WO2021049385A1 - シート材容器 - Google Patents

シート材容器 Download PDF

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Publication number
WO2021049385A1
WO2021049385A1 PCT/JP2020/033206 JP2020033206W WO2021049385A1 WO 2021049385 A1 WO2021049385 A1 WO 2021049385A1 JP 2020033206 W JP2020033206 W JP 2020033206W WO 2021049385 A1 WO2021049385 A1 WO 2021049385A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
film
resin layer
sheet material
film layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/033206
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
大輔 児玉
貴博 大塚
山本　貴史
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kao Corp
Fuji Seal International Inc
Original Assignee
Kao Corp
Fuji Seal International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kao Corp, Fuji Seal International Inc filed Critical Kao Corp
Priority to EP20864033.4A priority Critical patent/EP4029802A4/en
Priority to US17/640,670 priority patent/US11713172B2/en
Priority to JP2021545245A priority patent/JPWO2021049385A1/ja
Publication of WO2021049385A1 publication Critical patent/WO2021049385A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Definitions

  • the present invention relates to a sheet material container made of a sheet material.
  • Patent Document 1 describes a sheet material container including a container body and an inner container covered by the container body, wherein the container body is inside a first film layer and the first film layer. A joint portion formed of a sheet material having an arranged second film layer and in which the layers of the first film layer and the second film layer are bonded, and the interlayer between the first film layer and the second film layer. Disclosed is a sheet material container having a sealing portion in which air is sealed between layers of the non-bonded film material.
  • a laminated film made of stretched nylon (or PET) / transparent vapor-deposited PET / stretched nylon / LLDPE is used as the first film layer and the second film layer.
  • stretched nylon or PET
  • transparent vapor-deposited PET or stretched nylon / LLDPE
  • the laminated film There is room for further improvement in suppressing delamination.
  • An object of the present invention is to provide a sheet material container having a container body in which an encapsulation portion is formed between the first film layer and the second film layer, in which delamination of the film layer is unlikely to occur. is there.
  • the sheet material container of the present invention includes a container main body and an inner container covered by the container main body and defining a storage space, and the container main body includes a first film layer and the first film layer.
  • a joint portion formed of a sheet material containing a second film layer arranged inside the film layer, and the sheet material of the container body is bonded between the layers of the first film layer and the second film layer.
  • a polyolefin resin layer / ethylene is provided between the first film layer and the second film layer so that a filler can be sealed, and the first film layer faces the sealing portion. -Has an extruded multilayer structure of vinyl alcohol copolymer resin layer.
  • the extruded multilayer structure portion of the first film layer has a polyolefin resin layer / ethylene-vinyl alcohol copolymer resin layer / polyolefin resin layer.
  • the extruded multilayer structure portion of the first film layer is formed by coextrusion.
  • the preferred sheet material container of the present invention has a polyolefin resin layer / ethylene-vinyl alcohol copolymer resin layer / polyolefin resin layer extruded multilayer structure portion on the side where the second film layer faces the encapsulation portion.
  • the polyolefin resin layer of the second film layer is a linear low-density polyethylene resin layer.
  • the polyolefin resin layer of the first film layer is a linear low-density polyethylene resin layer.
  • the first film layer has the extruded multilayer structure portion and the polyester resin layer laminated on the outside of the extruded multilayer structure portion, and the polyester resin layer is the said. It constitutes the outer surface of the container body.
  • the first film layer has an extruded multilayer structure portion and a stretched polyethylene resin layer laminated on the outside of the extruded multilayer structure portion, and the stretched polyethylene resin layer is formed. , Consists of the outer surface of the container body.
  • the stretched polyethylene resin layer is formed by biaxial stretching.
  • the polyolefin resin layer of the first film layer is a polyethylene resin layer, and the average molecular weight of the polyethylene resin used for the polyethylene resin layer and the average molecular weight of the polyethylene resin used for the stretched polyethylene resin layer are Is the same.
  • the first film layer is formed by melt-extruding a polyethylene resin between the extruded multilayer structure portion and the stretched polyethylene resin layer.
  • the inner container is formed of an inner container constituent sheet material to which peripheral portions are joined.
  • the inner container constituent sheet material is composed of a multilayer film having at least two kinds selected from a polyolefin resin layer, an ethylene-vinyl alcohol copolymer resin layer and a nylon resin layer. ..
  • the tensile elongation in the MD direction and / and the TD direction of the extruded multilayer structure portion of the first film layer is 300% or more and 900% or less.
  • the filler is sealed in the sealing portion.
  • the sheet material container of the present invention can be used stably for a long period of time because the film layer is less likely to be delaminated when the filler is sealed in the sealing portion.
  • FIG. 1 It is a perspective view of the sheet material container of 1st Embodiment of this invention, in which the filler is sealed in the sealing part. It is a rear view of the sheet material container. It is an end view along the line III-III of FIG. The end view is a view showing the shape of only the cut surface and not the shape on the back side of the cut surface. It is a front view of the sheet material container which attached the cap with a pump. It is sectional drawing along the VV line of FIG. It is a top view of the sheet material which constitutes the container body of a sheet material container. (A) is a plan view of the first film layer, and (b) is a plan view of the second film layer.
  • (A) is a plan view of the inner container constituent sheet material
  • (b) is a plan view of the container body sheet material with an inner container in which the inner container constituent sheet material is joined to the container body constituent sheet material.
  • (A) is a perspective view of the container body sheet material with an inner container bent in the process of manufacturing the sheet material container, and (b) is a reference side surface when the container body sheet material with an inner container is flattened. It is a figure. It is a front view of the sheet material container of 2nd Embodiment. It is a rear view of the sheet material container. It is a front view of the sheet material container of the 2nd Embodiment in which the filler is sealed in the sealing part.
  • the numerical range represented by "lower limit value XXX to upper limit value YYY” means a lower limit value XXX or more and an upper limit value YYY or less.
  • the sheet material container of the present embodiment includes a container main body and an inner container covered with the container main body and defining a storage space.
  • the container body is formed of a sheet material containing a first film layer and a second film layer arranged inside the first film layer.
  • the sheet material of the container body is a joint portion in which the layers of the first film layer and the second film layer are joined, and an encapsulation portion in which a filler can be sealed between the layers of the first film layer and the second film layer.
  • the present invention is characterized in that a sheet material container is formed using a sheet material containing a specific film layer. That is, the main feature of the present invention is that the first film layer has an extruded multilayer structure portion of a polyolefin resin layer / ethylene-vinyl alcohol copolymer resin layer on the side facing the encapsulation portion.
  • any structure can be adopted as the structure of the sheet material container including the container body and the inner container, except that the specific film layer is used.
  • the structure of the sheet material container having the conventionally known sealing portion as in Patent Document 1 may be adopted, or the structure of the sheet material container having the sealing portion developed after the present application may be adopted. It may be adopted.
  • the structure of the sheet material container disclosed in Patent Document 1 Patent No. 6186547) will be briefly described below.
  • the sheet material container 5 has a container main body 6 and an inner container 7 provided in the container main body 6.
  • the inner container 7 defines a storage space 53 for accommodating the contents.
  • the container body 6 is composed of a sheet material 3 (container body constituent sheet material 3) in which a plurality of film layers (for example, two film layers of a first film layer 1 and a second film layer 2) are laminated.
  • the inner container 7 may be composed of a sheet material composed of one film layer, or may be composed of a sheet material 71 (inner container constituent sheet material 71) in which a plurality of film layers are laminated.
  • the container body 6 includes a plurality of planar portions (for example, four planar portions of a first main surface portion 6a, a second main surface portion 6b, a bottom gusset portion 6c, and a top gusset portion 6d).
  • the first main surface portion 6a and the second main surface portion 6b are surrounded by an encapsulation portion 51 capable of encapsulating the filler. 1 to 3 show a state after the filler is sealed in the sealing portion 51, and the sealing portion 51 in which the filler is contained is swelled three-dimensionally.
  • the filler examples include a fluid (gas or liquid), a solid (for example, powder or granular material, resin pellets, etc.), or a semi-solid (for example, a foam material), and among them, a gas such as air is preferable. ..
  • a spout 61 for example, is attached to the gusset portion 6d, if necessary.
  • the inner container 7 is formed in a bag shape in the container body 6. However, the upper portion of the inner container 7 communicates with the opening portion of the spout 61, and the contained object can be taken in and out of the accommodating space 53 from the opening portion of the spout 61.
  • the contained objects stored in the accommodation space 53 are represented by dots.
  • FIG. 3 (b) shows a state in which the content of the container 4 is reduced after the container 4 of FIG. 3 (a) is poured out from the full state.
  • a cap 62 with a pump may be attached to the spout 61 after the container 4 is placed in the storage space 53 of the inner container 7.
  • the case is not limited to the case where the spout 61 is attached to the ceiling gusset portion 6d, and for example, a film valve or the like may be provided instead of the spout.
  • the type of the inclusion is not particularly limited, and may be a liquid (including a paste) or a solid (for example, granular, granular, or powdery). Specific examples of the contents include shampoo, conditioner, body soap, detergent, fabric softener, beverage, food and the like.
  • the container body 6 can stand on its own with the bottom gusset portion 6c as a grounding portion.
  • the container body 6 is not limited to a self-supporting form, and may be a form assuming that the container body 6 is laid down without being self-supporting.
  • the sheet material 3 (container body constituent sheet material 3) constituting the container body 6 is a non-bonded portion 31 in which the layers of the plurality of film layers are not bonded, and a bonded portion 32 in which the plurality of film layers are bonded to each other. And have.
  • a filler can be sealed in the non-joining portion 31. That is, in this embodiment, the non-joining portion 31 is an encapsulating portion 51 capable of encapsulating the filler.
  • the container body constituent sheet material 3 is composed of two film layers, a first film layer 1 and a second film layer 2.
  • FIG. 6 is a plan view of the container body constituent sheet material 3 in which the first film layer 1 and the second film layer 2 are laminated, and the container body constituent sheet material 3 is viewed from the second film layer side.
  • the sheet material container 5 can be obtained by bending and joining the peripheral portion 3a in a state where the inner container constituent sheet material 71 (not shown in FIG. 6) is overlapped with the container body constituent sheet material 3 shown in FIG. FIG. 1 is obtained by filling the sealing portion 51 of the sheet material container 5 (non-joining portion 31 of the container main body constituent sheet material 3) with a filler such as air from the introduction port 34 and then sealing the introduction port 34.
  • a container body 6 (sheet material container 5) is configured in which the filling material is filled in the sealing portion 51 and can stand on its own, as shown in FIG.
  • the peripheral portion 3a is joined by, for example, heat sealing.
  • the first film layer 1 constitutes the outer surface of the container body 6.
  • the second film layer 2 is laminated inside the first film layer 1.
  • the heat seal includes heat seal using a heated heat seal bar or a heated roll, heat seal using an ultrasonic seal, a high frequency seal, etc., and refers to all heat seals regardless of the means. ..
  • FIG. 7A is a plan view of the first film layer 1 constituting the container body constituent sheet material 3, and FIG. 7B is a second film layer 2 constituting the container body constituent sheet material 3. It is a plan view of.
  • the second film layer 2 is superposed on the first film layer 1, and the layers of the first film layer 1 and the second film layer 2 are bonded except for the non-bonded portion 31. There is.
