Tube container

Abstract

To provide a laminate for a tube container capable of suppressing exposure of a paper base material, while reducing a used amount of plastic; and to provide a tube container using such a laminate.SOLUTION: A laminate 10 is used for a trunk 31 of a tube container 30 by laminating at least a first sealant layer 12, a paper base material layer 13 and a second sealant layer 15 in due order, and by butting the end faces of the ends 33A, 33B. In the laminate 10, the ratio of a thickness of the first sealant layer 12 to a thickness of the paper base material layer 13 is 0.03 or more and 0.30 or less.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a laminate for a tube container and a tube container, and in particular to a laminate including a paper base layer and a tube container. [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 plastic (synthetic resin) used in consideration of the environment. In order to reduce the amount of plastic used, a paper base material is also used in the laminated body of tube containers. However, in tube containers, it is possible that not all of the contents can be dispensed, and some of the contents 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, the paper base material may become exposed from the laminated body near the folded portion. This causes problems such as the aesthetic appearance being impaired by the exposed paper base material, and water entering from the exposed part of the paper base material causing delamination between the layers.

[0005] Therefore, an object of the present disclosure is to provide a laminate for tube containers that can easily prevent exposure of the paper base material while reducing the amount of plastic used, and a tube container using such a laminate. [Means for solving the problem]

[0006] In order to solve the above problems, the present disclosure provides: A laminate in which at least a first sealant layer, a paper base layer, and a second sealant layer are laminated in this order and are used for a body part of a tube container by butting end faces of the laminate together, The laminate has a ratio of the thickness of the first sealant layer to the thickness of the paper base layer of 0.03 or more and 0.30 or less.

[0007] In addition, the laminate of the present disclosure is A barrier layer may be provided between the paper base layer and the second sealant layer.

[0008] The present disclosure also provides The tube container is provided with a body portion formed by butting both ends of the laminate together and covering the both ends with a joining tape.

[0009] In addition, the tube container of the present disclosure is The bonding tape may be provided on both the inner and outer surfaces of the laminate.

[0010] In addition, the tube container of the present disclosure is The laminate may have a side seam strength of 80N / 15mm or more.

[0011] In addition, the tube container of the present disclosure is The peel strength between the body and the shoulder joined to the body may be 40N / 15mm or more. Effect of the Invention

[0012] According to the present disclosure, it is possible to provide a laminate for a tube container that can easily reduce the amount of plastic used while minimizing exposure of a paper base material, and a tube container using such a laminate. [Brief description of the drawings]

[0013] [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 an embodiment of the present disclosure. [Figure 4] 1 is a partial cross-sectional view of a portion where both ends 33A, 33B of cylindrical body 31 are butted together, as viewed from the axial direction of cylindrical body 31. FIG. [Diagram 5] FIG. 2 is a cross-sectional view of a laminate of a body portion of a tube container according to one embodiment of the present disclosure. [Figure 6] FIG. 2 is a cross-sectional view of a joining tape used in a tube container according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the drawings. However, the present disclosure 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, unnecessary parts for explanation and repeated reference symbols may be omitted.

[0015] 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).

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] The tube container 30 having the above-mentioned configuration is obtained through the following manufacturing process. First, as shown in FIG. 3, a pair of ends (hereinafter, sometimes referred to as both ends) 33A, 33B of the laminate 10 are butted together using the laminate 10. Then, the outer surface and the inner surface of the butted portion are heat sealed to join the joining tape 60, and the body attachment portion 32 (also called a side seam portion) is formed. In this manner, a cylindrical body portion 31 is manufactured. The portion joined by the joining tape 60 becomes the body attachment portion 32 of the body portion 31. The heat sealing method can be a conventionally known method such as bar sealing, rotary roll sealing, belt sealing, impulse sealing, high frequency sealing, ultrasonic sealing, and flame sealing.

[0021] 4 is a view of the portion where both ends 33A and 33B in FIG. 3 are butted together, as viewed from the axial direction of the cylindrical body 31. FIG. 4(a) shows a case where both ends 33A and 33B of the laminate 10 are formed perpendicular to the surface of the laminate 10, and FIG. 4(b) shows a case where both ends 33A and 33B of the laminate 10 are formed obliquely to the surface of the laminate 10. In FIG. 4, for convenience of explanation, the laminate 10 constituting the body 31 is shown as a three-layer structure of a first sealant layer 12, a paper base layer 13, and a second sealant layer 15. As shown in FIG. 4(a) and (b), the joining mode differs depending on the mode of both ends 33A and 33B, but in either case, a joining tape 60 is arranged so as to cover the portion where both ends 33A and 33B of the laminate 10 are in contact, and the both ends 33A and 33B are joined by heat sealing.

