degree. The film 20 for the outer layer and the intermediate layer 5 are strongly bonded and the intermediate layer 5 and the water-soluble film 6 are directly brought to a contact state to be weakly bonded in a releasable manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film, a method for producing the same, and a bag and a package using the same.

[0002]

2. Description of the Related Art Conventionally, in order to store agricultural chemicals and other various kinds of contents, a bag made of a laminated film in which each layer is firmly laminated in a non-peeling manner is used. This conventional laminated film has a film (for example, a film made of LLD-PE (linear lowden polyethylene)) that can be thermally bonded to each other (that is, heat sealable) on the innermost side.
The inside of the bag body in which the laminated films are superposed so that the heat-bondable film is on the inside and heat-sealed at predetermined positions to weld and seal the heat-bondable films facing each other at the predetermined positions. The housed items are housed in the house.

[0003] There are two systems called a bag supply system and an automatic packaging system, respectively, as a system in which the contents are accommodated in a sealed bag formed by using the laminate film. In the bag supply method, a bag manufacturer or the like manufactures a bag having one side open using the laminate film, and a manufacturer of the stored material receives the supply of the bag and receives the supply of the bag from the opening. After the contents are filled, the opening is closed by heat sealing. On the other hand, in the automatic packaging method, a container manufacturer or the like fills the container while sequentially performing the lamination of the laminate film and heat sealing at a predetermined location, and finally puts the container in a sealed air bag. This is a method in which the state is accommodated.
In any of the methods, an automatic machine for automating the above process is widely used in a container manufacturer or the like. That is, in the case of the bag feeding method, an automatic machine that automatically heat-seals the opening after automatically filling the bag with the one side opened is used. Automatic machines are used to automate the automatic packaging process.

In general, even when the stored material is, for example, a powdered pesticide (which is usually diluted with water at the time of use), it is stored directly in the above-mentioned conventional laminated film bag. I have. For this reason, when the user of the pesticide opens the bag, the pesticide in the form of a powder rolls up at the time of opening and the user inhales the powder, or the user touches the powder by hand. So it will harm the human body. In addition, when the powdered pesticide is put into a tank or the like from a bag to dilute the powdered pesticide with water, the powdered pesticide rolls up, etc., and similarly harms the human body. . Also, even after taking out the pesticide from the bag,
Since pesticides adhere to the inside of the bag, if the bag is discarded as ordinary garbage as it is, it causes pollution.

Therefore, in recent years, in order to prevent such danger and ensure safety, a powdery pesticide is housed in a bag made of a water-soluble film and sealed in a bag. It has been practiced that the powdered pesticide housed in the body is further housed and sealed in a bag made of the above-mentioned conventional laminated film. In this case, the bag of the water-soluble film is the inner bag, and the bag of the conventional laminated film is the outer bag. The reason why such an outer bag is used is that the water-soluble film is easily deteriorated by the external environment and has insufficient strength.

When such an inner bag and an outer bag are used, the pesticide does not roll up even when the outer bag is opened, and the pesticide is put in a tank or the like without taking out the pesticide from the inner bag. It is sufficient to dilute with water (this dissolves the inner bag made of the water-soluble film), so that no harm is caused to the human body, safety can be ensured, and the handling becomes extremely easy. Further, after the pesticide is taken out from the outer bag, no pesticide is attached to the inside of the outer bag, so that there is no problem if the outer bag is directly discarded as ordinary garbage.

[0007] The situation described above applies not only to powdery agricultural chemicals, but also to granular and liquid agricultural chemicals and other various kinds of stored materials.

[0008]

However, the conventional method using the inner bag and the outer bag greatly increases the cost. That is, for example, in the conventional method using the inner bag and the outer bag, the inner bag has to be manufactured separately, resulting in an extra manufacturing cost, and the contents accommodated in the inner bag are stored in the outer bag. In order to accommodate the above, the existing automatic machine described above cannot be used in any of the above-mentioned bag feeding system and automatic packaging system, new equipment is required, and equipment cost is extra.

Therefore, a laminate film is prepared by weakly adhering an outer layer film composed of one or more layers and a water-soluble film so as to be peelable with an adhesive having a low adhesive strength (adhesive strength or peel strength). By the conventional bag feeding method or the automatic packaging method, the laminated films were overlapped such that the water-soluble film was on the inside, heat-sealed at a predetermined location, and the water-soluble film facing the predetermined location was welded and sealed. It is conceivable to store the contents inside the bag. In addition, the water-soluble films can be generally thermally bonded to each other.

According to the method using the adhesive, the bag made of the laminated film has a double structure of an outer layer film acting as an outer bag and a water-soluble film acting as an inner bag. Since the space is weakly adhered so that the space can be peeled off, the user of the contents can remove the film for the outer layer only and store it in the water-soluble film inner bag in the same manner as the inner bag and the outer bag described above. It is possible to obtain the contents in a state where the contents such as agricultural chemicals do not roll up. Since it suffices (this dissolves the inner bag made of the water-soluble film), it does not cause any harm to the human body and can ensure safety, and its handling becomes extremely easy.

[0011] Then, at the time of storage of the contents, the above-mentioned laminated film can be handled in the same manner as a conventional laminated film, so that existing equipment such as an automatic machine can be used as it is. Also, unlike the inner bag and outer bag methods described above, the inner bag is not manufactured separately, so that the manufacturing cost is not so much required.

However, in the method using this adhesive, it is difficult to obtain an adhesive having ideal characteristics as the adhesive, and for example, the components of the adhesive and the water-soluble film react with time. The properties of the adhesive and the water-soluble film change, making it difficult for the user to peel the outer layer film from the water-soluble film when using the stored items, or for the outer layer to reach the user. There is a possibility that the film may be peeled off, pinholes or the like may be generated in the water-soluble film, or the water-solubility of the water-soluble film may be reduced. In addition, when the outer layer film is peeled off from the water-soluble film, a part of the adhesive remains on the water-soluble film, impairing the solubility of the water-soluble film, or dissolving the water-soluble film in water when using a container such as an agricultural chemical. After that, the components of the adhesive react with the components of the stored material such as the agricultural chemical in the tank or the like, and the stored material such as the agricultural chemical may be deteriorated.

The present invention has been made in view of the above circumstances, and provides a bag body having a substantially double layer structure of an outer bag and an inner bag made of a water-soluble film and having an excellent peeling property of the outer bag. It is an object of the present invention to provide a laminate film that can be manufactured using existing equipment, a method for manufacturing the same, and a bag and a bag using the same.

