WO2022230588A1 - Composite film, packaging bag, lid member, container with lid, and manufacturing method of composite film - Google Patents

Composite film, packaging bag, lid member, container with lid, and manufacturing method of composite film Download PDF

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Publication number
WO2022230588A1
WO2022230588A1 PCT/JP2022/016174 JP2022016174W WO2022230588A1 WO 2022230588 A1 WO2022230588 A1 WO 2022230588A1 JP 2022016174 W JP2022016174 W JP 2022016174W WO 2022230588 A1 WO2022230588 A1 WO 2022230588A1
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WIPO (PCT)
Prior art keywords
layer
composite film
heat
adhesive resin
heat seal
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PCT/JP2022/016174
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French (fr)
Japanese (ja)
Inventor
誠悟 ▲吉▼村
直明 柴田
栞 小野
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共同印刷株式会社
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Priority claimed from JP2021209875A external-priority patent/JP2022170658A/en
Application filed by 共同印刷株式会社 filed Critical 共同印刷株式会社
Publication of WO2022230588A1 publication Critical patent/WO2022230588A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/26—Layered products comprising a layer of synthetic resin characterised by the use of special additives using curing agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package

Definitions

  • the present invention relates to a composite film, a packaging bag, a lid material, a lidded container, and a method for manufacturing a composite film.
  • Patent Literature 1 discloses a sheet material for packaging food for microwave cooking in which a base film and a sealant film are laminated, and the sealant films have different melting points and are thermally adhesive to each other.
  • a laminated body of layers made of a thermoplastic resin having By forming a laminated body of layers made of a thermoplastic resin having, the heat-sealed part where the sealant film of the packaging sheet material is heat-sealed is partially destroyed by heating during microwave cooking, forming a vent hole. It is proposed to
  • microwave pouches are known that allow steam to be vented from an intended position.
  • Patent Document 2 proposes, as a pouch packaging material, a laminate in which a base material layer, a thermosoftening layer, and a heat seal layer are laminated in this order. Then, by half-cutting from the heat-seal layer side of the laminate, steam can pass through the half-cut at the heat-sealed portion where the heat-seal layers are heat-sealed to each other when cooked in a microwave oven. is proposed.
  • the packaging material described in Patent Document 2 has an adhesive layer in addition to the thermosoftening resin layer between the base material layer and the heat seal layer.
  • the thermosoftening resin layer is arranged only in the half-cut region, and the thermosoftening resin layer is scattered in the adhesive layer arranged on the entire surface. It was in a state where it was embedded as
  • the packaging material described in Patent Document 2 has the problem that not only the manufacturing process of the laminate becomes complicated, but also the cost increases.
  • a composite film that can achieve the same steam release performance can specify the steam release location when heating with a microwave oven, etc. by providing half cuts at necessary locations, and further suppresses the occurrence of lamination floating.
  • the present inventors have made intensive studies to solve the above problems. Then, the present inventors have found that the above problems can be solved by applying an adhesive composition having a specific configuration as a heat-softening resin layer of a composite film that serves as a packaging material, and have completed the present invention. That is, the present invention is as follows.
  • thermosoftening adhesive resin layer is composed of a thermosoftening adhesive resin having a crosslinked structure, composite film.
  • thermosoftening adhesive resin layer is composed of a thermosoftening adhesive resin having a crosslinked structure, composite film.
  • thermosoftening adhesive resin layer is composed of a thermosoftening adhesive resin having a crosslinked structure, composite film.
  • the heat-softening adhesive resin is formed from an adhesive composition containing less than 0.2 parts by weight of a curing agent per 1 part by weight of a main agent.
  • thermosoftening adhesive resin is formed from an adhesive composition containing more than 0.125 parts by mass and less than 0.2 parts by mass of a curing agent with respect to 1 part by mass of a main agent.
  • a lid material formed from the composite film according to aspect 7 for sealing an upper end opening of a container body comprising: The sealing is such that the heat seal layer is heat-sealed to the container body so that the upper end opening is covered with the lid material to form an unsealable joint, The lid member, wherein the half-cuts are arranged so as to traverse from the inside to the outside of the container body at the joint.
  • the lid material according to aspect 10 which is for a microwave oven.
  • An openable lidded container comprising The upper end opening of the container body has a flange, the heat-seal layer is heat-sealed to the flange to form an openable joint; The half-cut traverses the joint from the inside to the outside of the container body, A container with an openable lid.
  • a method for producing a composite film according to aspect 7, comprising: A half-cut production step of cutting the sheet including the heat seal layer with a rotary die cutter so as to penetrate in the thickness direction of the heat seal layer; A lamination step of laminating the base material layer and/or the thermosoftening adhesive resin layer on the sheet containing the heat seal layer after the half-cut production step, A method for manufacturing a composite film.
  • the composite film of the present invention even if only one layer of a resin layer having heat softening property is arranged between the base material layer and the heat seal layer, it has the same vapor release performance as the conventional one. , packaging bags such as pouches, openable containers, and the like can be produced.
  • thermosoftening adhesive resin layer when an adhesive layer other than the thermosoftening adhesive resin layer is not arranged between the base material layer and the heat seal layer, the manufacturing process of the composite film can be simplified. It can contribute to production capacity and production costs.
  • the composite film of the present invention is a composite film that suppresses the occurrence of lamination during storage and the resulting appearance defects. storability can be improved.
  • FIG. 1 is a cross-sectional view of a composite film according to one embodiment of the invention.
  • FIG. It is a figure which shows the packaging bag which concerns on one Embodiment of this invention.
  • FIG. 4 is a schematic view of the packaging bag according to one embodiment of the present invention when steam is vented.
  • the composite film of the present invention is a composite film in which at least a substrate layer, a heat-softening adhesive resin layer, and a heat-sealing layer are laminated in this order, and the heat-softening adhesive resin layer has a crosslinked structure. is composed of a heat-softening adhesive resin having composite film.
  • FIG. 1 shows a cross-sectional view of one embodiment of the composite film of the present invention.
  • the composite film of the present invention includes a substrate layer, a thermosoftening adhesive resin layer, and a heat seal layer as essential components, which are laminated in this order.
  • any layer may be provided in addition to the base material layer, the thermosoftening adhesive resin layer, and the heat seal layer.
  • the optional layer include a barrier layer for imparting barrier properties. , a reinforcing layer for reinforcing strength, or an adhesive layer for bonding between layers.
  • the composite film 10 shown in FIG. 1 is a mode comprising only the base material layer 1, the heat-softening adhesive resin layer 2, and the heat seal layer 3, which are essential components in the present invention. 1. Layers other than these may exist between the thermosoftening adhesive resin layer 2 and the heat seal layer 3 or outside the laminate containing these layers.
  • each layer constituting the composite film of the present invention can be appropriately determined according to the use of the composite film.
  • the substrate layer is an essential constituent layer in the composite film of the present invention.
  • the substrate layer, the thermosoftening adhesive resin layer, and the heat seal layer are laminated in this order, so the substrate layer forms a structure such as a packaging bag or package. becomes the outer layer of the structure. Therefore, the base layer can serve as a protective layer when the heat-seal layer, which is the innermost layer, is heat-sealed to form a structure. In addition, it can also be a printing layer for printing for displaying contents and the like.
  • the material constituting the base material layer is not particularly limited as long as it is a resin or the like, especially a resin or the like that can be used as a protective layer and can be printed.
  • resins can be used, for example, polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyethylene (PE), polypropylene (PP) , polyolefins such as polystyrene (PS), polyamides (PA) such as nylon-6 and nylon-66, and polycarbonates (PC).
  • the resin or the like constituting the base material layer may be blended not only in one kind but also in a blend of two or more kinds, and if necessary, an additive or the like for imparting functionality etc. may be blended. .
  • the base material layer is preferably made from a preformed film.
  • the film that serves as the substrate layer may be a film formed from the above-mentioned resin or the like, and may be unstretched or uniaxially or biaxially stretched. Among them, a biaxially stretched film is preferred.
  • oxides such as silicon oxide and aluminum oxide may be vapor-deposited on the film that serves as the base layer.
  • the film that serves as the base layer may be a single layer or a laminate consisting of multiple layers.
  • thermosoftening adhesive resin layer is an essential constituent layer in the composite film of the present invention.
  • the thermosoftening adhesive resin layer is arranged between the substrate layer and the heat seal layer.
  • thermosoftening adhesive resin constituting the thermosoftening adhesive resin layer of the present invention has a crosslinked structure.
  • the material for forming the heat-softening adhesive resin is not particularly limited as long as it can form a crosslinked structure, is softened by heat, and can form an adhesive resin layer. good. composite film.
  • thermosoftening adhesive composition which is the material forming the thermosoftening adhesive resin, may be, for example, an adhesive composition containing a main agent and a curing agent.
  • the main agent constituting the adhesive composition which is the material for forming the thermosoftening adhesive resin, is not particularly limited, but from the viewpoint of facilitating dry lamination to the substrate layer, it is liquid at room temperature. Some are preferred. Examples include polyols, and examples of polyols include polycarbonate polyols, polycaprolactone polyols, polyester polyols, polyether polyols, polyolefin polyols, acrylic polyols, silicone polyols, castor oil-based polyols, fluorine-based polyols, and the like.
  • the main agent may be used singly or in combination of two or more.
  • polyester polyols or polyether polyols are preferably used, and more preferably at least one polyol selected from the group consisting of polyester polyurethane polyols and polyether polyurethane polyols from the viewpoint of rapid curing.
  • a polyether polyol capable of forming an ether-based resin layer is particularly suitable, and the polyether polyol may be a polyether polyurethane polyol.
  • the curing agent constituting the adhesive composition which is the material for forming the thermosoftening adhesive resin, is not particularly limited, but from the viewpoint of facilitating dry lamination to the substrate layer, it is liquid at room temperature. is preferred.
  • Curing agents include, for example, polyisocyanates.
  • polyisocyanates examples include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, and 1,3-butylene diisocyanate.
  • Aromatic or araliphatic organic compounds such as araliphatic diisocyanates, triphenylmethane-4,4′4′′-triisocyanate, 1,3,5-triisocyanatobenzene, and 2,4,6-triisocyanatotoluene.
  • Polyisocyanate monomers such as organic tetraisocyanates typified by triisocyanates and araliphatic tetraisocyanates such as 4,4'-diphenyldimethylmethane-2,2'-5,5'-tetraisocyanate and the like can be mentioned.
  • polyisocyanates these monomers and other compounds Derivatives and adducts obtained by reaction, or derivatives such as dimers and trimers derived from these monomers may be used.
  • composition ratio of main agent and curing agent is, for example, less than 0.2 parts by mass of the curing agent per 1 part by mass of the main agent. you can
  • the gap between the base material layer and the heat seal layer is 70%.
  • a thermosoftening adhesive resin layer having high lamination strength at °C is formed. As a result, the resulting composite film has reduced vapor release performance.
  • the composition ratio of the main agent and the curing agent contained in the adhesive composition is less than 0.01 mass of the curing agent per 1 part by mass of the main compound, the substrate layer and the heat seal layer are separated. A thermosoftening adhesive resin layer having low bonding strength is formed. As a result, the resulting composite film has a weak lamination strength at room temperature, and lamination may occur.
  • composition ratio of the main agent and the curing agent contained in the adhesive composition which is the material for forming the heat-softening adhesive resin, is 0.15 parts by mass or less of the curing agent per 1 part by mass of the main agent, and 0.125 parts by mass. It may be 0.10 parts by mass or less, 0.075 parts by mass or less, or 0.05 parts by mass or less.
  • the composition ratio of the main agent and the curing agent contained in the adhesive composition is 0.01 parts by mass or more, 0.025 parts by mass or more, 0.05 parts by mass or more of the curing agent per 1 part by mass of the main agent. It may be 0.075 parts by mass or more, 0.10 parts by mass or more, 0.125 parts by mass or more, or 0.15 parts by mass or more.
  • the composition ratio of the main agent and the curing agent contained in the adhesive composition which is the material for forming the heat-softening adhesive resin, is 0.125 parts by mass of the curing agent per 1 part by mass of the main agent.
  • the amount is more than 0.2 parts by mass and less than 0.2 parts by mass, the composite film of the present invention is applied from the heat seal layer side and has a half cut reaching the heat softening adhesive resin layer. In the processing step of (1), leakage of the adhesive composition from the half-cut can be suppressed.
  • the adhesive composition which is the material for forming the thermosoftening adhesive resin, may optionally contain components other than the main agent and the curing agent.
  • Other components include, for example, solvents, components for imparting functionality to the resulting thermosoftening adhesive resin layer, additives, and the like.
  • the composite film of the present invention has a laminate strength of 1.3 N/15 mm or more between the substrate layer and the heat seal layer at 25°C, and a laminate strength at 70°C between the substrate layer and the heat seal layer. is less than 0.6 N/15 mm.
  • the "laminate strength" can be measured by performing T-shaped peeling under the condition of 300 mm/min and calculating the section average of the displacement of 20 to 50 mm.
  • the structure formed from the composite film of the present invention has sufficient strength around room temperature. Also, during storage and handling, peeling (lamination) does not occur between the base material layer and the heat seal layer.
  • the laminate strength at 25° C. between the base material layer and the heat seal layer is 1.5 N/15 mm or more, 1.8 N/15 mm or more, 2.0 N/15 mm or more, 2.4 N/15 mm or more, 2.8 N/ It may be 15 mm or more, or 3.0 N/15 mm or more.
  • the laminate strength at 25° C. between the base material layer and the heat seal layer is 6.0 N/15 mm or less, 5.0 N/15 mm or less, 4.5 N/15 mm or less, 4.0 N/15 mm or less, 3 .5 N/15 mm or less, or 3.0 N/15 mm or less.
  • the laminate strength at 70°C between the base material layer and the heat seal layer is less than 0.6 N/15 mm, when the structure formed from the composite film of the present invention is heated, Spaces are easily formed in the softening adhesive resin layer, and steam can be transferred through the spaces, thereby exhibiting the same steam release performance as conventional ones.
  • the laminate strength at 70° C. between the base material layer and the heat seal layer is 0.5 N/15 mm or less, 0.4 N/15 mm or less, 0.3 N/15 mm or less, 0.2/15 mm or less, 0.1/ It may be 15 mm or less, or 0.05 N/15 mm or less.
