JP6971125B2 - Gazette bag, gusset bag with spout, gusset bag with contents and gusset bag with spout with contents - Google Patents

Description

The present invention relates to a gusset bag, a gusset bag with a spout, a gusset bag containing contents, and a gusset bag with a spout containing contents.

A gusset bag with a spout attached to a gusset bag having a pair of facing flat surfaces and a pair of facing side surfaces folded inside as a packaging container for filling liquid beverages such as juice and jelly-like foods. Is widely used.

As the packaging material forming the flat surface portion and the side surface portion of the gusset bag, for example, a polyester film, an aluminum foil, a stretched nylon film, a low-density polyethylene film, and a laminate in which these four layers are laminated in this order are known. (Patent Document 1). The polyester film imparts printability, dimensional stability, and heat resistance to the outer surface. The aluminum foil blocks oxygen, water vapor, and light from the outside of the bag. Impact resistance is imparted by the stretched nylon film. Heat sealability is imparted by the low density polyethylene film. This laminated body is laminated by a dry laminating method in which an adhesive is applied between layers of a film or the like, dried and bonded.

As a dry laminating machine, a single dry laminating machine in which two films or the like are bonded at one time via one adhesive layer and a single dry laminating machine in which three films or the like are bonded at one time via two adhesive layers. A tandem dry laminating machine for bonding is known. When the laminate described in Patent Document 1 is manufactured using these dry laminating machines, the dry laminating process is required three times when the single laminating machine is used and twice when the tandem laminating machine is used, and the production efficiency is high. Is bad.

As a packaging material, a coextruded biaxially stretched film having a polyamide layer inside a polyester layer, a gas barrier layer, and a laminate in which a seal layer is laminated in this order are also known (Patent Document 2). This laminate is obtained by laminating a coextruded biaxially stretched film, a gas barrier layer, and a sealing layer via a two-layer adhesive layer by a dry laminating method. Therefore, the laminate described in Patent Document 2 can be bonded by dry laminating twice when a single dry laminating machine is used and once when a tandem laminating machine is used, and is stretched with a polyester film and aluminum foil. Compared with the laminate described in Patent Document 1 in which a nylon film and a low-density polyethylene film are bonded together via three adhesive layers, the number of dry laminating processes can be reduced and the production efficiency is high.

Japanese Unexamined Patent Publication No. 2000-103438 Japanese Unexamined Patent Publication No. 2010-42585

However, as a result of examination by the present inventor, the gusset bag in which the pair of flat surface portions and the pair of side surface portions are formed by the laminate described in Patent Document 2 is compared with the gusset bag using the laminate described in Patent Document 1. It was found that the impact resistance was inferior, and bag breakage was likely to occur when dropped or due to the load applied to the distribution stage. It was also found that when the gas barrier layer of the laminate described in Patent Document 2 is made of metal foil, the metal foil is liable to crack when the gusset bag is dropped or due to the load applied to the distribution stage. When the metal leaf is cracked, the gas barrier property of the gusset bag is greatly deteriorated, and there is a problem that the protection of the contents is insufficient. In addition, this has the same problem when a vapor-deposited film is used instead of the metal foil.

INDUSTRIAL APPLICABILITY The present invention has high production efficiency, excellent impact resistance, and a gusset bag, a gusset bag with a spout, a gusset bag with contents, and a gusset bag with a spout that are less likely to be damaged when dropped or due to a load applied to the distribution stage. The purpose is to provide.

The present invention has the following aspects.
[1] A gusset bag including a pair of facing flat surface portions and a pair of facing side surface portions folded inside.
A laminate (A) in which at least one of the pair of flat surfaces is a coextruded biaxially stretched film having a polyamide layer inside a polyester layer, a metal layer or a vapor-deposited film layer, and a sealant layer laminated in this order from the outside. ) Formed by
A gusset bag in which the pair of side surface portions is formed of a laminate (B) having an outer film layer, a metal layer or a vapor-deposited film layer, an intermediate film layer, and a sealant layer.
[2] The gusset bag according to [1], wherein both of the pair of flat surfaces are formed of the laminated body (A).
[3] The gusset bag according to [1] or [2], wherein the thickness of the polyester layer of the coextruded biaxially stretched film is 20 to 50% with respect to the total thickness of the coextruded biaxially stretched film. ..
[4] One of the pair of flat surface portions is formed by the laminated body (A), and the other of the pair of flat surface portions and the pair of side surface portions are formed by the single laminated body (B). The gusset bag according to [1] or [3].
[5] Any of [1] to [4], wherein the laminate (B) is a laminate in which an outer film layer, a metal layer or a vapor-deposited film layer, an intermediate film layer, and a sealant layer are laminated in this order from the outside. The gusset bag described in Crab.
[6] A gusset bag with a spout to which a spout is attached to the gusset bag according to any one of [1] to [5].
[7] A gusset bag containing contents in which the contents are stored in the gusset bag according to any one of [1] to [5].
[8] A gusset bag with a spout containing the contents in which the contents are stored in the gusset bag with a spout according to [6].

The gusset bag, the gusset bag with a spout, the gusset bag containing the contents, and the gusset bag with the spout containing the contents of the present invention have high production efficiency and excellent impact resistance, and are damaged when dropped or due to a load applied to the distribution stage. Hateful.

It is a front view which showed an example of the gusset bag with a spout of this invention. It is a perspective view which showed the state which the contents were filled in the gusset bag with a spout of FIG. FIG. 1 is a cross-sectional view taken along the line II of the gusset bag with a spout shown in FIG. It is sectional drawing which showed an example of the laminated body (A) which forms the flat surface part of a gusset bag. It is sectional drawing which showed an example of the laminated body (B) which forms the side surface part of a gusset bag. It is sectional drawing which showed the other example of the laminated body (B) which forms the side surface part of a gusset bag. It is sectional drawing which showed an example of the gusset bag of this invention.

