Laminate, tube container and tube container with cap

Abstract

To provide a laminate, a tube container and a tube container with a cap capable of improving slipperiness.SOLUTION: There is provided a laminate 10 which has a first sealant layer 11, a base material layer 13, a barrier layer 17 and a second sealant layer 12, arranged in order from an outer surface 101 to an inner surface 102. The inner surface 102 is provided with a concavo-convex structure including a plurality of concave portions 103 and a plurality of convex portions 104. The surface roughness Sa of the inner surface 102 is 7 μm or more and 20 μm or less and the arithmetic mean curvature Spc of the convex portions 104 is 800 μm or more and 1500 μm or less, as measured in accordance with ISO 25178-2:2012. The coefficient of static friction of the inner surface 102 against metal is 0.40 or more and 0.50 or less and the coefficient of dynamic friction is 0.35 or more and 0.45 or less. The barrier layer 17 includes an aluminum foil.SELECTED DRAWING: Figure 2A

Description

Technical Field

[0001] The present disclosure relates to a laminate, a tube container, and a tube container with a cap.

Background Art

[0002] Conventionally, as a tube container, a laminated tube container is known. Generally, a laminated tube container is composed of a body tube (laminated tube) and a head member including a mouth part. The manufacturing process of a laminated tube container consists of a process of forming a body tube made of a laminate layer into a tube and a process of forming a head member for the body tube.

[0003] Among these, in the process of forming a body tube made of a laminate layer into a tube, the laminate is rolled up, and the resin layer (sealant layer) surface, which is the outermost layer of both edge portions of the laminate, and the resin layer (sealant layer) surface, which is the innermost layer, are overlapped. Then, for example, a welded portion is welded by a seal member that performs heat sealing to manufacture a body tube (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in conventional tube containers, the slipperiness of the resin layer surface, which is the innermost layer, may be insufficient, and scratches may occur on the resin layer surface, which is the innermost layer, when forming the body tube. When scratches occur on the resin layer surface, which is the innermost layer, there is a problem that foreign substances (for example, precipitated pigments) resulting from the scratches adhere to the seal member, reducing the bonding property of the laminate. In addition, there is also a possibility that the production line will be contaminated due to the adhesion of foreign substances to the production line. Furthermore, when the slipperiness of the resin layer surface, which is the innermost layer, is insufficient, there is a risk that the processing timing of the forming member and the movement timing of the laminate will be misaligned due to the reduced transportability of the laminate. Thus, when the processing timing of the forming member and the movement timing of the laminate are misaligned, wrinkles or the like may occur in the tube-forming portion. In particular, when the process of forming the body tube is performed at high speed, the possibility of scratches occurring on the resin layer surface, which is the innermost layer, or the possibility of not being able to form the body tube increases.

[0006] The present disclosure has been made in consideration of such points, and an object thereof is to provide a laminate, a tube container, and a tube container with a cap that can improve slipperiness.

Means for Solving the Problems

[0007] Embodiments of the present disclosure relate to the following [1] to [5].

[0008] [1] A first sealant layer, a base material layer, a barrier layer, and a second sealant layer are provided in order from the outer surface toward the inner surface. An uneven structure including a plurality of concave portions and a plurality of convex portions is provided on the inner surface. The surface roughness Sa of the inner surface, measured in accordance with ISO 25178-2:2012, is 7 μm or more and 20 μm or less. The arithmetic mean curvature Spc of the convex portions, measured in accordance with ISO 25178-2:2012, is 800 μm or more and 1500 μm or less. The static friction coefficient of the inner surface with respect to metal is 0.35 or more and 0.60 or less. The coefficient of kinetic friction of the inner surface with respect to the metal is 0.32 or more and 0.58 or less, The barrier layer is a laminate including an aluminum foil.

[0009] [2] The first sealant layer and the second sealant layer are the laminate according to [1], each including polyethylene.

[0010] [3] The base material layer is the laminate according to [1] or [2], including polyethylene or polyethylene terephthalate.

[0011] [4] In a tube container, a body tube formed by overlapping and joining the opposing edge portions of the laminate according to any one of [1] to [3], and a head member joined to one end of the body tube, the tube container comprising the same.

[0012] [5] In a capped tube container, the tube container according to [4], and a cap attached to the head member, the capped tube container comprising the same. [Advantages of the Invention]

[0013] According to the present disclosure, the slipperiness of the laminate can be improved. [Brief Description of the Drawings]

[0014]

Figure 1

Figure 2A

Figure 2B

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment will be described with reference to the drawings. FIGS. 1 to 7 are diagrams showing an embodiment. Each of the diagrams shown below is a schematic diagram. Therefore, the size and shape of each part are exaggerated as appropriate for easy understanding. Further, it can be implemented with appropriate modifications without departing from the technical idea. In each of the diagrams shown below, the same parts are denoted by the same reference numerals, and some detailed descriptions may be omitted. Also, the numerical values and material names of the dimensions of each member described in this specification are examples as an embodiment, and are not limited thereto, and can be appropriately selected and used. In this specification, terms specifying shapes and geometric conditions, such as terms like parallel, orthogonal, and perpendicular, shall be interpreted to include not only the strictly meant state but also substantially the same state.

