Laminate and tube container

Abstract

To provide a laminate for a tube container capable of suppressing an exposure of a paper substrate even if a trunk of a tube container is bent, and also to provide a tube container using such a laminate.SOLUTION: A laminate 10 includes at least a first sealant layer 12, a paper substrate layer 13 and a second sealant layer 15 continuously and sequentially laminated interposing another layer or no other layer. The laminate 10 is to be used for a trunk 31 of a tube container 30. A ratio of thickness of the first sealant layer 12 to thickness of the paper substrate layer 13 is 0.65 or higher.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a laminate for a tube container and a tube container, and more particularly to a laminate and a tube container that suppress paper peeling even when the laminate has a paper base layer. [Background technology]

[0002] Conventionally, laminates used in tube containers have a structure in which a base layer is provided between sealant layers used on the outer and inner surfaces. A resin film is used as the base layer because it satisfies mechanical, physical, chemical and other suitability requirements (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-178851 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, it has been recommended to reduce the amount of resin used in consideration of the environment. In order to reduce the amount of resin used, a paper base material is also used in the laminated body of tube containers. On the other hand, in tube containers, the contents may not be completely dispensed, and some of the contents may remain. In such cases, the user folds the tube-shaped body to dispense the remaining contents. When the body is folded in this way, in tube containers using a paper base material in the laminated body of the body, the paper base material may be exposed from the laminated body near the folded part. There are problems such as the appearance being impaired by the exposed paper base material, and the exposure of the paper base material causing water to enter and peeling between the layers.

[0005] Therefore, an object of the present invention is to provide a laminate for a tube container that can prevent exposure of the paper base material even when the body of the tube container is folded, and a tube container using such a laminate. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides A laminate for use in the body of a tube container, comprising a first sealant layer, a paper base layer, and a second sealant layer, which are laminated in this order, either with or without other layers sandwiched therebetween, The laminate is characterized in that the ratio of the thickness of the first sealant layer to the thickness of the paper base layer is 0.65 or more.

[0007] The laminate of the present invention is The ratio of the thickness of the first sealant layer to the thickness of the paper base layer is 2.0 or less.

[0008] The laminate of the present invention is The ratio of the thickness of the second sealant layer to the thickness of the paper base layer is 0.65 or more.

[0009] The laminate of the present invention is The ratio of the thickness of the second sealant layer to the thickness of the paper base layer is 2.0 or less.

[0010] The laminate of the present invention is The interlaminar strength of the paper base layer is 0.7 N / 15 mm or more.

[0011] The laminate of the present invention is The paper sheet is characterized in that it has a barrier layer between the paper base layer and the second sealant layer.

[0012] The present invention also provides a method for producing a semiconductor device comprising the steps of: The present invention provides a tube container, characterized in that the laminate is used as a body part. Effect of the Invention

[0013] According to the present invention, it is possible to provide a laminate for a tube container that can prevent exposure of a paper base material even when the body of the tube container is folded, and a tube container using such a laminate. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a front view (partial cross-sectional view) of the tube container with the cap attached. [Diagram 2] This is a partial cross-sectional view of a packaged product of a tube container containing a content. [Diagram 3] FIG. 2 is a diagram showing a cylindrical body portion of a tube container according to one embodiment of the present invention. [Figure 4] 1 is a cross-sectional view of a laminate of a body portion of a tube container according to one embodiment of the present invention. [Diagram 5] FIG. 13 is a diagram showing a cross-sectional image of a laminate taken by a microscope. [Figure 6] FIG. 1 shows a test of interlaminar strength of a paper substrate. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these specifically exemplified forms or various specifically described structures. In each drawing, the size and ratio of the members may be changed or exaggerated for ease of understanding. In addition, for ease of viewing, parts that are unnecessary for explanation or repeated reference symbols may be omitted.

[0016] In this specification, the terms "outer surface" and "inner surface" refer to the "outer surface" and "inner surface" when a tube container 30 is produced using the laminate 10. Additionally, the terms "upper side" and "lower side" refer to the side of the mouth 36 when the tube container 30 is held with the mouth 36 and the cap 20 facing upward, and the terms "lower side" refer to the opposite side of the mouth 36 (the 34B side in FIG. 1 and the 39 side in FIG. 2).

[0017] Fig. 1 is a partial cross-sectional view of a tube container according to this embodiment with a cap attached. Fig. 2 is a partial cross-sectional view of a packaged product of a tube container containing a content. As shown in Fig. 1, a tube container 30 according to this embodiment includes a body 31 formed of a laminate 10, and a head molded body 37 produced by providing a synthetic resin to the body 31 by a method such as compression molding or injection molding. The head molded body 37 further includes a shoulder portion 35 and a mouth portion 36. A cap 20 is attached to the mouth portion 36 of the tube container 30.

