Laminated body for laminated tube and laminated tube container

Abstract

To provide a laminate for a laminate tube for producing a laminate tube having high barrier properties and being easily recycled.SOLUTION: There is provided a laminate for a laminated tube, in which at least a sealant layer, a barrier layer, and a substrate layer are laminated in this order, in which the sealant layer and the substrate layer are formed as outermost layers on both sides of the laminate for a laminated tube, respectively. The sealant layer and the substrate layer are polyolefin-based resin layers formed from polyolefin-based resin 1, and the barrier layer is a vapor-deposited film in which an inorganic substance or an inorganic oxide is vapor-deposited on a substrate film formed from polyolefin-based resin 2.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a laminate for a laminate tube and a laminate tube container. [Background technology]

[0002] A laminated body for a laminated tube is known, which is a laminate of a resin layer such as polyethylene and a barrier layer. From the viewpoint of reducing the amount of water vapor and oxygen transmitted from the outside and blocking light, a metal foil is used for the barrier layer.

[0003] For example, Patent Document 1 discloses a raw sheet for a light-shielding laminated tube having an intermediate layer made of a metal material.

[0004] Furthermore, as a known barrier material other than metal materials, Patent Document 2 discloses an oxygen barrier layer made of an ethylene-vinyl alcohol copolymer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-209630 [Patent Document 2] International Publication No. 2019 / 230929 Summary of the Invention [Problem to be solved by the invention]

[0006] In recent years, there has been a demand for containers that can be easily recycled. To facilitate recycling, mono-material containers made from a single resin have been proposed. Mono-material containers are also required to have barrier properties. Here, "barrier properties" refers to the ability to block gases, moisture, odors, light, etc.

[0007] If a metal material such as that described in Patent Document 1 is used for the barrier layer, the barrier properties are improved, but recycling becomes difficult. Furthermore, when a resin material such as that described in Patent Document 2 is used for the barrier layer, recycling becomes easier, but the barrier properties are lower than when a metal material is used.

[0008] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a laminate for a laminate tube for producing a laminate tube having high barrier properties and being easily recyclable. Another object of the present invention is to provide a laminate tube having high barrier properties and being easily recyclable. [Means for solving the problem]

[0009] That is, the present invention employs the following configuration. [1] A laminate for a laminate tube, comprising at least a sealant layer, a barrier layer, and a base layer laminated in this order, the sealant layer and the base layer being formed as the outermost layers on both sides of the laminate for a laminate tube, respectively, the sealant layer and the base layer being polyolefin-based resin layers formed from polyolefin-based resin 1, and the barrier layer being a vapor-deposited film in which an inorganic substance or an inorganic oxide is vapor-deposited onto a base film formed from polyolefin-based resin 2. [2] The laminate for a laminate tube according to [1], wherein the barrier layer is a vapor-deposited film in which aluminum is vapor-deposited on the base film. [3] The laminate for a laminate tube according to [1] or [2], wherein the polyolefin resin 1 is a polyethylene resin. [4] A laminated tube container using the laminate for a laminated tube according to any one of [1] to [3]. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a laminate for a laminate tube for producing a laminate tube having high barrier properties and being easily recycled. Furthermore, according to the present invention, it is possible to provide a laminate tube having high barrier properties and being easily recycled. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of a cross section of an example of a laminate for a laminate tube according to the present embodiment. [Figure 2] 1 is a schematic diagram of an example of a laminated tube container according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] In the present invention, the laminate for a laminate tube is judged to be easily recyclable when the content of polyolefin resin relative to the total amount of the laminate for a laminate tube is 90% by weight or more.

[0013] In the present invention, whether or not the barrier property is high is evaluated by measuring the water vapor permeation rate and oxygen permeation rate of the laminate for a laminate tube.

[0014] [Method for measuring water vapor permeability] Water vapor permeability is 1m 2 The water vapor permeation rate measured under conditions of a temperature of 40°C and a humidity of 100% is 1.0 cc / m 2 ·day·atm or less is considered to have "high water vapor barrier properties." 2 If the humidity is below 100°C / day, it is evaluated as having "higher water vapor barrier properties."

[0015] [Method for measuring oxygen permeability] The oxygen permeability is 2 The oxygen permeability measured under conditions of a temperature of 40°C and a humidity of 100% is 10.0 g / m 2 If the oxygen barrier strength is less than 1.0 g / m 2 If the test result is 0.5 days or less, it is evaluated as having "higher oxygen barrier properties."