[0014]

In order to solve the above-mentioned problems, the laminated film according to the first aspect of the present invention comprises:
An outer layer film composed of one layer or a plurality of layers, a water-soluble film, and an intermediate layer interposed between the outer layer film and the water-soluble film, and at least a surface on the side of the water-soluble film is desired. And an intermediate layer containing high-pressure polyethylene that has been oxidized to a degree of, the strong adhesion between the outer layer film and the intermediate layer, and the direct contact between the intermediate layer and the water-soluble film. It is weakly adhered so that it can be peeled off.

[0015] It should be noted that strong adhesion means that adhesion is performed with an adhesive force that makes peeling between them substantially difficult, and weak adhesion means adhesion that is weaker than the strong adhesion and that peeling is possible. Adhesion with a certain degree of adhesive strength.

A laminate film according to a second aspect of the present invention is the laminate film according to the first aspect, wherein the intermediate layer contains an ethylene / α-olefin copolymer elastomer mixed with the high-pressure polyethylene. .

The laminate film according to the third aspect of the present invention is the laminate film according to the first or second aspect, wherein the carbonyl group of the oxidized high-pressure polyethylene on the surface of the intermediate layer and the water-soluble film. The hydroxyl groups on the surface are bonded.

A laminate film according to a fourth aspect of the present invention is the laminate film according to any one of the first to third aspects, wherein the water-soluble film is polyvinyl alcohol, vinyl acetate, vinyl acetate resin, polyacrylamide. , Polyethylene oxide, and polyvinylpyrrolidone.

The laminated film according to the fifth aspect of the present invention is the laminated film according to any one of the first to fourth aspects, wherein the water-soluble film has a corona on the intermediate layer side surface. It has been processed.

In the method for producing a laminated film according to the sixth aspect of the present invention, a melted and thermally oxidized high-pressure polyethylene is formed into a film between a water-soluble film and an outer layer film composed of one or more layers. The film is extruded, and the outer layer film, the water-soluble film, and the film-shaped high-pressure polyethylene are cooled while being pressed.

The method for producing a laminated film according to the seventh aspect of the present invention is characterized in that a melted and thermally oxidized high-pressure polyethylene and ethylene / α are formed between an outer layer film consisting of one or more layers and a water-soluble film. A mixture containing an olefin copolymer elastomer is extruded in a film shape, and the outer layer film, the water-soluble film and the film mixture are cooled while being pressure bonded.

The method for producing a laminated film according to an eighth aspect of the present invention is the method for producing a laminated film according to the sixth or seventh aspect, wherein the film-like high-pressure polyethylene or the film-like mixture is added before the crimping. The ozone is sprayed onto the surface of the water-soluble film side.

The method for producing a laminated film according to a ninth aspect of the present invention is the method for producing a laminated film according to the sixth to eighth aspects, wherein the surface of the water-soluble film on the side of the outer layer film is provided before the pressure bonding. Corona treatment.

A bag body according to a tenth aspect of the present invention uses the laminate film according to any one of the first to fifth aspects, and the laminate film is superposed so that the water-soluble film is on the inside, and the bag is predetermined. The portions are heat-sealed to weld the water-soluble films facing each other at the predetermined portions to form a bag shape with one side open.

The bagged body according to the eleventh aspect of the present invention is
Between the water-soluble film which uses the laminated film in any one of Claims 1 thru | or 5, the said laminated film is overlap | superposed so that the said water-soluble film may be inside, and a predetermined location may be heat-sealed, and the said predetermined location is faced. The desired container is housed inside the bag which is welded and sealed.

A bag package according to the twelfth aspect of the present invention is
In the bagged body according to the eleventh aspect, perforations for separation are formed in the heat-sealed portion.

A bag package according to the thirteenth aspect of the present invention is
A laminate film according to any one of the first to fifth aspects, wherein a laminate film in which the water-soluble film is not laminated at a predetermined edge portion of the outer layer film is used. Inside the bag body in which the film is placed inside and the edge portions are overlapped and heat-sealed at predetermined positions so as to face each other and the water-soluble films facing each other at the predetermined positions are welded and sealed, It is the one that contains the contents.

A bagging body according to the fourteenth aspect of the present invention is
The bagged body according to the eleventh aspect has a non-heat-sealed portion surrounded by a heat-sealed portion and in which the contained material is not accommodated, and a notch for separation is formed at an edge portion corresponding to the non-heat-sealed portion. It is a thing.

A bagged body according to the fifteenth aspect of the present invention is
In the bagged body according to the eleventh to fourteenth aspects,
The contained material is a pesticide, a medicine, a food, or a bait for fishing.

A method for producing a laminated film according to a sixteenth aspect of the present invention is the method for producing a laminated film according to any one of the sixth to ninth aspects, wherein the water-soluble film is dried.

Here, the presumed basic principle of weak adhesion in the laminated film according to the first to fifth aspects will be described.

From the conventional common general knowledge in the field of laminate films, direct adhesion between high-pressure polyethylene and water-soluble film (adhesion without an adhesive)
Is considered difficult, and there is no case where such bonding is performed in the field of a laminate film.
In the lamination technology, there is extrusion lamination other than adhesive lamination, in which a plurality of films are directly bonded without using an adhesive. However, in the field of lamination technology, extrusion lamination has been established as a technique for firmly bonding and integrating a plurality of films, and is used for extruding lamination to weakly bond between a plurality of films so as to be peelable. There is no example of using extrusion lamination for weak adhesion between a plurality of films. In particular, there has been no use of extrusion lamination for direct adhesion between high pressure polyethylene and water soluble film.

The high-pressure polyethylene has a repeating unit represented by the following chemical formula 1, and its terminal group is a hydrogen bond and is nonpolar. On the other hand, the terminal groups of the water-soluble film is hydroxyl -OH ^- having a polar group. For this reason, it is considered that direct adhesion (adhesion without an adhesive) between the two is difficult.

[0034]

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However, as a result of research, the inventors of the present invention have found that when the surface of a film having high-pressure polyethylene is oxidized, the adhesive having a bonding force (peeling force) according to the degree of oxidation is high-pressure polyethylene and a water-soluble film. And found that it is possible between.

That is, when high-pressure polyethylene is oxidized, the portion of high-pressure polyethylene that depends on the degree of oxidation is represented by the following chemical formula 2. On the other hand, a water-soluble film, for example, polyvinyl alcohol, has a repeating unit represented by Chemical Formula 3, and its structural formula is represented by Chemical Formula 4.