[0022] 4(a) and 4(b) show an example in which the joining tape 60 is provided on both the inner and outer surfaces of the cylindrical body 31, but as shown in FIG. 4(c) and 4(d), the joining tape 60 may be provided only on the inner surface of the cylindrical body 31. FIG. 4(c) shows a case in which both ends 33A and 33B of the laminate 10 are formed perpendicular to the surface of the laminate 10, as in FIG. 4(a), and FIG. 4(d) shows a case in which both ends 33A and 33B of the laminate 10 are formed obliquely to the surface of the laminate 10, as in FIG. 4(b). Naturally, stronger joining is possible when both the inner and outer surfaces of the cylindrical body 31 are joined, but joining with practical strength is also possible only on the inner surface side of the cylindrical body 31.

[0023] Next, the cylindrical body 31 shown in Fig. 3 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 integrally molded at one opening (upper side) 34A of the body 31, and the tube container 30 is produced. Then, as shown in Fig. 1, the cap 20 is attached to the mouth part 36 side of the tube container 30.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] In the present disclosure, 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, methods include adding benzene, cyclohexane, etc., and removing water by azeotropy or membrane separation, etc.

[0032] 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.

[0033] Next, the laminate 10 forming the cylindrical body 31 will be described with reference to FIG. 5. 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. 5. 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 in FIG. 5, they are shown as having the same thickness for convenience. As will be described later, in reality, the ratio of the thickness of the first sealant layer 12 to the thickness of the paper base layer 13 is 0.03 or more and 0.30 or less. In addition, each layer can be bonded by dry lamination using an adhesive, but the adhesive layer formed during bonding by dry lamination is thinner than the other layers and is therefore not shown.

[0034] 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.

[0035] 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.

[0036] The ratio of the thickness of the first sealant layer 12 to the thickness of the paper base layer 13 is preferably 0.03 or more (3% 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 0.03, sufficient heat seal strength cannot be obtained. In addition, the ratio of the thickness of the first sealant layer 12 to the thickness of the paper base layer 13 is preferably 0.30 or less (30% or less). Even if the ratio of the thickness of the first sealant layer 12 to the thickness of the paper base layer 13 exceeds 0.30, there is no significant change in terms of preventing exposure of the paper base material, and plastic resources will be wasted. When the first sealant layer and the second sealant layer are joined by overlapping both ends 33A and 33B and heat sealing, the thickness of the resin that is the sealant layer is necessary, but when the both ends 33A and 33B are butted together and covered with the joining tape 60, the resin that is the first sealant layer on the surface may be thin.

[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.

[0039] 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.

[0040] When the adhesive layer 16, which is an adhesive resin layer, is laminated by extrusion lamination, an anchor coat (AC) layer formed by applying and drying an anchor coat agent on the surface of the layer to be laminated may be provided. The anchor coat agent may be any resin having a heat resistance temperature of 135° C. or higher, such as an anchor coat agent made of vinyl modified resin, epoxy resin, urethane resin, polyester resin, polyethyleneimine, etc. 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 its structure and an isocyanate compound as a curing agent can be preferably used. A silane coupling agent may be used in combination with this as an additive. Nitrocellulose may also be used in combination to improve heat resistance. For example, "EL-510" manufactured by Toyo-Morton Co., Ltd. may be used as the anchor coat agent. For example, "RT-80" manufactured by Toyo-Morton Co., Ltd. may be used as the curing agent.

[0041] 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.

[0042] 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:

[0043] 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.

[0044] Moreover, unbleached kraft paper, bleached kraft paper, cup base paper, or parchment paper can be used as the paper base layer 13, and an outer surface printed portion 13A made of printing ink can be provided on the paper base layer 13 by printing on the paper base layer 13. Moreover, the paper base layer 13 is responsible for maintaining the rigidity and light-blocking properties of the tube container.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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 cosmetic properties. 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. Design properties can be imparted by letterpress printing, flexographic printing, or digital printing on top of it.

[0053] Next, a bonding tape 60 for covering and bonding both ends 33A, 33B of the laminate 10 will be described with reference to FIG. 6. The bonding tape 60 is a laminate in which a first bonding layer 61 and a second bonding layer 62 are laminated on both sides of a tape substrate 63, as shown in FIG. 6. The first bonding layer 61, the second bonding layer 62, and the tape substrate 63 have different thicknesses in reality, but in FIG. 6, they are shown as having the same thickness for convenience. In addition, each layer can be bonded by dry lamination using an adhesive, but the adhesive layer formed during bonding by dry lamination is thinner than other layers and is therefore not shown. In addition, the first bonding layer 61 and the second bonding layer 62 are bonded to the tape substrate 63 by extrusion lamination.

[0054] Next, the materials of each part constituting the bonding tape 60 will be described. The first and second bonding layers 61 and 62 may include, for example, polyethylene (PE). Specifically, the first and second bonding layers 61 and 62 may be made of the following materials, similar to the first and second sealant layers 12 and 15 of the laminate 10:

[0055] The first bonding layer 61 and the second bonding layer 62 of the bonding tape 60 may be any material that can be melted and fused to each other by heat, and may be, for example, 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 others, polyvinyl acetate resins, polyester resins, polystyrene resins, and others.

