JP6874367B2 - Film molded body for pouch - Google Patents

Description

The present invention relates to a film molded product used in the production of a pouch (bag-shaped container).

Since the contents of a bag-shaped container (pouch) formed by laminating films can be easily discharged by crushing the container, not only various beverages but also particularly viscous contents, for example, for seasoning. It is widely used as a container for containing slurry or paste-like contents such as sauces, thickened nursing foods, baby foods, and refill shampoos.

However, the above-mentioned viscous contents tend to adhere and remain on the inner surface of the container, and there is a problem that it is difficult to use up the contents filled in the container to the end. For this reason, it has been proposed to form a liquid film on the inner surface of the container that exhibits lubricity to the contents.

For example, Patent Document 1 proposes a packaging container in which a film of an oily liquid such as liquid paraffin or cooking oil is formed on the inner surface, and as this packaging container, a bag-shaped container (pouch) formed by laminating a film. ) Is also described.

In a packaging container having a liquid film formed on its inner surface, for example, in a container such as a bottle, an empty container is generally formed, and then a liquid forming a liquid film is applied to the empty container by spraying or the like, and then the contents. Is filled, capped and used. In this case, the contents are generally delivered to the seller of the contents in the state of an empty container having a liquid film formed on the inner surface, and the contents are filled and capped by the seller. ..

On the other hand, in the case of a pouch, the container maker molds an empty pouch having an opening, delivers it to the sales maker, and the sales maker forms a liquid film on the inner surface of the empty pouch by spraying or the like. Then, a distribution channel is adopted in which the contents are filled and the opening is sealed or a spout is attached and the product is put on the market. That is, the means of delivering the liquid film to the sales maker with the liquid film formed on the inner surface of the pouch is not usually adopted. The work of forming a liquid film on the inner surface of an empty pouch is an extremely troublesome work, such as having to peel off the film that is stuck tightly and form a gap in which the liquid is filled in the pouch. Naturally, such troublesome work is required of the container manufacturer.

By the way, when creating a pouch having a liquid film formed on the inner surface, a liquid film is applied to one surface of the long film by means such as spray coating or roll coating in the process of winding the long film for the pouch with a roll. After that, such a long film is rolled out, cut appropriately, and the two films are joined by heat sealing so that the liquid film is on the inner surface. Therefore, there arises a problem that the liquid forming the liquid film adheres to the outer surface of the obtained empty pouch. This is because when a long film having a liquid film formed on one surface is wound by a roll, the long films overlap on the roll, so that the liquid film is set off on the other surface.

Patent No. 5971337

Therefore, an object of the present invention is to provide a pouch film molded body having a liquid forming a liquid film inside, but not adhering a liquid forming a liquid film on the outer surface side.

According to the present invention, it is a pouch film molded body for producing a pouch in which the contents are hermetically sealed, and the contents are discharged from the pouch and used.
It has a structure in which long films are laminated so as to face each other, and the gaps formed between the film surfaces are liquids that exhibit lubricity to the contents to be contained in the gaps. Is provided, and a film molded body for a pouch is provided, which is wound around a roll and held in this state.
In the present invention, the fact that the void is filled with the liquid means that the air layer is not formed in the liquid in the void.

In the film molded product of the present invention,
(1) A large number of the voids are arranged in the longitudinal direction of the long film, and each of the voids is formed by a three-way seal or a two-way seal.
(2) The inner surface of the long film forming the void is a rough surface in which fine protrusions are distributed.
(3) The liquid is filled in an amount of 0.1 to 100 g / m ² per internal surface area of the long film forming the voids.
Is preferable.

The pouch film molded body of the present invention is remarkable in that the voids formed by the film surfaces facing each other are filled with a liquid exhibiting lubricity to the contents (lubricating liquid film forming liquid). It has characteristics.
In the pouch film molded body having such a structure, for example, two long films arranged so as to face each other are partially heat-sealed, and in this state, the liquid is sprayed to two lengths. It can be produced by filling the voids formed by the shaku film. When the film molded body for the pouch of the present invention was prepared using the long film in this way, the molded bodies were obtained by arranging a large number of the molded bodies along the longitudinal direction of the long film, and as a result, this was rolled into a roll. When wound up, the problem of liquid set-off is completely prevented. That is, the liquid does not come into contact with the outer surface of the long film when it is wound on the roll.