[0037]

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[0038]

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[0039]

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Therefore, as shown in Chemical Formula 5 below, it becomes possible to form a bond having a relatively weak bond strength between the carbonyl group of the oxidized high-pressure polyethylene and the hydroxyl group of polyvinyl alcohol. Thus, the bonding produces an adhesive force between the oxidized high-pressure polyethylene film and the polyvinyl alcohol film, thereby enabling direct bonding between the two. Then, since the amount of carbonyl groups in the oxidized high-pressure polyethylene changes depending on the degree of oxidation, the adhesive force between the oxidized high-pressure polyethylene film and the polyvinyl alcohol is determined by the oxidation of the high-pressure polyethylene. It can be adjusted depending on the degree. And since other water-soluble films also have a hydroxyl group, such a principle is applicable to not only a polyvinyl alcohol film but also other water-soluble films.

[0041]

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According to this principle, in the laminated film according to the first aspect, at least the surface on the side of the water-soluble film is directly oxidized between the intermediate layer containing high-pressure polyethylene and the water-soluble film. It is thought that weak adhesion can be made so that it can be peeled off in contact with.

For the outermost layer of the film for the outer layer in the first embodiment, for example, a layer capable of thermally adhering high-pressure polyethylene is used (a material capable of strongly adhering molten high-pressure polyethylene). Well, this allows strong adhesion to be achieved between the outer layer film and the intermediate layer.

As the outer layer film used in the present invention, for example, various outer layer films used in the above-described conventional laminated film can be adopted. Specifically, as the outer layer film, for example, (1) polyester film alone, (2) paper alone,
(3) Heat-bonded polyester film on paper (paper is the intermediate layer side), (4) Polyester film, adhesive layer, aluminum foil layer, adhesive layer, and polyester film are laminated in this order. Dry laminated with each of the adhesive layers, (5) aluminum vapor-deposited polyester film (aluminum-deposited polyester film), adhesive layer, and polyester film are laminated in this order, and dry laminated with the adhesive layer. And the like (the polyester film is used as the intermediate layer side), and the like.

Further, the oxidation of the high-pressure polyethylene is carried out by, for example, heating the high-pressure polyethylene to a high temperature (for example, bringing the high-pressure polyethylene into a molten state), and the oxidation by the oxygen in the air promoted by this high temperature (in this specification). Then, this oxidation may be referred to as thermal oxidation) or may be forcedly performed by blowing ozone (in the present invention, this oxidation is referred to as forced oxidation), or thermal oxidation and forced oxidation. It may be oxidation by both oxidation. For example, in the case of thermal oxidation, the amount of oxidation can be adjusted by changing the temperature of high-pressure polyethylene, and in the case of forced oxidation, the amount of oxidation can be adjusted by changing the concentration of ozone sprayed.

As in the case of the second embodiment, when a mixture of high-pressure polyethylene and an ethylene / α-olefin copolymer elastomer is used for the intermediate layer, the intermediate layer and the intermediate layer are mixed depending on the mixing amount. It has been found that the adhesion between the water-soluble film and the film can be adjusted. Also, like this,
Mixing the ethylene / α-olefin copolymer elastomer increases the flexibility of the intermediate layer. Therefore, even though the water-soluble film easily expands and contracts, the intermediate layer can follow the expansion and contraction of the water-soluble film, resulting in unintended peeling between the intermediate layer and the water-soluble film due to expansion and contraction of the water-soluble film. Is less likely to occur. In addition,
Instead of or in addition to the ethylene / α-olefin copolymer elastomer, a substance having similar chemical properties may be mixed.

Further, as the water-soluble film, those made of various substances can be used as exemplified in the fourth embodiment. For example, the water-soluble film may be a water-soluble synthetic polymer film such as partially saponified polyvinyl alcohol. Further, for example, a water-soluble polyvinyl alcohol film can be used as the water-soluble film. Examples of the water-soluble polyvinyl alcohol film include partially saponified products of polyvinyl acetate or polyvinyl alcohol modified with maleic acid, itaconic acid or the like. The range of saponification degree is
70 to 98 mol% and the degree of polymerization may be in the range of 500 to 3000. Such a saponification degree and a polymerization degree can be appropriately determined in consideration of the degree of water solubility, film strength, time for dissolving in water, and the like.

Further, the water-soluble film is, for example, (1)
It may be a film made of unmodified partially saponified polyvinyl alcohol, (2) a film made of carboxylic acid-modified polyvinyl alcohol, or (3) made of modified polyvinyl alcohol having an oxyalkylene group or a cationic group introduced. It may be a film or a film made of (4) a modified polyvinyl alcohol containing a sulfonic acid group. Examples of the water-soluble film made of a modified polyvinyl alcohol containing a sulfonic acid group include a water-soluble film made of a modified polyvinyl alcohol disclosed in JP-A-7-118407. This water-soluble film has the following chemical formula
0.1 to 20 mol% of the sulfonic acid group-containing unit represented by
The modified polyvinyl alcohol contained is formed into a film.

[0049]

[Chemical 6]

In the chemical formula 6, R ₁ is hydrogen or a lower alkyl group, R ₂ is an alkyl group, R ₃ , R ₄ and R ₅ are hydrogen or an alkyl group, M is hydrogen, an alkali metal, an ammonium group or an amine, respectively. .

Further, the water-soluble film may be one in which the surface on the side of the intermediate layer is corona-treated as in the fifth embodiment. Generally, corona treatment is 100mm
It is a means for modifying the surface of a material, particularly a polymer material, by corona discharge in the air of Hg or more and usually at atmospheric pressure, and is useful for improving adhesiveness and the like. In addition, if this corona treatment is performed, a small amount of ozone gas is generated by corona discharge, so this ozone gas can be used to blow the molten high-pressure polyethylene to forcibly oxidize the surface of the high-pressure polyethylene. Become.

The laminated film according to the first to fifth aspects can be produced, for example, by the production method according to the sixth to ninth aspects.
This is based on the extrusion lamination method.
In addition, in these manufacturing methods, since the high pressure method polyethylene which is melted is used, the temperature of the high pressure method polyethylene is high, and the high pressure method polyethylene is thermally oxidized. The amount of oxidation by thermal oxidation is determined by the temperature of the high-pressure polyethylene and the time of exposure to air. The eighth
In this mode, ozone is sprayed to further increase the oxidation amount of the high-pressure polyethylene. As this ozone, ozone generated by corona treatment as described above may be used, or ozone generated by the ozone generator may be blown by using an ozone generator.