[0056] Paper or resin can be used as the tape base material 63 of the bonding tape 60. For example, unbleached kraft paper, bleached kraft paper, cup base paper, and parchment paper can be used as paper. However, when using a paper-based tape, it is preferable not to use it on the inner surface because the paper edge surface may be exposed and the contents may penetrate.

[0057] When a resin is used as the tape substrate 63, a polyolefin film such as polyethylene (PE) or polypropylene (PP) can be used. As the polyethylene (PE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), etc. can be used. The same polyolefin film as that used as the first sealant layer 12 and the second sealant layer 15 of the laminate 10 may be used. Furthermore, the tape substrate 63 may be a polyethylene terephthalate (PET) layer or a nylon layer.

[0058] The bonding tape 60 may be a double-sided bonding type having a first bonding layer 61 and a second bonding layer 62, or a single-sided bonding type having only the first bonding layer 61.

[0059] 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.

[0060] Next, the first sealant layer 12 is laminated on the outer surface of the paper base layer 13 by extrusion lamination. Next, the barrier layer 14 is laminated on the inner surface of the paper base layer 13 by extrusion lamination. This prepares a laminate in which the paper base layer 13 and the barrier layer 14 are laminated. Next, the second sealant layer 15 is joined to the inner surface of the laminate of the paper base layer 13 and the barrier layer 14 prepared above by extrusion lamination or dry lamination. The joining surface of this laminate is on the barrier layer 14 side. In this manner, the laminate 10 of the body 31 is obtained. Note that the manufacturing method is not limited to the above as long as the desired laminate 10 can be obtained.

[0061] The laminate 10 of the trunk 31 thus obtained is wound into a cylindrical shape, and the end faces of both ends 33A, 33B are butted together as described above. Then, the bonding tape 60 is heat-sealed in a state of contact with the outer and inner surfaces of the laminate 10 at both ends 33A, 33B to form the trunk attachment portion 32, and the tubular trunk 31 is produced. In this case, the first sealant layer 12 provided on the outer surface side of the laminate 10 and the first bonding layer 61 (or the second bonding layer 62) of the bonding tape 60 superimposed on the first sealant layer 12 side are melted and bonded, and the second sealant layer 15 provided on the inner surface side and the first bonding layer 61 (or the second bonding layer 62) of the bonding tape 60 superimposed on the second sealant layer 15 side are melted and bonded, and the tubular trunk 31 is obtained.

[0062] 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).

[0063] 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.

[0064] <Example 1> The first sealant layer 12 is a PE resin having a thickness of 15 μm, and the paper base layer 13 is a paper having a thickness of 150 μm ("OK Blizzard Flexo" manufactured by Oji Materia Co., Ltd. (basis weight 120 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 PE film was used as the central substrate of the second sealant layer 15.

[0065] Specifically, first, an outer surface printed portion 13A was formed on the outer surface side of a 150 μm-thick paper that would become the paper base layer 13. Next, a first sealant layer 12 was laminated by extrusion lamination on the outer surface of the 150 μm-thick paper that would become the paper base layer 13. Specifically, on the outer surface of the paper base layer 13, a thermoplastic resin, PE, was laminated by extrusion lamination to form a 15 μm-thick first sealant layer 12 on the paper base layer 13.

[0066] 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.

[0067] 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 PE 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.

[0068] As a result, a laminate 10 was obtained having a structure of PE 15 μm / printing layer (ink) / paper 150 μm / EMAA 20 μm / transparent vapor-deposited PET film 12 μm / PE 20 μm / PE film 60 μm. The thickness of the first sealant layer 12 was 15 μm, and the thickness of the paper base layer 13 was 150 μm (basis weight 120 g / m 2 The thickness ratio of the first sealant layer 12 to the paper base layer 13 was 0.10 (10%), and was 0.03 or more (3% or more) and 0.30 or less (30% or less).

[0069] A bonding tape 60 was prepared using a PET film having a thickness of 25 μm as a tape base material 63, and a PE resin having a thickness of 30 μm as a first bonding layer 61 and a second bonding layer 62.

[0070] Furthermore, the laminate 10 was wound into a cylindrical shape, and the end faces of both ends 33A, 33B were butted together as described above, and the joining tape 60 was heat sealed to the outer and inner faces of the laminate 10 so as to cover both ends 33A, 33B, forming the body attachment part 32. In this manner, the cylindrical body part 31 was produced.

[0071] The inner diameter of the cylindrical body 31, which specifies the tube shape, was 40 mm. Next, the opening 34A of the cylindrical body 31 was inserted into a mold, and the cylindrical body 31 was compression molded to form a shoulder 35 and a mouth 36 at the opening 34A of the cylindrical body 31. The shoulder 35 and the mouth 36 were made of high density polyethylene (HDPE).