[0018] The tube container 30 has a head molded body 37 composed of a cylindrical mouth 36 including an opening for discharge, and a truncated cylindrical shoulder 35 connected to the mouth 36 and expanding in circumference toward the lower side. In FIG. 1, the right half shows the front of the head molded body 37, and the left half shows a cross section parallel to the front through the radial center. The hatched portion in the left half of FIG. 1 shows the actual body of the head molded body 37, and the blank portion is a cavity. The shoulder 35 is configured, for example, in a truncated cone shape that expands radially outward of the tube container 30 as it moves away from the mouth 36. For example, the shoulder 35 has an inclination of 30 degrees with respect to the horizontal. The shoulder 35 is connected to the body 31 on the lower side.

[0019] The generally cylindrical mouth 36 has a helical protrusion on its outer surface that functions as a screw thread. The inner circumferential surface of the mouth 36 defines an opening. The opening of the mouth 36 serves as a discharge port for discharging the contents. The contents contained in the body 31 are discharged from the tube container 30 by passing through the opening. The head molded body 37 has the above-described structure, and can be detached by screwing it onto the cap 20 having a screw groove on the inside.

[0020] The body 31 is a film-like laminate formed into a cylindrical shape. One end of the body 31 extending cylindrically is joined to a shoulder 35. Meanwhile, the other end of the body 31 is sealed by a bottom seal 39 formed by overlapping and joining the inner surfaces of the cylindrical body 31 (see FIG. 2). The bottom seal 39 may be joined after the body 31 is filled with the contents. The tube container 30, particularly the body 31, may be configured to have flexibility (softness, squeezability) that allows a desired amount of contents to be easily pushed out even if the contents have some viscosity. The dimensions of the body 31 may be appropriately designed depending on the type of contents, and may be, for example, 50 mm in diameter.

[0021] The tube container 30 having the above-mentioned structure is obtained through the following manufacturing process. First, as shown in Fig. 3, a pair of bonding ends (hereinafter sometimes referred to as both ends) 33A, 33B of the laminate 10 are overlapped using the laminate 10, and the outer and inner surfaces of the overlapped parts are heat-sealed and bonded together to form a body bonding part 32 (also called a side seam part), thereby manufacturing a cylindrical body part 31. Heat sealing can be performed by a conventionally known method such as bar sealing, rotary roll sealing, belt sealing, impulse sealing, high frequency sealing, ultrasonic sealing, and flame sealing.

[0022] 1, the cylindrical body 31 is placed in a mold (not shown), and a head molded body 37 (shoulder part 35, mouth part 36) is formed at one opening (upper side) 34A of the body 31 by a method such as compression molding or injection molding. In this way, the head molded body 37 (shoulder part 35, mouth part 36) is molded integrally with one opening (upper side) 34A of the body 31, and the tube container 30 is produced. Then, the cap 20 is attached to the mouth part 36 side of the tube container 30.

[0023] Next, an appropriate amount of contents, such as hand cream, sunscreen, toothpaste, or the like, is filled into the tube container 30 from the other opening (lower side) 34B of the cylindrical body 31 shown in Fig. 1. The opening (lower side) 34B is then welded to form a bottom seal 39. As a result, a packaged product 30A including the tube container 30 filled and packaged with the contents is obtained, as shown in Fig. 2.

[0024] The details of the head molded body 37 will be further described. The head molded body 37 is made of a material that can be molded so that the mouth portion 36 and the shoulder portion 35 have appropriate hardness, has high adhesion to the material of the body portion 31, does not affect the quality of the contents, and does not cause hygienic problems even if it comes into contact with the contents. As such a material, a thermoplastic resin is used for the head molded body 37, and more specifically, high density polyethylene (HDPE) is used.

[0025] Furthermore, the head molding 37 may be made of polyolefin resins such as low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, polypropylene (homopolypropylene, block polypropylene, random polypropylene), copolymers of olefins with copolymerizable monomers such as vinyl monomers, acrylic monomers, unsaturated carboxylic acids, or blends thereof, or resins in which the above-mentioned resins are blended with high-density polyethylene. Furthermore, from the viewpoint of heat resistance and thermal adhesion to the body 31, it is preferable to use a resin in which high-density polyethylene is blended with linear low-density polyethylene for the head molding 37. Furthermore, a truncated cone-shaped cylinder may be laminated as a barrier material to prevent the permeation of gases such as oxygen, particularly on the shoulder 35 of the head molding 37. The shoulder 35 may contain a plant-derived resin.

[0026] The high density polyethylene used to form the shoulder 35 of the head molded body 37 may be derived from fossil raw materials, but biomass-derived high density polyethylene, known as a carbon neutral material, may be used to reduce the environmental impact. Since the head and cap account for a large mass ratio of the tube container, by molding the head molded body 37 using biomass-derived high density polyethylene, the amount of fossil raw materials used for the entire tube container can be reduced, thereby reducing the environmental impact. In addition, the head molded body 37 of the tube container 30 is comparable in terms of physical properties such as mechanical properties to heads manufactured from conventional raw materials obtained from fossil raw materials, so it can replace conventional heads.

[0027] From the viewpoint of reducing the environmental load, it is preferable to use only biomass-derived polyethylene, but a blend of fossil-derived polyethylene and biomass-derived polyethylene may be used in consideration of production costs, etc. Here, biomass-derived polyethylene is a monomer polymer containing biomass-derived ethylene. Since biomass-derived ethylene is used as the raw material monomer, the polymerized polyethylene is derived from biomass. The content of biomass-derived ethylene in the raw material monomer does not need to be 100% by mass, and is, for example, preferably 10% by mass or more, more preferably 30% by mass or more.