Therefore, the film molded product for a pouch of the present invention can be delivered to a container content sales maker in a state where the outer surface is not contaminated with a liquid, and is extremely useful industrially.
Moreover, in the pouch film molded product of the present invention, since the liquid is interposed between the films facing each other, the inconvenience that these films stick to each other is effectively prevented, and the filling work of the contents is performed. It also has the advantage that it can be easily performed.

Schematic diagram showing a side cross section of the film molded article for a pouch of the present invention The figure for demonstrating the usage form of the film compact of FIG. Partially enlarged view of the film molded product of FIG. The figure which shows the arrangement pattern of the film molded article for pouch of this invention.

With reference to FIG. 1, which shows the most suitable correspondence of the pouch film molded product of the present invention, the pouch film molded product shown by 10 as a whole is composed of films 1 and 3 arranged so as to face each other. These films 1 and 3 are attached by heat sealing at their ends. That is, the bonded portion is the sealing surface 5. Further, the liquid 7 is filled in the voids formed in the unbonded free facing portions.

As shown in FIG. 2, such a film molded body 10 opens the tip portions 1a and 3a of the films 1 and 3 at the portion filled with the liquid 7, and contains the contents in the formed space 11. The opening 9 (film end portions 1a, 3a) is closed by a heat seal, or a spout is attached to this portion for sale. In the pouch thus obtained, as can be understood from FIG. 2, a thin liquid film 13 made of the liquid 7 is formed on the inner surface thereof, and the contents (not shown) filled in the pouch are liquids. It is held so as to be in contact with the film 13. That is, since the liquid film 13 is formed by the liquid 7 that exhibits lubricity to the contents filled in the pouch, the contents can be quickly discharged.

In the film molded body 10 described above, the films 1 and 3 may have a single-layer structure as long as the inner surface thereof is formed of a thermoplastic resin having a heat-sealing property, or another resin, an aluminum foil, or the like. It may have a multi-layer structure including the metal foil of.

Examples of the thermoplastic resin include low-density polyethylene, high-density polyethylene, polypropylene, poly1-butene, poly4-methyl-1-pentene, ethylene, propylene, 1-butene, 4-methyl-1-pentene and the like. Olefin resins such as random or block copolymers of α-olefins and cyclic olefin copolymers; ethylene such as ethylene / vinyl acetate copolymers, ethylene / vinyl alcohol copolymers, and ethylene / vinyl chloride copolymers. -Vinyl copolymer; styrene resin such as polystyrene, acrylonitrile / styrene copolymer, ABS, α-methylstyrene / styrene copolymer; polyvinyl chloride, polyvinylidene chloride, vinyl chloride / vinylidene chloride copolymer, Vinyl-based resins such as methyl polyacrylate and polymethyl methacrylate; polyamide resins such as nylon 6, nylon 6-6, nylon 6-10, nylon 11, and nylon 12; polyethylene terephthalate (PET), polybutylene terephthalate, and polyethylene na. Polyester resins such as phthalate and copolymerized polyesters thereof; polycarbonate resins; polyphenylene oxide resins; biodegradable resins such as polylactic acid; and the like can be used. Of course, a blend of these thermoplastic resins can also be used.
In the present invention, the most suitable resin is an olefin resin, particularly polyethylene or polypropylene, from the viewpoint of having a relatively high affinity with the liquid forming the liquid film 13 and having good flexibility as a bag.

When the films 1 and 3 have a multilayer structure, the innermost layer and the outermost layer are formed by the above-mentioned thermosetting thermoplastic resin, and a metal foil such as an aluminum foil or an ethylene vinyl alcohol copolymer is used as an intermediate layer. The gas barrier layer is preferably formed by using a gas barrier resin such as (ethylene vinyl acetate copolymer saponified product) or aromatic polyamide, and is most preferably formed by using an ethylene vinyl alcohol copolymer. Suitable. That is, by using a gas barrier resin as the resin for forming the intermediate layer, oxygen barrier properties can be imparted to the intermediate layer, and in particular, ethylene vinyl alcohol copolymer exhibits particularly excellent oxygen barrier properties, and therefore oxygen. Oxidative deterioration of the contents due to permeation can also be effectively suppressed, and excellent storage stability of the contents can be ensured.