  • the portion where the layers of the first film layer 1 and the second film layer 2 are bonded is the joint portion 32.
  • the first film layer 1 and the second film layer 2 have substantially the same shape and the same size in a plan view, for example.
  • a hole 33 penetrating the first film layer 1 and the second film layer 2 is formed in a portion of the container body constituent sheet material 3 that forms the top gusset portion 6d.
  • a spout 61 is inserted into the hole 33.
  • the spout 61 is shown by a two-dot chain line which is a virtual line.
  • the inner surface of the first film layer 1 is subjected to a non-bonding treatment.
  • innumerable dots are attached to the non-joined portions.
  • the non-bonding treated portion is formed.
  • the first film layer 1 and the second film layer 2 are not bonded, and the first film layer 1 and the second film layer 2 are bonded at a location other than that location.
  • the first film layer 1 and the second film layer 2 may be bonded via an adhesive, or by heat-sealing the innermost layer of the first film layer 1 and the outermost layer of the second film layer 2. It may be joined.
  • the innermost layer of the first film layer 1 and the outermost layer of the second film layer 2 are heat-sealed to form a joint portion 32 between the first film layer 1 and the second film layer 2.
  • the container body constituent sheet material 3 in which the joint portion 32 is formed so as to surround the non-joint portion 31 is obtained.
  • the first film layer is composed of a multilayer film including two or more resin layers.
  • first innermost layer the layer arranged on the innermost side of the resin layers constituting the first film layer
  • first outermost layer the layer arranged on the outermost side of the resin layers constituting the first film layer. It is called "the first outermost layer”.
  • the first film layer is a film layer constituting the outer surface of the container body, the inner surface of the first film layer (inner surface of the first innermost layer) faces the encapsulation portion (non-bonded portion). Since it can be bonded to the second film layer by heat sealing, the first innermost layer is composed of a polyolefin resin layer.
  • the polyolefin resin layer is made of a polyolefin having a heat-sealing property. Heat sealability refers to the property of being able to join by heat seal.
  • As the polyolefin resin layer having heat-sealing property it is preferable to use a polyolefin resin layer that has not been stretched.
  • the first film layer has an extruded multilayer structure portion of a polyolefin resin layer / ethylene-vinyl alcohol copolymer resin layer.
  • the polyolefin resin layer of the extruded multilayer structure constitutes the first innermost layer.
  • the first film layer is superposed on the second film layer so that the polyolefin resin layer (first innermost layer) faces the non-bonded portion.
  • the non-bonded portion is formed between the layers of the film layer, and a filler can be sealed between the layers of the film layer in the non-bonded portion. Therefore, in the film layer, the non-bonded portion and the enclosed portion can be substantially identified.
  • the extruded multilayer structure portion refers to a multilayer film structure composed of two or more resin layers, in which at least one of the resin layers is laminated on another resin layer by an extrusion molding method.
  • the extruded multilayer structure is composed of two or more resin layers, at least one of which is a solidified layer of the melt-extruded resin, and the resin layer composed of the solidified layer of the melt-extruded resin is another resin.
  • the stretching treatment may be either uniaxial stretching (stretching in the MD direction or TD direction) or biaxial stretching (stretching in both the MD direction and the TD direction), but is preferably biaxial stretching.
  • the co-extruded multilayer structure portion is conceptually included in the extruded multilayer structure portion.
  • the co-extruded multilayer structure portion refers to a multilayer film structure composed of two or more resin layers in which all the resin layers are laminated by an extrusion molding method (co-extrusion molding method). In the film layer formed by the extrusion molding method, adjacent resin layers are laminated and adhered to each other.
  • the co-extruded multilayer structure is composed of two or more resin layers, all the resin layers are independently composed of solidified layers of melt-extruded resin, and each resin layer composed of solidified layers of the melt-extruded resin is formed.
  • the extruded multilayer structure portion of the first film layer has a two-layer structure of a polyolefin resin layer (first innermost layer) / an ethylene-vinyl alcohol copolymer resin layer in order from the side facing the encapsulation portion.
  • first extruded multilayer structure portion The layers between the polyolefin resin layer and the ethylene-vinyl alcohol copolymer resin layer may be directly laminated and adhered, or the polyolefin resin layer and the ethylene-vinyl alcohol copolymer resin layer have adhesiveness. It may be laminated and bonded with an adhesive resin layer such as polyolefin interposed therebetween. By interposing such an adhesive resin layer, dissimilar materials can be firmly multi-layered by extrusion molding.
  • the adhesive resin layer is interposed between layers by extrusion molding.
  • the first extruded multilayer structure portion may have three or more layers, provided that it has the two-layer structure.
  • the first extruded structure portion has a two-kind two-layer structure of a polyolefin resin layer (first innermost layer) / ethylene-vinyl alcohol copolymer resin layer in order from the side facing the ⁇ 1A> encapsulation portion, ⁇ 1B>.
  • a two-kind, three-layer structure consisting of a polyolefin resin layer (first innermost layer) / ethylene-vinyl alcohol copolymer resin layer / polyolefin resin layer in order from the side facing the encapsulation portion, and ⁇ 1C> in order from the side facing the encapsulation portion.
  • each first extruded multilayer structure portion may be independently laminated with at least one resin layer on another resin layer by extrusion molding.
  • all the resin layers are laminated by coextrusion molding. It is preferable that all the resin layers obtained by this coextrusion molding are not stretch-treated.
  • the first extruded multilayer structure portion is preferably ⁇ 1A> or ⁇ 1B>. Further, in the first extruded multilayer structure portion of ⁇ 1A>, it is preferable that the polyolefin resin layer and the ethylene-vinyl alcohol copolymer resin layer are coextruded films, respectively, and further, a polyolefin resin. It is more preferable that the layer, the adhesive resin layer and the ethylene-vinyl alcohol copolymer resin layer are coextruded films, respectively.
  • the first extruded multilayer structure portion of ⁇ 1B> is a film obtained by extruding a polyolefin resin layer onto a co-extruded film in which a polyolefin resin layer and an ethylene-vinyl alcohol copolymer resin layer are respectively extruded.
  • it may be a co-extruded film in which the polyolefin resin layer, the ethylene-vinyl alcohol copolymer resin layer and the polyolefin resin layer are each extruded and molded.
  • the first extruded multilayer structure portion of ⁇ 1B> is a co-extruded film in which a polyolefin resin layer, an ethylene-vinyl alcohol copolymer resin layer and a polyolefin resin layer are respectively extruded, and more preferably, a polyolefin.
  • This is a co-extruded film in which a resin layer, an adhesive resin layer, an ethylene-vinyl alcohol copolymer resin layer, an adhesive resin layer, and a polyolefin resin layer are each extruded.
  • the first film layer is a resin layer constituting the first outermost layer (the outermost layer of the first film layer) on the outside of the first extruded multilayer structure portion, and is a heat-resistant resin layer. It is preferable that they are laminated.
  • the heat-resistant resin layer include a polyester resin layer, a nylon resin layer, and a stretched polyolefin resin layer.
  • a polyester resin layer or a stretched polyolefin resin layer is preferably used, and a biaxially stretched polyethylene terephthalate film is more preferable. Alternatively, a biaxially stretched polyolefin film is used.
  • the stretched polyolefin resin layer such as the stretched polyethylene resin layer is crystallized by orientation, it has heat resistance that can withstand heating during heat sealing as compared with the unstretched polyolefin resin layer.
  • a preferred example of the stretched polyolefin resin layer is a stretched polyethylene resin layer.
  • examples of polyethylene include high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene.
  • the stretched polyethylene resin layer may be uniaxially stretched or biaxially stretched, but from the viewpoint of strength, biaxially stretched one is preferable.
  • the draw ratio is preferably 200% or more and 800% or less, and more preferably 300% or more and 600% or less. By setting the draw ratio within this range, uneven thickness of the resin layer is unlikely to occur, and breakage during film formation can be prevented.
  • the heat-resistant resin layer constituting the first outermost layer may be a single layer or may have a multi-layer structure of two or more layers. In the case of two layers, a biaxially stretched polyethylene terephthalate film and a biaxially stretched nylon film may be laminated.
  • the heat-resistant resin layer may be one in which an inorganic vapor deposition film such as a metal vapor deposition film or a silica vapor deposition film is laminated.
  • the heat-resistant resin layer is a polyester resin layer on which a silica-deposited film is laminated (a polyethylene terephthalate film on which a silica-deposited film is laminated, preferably a biaxially stretched polyethylene terephthalate film on which a silica-deposited film is laminated). Used. When a biaxially stretched polyethylene terephthalate film and / or a biaxially stretched nylon film is used as the outermost resin layer, the films are usually laminated via an adhesive, as will be described later.
  • This heat-resistant resin layer may be laminated on the outer surface of the first extruded multilayer structure portion via an adhesive, or may be laminated on the outer surface of the first extruded multilayer structure portion by extrusion molding. Good.
  • an adhesive for laminating which will be described later, is usually used.
  • the heat-resistant resin layer and the outer surface of the first extruded multilayer structure portion are directly laminated and bonded. Alternatively, it may be laminated via a binder-like resin layer.
  • the adhesiveness to the polyolefin resin layer of the first extruded multilayer structure portion may be poor.
  • a resin layer serving as a binder for example, a polyethylene resin layer
  • a first film layer composed of a binder resin layer / a first extruded multilayer structure portion.
  • a design printing layer is provided on the first film layer forming the outer surface of the container body, if necessary.
  • the design print layer may be provided so that the design can be seen from the outside of the container body.
  • the design print layer is provided on the outer surface and / and the inner surface of the first outermost layer (for example, the resin layer having heat resistance). From the viewpoint of preventing scratches, the design print layer is preferably provided on the inner surface of the first outermost layer.
  • a transparent first outermost layer is used.
  • the design print layer is provided by printing a known color ink on the first outermost layer or the like.
  • FIG. 8 shows some examples of layer configurations of the first film layer.
  • the first film layer 1 of FIG. 8A is a polyolefin resin layer 11 (first innermost layer) / adhesive resin layer / ethylene-vinyl alcohol copolymer resin layer in order from the side (inside) facing the encapsulation portion. It is composed of 12 / adhesive resin layer / polyolefin resin layer 13 / adhesive layer 14 / design printing layer 15 / polyester resin layer 16 (first outermost layer). In FIGS. 8 to 10, the adhesive resin layer is not shown.
  • 8B is a polyolefin resin layer 11 (first innermost layer) / adhesive resin layer / ethylene-vinyl alcohol copolymer resin layer 12 in order from the side (inside) facing the encapsulation portion. / Adhesive layer 14 / Design printing layer 15 / Polyester resin layer 16 (first outermost layer).
  • the first extruded multilayer structure composed of the polyolefin resin layer 11 / adhesive resin layer / ethylene-vinyl alcohol copolymer resin layer 12 / adhesive resin layer / polyolefin resin layer 13 in FIG. 8A is at least one resin.
  • the layers are laminated by extrusion molding. For example, after producing an ethylene-vinyl alcohol copolymer film (ethylene-vinyl alcohol copolymer resin layer), the adhesive resin and polyolefin are melt-extruded from both sides of the film to form a film.
  • the first extruded multilayer structure portion is obtained.
  • At least one resin layer is laminated by extrusion molding in the first extruded multilayer structure portion of the polyolefin resin layer 11 / adhesive resin layer / ethylene-vinyl alcohol copolymer resin layer 12 of FIG. 8 (b).