[0016] In the present invention, when the rigidity of the laminate for a laminate tube is evaluated, it is evaluated by measuring the loop stiffness shown below.

[0017] [Method of measuring loop stiffness] The rigidity of the laminate for a laminate tube is evaluated by loop stiffness. Loop stiffness is an index representing the rigidity of a film. The larger the loop stiffness value, the higher the rigidity of the film. Specifically, a loop is formed using a film cut into a strip of predetermined size, and the repulsive force of the loop is measured while the loop is crushed by a predetermined amount in the radial direction.

[0018] In this embodiment, a ring with a circumference of 80 mm is made using a sample (width 15 mm × length 150 mm), and a force is applied from above the ring at a speed of 3.3 mm / sec until the distance of the minor axis of the sample becomes 15 mm. This state is maintained for 5 seconds, and the repulsive force (mN / 15 mm) of the sample is measured. For the measurement, a loop stiffness tester manufactured by Toyo Seiki Seisakusho, Ltd. is used.

[0019] Generally, the flow direction (MD direction; Machine Direction) of the laminated tube laminate coincides with the left-right direction when the laminated tube container is standing upright, and the direction perpendicular to the flow direction of the laminated tube laminate (TD direction; Transverse Direction) coincides with the up-down direction when the laminated tube container is standing upright.

[0020] In this embodiment, the loop stiffness is measured in both the machine direction (MD) and the transverse direction (TD) of the laminate for a laminate tube. A sample is evaluated as having "high rigidity" when the average value of three loop stiffnesses in the MD direction is 500 mN / 15 mm or more, and when the average value of three loop stiffnesses in the TD direction is 600 mN / 15 mm or more.

[0021] <Laminate for laminated tubes> 1 shows a schematic cross-sectional view of a laminate 1 for a laminate tube according to this embodiment. Hereinafter, the "laminate 1 for a laminate tube" will be abbreviated as "laminate 1" for explanation. The laminate 1 is a laminate in which a base layer 11, a barrier layer 12, and a sealant layer 13 are laminated in this order.

[0022] The base material layer 11 and the sealant layer 13 are respectively formed as the outermost layers on both sides of the laminate 1. In other words, the surface 11a of the base material layer 11 opposite to the surface in contact with the barrier layer 12 is one of the outermost surfaces of the laminate 1, and the surface 13a of the sealant layer 13 opposite to the surface in contact with the barrier layer 12 is the other outermost surface of the laminate 1.

[0023] The laminate 1 allows a laminate tube container to be easily produced by a conventionally known method. Specifically, the laminate 1 is rolled up, and the surface 11a of the base layer and the surface 13a of the sealant layer of the laminate 1 are overlapped. The overlapping ends are welded to form a welded portion, thereby producing a cylindrical body portion. This cylindrical body portion becomes the body portion of the laminated tube container. A more detailed method for manufacturing the laminated tube container will be described later.

[0024] Each layer constituting the laminate 1 will be described.

[0025] ≪Base material layer 11≫ The substrate layer 11 is a polyolefin resin layer formed from a polyolefin resin 1. Examples of the polyolefin resin 1 include polyolefin resins such as low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), uniaxially oriented high-density polyethylene (HDPE), ethylene-vinyl acetate copolymer, polypropylene, and cyclic olefin resin.

[0026] From the viewpoint of easy recycling, the polyolefin resin 1 is preferably a polyethylene resin such as low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), uniaxially oriented high-density polyethylene (HDPE), or ethylene-vinyl acetate copolymer.

[0027] The thickness of the base layer 11 is not particularly limited, but may be, for example, about 20 to 200 μm, or may further be about 25 to 170 μm.

[0028] The substrate layer 11 may be a single layer or a multilayer. When the base layer 11 is a single layer, the film of the polyolefin resin 1 described above may be laminated by dry lamination.

[0029] When the base layer 11 is multi-layered, it may be formed by dry lamination or extrusion lamination.

[0030] Alternatively, the multi-layer substrate layer 11 may be formed by a process of extrusion laminating the materials constituting the substrate layer, or by a process of performing both extrusion lamination and dry lamination. The multi-layer substrate layer 11 is, for example, extruded polyolefin / polyolefin film / extruded polyolefin from the outermost layer side.

[0031] A highly rigid laminate tube can be manufactured by using a uniaxially oriented high-density polyethylene (HDPE) film as the constituent material of the base layer 11. The thickness of the uniaxially oriented high-density polyethylene (HDPE) is not particularly limited, but can be appropriately selected within the range of 15 μm to 50 μm.