[0028] The raw material monomer may contain ethylene derived from fossil raw materials, or may contain α-olefin monomers such as butylene, hexene, and octene. Even in such a case, the obtained polymer is called biomass polyethylene. When using biomass-derived polyethylene, it may contain two or more polyolefins with different biomass degrees. When blending fossil-derived polyethylene and biomass-derived polyethylene, the mixing method is not particularly limited, and dry blending or melt blending may be used. When mixing the two, the mixing ratio of fossil-derived polyethylene and biomass-derived polyethylene is preferably 1:9 to 9:1 in mass ratio, more preferably 2:8 to 8:2.

[0029] For example, biomass-derived ethylene can be produced using biomass-derived ethanol as a raw material. In particular, it is preferable to use biomass-derived fermented ethanol obtained from a plant raw material. In other words, it is preferable to use a plant-derived resin. The plant raw material is not particularly limited, and any conventionally known plant can be used. Examples include corn, sugarcane, beet, and manioc.

[0030] In the present invention, the fermented ethanol derived from biomass refers to ethanol produced by contacting a culture solution containing a carbon source obtained from a plant raw material with an ethanol-producing microorganism or a product derived from its crushed material, and then purifying the ethanol. Conventionally known methods such as distillation, membrane separation, and extraction can be applied to purify ethanol from the culture solution. For example, a method of adding benzene, cyclohexane, etc., and removing water by azeotropy or membrane separation can be used.

[0031] The thickness of the head molded body 37 using such resins is preferably 0.5 mm or more and 2.0 mm or less. In this embodiment, the head molded body 37 is produced by compression molding. Therefore, in the head molded body 37, which is a compression molded product, it is possible to prevent the occurrence of depressions, so-called sink marks, caused by shrinkage during molding, even in thick parts such as the top surface. Furthermore, it is possible to reduce waste of material such as in the gate portion. The head molded body 37 may also be produced by injection molding.

[0032] Next, the laminate 10 forming the cylindrical body 31 will be described with reference to FIG. 4. The laminate 10 forming the body 31 of the tube container 30 is a laminate having a first sealant layer 12, a paper base layer 13, an adhesive layer 16, a barrier layer 14, and a second sealant layer 15, which are arranged in this order from the outer surface to the inner surface, as shown in FIG. 4. The first sealant layer 12, the paper base layer 13, the adhesive layer 16, the barrier layer 14, and the second sealant layer 15 have different thicknesses in reality, but are shown as the same thickness in FIG. 4 for convenience. In addition, the adhesive layer formed during adhesion by dry lamination is thinner than the other layers, and is therefore not shown. When forming the cylindrical body 31, the first sealant layer 12 and the second sealant layer 15 are directly bonded to one end of the laminate 10.

[0033] An outer surface printed portion 13A including a desired pattern is formed using printing ink on the outer surface of the paper base layer 13. Also, an outer surface printed portion including a desired pattern may be formed using printing ink on the outer surface of the first sealant layer.

[0034] The first sealant layer 12 and the paper base layer 13 are joined by extrusion lamination. The paper base layer 13 and the barrier layer 14 are joined by an adhesive layer 16 formed by extrusion lamination. The barrier layer 14 and the second sealant layer 15 are joined by extrusion lamination (adhesive layer 16: not shown) or dry lamination. When the barrier layer 14 and the second sealant layer 15 are laminated by extrusion lamination, the barrier layer 14 and the second sealant layer 15 can be made compatible with the extruded resin to maintain content resistance.

[0035] The ratio of the thickness of the first sealant layer 12 to the thickness of the paper base layer 13 is preferably 0.65 or more (65% or more). If the ratio of the thickness of the first sealant layer 12 to the thickness of the paper base layer 13 is less than 0.65, the possibility that the paper will be exposed until the tube container 30 is used up when the vicinity of the body attachment portion 32 (side seam portion) is folded is reduced. In addition, the ratio of the thickness of the first sealant layer 12 to the thickness of the paper base layer 13 is preferably 2.0 or less (200% or less). This is because even if the ratio of the thickness of the first sealant layer 12 to the thickness of the paper base layer 13 exceeds 2.0, there is no significant change in terms of preventing exposure of the paper base material, and resources will be wasted.

[0036] In addition, the ratio of the thickness of the second sealant layer 15 to the thickness of the paper base layer 13 is preferably 0.65 or more (65% or more). If the ratio of the thickness of the second sealant layer 15 to the thickness of the paper base layer 13 is less than 0.65, the possibility that the paper will be exposed until the tube container 30 is used up when the vicinity of the body attachment portion 32 is folded is reduced. In addition, the ratio of the thickness of the second sealant layer 15 to the thickness of the paper base layer 13 is preferably 2.0 or less (200% or less). This is because even if the ratio of the thickness of the first sealant layer 12 to the thickness of the paper base layer 13 exceeds 2.0, there is no significant change in terms of preventing exposure of the paper base material, and resources will be wasted.