  • the adhesive resin and polyolefin are melt-extruded from one side of the film to form a film.
  • the first extruded multilayer structure portion is obtained.
  • Each of the first extruded multilayer structures of FIGS. 8A and 8B is preferably formed by coextrusion molding.
  • the first extruded multilayer structure portion of FIG. 8A is obtained by melt-extruding polyolefin, adhesive resin, ethylene-vinyl alcohol copolymer, adhesive resin, and polyolefin, respectively, to form a film. ..
  • the thickness of the polyolefin resin layers 11 and 13 of the first extruded multilayer structure portion is not particularly limited, and is, for example, 10 ⁇ m to 150 ⁇ m.
  • the polyolefin resin layer 11 constituting the innermost layer of the first film layer 1 is a heat-sealed layer, it is preferably relatively thick.
  • the thickness of the polyolefin resin layer 11 constituting the first innermost layer is 20 ⁇ m to 150 ⁇ m.
  • the thickness of the ethylene-vinyl alcohol copolymer resin layer 12 of the first film layer 1 is not particularly limited, and is, for example, 4 ⁇ m to 40 ⁇ m.
  • the thickness of the adhesive resin layer of the first film layer 1 is not particularly limited, and is, for example, 3 ⁇ m to 10 ⁇ m.
  • the adhesive layer 14 is formed using a laminating adhesive.
  • the adhesive for laminating include a dry laminating adhesive, a solvent-free laminating adhesive, and a wet laminating adhesive.
  • the dry laminate adhesive is a solvent-volatile type adhesive containing an organic solvent.
  • the solvent-free laminate adhesive is an adhesive that does not contain an organic solvent and does not require a drying step.
  • the wet laminate adhesive is a dry type adhesive containing an aqueous solvent.
  • the thickness of the adhesive layer 14 is not particularly limited, and is, for example, 2 ⁇ m to 30 ⁇ m. In FIG. 8, the thickness of the polyester resin layer 16 is not particularly limited, and is, for example, 8 ⁇ m to 40 ⁇ m.
  • a laminating adhesive is applied to at least one of a first extruded multilayer structure (extruded multilayer film, preferably a co-extruded multilayer film) and a polyester resin layer (biaxially stretched polyethylene terephthalate film). It is obtained by coating and laminating the first extruded multilayer structure portion and the polyester resin layer.
  • the polyester resin layer 16 and the first extruded multilayer structure portion are laminated and adhered using the adhesive layer 14, but instead of the adhesive layer 14, a resin layer serving as a binder (for example, a polyethylene resin layer) is used. Etc.) may be laminated between the polyester resin layer and the first extruded multilayer structure portion to form a first film layer composed of a polyester resin layer / extruded binder resin layer / first extruded multilayer structure portion.
  • the second film layer is composed of a multilayer film including two or more resin layers.
  • the outermost layer of the resin layers constituting the second film layer is referred to as the "second outermost layer”
  • the innermost layer of the resin layers constituting the second film layer is referred to as "the second outermost layer”. It is called “the second innermost layer”. Since the second film layer is laminated inside the first film layer, the outer surface of the second film layer (the outer surface of the second outermost layer) faces the encapsulation portion.
  • the second outermost layer is preferably composed of a polyolefin resin layer because it can be bonded to the first film layer by heat sealing.
  • the polyolefin resin layer is made of a polyolefin having a heat-sealing property.
  • the polyolefin resin layer having heat-sealing property is preferably a polyolefin resin layer that has not been stretched. Further, in order to impart gas barrier properties to the second film layer, it is preferable that the second film layer contains an ethylene-vinyl alcohol copolymer resin layer.
  • the preferred second film layer has a layer structure, provided that it has a polyolefin resin layer as the second outermost layer and an ethylene-vinyl alcohol copolymer resin layer as a layer other than the second outermost layer.
  • the second film layer may have a two-layer structure consisting of only the polyolefin resin layer and the ethylene-vinyl alcohol copolymer resin layer, or may have a multilayer structure having a resin layer in addition to the two layers.
  • the resin layer other than the two layers include a polyolefin resin layer, a polyester resin layer, a nylon resin layer, and the like, which are different from the two layers.
  • the second film layer may include an extruded multilayer structure portion, or all the resin layers may be laminated and bonded via an adhesive.
  • the second film layer has an extruded multilayer structure including a polyolefin resin layer (second outermost layer) / ethylene-vinyl alcohol copolymer resin layer.
  • the extruded multilayer structure portion of the second film layer is referred to as a “second extruded multilayer structure portion”.
  • the layers between the polyolefin resin layer and the ethylene-vinyl alcohol copolymer resin layer may be directly laminated and adhered, or the polyolefin resin layer and the ethylene-vinyl alcohol copolymer resin layer have adhesiveness.
  • an adhesive resin layer such as polyolefin interposed therebetween.
  • an adhesive resin layer such as polyolefin interposed therebetween.
  • the second extruded multilayer structure portion may have three or more layers, provided that it has the two-layer structure.
  • the second extruded structure portion has a two-kind two-layer structure of a polyolefin resin layer (second outermost layer) / ethylene-vinyl alcohol copolymer resin layer in order from the side facing the ⁇ 2A> encapsulation portion, ⁇ 2B>.
  • a two-kind three-layer structure consisting of a polyolefin resin layer (second outermost layer) / ethylene-vinyl alcohol copolymer resin layer / polyolefin resin layer in order from the side facing the encapsulation portion, and in order from the side facing the encapsulation portion ⁇ 2C> , Polyethylene resin layer (second outermost layer) / ethylene-vinyl alcohol copolymer resin layer / polyolefin resin layer / polyester resin layer, 3 types, 4 layers structure, ⁇ 2D> polyolefin resin layer in order from the side facing the encapsulation part (Second outermost layer) / nylon resin layer / ethylene-vinyl alcohol copolymer resin layer / nylon resin layer / polyolefin resin layer, 3 types and 5 layers structure, and the like.
  • each of the second extruded multilayer structure portions may be independently laminated with at least one resin layer on the other resin layer by extrusion molding.
  • all the resin layers are laminated by coextrusion molding. It is preferable that all the resin layers obtained by this coextrusion molding are not stretch-treated.
  • the second extruded multilayer structure portion is preferably ⁇ 2A> or ⁇ 2B>. Further, in the second extruded multilayer structure portion of ⁇ 2A>, it is preferable that the polyolefin resin layer and the ethylene-vinyl alcohol copolymer resin layer are coextruded films, respectively, and further, a polyolefin resin. It is more preferable that the layer, the adhesive resin layer and the ethylene-vinyl alcohol copolymer resin layer are coextruded films, respectively.
  • the second extruded multilayer structure portion of ⁇ 2B> is preferably a co-extruded film in which the polyolefin resin layer, the ethylene-vinyl alcohol copolymer resin layer, and the polyolefin resin layer are each extruded and molded. It is more preferable that the polyolefin resin layer, the adhesive resin layer, the ethylene-vinyl alcohol copolymer resin layer, the adhesive resin layer and the polyolefin resin layer are coextruded films, respectively.
  • the second film layer is a resin layer constituting the second innermost layer (the innermost layer of the second film layer) inside the second extruded multilayer structure portion, and is a heat-resistant resin layer. It may be laminated.
  • the resin layer having excellent heat resistance include those exemplified in the heat-resistant resin layer of the first film layer, and examples thereof include a polyester resin layer, a nylon resin layer, and a stretched polyolefin resin layer.
  • a polyester resin layer or a stretched polyolefin resin layer is used, and more preferably, a biaxially stretched polyethylene terephthalate film or a biaxially stretched polyolefin film is used.
  • the heat-resistant resin layer constituting the second innermost layer may be a single layer or may have a multi-layer structure of two or more layers. Further, the heat-resistant resin layer may be provided with an inorganic vapor deposition film such as a metal vapor deposition film or a silica vapor deposition film. This heat-resistant resin layer may be laminated on the inner surface of the second extruded multilayer structure portion via an adhesive, or may be laminated on the inner surface of the second extruded multilayer structure portion by extrusion molding. Good. When the heat-resistant resin layer is laminated by extrusion molding, it may be co-extruded at the same time as the binder-like resin layer (for example, polyethylene resin layer) in the same manner as the first film layer.
  • the binder-like resin layer for example, polyethylene resin layer
  • FIG. 9 shows some examples of layer configurations of the second film layer.
  • the second film layer 2 of FIG. 9A is a polyolefin resin layer 21 (second outermost layer) / adhesive resin layer / ethylene-vinyl alcohol copolymer resin layer in order from the side (outside) facing the encapsulation portion. It has a layer structure of 22 / adhesive resin layer / polyolefin resin layer 23 (second innermost layer).
  • the second film layer 2 of FIG. 9B is a polyolefin resin layer 21 (second outermost layer) / adhesive resin layer / ethylene-vinyl alcohol copolymer resin layer in order from the side (outside) facing the encapsulation portion.
  • the second film layer 2 of FIG. 9C is a polyolefin resin layer 21 (second outermost layer) / adhesive resin layer / nylon resin layer 27 / adhesive resin layer in this order from the side (outside) facing the encapsulation portion. It has a layer structure of / ethylene-vinyl alcohol copolymer resin layer 22 / adhesive resin layer / nylon resin layer 28 / adhesive resin layer / polyolefin resin layer 23 (second innermost layer).
  • At least one resin layer is laminated by extrusion molding. And preferably, all resin layers are laminated by coextrusion molding.
  • the second film layer 2 of FIG. 9C for example, at least one resin layer is laminated by extrusion molding, and preferably all resin layers are laminated by co-extrusion molding.
  • the thickness of the polyolefin resin layers 21 and 23 of the second film layer 2 is not particularly limited, and is, for example, 10 ⁇ m to 150 ⁇ m.
  • the polyolefin resin layer 21 forming the outermost layer of the second film layer 2 is a heat-sealed layer, it is preferably relatively thick.
  • the thickness of the polyolefin resin layer 21 constituting the second outermost layer is 20 ⁇ m to 150 ⁇ m.
  • the thickness of the ethylene-vinyl alcohol copolymer resin layer 22 of the second film layer 2 is not particularly limited, and is, for example, 4 ⁇ m to 40 ⁇ m.
  • the thickness of the polyester resin layer 26 of the second film layer 2 is not particularly limited, and is, for example, 8 ⁇ m to 40 ⁇ m.
  • the thickness of the nylon resin layers 27 and 28 of the second film layer 2 is not particularly limited, and is, for example, 8 ⁇ m to 40 ⁇ m.
  • the thickness of the adhesive resin layer of the second film layer 2 is not particularly limited, and is, for example, 3 ⁇ m to 10 ⁇ m.
  • the adhesive layer 24 is formed by using a laminating adhesive in the same manner as the first film layer.
  • the thickness of the adhesive layer 24 is not particularly limited, and is, for example, 2 ⁇ m to 30 ⁇ m.
  • the second film layer may be provided with a design print layer (not shown), if necessary.
  • a design print layer (not shown), if necessary.
  • the design printing layer is provided on the second film layer, it is preferable to provide the design printing layer so that the design can be seen from the outside of the container body.
  • the design print layer is provided on the second film layer, the design print layer is provided on the outer surface and / and inner surface of the second innermost layer, or is provided on the outer surface and / and inner surface of the resin layer other than the second innermost layer. ..