Further, when the gas barrier resin as described above is used as the intermediate layer, it is preferable to provide the intermediate layer via the adhesive resin layer in order to enhance the adhesiveness with the inner and outer layers and prevent delamination. As a result, the intermediate layer can be firmly adhered and fixed to the inner and outer layers. The adhesive resin used for forming such an adhesive resin layer is known by itself, and for example, a resin having a carbonyl group (> C = O) in the main chain or side chain of 1 to 100 meq / 100 g, particularly 10 to 100 meq / 100 g. A resin contained in the amount of the resin, specifically, an olefin resin graft-modified with a carboxylic acid such as maleic acid, itaconic acid, fumaric acid or an anhydride thereof, an amide, an ester, or the like; an ethylene-acrylic acid copolymer; Ion-crosslinked olefin-based copolymers; ethylene-vinyl acetate copolymers; and the like are used as adhesive resins.

Further, the various resins used for forming the above-mentioned single-layer structure or multi-layer structure may contain various additives known per se. The multilayer structure can be obtained by a usual method such as dry lamination, coating, and melt coextrusion.
Further, the thickness of the films 1 and 3 having a single-layer structure or the thickness of each layer in the multi-layer structure exhibits the characteristics required for each layer as long as the characteristics such as the flexibility of the finally formed pouch are not impaired. It suffices if it is set to such a thickness.

The sealing surface 5 in FIG. 1 may not be formed. That is, the films 1 and 3 are generally formed by a film formed by a usual method such as a casting method, a T-die method, a calendar method or an inflation method. Therefore, when the films 1 and 3 are molded by a method other than the inflation method, it is necessary to bond the films 1 and 3 by heat sealing, and as a result, the sealing surface 5 is formed. However, the film formed by the inflation method has a tubular shape, and the films 1 and 3 are obtained in an integrated form. Therefore, when the film is molded by the inflation method, the sealing surface 5 is not formed, and heat sealing is performed after filling the inside with the contents.

Further, the liquid 7 must naturally be a non-volatile liquid having a small vapor pressure under atmospheric pressure, for example, a high boiling point liquid having a boiling point of 200 ° C. or higher. This is because when a volatile liquid is used, it easily volatilizes and disappears with time, making it difficult to form the liquid film 13.

Specific examples of such a liquid include various liquids provided that the liquid has a high boiling point as described above, and in particular, the content (slipperiness) in which the surface tension is filled in the pouch The material that is significantly different from the target substance) has a higher lubricating effect and is suitable for the present invention. For example, in order to increase the slipperiness of water or a hydrophilic substance including water, it is preferable to use a liquid having a surface tension in the range of 16 to 40 mN / m, particularly 16 to 35 mN / m, and a fluorine-based surfactant. Typical examples are silicone oils, fatty acid triglycerides, and various vegetable oils. Suitable vegetable oils include soybean oil, rapeseed oil, olive oil, rice oil, corn oil, beni flower oil, sesame oil, palm oil, castor oil, avocado oil, coconut oil, almond oil, walnut oil, shaving oil, and salad oil. Can be used for.

As is clear from FIG. 1, the pouch film molded product 10 of the present invention, which is formed of the above-mentioned various materials, has a form before the contents are filled in the pouch, and has transportability. From the viewpoint of the above, it has a flat shape. Therefore, no air layer is formed inside the liquid 7 held between the films 1 and 3, and the gap between the films 1 and 3 is filled with the liquid 7.