[0032] The total thickness of the base layer 11 may be adjusted appropriately within the range of 120 μm or more and 250 μm or less.

[0033] <Barrier layer> The barrier layer 12 is a vapor-deposited film in which an inorganic substance or an inorganic oxide is vapor-deposited onto a base film 12a formed from a polyolefin-based resin 2. The vapor-deposited film is composed of a base film and a film 12b of an inorganic substance or an inorganic oxide.

[0034] The film 12b may be formed on both sides or one side of the base film 12a. When formed on one side, it may be on the base layer 11 side of the base film 12a or on the sealant layer 13 side. In the laminate 1 shown in FIG. 1, for example, the barrier layer 12 has the film 12b on the base layer 11 side.

[0035] As the vapor-deposited film, for example, a vapor-deposited film in which an inorganic substance such as silicon (Si), aluminum (Al), or titanium (Ti) or an inorganic oxide thereof is vapor-deposited onto a substrate film can be used.

[0036] The substrate film of the vapor-deposited film can be a film of polyolefin resin 2. As the polyolefin resin 2, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), ethylene-vinyl acetate copolymer, polypropylene, cyclic olefin resin, etc. can be used.

[0037] From the viewpoint of further enhancing the barrier property, it is preferable to use an ethylene-vinyl acetate copolymer film as the substrate film.

[0038] In particular, it is preferable to use a vapor-deposited film in which aluminum is vapor-deposited or a vapor-deposited film in which aluminum oxide is vapor-deposited.

[0039] The thickness of the inorganic substance or inorganic oxide film varies depending on the type of inorganic substance or inorganic oxide used, but from the viewpoint of improving barrier properties and facilitating recycling, it is preferably 50 to 2000 Å, and is preferably selected arbitrarily within the range of about 100 to 1000 Å.

[0040] In particular, in the case of a vapor-deposited film in which aluminum is vapor-deposited, the thickness of the aluminum layer is preferably 50 to 600 Å, and more preferably 100 to 450 Å.

[0041] Examples of methods for forming a vapor-deposited film include physical vapor deposition (PVD) methods such as vacuum deposition, sputtering, and ion plating, and chemical vapor deposition (CVD) methods such as plasma chemical vapor deposition, thermal chemical vapor deposition, and photochemical vapor deposition.

[0042] When the barrier layer 12 is formed using a vapor-deposited film, the thickness of the barrier layer 12 is preferably 10 μm or more and 30 μm or less, and more preferably 12 μm or more and 25 μm or less.

[0043] When the barrier layer 12 is formed using a vapor-deposited film, the ratio of the thickness of the barrier layer 12 to the total thickness of the laminate 1 is preferably 1% to 10%, more preferably 3% to 8%.

[0044] As the vapor-deposited film for forming the barrier layer 12, an aluminum-deposited polyethylene film or an aluminum-deposited biaxially oriented polypropylene film is preferred.

[0045] <Sealant layer> The material for forming the sealant layer 13 can be the same polyolefin resin 1 as the material for forming the above-mentioned base layer 11. The sealant layer 13 may be a single layer or multiple layers. The total thickness of the sealant layer 13 may be adjusted appropriately within the range of 50 μm to 200 μm.

[0046] <<Any Layer>> The laminate 1 may have a print layer or an adhesive layer as an optional layer.

[0047] (Printing layer) The printed layer can be formed by printing ink in a solid or patterned manner using a printing method such as gravure printing, letterpress printing, offset printing, screen printing, or inkjet printing. The thickness of the printed layer is not particularly limited, but may be about 0.5 to 10 μm. The printed layer may be formed over the entire surface of the laminate, or may be formed on a portion of the surface of the laminate. Two or more printed layers may be superimposed.

[0048] The ink for forming the printing layer may contain a coloring material such as a pigment or dye, and a binder. Examples of binders include, but are not limited to, polyamide, polyurethane, polyester, polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, acrylic polymer, polybutadiene, and cyclized rubber. The ink may contain a solvent such as water, an organic solvent, or vegetable oil.

[0049] (adhesive layer) The laminate 1 may be produced by extrusion lamination or dry lamination using an adhesive. When produced by dry lamination, an adhesive layer is provided. The adhesive layer may be formed from an adhesive or an anchor coating agent. Materials for forming the adhesive layer are not particularly limited, but include urethane compounds, epoxy compounds, isocyanate compounds, polyethyleneimine, and organic titanium compounds such as titanium alkoxide. The thickness of the adhesive layer may be, for example, about 0.1 to 10 μm, about 1 to 6 μm, or about 3 to 4 μm.