The meanings of the following terms in the present specification are as follows.
With respect to the resin, "crystallinity" means that the amount of heat of fusion is observed in the differential scanning calorimetry based on JIS K 7121. Further, "amorphous" means that the heat of fusion is not observed in the differential scanning calorimetry based on JIS K 7121.
The “polyester layer / polyamide layer” means a laminated structure in which a polyester layer and a polyamide layer are laminated, and other laminated structures are also described in the same manner.

The gusset bag and the gusset bag with a bag of the present invention are gusset bags of the same form except for the presence or absence of a bag. Further, the gusset bag containing the contents and the gusset bag with the spout of the present invention are the same as the gusset bag and the gusset bag with the spout of the present invention, except that the contents are stored. Hereinafter, as an embodiment of the gusset bag and the gusset bag with a spout of the present invention, an example of the gusset bag with a spout provided with a spout will be described in detail.
It should be noted that the dimensions and the like of the figures exemplified in the following description are examples, and the present invention is not necessarily limited to them, and the present invention can be appropriately modified without changing the gist thereof. ..

As shown in FIG. 1, the gusset bag 1 with a spout of the present embodiment includes a gusset bag 10, a spout 12 liquidally attached to the gusset bag 10, and a cap 13 attached to the spout 12. ..
As shown in FIGS. 1 to 3, the gusset bag 10 is provided so as to connect the pair of flat surface portions 14, 14 facing each other and the side ends of the flat surface portions 14, 14, and face each other folded inside. It includes a pair of side surface portions 16, 16.

The pair of flat surface portions 14, 14 and the pair of side surface portions 16, 16 in the gusset bag 10 are four sides extending in the height direction by heat-sealing the side ends of the adjacent flat surface portions 14 and the side surface portions 16. The end seal portion 18 is formed. Further, an upper end seal portion 20 in which the flat surface portion 14 and the side surface portion 16 are heat-sealed is formed at the upper end of the gusset bag 10, and a lower end seal portion 22 in which the flat surface portion 14 and the side surface portion 16 are heat-sealed is formed at the lower end. Is formed. That is, the upper end opening and the lower end opening of the tubular body formed by the pair of flat surface portions 14, 14 and the pair of side surface portions 16, 16 by the four side end sealing portions 18 are the upper end sealing portion 20 and the lower end seal, respectively. The gusset bag 10 is formed by being closed by the portion 22. As a result, the gusset bag 1 with a spout can accommodate the contents in the gusset bag 10.

In the upper end seal portion 20, the pair of half-folded side surface portions 16 and 16 are sandwiched by the pair of flat surface portions 14 and 14, and the spout 12 is sandwiched by the pair of flat surface portions 14 and 14 to be liquid-tight. It is fixed.
In the lower end seal portion 22, a pair of half-folded side surface portions 16, 16 are sandwiched by a pair of flat surface portions 14, 14. In this example, the lower end side of the pair of flat surface portions 14 and 14 has a narrowed shape, and the front view shape of the lower end seal portion 22 is such that the central portion in the width direction is a straight line along the width direction and is in the width direction. Both sides have a curved shape that is an inclined straight line that spreads upward.

In the gusset bag 10, the pair of flat surface portions 14, 14 constitutes the front surface and the back surface of the gusset bag 1 with a spout, respectively.
The gusset bag 10 is formed by half-folding the pair of side surface portions 16, 16 toward the inner side of the gusset bag 10 at the folding lines 16a, 16a extending in the height direction toward the center in the width direction, respectively. It has horizontal gusset portions 24, 24 to be formed.

As shown in FIG. 4, at least one of the pair of flat surface portions 14, 14 is a coextruded biaxially stretched film (hereinafter, also referred to as “film (a)”) 30 having a polyamide layer 30b inside the polyester layer 30a. , The dry laminate adhesive layer (hereinafter, also referred to as “DL layer”) 36, the metal layer 32, the DL layer 38, and the sealant layer 34 are formed of the laminate (A) 26 laminated in this order from the outside. .. The laminated body (A) forming at least one of the pair of flat surface portions 14 and 14 may be a laminated body in which the vapor-deposited film layer is used instead of the metal layer 32 in the laminated body (A) 26.

In the present invention, only one of the pair of flat surface portions may be formed of the laminated body (A) and the other may be formed of a packaging material other than the laminated body (A), but the pair may be formed from the viewpoint of higher production efficiency. It is preferable that both of the plane portions of the above are formed of the laminated body (A). As the packaging material other than the laminated body (A) forming the other of the pair of flat surface portions, the laminated body (B) described later is preferable.

The film (a) 30 in the present invention is located on the outermost layer of the laminated body (A) 26, and has printability, dimensional stability, and impact resistance. The film (a) 30 is a coextruded biaxially stretched film having a laminated structure of a polyester layer 30a / a polyamide layer 30b from the outside. The film (a) 30 is a film obtained by biaxially stretching a coextruded film having a polyester layer and a polyamide layer. The polyester layer 30a imparts dimensional stability, aroma retention, and heat resistance. The polyamide layer 30b imparts bending resistance and impact resistance. In the laminated body (A) 26 forming the flat surface portion 14, the polyamide layer 30b of the film (a) 30 is arranged inside the polyester layer 30a.

The polyester contained in the polyester layer 30a of the film (a) 30 has a unit derived from a dicarboxylic acid and a diol, and is obtained by polycondensing them. The polyester contained in the polyester layer 30a may be a crystalline polyester or an amorphous polyester, but a crystalline polyester is preferable from the viewpoint of dimensional stability, aroma retention, and heat resistance. The polyester contained in the polyester layer 30a may be one kind or two or more kinds.

