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WO2025126020A1 - Sealant film and laminate film - Google Patents

Sealant film and laminate film Download PDF

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Publication number
WO2025126020A1
WO2025126020A1 PCT/IB2024/062405 IB2024062405W WO2025126020A1 WO 2025126020 A1 WO2025126020 A1 WO 2025126020A1 IB 2024062405 W IB2024062405 W IB 2024062405W WO 2025126020 A1 WO2025126020 A1 WO 2025126020A1
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WO
WIPO (PCT)
Prior art keywords
sealant film
film
resin
sealant
layer
Prior art date
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Pending
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PCT/IB2024/062405
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French (fr)
Japanese (ja)
Inventor
桑原弘嗣
武田友和
帯金未来
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Zacros
Zacros Corp
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Zacros
Zacros Corp
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Publication of WO2025126020A1 publication Critical patent/WO2025126020A1/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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

Definitions

  • the present invention relates to a sealant film and a laminated film.
  • Patent Document 1 describes a manufacturing method in which a synthetic resin containing aluminum foil pieces is fed into an extruder, the aluminum foil is crushed and kneaded to form pellets, and the pellets are then removed from cooling water and dehydrated and dried to a moisture content of 0.1% or less.
  • Patent Document 2 describes a laminated film in which a recycled polyethylene layer is laminated with a linear low-density polyethylene layer.
  • Paragraph 0036 of Patent Document 1 describes the production of various molded products such as blocks, bricks, stakes, fences, boards, sheets, injection molded products, and multi-layer containers from the recycled pellets, but makes no mention of their use as sealant films for packaging bags and the like.
  • Paragraph 0044 of Patent Document 2 describes using a linear low-density polyethylene layer that does not contain recycled polyethylene as the innermost layer, and paragraph 0086 describes producing a synthetic resin product such as a package using a laminate film having a recycled polyethylene layer, but does not describe using it as a sealant film for packaging bags, etc.
  • Sealant films are laminated with other resin films, such as base films, to produce packaging bags, but before laminating with other resin films, the sealant film is handled as a single film. For this reason, further improvements are needed to use laminated films with recycled polyethylene layers as sealant films. When horizontally recycling from one packaging bag to another, it is difficult to remove impurities such as adhesives, inks, and additives, and improvements are needed to ensure that the film is strong enough to be used as a sealant film even if these are mixed in.
  • the present invention was made in consideration of the above circumstances, and aims to provide a sealant film that contains recycled materials yet is easy to handle, as well as a laminate film that contains the sealant film.
  • one aspect of the present invention includes the following aspects.
  • the first aspect is a sealant film containing recycled material, which uses as a raw material a laminate in which multiple resin layers consisting of only polyethylene resin films are laminated via adhesive layers, and the sealant film has a multi-layer structure of at least two layers, and at least one end surface in the thickness direction has a virgin resin layer that does not contain the recycled material.
  • the second aspect is the first aspect, in which the sealant film has a virgin resin layer that does not contain the recycled material on both end surfaces in the thickness direction.
  • the density of the virgin resin contained in the sealant film is 0.910 g/cm 3 or more and 0.930 g/cm 3 or less.
  • the fourth aspect is any one of the first to third aspects, in which the content ratio of the recycled material to the total weight of the sealant film is 50% by weight or less.
  • the fifth aspect is any one of the first to fourth aspects, in which the recycled material contains high-density polyethylene.
  • the sixth aspect is any one of the first to fifth aspects, in which the recycled material contains a printing ink component or a urethane adhesive.
  • the seventh aspect is any one of the first to sixth aspects, in which the total light transmittance of the sealant film is 65 to 90%.
  • the eighth aspect is a laminated film in which a base film is laminated to the sealant film of any one of the first to seventh aspects.
  • the present invention makes it possible to provide a sealant film and a laminate film that contain recycled materials and are easy to handle.
  • FIG. 2 is a cross-sectional view showing an example of the sealant film of the present embodiment.
  • FIG. 2 is a cross-sectional view showing an example of a laminate that is a raw material for recycled materials.
  • FIG. 2 is a cross-sectional view showing an example of a laminate film including the sealant film of the present embodiment.
  • the sealant film 10 of this embodiment has a multilayer structure of at least two layers.
  • Methods for producing the multilayer structure include multilayer inflation molding, multilayer T-die molding, dry lamination, extrusion lamination, etc.
  • the multilayer structure in the illustrated example includes terminal layers 11, 13 facing both end faces in the thickness direction, and an intermediate layer 12 laminated between the terminal layers 11, 13.
  • the multilayer structure of at least two layers may be a two-layer multilayer structure consisting of terminal layers 11, 13, or may be a three-layer or more multilayer structure including one or more intermediate layers 12.
  • the sealant film 10 contains recycled material made from polyethylene resin film, except for the end layers 11 and 13 on at least one side.
  • the recycled material is manufactured, for example, by using a laminate 20 as a raw material, in which multiple resin layers 21, 22, 23 made only of polyethylene resin film are laminated via adhesive layers 24, 25, as shown in FIG. 2.
  • the number of resin layers 21, 22, 23 is not particularly limited, and may be two layers or four layers or more, not limited to three layers as shown in the illustrated example.
  • At least one of the end layers 11, 13 is a virgin resin layer that does not contain the recycled material.
  • at least one of the end surfaces 14, 15 is formed from a virgin resin layer, which facilitates sanitary management of the surface that comes into contact with the contents, and also improves the sealing performance when heat-welding the sealant films 10 together. It is preferable that both end layers 11, 13 are virgin resin layers and that both end surfaces 14, 15 do not contain recycled material.
  • polyethylene-based resins examples include linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), medium-density polyethylene (MDPE), and high-density polyethylene (HDPE).
  • LLDPE linear low-density polyethylene
  • LDPE low-density polyethylene
  • MDPE medium-density polyethylene
  • HDPE high-density polyethylene
  • Polyethylene-based resins may be either homopolymers of ethylene or copolymers mainly composed of ethylene.
  • Monomers (comonomers) other than ethylene include one or more of ⁇ -olefins such as 1-butene, 1-hexene, and 1-octene, cyclic olefins such as norbornene, and vinyl monomers such as vinyl acetate, vinyl chloride, and acrylic acid.
  • ⁇ -olefins such as 1-butene, 1-hexene, and 1-octene
  • cyclic olefins such as norbornene
  • vinyl monomers such as vinyl acetate, vinyl chloride, and acrylic acid.
  • the proportion of ethylene in the constituent monomers of polyethylene resins is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight.
  • Ethylene or comonomers may be compounds derived from fossil resources such as petroleum, compounds derived from biomass such as plants, or compounds obtained by chemical recycling. Chemical recycling refers to the process of producing compounds such as monomers by chemical processing of the raw materials of recycled materials.
  • the resin contained in the polyethylene-based resin layer may be only a polyethylene-based resin, or may contain other resins.
  • the polyethylene-based resin layer is preferably composed of 80% by weight or more, 90% by weight or more, or 95% by weight or more of a polyethylene-based resin.
  • Each polyethylene-based resin layer may be composed of one type of polyethylene-based resin, or two or more types of polyethylene-based resin.
  • the polyethylene resin may contain additives other than the resin.
  • the additives are not particularly limited, but examples thereof include antioxidants, lubricants, antiblocking agents, flame retardants, UV absorbers, light stabilizers, antistatic agents, colorants, crosslinking agents, etc.
  • the additives may be components that are compatible with the resin, or components that are not compatible with the resin.
  • the virgin resin layer is a polyethylene-based resin layer made of virgin polyethylene-based resin.
  • Virgin polyethylene-based resin refers to resin that is used in products only after it has been industrially produced by polymerization of monomers, and in the following explanation, it may be simply referred to as "virgin resin.”
  • Virgin resin can contain monomers obtained by chemical recycling as described above.