  • the polyolefin resin layer of the first film layer and the second film layer is composed of a polyolefin having heat-sealing property.
  • a polyolefin having heat-sealing property general-purpose polyethylene or polypropylene can be used, preferably low-density polyethylene, and more preferably linear low-density polyethylene.
  • Linear low density polyethylene is a polymer containing at least a structural unit derived from ethylene as a repeating unit.
  • the linear low-density polyethylene contains a short-chain branched structure and is generally a low-density polyethylene obtained by copolymerizing ethylene with an ⁇ -olefin at medium pressure or low pressure.
  • the density of the linear low-density polyethylene is, for example, about 0.850 to 0.945 g / cm 3 , preferably about 0.910 to 0.925 g / cm 3 .
  • the ethylene-vinyl alcohol copolymer resin layer of the first film layer and the second film layer is composed of an ethylene-vinyl alcohol copolymer.
  • the ethylene-vinyl alcohol copolymer has a high gas barrier property.
  • the ethylene-vinyl alcohol copolymer is a polymer compound obtained by saponifying an ethylene-vinyl acetate-based copolymer (a copolymer containing ethylene and vinyl acetate as essential monomer components).
  • the ethylene component content of the ethylene-vinyl alcohol-based copolymer is preferably 20 to 60% by weight based on the total amount of the monomer components.
  • the degree of saponification of the vinyl acetate component is preferably 95 mol% or more from the viewpoint of gas barrier properties.
  • the polyester resin layer of the first film layer and the second film layer is composed of polyester.
  • polyester polyethylene terephthalate (PET) type, poly (ethylene-2,6-naphthalene carboxylate) (PEN) type and the like can be used, and polyethylene terephthalate (PET) type can be preferably used.
  • PET polyethylene terephthalate
  • PET polyethylene terephthalate
  • the nylon resin layer of the first film layer and the second film layer is composed of polyamide.
  • polyamide-6, polyamide-12, polyamide-66, polyamide-610, polyamide-11 and the like can be used.
  • the container body 6 (sheet material container 5) made of the sheet material 3 having the first film layer 1 and the second film layer 2 is required not to break the sealed portion when dropped.
  • at least one MD direction of the first film layer 1 and the second film layer 2 (this MD direction is a state in which the sheet material container 5 is self-supporting). It is preferable to increase the tensile elongation of the sheet material container 5 (corresponding to the width direction of the sheet material container 5), and to increase the tensile elongation of both the first film layer 1 and the second film layer 2 in the MD direction. It is more preferable to keep it high.
  • the tensile elongation in the MD direction of each of the extruded multilayer structure portions of the first film layer 1 and the second film layer 2 is preferably 300% or more independently. From the viewpoint of further enhancing the impact resistance, 400% or more is more preferable, and from the viewpoint of further enhancing the impact resistance, 500% or more is further preferable. At least one TD direction of the first film layer 1 and the second film layer 2 (this TD direction corresponds to the height direction of the sheet material container 5 with reference to the state in which the sheet material container 5 is self-supporting).
  • the tensile elongation in the TD direction of each of the extruded multilayer structure portions of the first film layer 1 and the second film layer 2 is preferably 300% or more independently. From the viewpoint of further enhancing the impact resistance, 400% or more is more preferable, and from the viewpoint of further enhancing the impact resistance, 500% or more is further preferable.
  • FIG. 10 is an enlarged end view of the container body constitution sheet material 3 having the first film layer 1 and the second film layer 2 having a preferable layer structure from the above-exemplified examples.
  • FIG. 10 is also an end view obtained by cutting a portion along the line XX of FIG.
  • the first film layer 1 has a polyolefin resin layer 11 / adhesive resin layer / ethylene-vinyl alcohol copolymer resin layer 12 / in order from the side (inside) facing the non-bonded portion 31 or the encapsulating portion 51. It has an adhesive resin layer / polyolefin resin layer 13 / adhesive layer 14 / design printing layer / polyester resin layer 16.
  • the second film layer 2 is composed of the polyolefin resin layer 21 / adhesive resin layer / ethylene-vinyl alcohol copolymer resin layer 22 / adhesive resin layer in this order from the side (outside) facing the non-bonded portion 31 or the sealed portion 51. / Has a polyolefin resin layer 23. In FIG. 10, the adhesive resin layer and the design printing layer are not shown.
  • FIG. 11 is a plan view of the sheet material 71 (inner container constituent sheet material 71) constituting the inner container 7.
  • the inner container constituent sheet material 71 is used so as to be stacked on the inside of the container body constituent sheet material 3 (on the innermost layer side of the second film layer 2). Also in the inner container constituent sheet material 71, the hole portion 33 is formed in the portion forming the ceiling gusset portion 6d.
  • the inner container constituent sheet material 71 is not particularly limited, but it is preferable to use a multilayer film having a polyolefin resin layer having a heat seal property on both sides, and further, a polyolefin resin layer having a heat seal property on both sides and a gas barrier.
  • the polyolefin resin layer having heat-sealing property is preferably a polyolefin resin layer that has not been stretched.
  • the inner container constituent sheet material 71 is composed of a multilayer film having at least two kinds selected from a polyolefin resin layer, an ethylene-vinyl alcohol copolymer resin layer, and a nylon resin layer.
  • the multilayer film constituting the inner container constituent sheet material 71 may be one in which all the resin layers are formed by an extrusion molding method (coextrusion film), or two or more resin layers are formed by an extrusion molding method. A part of the layers may be laminated and bonded via an adhesive layer, or all layers may be laminated and bonded via an adhesive layer.
  • a polyolefin resin layer having a heat-sealing property of ⁇ 7F> / an adhesive layer / a polyester resin layer with an inorganic vapor-deposited film / an adhesive layer / a nylon resin layer / an adhesive layer / A polyolefin resin layer having a heat-sealing property is used.
  • the inorganic vapor deposition film a metal vapor deposition film such as aluminum, a silica vapor deposition film, or the like can be used.
  • FIG. 12 (a) is an enlarged end view of the inner container constituent sheet material 71 having one layer structure in the above-exemplified example, and FIG. 12 (b) has another layer structure in the above-exemplified example. It is an enlarged end view of the inner container constituent sheet material 71.
  • FIG. 12 is also an end view obtained by cutting a portion along the line XII-XII of FIG.
  • the inner container constituent sheet material 71 is arranged in order from the side facing the container body constituent sheet material 3 (in order from the outside), the polyolefin resin layer 711 / adhesive layer / polyester resin layer 712 with inorganic vapor deposition film. / Adhesive layer / Polyolefin resin layer 713.
  • FIG. 12A is an enlarged end view of the inner container constituent sheet material 71 having one layer structure in the above-exemplified example
  • FIG. 12 (b) has another layer structure in the above-exemplified example. It is an enlarged end view of the inner container constituent
  • the inner container constituent sheet material 71 is arranged in order from the side facing the container body constituent sheet material 3 (in order from the outside), the polyolefin resin layer 714 / the adhesive layer / the polyester resin layer 715 with the inorganic vapor deposition film. It has an adhesive layer / nylon resin layer 716 / adhesive layer or adhesive resin layer / polyolefin resin layer 717. In FIG. 12, the adhesive layer (or adhesive resin layer) is not shown.
  • the inner container constituent sheet material 71 may be provided with a design printing layer (not shown), if necessary.
  • a design printing layer is provided on the inner container constituent sheet material 71, it is preferable to provide the design so that the design can be seen from the outside of the container body.
  • the design printing layer is provided on the inner container constituent sheet material 71, the design printing layer is provided on the outer surface of the innermost layer of the sheet material 71, or is provided on the outer surface and / or the inner surface of the resin layer other than the innermost layer.
  • the inner container constituent sheet material 71 shown in FIG. 11 is superposed on the inner surface side of the container body constituent sheet material 3 shown in FIG. 6, and the peripheral portion 3a of the container body constituent sheet material 3 and the inner container constituent sheet material 71 is overlapped. , 71a are heat-sealed with each other to form a container main body constituent sheet material with an inner container constituent sheet material (hereinafter, referred to as a container main body sheet material with an inner container).
  • the inner container 7 is formed in the container main body 6.
  • the sheet material container 5 to be provided is formed.
  • the filling material 51 as shown in FIGS. 1 to 3 is sealed by filling the sealing portion 51 of the sheet material container 5 with a filler such as air from the introduction port 34 and then sealing the introduction port 34.
  • the sheet material container 5 is filled in the portion 51.
  • the heat seal includes heat seal using a heated heat seal bar or a heated roll, heat seal using an ultrasonic seal, a high frequency seal, etc., and refers to all heat seals regardless of the means. ..
  • FIG. 13 is an enlarged end view of a part of the sheet material container 5 formed by using the container body constituent sheet material 3 and the inner container constituent sheet material 7.
  • FIG. 13 is also an end view showing in detail the layer structure of the container body constituent sheet material 3 and the inner container constituent sheet material 71 for a part of the sheet material container 5 of FIG.
  • the first film layer 1 has a polyolefin resin layer 11 / adhesive resin layer / ethylene-vinyl alcohol copolymer resin layer 12 / in order from the side (inside) facing the non-bonded portion 31 or the encapsulating portion 51. It has an adhesive resin layer / polyolefin resin layer 13 / adhesive layer 14 / design printing layer / polyester resin layer 16.
  • the second film layer 2 is composed of the polyolefin resin layer 21 / adhesive resin layer / ethylene-vinyl alcohol copolymer resin layer 22 / adhesive resin layer in this order from the side (outside) facing the non-bonded portion 31 or the sealed portion 51. / Has a polyolefin resin layer 23.
  • the inner container constituent sheet material 71 is arranged in order from the side facing the container body constituent sheet material 3 (from the outside), polyolefin resin layer 711 / adhesive layer / polyester resin layer with inorganic vapor deposition film 712 / adhesive layer / polyolefin resin. It has layer 713. In FIG. 13, the adhesive resin layer and the adhesive layer are not shown except for the adhesive layer of the first film layer 1 (the same applies to FIG. 26).
  • the first film layer 1 of the sheet material container 5 of the present invention is the first extruded multilayer of the polyolefin resin layer 11 / ethylene-vinyl alcohol copolymer resin layer 12 on the side facing the encapsulation portion 51. It has a structural portion (preferably a first extruded multilayer structural portion of the polyolefin resin layer 11 / ethylene-vinyl alcohol copolymer resin layer 12 / polyolefin resin layer 13). In such a sheet material container 5, the first film layer 1 is difficult to delaminate.
  • the layers of the first film layer 1 are laminated in the region corresponding to the encapsulation portion 51 as compared with the conventional sheet material container. Peeling is less likely to occur. Delamination is unlikely to occur in the second film layer 2.
  • the reason why the sheet material container 5 of the present invention can be prevented from delamination is not clear, but the first film layer 1 having no nylon resin layer between the polyolefin resin layer 11 and the ethylene-vinyl alcohol copolymer resin layer 12 It is presumed that this is due to the fact that the polyolefin resin layer 11 and the ethylene-vinyl alcohol copolymer resin layer 12 are laminated by extrusion molding.
  • the sheet material container 5 contains a relatively large amount of polyolefin resin. This is because polyolefin resins such as polyethylene are easy to recycle. From this point of view, the first film layer 1, the second film layer 2 and / and the inner container constituent sheet material 71 (excluding the polyester resin layer and the nylon resin layer) are mainly composed of the polyolefin resin layer. Is preferable.