Examples of the dicarboxylic acid include o-phthalic acid, terephthalic acid, isophthalic acid, succinic acid, adipic acid, sebacic acid, azelaic acid, octylsuccinic acid, cyclohexanedicarboxylic acid, naphthalenedicarboxylic acid, fumaric acid, maleic acid, and itaconic acid. , Decamethylene carboxylic acids, and their anhydrides and lower alkyl esters.
As the dicarboxylic acid, a sulfone group-containing dicarboxylic acid may be used. Examples of the sulfonic acid group-containing dicarboxylic acid include 5-sulfoisophthalic acid, 2-sulfoisophthalic acid, 4-sulfoisophthalic acid, 3-sulfophthalic acid, 5-sulfoisophthalate dialkyl, 2-sulfoisophthalate dialkyl and 4-sulfo. Examples thereof include dialkyl isophthalate, dialkyl 3-sulfoisophthalate, and sodium and potassium salts thereof.

Examples of the diol include aliphatic diols, alicyclic diols, and sulfone group-containing diols.
Examples of the aliphatic diols include ethylene glycol, 1,3-propanediol, 1,4-butanediol, diethylene glycol, 1,5-pentanediol, 1,6-hexanediol, dipropylene glycol, and triethylene glycol. Tetraethylene glycol, 1,2-propanediol, 1,3-butanediol, 2,3-butanediol, neopentyl glycol (2,2-dimethylpropane-1,3-diol), 1,2-hexanediol, Examples thereof include 2,5-hexanediol, 2-methyl-2,4-pentanediol, 3-methyl-1,3-pentanediol, and 2-ethyl-1,3-hexanediol.
Examples of the alicyclic diols include 2,2-bis (4-hydroxycyclohexyl) propane, an alkylene oxide adduct of 2,2-bis (4-hydroxycyclohexyl) propane, and 1,4-cyclohexane. Examples include diols and 1,4-cyclohexanedimethanol.
Examples of the sulfone group-containing diol include 1,3-dihydroxybutanesulfonic acid and 1,4-dihydroxybutanesulfonic acid.

Crystalline polyesters include polyethylene terephthalate (PET), terephthalic acid (99-80 mol%) and isophthalic acid (99-80 mol%), which are polyesters obtained from terephthalic acid and ethylene glycol from the viewpoint of dimensional stability, fragrance retention and heat resistance. 1-20 mol%) and polyester obtained from ethylene glycol, obtained from a mixture of terephthalic acid (99.5-90 mol%) and 5-sodium sulfoisophthalic acid (0.5-10 mol%) and ethylene glycol. Polyester is preferable, and PET is particularly preferable.
The content of the crystalline polyester in the polyester layer 30a is preferably 50 to 100% by mass, more preferably 70 to 100% by mass, based on the total mass of the polyester layer 30a.

As the amorphous polyester, a polyester obtained from a mixture of terephthalic acid, ethylene glycol (20 to 80 mol% in diol) and cyclohexanedimethanol (80 to 20 mol% in diol), terephthalic acid (in dicarboxylic acid). Polyesters obtained from a mixture of 20 mol% or more and less than 80 mol%), isophthalic acid (20 mol% or more and less than 80 mol% in dicarboxylic acid) and ethylene glycol are preferred.

The polyester layer 30a is provided with an antiblocking agent, a nucleating agent, a water repellent agent, an antioxidant, a heat stabilizer, a lubricant, an antistatic agent, a coloring agent, and a pigment, if necessary, as long as the effects of the present invention are not impaired. , Additives such as dyes may be contained.

Examples of the polyamide contained in the polyamide layer 30b of the film (a) 30 include aliphatic polyamides and aromatic polyamides, and aliphatic polyamides are preferable from the viewpoint of bending resistance and impact resistance. The polyamide contained in the polyamide layer 30b may be one type or two or more types.

Examples of the aliphatic polyamide include aliphatic nylon and a copolymer. Specifically, for example, polycapramid (nylon-6), poly-ω-aminoheptanoic acid (nylon-7), poly-ω-aminononanoic acid (nylon-9), polyundecaneamide (nylon-11), polylauryl. Lactum (nylon-12), polyethylenediamine adipamide (nylon-2,6), polytetramethylene adipamide (nylon-4,6), polyhexamethylene adipamide (nylon-6,6), polyhexa Methylene sebacamide (nylon-6,10), polyhexamethylene dodecamide (nylon-6,12), polyoctamethylene adipamide (nylon-8,6), polydecamethylene adipamide (nylon-10, 8), caprolactam / lauryllactam copolymer (nylon-6 / 12), caprolactam / ω-aminononanoic acid copolymer (nylon-6 / 9), caprolactam / hexamethylenediammonide adipate copolymer (nylon-6 / 6,6), Lauryl lactam / hexamethylene diammonium adipate copolymer (nylon-12 / 6,6), ethylenediamine adipamide / hexamethylene diammonium adipate copolymer (nylon-2,6 / 6,6) , Caprolactam / Hexamethylenediammonium adipate / Hexamethylenediammonium sebacate copolymer (nylon-6,6 / 6,10), Ethyleneammonium adipate / Hexamethylenediammonium adipate / Hexamethylenediammonium sebacate copolymer (Nylon-6,6 / 6,10) Nylon-6 / 6,6 / 6,10) can be mentioned.

As the aliphatic polyamide, nylon-6, nylon-6,6 and nylon6 / 6,6 are preferable, nylon-6 and nylon6 / 6,6 are more preferable, and nylon-6 is particularly preferable. When two or more kinds of aliphatic polyamides are combined, a combination of nylon-6 and nylon 6/6, 6 (mass ratio of about 50:50 to 95: 5) is preferable.

The content of the aliphatic polyamide in the polyamide layer 30b is preferably 10% by mass or more, more preferably 20% by mass or more, based on the total mass of the polyamide layer 30b.