  • Virgin resin can be easily controlled in terms of composition, degree of polymerization, density, melting point, etc., so that it has the desired physical properties. For this reason, virgin resin can be used stably, but compared to recycled materials, the process of monomer production, polymerization, etc. places a greater burden on the environment.
  • the resin layers 21, 22, and 23 are polyethylene-based resin layers made of polyethylene-based resin.
  • the polyethylene-based resin of the recycled material refers to a resin that is produced industrially by polymerization from monomers, and then recovered after being used in a product or without being used in a product, and reused through processing such as crushing and dissolving without being returned to monomer. In the following explanation, it may be simply referred to as "recycled material.”
  • Products using polyethylene resins include films, sheets, packaging bags, molded products, etc. Scraps of films and sheets, used packaging films, packaging bags, etc. are used as raw materials for recycled materials. Only a laminate in which multiple resin layers made of only polyethylene resin films are laminated via adhesive layers may be used as raw materials for recycled materials, or other raw materials may be used in part. Examples of the proportion of other raw materials include 20% by weight or less, 10% by weight or less, etc.
  • Recycled materials are subject to heat history during product processing before recycling, and are also subject to heat history again during collection, crushing, dissolution, product processing after recycling, and other processes.
  • recycled materials are subjected to mechanical, optical, chemical, and other stresses during their history before and after recycling. For this reason, recycled materials may have inferior performance to virgin resins, even when they are processed from raw materials with relatively uniform properties, such as scraps and unused waste materials.
  • recycled materials may be processed in a state where various raw materials are mixed together during recycling.
  • polyethylene resins with different compositions, degrees of polymerization, densities, melting points, etc. may not be sufficiently separated, and/or foreign matter such as additives, impurities, and deposits may not be sufficiently removed before processing. This may make it difficult to obtain stable performance, or foreign matter may affect the performance of the resin.
  • the raw material polyethylene resin film may contain a laminate containing relatively low density resins such as LDPE and LLDPE, and relatively high density resins such as HDPE and MDPE.
  • the density of the virgin resin contained in the sealant film 10 is preferably 0.910 g/cm 3 or more and 0.930 g/cm 3 or less. This can improve the processability of the recycled material. If the density of the virgin resin is too low, blocking may occur easily.
  • a resin with a relatively low density such as LDPE or LLDPE is preferable.
  • the content ratio of recycled material to the total weight of the sealant film 10 is preferably 50% by weight or less.
  • virgin resin which has physical properties suitable for a sealant
  • recycled material whose quality is difficult to adjust, it is possible to reduce the environmental burden while ensuring quality.
  • the content ratio of recycled material may have an upper or lower limit of at least one selected from 50% by weight, 40% by weight, 30% by weight, 20% by weight, 10% by weight, and 5% by weight.
  • the sealant film 10 From the viewpoint of quality control of the sealant film 10, it is preferable to use recycled materials with physical properties suitable for sealants, such as LDPE and LLDPE.
  • the raw materials for the recycled materials are limited to scraps of sealant materials, and it may be difficult to secure the required quantity. For this reason, it is preferable that the recycled material contains HDPE.
  • HDPE is suitable as a base film for polyethylene-based resin films, so a composite film containing a base film and a sealant film can be used as the raw material laminate 20.
  • the recycled material contains a printing ink component or a urethane adhesive.
  • the recycled material containing the printing ink component may be a material having a lower total light transmittance than virgin resin.
  • the total light transmittance of the sealant film 10 may be 90% or less.
  • the total light transmittance can be relatively high by having a virgin resin layer that does not contain recycled material.
  • the total light transmittance of the sealant film 10 may be 65% or more.
  • a sealant film containing recycled material has excellent light blocking and concealing properties due to its lower total light transmittance compared to a sealant film made only of virgin resin.
  • the printing ink components are useful for ensuring a display surface and improving design when commercializing polyethylene resin films, and the urethane adhesive is useful for bonding between the resin layers 21, 22, and 23. Therefore, a composite film including a printing layer (not shown) and adhesive layers 24 and 25 can be used as the raw material laminate 20.
  • the sealant film 10 can be laminated with a base film 17 to produce a laminate film 16. Since the sealant film 10 accounts for a large proportion of the laminate film 16, increasing the recycling rate of the sealant film 10 is advantageous for increasing the recycling rate of the laminate film 16.
  • the base film 17 is not particularly limited, but examples thereof include polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyester resins such as polyethylene terephthalate (PET), and polyamide resins such as nylon (Ny).
  • the base film 17 may be one layer or two or more layers.
  • the laminated film 16 may have at least one selected from a printed layer, an adhesive layer, a barrier resin layer such as ethylene-vinyl alcohol copolymer (EVOH), a metal vapor deposition layer such as aluminum, a metal foil such as aluminum foil, an inorganic vapor deposition layer such as silica or alumina, an extruded resin layer such as PE, etc.
  • a barrier resin layer such as ethylene-vinyl alcohol copolymer (EVOH)
  • a metal vapor deposition layer such as aluminum
  • a metal foil such as aluminum foil
  • an inorganic vapor deposition layer such as silica or alumina
  • an extruded resin layer such as PE, etc.
  • the sealant film 10 and the base film 17 may be bonded together with a urethane adhesive.
  • the laminated film 16 may be used to manufacture packaging containers such as packaging bags.
  • packaging bags include three-sided sealed bags, four-sided sealed bags, pillow bags, gusset bags, standing pouches, etc.
  • the dimensions of the packaging bag are not particularly limited, but for example, in the case of use as a refill container, it is preferable that the vertical height is about 100 to 500 mm, the horizontal width is about 70 to 300 mm, and the filling volume is about 100 cm3 to 5000 cm3 .
  • the packaging bag can be filled with a desired content and then sealed to obtain the desired packaged product (packaging bag containing the content).
  • the state of the content is not particularly limited, but may be fluids such as liquids, powders, or particles, or solids such as articles.
  • the type of content is not particularly limited, but may be detergents, medicines, cosmetics, pharmaceuticals, beverages, seasonings, inks, paints, fuels, etc.
  • the layer ratio is a relative weight ratio determined according to the product of the thickness and density of each layer.
  • the recycling rate is the weight ratio (wt%) of the recycled material used in each layer.
  • "R" in the layer structure represents a layer with a recycling rate greater than 0 wt%
  • V represents a virgin resin layer with a recycling rate of 0 wt%.
  • the recycled material used was a laminate consisting of an HDPE layer and an LLDPE layer laminated with a printing ink layer and a urethane adhesive layer in between, and polyethylene resin obtained by repelletization.
  • the virgin resin used was C6LLDPE, which is copolymerized with a comonomer having 6 carbon atoms.
  • the density of the virgin resin is shown in Table 1.
  • the evaluation results of the sealant film are shown in Table 2.
  • the evaluation method was as follows.
  • the recycling rate of the entire sealant film was calculated by the following formula using the layer ratio of each layer of the sealant film (A outer , A middle , A inner ) and the recycling rate (B outer , B middle , B inner ).
  • “Overall recycling rate” (A outside B outside + A inside B inside + A inside B inside ) / (A outside + A inside + A inside )
  • the processability was evaluated with respect to film-forming property and blocking according to the following criteria.
  • the film-forming property was rated as " ⁇ ” when the bubbles were stable, “ ⁇ ” when the bubbles were stable with some disturbance, and “ ⁇ ” when the bubbles were unstable.
  • the blocking was rated as " ⁇ ” when there was no sticking to the inner surface of the tube, “ ⁇ ” when there was some sticking to the inner surface of the tube but it was easy to peel off, and " ⁇ " when there was sticking to the inner surface of the tube and it could not be easily peeled off.
  • the Gelbo Flex test was performed by measuring the number of pinholes that occurred after bending the sealant film 500 or 1000 times using a BE-1005 Gelbo Flex Tester manufactured by Tester Sangyo Co., Ltd. In Table 2, "-" indicates that no measurement was performed.
  • Total light transmittance The total light transmittance was measured in accordance with JIS K7361 using NDH4000 manufactured by Nippon Denshoku Industries Co., Ltd.