[0072] 1 and the opening 34B was set to 120 mm. Then, 80 ml of water was filled into the cylindrical body 31 from the other opening 34B. After that, the opening 34B was welded to form the bottom seal 39, and a sealed tube container 30 was produced.

[0073] <Example 2> The first sealant layer 12 was a PE resin having a thickness of 30 μm, and the paper base layer 13 was a paper having a thickness of 120 μm ("Nagoya Sarashi Ryuo" manufactured by Daio Paper Co., Ltd. (basis weight 100 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 100 μm thick milky PE film was used as the central substrate of the second sealant layer 15.

[0074] 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, a 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 thermoplastic resin, PE, was laminated by extrusion lamination to form a 30 μm-thick first sealant layer 12 on the paper base layer 13.

[0075] 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.

[0076] 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 100 μm-thick milky PE 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.

[0077] As a result, a laminate 10 was obtained having a structure of PE 30 μm / printing layer (ink) / paper 120 μm / EMAA 20 μm / transparent vapor-deposited PET film 12 μm / PE 20 μm / milky white PE film 100 μm. The thickness of the first sealant layer 12 was 30 μm, and the thickness of the paper base layer 13 was 120 μm (basis weight 100 g / m 2 The thickness ratio of the first sealant layer 12 to the paper base layer 13 was 0.25 (25%), and was not less than 0.03 (not less than 3%) and not more than 0.30 (not more than 30%).

[0078] Furthermore, in the same manner as in Example 1, a cylindrical body 31 was produced on the outer and inner surfaces of the laminate 10 using joining tape 60. Then, in the same manner as in Example 1, a sealed packaged product 30A filled with 80 ml of water was produced.

[0079] <Example 3> The first sealant layer 12 was made of PE resin having a thickness of 20 μm, and the paper base layer 13 was made of paper having a thickness of 180 μm ("LRD base paper" manufactured by Nippon Paper Industries Co., Ltd. (basis weight 150 g / m 2 )"), a 20 μm thick ethylene-methacrylic acid copolymer resin layer (EMAA) was used as the adhesive layer 16, a 9 μm thick aluminum foil was used as the barrier layer 14, and a 80 μm thick PE film was used as the central substrate of the second sealant layer 15.

[0080] Specifically, first, the first sealant layer 12 was laminated by extrusion lamination on the outer surface of a 180 μm-thick paper that would become the paper base layer 13. Specifically, a 20 μm-thick PE, which is a thermoplastic resin, was laminated by extrusion lamination on the outer surface of the paper base layer 13 as the first sealant layer 12. Next, an outer surface printed portion 13A was formed on the outer surface side of the 20 μm-thick PE that would become the first sealant layer 12.

[0081] Next, a 9 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 9 μm thick aluminum foil that would become the barrier layer 14, and an 80 μm thick PE film that would become the central base material of the second sealant layer 15 was bonded to the inner surface of the 9 μm thick aluminum foil that would become the barrier layer 14 by extrusion lamination, with a 30 μm thick adhesive layer made of EMAA, a thermoplastic resin.

[0082] As a result, a laminate 10 was obtained having a structure of printing layer (ink) / PE 20 μm / paper 180 μm / EMAA 20 μm / aluminum foil 9 μm / EMAA 30 μm / PE film 80 μm. The thickness of the first sealant layer 12 was 20 μm, and the thickness of the paper base layer 13 was 180 μm (basis weight 150 g / m 2 The thickness ratio of the first sealant layer 12 to the paper base layer 13 was 0.11 (11%), and was 0.03 or more (3% or more) and 0.30 or less (30% or less).

[0083] Furthermore, in the same manner as in Example 1, a cylindrical body 31 was produced on the outer and inner surfaces of the laminate 10 using joining tape 60. Then, in the same manner as in Example 1, a sealed packaged product 30A filled with 80 ml of water was produced.

[0084] <Example 4> The first sealant layer 12 was made of PE resin having a thickness of 30 μm, and the paper base layer 13 was made of paper having a thickness of 250 μm ("HC200G" manufactured by Chuetsu Pulp Industry Co., Ltd. (basis weight 200 g / m 2 )"), a 20 μm thick PE resin was used as the adhesive layer 16, and a 120 μm thick multi-layer PE film was used as the second sealant layer 15 equipped with a barrier function. The multi-layer PE film is a film with a three-layer structure of PE / EVOH / PE.

[0085] Specifically, first, a 30 μm thick PE resin that would become the first sealant layer 12 was laminated by extrusion lamination on the outer surface of a 250 μm thick paper that would become the paper base layer 13. Next, a printed portion was formed by flexographic printing on the outer surface side of the 30 μm thick PE layer that constitutes the first sealant layer 12. Next, an anchor coat layer was formed on the inner surface side of the 250 μm thick paper that would become the paper base layer 13, and a 120 μm thick multilayer PE film that would become the second sealant layer 15 was bonded by extrusion lamination using PE, a thermoplastic resin, as an adhesive layer that would be 20 μm thick.