From the viewpoint of improving the curl resistance of the film (a) 30, the polyamide layer 30b preferably contains an aromatic polyamide in addition to the aliphatic polyamide. The aromatic polyamide may be a crystalline aromatic polyamide or an amorphous aromatic polyamide, but a crystalline aromatic polyamide is preferable. The crystalline aromatic polyamide is obtained by polycondensing an aromatic diamine and a dicarboxylic acid.

Examples of the aromatic diamine used for the aromatic polyamide include metaxylylenediamine and paraxylylenediamine. Examples of the dicarboxylic acid used for the aromatic polyamide include adipic acid, suberic acid, sebacic acid, cyclohexanedicarboxylic acid, terephthalic acid, and isophthalic acid.

Examples of the crystalline aromatic polyamide include polymethaxylene adipamide (MXD-nylon).
Examples of the amorphous aromatic polyamide include amorphous nylon obtained by polycondensation of an aliphatic diamine such as hexamethylenediamine and a dicarboxylic acid such as terephthalic acid and isophthalic acid or a derivative thereof, and hexamethylenediamine-. A terephthalic acid-hexamethylenediamine-isophthalic acid copolymer is preferable.
When combining an aliphatic polyamide and an aromatic polyamide, a combination of nylon-6 and MXD-nylon and a combination of nylon-6 and amorphous nylon are preferable.

When the polyamide layer 30b contains an aromatic polyamide, the content of the aromatic polyamide in the polyamide layer 30b can be appropriately set. The content of the aromatic polyamide in the polyamide layer 30b is 1% by mass or more and less than 50% by mass with respect to the total mass of the polyamide layer 30b in that the bending resistance and impact resistance of the film (a) 30 are not easily impaired. Is preferable. The content of the aromatic polyamide in the polyamide layer 30b is preferably 50 to 90% by mass, more preferably 60 to 80% by mass, based on the total mass of the polyamide layer 30b, in that excellent curl resistance can be easily obtained. preferable.

The polyamide layer 30b may be provided with a bending resistance improving agent such as polyolefins, polyester elastomers, polyamide elastomers, antiblocking agents, nucleating agents, water repellents, and oxidations, if necessary, as long as the effects of the present invention are not impaired. It may contain an inhibitor, a heat stabilizer, a lubricant, an antistatic agent and the like.

The film (a) used in the present invention is not limited to the film (a) 30. The polyester layer in the film (a) may be one layer or two or more layers. The polyamide layer in the film (a) may be one layer or two or more layers.

The film (a) 30 may have an adhesive layer between the polyester layer 30a and the polyamide layer 30b. As a result, the interlayer strength between the polyester layer 30a and the polyamide layer 30b is improved.
The material for forming the adhesive layer is not particularly limited, and examples thereof include an acid-modified resin graft-modified with an unsaturated carboxylic acid or a derivative thereof. Specific examples thereof include modified polyolefins and modified styrene-based elastomers. The modified polyolefin is obtained, for example, by heating and mixing an unsaturated carboxylic acid or a derivative thereof and a resin in the presence of a radical generator.

Examples of the unsaturated carboxylic acid or a derivative thereof include unsaturated carboxylic acids such as maleic acid and fumaric acid, acid anhydrides thereof, esters thereof or metal salts thereof (sodium salt, potassium salt, calcium salt, etc.) and the like. .. As the modified polyolefin, maleic anhydride-modified polyolefin is preferable.

Examples of the polyolefin include copolymers with copolymerizable monomers such as homopolymers of olefins, mutual copolymers, and other vinyl-based monomers. Specifically, for example, polyethylene such as low density polyethylene (LDPE) and linear low density polyethylene (LLDPE), polypropylene, polybutene, mutual copolymers thereof, ionomer resin, ethylene-acrylic acid copolymer, ethylene. -A vinyl acetate copolymer or the like can be mentioned.
Examples of the styrene-based elastomer include a hydrogenated product of a styrene-butadiene copolymer and a hydrogenated product of a styrene-isoprene copolymer. As the modified styrene-based elastomer, a hydrogenated styrene-butadiene copolymer modified with maleic anhydride is preferable.

The thickness of the film (a) is preferably 6 to 55 μm, more preferably 10 to 30 μm.
The thickness of the polyester layer is preferably 10 to 90%, more preferably 20 to 50%, based on the total thickness of the film (a). When the thickness of the polyester layer is 10% or more with respect to the total thickness of the film (a), the film (a) is excellent in heat resistance and dimensional stability. It has impact resistance when the laminated body (A) is formed, and even if an impact such as a drop or a load at the distribution stage is applied when the laminated body (A) is used for a flat surface to form a gusset bag. , The metal layer or the vapor-filmed film layer is less likely to crack or break. Further, if it is 20% or more, when the gusset bag is formed by using the laminated body (A) for the flat surface portion, it is possible to prevent the metal layer or the vapor-deposited film layer from cracking or breaking even if a strong impact is applied. Has excellent impact resistance.
The thickness of the polyamide layer is preferably 10 to 90%, more preferably 50 to 80%, based on the total thickness of the film (a).

When the adhesive layer is provided between the polyester layer and the polyamide layer of the film (a), the thickness of the adhesive layer is preferably 0.5 to 5 μm, more preferably 0.5 to 2.5 μm. When the thickness of the adhesive layer is at least the lower limit, it is easy to control the thickness of the adhesive layer. When the thickness of the adhesive layer is not more than the upper limit value, it is possible to suppress the production cost while imparting sufficient adhesive strength.

As the film (a), a commercially available product may be used. Examples of commercially available products of the film (a) include trade names "HBN" and "HBF" manufactured by Gunze Corporation.

The metal layer 32 forming the laminated body (A) is a layer having a barrier property that blocks oxygen, water vapor, and light from the outside. The metal layer 32 is preferably a metal foil. As the metal of the metal foil, aluminum and magnesium are preferable, and aluminum is more preferable.
When the metal layer 32 is a metal foil, the thickness is preferably 6 to 15 μm, more preferably 7 to 12 μm.