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Abstract

The present invention provides a sealant film and a laminate film with excellent ease of handling while also containing a recycled material. More specifically, the present invention relates to: a sealant film 10 containing a recycled material using a laminate as a raw material, in which a plurality of resin layers consisting solely of a polyethylene resin film are laminated via an adhesive layer, the sealant film 10 having a multilayer structure of at least two layers, and the sealant film 10 having a virgin resin layer without the recycled material on at least one of end faces 14, 15 in the thickness direction; and a laminate film 16 in which a base material film 17 is laminated to the sealant film 10.

Description

シーラントフィルムおよび積層フィルムSealant and Laminating Films

本発明は、シーラントフィルムおよび積層フィルムに関する。 The present invention relates to a sealant film and a laminated film.

特許文献１には、アルミ箔片を含む合成樹脂を押出機に供給し、アルミ箔を破砕しつつ混練してペレットを造粒した後、冷却水から取り出したペレットを脱水、乾燥して含水率０．１％以下にする製造方法が記載されている。
　特許文献２には、リサイクルポリエチレン層が直鎖状低密度ポリエチレン層と積層された積層フィルムが記載されている。 Patent Document 1 describes a manufacturing method in which a synthetic resin containing aluminum foil pieces is fed into an extruder, the aluminum foil is crushed and kneaded to form pellets, and the pellets are then removed from cooling water and dehydrated and dried to a moisture content of 0.1% or less.
Patent Document 2 describes a laminated film in which a recycled polyethylene layer is laminated with a linear low-density polyethylene layer.

日本国特開２００９−０７３０２８号公報Japanese Patent Application Publication No. 2009-073028 日本国特開２０２３−０４０６６０号公報Japanese Patent Application Publication No. 2023-040660

特許文献１の段落００３６には、再生ペレットからブロック、レンガ、杭、柵、板材、シート、射出成形品、多層容器等の種々の成形品を製造することが記載されているが、包装袋等のシーラントフィルムに用いることは記載されていない。
　特許文献２の段落００４４には、リサイクルポリエチレンを含まない直鎖状低密度ポリエチレン層を最内層にすることが記載されており、段落００８６には、リサイクルポリエチレン層を有する積層フィルムを用いて、包装体等の合成樹脂製品を製造することが記載されているが、包装袋等のシーラントフィルムに用いることは記載されていない。 Paragraph 0036 of Patent Document 1 describes the production of various molded products such as blocks, bricks, stakes, fences, boards, sheets, injection molded products, and multi-layer containers from the recycled pellets, but makes no mention of their use as sealant films for packaging bags and the like.
Paragraph 0044 of Patent Document 2 describes using a linear low-density polyethylene layer that does not contain recycled polyethylene as the innermost layer, and paragraph 0086 describes producing a synthetic resin product such as a package using a laminate film having a recycled polyethylene layer, but does not describe using it as a sealant film for packaging bags, etc.

シーラントフィルムは、他の樹脂フィルムである基材フィルム等と積層されて包装袋等の製造に用いられるが、他の樹脂フィルムと積層する前には、シーラントフィルムが単体フィルムとして取り扱われる。このため、リサイクルポリエチレン層を有する積層フィルムをシーラントフィルムに用いるには、さらなる改善が必要とされる。包装袋から包装袋への水平リサイクルを行う際には、接着剤、インキ、および添加剤等の不純物の除去が難しく、それらが混入してもシーラントフィルムとして使用可能な強度にするための改善が必要とされる。 Sealant films are laminated with other resin films, such as base films, to produce packaging bags, but before laminating with other resin films, the sealant film is handled as a single film. For this reason, further improvements are needed to use laminated films with recycled polyethylene layers as sealant films. When horizontally recycling from one packaging bag to another, it is difficult to remove impurities such as adhesives, inks, and additives, and improvements are needed to ensure that the film is strong enough to be used as a sealant film even if these are mixed in.

本発明は、上記事情に鑑みてなされたものであり、リサイクル材を含みながら取り扱い性に優れたシーラントフィルム、並びに、当該シーラントフィルムを含む積層フィルムを提供することを課題とする。 The present invention was made in consideration of the above circumstances, and aims to provide a sealant film that contains recycled materials yet is easy to handle, as well as a laminate film that contains the sealant film.

上記の課題を解決するため、本発明の一態様は、以下の態様を包含する。 To solve the above problems, one aspect of the present invention includes the following aspects.

第１の態様は、ポリエチレン系樹脂フィルムのみからなる複数の樹脂層が接着層を介して積層された積層体を原材料として使用したリサイクル材を含むシーラントフィルムであって、前記シーラントフィルムが少なくとも２層以上の多層構造であり、厚さ方向の少なくとも片側の末端面には前記リサイクル材を含まないバージン樹脂層を有する。 The first aspect is a sealant film containing recycled material, which uses as a raw material a laminate in which multiple resin layers consisting of only polyethylene resin films are laminated via adhesive layers, and the sealant film has a multi-layer structure of at least two layers, and at least one end surface in the thickness direction has a virgin resin layer that does not contain the recycled material.

第２の態様は、第１の態様において、前記シーラントフィルムの厚さ方向の両方の末端面に前記リサイクル材を含まないバージン樹脂層を有する。 The second aspect is the first aspect, in which the sealant film has a virgin resin layer that does not contain the recycled material on both end surfaces in the thickness direction.

第３の態様は、第１または第２の態様において、前記シーラントフィルムに含まれるバージン樹脂の密度が０．９１０ｇ／ｃｍ３以上０．９３０ｇ／ｃｍ３以下である。 In a third aspect, in the first or second aspect, the density of the virgin resin contained in the sealant film is 0.910 g/cm 3 or more and 0.930 g/cm 3 or less.

第４の態様は、第１~３のいずれか１の態様において、前記シーラントフィルムの全重量に対する前記リサイクル材の含有比率が５０重量％以下である。 The fourth aspect is any one of the first to third aspects, in which the content ratio of the recycled material to the total weight of the sealant film is 50% by weight or less.

第５の態様は、第１~４のいずれか１の態様において、前記リサイクル材が高密度ポリエチレンを含む。 The fifth aspect is any one of the first to fourth aspects, in which the recycled material contains high-density polyethylene.

第６の態様は、第１~５のいずれか１の態様において、前記リサイクル材が印刷インキ成分またはウレタン系接着剤を含む。 The sixth aspect is any one of the first to fifth aspects, in which the recycled material contains a printing ink component or a urethane adhesive.