  • the laminate strength at 70 ° C. between the base material layer and the heat seal layer is 0.01 N / 15 mm or more, 0.05 N / 15 mm or more, 0.1 N / 15 mm or more, 0.2 N / 15 mm or more, 0 .3N/15mm or more, 0.4N/15mm or more, or 0.5N/15mm or more.
  • the lamination strength between the substrate layer and the heat seal layer at 25°C is greater than the lamination strength at 70°C.
  • the lamination strength between the base material layer and the heat-sealing layer is reduced, making it easier to form a space in the softening resin layer. Vapor can then be moved through the formed space.
  • the heat seal layer is an essential constituent layer in the composite film of the present invention.
  • the heat seal layer is a layer that is heat-sealed when forming a structure such as a packaging bag or package. Therefore, the heat seal layer is arranged so as to be the innermost layer of the composite film.
  • the material constituting the heat seal layer is not particularly limited as long as it can be thermally bonded and can impart sufficient sealing strength to the molded structure.
  • Known materials can be applied, for example low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), polypropylene (PP), ethylene- Propylene copolymer (EP), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ionomer resin, ethylene-vinyl acetate copolymer (EVA) and the like.
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • MDPE medium density polyethylene
  • HDPE high density polyethylene
  • PP polypropylene
  • EP ethylene- Propylene copolymer
  • EAA ethylene-acrylic acid copolymer
  • EAA ethylene-methacrylic acid copolymer
  • EVA ionomer resin
  • the heat seal layer constituting the composite film of the present invention is a layer that forms a space for filling the contents. Therefore, when it is desired to impart resistance to contents, it is preferable to use, for example, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or the like.
  • LDPE low-density polyethylene
  • LLDPE linear low-density polyethylene
  • the heat seal layer may be formed using a film preformed from the above materials, or may be a laminate in which a substrate layer, a thermosoftening adhesive resin layer, and optionally other layers are laminated.
  • a material for forming a heat seal layer may be melted, extruded, and cooled to solidify on the surface.
  • the resin or the like constituting the heat seal layer is not limited to one type, and two or more types may be blended, and if necessary, additives for imparting functionality etc. good too.
  • the heat-seal layer may be a single layer or may be composed of multiple layers.
  • the heat-sealing layer constituting the composite film of the present invention may have easy peelability (easily openability) so that the joint portion can be easily opened during use. If a heat-sealable layer having easy peelability is used, for example, when a lid material is formed from the composite film of the present invention and heat-sealed with a container body to form a package, it is difficult to open the package to take out the contents. easier.
  • the composite film of the present invention may have a half cut that is applied from the heat seal layer side and reaches the thermosoftening adhesive resin layer.
  • half-cut refers to a cut that is formed in the thickness direction of the composite film and does not penetrate the composite film in the thickness direction.
  • the heat-sealing layer will be the inside of the structure, that is, the layer that will come into contact with the contents. Therefore, steam generated from the contents by heating enters the composite film in the thickness direction through the half-cut.
  • thermosoftening adhesive resin layer is directly warmed by the heat of the steam, and softens more easily than in the case of being indirectly warmed.
  • the half cut C is provided from the heat seal layer 3 side and reaches the surface of the thermosoftening adhesive resin layer 2.
  • the depth of the half cut may be up to the surface of the thermosoftening adhesive resin layer, or even to the inside of the thermosoftening adhesive resin layer. It may be penetrating, or it may be either.
  • the depth of the half-cut does not reach the base material layer, which is the outermost layer of the composite film.
  • the strength of the structure formed from the composite film may decrease.
  • the half cut is applied only to the heat seal layer. If only the heat-seal layer can be half-cut, the effect of half-cutting can be enjoyed while the strength of the composite film is maximized.
  • the shape of the half-cut can be either a continuous line or an intermittent line. Moreover, at least one line may be applied, and the number is not limited. When providing a plurality of half-cuts, it is preferable that the half-cuts are substantially parallel to each other.
  • the length of the half cut is not particularly limited. The length may be such that it is provided only at a portion where it is desired to vent steam, or it may be provided evenly over the entire composite film.
  • the method of forming the half-cut is not particularly limited.
  • the composite film after forming the composite film, it may be made with a laser or the like.
  • a composite film may be formed by starting from the heat-sealable layer side of the sheet containing the layers and then laminating it with other layers.
  • the composite film of the present invention may contain layers other than the base material layer, the heat-softening adhesive resin layer, and the heat seal layer as essential constituent layers.
  • a barrier layer for imparting barrier properties for imparting barrier properties
  • a reinforcing layer for reinforcing strength for reinforcing strength
  • an adhesive for bonding between layers layers and the like for example, a barrier layer for imparting barrier properties, a reinforcing layer for reinforcing strength, or an adhesive for bonding between layers layers and the like.
  • barrier layer for imparting barrier properties, for example, ethylene-vinyl alcohol copolymer (EVOH), nylon (NY), and polyvinylidene chloride (PVDC) exhibiting a function of blocking gases such as oxygen and water vapor. , or a layer made of polyacrylonitrile (PAN).
  • EVOH ethylene-vinyl alcohol copolymer
  • NY nylon
  • PVDC polyvinylidene chloride
  • PAN polyacrylonitrile
  • Examples of materials for the reinforcing layer to reinforce strength include paper, synthetic paper, and non-woven fabric. They may be coated with an adhesive to provide adhesion to adjacent layers. Moreover, it is also possible to provide a layer made of the material constituting the base material layer as a reinforcing layer separately from the base material layer.
  • adhesive layers for bonding between layers include layers made of ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), and ionomer.
  • EAA ethylene-acrylic acid copolymer
  • EEMAA ethylene-methacrylic acid copolymer
  • ionomer ionomer
  • the other layer may be a layer made of an adhesive used when dry laminating or hot-melting laminating layers together.
  • the resins and the like that constitute the other layers may be blended not only in one type but also in a blend of two or more types.
  • additives and the like for imparting functionality and the like may be blended as necessary.
  • the method for producing the composite film of the present invention is not particularly limited, and known methods can be employed. Examples include dry lamination, hot melt lamination, extrusion lamination, sandwich lamination, and the like.
  • a laminate may be formed by bonding a film that serves as a base layer and a film that serves as a heat seal layer with an adhesive composition that serves as a thermosoftening adhesive resin layer.
  • the coating amount of the adhesive composition for forming the heat-softening adhesive resin layer is not particularly limited, but for example, 5.0 g/m 2 or less, 4.5 g /m 2 or less, 4.0 g/m 2 or less, 3.5 g/m 2 or less, 3.0 g/m 2 or less, 2.5 g/m 2 or less, 2.0 g/m 2 or less, 1.5 g/m 2 or less, or 1.0 g/m 2 or less, 0.25 g/m 2 or more, 0.5 g/m 2 or more, 0.75 g/m 2 or more, 1.0 g/m 2 or more; It may be 5 g/m 2 or more.
  • the coating amount of the adhesive composition is less than 2.5 g/m 2
  • the composite film of the present invention is applied from the heat-sealing layer side until it reaches the heat-softening adhesive resin layer.
  • the adhesive composition has a half-cut that is in the same direction, leakage of the adhesive composition from the half-cut can be suppressed in the process of processing the composite film.
  • the method for manufacturing a composite film having half cuts is not particularly limited, but for example, a method of manufacturing half cuts with a laser or the like after manufacturing a composite film can be mentioned.
  • half-cuts may be produced during the production of the composite film, and the layer having the half-cuts and other layers may be laminated to form a composite film.
  • the sheet containing the heat-sealing layer is cut using a rotary die cutter to penetrate the heat-sealing layer in the thickness direction (half-cut production step), and then the sheet containing the heat-sealing layer is cut.
  • a composite film can be produced by laminating a substrate layer and a thermosoftening adhesive resin layer (lamination step).
  • FIG. 2 is a diagram showing a packaging bag according to one embodiment of the present invention.
  • FIG. 3 is a schematic view of the packaging bag according to one embodiment of the present invention when steam is vented.
  • the structure formed using the composite film of the present invention is not particularly limited. Since the innermost layer of the composite film of the present invention is a heat-sealing layer, the heat-sealing layers are heat-sealed to each other, or the heat-sealing layer is heat-sealed to the flange portion of a container body having a flange. Various structures can be formed.
  • FIG. 2 is a diagram showing a packaging bag formed by heat-sealing heat seal layers to each other.
  • FIG. 2 shows a packaging bag 100 in which the outer peripheries of the composite film 10 of the present invention having half cuts C are heat-sealed to each other to form a seal portion 4 .
  • the composite film 10 is a laminate composed of the substrate layer 1, the thermosoftening adhesive resin layer 2, and the heat seal layer 3 shown in FIG. Each layer extends in the XY plane defined by the direction and the Y direction, and the Z direction (not shown) is the thickness direction of the composite film 10 . That is, FIG. 2 is a top view of the packaging bag 100 viewed from the base material layer 1 side.
  • the half cuts C are provided in intermittent straight lines and cross the sealing portion 4 of the packaging bag 100 from the inside to the outside of the packaging bag 100. is formed as
  • FIG. 3 is a cross-sectional view showing the Z direction (not shown) of the composite film 10.
  • the packaging bag 100 shown in FIG. 2 is formed from the composite film 10 shown in FIG. 1, and the packaging bag 100 is heated to generate steam 5 from the contents of the packaging bag 100. 2 shows a state in which the heat-softening adhesive resin layer 2 of the composite film 10 is softened by steam 5.
  • FIG. 3 shows a state in which the heat-softening adhesive resin layer 2 of the composite film 10 is softened by steam 5.
  • the steam 5 generated inside the packaging bag 100 enters the thickness direction (Z direction) of the composite film 10 from the half cut C formed in the heat seal layer 3 of the composite film 10, and reaches the thermosoftening adhesive resin layer 2. Upon reaching, heat is directly applied to the thermosoftening adhesive resin layer 2 . As a result, the thermosoftening adhesive resin layer 2 is softened and becomes flexible.
  • the pressure inside the packaging bag 100 increases and rises due to the pressure of steam generated from the contents. Then, as shown in FIG. 3, due to the increase in internal pressure, delamination occurs between the softened heat-softening adhesive resin layer 2 and the heat seal layer 3, and the heat-softening adhesive resin layer 2 is separated from the steam 5. It is lifted outside the packaging bag 100 by the pressure, and a space 6 is formed in the peeled portion.
  • Vapor 5 generated from the contents passes through the space 6 generated in the area of the half-cut C formed to traverse the sealing portion 4, and passes from the inside of the packaging bag 100 to the outside as shown in FIG. is discharged to
  • the structure formed using the composite film of the present invention is not particularly limited.
  • a three-side seal bag For example, by heat-sealing the heat seal layers of the composite film of the present invention to each other, a three-side seal bag, a four-side seal bag, a gusset packaging bag, a pillow packaging bag, a gobel top type bottomed container, Tetra Classic (registered trademark) , brick packs, tube containers, and the like.
  • a zipper can be provided on the heat seal layer to form a packaging bag with a zipper.
  • an openable package can be made by forming a lid material from the composite film of the present invention and heat-sealing it to the container body.
  • the packaging bag can be produced by heat-sealing the heat-seal layers of the composite film of the present invention to each other to form a sealed portion.
  • the composite film may be half-cut, and the seal portions in which the heat-seal layers are heat-sealed to each other may be arranged so that the half-cuts traverse from the inside to the outside of the packaging bag.
  • a space for passing steam can be formed in the half-cut portion when the packaging bag is heated. Steam generated inside the packaging bag can be discharged to the outside of the packaging bag through the space.
  • Such a packaging bag can be suitably used as a packaging bag that is heated, and is very useful as a packaging bag for microwave ovens, for example.
  • the composite film of the present invention can also serve as a lid material for sealing the upper end opening of the container body.
  • Sealing of the container body is performed by heat-sealing the heat-seal layer of the composite film to the container body so that the top opening of the container is covered with the lid material made of the composite film of the present invention, thereby forming an unsealable joint. can be formed.
  • the heat seal layer of the lid material made of the composite film of the present invention is heat-sealed to the flange of the container body to form an unsealable joint. , may form a lidded container.
  • the formed sealed container becomes a lidded container that is easy to open.
  • the composite film may be half-cut, and the half-cut may be arranged so as to traverse from the inside to the outside of the container body at the joint where the flange of the container body and the heat seal layer are heat-sealed.
  • Such a container with a lid can be suitably used as a container with a lid that is heated, and is very useful as a container with a lid for microwave ovens, for example.
  • Base layer PET #12 Biaxially stretched PET film (Toyobo Ester (registered trademark) E5100, Toyobo Co., Ltd., thickness: 12 ⁇ m) ⁇ OPP #20: Biaxially stretched PP film (Pyrene (registered trademark) P2161, Toyobo Co., Ltd., thickness: 20 ⁇ m) ⁇ Ny # 15: Nylon film (Bonil (registered trademark) RX, KOHJIN Film & Chemicals Co., Ltd., thickness: 15 ⁇ m)
  • Heat seal layer CPP#20 unstretched PP film (Pyrene (registered trademark) P1128, Toyobo Co., Ltd., thickness: 20 ⁇ m)
  • CPP #30 Non-stretched PP film (Pyrene (registered trademark) P1128, Toyobo Co., Ltd., thickness: 30 ⁇ m)
  • E1901T #50 Laminated PP film (Differene (registered trademark) E1901T, DIC Corporation, thickness: 50 ⁇ m)
  • the film to be the heat-seal layer in the laminate is cut so as to penetrate in the thickness direction of the heat-seal layer (half-cut manufacturing step), and then the sheet including the heat-seal layer is coated with the base layer and the heat-softening adhesive resin.
  • the layers were laminated to obtain a composite film with half cuts.
  • Example 2 the film to be the heat-seal layer in the laminate was cut so as to penetrate in the thickness direction of the heat-seal layer (half-cut production step), and then the sheet containing the heat-seal layer was coated with the base material.
  • a composite film having a half cut was obtained by laminating the layer and the thermosoftening adhesive resin layer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
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Abstract

An adhesive composition of a specific configuration is applied as a heat-softening adhesive resin layer of the composite film, which is a packaging material. Specifically, the composite film 10 is formed by laminating at least a substrate layer 1, a heat-softening adhesive resin layer 2 and a heat seal layer 3, in that order, and the heat-softening adhesive resin layer 2 is configured from a heat-softening adhesive resin that forms a crosslinked structure.