The bag according to the tenth aspect is provided with the first bag.
It is an example of a bag body configured by using the laminate film according to the fifth aspect, and is generally supplied from the bag manufacturer or the like to the manufacturer of the contained material or the like in the bag supply system described above. is there. The bag pack according to the eleventh aspect is the same bag body as the bag body according to the tenth aspect configured by using the laminate film according to the first to fifth aspects, and is a completely sealed bag. This is the final form in which the desired contents are contained inside the body, and the contents reach the user's hand. The bag-filled body according to the eleventh aspect may be manufactured by using the bag body according to the tenth aspect according to the bag feeding method described above, or according to the first to fifth aspects according to the automatic packaging method described above. It may be manufactured using a laminate film.

According to the laminated film according to the first to fifth aspects, the outer layer film and the intermediate layer are strongly adhered to each other, and the intermediate layer and the water-soluble film are directly in contact with each other and can be peeled off. Since it is weakly adhered to the bag, the bag body of the bag package according to the eleventh aspect using the laminate film has a strongly adhered outer layer film and an intermediate layer which act as outer bags (for convenience of explanation, these whole Is referred to as "outer bag film") and a water-soluble film that acts as an inner bag, and the outer bag film and the water-soluble film are weakly adhered to each other in a peelable manner. Become. Therefore, the user of the contained item can obtain the contained item in the state of being contained in the inner bag made of the water-soluble film, by peeling only the outer bag film, similarly to the method of the inner bag and the outer bag described above. It does not roll up the contents such as pesticides and can be put into a tank etc. without taking out the contents from the inner bag and just add water to dilute it. Since the inner bag dissolves), the human body can be prevented from being harmed and safety can be secured, and the handling thereof becomes extremely easy.

Since the laminated film according to the first to fifth aspects can be handled in the same manner as the conventional laminated film when accommodating the contained items,
Existing equipment such as automatic machines can be used as they are. Also, unlike the inner bag and outer bag methods described above, the inner bag is not manufactured separately, so that the manufacturing cost is not so much required.

Further, in the laminated film according to the first to fifth aspects, only the bond between the carbonyl group of the high-pressure method polyethylene oxidized as described above and the hydroxyl group of the water-soluble film is generated, and the high-pressure method is adopted. There is no risk that polyethylene and the water-soluble film will cause other chemical reactions even with time. Therefore, unlike the above-described method using an adhesive, the characteristics of the high-pressure polyethylene or the water-soluble film are less likely to change with time, and the time between the intermediate layer and the water-soluble film is stable. The obtained adhesive strength can be obtained. Therefore, it is difficult for the user to peel the outer bag film from the water-soluble film when using the stored item, or the outer bag film may peel off before reaching the user, There is no possibility that a pinhole or the like is generated in the conductive film or the water solubility of the water-soluble film is reduced. As described above, the adhesive force between the outer bag film and the water-soluble film (that is, between the intermediate layer and the water-soluble film) is determined by the carbonyl group of the oxidized high-pressure polyethylene and the hydroxyl group of the polyvinyl alcohol. This is caused by a bond having a relatively low bond strength between the water-soluble film and the water-soluble film. Therefore, the components of the intermediate layer react with the components of the storage material such as the pesticide in the tank or the like after the water-soluble film is dissolved in water at the time of using the storage material such as the pesticide, and the content such as the pesticide deteriorates. There is no such fear. Further, unlike the adhesive, the thickness of the intermediate layer can be made relatively thick, so that a function as protection against mechanical impact can be added to the intermediate layer. Furthermore, in the case of an adhesive, pinholes are generated by application, so that the moistureproof effect is not sufficient. However, since such pinholes do not occur in the intermediate layer, the intermediate layer also has an effect of enhancing the moistureproofness.

In the bag packaged body according to the eleventh aspect, as in the fifteenth aspect, the contents are not limited to pesticides, and may be, for example, medicines, foods, sprinkles for fishing, or the like. May be. Even if it is a container other than these, it is used by putting it in a liquid or the like in which the water-soluble film dissolves, and for example, it may be dangerous, smell or dirty when touched by humans This is particularly effective. Further, the form of the contained material is not limited to the powder, and may be a granule or a liquid. In addition, even if it is a liquid, for example, an organic solvent or the like does not dissolve the water-soluble film.

By the way, in the bag-filled body according to the eleventh aspect, it is inconvenient and inconvenient for the user of the contained object to peel off the outer bag film unless there is a portion that triggers the peeling of the outer bag film. The bagging body according to the twelfth to thirteenth aspects is an example in which such a trigger is formed.

In the bag package according to the twelfth aspect, since the perforation for separation is formed in the heat-sealed portion, the heat-sealed portion is torn off along the perforation to form the outer bag film. Since the elongation amount of the water-soluble film and the elongation amount of the water-soluble film are different, the extended portions of the both are separated, and this portion triggers the peeling of the outer bag film.

In the bag package according to the thirteenth aspect, the edge portion of a predetermined portion of the outer layer film on which the water-soluble film is not laminated is faced with a shift, and since this portion is not adhered, this portion is not covered. It triggers the peeling of the bag film.

In the bag-filled body according to the fourteenth aspect, the outer bag film is stretched by tearing from the notch for separation to the non-heat-sealed portion surrounded by the heat-sealed portion and containing no contents. Since the amount and the elongation of the water-soluble film are different, the extended portions of the both are separated, and this portion triggers peeling of the outer bag film.

[0062]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 is a sectional view schematically showing a laminated film according to an embodiment of the present invention.

As shown in FIG. 1, the laminated film according to the present embodiment comprises an outer layer film 20, a water-soluble film 6, and an intermediate layer 5 interposed between the outer layer film 20 and the water-soluble film 6. And an intermediate layer 5 containing high-pressure polyethylene oxidized to a desired extent on at least the side of the water-soluble film 6. Then, the outer layer film 20 and the intermediate layer 5 are strongly bonded. The intermediate layer 5 and the water-soluble film 6 are in direct contact with each other and are peelably weakly bonded.

In the present embodiment, the outer layer film 20 comprises a base film 10 formed by dry lamination of a polyester film 1, an adhesive layer 2 and an aluminum vapor-deposited polyester film 3, and an aluminum vapor-deposited polyester film 3.
And an anchor coat agent layer 4 for improving the adhesion between the intermediate layer 5 and the intermediate layer 5.

Specifically, as the polyester film 1, a product called "Embred PET" manufactured by Unitika Ltd., which is PET ^{# 12} , was used. As the aluminum-evaporated polyester film 3, a product called "MLPET-C" manufactured by Tocello Co., Ltd., which is MLPET ^{# 12} , was used.