The amount of the liquid 7 is such that a liquid film 13 having a thickness sufficient to exhibit slipperiness is formed in a state where the contents are filled between the films 1 and 3 finally formed. 3 between it is sufficient to fill, for example, per inner surface area of the film 1, 3, 0.1 to 100 g / ^{m 2,} present in the film forming member 10 in particular an amount of 0.5 to 50 g / ^{m 2} Is preferable. If this amount is small, when the openings 9 (film ends 1a, 3a) of the molded body 10 are opened and the contents are filled, the thickness of the liquid film 13 varies widely, and slipperiness can be exhibited. It tends to be difficult to secure the liquid film thickness. Further, when the liquid 7 is filled with an excessive amount, the slipperiness is not further improved, the cost required for the liquid 7 becomes high, or the amount of the contents contained in the pouch is small. There is a risk of becoming.

In the pouch film molded body 10 of the present invention described above, the gaps between the films 1 and 3 are filled with the liquid 7, and when transported in this form, the outer surface of the molded body 10 is not contaminated with the liquid 7. However, in order to maximize this advantage, as shown in the partially enlarged view of FIG. 3, the inner surfaces 1b and 3b of the films 1 and 3 are coarse with fine protrusions distributed. It may be a surface. For example, its surface roughness is adjusted to a predetermined Ra (JIS-B-0601-1994) range. That is, since the inner surfaces 1b and 3b of the films 1 and 3 are rough surfaces, the filled liquid 7 is stably held in the molded body 10, and the outer surface is contaminated due to the liquid 7 falling off. This is because it is effectively prevented. Further, when such a rough surface is formed, a minute gap 15 (air layer) is formed between the inner surfaces 1b and 3b and the liquid 7, thereby forming an opening when filling the contents. The peeling at 9 (film end portions 1a and 3a) can be performed more easily, and the filling operation of the contents can be efficiently performed.

The roughening of the inner surfaces 1b and 3b of the films 1 and 3 as described above can be performed by a known method as described in Patent Document 1.
For example, mechanical means such as mold, roll transfer, embossing, spraying, optical means such as etching using photolithography and laser light, fine particles (metal oxide fine particles and polymer fine particles) and porous bodies are applied. Or mixed (kneaded) or blended in a solution for coating or dipping, coating or mixing (kneading) or blending a crystalline additive in a solution for coating or dipping, laminating a porous sheet (for example, non-woven fabric), resin The surface can be roughened by a method using the crystallization of the above.
Generally, if fine particles such as metal oxide fine particles and polymer fine particles are mixed (internally added) in a certain amount with the resin forming the inner surfaces 1b and 3b, the inner diameter corresponding to the particle size of the powder is added. Recesses or protrusions (recesses between the protrusions) are formed on the surface of the film. Further, if a crystalline additive is blended with the resin for forming the inner surface, the additive crystallizes and precipitates on the surface of the formed film at the time of cooling, thereby having the above-mentioned surface roughness Ra. A rough surface can be formed.

As the above oxide fine particles, for example, titanium oxide, alumina, silica and the like are used, and as the polymer fine particles, a cured product of polymethyl (meth) acrylate or the like is typical, and these are usually formed on the inner surface 1b of the film. The resin forming 3b (for example, an olefin resin such as polyethylene or polypropylene) is blended in an amount of about 0.2 to 5 parts by weight per 100 parts by weight.
Examples of the crystalline additive include various waxes such as candelilla wax, carnauba wax, beeswax, microcrystalline wax, and paraffin wax. Such a crystalline additive is blended in an amount of about 0.2 to 10 parts by weight per 100 parts by weight of the resin forming the inner surface of the container.

The pouch film molded body 10 of the present invention described above uses two films cut to a predetermined size, superimposes these films, and joins the peripheral portions thereof in a bag shape by heat sealing (bag making). , The film can be produced by filling a predetermined amount of liquid 7 from the opening 9 (film edges 1a, 3a) by spraying or the like, and the film obtained by inflation molding is described above. As described above, since it has a tubular shape, the liquid 7 forming the liquid film 13 is directly filled in the space inside the tube by spraying or the like without joining by heat sealing, and then this tubular shape ( It can also be manufactured by crushing a bag-shaped film.