[0037] When two layers are bonded by dry lamination, an adhesive layer can be formed by applying an adhesive to the surface of the layer to be laminated and drying it. As the adhesive, for example, one-component or two-component curing or non-curing type vinyl, (meth)acrylic, polyamide, polyester, polyether, polyurethane, epoxy, rubber, and other solvent-based, water-based, or emulsion-based adhesives can be used. As a two-component curing type adhesive, a cured product of polyol and an isocyanate compound can be used. As a coating method of the above-mentioned adhesive for lamination, for example, it can be applied to the coating surface of the layer constituting the laminate by a direct gravure roll coating method, a gravure roll coating method, a kiss coating method, a reverse roll coating method, a Fountain method, a transfer roll coating method, or other methods.

[0038] Thermoplastic resins used for extrusion lamination include polyethylene resins, polypropylene resins, cyclic polyolefin resins, copolymer resins, modified resins, or mixtures (including alloys) that mainly contain these resins. Examples of polyolefin resins include the above-mentioned polyethylene, polypropylene (PP), ethylene-α-olefin copolymers polymerized using a metallocene catalyst, random or block copolymers of ethylene and polypropylene, ethylene-vinyl acetate copolymers (EVA), ethylene-acrylic acid copolymers (EAA), ethylene-ethyl acrylate copolymers (EEA), ethylene-methacrylic acid copolymers (EMAA), ethylene-methyl methacrylate copolymers (EMMA), ethylene-maleic acid copolymers, ionomer resins, and acid-modified polyolefin resins obtained by modifying the above-mentioned polyolefin resins with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid to improve adhesion between layers. In addition, resins obtained by graft-polymerizing or copolymerizing unsaturated carboxylic acids, unsaturated carboxylic anhydrides, and ester monomers can be used as polyolefin resins. These materials can be used alone or in combination of two or more. As cyclic polyolefin-based resins, for example, cyclic polyolefins such as ethylene-propylene copolymers, polymethylpentene, polybutene, and polynorbornene can be used. These resins can be used alone or in combination of two or more. In addition, as the above-mentioned polyethylene-based resins, those using the above-mentioned biomass-derived ethylene as a monomer unit can be used to further improve the biomass degree.

[0039] When the adhesive layer 16, which is an adhesive resin layer, is laminated by extrusion lamination, an anchor coat (AC) layer may be provided on the surface of the layer to be laminated by applying and drying an anchor coat agent. The anchor coat agent may be any resin having a heat resistance of 135°C or higher, such as a vinyl modified resin, an epoxy resin, a urethane resin, a polyester resin, or a polyethyleneimine. In particular, an anchor coat agent which is a cured product of a polyacrylic or polymethacrylic resin (polyol) having two or more hydroxyl groups in the structure and an isocyanate compound as a curing agent is preferably used. In addition, a silane coupling agent may be used in combination with this as an additive, and nitrocellulose may be used in combination to increase heat resistance.

[0040] The anchor coat layer after drying has a thickness of 0.1 μm to 1 μm, preferably 0.3 μm to 0.5 μm. The adhesive layer after drying has a thickness of preferably 1 μm to 10 μm, preferably 2 μm to 5 μm. The adhesive resin layer has a thickness of preferably 5 μm to 50 μm, preferably 10 μm to 30 μm.

[0041] Next, the materials of each part constituting the laminate 10 of the cylindrical body portion 31 will be described. The first sealant layer 12 and the second sealant layer 15 may include, for example, polyethylene (PE). Specifically, the first sealant layer 12 and the second sealant layer 15 may be made of the following materials:

[0042] The first sealant layer 12 and the second sealant layer 15 may be made of any material that can be melted and fused to each other by heat, and may be made of one or more of the following resins: low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), polypropylene (PP), ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, acid-modified polyolefin resins such as polyethylene or polypropylene modified with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, and the like; polyvinyl acetate resins; polyester resins; polystyrene resins; and the like.

[0043] Moreover, unbleached kraft paper, bleached kraft paper, cup base paper, or parchment paper can be used as the paper base layer 13, and by printing on the paper base layer 13, an outer surface printed portion 13A made of printing ink can be provided on the paper base layer 13. Moreover, the paper base layer 13 is responsible for maintaining the rigidity of the tube container.

[0044] As the barrier layer 14, an appropriate one is selected according to the required functions, such as the barrier property against water vapor and other gases, and an ethylene-vinyl alcohol copolymer film, a vapor deposition film, or a metal foil can be used. When a metal foil is used as the barrier layer 14, various metal foils having barrier properties, such as copper and tin, can be used, but it is preferable to use an aluminum foil.

[0045] When a vapor-deposited film is used as the barrier layer 14, the base film of the vapor-deposited film may be polyethylene terephthalate (PET), nylon, or the like. As the metal to be vapor-deposited on the base film, various materials generally used for metal vapor deposition, such as copper and tin, may be used. Also, a vapor-deposited film of a metal oxide such as aluminum oxide or an inorganic oxide such as silicon oxide may be provided.