The intermediate layer 15 is made of LDPE (high-pressure low-density polyethylene), which is a type of high-pressure polyethylene, and is manufactured by Showa Denko K.K. A layer having a thickness of 20 μm was formed by extrusion laminating using a material obtained by mixing a product called “Toughmer” manufactured by Mitsui Petrochemical Co., Ltd., which is an olefin copolymer elastomer, in various proportions as described below.

As the water-soluble film 6, a polyvinyl alcohol film manufactured by Kuraray Co., Ltd. was used.

The inventor of the present invention actually manufactured a plurality of types of laminated films having such a constitution by changing only a part of predetermined manufacturing conditions and the material of the intermediate layer 5, as described later. The manufacturing method was as follows.
FIG. 2 is a view schematically showing a part of the manufacturing process.

First, "Embred PET" (polyester film 1) and "MLPET-C" (aluminum vapor-deposited polyester film 3) were dry laminated with an adhesive 2 to prepare a base film 10. Then, as shown in FIG. 2, it is guided between the pressure roller 32 and the cooling roller 33 of the laminating machine 30 via the guide roller 31 of the laminating machine 30. The base film 10 is made of “M
LPET-C "(aluminized polyester film 3)
2 is arranged as an upper side in FIG. 2 and an anchor coating agent 4
Has already been applied to form the outer layer film 20. On the other hand, a polyvinyl alcohol film (water-soluble film 6) manufactured by Kuraray Co., Ltd. is guided between the pressure roller 32 and the cooling roller 33 from the side opposite to the outer layer film 20 via the guide roller 34 of the laminating machine 30. . At the same time, a molten intermediate layer material (a material to become the intermediate layer 5) described later is extruded between the outer layer film 20 and the polyvinyl alcohol film 6 from above the position between the pressure roller 32 and the cooling roller 33. It is extruded into a film by the machine 40. As a result, the outer layer film 20, the film-shaped intermediate layer substance, and the polyvinyl alcohol 6 are cooled while being pressed by the pressure roller 32 and the cooling roller 33, and become the above-described laminated film shown in FIG. 1 and guided to the guide roller 35. And is wound up as shown in FIG. 4 (a) and FIG. 6 (a) described later.

As the extruder 40, L / D = 32
And D = 90 mmφ was used. Here, L indicates the length of the screw, and D indicates the diameter of the screw. The take-up speed of the laminating machine 30 was 100 m / min.

Then, the intermediate layer material (the material which becomes the intermediate layer 5) is changed to four kinds of A, B, C and D, and the extruder 40 for the intermediate layer material is respectively related to each kind.
The temperature before extrusion was 320 ° C, 325 ° C, 330 ° C.
The three temperatures of ３C were set respectively, and the other conditions were completely the same, and a total of eight kinds of laminated films having the structure shown in FIG. 1 were manufactured.

Here, the intermediate layer substance A is 100% by weight of "L178" (high-pressure polyethylene), and the intermediate layer substance B is 97% by weight of "L178" and 3% by weight of "Toughmer".
(Ethylene / α-olefin copolymer elastomer), the intermediate layer material C was a mixture of 95% by weight of “L178” and 5% by weight of “tuffmer”, and the intermediate layer material C was 9%.
It is a mixture of 0% by weight of "L178" and 10% by weight of "Tuffmer".

The peel strength (adhesive strength or adhesive strength) between the water-soluble film 6 and the film composed of the outer layer film 20 and the intermediate layer 5 of the eight kinds of laminated films thus obtained is shown in the table below. It was as shown in 1. The peel strength was measured using a horizontal tensile tester manufactured by Tester Sangyo Co., Ltd. under the conditions of 180 ° peeling at a width of 15 mm.
The measurement was performed according to JIS P8113. In addition, for each type of laminated film, several tens of pieces were cut out from each part, and the respective peel strengths were measured. Table 1 shows the range of measured values obtained for each piece for each type of laminated film.

[0075]

[Table 1]

From Table 1, it is understood that the peel strength is changed by changing the mixing amount of the ethylene / α-olefin copolymer elastomer with respect to the high pressure polyethylene in the mid layer 5. Also, it can be seen that the higher the temperature of the intermediate layer material, the higher the peel strength. This means that it is obvious that the higher the temperature, the higher the oxidation amount of the high-pressure polyethylene due to the thermal oxidation. . Further, in the range of this data, a peel strength of 0.2 to 40.3 g / 15 mm was obtained as a whole. In the present specification, the adhesive strength of the weak adhesive is not limited to such a range.

Even if the film comprising the outer layer film 20 and the intermediate layer 5 is peeled from the water-soluble film 6,
No situation was confirmed in which the components of the mid layer 5 remained in the water-soluble film 6.

Then, with respect to the sealed bag body manufactured by using the laminate film manufactured by the intermediate material layer A under the condition of 330 ° C., even after 48 hours have passed in the environment of 90% humidity and room temperature, 3 at room temperature with 30% humidity
Even after a lapse of weeks, no change was observed in the peel strength in any case.

Since the peel strength can be increased as the oxidation amount of the high-pressure polyethylene is increased, when a higher peel strength is required, the temperature of the intermediate layer material is further raised, and not only thermal oxidation, Forced oxidation may be performed by blowing ozone onto the molten intermediate layer material.

In that case, for example, as shown in FIG. 3, a corona treatment machine 50 is installed, and ozone discharged from the corona treatment machine 50 is converted into a film-shaped intermediate layer substance extruded from the extrusion machine 40. It may be sprayed on the surface of the water-soluble film 6. In this example, since ozone is generated using the corona treatment device 50, corona discharge is necessary for ozone generation. Therefore, the water-soluble film 6 is subjected to corona treatment by the corona treatment device 50 before pressure bonding. . In this case, the adhesive force between the water-soluble film 6 and the intermediate layer 5 can be adjusted by physically changing the surface of the water-soluble film 6 by corona treatment (for example, roughening the surface). it is conceivable that. However, without using the corona treatment device 50, ozone is blown onto the surface of the water-soluble film 6 of the film-like intermediate layer material extruded from the extruder 40 using an ozone generator (not shown). Is also good. Further, while corona treatment is performed on the water-soluble film 6 by using the corona treatment machine 50, the ozone discharged from the corona treatment machine 50 is not directly sprayed on the filmy intermediate layer substance extruded from the extruder 40, but is simply as it is. It may be exhausted.