第７の態様は、第１~６のいずれか１の態様において、シーラントフィルムの全光線透過率が６５~９０％である。 The seventh aspect is any one of the first to sixth aspects, in which the total light transmittance of the sealant film is 65 to 90%.

第８の態様は、第１~７のいずれか１の態様のシーラントフィルムに基材フィルムが積層されてなる積層フィルムである。 The eighth aspect is a laminated film in which a base film is laminated to the sealant film of any one of the first to seventh aspects.

本発明によれば、リサイクル材を含みながら取り扱い性に優れたシーラントフィルムおよび積層フィルムを提供することができる。 The present invention makes it possible to provide a sealant film and a laminate film that contain recycled materials and are easy to handle.

本実施形態のシーラントフィルムの一例を示す断面図である。FIG. 2 is a cross-sectional view showing an example of the sealant film of the present embodiment. リサイクル材の原材料となる積層体の一例を示す断面図である。FIG. 2 is a cross-sectional view showing an example of a laminate that is a raw material for recycled materials. 本実施形態のシーラントフィルムを含む積層フィルムの一例を示す断面図である。FIG. 2 is a cross-sectional view showing an example of a laminate film including the sealant film of the present embodiment.

以下、好適な実施形態に基づいて、本発明を説明する。 The present invention will be described below based on a preferred embodiment.

図１に示すように、本実施形態のシーラントフィルム１０は、少なくとも２層以上の多層構造である。多層構造の製造方法としては、多層インフレーション成形、多層Ｔダイス成形、ドライラミネート、押出ラミネート等が挙げられる。 As shown in FIG. 1, the sealant film 10 of this embodiment has a multilayer structure of at least two layers. Methods for producing the multilayer structure include multilayer inflation molding, multilayer T-die molding, dry lamination, extrusion lamination, etc.

図示例の多層構造は、厚さ方向の両方の末端面にそれぞれ面する末端層１１，１３と、末端層１１，１３の間に積層される中間層１２とを含む。少なくとも２層以上の多層構造は、末端層１１，１３からなる２層の多層構造でもよく、中間層１２を１層または２層以上含む、３層以上の多層構造でもよい。 The multilayer structure in the illustrated example includes terminal layers 11, 13 facing both end faces in the thickness direction, and an intermediate layer 12 laminated between the terminal layers 11, 13. The multilayer structure of at least two layers may be a two-layer multilayer structure consisting of terminal layers 11, 13, or may be a three-layer or more multilayer structure including one or more intermediate layers 12.

シーラントフィルム１０は、少なくとも片側の末端層１１，１３を除いて、ポリエチレン系樹脂フィルムを原材料として使用したリサイクル材を含む。 The sealant film 10 contains recycled material made from polyethylene resin film, except for the end layers 11 and 13 on at least one side.

リサイクル材は、例えば、図２に示すように、ポリエチレン系樹脂フィルムのみからなる複数の樹脂層２１，２２，２３が接着層２４，２５を介して積層された積層体２０を原材料として使用して製造される。樹脂層２１，２２，２３の層数は特に限定されないが、図示例の３層に限らず、２層または４層以上でもよい。 The recycled material is manufactured, for example, by using a laminate 20 as a raw material, in which multiple resin layers 21, 22, 23 made only of polyethylene resin film are laminated via adhesive layers 24, 25, as shown in FIG. 2. The number of resin layers 21, 22, 23 is not particularly limited, and may be two layers or four layers or more, not limited to three layers as shown in the illustrated example.

少なくとも片側の末端層１１，１３は、前記リサイクル材を含まないバージン樹脂層である。これにより、少なくとも片側の末端面１４，１５がバージン樹脂層から形成されるので、内容物と接触する面の衛生管理が容易となり、また、シーラントフィルム１０同士を熱溶着するときのシール性を良好にすることができる。両方の末端層１１，１３をバージン樹脂層とし、両方の末端面１４，１５がリサイクル材を含まないことが好ましい。 At least one of the end layers 11, 13 is a virgin resin layer that does not contain the recycled material. As a result, at least one of the end surfaces 14, 15 is formed from a virgin resin layer, which facilitates sanitary management of the surface that comes into contact with the contents, and also improves the sealing performance when heat-welding the sealant films 10 together. It is preferable that both end layers 11, 13 are virgin resin layers and that both end surfaces 14, 15 do not contain recycled material.

ポリエチレン系樹脂としては、直鎖状低密度ポリエチレン（ＬＬＤＰＥ）、低密度ポリエチレン（ＬＤＰＥ）、中密度ポリエチレン（ＭＤＰＥ）、高密度ポリエチレン（ＨＤＰＥ）等が挙げられる。ポリエチレン系樹脂は、エチレンの単独重合体（ホモポリマー）でもよく、エチレンを主体とする共重合体（コポリマー）でもよい。 Examples of polyethylene-based resins include linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), medium-density polyethylene (MDPE), and high-density polyethylene (HDPE). Polyethylene-based resins may be either homopolymers of ethylene or copolymers mainly composed of ethylene.

エチレン以外のモノマー（コモノマー）としては、１−ブテン、１−ヘキセン、および１−オクテン等のα−オレフィン、ノルボルネン等の環状オレフィン、酢酸ビニル、塩化ビニル、およびアクリル酸等のビニル系モノマー等の１種または２種以上が挙げられる。ポリエチレン系樹脂が、酢酸ビニル等のエステル基を有するモノマーを共重合している場合は、エステル基の一部がケン化されて、ビニルアルコールを含む共重合体となっていてもよい。 Monomers (comonomers) other than ethylene include one or more of α-olefins such as 1-butene, 1-hexene, and 1-octene, cyclic olefins such as norbornene, and vinyl monomers such as vinyl acetate, vinyl chloride, and acrylic acid. When a polyethylene resin is copolymerized with a monomer having an ester group such as vinyl acetate, some of the ester groups may be saponified to form a copolymer containing vinyl alcohol.

ポリエチレン系樹脂の構成モノマーにおけるエチレンの割合は、５０重量％以上が好ましく、例えば、８０~１００重量％でもよい。エチレンまたはコモノマーは、石油等の化石資源に由来する化合物でもよく、植物等のバイオマスに由来する化合物でもよく、ケミカルリサイクルにより得られた化合物でもよい。ケミカルリサイクルは、リサイクル材の原材料の化学処理によってモノマー等の化合物を生成するプロセスを指す。 The proportion of ethylene in the constituent monomers of polyethylene resins is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight. Ethylene or comonomers may be compounds derived from fossil resources such as petroleum, compounds derived from biomass such as plants, or compounds obtained by chemical recycling. Chemical recycling refers to the process of producing compounds such as monomers by chemical processing of the raw materials of recycled materials.

ポリエチレン系樹脂層に含まれる樹脂は、ポリエチレン系樹脂のみでもよく、他の樹脂を含有してもよい。ポリエチレン系樹脂層は、８０重量％以上、９０重量％以上あるいは９５重量％以上がポリエチレン系樹脂から構成されることが好ましい。各ポリエチレン系樹脂層は、１種のポリエチレン系樹脂から構成されてもよく、２種以上のポリエチレン系樹脂から構成されてもよい。 The resin contained in the polyethylene-based resin layer may be only a polyethylene-based resin, or may contain other resins. The polyethylene-based resin layer is preferably composed of 80% by weight or more, 90% by weight or more, or 95% by weight or more of a polyethylene-based resin. Each polyethylene-based resin layer may be composed of one type of polyethylene-based resin, or two or more types of polyethylene-based resin.