[0046] When a vapor-deposited film is used as the barrier layer 14, a PET layer having a metal vapor-deposited film on at least one side and gas barrier properties may be used, or a nylon layer having a metal vapor-deposited film on at least one side and gas barrier properties may be used.

[0047] Also, a PET layer having a vapor-deposited silica film on at least one surface thereof and thus having gas barrier properties may be used, or a nylon layer having a vapor-deposited silica film on at least one surface thereof and thus having gas barrier properties may be used.

[0048] Also, a PET layer having an aluminum oxide vapor deposition film on at least one surface thereof and thus having gas barrier properties may be used, or a nylon layer having an aluminum oxide vapor deposition film on at least one surface thereof and thus having gas barrier properties may be used.

[0049] When a nylon layer is used, the mechanical strength is often superior to that of a PET layer. In addition, a film provided with various deposition films has superior gas barrier properties to a film serving as a base material. Furthermore, a gas barrier coating film may be provided on the deposition film. This suppresses the permeation of oxygen and water vapor, and by providing the coating film adjacent to the deposition film, the occurrence of cracks in the deposition film can be effectively prevented. The gas barrier coating film is a gas barrier coating film containing at least one resin composition such as a hydrolyzate of a metal alkoxide or a hydrolyzed condensate of a metal alkoxide obtained by polycondensing a mixture of a metal alkoxide and a water-soluble polymer by a sol-gel method in the presence of a sol-gel catalyst, water, an organic solvent, and the like.

[0050] The resins described above as materials used for the first sealant layer 12 and the second sealant layer 15 may be not only those derived from fossil raw materials, but also biomass-derived resins. For example, in addition to the biomass-derived polyethylene resin described above, biomass polyesters using biomass-derived ethylene glycol as a diol component as described in JP 2012-116082 A, polylactic acid resins, cellophane, starch, cellulose, etc. are usable. As the biomass-derived resin, it is preferable to use a plant-derived resin.

[0051] The outer surface printed portion 13A provided on the outer surface of the paper base layer 13 is printed by gravure printing or offset printing on the paper base layer 13, so it is possible to print with excellent decorativeness. In addition, in the case of a paper base layer that is inferior in smoothness, the smoothness can be improved by covering the surface of the paper base layer with polyethylene. It is possible to impart design properties by performing flexographic printing or digital printing on top of it.

[0052] Next, a method for manufacturing the laminate 10 of the cylindrical body portion 31 will be described with reference to FIG. First, printing is applied to the outer surface of the paper base layer 13 to provide an outer surface printed portion 13A made of printing ink on the outer surface of the paper base layer 13.

[0053] Next, the first sealant layer 12 is laminated on the outer surface of the paper base layer 13 by extrusion lamination.

[0054] Next, the barrier layer 14 is laminated by extrusion lamination onto the inner surface of the paper base layer 13. In this way, a laminate in which the paper base layer 13 and the barrier layer 14 are laminated is prepared.

[0055] Next, the second sealant layer 15 is bonded by extrusion lamination or dry lamination to the inner surface of the laminate of the paper base layer 13 and the barrier layer 14 prepared above. The bonding surface of this laminate is the barrier layer 14 side.

[0056] In the manner described above, the laminate 10 of the body portion 31 is obtained. However, as long as the desired laminate 10 can be obtained, the manufacturing method is not limited to the above method.

[0057] The laminate 10 of the body 31 thus obtained is wound into a cylindrical shape, and as described above, both ends 33A, 33B are overlapped, and the outer and inner surfaces of the laminate 10 are heat-sealed at both ends 33A, 33B to form the body bonding portion 32, thereby producing the tubular body 31. In this case, the first sealant layer 12 provided on the outer surface side of the laminate 10 and the second sealant layer 15 provided on the inner surface side are melted and joined, and the tubular body 31 is obtained.

[0058] The inner end 33B may be protected by, for example, taping or by folding the end 33B toward the outside of the container (hemming).

[0059] Next, the opening (upper side) 34A of the cylindrical body 31 shown in FIG. 3 is inserted into a mold (not shown), and a shoulder 35 and a mouth 36 are formed at the opening (upper side) 34A of the cylindrical body 31 using a method such as compression molding or injection molding, thereby obtaining the tube container 30 (see FIG. 1).

[0060] Next, the cap 20 is attached to the mouth 36 of the tube container 30 manufactured as described above, and a plurality of the tube containers 30 with the cap 20 attached are stored together in a cardboard box. After that, the plurality of tube containers 30 with the cap 20 attached are transported together in a cardboard box. After that, at the transport destination, the tube containers 30 are filled with an appropriate amount of hand cream, sunscreen, toothpaste, and other contents, and the opening (lower side) 34B is welded to form a bottom seal portion 39. This results in a packaged product 30A in which the contents are filled and packaged in the tube container 30.