[0086] As a result, a laminate 10 was obtained having a structure of printed layer (ink) / PE 30 μm / paper 250 μm / PE 20 μm / multilayer PE film 120 μm. The thickness of the first sealant layer 12 was 30 μm, and the thickness of the paper base layer 13 was 250 μm. The thickness ratio of the first sealant layer 12 to the paper base layer 13 was 0.12 (12%), which was 0.03 or more (3% or more) and 0.30 or less (30% or less).

[0087] A single-sided bonding tape 60 was prepared using a PET film having a thickness of 25 μm as the tape base material 63, a PE resin having a thickness of 30 μm as the first bonding layer 61, and no second bonding layer 62.

[0088] Furthermore, the laminate 10 was wound into a cylindrical shape, and the end faces of both ends 33A, 33B were butted together as described above, and the first bonding layer 61 of the bonding tape 60 was brought into contact with the outer and inner surfaces of the laminate 10 so as to cover both ends 33A, 33B, and heat sealed to form the body attachment portion 32. In this manner, the cylindrical body portion 31 was produced.

[0089] Furthermore, in the same manner as in Example 1, a sealed packaged product 30A filled with 80 ml of water was prepared.

[0090] <Example 5> The first sealant layer 12 was a PE resin having a thickness of 30 μm, and the paper base layer 13 was a paper having a thickness of 100 μm ("Ryuoh Moisture Resistant Paper" manufactured by Daio Paper Co., Ltd. (basis weight 76 g / m 2 )"), a 20 μm thick ethylene-methacrylic acid copolymer resin layer (EMAA) was used as the adhesive layer 16, a 9 μm thick aluminum foil was used as the barrier layer 14, and a 100 μm thick PE film was used as the central substrate of the second sealant layer 15.

[0091] Specifically, first, an outer surface printed portion 13A was formed on the outer surface side of a 100 μm-thick paper that would become the paper base layer 13. Next, a first sealant layer 12 was laminated by extrusion lamination on the outer surface of the 100 μm-thick paper that would become the paper base layer 13. Specifically, on the outer surface of the paper base layer 13, a thermoplastic resin, PE, was laminated by extrusion lamination to form a 30 μm-thick first sealant layer 12 on the paper base layer 13.

[0092] Next, a 20 μm thick adhesive layer 16 made of EMAA, a thermoplastic resin, was extrusion laminated onto the inner surface of the paper base layer 13, and a film made of 9 μm thick aluminum foil and 12 μm thick PET film bonded together with an adhesive to form the barrier layer 14.

[0093] Next, an anchor coat layer was formed on the inner surface of the 12 μm thick PET film, and a 100 μm thick PE film, which serves as the central substrate of the second sealant layer 15, was bonded to the 12 μm thick PET film by extrusion lamination using a 20 μm thick adhesive layer made of polyethylene (PE), a thermoplastic resin.

[0094] As a result, a laminate 10 was obtained having a structure of PE 30 μm / printing layer (ink) / paper 100 μm / EMAA 20 μm / ALM 9 μm / adhesive / PET film 12 μm / PE 20 μm / PE film 100 μm. The thickness of the first sealant layer 12 was 30 μm, and the thickness of the paper base layer 13 was 100 μm (basis weight 76 g / m 2 The thickness ratio of the first sealant layer 12 to the paper base layer 13 was 0.3 (30%), and was not less than 0.03 (not less than 3%) and not more than 0.30 (not more than 30%).

[0095] Further, only the inner surface of the cylindrical shape was sealed with joining tape 60 to prepare a body portion 31. Then, in the same manner as in Example 1, a sealed packaged product 30A filled with 80 ml of water was prepared.

[0096] <Comparative Example 1> 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.

[0097] As a result, a laminate was obtained with a structure of PE 60μm / printing layer (ink) / paper 120μm / EMAA 20μm / transparent vapor-deposited PET 12μm / PE 20μm / PE film 60μm. The thickness of the first sealant layer was 60μm, and the thickness of the paper base layer was 120μm. The thickness ratio of the first sealant layer to the paper base layer was 0.50 (50%), exceeding 0.30 (30%).

[0098] Furthermore, the laminate 10 was wound into a cylindrical shape, and both ends 33A, 33B were overlapped as described above, and the outer and inner surfaces of the laminate 10 at both ends 33A, 33B were heat-sealed to produce a cylindrical body 31. Since both ends 33A, 33B were overlapped and the first sealant layer and the second sealant layer were joined by heat sealing, no joining tape was used.

[0099] Thereafter, in the same manner as in Example 1, a sealed packaged product 30A filled with 80 ml of water was prepared.

[0100] <Comparative Example 2> A laminate was fabricated in the same manner as in Example 3, except that the first sealant layer was made of a 20 μm thick PE resin, a 80 μm thick PE film, and a 20 μm thick PE resin.