Description

複合フィルム、包装袋、蓋材、蓋付き容器、及び複合フィルムの製造方法Composite film, packaging bag, lid material, container with lid, and method for manufacturing composite film
　本発明は、複合フィルム、包装袋、蓋材、蓋付き容器、及び複合フィルムの製造方法に関する。 The present invention relates to a composite film, a packaging bag, a lid material, a lidded container, and a method for manufacturing a composite film.
　従来、食品が充填されたパウチ商品は、容器内で発生する水蒸気を抜くために、電子レンジによる加熱の前に、パウチの開封を実施していた。 Conventionally, pouch products filled with food had to be opened before being heated in a microwave oven in order to remove the steam generated inside the container.
　これに対して、電子レンジによる加熱時に、蒸気抜きの孔が形成される包装用シートが提案されている。例えば、特許文献１には、基材フィルムとシーラントフィルムとが積層された電子レンジ調理用食品の包装用シート材が開示されており、シーラントフィルムを、異なる融点を有しかつ互いに熱接着性を有する熱可塑性樹脂からなる層の積層体とすることで、電子レンジ調理時の加熱により、包装用シート材のシーラントフィルムがヒートシールされたヒートシール部を部分的に破壊して、脱気孔を形成することが提案されている。 In response to this, a packaging sheet has been proposed in which holes are formed to release steam when heated in a microwave oven. For example, Patent Literature 1 discloses a sheet material for packaging food for microwave cooking in which a base film and a sealant film are laminated, and the sealant films have different melting points and are thermally adhesive to each other. By forming a laminated body of layers made of a thermoplastic resin having, the heat-sealed part where the sealant film of the packaging sheet material is heat-sealed is partially destroyed by heating during microwave cooking, forming a vent hole. It is proposed to
　特許文献１に記載の包装用シート材によれば、ヒートシール部の不特定箇所から蒸通することは可能である。しかしながら、ヒートシール部において、特定の箇所から蒸通することはできていなかった。 According to the packaging sheet material described in Patent Document 1, it is possible to evaporate from an unspecified portion of the heat-sealed portion. However, in the heat-sealed portion, it was not possible to evaporate from a specific portion.
　これに対して、意図した位置から蒸気抜き可能な、電子レンジ用パウチが知られている。 In contrast, microwave pouches are known that allow steam to be vented from an intended position.
　例えば、特許文献２には、パウチの包装材料として、基材層、熱軟化性層、及びヒートシール層が、この順で積層された積層体が提案されている。そして、積層体のヒートシール層側からハーフカットを施すことで、電子レンジで加熱調理したときに、ヒートシール層同士が熱融着されたヒートシール部において、当該ハーフカットを通して蒸気を通過させることが提案されている。 For example, Patent Document 2 proposes, as a pouch packaging material, a laminate in which a base material layer, a thermosoftening layer, and a heat seal layer are laminated in this order. Then, by half-cutting from the heat-seal layer side of the laminate, steam can pass through the half-cut at the heat-sealed portion where the heat-seal layers are heat-sealed to each other when cooked in a microwave oven. is proposed.
特開平１１－１６５７７１号公報JP-A-11-165771 特開２０１７－１２４８５９号公報JP 2017-124859 A
　しかしながら、特許文献２に記載された包装材料は、基材層とヒートシール層との間に、熱軟化性樹脂層以外に接着層を有していた。具体的には、特許文献２では、熱軟化性樹脂層はハーフカットが施された領域のみに配置されており、熱軟化性樹脂層は、全面に配置されている接着層の中に点在して埋め込まれる状態となっていた。 However, the packaging material described in Patent Document 2 has an adhesive layer in addition to the thermosoftening resin layer between the base material layer and the heat seal layer. Specifically, in Patent Document 2, the thermosoftening resin layer is arranged only in the half-cut region, and the thermosoftening resin layer is scattered in the adhesive layer arranged on the entire surface. It was in a state where it was embedded as
　このため、特許文献２に記載された包装材料は、積層体の製造工程が複雑になるばかりか、コストも大きくなるという問題があった。 For this reason, the packaging material described in Patent Document 2 has the problem that not only the manufacturing process of the laminate becomes complicated, but also the cost increases.
　本発明は、上記の背景に鑑みてなされたものであり、基材層とヒートシール層との間に、熱軟化性を有する樹脂層の１層のみを配置した場合であっても、従来と同等の蒸気抜き性能を実現できるとともに、必要な個所にハーフカットを設けることで電子レンジ等による加熱に際して蒸気抜きの箇所を特定することができ、更に、ラミ浮きの発生が抑制された、複合フィルム、当該複合フィルムから形成された包装袋、蓋材、蓋付き容器、及び複合フィルムの製造方法を提供することを目的とする。 The present invention has been made in view of the above background. A composite film that can achieve the same steam release performance, can specify the steam release location when heating with a microwave oven, etc. by providing half cuts at necessary locations, and further suppresses the occurrence of lamination floating. , a packaging bag formed from the composite film, a lid material, a lidded container, and a method for manufacturing the composite film.
　本発明者らは、上記課題を解決するため鋭意検討を行った。そして、包装材料となる複合フィルムの熱軟化性樹脂層として、特定の構成の接着剤組成物を適用すれば、上記の課題と解決できることを見出し、本発明を完成させるに至った。すなわち、本発明は、以下のとおりである。 The present inventors have made intensive studies to solve the above problems. Then, the present inventors have found that the above problems can be solved by applying an adhesive composition having a specific configuration as a heat-softening resin layer of a composite film that serves as a packaging material, and have completed the present invention. That is, the present invention is as follows.
　《態様１》
　少なくとも、基材層と、熱軟化性接着樹脂層と、ヒートシール層と、がこの順で積層された複合フィルムであって、
　前記熱軟化性接着樹脂層は、架橋構造を有する熱軟化性接着剤樹脂から構成されている、
複合フィルム。
　《態様２》
　前記熱軟化性接着剤樹脂は、主剤１質量部に対して硬化剤０．２質量部未満含む接着剤組成物から形成される、態様１に記載の複合フィルム。
　《態様３》
　前記熱軟化性接着剤樹脂は、主剤１質量部に対して硬化剤を、０．１２５質量部を超え０．２質量部未満含む接着剤組成物から形成される、態様１に記載の複合フィルム。
　《態様４》
　前記熱軟化性接着樹脂層は、前記接着剤組成物の塗工量が２．５ｇ／ｍ２未満の層である、態様２又は３に記載の複合フィルム。
　《態様５》
　前記熱軟化性接着剤樹脂は、エーテル系樹脂である、態様１～４のいずれか一態様に記載の複合フィルム。
　《態様６》
　前記基材層と前記ヒートシール層との間の２５℃におけるラミネート強度は、１．３Ｎ/１５ｍｍ以上であり、
　前記基材層と前記ヒートシール層との間の７０℃におけるラミネート強度は、０．６Ｎ/１５ｍｍ以下である、
態様１～５のいずれか一態様に記載の複合フィルム。
　《態様７》
　前記複合フィルムは、前記ヒートシール層の側から施され、前記熱軟化性接着樹脂層に到達しているハーフカットを有する、態様１～６のいずれか一態様に記載の複合フィルム。
　《態様８》
　前記ヒートシール層が互いに熱融着されて形成されたシール部を備える、態様７に記載の複合フィルムから形成された包装袋であって、
　前記ハーフカットは、前記包装袋の内側から外側まで、前記シール部を横断する、包装袋。
　《態様９》
　電子レンジ用である、態様８に記載の包装袋。
　《態様１０》
　容器本体の上端開口部を密封するための、態様７に記載の複合フィルムから形成された蓋材であって、
　前記密封は、前記上端開口部を前記蓋材が被覆するように、前記ヒートシール層が前記容器本体に熱融着されて、開封可能な接合部を形成するものであり、
　前記ハーフカットは、前記接合部において、前記容器本体の内側から外側まで横断するように配置されている、蓋材。
　《態様１１》
　電子レンジ用である、態様１０に記載の蓋材。
　《態様１２》
　容器本体と、
　前記容器本体の上端開口部を密封するための、態様７に記載の複合フィルムから形成された蓋材と、
を含む開封可能な蓋付き容器であって、
　前記容器本体の前記上端開口部は、フランジを有し、
　前記ヒートシール層が前記フランジに熱融着されて、開封可能な接合部を形成し、
　前記ハーフカットは、前記容器本体の内側から外側まで、前記接合部を横断する、
開封可能な蓋付き容器。
　《態様１３》
　電子レンジ用である、態様１２に記載の蓋付き容器。
　《態様１４》
　態様７に記載の複合フィルムの製造方法であって、
　前記ヒートシール層を含むシートに、ロータリーダイカッターにより、前記ヒートシール層の厚み方向に貫通させるカットを施す、ハーフカット作製工程と、
　前記ハーフカット作製工程の後に、前記ヒートシール層を含むシートに、前記基材層及び／又は前記熱軟化性接着樹脂層を積層する積層工程と、を備える、
複合フィルムの製造方法。 <<Aspect 1>>
A composite film in which at least a substrate layer, a thermosoftening adhesive resin layer, and a heat seal layer are laminated in this order,
The thermosoftening adhesive resin layer is composed of a thermosoftening adhesive resin having a crosslinked structure,
composite film.
<<Aspect 2>>
The composite film according to aspect 1, wherein the heat-softening adhesive resin is formed from an adhesive composition containing less than 0.2 parts by weight of a curing agent per 1 part by weight of a main agent.
<<Aspect 3>>
The composite film according to aspect 1, wherein the thermosoftening adhesive resin is formed from an adhesive composition containing more than 0.125 parts by mass and less than 0.2 parts by mass of a curing agent with respect to 1 part by mass of a main agent. .
<<Aspect 4>>
The composite film according to aspect 2 or 3, wherein the heat-softening adhesive resin layer is a layer having a coating amount of the adhesive composition of less than 2.5 g/m 2 .
<<Aspect 5>>
The composite film according to any one of aspects 1 to 4, wherein the thermosoftening adhesive resin is an ether-based resin.
<<Aspect 6>>
The laminate strength at 25° C. between the base material layer and the heat seal layer is 1.3 N/15 mm or more,
The laminate strength at 70° C. between the base layer and the heat seal layer is 0.6 N/15 mm or less.
A composite film according to any one of aspects 1-5.
<<Aspect 7>>
The composite film according to any one of aspects 1 to 6, wherein the composite film is applied from the heat seal layer side and has a half cut reaching the thermosoftening adhesive resin layer.
<<Aspect 8>>
A packaging bag formed from the composite film according to aspect 7, wherein the heat-seal layers are provided with a seal portion formed by heat-sealing each other,
The packaging bag, wherein the half-cut crosses the sealing portion from the inside to the outside of the packaging bag.
<<Aspect 9>>
The packaging bag according to aspect 8, which is for a microwave oven.
<<Aspect 10>>
A lid material formed from the composite film according to aspect 7 for sealing an upper end opening of a container body, comprising:
The sealing is such that the heat seal layer is heat-sealed to the container body so that the upper end opening is covered with the lid material to form an unsealable joint,
The lid member, wherein the half-cuts are arranged so as to traverse from the inside to the outside of the container body at the joint.
<<Aspect 11>>
The lid material according to aspect 10, which is for a microwave oven.
<<Aspect 12>>
a container body;
a lid material formed from the composite film according to aspect 7 for sealing the upper end opening of the container body;
An openable lidded container comprising
The upper end opening of the container body has a flange,
the heat-seal layer is heat-sealed to the flange to form an openable joint;
The half-cut traverses the joint from the inside to the outside of the container body,
A container with an openable lid.
<<Aspect 13>>
The lidded container according to aspect 12, which is for a microwave oven.
<<Aspect 14>>
A method for producing a composite film according to aspect 7, comprising:
A half-cut production step of cutting the sheet including the heat seal layer with a rotary die cutter so as to penetrate in the thickness direction of the heat seal layer;
A lamination step of laminating the base material layer and/or the thermosoftening adhesive resin layer on the sheet containing the heat seal layer after the half-cut production step,
A method for manufacturing a composite film.
　本発明の複合フィルムによれば、基材層とヒートシール層との間に、熱軟化性を有する樹脂層の１層のみを配置した構成であっても、従来と同等の蒸気抜き性能を有する、パウチ等の包装袋や、開封可能な容器等を作製することができる。 According to the composite film of the present invention, even if only one layer of a resin layer having heat softening property is arranged between the base material layer and the heat seal layer, it has the same vapor release performance as the conventional one. , packaging bags such as pouches, openable containers, and the like can be produced.
　また、基材層とヒートシール層との間に、熱軟化性接着樹脂層以外に接着層を配置しない構成とした場合には、複合フィルムの製造工程を簡易なものとすることができるため、生産能力及び生産コストに寄与することができる。 In addition, when an adhesive layer other than the thermosoftening adhesive resin layer is not arranged between the base material layer and the heat seal layer, the manufacturing process of the composite film can be simplified. It can contribute to production capacity and production costs.
　更に、必要となる箇所にハーフカットを備えさせることによって、電子レンジ等による加熱に際して、意図した位置から蒸気抜きを実施することができる。 Furthermore, by providing half-cuts where necessary, steam can be removed from the intended position when heating with a microwave oven or the like.
　更に、本発明の複合フィルムは、保管時等においてラミ浮きの発生、及びそれによる外観不良が抑制された複合フィルムとなるため、本発明の複合フィルムによる包装材によれば、食品等の内容物の保管性を改善することができる。 Furthermore, the composite film of the present invention is a composite film that suppresses the occurrence of lamination during storage and the resulting appearance defects. storability can be improved.
本発明の一実施形態に係る複合フィルムの断面図である。1 is a cross-sectional view of a composite film according to one embodiment of the invention; FIG. 本発明の一実施形態に係る包装袋を示す図である。It is a figure which shows the packaging bag which concerns on one Embodiment of this invention. 本発明の一実施形態に係る包装袋が、蒸気抜きするときの概略図である。FIG. 4 is a schematic view of the packaging bag according to one embodiment of the present invention when steam is vented.
　《複合フィルム》
　本発明の複合フィルムは、少なくとも、基材層と、熱軟化性接着樹脂層と、ヒートシール層と、がこの順で積層された複合フィルムであり、熱軟化性接着樹脂層が、架橋構造を有する熱軟化性接着剤樹脂から構成されている、
複合フィルム。 《Composite film》
The composite film of the present invention is a composite film in which at least a substrate layer, a heat-softening adhesive resin layer, and a heat-sealing layer are laminated in this order, and the heat-softening adhesive resin layer has a crosslinked structure. is composed of a heat-softening adhesive resin having
composite film.