[0061] <Example 1> The central substrate of the first sealant layer 12 was an LLDPE film having a thickness of 70 μm, and the paper substrate layer 13 was a paper having a thickness of 120 μm ("Nagoya Sarashi Ryuo" manufactured by Daio Paper Co., Ltd. (basis weight 100 g / m2 )"), a 20 μm thick ethylene-methacrylic acid copolymer resin layer (EMAA) was used as the adhesive layer 16, a 12 μm thick transparent vapor-deposited PET film was used as the barrier layer 14, and a 60 μm thick LLDPE film was used as the central substrate of the second sealant layer 15.

[0062] Specifically, first, an outer surface printed portion 13A was formed on the outer surface side of a 120 μm-thick paper that would become the paper base layer 13. Next, the first sealant layer 12 was laminated by extrusion lamination on the outer surface of the 120 μm-thick paper that would become the paper base layer 13. Specifically, on the outer surface of the paper base layer 13, a 70 μm-thick LLDPE film that would become the central base material of the first sealant layer 12 was bonded by extrusion lamination using PE, a thermoplastic resin, as an adhesive layer with a thickness of 20 μm.

[0063] Furthermore, a 20 μm thick PE was laminated by extrusion lamination on the outer surface of the 70 μm thick LLDPE film that was the central substrate of the first sealant layer 12. The 20 μm thick PE that formed the outermost surface of the laminate and the 20 μm thick PE on the inner surface of the 70 μm thick LLDPE film constitute the first sealant layer 12 together with the 70 μm thick LLDPE film.

[0064] Next, a 12 μm thick transparent vapor-deposited PET film to become the barrier layer 14 was attached to the inner surface of the paper base layer 13 by extrusion lamination, with a 20 μm thick adhesive layer 16 made of EMAA, a thermoplastic resin. Next, an anchor coat layer was formed on the inner surface of a 12 μm-thick transparent vapor-deposited PET film that would become the barrier layer 14, and a 60 μm-thick LLDPE film that would become the central substrate of the second sealant layer 15 was bonded to the film by extrusion lamination using a 20 μm-thick adhesive layer made of polyethylene (PE), a thermoplastic resin.

[0065] As a result, a laminate 10 was obtained having a structure of PE 20 μm / LLDPE film 70 μm / PE 20 μm / printing layer (ink) / paper 120 μm / EMAA 20 μm / transparent vapor-deposited PET film 12 μm / PE 20 μm / LLDPE film 60 μm. The thickness of the first sealant layer 12 is 110 μm, and the thickness of the paper base layer 13 is 120 μm (basis weight 100 g / m 2 ). The thickness ratio of the first sealant layer 12 to the paper base layer 13 was 0.92 (92%), which was 0.65 or more (65% or more). The thickness of the second sealant layer 15 was 80 μm, consisting of the 60 μm LLDPE film and the 20 μm PE on its inner surface. Therefore, the thickness ratio of the second sealant layer 15 to the paper base layer 13 was 0.67 (67%), which was 0.65 or more (65% or more).

[0066] <Example 2> The central substrate of the first sealant layer 12 was an LLDPE film having a thickness of 50 μm, and the paper substrate layer 13 was paper having a thickness of 105 μm ("Snow Queen" manufactured by Daio Paper Co., Ltd. (basis weight 80 g / m 2 )"), a 20 μm thick ethylene-methacrylic acid copolymer resin layer (EMAA) was used as the adhesive layer 16, a 10 μm thick aluminum foil (JIS 1N30) was used as the barrier layer 14, and a 80 μm thick LLDPE film was used as the central substrate of the second sealant layer 15.

[0067] Specifically, first, the outer surface printed part 13A was formed on the outer surface side of the 105 μm thick paper that becomes the paper base layer 13. Next, the first sealant layer 12 was laminated by extrusion lamination on the outer surface of the 105 μm thick paper that becomes the paper base layer 13. Specifically, on the outer surface of the paper base layer 13, a 50 μm thick LLDPE film that becomes the central base material of the first sealant layer 12 was bonded by extrusion lamination with PE, which is a thermoplastic resin, as an adhesive layer with a thickness of 15 μm. Furthermore, PE with a thickness of 15 μm was laminated by extrusion lamination on the outer surface of the 50 μm thick LLDPE film that becomes the central base material of the first sealant layer 12. The 15 μm thick PE that becomes the outermost surface of the laminate and the 15 μm thick PE on the inner side constitute the first sealant layer 12.

[0068] Next, a 10 μm thick aluminum foil that would become the barrier layer 14 was bonded to the inner surface of the paper base layer 13 by extrusion lamination, with a 20 μm thick adhesive layer 16 made of EMAA, a thermoplastic resin. Next, an anchor coat layer was formed on the inner surface of the 10 μm thick aluminum foil that would become the barrier layer 14, and an 80 μm thick LLDPE film that would become the central base material of the second sealant layer 15 was bonded to the inner surface of the 10 μm thick aluminum foil that would become the barrier layer 14 by extrusion lamination, with a 20 μm thick adhesive layer made of EMAA, a thermoplastic resin.