ポリエチレン系樹脂は、樹脂以外の添加剤を含有してもよい。添加剤としては、特に限定されないが、例えば、酸化防止剤、滑剤、アンチブロッキング剤、難燃剤、紫外線吸収剤、光安定剤、帯電防止剤、着色剤、架橋剤等が挙げられる。添加剤は、樹脂に相溶する成分でもよく、樹脂に相溶しない成分でもよい。 The polyethylene resin may contain additives other than the resin. The additives are not particularly limited, but examples thereof include antioxidants, lubricants, antiblocking agents, flame retardants, UV absorbers, light stabilizers, antistatic agents, colorants, crosslinking agents, etc. The additives may be components that are compatible with the resin, or components that are not compatible with the resin.

バージン樹脂層は、バージンのポリエチレン系樹脂からなるポリエチレン系樹脂層である。バージンのポリエチレン系樹脂は、モノマーから工業的に重合して製造された後、初めて製品に使われる樹脂を指し、以下の説明では単に「バージン樹脂」という場合がある。バージン樹脂は、上述したケミカルリサイクルにより得られたモノマーを含むことができる。 The virgin resin layer is a polyethylene-based resin layer made of virgin polyethylene-based resin. Virgin polyethylene-based resin refers to resin that is used in products only after it has been industrially produced by polymerization of monomers, and in the following explanation, it may be simply referred to as "virgin resin." Virgin resin can contain monomers obtained by chemical recycling as described above.

バージン樹脂は、所望の物性を有するように、組成、重合度、密度、融点等を容易に制御することができる。このため、バージン樹脂は安定的に使用することが可能であるが、リサイクル材に比べて、モノマーの製造、重合等の過程で環境負荷が大きい。 Virgin resin can be easily controlled in terms of composition, degree of polymerization, density, melting point, etc., so that it has the desired physical properties. For this reason, virgin resin can be used stably, but compared to recycled materials, the process of monomer production, polymerization, etc. places a greater burden on the environment.

リサイクル材の原材料において、樹脂層２１，２２，２３は、ポリエチレン系樹脂からなるポリエチレン系樹脂層である。リサイクル材のポリエチレン系樹脂は、モノマーから工業的に重合して製造された後、製品に使われてから又は製品に使われることなく回収され、破砕溶解等の処理によって、モノマーに戻すことなく再利用される樹脂を指す。以下の説明では、単に「リサイクル材」という場合がある。 In the raw material of the recycled material, the resin layers 21, 22, and 23 are polyethylene-based resin layers made of polyethylene-based resin. The polyethylene-based resin of the recycled material refers to a resin that is produced industrially by polymerization from monomers, and then recovered after being used in a product or without being used in a product, and reused through processing such as crushing and dissolving without being returned to monomer. In the following explanation, it may be simply referred to as "recycled material."

ポリエチレン系樹脂を用いた製品としては、フィルム、シート、包装袋、成形品等が挙げられる。フィルム、シート等の端材、包装フィルム、包装袋の使用済み品等がリサイクル材の原材料として用いられる。ポリエチレン系樹脂フィルムのみからなる複数の樹脂層が接着層を介して積層された積層体のみをリサイクル材の原材料としてもよく、一部に他の原材料を用いてもよい。他の原材料の割合としては、例えば、２０重量％以下、１０重量％以下等が挙げられる。 Products using polyethylene resins include films, sheets, packaging bags, molded products, etc. Scraps of films and sheets, used packaging films, packaging bags, etc. are used as raw materials for recycled materials. Only a laminate in which multiple resin layers made of only polyethylene resin films are laminated via adhesive layers may be used as raw materials for recycled materials, or other raw materials may be used in part. Examples of the proportion of other raw materials include 20% by weight or less, 10% by weight or less, etc.

リサイクル材は、リサイクル前の製品加工等により熱履歴を受けるとともに、回収、破砕溶解、リサイクル後の製品加工等の処理において、再度の熱履歴を受ける。また、リサイクル前および後の経歴において、リサイクル材は機械的、光学的、化学的等の観点で負荷を受ける。このため、リサイクル材は、端材、未使用の廃材等の比較的に性質が揃った原材料から加工される場合でも、バージン樹脂より性能が劣る場合がある。 Recycled materials are subject to heat history during product processing before recycling, and are also subject to heat history again during collection, crushing, dissolution, product processing after recycling, and other processes. In addition, recycled materials are subjected to mechanical, optical, chemical, and other stresses during their history before and after recycling. For this reason, recycled materials may have inferior performance to virgin resins, even when they are processed from raw materials with relatively uniform properties, such as scraps and unused waste materials.

さらに、リサイクル材では、リサイクル時に種々の原材料が混在した状態で加工を受ける場合がある。例えば、組成、重合度、密度、融点等の異なるポリエチレン系樹脂が十分に分別されず、及び／又は、添加剤、不純物、付着物等の異物が十分に除去されないで加工される場合がある。このため、安定的な性能が得にくかったり、異物が樹脂の性能に影響を及ぼしたりする場合がある。 Furthermore, recycled materials may be processed in a state where various raw materials are mixed together during recycling. For example, polyethylene resins with different compositions, degrees of polymerization, densities, melting points, etc. may not be sufficiently separated, and/or foreign matter such as additives, impurities, and deposits may not be sufficiently removed before processing. This may make it difficult to obtain stable performance, or foreign matter may affect the performance of the resin.

リサイクル材の用途に応じて、原材料を選別することも可能ではあるが、原材料が複合素材である場合、選別、分別が困難な場合がある。例えば、原材料のポリエチレン系樹脂フィルムは、ＬＤＰＥ、ＬＬＤＰＥ等の比較的に密度が低い樹脂と、ＨＤＰＥ、ＭＤＰＥ等の比較的に密度が高い樹脂とを含む積層体を含む場合がある。 It is possible to select raw materials depending on the intended use of the recycled material, but when the raw materials are composite materials, sorting and separation can be difficult. For example, the raw material polyethylene resin film may contain a laminate containing relatively low density resins such as LDPE and LLDPE, and relatively high density resins such as HDPE and MDPE.

上述したように、ポリエチレン系樹脂フィルムのみからなる複数の樹脂層２１，２２，２３が接着層２４，２５を介して積層された積層体２０を原材料として使用した場合、樹脂層２１，２２，２３が異種のポリエチレン系樹脂層であっても、接着層２４，２５の剥離や樹脂層２１，２２，２３の分離は困難である。このため、リサイクル材の品質調整は容易でない。 As described above, when a laminate 20 in which multiple resin layers 21, 22, 23 made only of polyethylene-based resin films are laminated via adhesive layers 24, 25 is used as a raw material, it is difficult to peel off the adhesive layers 24, 25 or separate the resin layers 21, 22, 23, even if the resin layers 21, 22, 23 are different polyethylene-based resin layers. For this reason, it is not easy to adjust the quality of the recycled material.

シーラントフィルム１０に含まれるバージン樹脂の密度は、０．９１０ｇ／ｃｍ３以上０．９３０ｇ／ｃｍ３以下であることが好ましい。これにより、リサイクル材の加工適性を向上することができる。バージン樹脂の密度が低すぎると、ブロッキングしやすくなるおそれがある。シーラントフィルム１０に用いるバージン樹脂としては、ＬＤＰＥ、ＬＬＤＰＥ等の比較的に密度が低い樹脂が好ましい。 The density of the virgin resin contained in the sealant film 10 is preferably 0.910 g/cm 3 or more and 0.930 g/cm 3 or less. This can improve the processability of the recycled material. If the density of the virgin resin is too low, blocking may occur easily. As the virgin resin used in the sealant film 10, a resin with a relatively low density such as LDPE or LLDPE is preferable.