When a vapor-film film layer is used instead of the metal layer 32, the vapor-film film layer may be, for example, a uniaxial or biaxial stretched film such as polyester such as polyethylene terephthalate, polypropylene, polyamide, or ethylene vinyl alcohol copolymer, or a non-stretched film film. Examples thereof include a thin-film deposition film obtained by depositing particles of a metal such as aluminum or magnesium or an oxide such as silicon oxide or aluminum oxide on them as a thin-film deposition base material.
When a vapor-deposited film layer is used instead of the metal layer 32, particles may be vapor-deposited on the surface of the vapor-filmed substrate on the film (a) side, or particles may be deposited on the surface of the vapor-deposited substrate on the sealant layer side. ..

The sealant layer 34 forming the laminated body (A) is located in the innermost layer of the laminated body (A) 26 and is made of a material having a heat-sealing property.
Materials having heat-sealing properties for forming the sealant layer 34 include polyethylene such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, ionomer resin, and ethylene-. Examples thereof include an acrylic acid copolymer, an ethylene-methyl acrylate copolymer, an ethylene-methacrylic acid copolymer, polypropylene, and an ethylene-propylene copolymer. The sealant layer 34 can be formed by using one or more of these resins or a film using the resin. The sealant layer 34 may be a single layer or a multilayer.

The thickness of the sealant layer 34 is preferably 30 to 150 μm, more preferably 50 to 80 μm. When the thickness of the sealant layer 34 is at least the lower limit value, sufficient heat sealability can be easily obtained. When the thickness of the sealant layer 34 is not more than the upper limit value, the laminated body (A) 26 is unlikely to become thicker than necessary.

The laminated body (A) 26 is obtained, for example, by laminating the film (a) 30, the metal layer 32 and the sealant layer 34 by two dry laminating processes via the DL layers 36 and 38. Further, the laminated body (A) 26 can be obtained by one processing when a tandem dry laminating machine is used.
As the dry laminate adhesive forming the DL layers 36 and 38, those generally used depending on the intended use may be used. When the content is a liquid, a two-component reaction type polyurethane adhesive having a polyol component having a hydroxyl group at the polymer terminal as a main agent and a polyisocyanate component having a hydroxyl group at the polymer terminal as a curing agent is preferable.

As shown in FIG. 5, the pair of side surface portions 16 and 16 are laminated with an outer film layer 40 / DL layer 48 / metal layer 42 / DL layer 50 / intermediate film layer 44 / DL layer 52 / sealant layer 46 in order from the outside. It is formed of the laminated body (B) 28 having the structure. The laminated body (B) forming at least one of the pair of side surface portions 16 and 16 may be a laminated body in which a vapor-deposited film layer is used instead of the metal layer 42 in the laminated body (B) 28.

The outer film layer 40 is located on the outermost layer of the laminated body (B) 28. As the film forming the outer film layer 40, a film having excellent printability, piercing strength, tensile strength, impact resistance and the like is preferable.
Examples of the material of the film forming the outer film layer 40 include polyesters such as polyethylene terephthalate, polypropylene, polyamides, and ethylene vinyl alcohol copolymers. The film forming the outer film layer 40 may be a non-stretched film or a stretched film, but a uniaxially stretched film or a biaxially stretched film is preferable.

The outer film layer 40 is a vapor-deposited film obtained by depositing a metal such as aluminum or magnesium or an oxide such as silicon oxide or aluminum oxide on the film in order to impart a barrier property to oxygen or water vapor. A coat film or the like coated with a barrier coating agent such as polyvinylidene chloride may be used.
The outer film layer 40 may be a single body or a laminated body of the above-mentioned film.

As the outer film layer 40, a biaxially stretched polyethylene terephthalate film is preferable from the viewpoint of printability and heat resistance to heat sealing.
The thickness of the outer film layer 40 is preferably 9 to 25 μm, more preferably 10 to 20 μm.

As the metal layer 42, the same ones as those mentioned in the metal layer 32 of the laminated body (A) 26 can be mentioned, and the preferred embodiment is also the same. When a thin-film film layer is used instead of the metal layer 42, examples of the thin-film film used for the thin-film film layer are the same as those of the thin-film film described in the laminated body (A). When a vapor-deposited film layer is used instead of the metal layer 42, particles may be vapor-deposited on the surface of the vapor-deposited base material on the outer film layer side, or particles may be vapor-deposited on the surface of the vapor-deposited base material on the sealant layer side.

The intermediate film layer 44 is a layer that plays a role of improving impact resistance, pinhole resistance, and puncture resistance.
Examples of the material of the film forming the intermediate film layer 44 include polyamide, polyethylene, polypropylene, polyester and the like. The film forming the intermediate film layer 44 may be a non-stretched film or a stretched film, but a uniaxially stretched film or a biaxially stretched film is preferable.

The intermediate film layer 44 may be a simple substance or a laminated body of the above-mentioned film.
As the intermediate film layer 44, a film made of the above-mentioned material, a coextruded film of a polyamide and an ethylene-vinyl alcohol copolymer, a biaxially stretched film thereof, or the like can be preferably used.

As the sealant layer 46, the same ones as those mentioned in the sealant layer 34 of the laminated body (A) 26 can be mentioned, and the preferred embodiment is also the same.
As the DL layers 48, 50, 52, the same ones as those mentioned in the DL layers 36, 38 of the laminated body (A) 26 can be mentioned, and the preferred embodiment is also the same.

In the present invention, the laminate (B) may have an outer film layer, a metal layer or a vapor-deposited film layer, an intermediate film layer, and a sealant layer. Not limited. For example, the laminate (B) may be a laminate in which an outer film layer, an intermediate film layer, a metal layer or a vapor-deposited film layer, and a sealant layer are laminated in this order from the outside. Specifically, as shown in FIG. 6, a laminated body having a laminated structure of an outer film layer 40 / DL layer 48 / intermediate film layer 44 / DL layer 50 / metal layer 42 / DL layer 52 / sealant layer 46 from the outside. B) It may be 28A. The laminated body (B) may be a laminated body (B) in which a vapor-deposited film layer is used instead of the metal layer 42 in the laminated body (B) 28A.