Further, as a result of the experiment, it was found that when the water content of the water-soluble film 6 becomes high, the adhesive force between the water-soluble film 6 and the intermediate layer 5 is lowered. Therefore, in order to obtain a desired adhesive strength stably, the water-soluble film 6 is
When stored in advance, it is preferable to store in a humidity control chamber so that the water content maintains a predetermined value. Even when the water-soluble film 6 is stored as described above, the water content of the water-soluble film 6 may vary depending on the ambient humidity when the laminated film is manufactured. In such a case, for example, as shown in FIG. 7, in order to stably obtain a desired adhesive force, a drying chamber 2000 is installed, and the water-soluble film 6 is passed through the drying chamber 2000 before pressure bonding. The water-soluble film 6 may be dried. The drying chamber 2000 can be configured using, for example, a far infrared ray generating device.

The inventors of the present invention further used, as laminated films according to other examples of the present invention, other various laminated films having the basic structure shown in FIG. 1 (the laminated films of Sample Nos. 1 to 19). Was manufactured. Then, the sample No. Peel strength (adhesive strength or adhesive strength) between the water-soluble film 6 and the film including the outer layer film 20 and the intermediate layer 5 of the laminated films 1 to 19
Was measured. The measurement results are shown in Table 2 below. In addition,
The measurement of the peel strength in this case also employed the same measurement method as the method of measuring the peel strength in the case of Table 1 above. The peel strength shown in Table 2 is measured at 40 ° C. after the laminated film is manufactured.
It was carried out after it was stored for 48 hours in the greenhouse which was maintained at.

[0083]

[Table 2]

Sample No. In the laminated films 1 to 19, as the water-soluble film 6, a product called “Toslon ET-20 ^# 35” manufactured by Tohcello Co., Ltd., which is a polyvinyl alcohol film having a thickness of 35 μm, was used.

Sample No. In the laminated films 1 to 10, the outer layer film 20 includes the polyester film 1, the adhesive layer 2, and the aluminum vapor-deposited polyester film 3.
A base film 10 formed by dry laminating
It is composed of an aluminum vapor-deposited polyester film 3 and an anchor coat agent layer 4 for improving the adhesion between the intermediate layer 5. Then, the sample No. In the laminated film of 1 to 10, as the polyester film 1, PE
T ^{# 12} "Embred PE" manufactured by Unitika Ltd.
The product referred to as "T" was used, and as the aluminum-deposited polyester film 3, a product referred to as "MLPET-C" manufactured by Tohcello Co., Ltd., which is MLPET ^{# 12} , was used.

Sample No. In the laminated films 11 to 19, the outer layer film 20 is a base film 10 formed by extrusion lamination including a polyester film 1, a high-pressure polyethylene film 2 and an aluminum foil 3.
And an anchor coat agent layer 4. Then, the sample No. In the laminated films 11 to 19, as the polyester film 1, a product called "Embred PET" manufactured by Unitika Ltd., which is PET ^{# 12} , is used.
A product called "L178" manufactured by Japan Polyolefin Co., Ltd. (a high-pressure low-density polyethylene) -made polyolefin company (a company established by the merger of the resin department of Showa Denko KK and the resin department of Nippon Petrochemical Co., Ltd.) Using a 25 μm thick film made of
An aluminum foil manufactured by Showa Aluminum Co., Ltd. having a thickness of 7 μm was used.

Sample No. In the laminated films 1 to 19, the intermediate layer 5 is LDPE (high-pressure low-density polyethylene), which is a type of high-pressure polyethylene, and is used by Japan Polyolefin Co., Ltd. (Showa Denko Co., Ltd. resin department and Nippon Petrochemical Co., Ltd. resin department). "Tufmer" manufactured by Mitsui Petrochemical Co., Ltd. which is an ethylene / α-olefin copolymer elastomer, only the product called "L178" manufactured by the merger of A product having a thickness of 25 μm was formed by extrusion laminating using a product obtained by mixing various products described below in various proportions.

The material of the intermediate layer to be the intermediate layer 5 was Sample No.
In the laminated film of 1, 2, 3, 4, 11, 12, and 13, 100% by weight of "L178", sample No. 5,1
97% by weight of "L178" for the laminated film of No. 4
And 3% by weight of "Toughmer", sample No. 6,
In the laminated film of No. 15, 95% by weight of "L17
8 "and 5% by weight of" Tufmer ", sample No.
In the laminated films of 7 to 10 and 16 to 19, a mixture of 90% by weight of "L178" and 10% by weight of "Toughmer" was used.

Sample No. As the method for manufacturing the laminated film of Nos. 1 to 19, the same manufacturing method as that described above with reference to FIG. 2 was adopted. However, the sample No. 2 to 4, 8
At the time of manufacturing the laminated films of Nos. 10, 12, 13, 17, and 19, the water-soluble film 6 was subjected to corona treatment using the corona treatment machine 50 as shown in FIG. However, the ozone discharged from the corona treatment machine 50 was not exhausted to the film-shaped intermediate layer substance extruded from the extrusion machine 40, but was simply exhausted. At this time, as the corona processor 50, a product called "roll electrode station" manufactured by Tomoe Kogyo Co., Ltd. was used. Sample No. At the time of manufacturing 2, 12 laminated films, 1.0 kW, sample N
o. When the laminated films of Nos. 3, 8, 13, and 17 were manufactured, the sample No. When the laminated film of No. 4 was manufactured, it was 1.8 kW, and the sample No. When the laminated films of Nos. 9 and 18 were manufactured, the sample No.
3.0K when manufacturing 10, 19 laminated films
Corrosion treatment was performed on each of W. Sample No. 1,5-
No corona treatment was performed on the water-soluble film 6 during the production of the laminated films of 7, 11, and 14 to 16.

Sample No. When manufacturing the laminated films of 1 to 19, L / D =
32, D = 90 mmφ, laminating machine 3
The take-up speed of 0 was 100 m / min. Sample N
o. Extruder 40 for the intermediate layer material (intermediate layer 5) at the time of manufacturing the laminated films 1 to 19
The temperature before extrusion was set to 330 ° C.

From Table 2, depending on the mixing amount of the ethylene / α-olefin copolymer elastomer, the presence / absence of corona treatment, and the degree thereof in the high-pressure polyethylene in the intermediate layer 5,
It can be seen that the peel strength changes. In addition, the sample No. 1
In the laminated film of Nos. 19 to 19, a film composed of the outer layer film 20 and the intermediate layer 5 is replaced with a water-soluble film 6.
Even if it is peeled off from the water-soluble film 6
No situation was confirmed that would remain.