シーラントフィルム１０の全重量に対するリサイクル材の含有比率は、５０重量％以下であることが好ましい。シーラントに適した物性を有するバージン樹脂と、品質調整が難しいリサイクル材とを混合して用いることにより、環境負荷の削減および品質の確保を両立することができる。リサイクル材の含有比率は、５０重量％、４０重量％、３０重量％、２０重量％、１０重量％、および５重量％から選択される少なくとも１つを上限または下限としてもよい。 The content ratio of recycled material to the total weight of the sealant film 10 is preferably 50% by weight or less. By mixing virgin resin, which has physical properties suitable for a sealant, with recycled material, whose quality is difficult to adjust, it is possible to reduce the environmental burden while ensuring quality. The content ratio of recycled material may have an upper or lower limit of at least one selected from 50% by weight, 40% by weight, 30% by weight, 20% by weight, 10% by weight, and 5% by weight.

シーラントフィルム１０の品質調整の観点では、ＬＤＰＥ、ＬＬＤＰＥ等のシーラントに適した物性を有するリサイクル材を用いることが好ましい。しかし、リサイクル材の原材料がシーラント材料の端材等に制限され、数量の確保が難しい場合がある。このため、リサイクル材がＨＤＰＥを含むことが好ましい。 From the viewpoint of quality control of the sealant film 10, it is preferable to use recycled materials with physical properties suitable for sealants, such as LDPE and LLDPE. However, the raw materials for the recycled materials are limited to scraps of sealant materials, and it may be difficult to secure the required quantity. For this reason, it is preferable that the recycled material contains HDPE.

ＨＤＰＥは、ポリエチレン系樹脂フィルムの基材フィルムとして好適であるため、原材料の積層体２０として、基材フィルムとシーラントフィルムとを含む複合フィルムを用いることができる。 HDPE is suitable as a base film for polyethylene-based resin films, so a composite film containing a base film and a sealant film can be used as the raw material laminate 20.

シーラントフィルム１０の品質調整の観点では、印刷インキ成分、ウレタン系接着剤等の異種材料を十分に除去することが好ましい。しかし、リサイクル材の処理が複雑になり、価格が上昇するおそれがある。このため、リサイクル材が印刷インキ成分またはウレタン系接着剤を含むことが好ましい。印刷インキ成分を含むリサイクル材は、全光線透過率がバージン樹脂より低い材料であってもよい。例えば、シーラントフィルム１０の全光線透過率が、９０％以下であってもよい。しかし、リサイクル材のみからなるシーラントフィルムと比べると、リサイクル材を含まないバージン樹脂層を有することで、全光線透過率を比較的に高くすることができる。例えば、シーラントフィルム１０の全光線透過率が、６５％以上であってもよい。また、リサイクル材を含むシーラントフィルムは、バージン樹脂のみのシーラントフィルムと比較して全光線透過率が低いことで、遮光性や隠蔽性に優れる。 From the viewpoint of quality control of the sealant film 10, it is preferable to thoroughly remove foreign materials such as printing ink components and urethane adhesives. However, this may complicate the processing of the recycled material and increase the price. For this reason, it is preferable that the recycled material contains a printing ink component or a urethane adhesive. The recycled material containing the printing ink component may be a material having a lower total light transmittance than virgin resin. For example, the total light transmittance of the sealant film 10 may be 90% or less. However, compared to a sealant film made only of recycled material, the total light transmittance can be relatively high by having a virgin resin layer that does not contain recycled material. For example, the total light transmittance of the sealant film 10 may be 65% or more. In addition, a sealant film containing recycled material has excellent light blocking and concealing properties due to its lower total light transmittance compared to a sealant film made only of virgin resin.

印刷インキ成分は、ポリエチレン系樹脂フィルムの製品化に際して、表示面の確保や意匠性の向上に有用であり、ウレタン系接着剤は、樹脂層２１，２２，２３間の接着に有用である。このため、原材料の積層体２０として、印刷層（図示せず）と、接着層２４，２５とを含む複合フィルムを用いることができる。 The printing ink components are useful for ensuring a display surface and improving design when commercializing polyethylene resin films, and the urethane adhesive is useful for bonding between the resin layers 21, 22, and 23. Therefore, a composite film including a printing layer (not shown) and adhesive layers 24 and 25 can be used as the raw material laminate 20.

シーラントフィルム１０は、基材フィルム１７と積層して積層フィルム１６を製造するために用いることができる。シーラントフィルム１０は、積層フィルム１６に占める割合が大きいため、シーラントフィルム１０のリサイクル率を高めると、積層フィルム１６のリサイクル率を高めるのに有利である。 The sealant film 10 can be laminated with a base film 17 to produce a laminate film 16. Since the sealant film 10 accounts for a large proportion of the laminate film 16, increasing the recycling rate of the sealant film 10 is advantageous for increasing the recycling rate of the laminate film 16.

基材フィルム１７としては、特に限定されないが、ポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）等のポリオレフィン系樹脂、ポリエチレンテレフタレート（ＰＥＴ）等のポリエステル系樹脂、ナイロン（Ｎｙ）等のポリアミド系樹脂等が挙げられる。基材フィルム１７は、１層でも２層以上でもよい。また、その後のリサイクルを考えると、基材フィルム１７はＰＥ系樹脂であることが好ましい。 The base film 17 is not particularly limited, but examples thereof include polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyester resins such as polyethylene terephthalate (PET), and polyamide resins such as nylon (Ny). The base film 17 may be one layer or two or more layers. In addition, in consideration of subsequent recycling, it is preferable that the base film 17 be a PE resin.

特に図示しないが、積層フィルム１６が、印刷層、接着層、エチレン−ビニルアルコール共重合体（ＥＶＯＨ）等のバリア性樹脂層、アルミニウム等の金属蒸着層、アルミニウム箔等の金属箔、シリカやアルミナ等の無機蒸着層、ＰＥ等の押出樹脂層等から選択される少なくとも１つを有してもよい。シーラントフィルム１０と基材フィルム１７との間は、ウレタン系接着剤で接着してもよい。 Although not specifically shown, the laminated film 16 may have at least one selected from a printed layer, an adhesive layer, a barrier resin layer such as ethylene-vinyl alcohol copolymer (EVOH), a metal vapor deposition layer such as aluminum, a metal foil such as aluminum foil, an inorganic vapor deposition layer such as silica or alumina, an extruded resin layer such as PE, etc. The sealant film 10 and the base film 17 may be bonded together with a urethane adhesive.

積層フィルム１６は、包装袋等の包装容器の製造に用いてもよい。包装袋の具体例としては、三方シール袋、四方シール袋、ピロー袋、ガセット袋、スタンディングパウチ等が挙げられる。 The laminated film 16 may be used to manufacture packaging containers such as packaging bags. Specific examples of packaging bags include three-sided sealed bags, four-sided sealed bags, pillow bags, gusset bags, standing pouches, etc.