In the laminated body (B) 28A, the sealant layer 46 is bonded to the metal layer 42 via the DL layer 52, whereas in the laminated body (B) 28, the sealant layer 46 is attached to the intermediate film layer 44 via the DL layer 52. It is pasted together. The adhesive strength between the sealant layer 46 and the intermediate film layer 44 via the DL layer 52 is higher than the adhesive strength between the sealant layer 46 and the metal layer 42 via the DL layer 52. If the adhesive strength between the sealant layer 46 and the layer above it is low, the sealant layer 46 is likely to come off when an impact such as a drop or a load at the distribution stage is applied. When the sealant layer 46 is peeled off, the contents are inserted into the interface between the sealant layer 46 and the layer above it, and the peeling is promoted, which may lead to bag breakage. Therefore, it is preferable that the adhesive strength between the sealant layer 46 and the layer above it is high, and the laminated body (B) forming the pair of side surface portions 16 and 16 is a laminated body (B) as compared with the laminated body (B) 28A. B) 28 is preferable. Here, the load at the distribution stage refers to the load applied to the gusset bag with a spout when a large number of boxes containing a large number of gusset bags with a spout are stacked in the distribution process such as storage and transportation.
The laminated body (B) 28, 28A is obtained, for example, by laminating the outer film layer 40, the metal layer 42, the intermediate film layer 44, and the sealant layer 46 by three dry laminating processes.

The laminate (B) 28, 28A is a tandem dry laminating machine because the outer film layer 40, the metal layer 42, the intermediate film layer 44, and the sealant layer 46 are bonded by three DL layers 48, 50, 52. Even if there is, two dry laminates are required. On the other hand, in the laminated body (A) 26, since the film (a) 30, the metal layer 32 and the sealant layer 34 are bonded by two DL layers 36 and 38, the laminated body (A) 26 is dried once if it is a tandem dry laminating machine. Can be manufactured by laminating. As described above, the laminated body (A) 26 has a smaller number of dry laminating processes than the laminated bodies (B) 28 and 28A, and the production efficiency is high.

The present inventor has examined in detail the impact resistance of a gusset bag having a mode such as a gusset bag 10 having a pair of flat surface portions 14, 14 and a pair of side surface portions 16, 16. As a result, when the pair of flat surface portions 14, 14 and the pair of side surface portions 16, 16 are all formed of the laminated body (A) 26, the portion a where the folded line 16a of the side surface portion 16 and the upper end seal portion 20 intersect when dropped (FIG. It was found that tearing and cracking of the metal layer 32 are likely to occur in 1) and in the portion b (FIG. 1) where the folded line 16a of the side surface portion 16 and the lower end sealing portion 22 intersect. It was also found that when a vapor-filmed film layer is used instead of the metal layer 32, cracks are likely to occur in the portion a and the portion b. Here, cracking of the thin-film film layer means that cracks occur in the layer of particles vapor-filmed on the vapor-filmed substrate, and when cracked, the barrier property is lowered, similar to cracking of the metal layer. The present inventor further studies, and if the pair of side surface portions 16, 16 is formed of the laminated body (B) 28 or the laminated body (B) 28A, at least one of the pair of flat surface portions 14, 14 is formed by the laminated body (A). ) 26, tears, metal layer 32, or vapor deposition at the portion a where the fold line 16a of the side surface portion 16 and the upper end seal portion 20 intersect, or the portion b where the fold line 16a of the side surface portion 16 and the lower end seal portion 22 intersect. It has been found that cracking of the film layer is suppressed.
As described above, in the gusset bag 10, one or both of the pair of flat surface portions 14, 14 is formed of the laminated body (A) 26, and the pair of side surface portions 16, 16 are formed of the laminated body (B) 28 or the laminated body (B). B) By forming with 28A, excellent impact resistance against drops and loads applied to the distribution stage is ensured, barrier properties are not deteriorated, the contents can be sufficiently protected, and high production efficiency is achieved. Is obtained.

In the gusset bag 1 with a spout, the upper end seal portion 20 of the gusset bag 10 is provided with a spout 12 for pouring out the contents contained in the gusset bag 10 or for drinking the contents. At the upper end of the spout 12, a cap 13 is provided which is screwed into the spout 12 to close the opening of the spout 12.

Of the spout 12, at least the portion to be sealed with the inner surface of the flat surface portion 14 of the gusset bag 10 is made of synthetic resin.
Examples of the synthetic resin include a polyolefin resin, a polyamide resin, a polyester resin, a (meth) acrylic resin, a vinyl chloride resin, a vinylidene chloride resin, a polyether sulfone, and an ethylene-vinyl alcohol copolymer. Of these, polyolefin resins are preferable because they are excellent in processability and low in cost.

Examples of the polyolefin resin include high-density polyethylene, medium-density polyethylene, high-pressure low-density polyethylene, linear low-density polyethylene, polyethylene-based resins such as ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, and the like. Examples thereof include polypropylene-based resins such as olefin-based elastomers, polypropylene, ethylene-propylene random copolymers, and α-olefin-propylene random copolymers, and cyclic polyolefin resins. These resins may be blended for the purpose of improving the performance, or may be partially crosslinked for the purpose of improving the heat resistance and the like.

The spout 12 may be formed of a single material, or may be formed of a multilayer structure composed of various resin layers.
Of the spout 12, the resin forming at least the portion to be sealed with the flat surface portion 14 of the gusset bag 10 is made of the same resin as the resin forming the innermost layer of the flat surface portion 14 from the viewpoint of sealing property. Is preferable.