　《複合フィルムの構成》
　以下に、図面を参照しながら、本発明の複合フィルムの構成について説明する。図１に、本発明の複合フィルムの一実施形態に係る断面図を示す。 《Construction of Composite Film》
The configuration of the composite film of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross-sectional view of one embodiment of the composite film of the present invention.
　図１に示される本発明の複合フィルムの一実施形態に係る複合フィルム１０は、基材層１と、基材層１の内側に積層配置された熱軟化性接着樹脂層２と、熱軟化性接着樹脂層２の内側に積層配置されたヒートシール層３と、を備える。 A composite film 10 according to one embodiment of the composite film of the present invention shown in FIG. and a heat seal layer 3 laminated inside the adhesive resin layer 2 .
　本発明の複合フィルムは、基材層と、熱軟化性接着樹脂層と、ヒートシール層と、を必須の構成として含み、これらがこの順で積層されている。本発明においては、基材層、熱軟化性接着樹脂層、及びヒートシール層以外に、任意の層を備えていてもよく、任意の層としては、例えば、バリア性を付与するためのバリア層や、強度を補強するための補強層、あるいは、層と層との間を接着するための接着層等が挙げられる。 The composite film of the present invention includes a substrate layer, a thermosoftening adhesive resin layer, and a heat seal layer as essential components, which are laminated in this order. In the present invention, any layer may be provided in addition to the base material layer, the thermosoftening adhesive resin layer, and the heat seal layer. Examples of the optional layer include a barrier layer for imparting barrier properties. , a reinforcing layer for reinforcing strength, or an adhesive layer for bonding between layers.
　図１に示される複合フィルム１０は、本発明において必須の構成である、基材層１、熱軟化性接着樹脂層２、及びヒートシール層３のみを備える態様であるが、例えば、基材層１、熱軟化性接着樹脂層２、ヒートシール層３との間や、これらの層を含む積層体の外側に、これら以外の層が存在していてもよい。 The composite film 10 shown in FIG. 1 is a mode comprising only the base material layer 1, the heat-softening adhesive resin layer 2, and the heat seal layer 3, which are essential components in the present invention. 1. Layers other than these may exist between the thermosoftening adhesive resin layer 2 and the heat seal layer 3 or outside the laminate containing these layers.
　本発明の複合フィルムを構成するそれぞれの層の厚み等は、複合フィルムの用途等に応じて、適宜決定することができる。 The thickness of each layer constituting the composite film of the present invention can be appropriately determined according to the use of the composite film.
　＜基材層＞
　基材層は、本発明の複合フィルムにおいて、必須の構成層である。 <Base material layer>
The substrate layer is an essential constituent layer in the composite film of the present invention.
　本発明の複合フィルムは、基材層、熱軟化性接着樹脂層、及びヒートシール層が、この順で積層されているため、基材層は、例えば包装袋や包装体等の構造体を形成したときに、構造体の外層となる。このため、基材層は、最内層となるヒートシール層を熱融着して構造体を形成する時の保護層となりうる。また、内容物の表示等のための印刷を施すための印刷層ともなりうる。 In the composite film of the present invention, the substrate layer, the thermosoftening adhesive resin layer, and the heat seal layer are laminated in this order, so the substrate layer forms a structure such as a packaging bag or package. becomes the outer layer of the structure. Therefore, the base layer can serve as a protective layer when the heat-seal layer, which is the innermost layer, is heat-sealed to form a structure. In addition, it can also be a printing layer for printing for displaying contents and the like.
　基材層を構成する材料としては、樹脂等、特に保護層となり、印刷が可能となる樹脂等であれば、特に限定されるものではない。一般的に用いられている樹脂を用いることができ、例えば、ポリエチレンテレフタレート（ＰＥＴ）、ポリエチレンナフタレ－ト（ＰＥＮ）、ポリブチレンテレフタレート（ＰＢＴ）等のポリエステル、ポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）、ポリスチレン（ＰＳ）等のポリオレフィン、ナイロン－６、ナイロン－６６等のポリアミド（ＰＡ）、ポリカーボネート（ＰＣ）等が挙げられる。 The material constituting the base material layer is not particularly limited as long as it is a resin or the like, especially a resin or the like that can be used as a protective layer and can be printed. Commonly used resins can be used, for example, polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyethylene (PE), polypropylene (PP) , polyolefins such as polystyrene (PS), polyamides (PA) such as nylon-6 and nylon-66, and polycarbonates (PC).
　基材層を構成する樹脂等は、１種のみならず、２種以上がブレンドされていてもよく、必要に応じて、機能性等を付与するための添加剤等が配合されていてもよい。 The resin or the like constituting the base material layer may be blended not only in one kind but also in a blend of two or more kinds, and if necessary, an additive or the like for imparting functionality etc. may be blended. .
　なお、基材層は、予め成形されたフィルムから作製されることが好ましい。基材層となるフィルムは、上記の樹脂等から形成されたフィルムであればよく、未延伸であっても、一軸又は二軸延伸が施されていてもよい。中では、二軸延伸フィルムであることが好ましい。 It should be noted that the base material layer is preferably made from a preformed film. The film that serves as the substrate layer may be a film formed from the above-mentioned resin or the like, and may be unstretched or uniaxially or biaxially stretched. Among them, a biaxially stretched film is preferred.
　また、基材層となるフィルムには、酸化珪素、酸化アルミニウム等の酸化物が蒸着されていてもよい。 In addition, oxides such as silicon oxide and aluminum oxide may be vapor-deposited on the film that serves as the base layer.
　更に、基材層となるフィルムは、単層であっても、複層からなる積層体となっていてもよい。 Furthermore, the film that serves as the base layer may be a single layer or a laminate consisting of multiple layers.
　＜熱軟化性接着樹脂層＞
　熱軟化性接着樹脂層は、本発明の複合フィルムにおいて、必須の構成層である。熱軟化性接着樹脂層は、基材層とヒートシール層との間に配置される。 <Heat-softening adhesive resin layer>
The thermosoftening adhesive resin layer is an essential constituent layer in the composite film of the present invention. The thermosoftening adhesive resin layer is arranged between the substrate layer and the heat seal layer.
　（熱軟化性接着剤樹脂）
　本発明の熱軟化性接着樹脂層を構成する熱軟化性接着剤樹脂は、架橋構造を有する。熱軟化性接着剤樹脂を形成するための材料としては、特に限定されるものではなく、架橋構造を形成することができ、熱により軟化し、接着性を有する樹脂層を形成できるものであればよい。
複合フィルム。 (Heat softening adhesive resin)
The thermosoftening adhesive resin constituting the thermosoftening adhesive resin layer of the present invention has a crosslinked structure. The material for forming the heat-softening adhesive resin is not particularly limited as long as it can form a crosslinked structure, is softened by heat, and can form an adhesive resin layer. good.
composite film.
　熱軟化性接着剤樹脂を形成する材料となる熱軟化性接着剤組成物としては、例えば、主剤と硬化剤とを含む接着剤組成物であってよい。 The thermosoftening adhesive composition, which is the material forming the thermosoftening adhesive resin, may be, for example, an adhesive composition containing a main agent and a curing agent.
　｛主剤｝
　熱軟化性接着剤樹脂を形成する材料となる、接着剤組成物を構成する主剤は、特に限定されるものではないが、基材層へのドライラミネートが容易となる観点から、常温で液状であるものが好ましい。例えば、ポリオールが挙げられ、ポリオールとしては、例えば、ポリカーボネートポリオール、ポリカプロラクトンポリオール、ポリエステルポリオール、ポリエーテルポリオール、ポリオレフィンポリオール、アクリルポリオール、シリコーンポリオール、ヒマシ油系ポリオール、フッ素系ポリオール等が挙げられる。主剤は、１種単独でも、２種類以上を併用してもよい。 {Main agent}
The main agent constituting the adhesive composition, which is the material for forming the thermosoftening adhesive resin, is not particularly limited, but from the viewpoint of facilitating dry lamination to the substrate layer, it is liquid at room temperature. Some are preferred. Examples include polyols, and examples of polyols include polycarbonate polyols, polycaprolactone polyols, polyester polyols, polyether polyols, polyolefin polyols, acrylic polyols, silicone polyols, castor oil-based polyols, fluorine-based polyols, and the like. The main agent may be used singly or in combination of two or more.
　中では、ポリエステルポリオール又はポリエーテルポリオールが好適に用いられ、速硬化の観点からより好ましくは、ポリエステルポリウレタンポリオール及びポリエーテルポリウレタンポリオールからなる群から選ばれる少なくとも１種のポリオールであってよい。 Among them, polyester polyols or polyether polyols are preferably used, and more preferably at least one polyol selected from the group consisting of polyester polyurethane polyols and polyether polyurethane polyols from the viewpoint of rapid curing.
　特には、エーテル系樹脂層を形成することのできるポリエーテルポリオールが好適であり、ポリエーテルポリオールとしては、ポリエーテルポリウレタンポリオールであってもよい。 A polyether polyol capable of forming an ether-based resin layer is particularly suitable, and the polyether polyol may be a polyether polyurethane polyol.
　｛硬化剤｝
　熱軟化性接着剤樹脂を形成する材料となる、接着剤組成物を構成する硬化剤は、特に限定されるものではないが、基材層へのドライラミネートが容易となる観点から、常温で液状であるものが好ましい。硬化剤としては、例えば、ポリイソシアネートが挙げられる。 {Curing agent}
The curing agent constituting the adhesive composition, which is the material for forming the thermosoftening adhesive resin, is not particularly limited, but from the viewpoint of facilitating dry lamination to the substrate layer, it is liquid at room temperature. is preferred. Curing agents include, for example, polyisocyanates.
　ポリイソシアネートとしては、例えば、トリメチレンジイソシアネート、テトラメチレンジイソシアネート、ヘキサメチレンジイソシアネート、ペンタメチレンジイソシアネート、１，２－プロピレンジイソシアネート、１，２－ブチレンジイソシアネート、２，３－ブチレンジイソシアネート、１，３－ブチレンジイソシアネート、２，４，４－トリメチルヘキサメチレンジイソシアネート、２，２，４－トリメチルヘキサメチレンジイソシアネート、２，６－ジイソシアナートメチルカプロエート等の脂肪族ジイソシアネート、１，３－シクロペンタンジイソシアネート、１，４－シクロヘキサンジイソシアネート、１，３－シクロヘキサンジイソシアネート、３－イソシアナートメチル－３，５，５－トリメチルシクロヘキシルイソシアネート、４，４’－メチレンビス（シクロヘキシルイソシアネート）、メチル２，４－シクロヘキサンジイソシアネート、メチル２，６－シクロヘキサンジイソシアネート、１，４－ビス（イソシアナートメチル）シクロヘキサン、１，３－ビス（イソシアナートメチル）シクロヘキサン等の脂環族ジイソシアネート、ｍ－フェニレンジイソシアネート、ｐ－フェニレンジイソシアネート、４，４－ジフェニルジイソシアネート、１，５－ナフタレンジイソシアネート、４，４’－ジフェニルメタンジイソシアネート、２，４－トリレンジイソシアネート又は２，６－トリレンジイソシアネートもしくはその混合物、４，４’－トルイジンジイソシアネート、ジアニシジンジイソシアネート、４，４’－ジフェニルエーテルジイソシアネート等の芳香族ジイソシアネート、１，３－キシリレンジイソシアネート、１，４－キシリレンジイソシアネート、テトラメチルキシリレンジイソシアネートもしくはその混合物、ω，ω’－ジイソシアネート－１，４－ジエチルベンゼン等の芳香脂肪族ジイソシアネート、トリフェニルメタン－４，４’４”－トリイソシアネート、１，３，５－トリイソシナトベンゼン、２，４，６－トリイソシアナトトルエン等の芳香族又は芳香脂肪族の有機トリイソシアネート、４，４’－ジフェニルジメチルメタン－２，２’－５，５’－テトライソシアネート等の芳香脂肪族テトライソシアネートで代表される有機テトライソシアネート等のポリイソシアネート単量体等が挙げられる。ポリイソシアネートとしては、これら単量体と他の化合物とが反応して得られる誘導体や付加体、又はこれら単量体から誘導された二量体、三量体等の誘導体であってもよい。 Examples of polyisocyanates include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, and 1,3-butylene diisocyanate. , 2,4,4-trimethylhexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, aliphatic diisocyanates such as 2,6-diisocyanatomethylcaproate, 1,3-cyclopentane diisocyanate, 1, 4-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, 4,4′-methylenebis(cyclohexyl isocyanate), methyl 2,4-cyclohexane diisocyanate, methyl 2, Alicyclic diisocyanates such as 6-cyclohexane diisocyanate, 1,4-bis(isocyanatomethyl)cyclohexane, 1,3-bis(isocyanatomethyl)cyclohexane, m-phenylene diisocyanate, p-phenylene diisocyanate, 4,4-diphenyl diisocyanates, 1,5-naphthalene diisocyanate, 4,4′-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate or 2,6-tolylene diisocyanate or mixtures thereof, 4,4′-toluidine diisocyanate, dianisidine diisocyanate, 4, Aromatic diisocyanates such as 4'-diphenyl ether diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, tetramethyl xylylene diisocyanate or mixtures thereof, ω,ω'-diisocyanate-1,4-diethylbenzene and the like. Aromatic or araliphatic organic compounds such as araliphatic diisocyanates, triphenylmethane-4,4′4″-triisocyanate, 1,3,5-triisocyanatobenzene, and 2,4,6-triisocyanatotoluene. Polyisocyanate monomers such as organic tetraisocyanates typified by triisocyanates and araliphatic tetraisocyanates such as 4,4'-diphenyldimethylmethane-2,2'-5,5'-tetraisocyanate and the like can be mentioned. As polyisocyanates, these monomers and other compounds Derivatives and adducts obtained by reaction, or derivatives such as dimers and trimers derived from these monomers may be used.