As another example of the commercial product of the water-soluble film 6, for example, a product called "VF-HP" manufactured by Kuraray Co., Ltd., which is a polyvinyl alcohol film, can be mentioned.

Next, an example of a bag body constructed by using the laminate film shown in FIG. 1 will be described with reference to FIG.

FIG. 4A shows the laminated film shown in FIG. 1, in which the water-soluble film 6 is laminated on the entire surface of the outer layer film 20 and wound into a roll. 4B to 4D are respectively shown in FIG.
Using the laminate film shown in (a), the laminate films are folded and overlapped so that the water-soluble film 6 is on the inside, and heat-sealing is applied to predetermined portions to weld the water-soluble films 6 facing each other at the predetermined portions. , An example of a bag body formed in a bag shape with one side opened. In the bag shown in FIG. 4B, the left side, the right side, or the lower side is a folding line, and the portion 60 along the left side, the portion 61 along the right side, and the portion 62 along the lower side are heat-sealed, and the upper side is opened. However, it is a so-called three-sided seal bag. In the bag shown in FIG. 4C, the right side is a fold line, the part 70 along the left side and the part 71 along the right side are heat-sealed, and the upper side is opened to form a so-called L-shaped seal bag. . In the bag shown in FIG. 4D, the left side and the right side are fold lines, the back-to-back portion 80 and the portion 81 along the lower side are heat-sealed, and the upper side is opened,
It is a so-called backing bag. The form of the bag is not limited to such a form, and the laminate film according to the present invention can be used to make a bag of any form such as a gusset type bag.

In the case of the bag feeding system, the bag body shown in FIGS. 4 (b) to 4 (d) which is open at the upper side is manufactured by the bag manufacturer and supplied to the manufacturer of the contents. is there. In the case of the bag supply method, in the manufacturer of the contents, etc., after the contents are put into the bag body from the opening of the upper side shown in FIGS. 4 (b) to (d), the portion 63 along the upper side, 72,8
2 is heat-sealed to complete a bag-filled body, which is the final form and reaches the user's hand of the contained item. In the case of the automatic packaging method, in the manufacturer of the stored items, while filling the bags shown in FIGS. 4 (b) to 4 (d) from the laminated film shown in FIG. Is for continuously heat-sealing the parts 63, 72, 82 along the upper side.

The bag body of the bag-filled body includes a strongly adhered outer layer film 20 acting as an outer bag and an intermediate layer 5 (for convenience of explanation, these are collectively referred to as "outer bag film 20, 5") and an inner layer. The water-soluble film 6 acting as a bag has a double structure, and the outer bag films 20 and 5 and the water-soluble film 6 are weakly adhered to each other in a peelable manner. Therefore, the user of the contained item is
By peeling off only 0 and 5, it is possible to obtain the contents contained in the inner bag of the water-soluble film 6 as in the case of the inner bag and outer bag described above.

By the way, in the bag-filled body using the bag shown in FIGS. 4 (b) to 4 (d), there is no portion that triggers the peeling of the outer bag films 20 and 5, and the user of the contained article can use the outer bag. It is inconvenient and time-consuming to peel off the films 20 and 5. The example shown in FIGS. 5 and 6 in which such a trigger is formed will be described below.

FIG. 5A shows a seal portion 62 of the three-sided seal bag shown in FIG. 4B in which perforations 64 for separation are formed. A cutout portion 65 is formed at the end of the perforation 64. In the bag-filled body using the bag shown in FIG. 5A, the amount of expansion of the outer bag films 20 and 5 and the water-soluble film 6 can be obtained by tearing off the lower part of the heat-sealed portion 62 along the perforations 64. Since the amount of expansion of the outer bag film 20 is different from the amount of expansion of the outer bag film, the extended parts of the two are separated, and this part triggers the peeling of the outer bag films 20 and 5. In addition, in this example, since the notch portion 65 is formed, it is easy to tear along the perforations 64, which is preferable, but the notch portion 65 does not necessarily have to be formed. It should be noted that the perforations 64 and the notches 65 may be formed after filling the contents in the bag shown in FIGS. 4B to 4D.

In FIG. 5B, the three-sided sealing bag shown in FIG. 4B is further heat-sealed on a portion 67 along the lower side, which is parallel to the portion 62 and is slightly spaced from the portion 62. A non-heat-sealed portion 68 surrounded by the heat-sealed portion and in which an object is not accommodated is provided, and notches 69a and 69b for separation are formed at an edge portion corresponding to the non-heat-sealed portion 68. Further, perforations 69c are formed so as to pass through the non-heat-sealed portion 68 between the cutout portions 69a and 69b. In the bag-filled body using the bag shown in FIG. 5B, the outer bag films 20 and 5 are cut off by tearing from the notch 69a or the notch 69b to the non-heat-sealed portion 68 along the perforations 69c. Since the stretched amount and the stretched amount of the water-soluble film 6 are different, the extended portions of both are separated, and this portion is the outer bag film 2
It triggers the peeling of 0,5. In this embodiment, since the two cutouts 69a and 69b and the perforation 69c are formed, the tearing is easy, which is preferable. However, one of the two notches 69a and 69b and the perforation 69c may not be formed.

FIG. 6 (a) shows the laminated film shown in FIG.
The water-soluble film 6 is laminated except for 20b and wound into a roll. In addition, in this example, the intermediate layer 5 is not formed on the edge portions 20a and 20b, but the intermediate layer 5 may be formed. The edge portions 20a and 20b may be the base film 10 only. The width of the edge portion 20b is wider than the width of the edge portion 20a. The bag body shown in FIG. 6 (c) uses the laminated film shown in FIG. 6 (a), and the laminated film is bent at the center line of the portion where the water-soluble film 6 is laminated so that the water-soluble film 6 is placed inside. In addition, the edge portions 20a and 20b are overlapped with each other so as to face each other with a shift (a side view of this state is shown in FIG. 6B) and heat-sealed at a predetermined location to face the water-soluble film at the predetermined location. 6 is welded and formed in a bag shape with one side open. In this example, the left side in FIG. 6C is a folding line, and a portion 90 along the left side, a portion along the upper side (excluding the edge portions 20a and 20b) 91 and a portion along the lower side (the edge portion 20a). , 20b) 92 is heat-sealed, and the right side is open.