[0101] As a result, a laminate having a structure of printing layer (ink) / PE 20 μm / PE film 80 μm / PE 20 μm / paper 180 μm / EMAA 20 μm / aluminum foil 9 μm / EMAA 30 μm / PE film 80 μm was obtained. The thickness of the first sealant layer was 120 μm, and the thickness of the paper base layer 13 was 180 μm (basis weight 150 g / m 2 The thickness ratio of the first sealant layer to the paper base layer was 0.67 (67%), which exceeded 0.30 (30%).

[0102] Then, similarly to Comparative Example 1, the laminate 10 was wound into a cylindrical shape, both end portions 33A, 33B were overlapped as described above, and the outer and inner surfaces of the laminate 10 at both end portions 33A, 33B were heat-sealed to produce a cylindrical body portion 31. Since both end portions 33A, 33B were overlapped and the first sealant layer and the second sealant layer were joined by heat sealing, no joining tape was used.

[0103] Thereafter, in the same manner as in Example 1, a sealed packaged product 30A filled with 80 ml of water was prepared.

[0104] <Comparative Example 3> A laminate was fabricated in the same manner as in Example 4, except that the first sealant layer was made of a 20 μm thick PE resin, a 80 μm thick PE film, and a 20 μm thick PE resin.

[0105] As a result, a laminate 10 was obtained having a structure of printing layer (ink) / PE 20 μm / PE film 80 μm / PE 20 μm / paper 250 μm / PE 20 μm / multilayer PE film 120 μm. The thickness of the first sealant layer was 120 μm, and the thickness of the paper base layer was 250 μm. The thickness ratio of the first sealant layer to the paper base layer was 0.48 (48%), exceeding 0.30 (30%).

[0106] Then, similarly to Comparative Example 1, the laminate 10 was wound into a cylindrical shape, both end portions 33A, 33B were overlapped as described above, and the outer and inner surfaces of the laminate 10 at both end portions 33A, 33B were heat-sealed to produce a cylindrical body portion 31. Since both end portions 33A, 33B were overlapped and the first sealant layer and the second sealant layer were joined by heat sealing, no joining tape was used.

[0107] Thereafter, in the same manner as in Example 1, a sealed packaged product 30A filled with 80 ml of water was prepared.

[0108] <Evaluation> The laminates and tube containers of Examples 1 to 5 and Comparative Examples 1 to 3 were evaluated using four indices: drop resistance, shoulder adhesive strength, side seam strength, and amount of plastic reduction.

[0109] Drop resistance was evaluated by a test in which tube containers containing 80 ml of water produced in Examples 1 to 5 and Comparative Examples 1 to 3 were dropped from a height of 100 cm. The drop test consisted of three repeated vertical and three repeated horizontal drops. A vertical drop was a drop with the attached cap facing downward, and a horizontal drop was a drop with the cap and body laid flat along the horizontal direction. The body attachment part was visually inspected after the drop, and a rating of ◯ was given if no significant damage was observed in the body attachment part in any of the six vertical and horizontal drops, and a rating of × was given if significant damage was observed in any of the six drops.

[0110] For the shoulder adhesive strength, a tensile test was conducted to measure the peel strength between the body and the shoulder, using a test specimen in which the body was cut into a 15 mm wide strip in the direction of the bottom seal from the adhesive point between the body and the shoulder. The 15 mm wide strip of the body of the test specimen was taken from the body attachment part and the part of the body that was 180° opposite from the body attachment part. The body and shoulder of the test specimen were then pulled with a pair of chucks using a tensile tester. Specifically, one chuck clamped the shoulder 35, and the other chuck clamped the lower end side of the body 31 (the opening 34B, the bottom seal part 39 side) and pulled. A tensile load was applied until the body and the shoulder were separated, and the maximum load during that time was taken as the shoulder adhesive strength. The average value was then calculated for the test specimen in which the strip was attached to the body and the test specimen in which the strip was attached to the body part and the part of the body that was 180° opposite from the body attachment part. The tensile tester used was the "Tensilon Universal Testing Machine RTF" manufactured by Orientec Co., Ltd. The tensile test speed was 300 mm / min. The shoulder adhesive strength (peel strength) was measured three times for each example and comparative example, and the average value was recorded. A value of 40 N / 15 mm or more was marked with ◯, and a value of less than 40 N / 15 mm was marked with ×. In addition, in Figs. 1 and 2, the joint between the body 31 and the shoulder 35 is shown as a relatively simple structure as an example. However, in reality, the resin of the shoulder 35 is melted and joined to the body 31 by a method such as compression molding or injection molding, so that the shape of the shoulder 35 may be different from that shown in Figs. 1 and 2. Therefore, the shape of the shoulder 35 may be different from that shown in Figs. 1 and 2. In addition, the end of the body 31 may be covered with the resin of the shoulder 35.