　｛主剤と硬化剤との組成比｝
　熱軟化性接着剤樹脂を形成する材料となる、接着剤組成物に含まれる主剤と硬化剤との組成比は、例えば、主剤１質量部に対して、硬化剤０．２質量部未満であってよい。 {Composition ratio of main agent and curing agent}
The composition ratio of the main agent and the curing agent contained in the adhesive composition, which are the materials forming the thermosoftening adhesive resin, is, for example, less than 0.2 parts by mass of the curing agent per 1 part by mass of the main agent. you can
　接着剤組成物に含まれる主剤と硬化剤との組成比が、主剤１質量部に対して硬化剤が０．２質量以上となる場合には、基材層とヒートシール層との間の７０℃におけるラミネート強度の高い、熱軟化性接着樹脂層が形成される。その結果、得られる複合フィルムは、蒸気抜き性能が低下したものとなる。 When the composition ratio of the main agent and the curing agent contained in the adhesive composition is 0.2 mass or more of the curing agent per 1 part by mass of the main agent, the gap between the base material layer and the heat seal layer is 70%. A thermosoftening adhesive resin layer having high lamination strength at °C is formed. As a result, the resulting composite film has reduced vapor release performance.
　一方で、接着剤組成物に含まれる主剤と硬化剤との組成比が、主剤１質量部に対して硬化剤が０．０１質量未満となる場合には、基材層とヒートシール層とを接着する強度の低い、熱軟化性接着樹脂層が形成される。その結果、得られる複合フィルムは、常温でのラミネート強度が弱く、ラミ浮きを発生してしまうことがある。 On the other hand, when the composition ratio of the main agent and the curing agent contained in the adhesive composition is less than 0.01 mass of the curing agent per 1 part by mass of the main compound, the substrate layer and the heat seal layer are separated. A thermosoftening adhesive resin layer having low bonding strength is formed. As a result, the resulting composite film has a weak lamination strength at room temperature, and lamination may occur.
　熱軟化性接着剤樹脂を形成する材料となる、接着剤組成物に含まれる主剤と硬化剤との組成比は、主剤１質量部に対して、硬化剤０．１５質量部以下、０．１２５質量部以下、０．１０質量部以下、０．０７５質量部以下、又は０．０５質量部以下であってよい。 The composition ratio of the main agent and the curing agent contained in the adhesive composition, which is the material for forming the heat-softening adhesive resin, is 0.15 parts by mass or less of the curing agent per 1 part by mass of the main agent, and 0.125 parts by mass. It may be 0.10 parts by mass or less, 0.075 parts by mass or less, or 0.05 parts by mass or less.
　一方、接着剤組成物に含まれる主剤と硬化剤との組成比は、主剤１質量部に対して、硬化剤０．０１質量部以上、０．０２５質量部以上、０．０５質量部以上、０．０７５質量部以上、０．１０質量部以上、０．１２５質量部以上、又は０．１５質量部以上であってよい。 On the other hand, the composition ratio of the main agent and the curing agent contained in the adhesive composition is 0.01 parts by mass or more, 0.025 parts by mass or more, 0.05 parts by mass or more of the curing agent per 1 part by mass of the main agent. It may be 0.075 parts by mass or more, 0.10 parts by mass or more, 0.125 parts by mass or more, or 0.15 parts by mass or more.
　中では、熱軟化性接着剤樹脂を形成する材料となる、接着剤組成物に含まれる主剤と硬化剤との組成比が、主剤１質量部に対して硬化剤が、０．１２５質量部を超え０．２質量部未満であると、本発明の複合フィルムが、ヒートシール層の側から施され、熱軟化性接着樹脂層に到達しているハーフカットを有している場合に、複合フィルムの加工工程において、当該ハーフカットから接着剤組成物が漏出することを抑制することができる。 Among them, the composition ratio of the main agent and the curing agent contained in the adhesive composition, which is the material for forming the heat-softening adhesive resin, is 0.125 parts by mass of the curing agent per 1 part by mass of the main agent. When the amount is more than 0.2 parts by mass and less than 0.2 parts by mass, the composite film of the present invention is applied from the heat seal layer side and has a half cut reaching the heat softening adhesive resin layer. In the processing step of (1), leakage of the adhesive composition from the half-cut can be suppressed.
　｛その他の成分｝
　熱軟化性接着剤樹脂を形成する材料となる接着剤組成物には、主剤と硬化剤以外のその他の成分が、任意に含まれていてもよい。その他の成分としては、例えば、溶剤や、得られる熱軟化性接着樹脂層に機能性を付与するための成分、あるいは添加剤等が挙げられる。 {Other components}
The adhesive composition, which is the material for forming the thermosoftening adhesive resin, may optionally contain components other than the main agent and the curing agent. Other components include, for example, solvents, components for imparting functionality to the resulting thermosoftening adhesive resin layer, additives, and the like.
　（ラミネート強度）
　本発明の複合フィルムは、基材層とヒートシール層との間の２５℃におけるラミネート強度が、１．３Ｎ/１５ｍｍ以上であり、基材層とヒートシール層との間の７０℃におけるラミネート強度が、０．６Ｎ/１５ｍｍ未満である。ここで、本発明において、「ラミネート強度」の測定は、Ｔ字剥離にて、３００ｍｍ／ｍｉｎの条件で実施し、変位２０～５０ｍｍの区間平均を求めることにより行うことができる。 (Laminate strength)
The composite film of the present invention has a laminate strength of 1.3 N/15 mm or more between the substrate layer and the heat seal layer at 25°C, and a laminate strength at 70°C between the substrate layer and the heat seal layer. is less than 0.6 N/15 mm. Here, in the present invention, the "laminate strength" can be measured by performing T-shaped peeling under the condition of 300 mm/min and calculating the section average of the displacement of 20 to 50 mm.
　基材層とヒートシール層との間の２５℃におけるラミネート強度が、１．３Ｎ/１５ｍｍ以上であることにより、本発明の複合フィルムから形成された構造体は、常温付近で十分な強度を有し、保管及び取り扱いに際して基材層とヒートシール層との間での剥離（ラミ浮き）が発生しない。 Since the lamination strength at 25° C. between the base layer and the heat seal layer is 1.3 N/15 mm or more, the structure formed from the composite film of the present invention has sufficient strength around room temperature. Also, during storage and handling, peeling (lamination) does not occur between the base material layer and the heat seal layer.
　基材層とヒートシール層との間の２５℃におけるラミネート強度は、１．５Ｎ/１５ｍｍ以上、１．８Ｎ/１５ｍｍ以上、２．０Ｎ/１５ｍｍ以上、２．４Ｎ/１５ｍｍ以上、２．８Ｎ/１５ｍｍ以上、又は３．０Ｎ/１５ｍｍ以上であってよい。 The laminate strength at 25° C. between the base material layer and the heat seal layer is 1.5 N/15 mm or more, 1.8 N/15 mm or more, 2.0 N/15 mm or more, 2.4 N/15 mm or more, 2.8 N/ It may be 15 mm or more, or 3.0 N/15 mm or more.
　一方で、基材層とヒートシール層との間の２５℃におけるラミネート強度は、６．０Ｎ/１５ｍｍ以下、５．０Ｎ/１５ｍｍ以下、４．５Ｎ/１５ｍｍ以下、４．０Ｎ/１５ｍｍ以下、３．５Ｎ/１５ｍｍ以下、又は３．０Ｎ/１５ｍｍ以下であってよい。 On the other hand, the laminate strength at 25° C. between the base material layer and the heat seal layer is 6.0 N/15 mm or less, 5.0 N/15 mm or less, 4.5 N/15 mm or less, 4.0 N/15 mm or less, 3 .5 N/15 mm or less, or 3.0 N/15 mm or less.
　また、基材層とヒートシール層との間の７０℃におけるラミネート強度が、０．６Ｎ/１５ｍｍ未満であることにより、本発明の複合フィルムから形成された構造体が加熱された場合に、熱軟化性接着樹脂層の中に空間が形成され易くなり、当該空間を通して蒸気を移動させることで、従来と同等の蒸気抜き性能を発揮することができる。 In addition, when the laminate strength at 70°C between the base material layer and the heat seal layer is less than 0.6 N/15 mm, when the structure formed from the composite film of the present invention is heated, Spaces are easily formed in the softening adhesive resin layer, and steam can be transferred through the spaces, thereby exhibiting the same steam release performance as conventional ones.
　基材層とヒートシール層との間の７０℃におけるラミネート強度は、０．５Ｎ/１５ｍｍ以下、０．４Ｎ/１５ｍｍ以下、０．３Ｎ/１５ｍｍ以下、０．２/１５ｍｍ以下、０．１/１５ｍｍ以下、又は０．０５Ｎ/１５ｍｍ以下であってよい。 The laminate strength at 70° C. between the base material layer and the heat seal layer is 0.5 N/15 mm or less, 0.4 N/15 mm or less, 0.3 N/15 mm or less, 0.2/15 mm or less, 0.1/ It may be 15 mm or less, or 0.05 N/15 mm or less.
　一方で、基材層とヒートシール層との間の７０℃におけるラミネート強度は、０．０１Ｎ/１５ｍｍ以上、０．０５Ｎ/１５ｍｍ以上、０．１Ｎ/１５ｍｍ以上、０．２Ｎ/１５ｍｍ以上、０．３Ｎ/１５ｍｍ以上、０．４Ｎ/１５ｍｍ以上、又は０．５Ｎ/１５ｍｍ以上であってよい。 On the other hand, the laminate strength at 70 ° C. between the base material layer and the heat seal layer is 0.01 N / 15 mm or more, 0.05 N / 15 mm or more, 0.1 N / 15 mm or more, 0.2 N / 15 mm or more, 0 .3N/15mm or more, 0.4N/15mm or more, or 0.5N/15mm or more.
　本発明の複合フィルムは、基材層とヒートシール層との間の２５℃におけるラミネート強度が、７０℃におけるラミネート強度より大きいものなっていることで、本発明の複合フィルムを電子レンジ等で加熱した場合に、基材層とヒートシール層との間のラミネート強度が小さくなり、軟化性樹脂層の中に空間を形成し易くなる。そして、形成した空間を通して、蒸気を移動させることができるようになる。 In the composite film of the present invention, the lamination strength between the substrate layer and the heat seal layer at 25°C is greater than the lamination strength at 70°C. In this case, the lamination strength between the base material layer and the heat-sealing layer is reduced, making it easier to form a space in the softening resin layer. Vapor can then be moved through the formed space.
　＜ヒートシール層＞
　ヒートシール層は、本発明の複合フィルムにおいて、必須の構成層である。 <Heat seal layer>
The heat seal layer is an essential constituent layer in the composite film of the present invention.
　ヒートシール層は、例えば包装袋や包装体等の構造体を形成する際に、熱融着される層となる。このため、ヒートシール層は、複合フィルムの最内層となるように配置する。 The heat seal layer is a layer that is heat-sealed when forming a structure such as a packaging bag or package. Therefore, the heat seal layer is arranged so as to be the innermost layer of the composite film.
　ヒートシール層を構成する材料としては、熱接着が可能であり、成形された構造体に十分なシール強度を付与できるものであれば、特に限定されるものではない。公知の材料を適用することができ、例えば、低密度ポリエチレン（ＬＤＰＥ）、直鎖状低密度ポリエチレン（ＬＬＤＰＥ）、中密度ポリエチレン（ＭＤＰＥ）、高密度ポリエチレン（ＨＤＰＥ）、ポリプロピレン（ＰＰ）、エチレン－プロピレン共重合体（ＥＰ）、エチレン－アクリル酸共重合体（ＥＡＡ）、エチレン－メタクリル酸共重合体（ＥＭＡＡ）、アイオノマー樹脂、エチレン－酢酸ビニル共重合体（ＥＶＡ）等が挙げられる。 The material constituting the heat seal layer is not particularly limited as long as it can be thermally bonded and can impart sufficient sealing strength to the molded structure. Known materials can be applied, for example low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), polypropylene (PP), ethylene- Propylene copolymer (EP), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ionomer resin, ethylene-vinyl acetate copolymer (EVA) and the like.
　例えば、内容物が充填される包装袋等の構造体を形成する場合には、本発明の複合フィルムを構成するヒートシール層は、内容物を充填するための空間を形成する層となる。このため、耐内容物性を付与したい場合には、例えば、低密度ポリエチレン（ＬＤＰＥ）、直鎖状低密度ポリエチレン（ＬＬＤＰＥ）等を用いることが好ましい。 For example, when forming a structure such as a packaging bag to be filled with contents, the heat seal layer constituting the composite film of the present invention is a layer that forms a space for filling the contents. Therefore, when it is desired to impart resistance to contents, it is preferable to use, for example, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or the like.
　ヒートシール層は、上記の材料から予め成形されたフィルムを用いて形成してもよいし、基材層、熱軟化性接着樹脂層、及び必要に応じてその他の層が積層された積層体の表面に、ヒートシール層を形成するための材料を溶融して押出し、冷却固化させて形成してもよい。 The heat seal layer may be formed using a film preformed from the above materials, or may be a laminate in which a substrate layer, a thermosoftening adhesive resin layer, and optionally other layers are laminated. A material for forming a heat seal layer may be melted, extruded, and cooled to solidify on the surface.
　また、ヒートシール層を構成する樹脂等は、１種のみならず、２種以上がブレンドされていてもよく、必要に応じて、機能性等を付与するための添加剤等が配合されていてもよい。 In addition, the resin or the like constituting the heat seal layer is not limited to one type, and two or more types may be blended, and if necessary, additives for imparting functionality etc. good too.
　更に、ヒートシール層は、単層であっても、複層からなる構成であっていてもよい。 Furthermore, the heat-seal layer may be a single layer or may be composed of multiple layers.
　なお、本発明の複合フィルムを構成するヒートシール層は、使用の際に接合部の開封が容易となるよう、イージーピール性（易開封性）を有していてもよい。イージーピール性を有するヒートシール層とすれば、例えば、本発明の複合フィルムから蓋材を形成し、容器本体と熱融着させて包装体を形成した場合に、内容物を取り出すための開封が容易となる。 The heat-sealing layer constituting the composite film of the present invention may have easy peelability (easily openability) so that the joint portion can be easily opened during use. If a heat-sealable layer having easy peelability is used, for example, when a lid material is formed from the composite film of the present invention and heat-sealed with a container body to form a package, it is difficult to open the package to take out the contents. easier.
　（ハーフカット）
　本発明の複合フィルムは、ヒートシール層の側から施され、熱軟化性接着樹脂層に到達しているハーフカットを有していてもよい。 (half cut)
The composite film of the present invention may have a half cut that is applied from the heat seal layer side and reaches the thermosoftening adhesive resin layer.
　ここで、ハーフカットとは、複合フィルムの厚さ方向に形成され、複合フィルムの厚さ方向に貫通しない切れ目をいう。 Here, the term "half-cut" refers to a cut that is formed in the thickness direction of the composite film and does not penetrate the composite film in the thickness direction.