[0069] As a result, a laminate 10 was obtained having a structure of PE 15 μm / LLDPE film 50 μm / PE 15 μm / printing layer (ink) / paper 105 μm / EMAA 20 μm / aluminum foil 10 μm / EMAA 20 μm / LLDPE film 80 μm. The thickness of the first sealant layer 12 was 80 μm, and the thickness of the paper base layer 13 was 105 μm (basis weight 80 g / m 2 ). The thickness ratio of the first sealant layer 12 to the paper base layer 13 was 0.76 (76%), which was 0.65 or more (65% or more). The thickness of the second sealant layer 15 was 100 μm, consisting of the 80 μm LLDPE film and the 20 μm EMAA on its inner surface. Therefore, the thickness ratio of the second sealant layer 15 to the paper base layer 13 was 0.95 (95%), which was 0.65 or more (65% or more).

[0070] <Example 3> The central substrate of the first sealant layer 12 was an LLDPE film having a thickness of 50 μm, and the paper substrate layer 13 was paper having a thickness of 105 μm ("Snow Queen" manufactured by Daio Paper Co., Ltd. (basis weight 80 g / m 2 )"), a 20 μm thick ethylene-methacrylic acid copolymer resin layer (EMAA) was used as the adhesive layer 16, a 12 μm thick transparent vapor-deposited PET film was used as the barrier layer 14, and a 60 μm thick LLDPE film was used as the central substrate of the second sealant layer 15.

[0071] Specifically, first, a 12 μm-thick transparent vapor-deposited PET film that would become the barrier layer 14 was bonded to the inner surface of a 105 μm-thick paper that would become the paper base layer 13 by extrusion lamination, using a 20 μm-thick adhesive layer 16 made of EMAA, a thermoplastic resin. Next, an anchor coat layer was formed on the inner surface of a 12 μm-thick transparent vapor-deposited PET film that would become the barrier layer 14, and a 60 μm-thick LLDPE film that would become the central substrate of the second sealant layer 15 was bonded to it by extrusion lamination, using a 20 μm-thick adhesive layer made of PE, a thermoplastic resin.

[0072] Next, the first sealant layer 12 was laminated on the outer surface of the paper base layer 13 by extrusion lamination. Specifically, a 50 μm thick LLDPE film, which is the central substrate of the first sealant layer 12, was bonded to the outer surface of the paper base layer 13 by extrusion lamination using PE, which is a thermoplastic resin, as an adhesive layer with a thickness of 15 μm. Furthermore, a 15 μm thick PE was laminated on the outer surface of the 50 μm thick LLDPE film, which is the central substrate of the first sealant layer 12, by extrusion lamination. The 15 μm thick PE, which is the outermost surface of the laminate, and the 15 μm thick PE on the inner surface side constitute the first sealant layer 12. Furthermore, a printed portion was formed by flexographic printing on the outer surface side of the 15 μm thick PE layer, which constitutes the first sealant layer 12.

[0073] As a result, a laminate 10 having a configuration of printed layer (ink) / PE 15 μm / LLDPE film 50 μm / PE 15 μm / paper 105 μm / EMAA 20 μm / transparent vapor-deposited PET film 12 μm / PE 20 μm / LLDPE film 60 μm was obtained. The thickness of the first sealant layer 12 was 80 μm, and the thickness of the paper base layer 13 was 105 μm. The ratio of the thickness of the first sealant layer 12 to the paper base layer 13 was 0.76 (76%), which was 0.65 or more (65% or more). The thickness of the second sealant layer 15 was 80 μm, which was the sum of the LLDPE film 60 μm and the PE 20 μm on its inner surface. Therefore, the ratio of the thickness of the second sealant layer 15 to the paper base layer 13 was 0.76 (76%), which was 0.65 or more (65% or more).

[0074] <Comparative Example> The first sealant layer was a PE resin with a thickness of 60 μm, and the paper base layer was a paper with a thickness of 120 μm (Daioh Paper Co., Ltd.'s Nagoya Sarashi Ryuo (basis weight 100 g / m 2 )"), a 12 μm-thick transparent vapor-deposited PET film was used as the barrier layer, and a 60 μm-thick PE film was used as the central substrate of the second sealant layer.

[0075] As a result, a laminate having a structure of PE 60 μm / printing layer (ink) / paper 120 μm / EMAA 20 μm / transparent vapor-deposited PET 12 μm / PE 20 μm / PE film 60 μm was obtained. The thickness of the first sealant layer was 60 μm, and the thickness of the paper base layer was 120 μm. The thickness ratio of the first sealant layer to the paper base layer was 0.50 (50%), which was less than 0.65 (less than 65%). The thickness of the second sealant layer 15 was 80 μm, which was the sum of the PE film 60 μm and the PE 20 μm on its inner surface. Therefore, the thickness ratio of the second sealant layer 15 to the paper base layer 13 was 0.67 (67%), which was 0.65 or more (65% or more).