  • the first film layer 1 constituting the sheet material container 5 is stretched by being laminated on the outside of the first extruded multilayer structure portion and the first extruded multilayer structure portion via an adhesive. It has a polyethylene resin layer and.
  • the first extruded multilayer structure include the above-mentioned ⁇ 1A> to ⁇ 1D>, and among them, a linear low-density polyethylene resin layer / ethylene-vinyl alcohol copolymer resin having a heat-sealing property.
  • a coextruded film made of a linear low-density polyethylene resin layer having a layer / heat-sealing property is preferable.
  • the stretched polyethylene resin layer examples include a biaxially stretched linear low-density polyethylene film (biaxially stretched LLDPE film) and a biaxially stretched high-density polyethylene film. If heat resistance to heat sealing can be obtained, a high-density polyethylene resin layer that has not been stretched can be used instead of the stretched polyethylene. From the viewpoint of recyclability, the first extruded multilayer structure and the stretched polyethylene resin layer can be bonded to each other without using a dry laminating adhesive, for example, between the first extruded multilayer structure and the stretched polyethylene resin layer. In addition, it is preferable to melt-extrude polyethylene resin (LDPE) for molding. Further, the stretched polyethylene resin layer may be formed by laminating on the outside of the first extruded multilayer structure portion and then stretching the stretched polyethylene resin layer together with the first extruded multilayer structure portion.
  • LDPE melt-extrude polyethylene resin
  • the second film layer 2 constituting the sheet material container 5 has the above-mentioned second extruded multilayer structure portion.
  • the second extruded multilayer structure include the above-mentioned ⁇ 2A> to ⁇ 2D>, and among them, a linear low-density polyethylene resin layer / ethylene-vinyl alcohol copolymer resin having heat-sealing property.
  • a co-extruded film made of a linear low-density polyethylene resin layer having a layer / heat-sealing property is preferable.
  • the inner container constituent sheet material 71 is a linear low-density polyethylene resin layer having heat-sealing property / ethylene-vinyl alcohol copolymer resin layer / linear low-density having heat-sealing property.
  • a co-extruded film made of a density polyethylene resin layer is preferable.
  • the heat-sealing polyethylene-based resin used for the material 71 preferably has the same or similar density, average molecular weight, melting point, etc., and more preferably the same average molecular weight.
  • the polyethylene resin used for the first outermost layer and the polyethylene resin used for the first extruded multilayer structure portion are stretched to the outside of the first extruded multilayer structure portion using a material having the same average molecular weight.
  • the stretched polyethylene resin layer include a laminated first film layer.
  • the same average molecular weight means that the number average molecular weight and the weight average molecular weight do not have to be completely the same, and are substantially the same including the range of variations in resin production.
  • the polyethylene resin can be classified into four types, high density polyethylene, medium density polyethylene, low density polyethylene and linear low density polyethylene, according to the density and structure.
  • the density of the polyethylene resin as a raw material before each stretched polyethylene resin used for the first outermost layer and the second outermost layer is stretched is used for the first extruded multilayer structure portion and the second extruded multilayer structure portion, respectively. It is preferable that the density is the same as the density of the polyethylene-based resin having a heat-sealing property and / or the density of the polyethylene-based resin having a heat-sealing property used for the inner container constituent sheet material 71. That is, the polyethylene resin in the extruded multilayer structure portion and the stretched polyethylene resin layer use a polyethylene resin having the same density as a raw material, and the first film layer 1 is extruded after the stretched polyethylene resin layer is stretched. It may be formed by being laminated on the outside of the multilayer structure portion. The same density means that the densities do not have to be exactly the same and are substantially the same including the range of variations in resin production.
  • a film that has been co-extruded and then stretched can also be used as the co-extruded film of the first extruded multilayer structure portion, the second extruded multilayer structure portion and the inner container constituent sheet.
  • a film that has been co-extruded and then stretched can also be used.
  • a first film it is formed by stretching a first extruded multilayer structure portion having a polyethylene resin layer (first innermost layer) / ethylene-vinyl alcohol copolymer resin layer / polyethylene resin layer. Film can be mentioned.
  • the stretched polyethylene resin layer laminated on the outside of the first extruded multilayer structure portion via an adhesive may be omitted.
  • the first film layer 1 and the like contain an ethylene-vinyl alcohol copolymer resin.
  • this resin layer does not adversely affect recycling.
  • the bonding portion 32 is formed between the layers of the first film layer 1 and the second film layer 2 except for the sealing portion 51, but the present invention is not limited to this.
  • a linear joint portion 32 may be formed between the layers of the first film layer 1 and the second film layer 2, and the encapsulation portion 51 may be defined by the joint portion 32.
  • FIG. 14A is a plan view of the first film layer 1 constituting the container body constituent sheet material 3 of the present embodiment
  • FIG. 14B is a second view constituting the container body constituent sheet material 3. It is a top view of the film layer 2.
  • the first film layer 1 and the second film layer 2 have substantially the same shape and the same size in a plan view, for example.
  • the first film layer 1 and the second film layer 2 are each provided with a pair of extension pieces 111, 211 for introducing a filler.
  • An introduction port 112 for a filler is formed at the edge between the extending piece portions 111, 211.
  • a through hole 113 is formed in the portion of the first film layer 1 that forms the first main surface portion 6a, and the portion of the second film layer 2 that forms the first main surface portion 6a is formed through the through hole.
  • the outside air introduction port 213 is formed.
  • the container body constituent sheet as shown in FIG. 15 is formed. Material 3 is obtained.
  • the region partitioned by the linear joint portion 32 is the sealing portion 51 in which the filler can be sealed.
  • innumerable dots are attached to the region serving as the encapsulation portion 51 of the present embodiment.
  • the joining of the first film layer 1 and the second film layer 2 is performed by, for example, heat sealing.
  • the first film layer 1 of the present embodiment also has an extruded multilayer structure portion of a polyolefin resin layer / ethylene-vinyl alcohol copolymer resin layer on the side facing the encapsulation portion.
  • the second film layer 2 has an extruded multilayer structure portion of a polyolefin resin layer / ethylene-vinyl alcohol copolymer resin layer / polyolefin resin layer on the side facing the encapsulation portion.
  • the innermost layer of the first film layer 1 is composed of a polyolefin resin layer having a heat-sealing property
  • the second film layer 2 The outermost layer is composed of a polyolefin resin layer having a heat-sealing property.
  • FIG. 16A is a plan view of the inner container constituent sheet material 71, and is a plan view of the container main body sheet material 8 with an inner container in which the inner container constituent sheet material 71 is superposed and joined to the inner surface of the container body constituent sheet material 3. It is a figure.
  • the inner container constituent sheet material 71 has, for example, substantially the same shape and the same size as the second film layer 2 in a plan view. No holes are formed in the plane of the inner container constituent sheet material 71.
  • the outer surface of the inner container constituent sheet material 71 shown in FIG. 16A is overlapped with the inner surface side of the container main body constituent sheet material 3 shown in FIG. 15 (on the inner surface side of the second film layer 2), and the container main body constituent sheet material 3 is overlapped.
  • the container body sheet material 8 By joining the peripheral edge portion of the container and the peripheral edge portion of the inner container constituent sheet material 71, the container body sheet material 8 with an inner container shown in FIG. 16B can be obtained.
  • the peripheral edge portion of the first film layer 1 and the peripheral portion of the second film layer 2 of the container body constituent sheet material 3 are also joined at the same time.
  • a portion (peripheral portion) to which the inner container constituent sheet material 71 is joined is shaded.
  • the container body constituent sheet material 3 and the inner container constituent sheet material 71 are joined by, for example, heat sealing.
  • a hole 33 for attaching the spout 61 is formed in a portion of the container body sheet material 8 with an inner container that forms the top gusset portion 6d.
  • the hole 33 is a through hole that penetrates the first film layer 1, the second film layer 2, and the inner container constituent sheet material 71.
  • the container body sheet material 8 with an inner container is bent as shown in FIG. 17A. Specifically, of the container body sheet material 8 with an inner container, the portion forming the bottom gusset portion 6c is folded inward, and the portion forming the top gusset portion 6d is the inner surface side of the portion forming the second main surface portion 6b.
  • the sheet material container 5 of the present embodiment also has a container body 6 formed of the sheet material 3 including the first film layer 1 and the second film layer 2 and an inner container 7.
  • a sealing portion 31 capable of sealing a filler is formed between the layers of the first film layer 1 and the second film layer 2.
  • the first film layer 1 and the second film layer 2 formed in advance in a predetermined shape are joined to form the container body constituent sheet material 3, and the inner container constituent sheet material 71 formed in advance in a predetermined shape is joined.
  • the sheet material container 5 is formed by forming the container body sheet material 8 with an inner container, bending the sheet material 8 as appropriate, and joining the peripheral portions thereof.
  • the production of the sheet material container 5 is not limited to this procedure.
  • a single-wafer-shaped first film layer and a second film layer are overlapped and joined (joined at the same location as the joining portion 32 forming the above-mentioned sealing portion 31), and the single-wafer-shaped first film layer and the second film layer are joined to this.
  • the peripheral portion of the container main body constituent sheet material 3 and the peripheral portion of the inner container constituent sheet material 71 described above are joined at the same location as the peripheral portion of the inner container constituent sheet material 71), and the three-layer single-wafer laminated body is joined.
  • 18 and 19 are formed by attaching a spout to the portion forming the gusset portion and then bending it appropriately to form a container shape while joining the peripheral portion and punching the outside (or punching after joining).
  • the sheet material container 5 as shown in the above may be manufactured.
  • the filler is introduced into the sealing portion 51 from the introduction port 112 of the sheet material container 5, and the extending piece portion 111 for introducing the filler is removed while being sealed.
  • a sheet material container 5 in which the filling material is filled in the sealing portion 51 and is self-supporting can be obtained.
  • a cap such as a cap with a pump is attached to the spout 61.
  • the cap is not shown.
  • the contained objects 4 stored in the accommodating space 53 are represented by dots.
  • the first film layer 1 and the second film layer 2 constituting the container body 6 have an outside air introduction port 213 composed of a through hole 113 and a through hole in a portion other than the sealing portion 51 (for example, the first main surface portion 6a). It is formed.
  • the through hole 113 and the outside air introduction port 213 are arranged in the in-plane portion of the first film layer 1 and the second film layer 2 surrounded by the sealing portion 51.
  • the space between the first film layer 1 and the second film layer 2 and the inner container 7 and the container body 6 (second film layer 2) in the portion surrounded by the sealing portion 51 are both non-bonded, and the voids 6f and 6f, respectively. It has 7f (see FIG. 21).
  • the gaps 6f and 7f communicate with the outside through the through holes 113 and the outside air introduction port 213.
  • the volume of the inner container 7 decreases as shown in FIG. 22. Since the outside air flows in and out of the gap 7f through the through hole 113 and the outside air introduction port 213 (the air flow is indicated by an arrow), even if the inner container 7 becomes smaller as the contents 4 decrease, the container body 6
  • the outer shape of the is hard to collapse.
  • the sheet material container 5 is self-supporting in a good state even if the contents 4 are reduced.
  • the first film layer 1 and the second film layer 2 are formed to have substantially the same shape and the same size in a plan view.