包装袋の寸法は、特に限定されるものではないが、例えば、詰め替え容器の用途の場合、上下方向の高さは１００~５００ｍｍ程度であり、左右方向の幅は７０~３００ｍｍ程度であり、充填量としては１００ｃｍ３~５０００ｃｍ３程度であることが好ましい。 The dimensions of the packaging bag are not particularly limited, but for example, in the case of use as a refill container, it is preferable that the vertical height is about 100 to 500 mm, the horizontal width is about 70 to 300 mm, and the filling volume is about 100 cm3 to 5000 cm3 .

包装袋は、所定の内容物を充填した状態で密封することにより、所望の包装製品（内容物入り包装袋）を得ることができる。内容物の状態としては、特に限定されないが、液体、粉体、粒体等の流体、あるいは物品等の固形物が挙げられる。内容物の種類としては、特に限定されないが、洗剤、薬剤、化粧品、医薬品、飲料、調味料、インキ、塗料、燃料等が挙げられる。 The packaging bag can be filled with a desired content and then sealed to obtain the desired packaged product (packaging bag containing the content). The state of the content is not particularly limited, but may be fluids such as liquids, powders, or particles, or solids such as articles. The type of content is not particularly limited, but may be detergents, medicines, cosmetics, pharmaceuticals, beverages, seasonings, inks, paints, fuels, etc.

以上、本発明を好適な実施形態に基づいて説明してきたが、本発明は上述の実施形態に限定されず、本発明の要旨を逸脱しない範囲で種々の改変が可能である。改変としては、構成要素の追加、置換、省略、その他の変更が挙げられる。 The present invention has been described above based on a preferred embodiment, but the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the present invention. Modifications include the addition, substitution, omission, and other changes of components.

以下、実施例をもって本発明を具体的に説明する。 The present invention will be explained in detail below with examples.

表１に示す層構成および層比率により、外（末端層１３）、中（中間層１２）、内（末端層１１）の３層を有するシーラントフィルム１０を多層インフレーションにより製造した。層比率は、各層の厚さと密度との積に応じて求められる相対的な重量比である。リサイクル率は、各層に用いられるリサイクル材の重量比（重量％）である。層構成の「Ｒ」は、リサイクル率が０重量％より大きい層を表し、「Ｖ」は、リサイクル率が０重量％のバージン樹脂層を表す。 A sealant film 10 having three layers, an outer layer (terminal layer 13), a middle layer (intermediate layer 12), and an inner layer (terminal layer 11), was manufactured by multi-layer inflation according to the layer structure and layer ratio shown in Table 1. The layer ratio is a relative weight ratio determined according to the product of the thickness and density of each layer. The recycling rate is the weight ratio (wt%) of the recycled material used in each layer. "R" in the layer structure represents a layer with a recycling rate greater than 0 wt%, and "V" represents a virgin resin layer with a recycling rate of 0 wt%.

リサイクル材としては、印刷インキ層およびウレタン系接着剤層を介して、ＨＤＰＥ層とＬＬＤＰＥ層とが積層された積層体を原材料として使用し、リペレットにより得られたポリエチレン系樹脂を用いた。 The recycled material used was a laminate consisting of an HDPE layer and an LLDPE layer laminated with a printing ink layer and a urethane adhesive layer in between, and polyethylene resin obtained by repelletization.

バージン樹脂としては、炭素数６のコモノマーを共重合したＣ６ＬＬＤＰＥを用いた。バージン樹脂の密度は表１に示すとおりである。 The virgin resin used was C6LLDPE, which is copolymerized with a comonomer having 6 carbon atoms. The density of the virgin resin is shown in Table 1.

Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001

シーラントフィルムの評価結果は表２に示す。評価方法は次のとおりである。 The evaluation results of the sealant film are shown in Table 2. The evaluation method was as follows.

（リサイクル率）
　シーラントフィルム全体のリサイクル率は、シーラントフィルムの各層の層比率（Ａ外、Ａ中、Ａ内）とリサイクル率（Ｂ外、Ｂ中、Ｂ内）とを用いて、次の式により算出した。
「全体のリサイクル率」＝（Ａ外Ｂ外＋Ａ中Ｂ中＋Ａ内Ｂ内）／（Ａ外＋Ａ中＋Ａ内） (Recycling rate)
The recycling rate of the entire sealant film was calculated by the following formula using the layer ratio of each layer of the sealant film (A outer , A middle , A inner ) and the recycling rate (B outer , B middle , B inner ).
"Overall recycling rate" = (A outside B outside + A inside B inside + A inside B inside ) / (A outside + A inside + A inside )

（加工適性）
　加工適性は、成膜性およびブロッキングについて、それぞれ次の基準で評価した。
　成膜性は、バブルが安定している場合を「○」、バブルの多少の乱れはあるが安定している場合を「△」、バブルが安定しない場合を「×」とした。
　ブロッキングは、チューブ内面の貼り付きが無い場合を「○」、チューブ内面に多少の貼り付きがあるが容易に剥がせる場合を「△」、チューブ内面に貼り付きがあり容易に剥がせない場合を「×」とした。 (Processability)
The processability was evaluated with respect to film-forming property and blocking according to the following criteria.
The film-forming property was rated as "◯" when the bubbles were stable, "Δ" when the bubbles were stable with some disturbance, and "×" when the bubbles were unstable.
The blocking was rated as "○" when there was no sticking to the inner surface of the tube, "△" when there was some sticking to the inner surface of the tube but it was easy to peel off, and "×" when there was sticking to the inner surface of the tube and it could not be easily peeled off.

（ダートインパクト試験）
　ダートインパクト試験は、ＪＩＳ　Ｋ７１２４−１　ステアケースＡ法に準拠した。シーラントフィルムに対して、所定の高さ０．６６ｍからダートを落下させ、衝撃破壊質量（ｇ）を測定した。衝撃破壊質量が１２００ｇ以上となる場合、１２００以上と記録した。 (Dirt impact test)
The dart impact test was performed in accordance with JIS K7124-1 Staircase A method. A dart was dropped onto the sealant film from a predetermined height of 0.66 m, and the impact breaking mass (g) was measured. When the impact breaking mass was 1200 g or more, it was recorded as 1200 or more.

（ゲルボフレックス試験）
　ゲルボフレックス試験は、テスター産業（株）製ＢＥ−１００５ゲルボフレックステスターを用いて、シーラントフィルムを５００回または１０００回屈曲させた後に発生したピンホールの数を計測して評価した。表２の「−」は未測定を表す。 (Gelboflex test)
The Gelbo Flex test was performed by measuring the number of pinholes that occurred after bending the sealant film 500 or 1000 times using a BE-1005 Gelbo Flex Tester manufactured by Tester Sangyo Co., Ltd. In Table 2, "-" indicates that no measurement was performed.

（全光線透過率）
　全光線透過率の測定は、ＪＩＳ　Ｋ７３６１に準拠した。日本電色工業（株）製ＮＤＨ４０００を用いて測定した。 (Total light transmittance)
The total light transmittance was measured in accordance with JIS K7361 using NDH4000 manufactured by Nippon Denshoku Industries Co., Ltd.

Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002

表２に示すように、実施例１~８のシーラントフィルムでは、少なくとも良好な結果が得られた。また、実施例４~８のシーラントフィルムでは、優良な結果が得られた。このことから、本発明によれば、成膜性および耐屈曲性が向上することが分かる。 As shown in Table 2, at least good results were obtained with the sealant films of Examples 1 to 8. Furthermore, excellent results were obtained with the sealant films of Examples 4 to 8. This shows that the present invention improves film-forming properties and flex resistance.