[0111] For the side seam strength, a tensile test was performed to measure the breaking strength when the test piece breaks, using a test piece cut into a strip shape with a width of 15 mm so as to include the body attachment portion and extend in the circumferential direction. Specifically, a tensile tester pulled two opposing points of the test piece with a pair of chucks, applied a tensile load until the test piece broke, and the maximum load during that time was taken as the side seam strength. Here, "the test piece breaks" does not mean peeling of the bonding tape 60 or breaking of the bonding tape 60, but breakage of the laminate 10 itself constituting the body 31. As the tensile tester, a "Tensilon Universal Testing Machine RTF" manufactured by Orientec Co., Ltd. was used. The tensile test speed was 300 mm / min. For the side seam strength, measurements were taken three times for each of the examples and comparative examples, and the average value was recorded. 80 N / 15 mm or more was marked with ◎, 50 N / 15 mm or more but less than 80 N / 15 mm was marked with ○, and less than 50 N / 15 mm was marked with ×.

[0112] The amount of plastic reduction was calculated as the reduction ratio of the amount of plastic compared to a tube container that does not use a paper base material. Specifically, a comparison was made for the body of a tube container. The body of a tube container that does not use a paper base material, which was the subject of comparison, had a laminate thickness of 450 μm (layer structure: PE 20 μm / PE film 210 μm / adhesive layer / EVOH 15 μm / adhesive layer / PE film 210 μm), and the unit weight of the plastic contained was 427 g / m 2 The unit weight of a tube container that does not use paper is 427 g / m 2 If a reduction of 70% or more could be achieved, it was marked with ◎, if a reduction of 50% or more but less than 70% could be achieved, it was marked with ○, and if the reduction amount was less than 50%, it was marked with ×. The evaluation results for the above four indicators are shown in Table 1.

[0113] [Table 1]

[0114] In Table 1, "sealant / paper thickness ratio" indicates the ratio of the thickness of the first sealant layer to the thickness of the paper base layer, and is shown in units of 0.01. As shown in Table 1, Examples 1 to 5, in which the ratios of the thickness of the first sealant layer 12 to the thickness of the paper base layer 13 are 0.09, 0.25, 0.11, 0.12, and 0.30, showed good results in all four indices. In contrast, Comparative Examples 1 to 3, in which the ratios of the thickness of the first sealant layer 12 to the thickness of the paper base layer 13 are 0.50, 0.67, and 0.48, did not show good results in the indices of drop resistance and plastic reduction. Even when only the inner surface of the cylindrical laminate 10 was sealed using the bonding tape 60 as in Example 5, the amount of plastic reduction was sufficient, and a side seam strength sufficient for practical use was obtained. When both the outer and inner surfaces of the tubular laminate 10 were sealed using bonding tape 60 as in Examples 1 to 4, the amount of plastic reduced was sufficient and the side seam strength was equivalent to that of the comparative example in which both end portions 33A, 33B were overlapped and the first sealant layer and the second sealant layer were joined by heat sealing.

[0115] From the evaluation results shown in Table 1, it was revealed that a laminate in which the first sealant layer 12, the paper base layer 13, and the second sealant layer 15 are laminated in this order and the end faces are butted together to be used for the body of a tube container, and the ratio of the thickness of the first sealant layer 12 to the thickness of the paper base layer 13 is 0.03 to 0.30, can reduce the amount of plastic used. Furthermore, when forming a cylindrical body 31 using such a laminate, the bonding tape 60 is provided on both the inner and outer surfaces of the laminate, so that paper exposure from the outer surface side is unlikely to occur. That is, the laminate is formed by butting both ends 33A and 33B, and by heat-sealing the bonding tape 60 to the outer and inner surfaces of the laminate 10 so as to cover both ends 33A and 33B, the amount of plastic is reduced while the paper exposure from the outer surface side is unlikely to occur.

[0116] Although the preferred embodiment of the present disclosure has been described above, the present disclosure 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.

[0117] 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]

[0118] 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 30A·Packaging products 31... Body 32... Body attachment section 33A...End 33B...End 34A...Opening (upper side) 34B...Opening (lower side) 35...Shoulder 36...Mouth 37... Head molding 39 Bottom seal 60.... Joint tape 61...1st bonding layer 62...Second bonding layer 63 Tape base material

Claims

1. a laminate for use in a body portion of a tube container, in which at least a first sealant layer, a paper base layer, a first adhesive layer, a barrier layer, a second adhesive layer, and a second sealant layer are laminated in this order; A tube container having a body part formed by butting both ends of the laminate and joining the both ends with a joining tape so as to cover the both ends, The bonding tape is provided on both the inner and outer surfaces of the laminate, The bonding tape is a laminate in which at least a first bonding layer is laminated on one surface of a tape base material and at least a second bonding layer is laminated on the other surface of the tape base material, the first sealant layer is polyethylene having a thickness of 20 μm; The paper base layer has a basis weight of 150 g / m 2 , The first adhesive layer is an ethylene-methacrylic acid copolymer resin having a thickness of 20 μm, The barrier layer is an aluminum foil having a thickness of 9 μm. The second adhesive layer is an ethylene-methacrylic acid copolymer resin having a thickness of 20 μm, the second sealant layer is polyethylene having a thickness of 80 μm; The tape base material of the bonding tape is a PET film having a thickness of 25 μm, The first and second bonding layers of the bonding tape are made of polyethylene having a thickness of 30 μm; The side seam strength of the tube container is 80N / 15mm or more, the joining tape does not break, A tube container, wherein the peel strength between the body and the shoulder joined to the body is 40 N / 15 mm or more at both the body bonding portion and the portion 180° opposite to the body bonding portion.