  • the second film layer 2 is the first film. It may be formed slightly smaller than the layer 1 in a plan view.
  • innumerable dots are attached to the non-joined portions.
  • 24 and 25 show a container body constituent sheet material 3 in which the first film layer 1 and the second film layer 2 having the same shape are laminated. Since the second film layer 2 is slightly smaller than the first film layer 1 in a plan view, the inner surface of the first film layer 1 is exposed on the peripheral edge portion 3a of the container body constituent sheet material 3.
  • the inner container constituent sheet material 71 shown in FIG. 11 is superposed on the inner surface side of the container body constituent sheet material 3 shown in FIG. 24, and the peripheral edge portion 3a (exposed first film) of the container body constituent sheet material 3 is laminated.
  • the inner surface of the layer 1) and the peripheral edge portion 71a of the inner container constituent sheet material 71 are joined by a heat seal or the like to form a container main body constituent sheet material with an inner container.
  • the container main body 6 as shown in FIG. 26 is formed by bending the container main body constituent sheet material with an inner container inward, joining the peripheral portions thereof, and filling and sealing the non-joining portion 31 with a filler.
  • a sheet material container 5 having an inner container 7 is formed inside.
  • the sheet material container 5 of this modified example is different from the sheet-like container of the above embodiment in that the second film layer 2 is not interposed in the peripheral edge portion 3a, and the remaining configuration is the same. is there.
  • the sheet material container including the container body and the inner container has been described, but in other embodiments, the sheet material container having no inner container may be used.
  • Such other embodiments include the following aspects: ⁇ Aspect 1> A sheet material container including a container body that defines a storage space for accommodating an object, wherein the container body includes a first film layer and a second film layer arranged inside the first film layer.
  • the sheet material of the container body is formed of a material, and the sheet material of the container body is formed between a joint portion where the layers of the first film layer and the second film layer are bonded and between the layers of the first film layer and the second film layer.
  • the first film layer has an extruded multilayer structure portion of a polyolefin resin layer / ethylene-vinyl alcohol copolymer resin layer on the side facing the encapsulation portion.
  • Sheet material container ⁇ Aspect 2>
  • the extruded multilayer structure portion of the first film layer has a polyolefin resin layer / ethylene-vinyl alcohol copolymer resin layer / polyolefin resin layer.
  • the extruded multilayer structure portion of the first film layer is formed by coextrusion.
  • the second film layer has an extruded multilayer structure portion of a polyolefin resin layer / ethylene-vinyl alcohol copolymer resin layer / polyolefin resin layer on the side facing the encapsulation portion. .. ⁇ Aspect 5> In any of the above aspects 1 to 4, the polyolefin resin layer of the second film layer is a linear low-density polyethylene resin layer. ⁇ Aspect 6> In any of the above aspects 1 to 5, the polyolefin resin layer of the first film layer is a linear low-density polyethylene resin layer.
  • the first film layer has an extruded multilayer structure portion and a polyester resin layer laminated on the outside of the extruded multilayer structure portion, and the polyester resin layer comprises. It constitutes the outer surface of the container body.
  • the first film layer has the extruded multilayer structure portion and the stretched polyethylene resin layer laminated on the outside of the extruded multilayer structure portion, and the stretched polyethylene resin layer. Consists of the outer surface of the container body.
  • the stretched polyethylene resin layer is formed by biaxial stretching.
  • the polyolefin resin layer of the first film layer is a polyethylene resin layer, and the average molecular weight of the polyethylene resin used for the polyethylene resin layer and the average molecular weight of the polyethylene resin used for the stretched polyethylene resin layer are It is the same.
  • the stretched polyethylene resin layer is formed by being laminated on the outside of the extruded multilayer structure and then stretched.
  • the first film layer is formed by melt-extruding a polyethylene resin between the extruded multilayer structure portion and the stretched polyethylene resin layer.
  • the tensile elongation of the extruded multilayer structure portion of the first film layer in the MD direction and / and the TD direction is 300% or more, preferably 400% or more, more preferably 500% or more.
  • the tensile elongation of the extruded multilayer structure portion of the first film layer in the MD direction and / and the TD direction is 900% or less, preferably 800% or less, more preferably 700% or less.
  • the tensile elongation of the extruded multilayer structure portion of the second film layer in the MD direction and / and the TD direction is 300% or more, preferably 400% or more, more preferably 500% or more.
  • the tensile elongation of the extruded multilayer structure portion of the second film layer in the MD direction and / and the TD direction is 900% or less, preferably 800% or less, more preferably 700%. is there.
  • the filler is sealed in the sealing portion.
  • a sheet material container including a container body that defines a storage space for accommodating an object, wherein the container body includes a first film layer and a second film layer arranged inside the first film layer.
  • the sheet material of the container body is formed of a material between the joint portion where the layers of the first film layer and the second film layer are bonded and the layer between the first film layer and the second film layer. It has an encapsulation portion in which a filler can be encapsulated, and the first film layer is an extruded multilayer of a polyolefin resin layer / polyethylene-vinyl alcohol copolymer resin layer / polyolefin resin layer on the side facing the encapsulation portion.
  • the polyolefin resin layer having a structural portion is a stretched polyethylene resin layer, and the stretched polyethylene resin layer is formed by stretching the extruded multilayer structure portion after the extruded multilayer structure portion is formed. .. ⁇ Aspect 19> In the aspect 18, the filler is sealed in the sealing portion. ⁇ Aspect 20> In the aspect 18 or 19, the inner container covered by the container body and defining the storage space is provided. ⁇ Aspect 21> A sheet material container including a container body that defines a storage space for accommodating an object, wherein the container body includes a first film layer and a second film layer arranged inside the first film layer.
  • the sheet material of the container body is formed of a material, and is formed between a joint portion in which the layers of the first film layer and the second film layer are bonded and the layers of the first film layer and the second film layer. It has an encapsulation portion in which a filler can be encapsulated, and the first film layer is an extruded multilayer of a polyolefin resin layer / ethylene-vinyl alcohol copolymer resin layer / polyolefin resin layer on the side facing the encapsulation portion.
  • the polyolefin resin layer is a polyethylene resin layer
  • the stretched polyethylene resin layer is used as a raw material before being stretched.
  • the density of the polyethylene resin is the same as the density of the polyethylene resin layer of the extruded multilayer structure portion, and the first film layer is formed of the extruded multilayer structure portion after the stretched polyethylene resin layer is stretched. It is formed by being laminated on the outside.
  • the filler is sealed in the sealing portion.
  • the inner container covered by the container body and defining the storage space is provided.
  • Linear low density polyethylene resin is described as "LLDPE”
  • low density polyethylene resin is described as “LDPE”
  • ethylene-vinyl alcohol copolymer resin is described as “EVOH”
  • nylon resin is described as “Ny”
  • polyethylene is described as "PET”
  • the adhesive resin is described as "AD”
  • the dry laminate adhesive is described as "Dry”.
  • transparent thin-film deposition means that the silica-film-deposited film is vapor-deposited on one side.
  • the coextruded films used in each of the Examples and Comparative Examples were not stretched after the film formation.
  • Example 1 As the first film layer, a co-extruded film of an LLDPE layer having a thickness of 30 ⁇ m, an AD layer having a thickness of 4 ⁇ m, an EVOH layer having a thickness of 10 ⁇ m, an AD layer having a thickness of 4 ⁇ m, and an LLDPE layer having a thickness of 100 ⁇ m was prepared in this order from the outside.
  • a co-extruded film of an LLDPE layer having a thickness of 100 ⁇ m, an AD layer having a thickness of 4 ⁇ m, an EVOH layer having a thickness of 10 ⁇ m, an AD layer having a thickness of 4 ⁇ m, and an LLDPE layer having a thickness of 30 ⁇ m was prepared in this order from the outside.
  • the outer surface of the first film layer and the second film layer are used to superimpose the inner surface of the first film layer (LLDPE layer having a thickness of 100 ⁇ m) and the outer surface of the second film layer (LLDPE layer having a thickness of 100 ⁇ m) to form a joint.
  • the non-bonded portion and the bonded portion were formed between the layers of the first film layer and the second film layer as shown in FIG. A sheet material for the main body of the container was prepared.
  • Example 2 As the first film layer, a coextruded film of an LLDPE layer having a thickness of 30 ⁇ m, an AD layer having a thickness of 4 ⁇ m, an EVOH layer having a thickness of 10 ⁇ m, an AD layer having a thickness of 4 ⁇ m, and an LLDPE layer having a thickness of 40 ⁇ m was used in this order from the outside.
  • Example 2 As described in Example 1, except that a co-extruded film of an LLDPE layer having a thickness of 40 ⁇ m, an AD layer having a thickness of 4 ⁇ m, an EVOH layer having a thickness of 10 ⁇ m, an AD layer having a thickness of 4 ⁇ m, and an LLDPE layer having a thickness of 30 ⁇ m was used in this order from the outside. In the same manner, a container body constituent sheet material was produced.
  • an LLDPE layer having a thickness of 25 ⁇ m / an AD layer having a thickness of 4 ⁇ m / a Ny layer having a thickness of 7.5 ⁇ m / an AD layer having a thickness of 4 ⁇ m / an EVOH layer having a thickness of 10 ⁇ m / an AD layer having a thickness of 4 ⁇ m / a thickness of 7 A container body constituent sheet material was produced in the same manner as in Example 1 except that a co-extruded film of a Ny layer having a thickness of .5 ⁇ m, an AD layer having a thickness of 4 ⁇ m, and an LLDPE layer having a thickness of 50 ⁇ m was used.
  • Example 4 As the first film layer, a coextruded film of an LLDPE layer having a thickness of 18 ⁇ m, an AD layer having a thickness of 4 ⁇ m, an EVOH layer having a thickness of 6 ⁇ m, an AD layer having a thickness of 4 ⁇ m, and an LLDPE layer having a thickness of 18 ⁇ m was used in this order from the outside, and a second film layer was used.
  • Example 2 As described in Example 1, except that a co-extruded film of an LLDPE layer having a thickness of 18 ⁇ m, an AD layer having a thickness of 4 ⁇ m, an EVOH layer having a thickness of 6 ⁇ m, an AD layer having a thickness of 4 ⁇ m, and an LLDPE layer having a thickness of 18 ⁇ m was used in this order from the outside. In the same manner, a container body constituent sheet material was produced.
  • the first film layer in order from the outside, an LLDPE layer having a thickness of 25 ⁇ m / an AD layer having a thickness of 4 ⁇ m / a Ny layer having a thickness of 7.5 ⁇ m / an AD layer having a thickness of 4 ⁇ m / an EVOH layer having a thickness of 10 ⁇ m / an AD layer having a thickness of 4 ⁇ m / a thickness of 7
  • the second film layer is an LLDPE layer with a thickness of 25 ⁇ m / an AD layer with a thickness of 4 ⁇ m / a thickness of 7.5 ⁇ m in order from the outside.
  • a container body constituent sheet material in the same manner as in Example 1.
  • Example 2 As the first film layer, a laminated film of a 25 ⁇ m-thick LLDPE layer / Dry layer / 15 ⁇ m-thick transparent vapor-deposited biaxially stretched Ny layer / Dry layer / 40 ⁇ m-thick LLDPE layer was used in this order from the outside, and as the second film layer, A container in the same manner as in Example 1 except that a laminated film of a 40 ⁇ m-thick LLDPE layer / Dry layer / 15 ⁇ m-thick transparent vapor-deposited biaxially stretched Ny layer / Dry layer / 25 ⁇ m-thick LLDPE layer was used in this order from the outside. A main body constituent sheet material was produced.