The material of the cap 13 is not particularly limited, and examples thereof include the synthetic resin mentioned as the material of the spout 12.

The method for manufacturing the gusset bag 1 with a spout is not particularly limited, and the laminated body (A) 26 is used as the laminated body forming the pair of flat surface portions 14 and 14, and the laminated body forming the pair of side surface portions 16 and 16. A known method can be adopted except that the laminated body (B) 28 and the laminated body (B) 28A are used.

As described above, in the present invention, at least one of the pair of flat surface portions is formed of the laminated body (A), and the pair of side surface portions is formed of the laminated body (B), so that the product is dropped or distributed. It is possible to increase the production efficiency by reducing the number of times of dry laminating in the production of the laminated body while ensuring excellent impact resistance against a load.

The present invention is limited to the above-mentioned gusset bag 1 with a spout as long as at least one of the pair of flat surface portions is formed of the laminated body (A) and the pair of side surface portions is formed of the laminated body (B). Not done.

For example, the gusset bag and the gusset bag with a spout of the present invention may include the gusset bag 10A whose cross-sectional view corresponding to FIG. 3 is illustrated in FIG. 7 instead of the gusset bag 10. The same parts as those in FIG. 3 in FIG. 7 are designated by the same reference numerals, and the description thereof will be omitted.
In the gusset bag 10A, one flat surface portion 14 on the front side of the bag and a pair of side surface portions 16 are formed of one laminated body (B) 28, and the other flat surface portion 14 on the back surface side of the bag is formed. It is formed of one laminated body (A) 26. In the gusset bag 10A, the laminated body (A) forming the side ends on both sides of the one laminated body (B) 28 forming the one flat surface portion 14 and the pair of side surface portions 16 and 16 and the other flat surface portion 14. ) 26 is heat-sealed with the side ends on both sides to form two side end seal portions 18A. The one flat surface portion 14 and the pair of side surface portions 16 on the front surface side of the bag may be formed of one laminated body (B) 28A. Further, the front surface and the back surface may be reversed.

Similar to the gusset bag 10, the gusset bag 10A also has a pair of side surface portions 16 formed of the laminated body (B) 28 or the laminated body (B) 28A, so that it has excellent impact resistance against a load applied to a drop or a distribution stage. Since the other flat surface portion 14 is formed of the laminated body (A) 26 while ensuring the property, high production efficiency can be obtained.
Compared with the gusset bag 10A and the gusset bag 10, the gusset bag 10 has many surfaces formed of the laminated body (A), and is preferable in that higher production efficiency can be obtained. On the other hand, the gusset bag 10A has a portion where the side end seal portion 18A does not protrude outward like the side end seal portion 18 of the gusset bag 10, so that the side end seal portion gives less discomfort to the hand. Is preferable.

In the gusset bag and the gusset bag with a spout of the present invention, the whole or a part of the side end seal portion in the width direction may be folded back to the flat surface portion side or the side surface portion side, and the side end seal portion may be folded back to the flat surface portion side or the side surface portion side. It may be adhesively fixed to the flat surface portion or the side surface portion in a closed state. As a result, the discomfort given to the hand by the side end sealing portion when held by hand is reduced. The surface of the outermost layer of the flat surface portion or the side surface portion to be adhesively fixed preferably has a heat-sealing property.

Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to the following description.
[material]
The materials used in this example are shown below.
Film (a-1): coextruded biaxially stretched film, thickness 15 μm.
Thickness of polyester layer: 2 μm, thickness of polyamide layer: 13 μm
Film (a-2): coextruded biaxially stretched film, thickness 15 μm.
Thickness of polyester layer: 5 μm, thickness of polyamide layer: 10 μm
PET: Polyethylene terephthalate film, thickness 12 μm.
AL: Aluminum foil, thickness 7 μm.
ONY: Stretched nylon film, thickness 15 μm.
LLDPE: Linear low density polyethylene film, thickness 60 μm.
Dry Laminate Adhesive: A two-component curable polyurethane adhesive.

[Example 1]
By one-time dry laminating process using a tandem dry laminating machine, the film (a-1) which is a film (a), AL which is a metal layer, and LLDPE which is a sealant layer are bonded to each other, and the film (a-1) is attached. A laminated body (A-1) having a laminated structure of / DL layer / AL (7 μm) / DL layer / LLDPE (60 μm) was obtained.
Using a tandem dry laminating machine, PET, which is an outer film layer, AL, which is a metal layer, and ONY, which is an intermediate film layer, are bonded together by dry laminating using an adhesive for dry laminating, and PET / DL layer / AL. A laminated body having a laminated structure of / DL layer / ONY was obtained. Next, LLDPE, which is a sealant layer, is bonded to the ONY side of the laminate by a single dry laminating machine, and PET (12 μm) / DL layer / AL (7 μm) / DL layer / ONY (15 μm) / DL layer / LLDPE ( A laminated body (B-1) having a laminated structure of 60 μm) was obtained.
A laminated body (A-1) is used as a laminated body forming a pair of flat surface portions, and a laminated body (B-1) is used as a laminated body forming a pair of side surface portions, with spouts exemplified in FIGS. A gusset bag with a spout having the same shape as the gusset bag 1 was produced.

[Example 2]
A laminated body (A-2) was obtained in the same manner as in Example 1 except that the film (a-2) was used instead of the film (a-1).
A gusset bag with a spout was produced in the same manner as in Example 1 except that the laminated body forming the pair of flat surface portions was changed to the laminated body (A-2).