2. a laminate for use in a body portion of a tube container, in which at least a first sealant layer, a paper base layer, a first adhesive layer, a barrier layer, a second adhesive layer, and a second sealant layer are laminated in this order; A tube container having a body part formed by butting both ends of the laminate and joining the both ends with a joining tape so as to cover the both ends, The bonding tape is provided on both the inner and outer surfaces of the laminate, The bonding tape is a laminate in which at least a first bonding layer is laminated on one surface of a tape base material and at least a second bonding layer is laminated on the other surface of the tape base material, the first sealant layer is polyethylene having a thickness of 30 μm; The paper base layer has a basis weight of 76 g / m 2 , The first adhesive layer is an ethylene-methacrylic acid copolymer resin having a thickness of 20 μm, The barrier layer is an aluminum foil having a thickness of 9 μm. The second adhesive layer is an ethylene-methacrylic acid copolymer resin having a thickness of 20 μm, The second sealant layer is a laminate of a PET film having a thickness of 12 μm, a polyethylene film having a thickness of 20 μm, and a polyethylene film having a thickness of 100 μm, in this order; The tape base material of the bonding tape is a PET film having a thickness of 25 μm, The first and second bonding layers of the bonding tape are made of polyethylene having a thickness of 30 μm; The side seam strength of the tube container is 80N / 15mm or more, the joining tape does not break, A tube container, wherein the peel strength between the body and the shoulder joined to the body is 40 N / 15 mm or more at both the body bonding portion and the portion 180° opposite to the body bonding portion.

3. a laminate for use in a body portion of a tube container, in which at least a first sealant layer, a paper base layer, a first adhesive layer, a barrier layer, a second adhesive layer, and a second sealant layer are laminated in this order; A tube container having a body part formed by butting both ends of the laminate and joining the both ends with a joining tape so as to cover the both ends, The bonding tape is provided on both the inner and outer surfaces of the laminate, The bonding tape is a laminate in which at least a first bonding layer is laminated on one surface of a tape base material and at least a second bonding layer is laminated on the other surface of the tape base material, the first sealant layer is polyethylene having a thickness of 15 μm; The paper base layer has a basis weight of 120 g / m 2 , The first adhesive layer is an ethylene-methacrylic acid copolymer resin having a thickness of 20 μm, The barrier layer is a transparent vapor-deposited PET film having a thickness of 12 μm, the second adhesive layer is polyethylene having a thickness of 20 μm; the second sealant layer is a 60 μm polyethylene film; The tape base material of the bonding tape is a PET film having a thickness of 25 μm, The first and second bonding layers of the bonding tape are made of polyethylene having a thickness of 30 μm; The side seam strength of the tube container is 80N / 15mm or more, the joining tape does not break, A tube container, wherein the peel strength between the body and the shoulder joined to the body is 40 N / 15 mm or more at both the body bonding portion and the portion 180° opposite to the body bonding portion.

4. a laminate for use in a body portion of a tube container, in which at least a first sealant layer, a paper base layer, a first adhesive layer, a barrier layer, a second adhesive layer, and a second sealant layer are laminated in this order; A tube container having a body part formed by butting both ends of the laminate and joining the both ends with a joining tape so as to cover the both ends, The bonding tape is provided on both the inner and outer surfaces of the laminate, The bonding tape is a laminate in which at least a first bonding layer is laminated on one surface of a tape base material and at least a second bonding layer is laminated on the other surface of the tape base material, the first sealant layer is polyethylene having a thickness of 30 μm; The paper base layer has a basis weight of 100 g / m 2 , The first adhesive layer is an ethylene-methacrylic acid copolymer resin having a thickness of 20 μm, The barrier layer is a transparent vapor-deposited PET film having a thickness of 12 μm, the second adhesive layer is polyethylene having a thickness of 20 μm; the second sealant layer is a 100 μm milky white polyethylene film; The tape base material of the bonding tape is a PET film having a thickness of 25 μm, The first and second bonding layers of the bonding tape are made of polyethylene having a thickness of 30 μm; The side seam strength of the tube container is 80N / 15mm or more, the joining tape does not break, A tube container, wherein the peel strength between the body and the shoulder joined to the body is 40 N / 15 mm or more at both the body bonding portion and the portion 180° opposite to the body bonding portion.

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