[0050] <Layer configuration> An example of the layer structure of the laminate 1 is described below. Example 1: Substrate layer / barrier layer / sealant layer Example 2: Base layer / printing layer / adhesive layer / barrier layer / adhesive layer / sealant layer Example 3: Substrate layer / barrier layer / adhesive layer / sealant layer

[0051] <Method of manufacturing laminate> The method for producing the laminate 1 is not particularly limited, but examples thereof include dry lamination, extrusion lamination, and co-extrusion.

[0052] <Laminated tube container> FIG. 2 is a schematic diagram of the laminated tube container of this embodiment. The laminated tube container 2 shown in FIG. 2 includes a body portion 21, a seal portion 22, an end seal portion 23, a pouring member 24, and a cap member 25.

[0053] The body portion 21 has a substantially circular shape. The body portion 21 is a laminated molded body of the laminate 1. The body portion 21 is obtained by rolling the laminate 1 into a cylindrical shape, overlapping opposing ends, and joining them together by heat sealing. Therefore, the body portion 21 has a seal portion 22 where the laminates 1 are joined together along the longitudinal direction.

[0054] When one end of the body portion 21 is joined together by heat sealing, an end seal portion 23 is formed. A pouring member 24 for pouring the contents out of the laminated tube container and a cap member 25 for sealing the contents are attached to the opening at the other end of the body 21.

[0055] <Application> The laminated tube container according to the present invention can be used as a packaged product by filling it with contents, such as toothpaste, cosmetics, glue, mustard paste, wasabi paste, cream, paint, ointment, medicine, and other conventionally known products.

[0056] The laminated tube container of the present invention has high barrier properties when filled with such contents, and can be easily recycled after the contents have been consumed. [Example]

[0057] The present invention will be explained in more detail below using examples, but the present invention is not limited to these examples.

[0058] Example 1 A laminate 10 was obtained in which the base film, the barrier film, and the sealant film were laminated in this order.

[0059] The base film is a film in which a polyethylene layer having a thickness of 60 μm is formed on one side of a polyethylene film having a thickness of 60 μm. The barrier film is an aluminum-coated polyethylene film with a thickness of 25 μm. The sealant film is a polyethylene film with a thickness of 100 μm.

[0060] Specifically, LLDPE was extruded to a thickness of 30 μm on both sides of a barrier film, and a base film, a barrier film, and a sealant film were laminated in this order.

[0061] The laminate 10 had a three-layer base material layer and a two-layer sealant layer. The base layer comprises, from the outermost layer, a 60 μm thick polyethylene layer, a 60 μm thick polyethylene film, and a 30 μm thick LLDPE layer. The sealant layer comprises a 100 μm thick polyethylene film and a 30 μm thick LLDPE layer from the outermost layer.

[0062] The total thickness of the laminate 10 was 305 μm, and the thickness of the barrier layer was 25 μm. It was confirmed that the laminate 10 is easily recyclable because the laminate 10 is made of polyethylene except for the aluminum vapor deposition film. The water vapor permeability of the laminate 10 is 0.5 cc / m 2 ·day·atm, and the oxygen permeability is 66.5g / m 2 ·day.

[0063] The laminate 10 used an aluminum-deposited polyethylene film as a barrier layer, and therefore had improved barrier properties and was highly recyclable.

[0064] <Example 2> A laminate 11 was obtained in the same manner as in Example 1, except that an aluminum-deposited biaxially stretched polypropylene film having a thickness of 25 μm was used as the barrier film.

[0065] The total thickness of the laminate 11 was 305 μm, and the thickness of the barrier layer was 25 μm. It was confirmed that the laminate 11 is easily recyclable because the parts other than the aluminum vapor deposition are made of polyolefin. The water vapor permeation rate (average value of two measurements) of the laminate 11 is 0.3 cc / m 2 ·day·atm, and the oxygen permeability (average of two measurements) was 6.45g / m 2 ·day.

[0066] The laminate 11 used an aluminum-deposited biaxially oriented polypropylene film for the barrier layer, and therefore had improved barrier properties and high recyclability.

[0067] Example 3 A laminate 12 was obtained in the same manner as in Example 1, except that a commercially available aluminum-deposited ethylene vinyl alcohol film having a thickness of 12 μm was used as the barrier film.