[ Reference example ]
Using a tandem dry laminating machine, PET, which is an outer film layer, ONY, which is an intermediate film layer, and AL, which is a metal layer, are bonded together by dry laminating using an adhesive for dry laminating, and PET / DL layer / ONY. A laminated body having a laminated structure of / DL layer / AL was obtained. Next, LLDPE, which is a sealant layer, was bonded to the AL side of the laminate by a single dry laminating machine, and PET (12 μm) / DL layer / ONY (15 μm) / DL layer / AL (7 μm) / DL layer / LLDPE ( A laminated body (B-2) having a laminated structure of 60 μm) was obtained.
The same as in Example 1 except that the laminated body forming the pair of flat surface portions was changed to the laminated body (A-2) and the laminated body forming the pair of side surface portions was changed to the laminated body (B-2). A gusset bag with a spout was prepared.

[Comparative Example 1]
A gusset bag with a spout was produced in the same manner as in Example 1 except that the laminated body forming the pair of side surface portions was changed to the laminated body (A-1).

[Comparative Example 2]
A gusset bag with a spout was produced in the same manner as in Example 1 except that the laminated body forming the pair of flat surface portions was changed to the laminated body (B-1).

[Comparative Example 3]
The same as in Example 1 except that the laminated body forming the pair of side surface portions was changed to the laminated body (A-1) and the laminated body forming the pair of flat surface portions was changed to the laminated body (B-1). A gusset bag with a spout was prepared.

[Drop test]
180 g of water was put into the inside of the gusset bag with a spout of each example, and the bag was dropped from a height of 150 cm with the bottom of the bag facing down, and then the presence or absence of cracks or breakage of the aluminum foil was visually confirmed. A similar test was performed on 10 gusset bags with spouts, and the number of bags in which the aluminum foil was cracked or broken was counted at the intersection of the fold line on the side surface, the upper end seal portion, and the lower end seal portion.

[Compression resistance test]
Put 180g of water inside the gusset bag with spout of each example, place it with the flat part of the bag facing down, apply a predetermined load from above for 1 minute, perform a compression resistance test to show the strength of the gusset bag, and perform an aluminum foil. The presence or absence of cracks and broken bags was visually confirmed. A similar test was performed on 10 gusset bags with spouts, and the number of bags in which the aluminum foil was cracked or broken was counted at the intersection of the fold line on the side surface, the upper end seal portion, and the lower end seal portion. Here, the compression resistance test is a test for confirming whether or not the gusset bag with a spout is resistant to the load because various loads are applied to the gusset bag with a spout in the distribution process such as storage and transportation. That is, it is a test in which a compressive load assumed by the load is applied to the gusset bag with a spout, and the presence or absence of breakage of the gusset bag with a spout such as leakage from the seal portion or cracking of the aluminum foil is confirmed.
The results are shown in Table 1. N / 10 in Table 1 indicates that the aluminum foil was cracked or broken in N out of 10 bags.

As shown in Table 1, the gusset bags with spouts of Examples 1 and 2 in which the pair of flat surface portions are formed of the laminated body (A) and the pair of side surface portions are formed of the laminated body (B) are once. Since the laminated body (A) can be obtained by the dry laminating process of the above, the production efficiency is high, the number of bags in which the aluminum foil is cracked or broken in the drop test and the compression resistance test is small, and the impact resistance is excellent. ..

On the other hand, the pair of plane portions and a pair of side surface portions of the laminate (A) the spout-attached gusset bag of Comparative Example 1 was formed, the production efficiency is high, the drop test and compression test, the aluminum foil cracks or broken The number of bags produced was large, and the impact resistance was inferior.
A pair of plane portions and a pair of side surface portions of the laminate (B) spout-attached gusset bag of Comparative Example 2 was formed in, it is necessary to dry lamination of at least twice in the manufacture of the laminate (B), the production efficiency It was low.
The gusset bag with a spout of Comparative Example 3 in which a pair of flat surface portions is formed of a laminated body (B) and a pair of side surface portions are formed of a laminated body (A) is made of aluminum foil in a drop test and a compression resistance test. The number of bags that were cracked or broken was large, and the impact resistance was inferior.

1 ... Gazette bag with spout, 10 ... Gazette bag, 12 ... Spout, 14 ... Flat part, 16 ... Side part, 18, 18A ... Side end seal part, 20 ... Upper end seal part, 22 ... Lower end seal part, 24 ... Horizontal Gazette portion, 26 ... Laminated body (A), 28, 28A ... Laminated body (B), 30 ... Film (a), 30a ... Polyester layer, 30b ... Polyester layer, 32, 42 ... Metal layer, 34 ... Sealant layer, 36, 38, 48, 50, 52 ... Dry laminate adhesive layer, 40 ... Outer film layer, 44 ... Intermediate film layer.

Claims (7)

A gusset bag having a pair of facing flat surfaces and a pair of facing side surfaces folded inward.
A laminate (A) in which at least one of the pair of flat surfaces is a coextruded biaxially stretched film having a polyamide layer inside a polyester layer, a metal layer or a vapor-deposited film layer, and a sealant layer laminated in this order from the outside. ) Formed by
The pair of side surface portions is formed of a laminate (B) having an outer film layer, a metal layer or a vapor-deposited film layer, an intermediate film layer, and a sealant layer .
A gusset bag in which the laminated body (B) is a laminated body in which an outer film layer, a metal layer or a vapor-deposited film layer, an intermediate film layer, and a sealant layer are laminated in this order from the outside. The gusset bag according to claim 1, wherein both of the pair of flat surfaces are formed of the laminated body (A). The gusset bag according to claim 1 or 2, wherein the thickness of the polyester layer of the coextruded biaxially stretched film is 20 to 50% with respect to the total thickness of the coextruded biaxially stretched film. Claim 1 in which one of the pair of flat surface portions is formed of the laminated body (A), and the other of the pair of flat surface portions and the pair of side surface portions are formed of the single laminated body (B). Or the gusset bag according to 3. A gusset bag with a spout to which a spout is attached to the gusset bag according to any one of claims 1 to 4. A gusset bag containing contents in which the contents are stored in the gusset bag according to any one of claims 1 to 4. A gusset bag with a spout containing the contents in which the contents are stored in the gusset bag with a spout according to claim 5.

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