However, in order to make the best use of the advantages of the pouch film molded body 10 of the present invention, a long film obtained by extrusion molding or the like is used, and two long films are laminated and rolled. When winding, it is preferable to heat-seal a predetermined portion to make a bag and fill the liquid 7. That is, since the film is wound in a state where the gap between the bags is filled with the liquid 7, the problem of set-off due to the liquid 7 is effectively prevented.
When the film molded body 10 for a pouch of the present invention is manufactured by bag-making using two long films in this way, the bag is first made by heat sealing and then by spraying or the like. The liquid 7 can be filled between the films and wound up by a roll, or the liquid 7 can be applied to the surface of one of the long films by a spray or a roll, and then a bag is made by heat sealing to roll the film. It can also be wound up by.

As described above, when the film molded body 10 for a pouch of the present invention is manufactured using two long films, the film molded body 10 is continuously obtained in a state where a large number of the film molded bodies 10 are arranged. An example of this arrangement pattern is shown in FIG.

In FIG. 4, the joint portion by heat sealing is shown by 5 as in FIG. 1, and the opening portion of the film molded body 10 is shown by 9.
In the example of FIG. 4A, the film molded bodies 10 made by the three-way seal are arranged in two rows and continuously connected in the longitudinal direction.
In the example of FIG. 4B, the film molded bodies 10 made by the three-way seal are continuously connected in a row in the longitudinal direction.
In the example of FIG. 4C, the film molded bodies 10 made by the two-way seal are continuously connected in a row in the longitudinal direction.

As described above, a large number of film molded bodies 10 obtained by being wound on a roll are delivered to the content sales maker as they are, where they are cut at appropriate positions of the heat seal portion 20 to form individual films. The body is divided into 10 parts, the openings 9 (film ends 1a, 3a) are opened to fill the contents, and a spout or other injection tool is attached (heat seal), and then the predetermined contents are filled. It is offered for sale as a pouch.
Further, the opening 9 can be directly heat-sealed and put on the market without attaching a spout or the like.
Further, as shown in FIG. 4C, the film molded body 10 obtained by making a bag with a two-way seal has openings 9 at both ends, and therefore, a dispenser is attached to one of the openings 9 (heat). After sealing), the contents are filled from the opening 9 on the opposite side, and then the opening 9 is closed by a heat seal.

In this way, when mounting the injection tool or filling the contents, it is necessary to expand the opening 9 (the portion where the films are not sealed to each other) by air blowing using an appropriate nozzle. As described above, in the film molded body 10, the films 1 and 3 do not directly face each other, and the liquid 7 is interposed between the films 1 and 3, so that this operation can be easily performed.

Since the pouch obtained from the pouch film molded body 10 of the present invention has a liquid film 13 formed of a liquid 7 showing lubricity to the contents on the inner surface, even if the contents are viscous, the contents The object can be discharged quickly and without remaining in the pouch. That is, by selecting an appropriate liquid 7 (lubricating oil), a viscous water-containing or oily paste or slurry-like substance such as ketchup, aqueous glue, honey, various sauces, mayonnaise, mustard , Jam, chocolate syrup, thickened nursing food, cosmetics such as milky lotion, liquid detergent, shampoo, rinse, etc. can be filled and sold.

1, 3: Film 1a, 3a: Film tip 1b, 3b: Film inner surface 5: Sealing surface 7: Liquid 13: Liquid film 15: Film inner surface 1b, 3b and liquid 7

Claims (4)

A film molded product for a pouch for producing a pouch in which the contents are hermetically sealed, and the contents are discharged from the pouch and used.
It has a structure in which long films are laminated so as to face each other, and the gaps formed between the film surfaces are liquids that exhibit lubricity to the contents to be contained in the gaps. A film molded body for a pouch, which is filled with and is wound and held by a roll in this state. The pouch film molded product according to claim 1, wherein a large number of the voids are arranged in the longitudinal direction of the long film, and each of the voids is formed by a three-way seal or a two-way seal. .. The film molded product for a pouch according to claim 1 or 2, wherein the inner surface of the long film forming the void is a rough surface in which fine protrusions are distributed. The film molded product for a pouch according to any one of claims 1 to 3, wherein the liquid is filled in an amount of 0.1 to 100 g / m ² per internal surface area of the long film forming the voids. ..

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