[0068] The total thickness of the laminate 12 was 292 μm, and the thickness of the barrier layer was 12 μm. It was confirmed that the laminate 12 is easily recyclable because the aluminum vapor-deposited ethylene vinyl alcohol film accounts for approximately 5% by weight of the laminate 12. The water vapor permeation rate (average value of two measurements) of the laminate 12 is 0.9 cc / m 2 ·day·atm, and the oxygen permeability (average of two measurements) is 0.1g / m 2 ·day.

[0069] The laminate 12 used an aluminum-deposited ethylene vinyl alcohol film as a barrier layer, and therefore had improved barrier properties and was highly recyclable.

[0070] Example 4 The substrate film was obtained by laminating, in this order, a 50 μm thick polyethylene layer, an 80 μm thick high-rigidity polyethylene film layer (loop stiffness 39 mN / 15 mm in MD direction, 50 mN / 15 mm in TD direction), a 20 μm thick LLDPE layer, and a 25 μm thick uniaxially oriented HDPE film layer. A print layer was formed by gravure printing on the surface of the base film opposite to the surface where the uniaxially stretched HDPE film layer was in contact with the LLDPE layer. The barrier film used was an aluminum-deposited biaxially oriented polypropylene film with a thickness of 18 μm. The sealant film used was a commercially available polyethylene film with a thickness of 150 μm.

[0071] The substrate film, the barrier film, and the sealant film were dry laminated using an adhesive to obtain a laminate 13.

[0072] The laminate 13 is a laminate including a base layer, a printing layer, an adhesive layer, a barrier layer, another adhesive layer, and a sealant layer in this order. The base layer is made up of four layers, and the sealant layer is made up of one layer. The base material layer comprises, from the outermost layer, a 50 μm thick polyethylene layer, an 80 μm thick high-rigidity polyethylene film, a 20 μm thick LLDPE layer, and a 25 μm thick uniaxially oriented HDPE film layer.

[0073] The total thickness of the laminate 13 was 343 μm, and the thickness of the barrier layer was 18 μm. It was confirmed that the laminate 13 is easy to recycle because the aluminum vapor deposition film and adhesive layer account for approximately 2% by weight of the laminate 13. The water vapor permeation rate (average value of two measurements) of the laminate 13 is 0.075 cc / m 2 ·day·atm, and the oxygen permeability (average of two measurements) is 4.5g / m 2 ·day. The loop stiffness of the laminate 13 was 839 mN / 15 mm in the MD direction and 950 mN / 15 mm in the TD direction.

[0074] The laminate 13 had improved barrier properties and high recyclability because it used an aluminum-deposited biaxially oriented polypropylene film for the barrier layer. In addition, the rigid film provided as the base layer gave it high rigidity.

[0075] <Example 5> As a substrate film, a film was prepared in which a 40 μm thick polyethylene layer was formed on one side of a 120 μm thick high-rigidity polyethylene film (loop stiffness 39 mN / 15 mm in MD direction, 50 mN / 15 mm in TD direction). The barrier film used was an aluminum-deposited biaxially oriented polypropylene film with a thickness of 18 μm. The sealant film used was a commercially available polyethylene film with a thickness of 100 μm.

[0076] LLDPE was extruded onto one side of the barrier film to a thickness of 20 μm, and the base film and barrier film were laminated together. Thereafter, a sealant film was dry-laminated using an adhesive onto the surface of the barrier film opposite to the surface in contact with the base film, thereby obtaining a laminate 14.

[0077] The laminate 14 is a laminate including a base layer, a barrier layer, an adhesive layer, and a sealant layer in this order. The base layer is made up of three layers, and the sealant layer is made up of one layer. The base layer comprises, from the outermost layer, a 40 μm thick polyethylene layer, a 120 μm thick high-rigidity polyethylene film, and a 20 μm thick LLDPE layer.

[0078] The total thickness of the laminate 14 was 298 μm, and the thickness of the barrier layer was 18 μm. It was confirmed that the laminate 14 is easy to recycle because the aluminum vapor deposition film and adhesive layer account for approximately 1% by weight of the laminate 14. The water vapor permeation rate (average value of two measurements) of the laminate 14 is 0.3 cc / m 2 ·day·atm, and the oxygen permeability (average of two measurements) is 6.5g / m 2 ·day. The loop stiffness of the laminate 14 was 551 mN / 15 mm in the MD direction and 689 mN / 15 mm in the TD direction.

[0079] The laminate 14 had improved barrier properties and high recyclability due to the use of an aluminum-deposited polyethylene film as the barrier layer. In addition, the substrate layer was provided with a rigid film, so the laminate 14 also had high rigidity.