　本発明の複合フィルムは、必要となる箇所にハーフカットを備えさせることによって、電子レンジ等による加熱に際して、意図した位置から蒸気抜きを実施することが可能となる。 By equipping the composite film of the present invention with half-cuts where necessary, steam can be removed from the intended position during heating with a microwave oven or the like.
　上記の通り、本発明の複合フィルムから構造体を形成した場合には、ヒートシール層が構造体の内側となり、すなわち、内容物と接する層となる。したがって、加熱によって内容物から発生する蒸気は、ハーフカットを通して、複合フィルムの厚み方向に入り込んでいくこととなる。 As described above, when a structure is formed from the composite film of the present invention, the heat-sealing layer will be the inside of the structure, that is, the layer that will come into contact with the contents. Therefore, steam generated from the contents by heating enters the composite film in the thickness direction through the half-cut.
　このとき、ハーフカットが熱軟化性接着樹脂層に到達していれば、内容物から発生した蒸気は、ハーフカットを通過して直接、熱軟化性接着樹脂層まで到達することとなる。その結果、熱軟化性接着樹脂層は、蒸気の熱によって直接的に温められることとなり、間接的に温められる場合よりも軟化が容易となる。 At this time, if the half-cut reaches the heat-softening adhesive resin layer, the steam generated from the contents passes through the half-cut and directly reaches the heat-softening adhesive resin layer. As a result, the thermosoftening adhesive resin layer is directly warmed by the heat of the steam, and softens more easily than in the case of being indirectly warmed.
　したがって、本発明の複合フィルムは、蒸気抜きが必要となる箇所にハーフカットを備えさせておくことで、意図した位置から蒸気抜きを実施することが可能となる。 Therefore, in the composite film of the present invention, it is possible to perform steam venting from an intended position by providing a half-cut at a location where steam venting is required.
　図１に示される複合フィルム１０においては、ハーフカットＣは、ヒートシール層３の側から設けられ、熱軟化性接着樹脂層２の表面に到達している。 In the composite film 10 shown in FIG. 1, the half cut C is provided from the heat seal layer 3 side and reaches the surface of the thermosoftening adhesive resin layer 2.
　なお、ハーフカットの深さは、熱軟化性接着樹脂層の表面までであっても、あるいは、熱軟化性接着樹脂層の内部まで施されていても、更には、熱軟化性接着樹脂層を貫通していても、いずれであってもよい。 The depth of the half cut may be up to the surface of the thermosoftening adhesive resin layer, or even to the inside of the thermosoftening adhesive resin layer. It may be penetrating, or it may be either.
　ただし、ハーフカットは、複合フィルムの最外層となる基材層には到達しない深さであることが好ましい。ハーフカットが基材層に到達すると、複合フィルムから形成される構造体の強度が低下する場合がある。 However, it is preferable that the depth of the half-cut does not reach the base material layer, which is the outermost layer of the composite film. When the half-cut reaches the substrate layer, the strength of the structure formed from the composite film may decrease.
　特には、ハーフカットは、ヒートシール層のみに施されていることが好ましい。ヒートシール層のみにハーフカットを施すことができれば、複合フィルムの強度が最も高くなる状態で、ハーフカットの効果を享受することができる。 Especially, it is preferable that the half cut is applied only to the heat seal layer. If only the heat-seal layer can be half-cut, the effect of half-cutting can be enjoyed while the strength of the composite film is maximized.
　ハーフカットの形状は、連続的な線であっても、断続的な線であってもいずれでもよい。また、少なくとも１本が施されていればよく、その数は限定されない。複数本のハーフカットを備えさせる場合には、ハーフカット同士は、略並行であることが好ましい。 The shape of the half-cut can be either a continuous line or an intermittent line. Moreover, at least one line may be applied, and the number is not limited. When providing a plurality of half-cuts, it is preferable that the half-cuts are substantially parallel to each other.
　また、ハーフカットの長さは、特に限定されるものではない。蒸気抜きを実施したい箇所のみが備えるような長さであってもよいし、複合フィルムの全体にわたって、均等に設けてもよい。 Also, the length of the half cut is not particularly limited. The length may be such that it is provided only at a portion where it is desired to vent steam, or it may be provided evenly over the entire composite film.
　ハーフカットを形成する方法は、特に限定されるものではなく、例えば、複合フィルムを形成した後に、レーザー等で作製してもよいし、複合フィルムを生産する途中で、ダイカッター等により、ヒートシール層を含むシートのヒートシール層側から作成し、その後に他の層と積層させて複合フィルムとしてもよい。 The method of forming the half-cut is not particularly limited. For example, after forming the composite film, it may be made with a laser or the like. A composite film may be formed by starting from the heat-sealable layer side of the sheet containing the layers and then laminating it with other layers.
　＜その他の層＞
　本発明の複合フィルムは、基材層と、熱軟化性接着樹脂層と、ヒートシール層とを、必須の構成層として含んでいれば、これら以外の層が含まれていてもよい。 <Other layers>
The composite film of the present invention may contain layers other than the base material layer, the heat-softening adhesive resin layer, and the heat seal layer as essential constituent layers.
　その他の層としては、特に限定されるものではなく、例えば、バリア性を付与するためのバリア層や、強度を補強するための補強層、あるいは、層と層との間を接着するための接着層等が挙げられる。 Other layers are not particularly limited. For example, a barrier layer for imparting barrier properties, a reinforcing layer for reinforcing strength, or an adhesive for bonding between layers layers and the like.
　バリア性を付与するためのバリア層としては、例えば、酸素や水蒸気等のガスを遮断する機能を発現する、エチレン－ビニルアルコール共重合体（ＥＶＯＨ）、ナイロン（ＮＹ）、ポリ塩化ビニリデン（ＰＶＤＣ）、又はポリアクリロニトリル（ＰＡＮ）からなる層等が挙げられる。 As a barrier layer for imparting barrier properties, for example, ethylene-vinyl alcohol copolymer (EVOH), nylon (NY), and polyvinylidene chloride (PVDC) exhibiting a function of blocking gases such as oxygen and water vapor. , or a layer made of polyacrylonitrile (PAN).
　強度を補強するための補強層の材料としては、例えば、紙、合成紙、不織布等が挙げられる。これらには、隣接する層との接着性を付与するための接着剤が塗布されていてもよい。また、上記の基材層を構成する材料による層を、基材層とは別に、補強層として備えさせることも可能である。 Examples of materials for the reinforcing layer to reinforce strength include paper, synthetic paper, and non-woven fabric. They may be coated with an adhesive to provide adhesion to adjacent layers. Moreover, it is also possible to provide a layer made of the material constituting the base material layer as a reinforcing layer separately from the base material layer.
　層と層との間を接着するための接着層としては、例えば、エチレン－アクリル酸共重合体（ＥＡＡ）、エチレン－メタクリル酸共重合体（ＥＭＡＡ）、アイオノマーからなる層等が挙げられる。 Examples of adhesive layers for bonding between layers include layers made of ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), and ionomer.
　また、その他の層は、層と層とをドライラミネート又はホットメルトラミネートする際に使用する、接着剤からなる層であってもよい。 Further, the other layer may be a layer made of an adhesive used when dry laminating or hot-melting laminating layers together.
　その他の層を構成する樹脂等は、１種のみならず、２種以上がブレンドされていてもよい。また、必要に応じて、機能性等を付与するための添加剤等が配合されていてもよい。 　The resins and the like that constitute the other layers may be blended not only in one type but also in a blend of two or more types. In addition, additives and the like for imparting functionality and the like may be blended as necessary.
　《複合フィルムの製造方法》
　本発明の複合フィルムの製造方法は、特に限定されるものではなく、公知の方法を採用することができる。例えば、ドライラミネーション法、ホットメルトラミネーション法、エクストルージョンラミネーション法、及びサンドイッチラミネーション方法等が挙げられる。 <<Manufacturing method of composite film>>
The method for producing the composite film of the present invention is not particularly limited, and known methods can be employed. Examples include dry lamination, hot melt lamination, extrusion lamination, sandwich lamination, and the like.
　例えば、基材層となるフィルムと、ヒートシール層となるフィルムとを、熱軟化性接着樹脂層となる接着剤組成物によって接着し、積層体を形成してもよい。 For example, a laminate may be formed by bonding a film that serves as a base layer and a film that serves as a heat seal layer with an adhesive composition that serves as a thermosoftening adhesive resin layer.
　この方法による場合には、熱軟化性接着樹脂層を形成するための接着剤組成物の塗工量は、特に限定されるものではないが、例えば、５．０ｇ／ｍ２以下、４．５ｇ／ｍ２以下、４．０ｇ／ｍ２以下、３．５ｇ／ｍ２以下、３．０ｇ／ｍ２以下、２．５ｇ／ｍ２以下、２．０ｇ／ｍ２以下、１．５ｇ／ｍ２以下、又は１．０ｇ／ｍ２以下であってよく、０．２５ｇ／ｍ２以上、０．５ｇ／ｍ２以上、０．７５ｇ／ｍ２以上、１．０ｇ／ｍ２以上、１．５ｇ／ｍ２以上であってよい。 In the case of this method, the coating amount of the adhesive composition for forming the heat-softening adhesive resin layer is not particularly limited, but for example, 5.0 g/m 2 or less, 4.5 g /m 2 or less, 4.0 g/m 2 or less, 3.5 g/m 2 or less, 3.0 g/m 2 or less, 2.5 g/m 2 or less, 2.0 g/m 2 or less, 1.5 g/m 2 or less, or 1.0 g/m 2 or less, 0.25 g/m 2 or more, 0.5 g/m 2 or more, 0.75 g/m 2 or more, 1.0 g/m 2 or more; It may be 5 g/m 2 or more.
　中でも、接着剤組成物の塗工量が２．５ｇ／ｍ２未満である場合には、本発明の複合フィルムが、ヒートシール層の側から施され、熱軟化性接着樹脂層に到達しているハーフカットを有している場合に、複合フィルムの加工工程において、当該ハーフカットから接着剤組成物が漏出することを抑制することができる。 Above all, when the coating amount of the adhesive composition is less than 2.5 g/m 2 , the composite film of the present invention is applied from the heat-sealing layer side until it reaches the heat-softening adhesive resin layer. When the adhesive composition has a half-cut that is in the same direction, leakage of the adhesive composition from the half-cut can be suppressed in the process of processing the composite film.
　ハーフカットを有する複合フィルムを製造方法する場合には、特に限定されるものではないが、例えば、複合フィルムを製造した後に、レーザー等でハーフカットを作製する方法が挙げられる。 The method for manufacturing a composite film having half cuts is not particularly limited, but for example, a method of manufacturing half cuts with a laser or the like after manufacturing a composite film can be mentioned.
　あるいは、複合フィルムを生産する途中で、ハーフカットを作製し、ハーフカットを有する層とその他の層とを積層させて、複合フィルムとしてもよい。この場合には、例えば、ヒートシール層を含むシートに、ロータリーダイカッターを用いて、ヒートシール層の厚み方向に貫通させるカットを施し（ハーフカット作製工程）、次いで、ヒートシール層を含むシートに、基材層や熱軟化性接着樹脂層を積層する（積層工程）ことで、複合フィルムを製造することがきる。 Alternatively, half-cuts may be produced during the production of the composite film, and the layer having the half-cuts and other layers may be laminated to form a composite film. In this case, for example, the sheet containing the heat-sealing layer is cut using a rotary die cutter to penetrate the heat-sealing layer in the thickness direction (half-cut production step), and then the sheet containing the heat-sealing layer is cut. A composite film can be produced by laminating a substrate layer and a thermosoftening adhesive resin layer (lamination step).
　《複合フィルムの作用》
　以下に、図面を参照しながら、本発明の複合フィルムの作用について説明する。図２は、本発明の一実施形態に係る包装袋を示す図である。また、図３は、本発明の一実施形態に係る包装袋が、蒸気抜きするときの概略図である。 <<Action of Composite Film>>
The action of the composite film of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a packaging bag according to one embodiment of the present invention. Moreover, FIG. 3 is a schematic view of the packaging bag according to one embodiment of the present invention when steam is vented.
　本発明の複合フィルムを用いて形成される構造体は、特に限定されるものではない。本発明の複合フィルムは、最内層がヒートシール層となっているため、ヒートシール層を互いに熱融着させる、又はフランジを有する容器本体のフランジ部にヒートシール層を熱融着させる等により、様々な構造体を形成することができる。 The structure formed using the composite film of the present invention is not particularly limited. Since the innermost layer of the composite film of the present invention is a heat-sealing layer, the heat-sealing layers are heat-sealed to each other, or the heat-sealing layer is heat-sealed to the flange portion of a container body having a flange. Various structures can be formed.
　図２は、ヒートシール層を互いに熱融着させて形成した包装袋を示す図である。図２は、ハーフカットＣを有する本発明の複合フィルム１０の外周が互いに熱融着されて、シール部４が形成された包装袋１００となっている。 FIG. 2 is a diagram showing a packaging bag formed by heat-sealing heat seal layers to each other. FIG. 2 shows a packaging bag 100 in which the outer peripheries of the composite film 10 of the present invention having half cuts C are heat-sealed to each other to form a seal portion 4 .
　複合フィルム１０は、図１に示される、基材層１、熱軟化性接着樹脂層２、及びヒートシール層３からなる積層体であり、図２に示されるように、複合フィルム１０は、Ｘ方向及びＹ方向で形成されたＸ－Ｙ面に、各層が延在し、Ｚ方向（図示せず）が複合フィルム１０の厚み方向となる。すなわち、図２は、基材層１側から見た、包装袋１００の上面図である。 The composite film 10 is a laminate composed of the substrate layer 1, the thermosoftening adhesive resin layer 2, and the heat seal layer 3 shown in FIG. Each layer extends in the XY plane defined by the direction and the Y direction, and the Z direction (not shown) is the thickness direction of the composite film 10 . That is, FIG. 2 is a top view of the packaging bag 100 viewed from the base material layer 1 side.
