WO2022230588A1 - Film composite, sac d'emballage, élément opercule, contenant avec opercule et procédé de fabrication dudit film composite - Google Patents

Film composite, sac d'emballage, élément opercule, contenant avec opercule et procédé de fabrication dudit film composite 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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Prior art keywords
layer
composite film
heat
adhesive resin
heat seal
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PCT/JP2022/016174
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English (en)
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/ja
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/fr

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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)
  • Food Science & Technology (AREA)
  • Laminated Bodies (AREA)

Abstract

Une composition adhésive d'une configuration spécifique est appliquée en guise de couche de résine adhésive ramollissant à la chaleur du film composite, qui est un matériau d'emballage. Plus particulièrement, le film composite 10 est formé par stratification au moins d'une couche de substrat 1, d'une couche de résine adhésive ramollissant à la chaleur 2 et d'une couche de thermoscellage 3, dans cet ordre, et la couche de résine adhésive ramolissant à la chaleur 2 est réalisée à partir d'une résine adhésive ramollissant à la chaleur qui forme une structure réticulée.
PCT/JP2022/016174 2021-04-28 2022-03-30 Film composite, sac d'emballage, élément opercule, contenant avec opercule et procédé de fabrication dudit film composite WO2022230588A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2021-076567 2021-04-28
JP2021076567 2021-04-28
JP2021-209875 2021-12-23
JP2021209875A JP2022170658A (ja) 2021-04-28 2021-12-23 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

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WO2022230588A1 true WO2022230588A1 (fr) 2022-11-03

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012240734A (ja) * 2011-05-23 2012-12-10 Hosokawa Yoko Co Ltd 電子レンジ調理用包装袋
JP2017124859A (ja) * 2016-01-15 2017-07-20 大日本印刷株式会社 包装材料、それを用いた包装容器または包装袋
JP2019034753A (ja) * 2017-08-14 2019-03-07 共同印刷株式会社 加熱式即席食品用易剥離性包装材
WO2021024981A1 (fr) * 2019-08-06 2021-02-11 凸版印刷株式会社 Agent de durcissement, adhésif à deux composants, composition adhésive, produit durci, stratifié et procédé de production associé, matériau d'emballage et corps emballé
JP2022024359A (ja) * 2020-07-17 2022-02-09 共同印刷株式会社 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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012240734A (ja) * 2011-05-23 2012-12-10 Hosokawa Yoko Co Ltd 電子レンジ調理用包装袋
JP2017124859A (ja) * 2016-01-15 2017-07-20 大日本印刷株式会社 包装材料、それを用いた包装容器または包装袋
JP2019034753A (ja) * 2017-08-14 2019-03-07 共同印刷株式会社 加熱式即席食品用易剥離性包装材
WO2021024981A1 (fr) * 2019-08-06 2021-02-11 凸版印刷株式会社 Agent de durcissement, adhésif à deux composants, composition adhésive, produit durci, stratifié et procédé de production associé, matériau d'emballage et corps emballé
JP2022024359A (ja) * 2020-07-17 2022-02-09 共同印刷株式会社 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

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