１０…シーラントフィルム、１１，１３…末端層、１２…中間層、１４，１５…末端面、１６…積層フィルム、１７…基材フィルム、２０…積層体、２１，２２，２３…樹脂層、２４，２５…接着層 10...sealant film, 11, 13...end layer, 12...middle layer, 14, 15...end surface, 16...laminated film, 17...substrate film, 20...laminated body, 21, 22, 23...resin layer, 24, 25...adhesive layer

Claims (8)

　ポリエチレン系樹脂フィルムのみからなる複数の樹脂層が接着層を介して積層された積層体を原材料として使用したリサイクル材を含むシーラントフィルムであって、
　前記シーラントフィルムが少なくとも２層以上の多層構造であり、厚さ方向の少なくとも片側の末端面には前記リサイクル材を含まないバージン樹脂層を有することを特徴とする、シーラントフィルム。 A sealant film containing recycled materials using as a raw material a laminate in which a plurality of resin layers made of only polyethylene-based resin films are laminated via adhesive layers,
The sealant film has a multi-layer structure of at least two layers, and has a virgin resin layer not containing the recycled material on at least one end surface in the thickness direction. 　前記シーラントフィルムの厚さ方向の両方の末端面に前記リサイクル材を含まないバージン樹脂層を有することを特徴とする、請求項１に記載のシーラントフィルム。 The sealant film according to claim 1, characterized in that it has a virgin resin layer that does not contain the recycled material on both end surfaces in the thickness direction of the sealant film. 　前記シーラントフィルムに含まれるバージン樹脂の密度が０．９１０ｇ／ｃｍ３以上０．９３０ｇ／ｃｍ３以下であることを特徴とする、請求項１または２に記載のシーラントフィルム。 3. The sealant film according to claim 1, wherein the density of the virgin resin contained in the sealant film is 0.910 g/ cm3 or more and 0.930 g/ cm3 or less. 　前記シーラントフィルムの全重量に対する前記リサイクル材の含有比率が５０重量％以下であることを特徴とする、請求項１~３のいずれか１項に記載のシーラントフィルム。 The sealant film according to any one of claims 1 to 3, characterized in that the content of the recycled material relative to the total weight of the sealant film is 50% by weight or less. 　前記リサイクル材が高密度ポリエチレンを含むことを特徴とする、請求項１~４のいずれか１項に記載のシーラントフィルム。 The sealant film according to any one of claims 1 to 4, characterized in that the recycled material contains high-density polyethylene. 　前記リサイクル材が印刷インキ成分またはウレタン系接着剤を含むことを特徴とする、請求項１~５のいずれか１項に記載のシーラントフィルム。 The sealant film according to any one of claims 1 to 5, characterized in that the recycled material contains a printing ink component or a urethane adhesive. 　前記シーラントフィルムの全光線透過率が６５~９０％であることを特徴とする、請求項１~６のいずれか１項に記載のシーラントフィルム。 The sealant film according to any one of claims 1 to 6, characterized in that the total light transmittance of the sealant film is 65 to 90%. 　請求項１~７のいずれか１項に記載のシーラントフィルムに基材フィルムが積層されてなる積層フィルム。 A laminated film comprising a base film laminated to the sealant film according to any one of claims 1 to 7.
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Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH079643A (en) * 1993-06-28 1995-01-13 Sumitomo Chem Co Ltd Multi-layer film for packaging
JPH0852781A (en) * 1994-04-28 1996-02-27 W R Grace & Co Multilayer polyolefin film containing reused polymer derivedfrom crosslinked film
JPH11501260A (en) * 1994-10-13 1999-02-02 ザ、プロクター、エンド、ギャンブル、カンパニー Multilayer material suitable for package manufacturing
JP2001122985A (en) * 1999-10-26 2001-05-08 Canon Inc Reproduced film and manufacturing method thereof
JP2001225428A (en) * 2000-02-15 2001-08-21 Japan Polyolefins Co Ltd Laminated sheet and method for producing the same
WO2022124229A1 (en) * 2020-12-11 2022-06-16 東洋製罐株式会社 Sealant film
US20220355565A1 (en) * 2020-01-30 2022-11-10 Uniqco-Ip Pty Ltd Packaging sheeting and a method of manufacturing packaging sheeting
WO2022238187A1 (en) * 2021-05-14 2022-11-17 Unilever Ip Holdings B.V. Multilayer film
JP2022548903A (en) * 2019-09-20 2022-11-22 ノヴァ ケミカルズ（アンテルナショナル）ソシエテ アノニム Stand-up pouch made from recycled polyethylene
JP2022552096A (en) * 2019-10-15 2022-12-15 ダウ グローバル テクノロジーズ エルエルシー Flexible pouch using post-consumer resin
WO2023028943A1 (en) * 2021-09-02 2023-03-09 Borealis Ag Polyethylene sealant film with low friction containing recycled polymer
JP2023040660A (en) * 2021-09-10 2023-03-23 藤森工業株式会社 Material-recycled pe-containing film and package including the same
JP2024068520A (en) * 2022-11-08 2024-05-20 花王株式会社 Pouch Container
WO2024181007A1 (en) * 2023-02-27 2024-09-06 東洋製罐株式会社 Sealant film
WO2024248005A1 (en) * 2023-05-29 2024-12-05 Ｔｏｐｐａｎホールディングス株式会社 Sealant film, multilayer body, packaging material, and packaging bag

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH079643A (en) * 1993-06-28 1995-01-13 Sumitomo Chem Co Ltd Multi-layer film for packaging
JPH0852781A (en) * 1994-04-28 1996-02-27 W R Grace & Co Multilayer polyolefin film containing reused polymer derivedfrom crosslinked film
JPH11501260A (en) * 1994-10-13 1999-02-02 ザ、プロクター、エンド、ギャンブル、カンパニー Multilayer material suitable for package manufacturing
JP2001122985A (en) * 1999-10-26 2001-05-08 Canon Inc Reproduced film and manufacturing method thereof
JP2001225428A (en) * 2000-02-15 2001-08-21 Japan Polyolefins Co Ltd Laminated sheet and method for producing the same
JP2022548903A (en) * 2019-09-20 2022-11-22 ノヴァ ケミカルズ（アンテルナショナル）ソシエテ アノニム Stand-up pouch made from recycled polyethylene
JP2022552096A (en) * 2019-10-15 2022-12-15 ダウ グローバル テクノロジーズ エルエルシー Flexible pouch using post-consumer resin
US20220355565A1 (en) * 2020-01-30 2022-11-10 Uniqco-Ip Pty Ltd Packaging sheeting and a method of manufacturing packaging sheeting
WO2022124229A1 (en) * 2020-12-11 2022-06-16 東洋製罐株式会社 Sealant film
WO2022238187A1 (en) * 2021-05-14 2022-11-17 Unilever Ip Holdings B.V. Multilayer film
WO2023028943A1 (en) * 2021-09-02 2023-03-09 Borealis Ag Polyethylene sealant film with low friction containing recycled polymer
JP2023040660A (en) * 2021-09-10 2023-03-23 藤森工業株式会社 Material-recycled pe-containing film and package including the same
JP2024068520A (en) * 2022-11-08 2024-05-20 花王株式会社 Pouch Container
WO2024181007A1 (en) * 2023-02-27 2024-09-06 東洋製罐株式会社 Sealant film
WO2024248005A1 (en) * 2023-05-29 2024-12-05 Ｔｏｐｐａｎホールディングス株式会社 Sealant film, multilayer body, packaging material, and packaging bag

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