[0076] <Evaluation> A total of four body parts, Examples 1 to 3 and Comparative Example, were evaluated, and a test was performed on the interlayer strength of the paper base material. A laminate including the body attachment part 32 of the body part 31 as shown in FIG. 3 was cut into a 60 mm square, and the vicinity of the body attachment part 32 was folded in a mountain shape when viewed from the outer surface side, and a weight of 1 kg was placed on it. After leaving it still for 24 hours, the cross section was photographed with a microscope to obtain an image, and the photographed image was visually checked to confirm whether the paper base layer was exposed on the outer surface side (first sealant layer 12 side). In the same manner, a laminate including the body attachment part 32 of the body part 31 was cut into a 60 mm square, and the vicinity of the body attachment part 32 was folded in a valley shape when viewed from the outer surface side, and a weight of 1 kg was placed on it. After leaving it still for 24 hours, the cross section was photographed with a microscope to obtain an image, and the photographed image was visually checked to confirm whether the paper base layer was exposed on the inner surface side (second sealant layer 15 side). FIG. 5 is a diagram showing a cross-sectional image of the laminate taken with a microscope. Fig. 5(a) shows the state before folding, and Fig. 5(b) shows the state after folding in a valley shape as viewed from the outer surface side near the body attachment portion 32. Fig. 5 is an image of a comparative example, in which the paper is exposed.

[0077] 6 is a diagram showing a test of interlaminar strength of a paper base layer. Cellophane tape 50 was applied to the front and back of the paper used as the paper base layer in Examples 1 to 3 and the Comparative Example to prepare a test piece S having a width of 15 mm.

[0078] Then, as shown in FIG. 6, a tensile testing machine was used to pull both sides of the test piece S with a pair of chucks 40, 40. At this time, one of the chucks 40 (the lower side in FIG. 6) was fixed. The peak strength at 20 mm peeling was measured and taken as the "interlaminar strength." The tensile testing machine used was a "Tensilon Universal Testing Machine RTF" manufactured by Orientec Co., Ltd. The tensile testing speed was 50 mm / min. The test results are shown in Table 1.

[0079] [Table 1]

[0080] The interlaminar strength of the paper was measured three times with the longitudinal direction of the test piece S being the width direction of the tube container 30 of the laminate 10, and the average value was recorded.

[0081] The evaluation results shown in Table 1 reveal that a laminate used for the body of a tube container, which is composed of a first sealant layer 12, a paper base layer 13, and a second sealant layer 15 laminated in that order, and in which the thickness of the first sealant layer is 65% or more of the thickness of the paper base layer, is less likely to have paper exposure on the outer side (the first sealant layer 12 side).

[0082] In addition, the evaluation results shown in Table 1 reveal that a laminate in which the thickness of the second sealant layer 15 is 65% or more of the thickness of the paper base layer 13 is less likely to have paper exposure on the inner side (the second sealant layer 15 side).

[0083] Furthermore, the evaluation results shown in Table 1 reveal that in laminates in which the interlayer strength of the paper base layer 13 is 0.7 N / 15 mm or more, such as in Examples 1 to 3, the paper is less likely to be exposed when the ratio of the thickness of the first sealant layer 12 to the thickness of the paper base layer 13 is 0.65 or more.

[0084] Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications are possible. For example, in the above embodiment, the laminate has a barrier layer between the paper base layer and the second sealant layer, but it is not necessarily required to provide a barrier layer and can be provided as appropriate depending on the characteristics of the contents.

[0085] In addition, in the above embodiment, a screw-type cap was used, which has a thread on the outer peripheral surface of the mouth and a thread groove on the inner surface to screw into the thread. However, other types of caps may be used, such as a type that is connected by a so-called one-touch fitting, in which the cap can be attached and detached from the container by only vertical linear movement. [Explanation of symbols]

[0086] 10.... (of body 31 of tube container 30) laminate 12...First sealant layer 13...Paper base layer 14. Barrier layer 15...Second sealant layer 16...adhesive layer 20 Cap 30...Tube container 31... Body 32... Body attachment section 33A: The outer edge of the joint when the body is pasted 33B: The end of the joint that will be the inside when the body is pasted 34A...Opening (upper side) 34B...Opening (lower side) 35...Shoulder 36...Mouth 37... Head molding 39 Bottom seal 40···Chuck 50 Cellophane tape

Claims

1. A laminate for use in the body of a tube container, comprising at least a first sealant layer, a paper substrate layer, and a second sealant layer laminated in this order, with or without other layers sandwiched therebetween, the ratio of the thickness of the first sealant layer to the thickness of the paper base layer is 0.65 or more and 2.0 or less; the ratio of the thickness of the second sealant layer to the thickness of the paper base layer is 0.65 or more and 2.0 or less; A laminate characterized in that the paper thickness of the paper substrate layer is 105 mm or more and 120 mm or less.

2. A laminate for use in the body of a tube container, comprising at least a first sealant layer, a paper substrate layer, and a second sealant layer laminated in this order, with or without other layers sandwiched therebetween, the ratio of the thickness of the first sealant layer to the thickness of the paper base layer is 0.65 or more and 2.0 or less; the ratio of the thickness of the second sealant layer to the thickness of the paper base layer is 0.65 or more and 2.0 or less; A laminate characterized in that the paper base layer has a basis weight of 80 g / m 2 or more and 100 g / m 2 or less.

3. A tube container, comprising the laminate according to claim 1 or 2 as a body portion.

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