The bag having the right side opening shown in FIG.
In the case of the bag supply method, the bag is manufactured by a bag manufacturer or the like and supplied to the manufacturer of the contents. In the case of the bag-supplying method, the manufacturer of the contained items, etc.
A portion (excluding the edge portions 20a20b) along the right side after the contents are put into the bag body shown in (c) through the opening on the right side 9
3 is heat-sealed to complete a bag-filled body which is the final form and reaches the user's hand of the contained item. In the case of the automatic packaging method, in the manufacturer of the stored items, while filling the bag shown in FIG. 6 (c) from the laminated film shown in FIG. 6 (a), filling the stored items and further along the right side The heat-sealing of the open portion 93 is continuously performed.

In the bag-filled body using the bag shown in FIG. 6 (c), the edge portions 20a and 20b of the predetermined portion of the outer layer film 20 on which the water-soluble film 6 is not laminated are faced with being displaced. Since they are not adhered to each other, these portions 20a and 20b serve as a trigger for peeling the outer bag films 20 and 5.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments.

[0104]

As described above, according to the present invention,
A laminated film capable of producing a bag body having a double structure of an outer bag and an inner bag substantially made of a water-soluble film and having an excellent peeling property of the outer bag using existing equipment, and a method for producing the same Also, it is possible to provide a bag and a bag using the same.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a laminate film according to one embodiment of the present invention.

FIG. 2 is a view schematically showing a part of a manufacturing process of a laminated film according to one embodiment of the present invention.

FIG. 3 is a diagram schematically showing a part of a manufacturing process of a laminated film according to another embodiment of the present invention.

FIG. 4 is a view showing a laminated film wound into a roll shape and bags formed by the laminated film according to still another embodiment of the present invention.

FIG. 5 is a diagram showing each bag having a trigger for peeling an outer bag film according to still another embodiment of the present invention.

FIG. 6 is a view showing a laminated film wound into a roll and a bag body made into a bag by the laminated film according to still another embodiment of the present invention.

FIG. 7 is a diagram schematically showing a part of the manufacturing process of the laminated film according to still another embodiment of the present invention.

[Explanation of symbols]

1 Polyester film 2 Adhesive layer 3 Aluminum vapor-deposited polyester film 4 Anchor coat agent layer 5 Intermediate layer 6 Water-soluble film 10 Base film 20 Outer layer film 20a, 20b Edge portion 30 Laminating machine 31, 34, 35 Guide roller 32 Pressure roller 33 Cooling roller 50 Corona treatment machine 60-63, 67, 70-72, 80-82, 90-9
3 Heat seal part 64 Perforation 65,69 Notch part 68 Non heat seal part 2000 Drying room

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location B32B 27/30 B32B 27/30 27/32 27/32 Z 103 103 B65D 30/02 B65D 30/02 65/40 65/40 F 85/00 0333-3E 85/00 C08J 7/00 CES C08J 7/00 CESA 303 303 // B29K 23:00 B29L 9:00

Claims (16)

[Claims] 1. An outer layer film composed of one layer or a plurality of layers, a water-soluble film, and an intermediate layer interposed between the outer layer film and the water-soluble film, which is at least the water-soluble film. The side surface is composed of an intermediate layer containing high-pressure polyethylene that has been oxidized to a desired degree, and the outer layer film and the intermediate layer are strongly bonded together, and the intermediate layer and the water-soluble film A laminated film characterized in that the spaces are in direct contact with each other and are weakly bonded so that they can be peeled off. 2. The laminate film according to claim 1, wherein the intermediate layer contains an ethylene / α-olefin copolymer elastomer mixed with the high-pressure polyethylene. 3. The laminated film according to claim 1, wherein the carbonyl group of the oxidized high-pressure polyethylene on the surface of the intermediate layer is bonded to the hydroxyl group on the surface of the water-soluble film. . 4. The water-soluble film is made of one or more of polyvinyl alcohol, vinyl acetate, vinyl acetate-based resin, polyacrylamide, polyethylene oxide, and polyvinylpyrrolidone. The laminated film according to claim 1. 5. The laminate film according to claim 1, wherein the water-soluble film is a film in which the surface of the water-soluble film on the side of the intermediate layer is corona-treated. 6. An outer layer film, a water-soluble film and a water-soluble film are formed by extruding a high-pressure process polyethylene melted and thermally oxidized between a film for an outer layer consisting of one layer or a plurality of layers and a water-soluble film. A method for producing a laminated film, which comprises cooling the film-shaped high-pressure polyethylene while pressing it. 7. A film containing a mixture of a high-pressure process polyethylene melted and thermally oxidized and an ethylene / α-olefin copolymer elastomer between a water-soluble film and an outer layer film comprising one or more layers. Forming a laminate film, and cooling the outer layer film, the water-soluble film, and the film-like mixture while pressure-bonding the mixture. 8. The ozone is blown onto the surface of the film-like high-pressure polyethylene or the film-like mixture on the side of the water-soluble film before the pressure-bonding.
Or the method for producing a laminated film according to item 7. 9. The method for producing a laminated film according to claim 6, wherein a surface of the water-soluble film on the side of the film for outer layer is subjected to corona treatment before the pressure bonding. 10. The laminate film according to any one of claims 1 to 5, wherein the laminate films are laminated so that the water-soluble film is on the inside, and a predetermined portion is heat-sealed to face the predetermined portion. A bag body, characterized in that the water-soluble films are formed into a bag shape with one side open. 11. The laminate film according to any one of claims 1 to 5, wherein the laminate film is laminated so that the water-soluble film is on the inside, and a predetermined portion is heat-sealed to face the predetermined portion. A bag-filled body, in which desired contents are contained in a bag body obtained by welding and sealing water-soluble films. 12. The bagged product according to claim 11, wherein perforations for separation are formed in the heat-sealed portion. 13. The laminated film according to claim 1, wherein the water-soluble film is not laminated on a predetermined edge portion of the outer layer film, and the laminated film is used. The inside of the bag body in which the water-soluble film is on the inside and the edge portions are overlapped so as to face each other and heat-sealed at predetermined positions to weld and seal the water-soluble films facing each other at the predetermined positions. 1. A bag-filled body, characterized in that it contains desired contents. 14. A non-heat-sealing portion surrounded by a heat-sealing portion and in which the contained material is not accommodated, and a notch for separation is formed at an edge portion corresponding to the non-heat-sealing portion. Item 11. The bagged product according to Item 11. 15. The bagged body according to claim 11, wherein the contained material is a pesticide, a medicine, a food, or a bait. 16. The method for producing a laminated film according to claim 6, wherein the water-soluble film is dried before the pressure bonding.