  • Example 3 As the first film layer, a laminated film of a 25 ⁇ m-thick LLDPE layer / Dry layer / 15 ⁇ m-thick transparent vapor-deposited biaxially stretched Ny layer / Dry layer / 30 ⁇ m-thick LLDPE layer was used in this order from the outside, and as the second film layer, A container in the same manner as in Example 1 except that a laminated film of a 30 ⁇ m-thick LLDPE layer / Dry layer / 15 ⁇ m-thick transparent vapor-deposited biaxially stretched Ny layer / Dry layer / 25 ⁇ m-thick LLDPE layer was used in this order from the outside. A main body constituent sheet material was produced.
  • Example 4 As the first film layer, a laminated film of a 25 ⁇ m-thick LLDPE layer / Dry layer / 12 ⁇ m-thick transparent vapor-deposited biaxially stretched PET layer / Dry layer / 30 ⁇ m-thick LLDPE layer was used in this order from the outside, and as the second film layer, A container in the same manner as in Example 1 except that a laminated film of a 30 ⁇ m-thick LLDPE layer / Dry layer / 12 ⁇ m-thick transparent vapor-deposited biaxially stretched PET layer / Dry layer / 25 ⁇ m-thick LLDPE layer was used in this order from the outside. A main body constituent sheet material was produced.
  • a laminated film of a 20 ⁇ m-thick LLDPE layer / Dry layer / 12 ⁇ m-thick biaxially stretched EVOH layer / Dry layer / 25 ⁇ m-thick LLDPE layer was used in this order from the outside, and as the second film layer, from the outside.
  • a laminated film of a 25 ⁇ m-thick LLDPE layer / Dry layer / 12 ⁇ m-thick biaxially stretched EVOH layer / Dry layer / 20 ⁇ m-thick LLDPE layer was used in order. was produced.
  • a biaxially stretched PET layer having a thickness of 12 ⁇ m / a Dry layer / an LLDPE layer having a thickness of 30 ⁇ m / an AD layer having a thickness of 4 ⁇ m / an EVOH layer having a thickness of 10 ⁇ m / an AD layer having a thickness of 4 ⁇ m / an LLDPE having a thickness of 100 ⁇ m.
  • a container body constituent sheet material was produced in the same manner as in Example 1 except that a 12 ⁇ m biaxially stretched PET layer film was used.
  • a coextruded film was used as the LLDPE layer / AD layer / EVOH layer / AD layer / LLDPE layer of the first film layer and the second film layer.
  • the first film layer and the second film layer were produced by laminating a biaxially stretched PET film on a coextruded film via a dry laminate adhesive (Dry).
  • a biaxially stretched PET layer having a thickness of 12 ⁇ m / an LDPE layer having a thickness of 15 ⁇ m / an LLDPE layer having a thickness of 30 ⁇ m / an AD layer having a thickness of 4 ⁇ m / an EVOH layer having a thickness of 10 ⁇ m / an AD layer having a thickness of 4 ⁇ m / thickness.
  • a 100 ⁇ m LLDPE layer film is used, and as the second film layer, the LLDPE layer having a thickness of 100 ⁇ m / the AD layer having a thickness of 4 ⁇ m / the EVOH layer having a thickness of 10 ⁇ m / the AD layer having a thickness of 4 ⁇ m / the LLDPE layer having a thickness of 30 ⁇ m / thickness.
  • a container body constituent sheet material was produced in the same manner as in Example 1 except that a film of a 15 ⁇ m LDPE layer / a 12 ⁇ m thick biaxially stretched PET layer was used.
  • the first film layer and the second film layer are a co-extruded film of an LLDPE layer having a thickness of 30 ⁇ m, an AD layer having a thickness of 4 ⁇ m, an EVOH layer having a thickness of 10 ⁇ m, an AD layer having a thickness of 4 ⁇ m, and an LLDPE layer having a thickness of 100 ⁇ m. It is an extruded film formed by melt-extruding LDPE with a thickness of 15 ⁇ m between a 12 ⁇ m biaxially stretched PET film. An anchor coat layer was provided in advance on one side (melt-extruded surface of LDPE) of the biaxially stretched PET film.
  • a biaxially stretched PET layer having a thickness of 12 ⁇ m / a Dry layer / an LLDPE layer having a thickness of 25 ⁇ m / an AD layer having a thickness of 4 ⁇ m / a Ny layer having a thickness of 7.5 ⁇ m / an AD layer having a thickness of 4 ⁇ m / a thickness of 10 ⁇ m.
  • EVOH layer / AD layer having a thickness of 4 ⁇ m / Ny layer having a thickness of 7.5 ⁇ m / AD layer having a thickness of 4 ⁇ m / an LLDPE layer having a thickness of 50 ⁇ m.
  • a container body constituent sheet material was produced in the same manner as in Example 1 except that a film of a layer / Dry layer / a biaxially stretched PET layer having a thickness of 12 ⁇ m was used.
  • a coextruded film was used as the LLDPE layer / AD layer / Ny layer / AD layer / EVOH layer / AD layer / Ny layer / AD layer / LLDPE layer of the first film layer and the second film layer.
  • the first film layer and the second film layer were produced by laminating a biaxially stretched PET film on the coextruded film via a dry laminate adhesive (Dry).
  • / EVOH layer with a thickness of 10 ⁇ m / AD layer with a thickness of 4 ⁇ m / Ny layer with a thickness of 7.5 ⁇ m / AD layer with a thickness of 4 ⁇ m / LLDPE layer with a thickness of 50 ⁇ m were used.
  • a container body constituent sheet material was produced in the same manner as in Example 1 except that a film of a 25 ⁇ m LLDPE layer / a 15 ⁇ m thick LDPE layer / a 12 ⁇ m thick biaxially stretched PET layer was used.
  • This film has an LLDPE layer having a thickness of 25 ⁇ m, an AD layer having a thickness of 4 ⁇ m, a Ny layer having a thickness of 7.5 ⁇ m, an AD layer having a thickness of 4 ⁇ m, an EVOH layer having a thickness of 10 ⁇ m, an AD layer having a thickness of 4 ⁇ m, and Ny having a thickness of 7.5 ⁇ m.
  • This is an extruded film formed by melt-extruding LDPE to a thickness of 15 ⁇ m between a co-extruded film of a layer / AD layer having a thickness of 4 ⁇ m / an LLDPE layer having a thickness of 50 ⁇ m and a biaxially stretched PET film having a thickness of 12 ⁇ m.
  • An anchor coat layer was provided in advance on one side (melt-extruded surface of LDPE) of the biaxially stretched PET film.
  • the LLDPE layer with a thickness of 50 ⁇ m, the Dry layer, the biaxially stretched Ny layer with a thickness of 15 ⁇ m, the Dry layer, and the transparent vapor-deposited biaxially stretched PET layer with a thickness of 12 ⁇ m are used as the second film layer.
  • a container body constituent sheet material was produced in the same manner as in Example 1 except that a laminated film of / Dry layer / biaxially stretched PET layer having a thickness of 12 ⁇ m was used.
  • a laminated film of a transparent vapor-deposited biaxially stretched PET layer having a thickness of 12 ⁇ m / a Dry layer / a biaxially stretched Ny layer having a thickness of 15 ⁇ m / a Dry layer / an LLDPE layer having a thickness of 30 ⁇ m is used in this order from the outside.
  • a laminated film of an LLDPE layer having a thickness of 30 ⁇ m, a Dry layer, a biaxially stretched Ny layer having a thickness of 15 ⁇ m, a Dry layer, and a transparent vapor-deposited biaxially stretched PET layer having a thickness of 12 ⁇ m was used as layers in this order from the outside.
  • a container body constituent sheet material was produced in the same manner as in 1.
  • a laminated film of a transparent thin-film biaxially stretched Ny layer / Dry layer / LLDPE layer having a thickness of 20 ⁇ m is used in order from the outside, and as a second film layer, an LLDPE layer having a thickness of 20 ⁇ m is used in order from the outside.
  • a container body constituent sheet material was produced in the same manner as in Example 1 except that a laminated film of / Dry layer / transparent vapor-deposited biaxially stretched Ny layer having a thickness of 15 ⁇ m was used.
  • Example 7 As the first film layer, in order from the outside, a biaxially stretched PET layer having a thickness of 12 ⁇ m / a Dry layer / an LLDPE layer having a thickness of 30 ⁇ m / an AD layer having a thickness of 4 ⁇ m / an EVOH layer having a thickness of 10 ⁇ m / an AD layer having a thickness of 4 ⁇ m / an LLDPE having a thickness of 100 ⁇ m.
  • a container body constituent sheet material was produced in the same manner as in Example 1 except that a 12 ⁇ m biaxially stretched PET layer film was used.
  • a coextruded film was used as the LLDPE layer / AD layer / EVOH layer / AD layer / LLDPE layer of the first film layer and the second film layer.
  • Example 8 As the first film layer, in order from the outside, a biaxially stretched PET layer having a thickness of 12 ⁇ m / an LDPE layer having a thickness of 15 ⁇ m / an LLDPE layer having a thickness of 30 ⁇ m / an AD layer having a thickness of 4 ⁇ m / an EVOH layer having a thickness of 10 ⁇ m / an AD layer having a thickness of 4 ⁇ m / thickness.
  • a 100 ⁇ m LLDPE layer film is used, and as the second film layer, the LLDPE layer having a thickness of 100 ⁇ m / the AD layer having a thickness of 4 ⁇ m / the EVOH layer having a thickness of 10 ⁇ m / the AD layer having a thickness of 4 ⁇ m / the LLDPE layer having a thickness of 30 ⁇ m / thickness.
  • a container body constituent sheet material was produced in the same manner as in Example 1 except that a film of a 15 ⁇ m LDPE layer / a 12 ⁇ m thick biaxially stretched PET layer was used.
  • This film includes a co-extruded LLDPE layer having a thickness of 30 ⁇ m, an AD layer having a thickness of 4 ⁇ m, an EVOH layer having a thickness of 10 ⁇ m, an AD layer having a thickness of 4 ⁇ m, and an LLDPE layer having a thickness of 100 ⁇ m, and a biaxially stretched PET film having a thickness of 12 ⁇ m. It is an extruded film formed by melt-extruding LDPE with a thickness of 15 ⁇ m between the two. An anchor coat layer was provided in advance on one side (melt-extruded surface of LDPE) of the biaxially stretched PET film.
  • Example 9 As the first film layer, a coextruded film of an LLDPE layer having a thickness of 18 ⁇ m, an AD layer having a thickness of 4 ⁇ m, an EVOH layer having a thickness of 6 ⁇ m, an AD layer having a thickness of 4 ⁇ m, and an LLDPE layer having a thickness of 18 ⁇ m was used in this order from the outside, and a second film layer was used.
  • Example 2 As described in Example 1, except that a co-extruded film of an LLDPE layer having a thickness of 18 ⁇ m, an AD layer having a thickness of 4 ⁇ m, an EVOH layer having a thickness of 6 ⁇ m, an AD layer having a thickness of 4 ⁇ m, and an LLDPE layer having a thickness of 18 ⁇ m was used in this order from the outside. In the same manner, a container body constituent sheet material was produced.