　図２に示される包装袋１００を構成する複合フィルム１０において、ハーフカットＣは、断続的な直線で設けられており、包装袋１００のシール部４を、包装袋１００の内側から外側まで横断するように形成されている。 In the composite film 10 constituting the packaging bag 100 shown in FIG. 2, the half cuts C are provided in intermittent straight lines and cross the sealing portion 4 of the packaging bag 100 from the inside to the outside of the packaging bag 100. is formed as
　このような包装袋１００が加熱され、包装袋１００の内部に充填された内容物から蒸気が発生した場合には、図２に示されるように、発生した蒸気５は、シール部４のハーフカットＣが施された箇所から、包装袋１００の外部に排出される。 When such a packaging bag 100 is heated and steam is generated from the contents filled inside the packaging bag 100, as shown in FIG. It is discharged to the outside of the packaging bag 100 from the part where C is applied.
　ここで、蒸気５が、シール部４のハーフカットＣが施された箇所から、包装袋１００の外部に排出される作用について、図３を用いて説明する。 Here, the effect of discharging the steam 5 to the outside of the packaging bag 100 from the portion where the half cut C of the seal portion 4 is performed will be described with reference to FIG.
　図３は、複合フィルム１０のＺ方向（図示せず）を示した断面図である。そして、図３には、図１に示される複合フィルム１０から図２に示される包装袋１００が形成され、当該包装袋１００が加熱されて、包装袋１００の内容物から蒸気５が発生した場合に、蒸気５によって、複合フィルム１０の熱軟化性接着樹脂層２が軟化した状態が示されている。 FIG. 3 is a cross-sectional view showing the Z direction (not shown) of the composite film 10. FIG. In FIG. 3, the packaging bag 100 shown in FIG. 2 is formed from the composite film 10 shown in FIG. 1, and the packaging bag 100 is heated to generate steam 5 from the contents of the packaging bag 100. 2 shows a state in which the heat-softening adhesive resin layer 2 of the composite film 10 is softened by steam 5. FIG.
　包装袋１００の内部で発生した蒸気５は、複合フィルム１０のヒートシール層３に形成されたハーフカットＣから、複合フィルム１０の厚み方向（Ｚ方向）に入り込み、熱軟化性接着樹脂層２に到達すると、直接、熱軟化性接着樹脂層２に熱を与える。これにより、熱軟化性接着樹脂層２は軟化し、柔軟になる。 The steam 5 generated inside the packaging bag 100 enters the thickness direction (Z direction) of the composite film 10 from the half cut C formed in the heat seal layer 3 of the composite film 10, and reaches the thermosoftening adhesive resin layer 2. Upon reaching, heat is directly applied to the thermosoftening adhesive resin layer 2 . As a result, the thermosoftening adhesive resin layer 2 is softened and becomes flexible.
　包装袋１００の内部の圧力は、内容物から発生する蒸気の圧力によって高まり、上昇する。そして、図３に示されるように、内圧の上昇によって、軟化した熱軟化性接着樹脂層２とヒートシール層３との間で層間剥離が生じ、熱軟化性接着樹脂層２は、蒸気５の圧力によって包装袋１００の外側に持ち上がり、当該剥離部分に空間６が形成される。 The pressure inside the packaging bag 100 increases and rises due to the pressure of steam generated from the contents. Then, as shown in FIG. 3, due to the increase in internal pressure, delamination occurs between the softened heat-softening adhesive resin layer 2 and the heat seal layer 3, and the heat-softening adhesive resin layer 2 is separated from the steam 5. It is lifted outside the packaging bag 100 by the pressure, and a space 6 is formed in the peeled portion.
　そして、内容物から発生した蒸気５は、シール部４を横断するように形成されているハーフカットＣの領域に発現した空間６を通して、図２に示されるように、包装袋１００の内部から外部へと排出される。 Vapor 5 generated from the contents passes through the space 6 generated in the area of the half-cut C formed to traverse the sealing portion 4, and passes from the inside of the packaging bag 100 to the outside as shown in FIG. is discharged to
　《複合フィルムの用途》
　本発明の複合フィルムを用いて形成される構造体は、特に限定されるものではない。 《Uses of composite films》
The structure formed using the composite film of the present invention is not particularly limited.
　例えば、本発明の複合フィルムのヒートシール層を互いに熱融着することで、三方シール袋、四方シール袋、ガセット包装袋、ピロー包装袋、ゲーベルトップ型の有底容器、テトラクラシック（登録商標）、ブリックパック（登録商標）、チューブ容器等を形成することができる。また、ヒートシール層にチャックを設けて、チャック付き包装袋とすることもできる。 For example, by heat-sealing the heat seal layers of the composite film of the present invention to each other, a three-side seal bag, a four-side seal bag, a gusset packaging bag, a pillow packaging bag, a gobel top type bottomed container, Tetra Classic (registered trademark) , brick packs, tube containers, and the like. Alternatively, a zipper can be provided on the heat seal layer to form a packaging bag with a zipper.
　あるいは、例えば、本発明の複合フィルムから蓋材を形成し、容器本体に熱融着することで、開封可能な包装体とすることもできる。 Alternatively, for example, an openable package can be made by forming a lid material from the composite film of the present invention and heat-sealing it to the container body.
　以下に、本発明の複合フィルムを用いた包装袋、及び蓋材について説明する。 The packaging bag and lid material using the composite film of the present invention will be described below.
　（包装袋）
　包装袋は、本発明の複合フィルムのヒートシール層が互いに熱融着されて、シール部を形成することで作製することができる。 (packaging bag)
The packaging bag can be produced by heat-sealing the heat-seal layers of the composite film of the present invention to each other to form a sealed portion.
　このとき、複合フィルムにハーフカットを施し、ヒートシール層が互いに熱融着されたシール部を、包装袋の内側から外側に、ハーフカットが横断するように配置してもよい。 At this time, the composite film may be half-cut, and the seal portions in which the heat-seal layers are heat-sealed to each other may be arranged so that the half-cuts traverse from the inside to the outside of the packaging bag.
　ハーフカットがシール部を、包装袋の内側から外側に横断する形態とすれば、包装袋を加熱したときに、当該ハーフカット部分に、蒸気を通過させるための空間を形成することができる。そして、当該空間を通して、包装袋の内部で発生した蒸気を、包装袋の外部に排出することができる。 If the half-cut crosses the sealing portion from the inside to the outside of the packaging bag, a space for passing steam can be formed in the half-cut portion when the packaging bag is heated. Steam generated inside the packaging bag can be discharged to the outside of the packaging bag through the space.
　このような包装袋は、加熱がなされる包装袋に好適に用いることができ、例えば、電子レンジ用の包装袋として、大変に有益なものとなる。 Such a packaging bag can be suitably used as a packaging bag that is heated, and is very useful as a packaging bag for microwave ovens, for example.
　（蓋材）
　本発明の複合フィルムは、容器本体の上端開口部を密封するための蓋材ともなりうる。 (lid material)
The composite film of the present invention can also serve as a lid material for sealing the upper end opening of the container body.
　容器本体の密封は、容器の上端開口部を本発明の複合フィルムからなる蓋材が被覆するように、複合フィルムのヒートシール層を容器本体に熱融着させることで、開封可能な接合部を形成して行うことができる。 Sealing of the container body is performed by heat-sealing the heat-seal layer of the composite film to the container body so that the top opening of the container is covered with the lid material made of the composite film of the present invention, thereby forming an unsealable joint. can be formed.
　容器の上端開口部が、フランジを有する場合には、本発明の複合フィルムからなる蓋材のヒートシール層を、容器本体のフランジに熱融着させて、開封可能な接合部を形成することで、蓋付き容器を形成してもよい。 When the top opening of the container has a flange, the heat seal layer of the lid material made of the composite film of the present invention is heat-sealed to the flange of the container body to form an unsealable joint. , may form a lidded container.
　このとき、ヒートシール層がイージーピール性（易開封性）を有するものであれば、形成された密封容器は、開封容易な蓋付き容器となる。 At this time, if the heat seal layer has an easy peel property (easily open property), the formed sealed container becomes a lidded container that is easy to open.
　また、複合フィルムにハーフカットを施し、ハーフカットを、容器本体のフランジとヒートシール層とが熱融着された接合部に、容器本体の内側から外側に横断するように配置してもよい。 Alternatively, the composite film may be half-cut, and the half-cut may be arranged so as to traverse from the inside to the outside of the container body at the joint where the flange of the container body and the heat seal layer are heat-sealed.
　ハーフカットが接合部を、容器本体の内側から外側に横断する形態とすれば、密閉容器を加熱したときに、当該ハーフカット部分に、蒸気を通過させるための空間が形成される。そして、当該空間を通して、密閉容器の内部で発生した蒸気を、密閉容器の外部に排出することができる。 If the half-cut crosses the joint from the inside to the outside of the container body, a space for passing steam is formed in the half-cut portion when the closed container is heated. Steam generated inside the sealed container can be discharged to the outside of the sealed container through the space.
　このような蓋付き容器は、加熱がなされる蓋付き容器に好適に用いることができ、例えば、電子レンジ用の蓋付き容器として、大変に有益なものとなる。 Such a container with a lid can be suitably used as a container with a lid that is heated, and is very useful as a container with a lid for microwave ovens, for example.
　以下、実施例及び比較例等により、本発明を更に詳細に説明するが、本発明はこれらに限定されるものではない。 The present invention will be described in more detail below with reference to examples, comparative examples, etc., but the present invention is not limited to these.
　＜材料＞
　実施例及び比較例においては、層を構成する材料として、以下を準備した。 <Material>
In the examples and comparative examples, the following materials were prepared for the layers.
　（１）基材層
　　・ＰＥＴ＃１２：二軸延伸ＰＥＴフィルム（東洋紡エステル（登録商標）Ｅ５１００、東洋紡株式会社、厚み：１２μｍ）
　　・ＯＰＰ＃２０：二軸延伸ＰＰフィルム（パイレン（登録商標）Ｐ２１６１、東洋紡株式会社、厚み：２０μｍ）
　　・Ｎｙ＃１５：ナイロンフィルム（ボニール（登録商標）ＲＸ、興人フィルム＆ケミカルズ株式会社、厚み：１５μｍ） (1) Base layer PET #12: Biaxially stretched PET film (Toyobo Ester (registered trademark) E5100, Toyobo Co., Ltd., thickness: 12 μm)
・ OPP #20: Biaxially stretched PP film (Pyrene (registered trademark) P2161, Toyobo Co., Ltd., thickness: 20 μm)
・ Ny # 15: Nylon film (Bonil (registered trademark) RX, KOHJIN Film & Chemicals Co., Ltd., thickness: 15 μm)
　（２）熱軟化性接着樹脂層
　　・ＴＭ－３９６（主剤）／ＣＡＴ－２２Ｂ（硬化剤）（東洋モートン株式会社）
　　・エリーテル（登録商標）ＸＰ－１５８６（ユニチカ株式会社） (2) Heat-softening adhesive resin layer TM-396 (main agent) / CAT-22B (curing agent) (Toyo-Morton Co., Ltd.)
・ Elitel (registered trademark) XP-1586 (Unitika Ltd.)
　（３）ヒートシール層
　　・ＣＰＰ＃２０：無延伸ＰＰフィルム（パイレン（登録商標）Ｐ１１２８、東洋紡株式会社、厚み：２０μｍ）
　　・ＣＰＰ＃３０：無延伸ＰＰフィルム（パイレン（登録商標）Ｐ１１２８、東洋紡株式会社、厚み：３０μｍ）
　　・Ｅ１９０１Ｔ＃５０：積層ＰＰフィルム（ディファレン（登録商標）Ｅ１９０１Ｔ、ＤＩＣ株式会社、厚み：５０μｍ） (3) Heat seal layer CPP#20: unstretched PP film (Pyrene (registered trademark) P1128, Toyobo Co., Ltd., thickness: 20 μm)
・CPP #30: Non-stretched PP film (Pyrene (registered trademark) P1128, Toyobo Co., Ltd., thickness: 30 μm)
・ E1901T #50: Laminated PP film (Differene (registered trademark) E1901T, DIC Corporation, thickness: 50 μm)
　《実施例１～４、比較例１～６、参考例１》
　＜複合フィルムの製造＞
　表１又は表２に記載した材料を用いて、基材層となるフィルムと、ヒートシール層となるフィルムを、熱軟化性接着樹脂層を形成する接着剤組成物によって接着し、積層体を作製した。なお、接着剤組成物の塗工量は、それぞれ３．０ｇ／ｍ２とした。 <<Examples 1 to 4, Comparative Examples 1 to 6, Reference Example 1>>
<Production of composite film>
Using the materials listed in Table 1 or Table 2, a film serving as a base layer and a film serving as a heat seal layer are adhered with an adhesive composition forming a thermosoftening adhesive resin layer to produce a laminate. did. The coating amount of each adhesive composition was 3.0 g/m 2 .
　積層体におけるヒートシール層となるフィルムには、ヒートシール層の厚み方向に貫通させるカットを施し（ハーフカット作製工程）、次いで、ヒートシール層を含むシートに、基材層及び熱軟化性接着樹脂層を積層して、ハーフカットを有する複合フィルムを得た。 The film to be the heat-seal layer in the laminate is cut so as to penetrate in the thickness direction of the heat-seal layer (half-cut manufacturing step), and then the sheet including the heat-seal layer is coated with the base layer and the heat-softening adhesive resin. The layers were laminated to obtain a composite film with half cuts.
　＜ラミネート強度の測定＞
　実施例１～４、比較例１～６、及び参考例１で得られた複合フィルムを１５ｍｍ幅にカットし、基材層とヒートシール層との層間強度を、２５℃雰囲気下と７０℃雰囲気下にて測定した。なお、測定は、Ｔ字剥離にて、３００ｍｍ／ｍｉｎの条件で実施し、変位２０～５０ｍｍの区間平均を求めた。結果を表１又は表２に示す。なお、表において「材破」とは、ラミネート強度が高すぎて剥離の途中で材料が破壊し、測定不可であった状況を意味する。 <Measurement of lamination strength>
The composite films obtained in Examples 1 to 4, Comparative Examples 1 to 6, and Reference Example 1 were cut to a width of 15 mm, and the interlaminar strength between the base material layer and the heat seal layer was measured under an atmosphere of 25°C and an atmosphere of 70°C. Measured below. The measurement was performed under the condition of 300 mm/min with T-shaped peeling, and the section average of the displacement of 20 to 50 mm was obtained. The results are shown in Table 1 or Table 2. In the table, "material failure" means a situation in which the lamination strength was too high and the material was destroyed during peeling, making measurement impossible.