[0080] <Comparative Example 1> A 7 μm thick aluminum foil and a 12 μm thick polyethylene terephthalate film with a printed layer formed thereon were dry laminated using an adhesive to form a barrier film material. Polyethylene was melt-extruded onto both sides of the barrier film material to obtain a laminate 20 comprising a base layer having a thickness of 100 μm and a sealant layer having a thickness of 100 μm. The laminate 20 had, in this order, a 100 μm thick substrate layer, a 12 μm thick polyethylene terephthalate layer on which a print layer was formed, a 7 μm thick aluminum metal foil layer, and a 100 μm thick sealant layer.

[0081] The total thickness of the laminate 20 was 219 μm, and the thickness of the barrier layer was 19 μm. It was confirmed that the laminate 20 is difficult to recycle because the aluminum foil and polyethylene terephthalate film account for approximately 16% by weight of the laminate 20. The water vapor permeability of the laminate 20 is 0 cc / m 2 ·day·atm, and the oxygen permeability is 0g / m 2 ·day.

[0082] <Comparative Example 2> A laminate 21 was obtained in the same manner as in Comparative Example 1, except that the 7 μm thick aluminum foil was replaced with a 12 μm thick aluminum-deposited polyethylene terephthalate film. The laminate 21 had, in this order, a 100 μm thick base layer, a 12 μm thick polyethylene terephthalate layer on which a print layer was formed, a 12 μm thick aluminum-deposited polyethylene terephthalate layer, and a 100 μm thick sealant layer.

[0083] The total thickness of the laminate 21 was 224 μm, and the thickness of the barrier layer was 12 μm. It was confirmed that laminate 21 is difficult to recycle because the polyethylene terephthalate film accounts for approximately 15% by weight of laminate 21. The water vapor permeability of the laminate 21 is 0.8 cc / m 2 ·day·atm, and the oxygen permeability is 3.2g / m 2 ·day. The loop stiffness of the laminate 21 was 1032 mN / 15 mm in the MD direction and 1083 mN / 15 mm in the TD direction.

[0084] <Comparative Example 3> A laminate 22 was obtained by laminating polyethylene having a thickness of 100 μm on both sides of ethylene vinyl alcohol having a thickness of 25 μm by coextrusion. The laminate 22 had a base layer having a thickness of 100 μm, an ethylene vinyl alcohol layer having a thickness of 25 μm, and a sealant layer having a thickness of 100 μm, in that order.

[0085] The total thickness of the laminate 22 was 225 μm, and the thickness of the barrier layer was 25 μm. It was confirmed that the ethylene vinyl alcohol layer of the laminate 22 accounts for approximately 14% by weight of the laminate 22, making it difficult to recycle. The water vapor permeability of the laminate 22 is 1.1 cc / m 2 ·day·atm, and the oxygen permeability is 0.9g / m 2 ·day.

[0086] Although Comparative Examples 1 and 2 had high barrier properties, the polyolefin resin content of the laminate was less than 90% by weight, and they were evaluated as being difficult to recycle. In Comparative Example 3, the polyolefin resin content of the laminate was less than 90% by weight, and it was evaluated as being difficult to recycle, and furthermore, the water vapor barrier property was low. [Explanation of symbols]

[0087] 1: laminate for laminate tube, 2: laminate tube container, 11: base layer, 11a: surface, 12: barrier layer, 12a: base film, 12b: membrane, 13: sealant layer, 13a: surface, 21: body portion, 22: seal portion, 23: end seal portion, 24: pouring member, 25: cap member

Claims

1. A laminate for a laminated tube, comprising at least a sealant layer, a barrier layer, and a substrate layer laminated in this order, the sealant layer and the base material layer are formed as outermost layers on both sides of the laminate for a laminated tube, the sealant layer and the base layer are polyolefin-based resin layers formed from polyolefin-based resin 1, The barrier layer is a vapor-deposited film formed by vapor-depositing an inorganic substance or an inorganic oxide onto a substrate film formed from a polyolefin-based resin (2).

2. 2. The laminate for a laminate tube according to claim 1, wherein the barrier layer is a vapor-deposited film formed by vapor-depositing aluminum onto the base film.

3. 3. The laminate for a laminate tube according to claim 1, wherein the polyolefin resin 1 is a polyethylene resin.

4. A laminated tube container using the laminate for a laminated tube according to claim 1 or 2.

Images