  • a transparent vapor-deposited biaxially stretched PET layer having a thickness of 12 ⁇ m / a Dry layer / an LLDPE layer having a thickness of 18 ⁇ m / an AD layer having a thickness of 4 ⁇ m / an EVOH layer having a thickness of 6 ⁇ m / an AD layer having a thickness of 4 ⁇ m / a thickness of 18 ⁇ m.
  • the LLDPE layer having a thickness of 18 ⁇ m, the AD layer having a thickness of 4 ⁇ m, the EVOH layer having a thickness of 6 ⁇ m, the AD layer having a thickness of 4 ⁇ m, and the LLDPE layer having a thickness of 18 ⁇ m were coextruded from the outside.
  • a container body constituent sheet material was produced in the same manner as in Example 1 except that a film was used.
  • a coextruded film was used as the LLDPE layer / AD layer / EVOH layer / AD layer / LLDPE layer of the first film layer.
  • the first film layer was produced by laminating a transparent vapor-deposited biaxially stretched PET film on the co-extruded film via a dry laminate adhesive (Dry).
  • Example 11 As the first film layer, in order from the outside, a biaxially stretched LLDPE layer having a thickness of 40 ⁇ m / an LDPE layer having a thickness of 15 ⁇ m / an LLDPE layer having a thickness of 18 ⁇ m / an AD layer having a thickness of 4 ⁇ m / an EVOH layer having a thickness of 6 ⁇ m / an AD layer having a thickness of 4 ⁇ m / thickness.
  • a film of 18 ⁇ m LLDPE layer is used, and as the second film layer, the LLDPE layer having a thickness of 18 ⁇ m / the AD layer having a thickness of 4 ⁇ m / the EVOH layer having a thickness of 6 ⁇ m / the AD layer having a thickness of 4 ⁇ m / the LLDPE layer having a thickness of 18 ⁇ m are used together.
  • a container body constituent sheet material was produced in the same manner as in Example 1 except that an extruded film was used.
  • the first film layer used in Example 11 has a thickness of 40 ⁇ m instead of the transparent vapor-deposited biaxially stretched PET layer (transparent vapor-deposited biaxially stretched PET film) having a thickness of 12 ⁇ m in Example 10.
  • this biaxially stretched LLDPE film Using an axially stretched LLDPE layer (biaxially stretched LLDPE film), this biaxially stretched LLDPE film and an 18 ⁇ m thick LLDPE layer / 4 ⁇ m thick AD layer / 6 ⁇ m thick EVOH layer / 4 ⁇ m thick AD layer / 18 ⁇ m thick LLDPE It is an extruded film formed by melt-extruding LDPE to a thickness of 15 ⁇ m between the layer and the co-extruded film.
  • a laminated film of a 20 ⁇ m-thick LLDPE layer / Dry layer / 12 ⁇ m-thick biaxially stretched EVOH layer / Dry layer / 25 ⁇ m-thick LLDPE layer was used in this order from the outside, and as the second film layer, from the outside.
  • a laminated film of a 25 ⁇ m-thick LLDPE layer / Dry layer / 12 ⁇ m-thick biaxially stretched EVOH layer / Dry layer / 20 ⁇ m-thick LLDPE layer was used in order.
  • a transparent vapor-deposited biaxially stretched PET layer having a thickness of 12 ⁇ m / a Dry layer / an LLDPE layer having a thickness of 20 ⁇ m / a Dry layer / a biaxially stretched EVOH layer having a thickness of 12 ⁇ m / a Dry layer / an LLDPE layer having a thickness of 25 ⁇ m.
  • a laminated film of a 25 ⁇ m-thick LLDPE layer / Dry layer / 12 ⁇ m-thick biaxially stretched EVOH layer / Dry layer / 20 ⁇ m-thick LLDPE layer was used.
  • Examples 7 and 8 As the inner container constituent sheet material, an LLDPE layer with a thickness of 25 ⁇ m / a Dry layer / a transparent vapor-deposited biaxially stretched PET layer with a thickness of 12 ⁇ m / a Dry layer / a biaxially stretched Ny layer with a thickness of 15 ⁇ m / an LLDPE with a thickness of 50 ⁇ m. A layer of film was prepared. The inner container constituent sheet material was formed into a shape as shown in FIG. On the other hand, the first film layer and the second film layer of Example 7 are each formed into a shape as shown in FIG. 23, and both are overlapped and heat-sealed at a portion other than the non-joint portion, so that FIG. 24 shows.
  • a container body constituent sheet material as shown was prepared.
  • the inner container constituent sheet material is superposed on the container body constituent sheet material, and the peripheral edge portion of the container body constituent sheet material (exposed LLDPE layer of the first film layer) and the peripheral edge portion of the inner container constituent sheet material (LLDPE layer) are heated. It was joined with a seal.
  • air is introduced as a filler into the sealing portion (non-joining portion) from the introduction port (air pressure 40 kPa), and the material is introduced in that state.
  • air pressure 40 kPa air pressure 40 kPa
  • Example 9 and Comparative Example 11 As the inner container constituent sheet material, an LLDPE layer / Dry layer with a thickness of 25 ⁇ m / a transparent vapor-deposited biaxially stretched PET layer with a thickness of 12 ⁇ m / a Dry layer / a biaxially stretched Ny layer with a thickness of 15 ⁇ m / a thickness of 50 ⁇ m. LLDPE layer film was prepared. The inner container constituent sheet material was formed into a shape as shown in FIG. On the other hand, the first film layer and the second film layer of Example 9 are each formed into a shape as shown in FIG. 7, and both are overlapped and heat-sealed at a portion other than the non-joint portion, whereby FIG. A container body constituent sheet material as shown was prepared.
  • the inner container constituent sheet material is superposed on the container body constituent sheet material, and the peripheral edge portion of the container body constituent sheet material (LLDPE layer of the second film layer) and the peripheral edge portion of the inner container constituent sheet material (LLDPE layer) are heat-sealed. Joined. After bending the sheet material for the main body of the container with an inner container and heat-sealing the peripheral edges thereof, air is introduced as a filler into the sealing portion (non-joining portion) from the introduction port (air pressure 40 kPa), and the material is introduced in that state. By heat-sealing and closing the mouth, a sheet material container having a container body and an inner container as shown in FIG. 13 was produced. The first film layer and the second film layer of Comparative Example 11 were also processed into a sheet material container having a container body and an inner container as shown in FIG. 13 in the same manner as in Example 9.
  • Example 10 and Comparative Example 12 As the inner container constituent sheet material, an LLDPE layer / Dry layer having a thickness of 25 ⁇ m / a transparent vapor-deposited biaxially stretched PET layer having a thickness of 12 ⁇ m / a Dry layer / a biaxially stretched Ny layer having a thickness of 15 ⁇ m / a thickness of 50 ⁇ m. LLDPE layer film was prepared. The inner container constituent sheet material was formed into a shape as shown in FIG. 16 (a). On the other hand, the first film layer and the second film layer of Example 10 are each formed into a shape as shown in FIG. 14, and both are overlapped and the joint portion is heat-sealed to form a container as shown in FIG. A main body constituent sheet material was produced.
  • the inner container constituent sheet material is superposed on the container body constituent sheet material, and the peripheral edge portion of the container body constituent sheet material (LLDPE layer of the second film layer) and the peripheral edge portion of the inner container constituent sheet material (LLDPE layer) are heat-sealed.
  • a container body constituent sheet material with an inner container as shown in FIG. 16 (b).
  • air is introduced into the sealing portion from the introduction port as a filler (air pressure 40 kPa), and the introduction port is heat-sealed in that state.
  • air pressure 40 kPa air pressure 40 kPa
  • Example 11 a coextruded film of an LLDPE layer having a thickness of 50 ⁇ m, an AD layer having a thickness of 4 ⁇ m, an EVOH layer having a thickness of 6 ⁇ m, an AD layer having a thickness of 4 ⁇ m, and an LLDPE layer having a thickness of 50 ⁇ m was used as the inner container constituent sheet material.
  • a container body constituent sheet material with an inner container was prepared in the same manner as in Example 10 except that the first film layer and the second film layer of Example 11 were used, and the container body and the inner container as shown in FIG. 20 were prepared.
  • a sheet material container having the above was prepared.
  • the first film layer used in Example 10 was a transparent vapor-deposited biaxially stretched PET layer having a thickness of 12 ⁇ m and a co-extruded film (LLDPE layer having a thickness of 18 ⁇ m / AD layer having a thickness of 4 ⁇ m / EVOH layer having a thickness of 6 ⁇ m / AD layer having a thickness of 4 ⁇ m.
  • LLDPE layer with a thickness of 18 ⁇ m is laminated using a dry laminate adhesive (Dry layer).
  • MD direction and TD direction were measured.
  • the tensile elongation in the MD direction of the coextruded film of Example 10 was about 360%, and the tensile elongation in the TD direction was about 420%.
  • the second film layer of Example 10 is the same as the coextruded film whose tensile elongation was measured.
  • the co-extruded film of Example 11 is also the same as the co-extruded film whose tensile elongation was measured.
  • the first film layer used in Comparative Example 12 was a transparent vapor-deposited biaxially stretched PET layer having a thickness of 12 ⁇ m and a laminated film (LLDPE layer / Dry layer having a thickness of 20 ⁇ m / biaxially stretched EVOH layer having a thickness of 12 ⁇ m / Dry layer / thickness 25 ⁇ m.
  • This is a laminated film in which an LLDPE layer) is bonded using a dry-laminated adhesive (Dry layer).
  • the laminated film (LLDPE layer having a thickness of 20 ⁇ m / Dry layer / biaxially stretched EVOH layer having a thickness of 12 ⁇ m / Dry layer / LLDPE layer having a thickness of 25 ⁇ m) in the MD direction and Each tensile elongation in the TD direction was measured.
  • the tensile elongation in the MD direction of the laminated film of Comparative Example 12 was about 110%, and the tensile elongation in the TD direction was about 88%.
  • the second film layer of Comparative Example 12 is the same as the laminated film whose tensile elongation was measured.
  • the tensile elongation in the MD direction was measured by the following procedure. From the films of Example 10 and Comparative Example 12, test pieces having a length in the MD direction of 200 mm and a length in the TD direction of 15 mm were cut out. Set the test piece on the measuring instrument Autograph (manufactured by Shimadzu Corporation: AG-X plus 500N) (distance between chucks: 50 mm), pull it under standard conditions at a tensile speed of 300 mm / min, and until the test piece breaks. It was stretched in the MD direction, and the length of the test piece before the test and the length of the test piece when the test piece was broken were measured. By substituting the length into the following equation, the tensile elongation in the MD direction was calculated.
  • the tensile elongation in the TD direction was calculated in the same manner as the procedure of the tensile test in the MD direction (that is, the procedure for measuring the tensile elongation in the TD direction is "MD" in the procedure of the tensile test in the MD direction. Is read as “TD” and "TD” is read as “MD”).
  • Tensile elongation (%) 100 ⁇ (L-L0) / L0.
  • L in the above formula represents the length of the test piece in the MD direction (or TD direction) before the test
  • L0 represents the length of the test piece in the MD direction (or TD direction) at the time of breaking.

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JPWO2021049385A1 (enExample) 2021-03-18

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