　＜パウチの作製＞
　実施例１～４、比較例１～６、及び参考例１で作製した複合フィルムを用いて、内寸１３０ｍｍ×１３５ｍｍのピロー袋を作製した。このとき、ピロー袋の内部に、水１０ｃｃを含浸させた紙ワイパー（キムワイプ（登録商標）、日本製紙クレシア製）を封入した。また、ハーフカットは、ピロー袋のシール部に、包装袋の内側から外側まで、シール部を横断するように配置した。なお、ピロー袋の作製条件は、インパルスシーラーにより、加熱０．９秒、冷却２．０秒とした。 <Preparation of pouch>
Using the composite films produced in Examples 1 to 4, Comparative Examples 1 to 6, and Reference Example 1, pillow bags with internal dimensions of 130 mm×135 mm were produced. At this time, a paper wiper (Kimwipe (registered trademark), Nippon Paper Crecia Co., Ltd.) impregnated with 10 cc of water was sealed inside the pillow bag. In addition, the half-cut was arranged in the sealed portion of the pillow bag so as to traverse the sealed portion from the inside to the outside of the packaging bag. The pillow bag was manufactured under the conditions of heating for 0.9 seconds and cooling for 2.0 seconds using an impulse sealer.
　＜パウチの蒸気の通過性評価＞
　作製したパウチに対して、電子レンジ（７００Ｗ）にて、６０秒間のレンジアップを実施した。その際、目視にて、ヒートシール部からパウチの内側の蒸気が排出されたか確認した。なお、それぞれのパウチについて、５回ずつのレンジアップを実施し、以下の基準で評価した。結果を表１又は表２に示す。
　　○：５回すべてにおいて、蒸気が排出された。
　　×：少なくとも１回、蒸気が排出されない場合があった。 <Evaluation of vapor permeability of pouch>
The prepared pouch was heated in a microwave oven (700 W) for 60 seconds. At that time, it was visually confirmed whether the steam inside the pouch was discharged from the heat-sealed portion. Each pouch was subjected to range-up five times and evaluated according to the following criteria. The results are shown in Table 1 or Table 2.
○: Vapor was discharged in all 5 times.
x: There was a case where steam was not discharged at least once.
　＜パウチのラミ浮き評価＞
　上記の要領で、それぞれ５個ずつのパウチを作製し、２５℃雰囲気下で１日静置した。静置後、目視にてラミ浮きの有無を確認し、以下の評価基準で評価した。結果を表１又は表２に示す。
　　〇：５個全てのパウチで、ラミ浮きはなかった。
　　△：１～３個のパウチに、ラミ浮きが見られた。
　　×：４～５個のパウチに、ラミ浮きが見られた。 <Pouch lamination evaluation>
Five pouches were prepared in the manner described above and allowed to stand in an atmosphere of 25° C. for one day. After standing, the presence or absence of lamination lift was visually confirmed and evaluated according to the following evaluation criteria. The results are shown in Table 1 or Table 2.
◯: No lamination occurred in all five pouches.
Δ: Lami lift was observed on 1 to 3 pouches.
x: Lami lift was observed on 4 to 5 pouches.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　《実施例５～９、比較例７》
　＜複合フィルムの製造＞
　表３に記載した材料を用いて、基材層となるフィルムと、ヒートシール層となるフィルムを、熱軟化性接着樹脂層を形成する接着剤組成物によって接着し、積層体を作製した。なお、接着剤組成物の塗工量は、表３に記載した量とした。 <<Examples 5 to 9, Comparative Example 7>>
<Production of composite film>
Using the materials listed in Table 3, a film serving as a substrate layer and a film serving as a heat seal layer were adhered with an adhesive composition forming a thermosoftening adhesive resin layer to prepare a laminate. The coating amount of the adhesive composition was the amount shown in Table 3.
　実施例１と同様に、積層体におけるヒートシール層となるフィルムには、ヒートシール層の厚み方向に貫通させるカットを施し（ハーフカット作製工程）、次いで、ヒートシール層を含むシートに、基材層及び熱軟化性接着樹脂層を積層して、ハーフカットを有する複合フィルムを得た。 In the same manner as in Example 1, the film to be the heat-seal layer in the laminate was cut so as to penetrate in the thickness direction of the heat-seal layer (half-cut production step), and then the sheet containing the heat-seal layer was coated with the base material. A composite film having a half cut was obtained by laminating the layer and the thermosoftening adhesive resin layer.
　＜ラミネート強度の測定＞
　実施例１と同様にして、基材層とヒートシール層との層間強度を測定した。結果を表３に示す。 <Measurement of lamination strength>
In the same manner as in Example 1, the interlaminar strength between the base material layer and the heat seal layer was measured. Table 3 shows the results.
　＜パウチの作製＞
　実施例１と同様にして、内寸１３０ｍｍ×１３５ｍｍのピロー袋を作製した。 <Preparation of pouch>
In the same manner as in Example 1, a pillow bag with internal dimensions of 130 mm×135 mm was produced.
　＜パウチの蒸気の通過性評価及びパウチのラミ浮き評価＞
　実施例１と同様にして、パウチの蒸気の通過性評価及びパウチのラミ浮き評価を実施した。結果を表３に示す。 <Evaluation of steam permeability of pouch and evaluation of pouch lamination>
In the same manner as in Example 1, evaluation of the vapor permeability of the pouch and evaluation of lamination floating of the pouch were carried out. Table 3 shows the results.
　＜ハーフカットからの接着剤の漏出評価＞
　実施例５～９、及び比較例７においては、複合フィルムの各原反を４０００ｍ巻きで作製し、エージングを実施後に取り出して、直ちに巻替えを実施した。巻替え時に、ロール等に漏出した接着剤が付着していないか確認し、以下の評価基準で評価した。結果を表３に示す。
　　〇：接着剤の漏出は見られなかった。
　　△：かすかに漏出（加工に問題を及ぼさない）
　　×：接着剤の漏出が見られた。 <Evaluation of leakage of adhesive from half cut>
In Examples 5 to 9 and Comparative Example 7, each original roll of the composite film was produced with a length of 4000 m, and after aging, it was taken out and immediately rewound. At the time of rewinding, it was checked whether the leaked adhesive adhered to the roll or the like, and evaluation was made according to the following evaluation criteria. Table 3 shows the results.
◯: No leakage of the adhesive was observed.
△: Slight leakage (does not affect processing)
x: Leakage of the adhesive was observed.
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
　１０　　複合フィルム
　１　　　基材層
　２　　　熱軟化性接着樹脂層
　３　　　ヒートシール層
　４　　　シール部
　５　　　蒸気
　６　　　空間
　１００　包装袋
　Ｃ　　　ハーフカット REFERENCE SIGNS LIST 10 Composite film 1 Base material layer 2 Thermosoftening adhesive resin layer 3 Heat seal layer 4 Seal part 5 Steam 6 Space 100 Packaging bag C Half cut

Claims (14)

  1. 　少なくとも、基材層と、熱軟化性接着樹脂層と、ヒートシール層と、がこの順で積層された複合フィルムであって、
    　前記熱軟化性接着樹脂層は、架橋構造を有する熱軟化性接着剤樹脂から構成されている、
    複合フィルム。     A composite film in which at least a substrate layer, a thermosoftening adhesive resin layer, and a heat seal layer are laminated in this order,
    The thermosoftening adhesive resin layer is composed of a thermosoftening adhesive resin having a crosslinked structure,
    composite film.
  2. 　前記熱軟化性接着剤樹脂は、主剤１質量部に対して硬化剤０．２質量部未満含む接着剤組成物から形成される、請求項１に記載の複合フィルム。 The composite film according to claim 1, wherein the thermosoftening adhesive resin is formed from an adhesive composition containing less than 0.2 parts by mass of a curing agent per 1 part by mass of a main agent.
  3. 　前記熱軟化性接着剤樹脂は、主剤１質量部に対して硬化剤を、０．１２５質量部を超え０．２質量部未満含む接着剤組成物から形成される、請求項１に記載の複合フィルム。 The composite according to claim 1, wherein the thermosoftening adhesive resin is formed from an adhesive composition containing more than 0.125 parts by mass and less than 0.2 parts by mass of a curing agent per 1 part by mass of a main agent. the film.
  4. 　前記熱軟化性接着樹脂層は、前記接着剤組成物の塗工量が２．５ｇ／ｍ２未満の層である、請求項２又は３に記載の複合フィルム。 The composite film according to claim 2 or 3, wherein the heat-softening adhesive resin layer is a layer having a coating amount of the adhesive composition of less than 2.5 g/ m2 .
  5. 　前記熱軟化性接着剤樹脂は、エーテル系樹脂である、請求項１～４のいずれか一項に記載の複合フィルム。 The composite film according to any one of claims 1 to 4, wherein the thermosoftening adhesive resin is an ether resin.
  6. 　前記基材層と前記ヒートシール層との間の２５℃におけるラミネート強度は、１．３Ｎ/１５ｍｍ以上であり、
    　前記基材層と前記ヒートシール層との間の７０℃におけるラミネート強度は、０．６Ｎ/１５ｍｍ以下である、
    請求項１～５のいずれか一項に記載の複合フィルム。     The laminate strength at 25° C. between the base material layer and the heat seal layer is 1.3 N/15 mm or more,
    The laminate strength at 70° C. between the base layer and the heat seal layer is 0.6 N/15 mm or less.
    The composite film according to any one of claims 1-5.
  7. 　前記複合フィルムは、前記ヒートシール層の側から施され、前記熱軟化性接着樹脂層に到達しているハーフカットを有する、請求項１～６のいずれか一項に記載の複合フィルム。 The composite film according to any one of claims 1 to 6, wherein the composite film has a half cut that is applied from the heat seal layer side and reaches the thermosoftening adhesive resin layer.
  8. 　前記ヒートシール層が互いに熱融着されて形成されたシール部を備える、請求項７に記載の複合フィルムから形成された包装袋であって、
    　前記ハーフカットは、前記包装袋の内側から外側まで、前記シール部を横断する、包装袋。     8. A packaging bag formed from the composite film according to claim 7, wherein the heat-seal layers are provided with a seal portion formed by heat-sealing each other,
    The packaging bag, wherein the half-cut crosses the sealing portion from the inside to the outside of the packaging bag.
  9. 　電子レンジ用である、請求項８に記載の包装袋。 The packaging bag according to claim 8, which is for a microwave oven.
  10. 　容器本体の上端開口部を密封するための、請求項７に記載の複合フィルムから形成された蓋材であって、
    　前記密封は、前記上端開口部を前記蓋材が被覆するように、前記ヒートシール層が前記容器本体に熱融着されて、開封可能な接合部を形成するものであり、
    　前記ハーフカットは、前記接合部において、前記容器本体の内側から外側まで横断するように配置されている、蓋材。     A lid material formed from the composite film according to claim 7 for sealing an upper end opening of a container body,
    The sealing is such that the heat seal layer is heat-sealed to the container body so that the upper end opening is covered with the lid material to form an unsealable joint,
    The lid member, wherein the half-cuts are arranged so as to traverse from the inside to the outside of the container body at the joint.
  11. 　電子レンジ用である、請求項１０に記載の蓋材。 The lid material according to claim 10, which is for a microwave oven.
  12. 　容器本体と、
    　前記容器本体の上端開口部を密封するための、請求項７に記載の複合フィルムから形成された蓋材と、
    を含む開封可能な蓋付き容器であって、
    　前記容器本体の前記上端開口部は、フランジを有し、
    　前記ヒートシール層が前記フランジに熱融着されて、開封可能な接合部を形成し、
    　前記ハーフカットは、前記容器本体の内側から外側まで、前記接合部を横断する、
    開封可能な蓋付き容器。     a container body;
    a lid material formed from the composite film according to claim 7 for sealing the upper end opening of the container body;
    An openable lidded container comprising
    The upper end opening of the container body has a flange,
    the heat-seal layer is heat-sealed to the flange to form an openable joint;
    The half-cut traverses the joint from the inside to the outside of the container body,
    A container with an openable lid.
  13. 　電子レンジ用である、請求項１２に記載の蓋付き容器。 The lidded container according to claim 12, which is for a microwave oven.
  14. 　請求項７に記載の複合フィルムの製造方法であって、
    　前記ヒートシール層を含むシートに、ロータリーダイカッターにより、前記ヒートシール層の厚み方向に貫通させるカットを施す、ハーフカット作製工程と、
    　前記ハーフカット作製工程の後に、前記ヒートシール層を含むシートに、前記基材層及び／又は前記熱軟化性接着樹脂層を積層する積層工程と、を備える、
    複合フィルムの製造方法。     A method for manufacturing the composite film according to claim 7,
    A half-cut production step of cutting the sheet including the heat seal layer with a rotary die cutter so as to penetrate in the thickness direction of the heat seal layer;
    A lamination step of laminating the base material layer and/or the thermosoftening adhesive resin layer on the sheet containing the heat seal layer after the half-cut production step,
    A method for manufacturing a composite film.
PCT/JP2022/016174 2021-04-28 2022-03-30 Composite film, packaging bag, lid member, container with lid, and manufacturing method of composite film WO2022230588A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012240734A (en) * 2011-05-23 2012-12-10 Hosokawa Yoko Co Ltd Package bag for microwave cooking
JP2017124859A (en) * 2016-01-15 2017-07-20 大日本印刷株式会社 Packaging material, packaging container or packaging bag using the same
JP2019034753A (en) * 2017-08-14 2019-03-07 共同印刷株式会社 Easily peelable packaging material for heating type instant food
WO2021024981A1 (en) * 2019-08-06 2021-02-11 凸版印刷株式会社 Curing agent, two-component adhesive, adhesive composition, cured product, laminate and method for producing same, packing material, and packed body
JP2022024359A (en) * 2020-07-17 2022-02-09 共同印刷株式会社 Composite film, packaging bag, lid material, container with lid, and manufacturing method of composite film

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012240734A (en) * 2011-05-23 2012-12-10 Hosokawa Yoko Co Ltd Package bag for microwave cooking
JP2017124859A (en) * 2016-01-15 2017-07-20 大日本印刷株式会社 Packaging material, packaging container or packaging bag using the same
JP2019034753A (en) * 2017-08-14 2019-03-07 共同印刷株式会社 Easily peelable packaging material for heating type instant food
WO2021024981A1 (en) * 2019-08-06 2021-02-11 凸版印刷株式会社 Curing agent, two-component adhesive, adhesive composition, cured product, laminate and method for producing same, packing material, and packed body
JP2022024359A (en) * 2020-07-17 2022-02-09 共同印刷株式会社 Composite film, packaging bag, lid material, container with lid, and manufacturing method of composite film

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