[0016] As shown in FIG. 1, the capped tube container 40A according to the present embodiment includes a tube container 40 and a cap 49 attached to a head member 43 (to be described later) of the tube container 40.

[0017] Among these, the tube container 40 includes a body tube 41 which is a laminated tube, and a head member 43 joined to one end 42 of the body tube 41. The body tube 41 has a generally cylindrical shape as a whole. The body tube 41 is composed of a laminate 10 which is a packaging material for tube containers. In this case, the body tube 41 may be configured such that the outer surface of the packaging material for tube containers (i.e., the outer surface 101 of the laminate 10 described later) faces the side opposite to the content side, and the inner surface (i.e., the inner surface 102 of the laminate 10 described later) faces the content side.

[0018] The body tube 41 has a body seal portion 44 where the packaging materials for tube containers are joined to each other. This body seal portion 44 is formed along the longitudinal direction of the body tube 41. Such a body tube 41 may be obtained, for example, by rolling the packaging material for tube containers into a cylindrical shape, overlapping the opposing edge portions of the packaging material for tube containers, and joining them to each other by, for example, heat sealing.

[0019] Further, the body tube 41 has a bottom seal portion 45 where the packaging materials for tube containers are joined to each other. This bottom seal portion 45 is a portion where the packaging materials for tube containers in the vicinity of the opening (not shown) formed at the other end 46 of the body tube 41 are joined to each other after filling an appropriate amount of the content C.

[0020] The head member 43 has a shoulder 47 and a mouth portion 48. A cap 49 is adapted to be attached to the mouth portion 48. The head member 43 is formed, for example, by a compression molding method. Also, the head member 43 is made of a resin material such as high density polyethylene (HDPE), for example.

[0021] Next, the layer structure of the laminate 10 will be described. FIGS. 2A and 2B show an example of the layer structure of the laminate 10 constituting the body tube 41. As shown in FIGS. 2A and 2B, the laminate 10 includes a first sealant layer 11, a base material layer 13, a barrier layer 17, and a second sealant layer 12 arranged in order from the outer surface 101 toward the inner surface 102.

[0022] Specifically, as shown in FIG. 2A, the laminate 10 includes, in this order, a first sealant layer 11, a first adhesive layer 14a, a first anchor coat layer 15a, a base material layer 13, a printing layer 16, a second adhesive layer 14b, a vapor deposition layer 19a, a first intermediate layer 18a, a second anchor coat layer 15b, a third adhesive layer 14c, a second intermediate layer 18b, a third anchor coat layer 15c, a fourth adhesive layer 14d, a barrier layer 17, a fourth anchor coat layer 15d, a fifth adhesive layer 14e, and a second sealant layer 12. Further, the laminate 10 may further include a varnish layer 19b provided on the outer surface 101 side of the first sealant layer 11. In the example shown in FIG. 2A, the varnish layer 19b constitutes the outer surface 101 of the laminate 10, and the second sealant layer 12 constitutes the inner surface 102 of the laminate 10.

[0023] Also, as shown in FIG. 2B, the laminate 10 includes, in this order, a first sealant layer 11, a first adhesive layer 14a, a first anchor coat layer 15a, a base material layer 13, a printing layer 16, a second anchor coat layer 15b, a second adhesive layer 14b, an intermediate layer 18, a third anchor coat layer 15c, a third adhesive layer 14c, a barrier layer 17, a fourth adhesive layer 14d, and a second sealant layer 12. In the example shown in FIG. 2A, the first sealant layer 11 constitutes the outer surface 101 of the laminate 10, and the second sealant layer 12 constitutes the inner surface 102 of the laminate 10.

[0024] Hereinafter, each layer of the laminate 10 will be described.

[0025] First sealant layer The first sealant layer 11 is a layer for adhering laminates 10 to each other, and as the material constituting the first sealant layer 11, any material that melts and fuses by heat may be used. For example, a film of polyolefin can be used for the first sealant layer 11. More specifically, as the first sealant layer 11, for example, a low-density polyethylene (LDPE) film, a medium-density polyethylene (MDPE) film, a high-density polyethylene (HDPE) film, a linear (linear) low-density polyethylene (LLDPE) film, a polypropylene film, a polyolefin resin such as polyethylene or polypropylene modified with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, and other unsaturated carboxylic acids, an acid-modified polyolefin resin film, a polyvinyl acetate resin film, a polyester resin film, a polystyrene resin film, a film composed of one or more of other resins such as polyacrylonitrile, saturated polyester, and polyvinyl alcohol can be used.

[0026] Here, low-density polyethylene is polyethylene having a density of 910 kg / m 3 or more and 930 kg / m 3 or less. Medium-density polyethylene is polyethylene having a density of 930 kg / m 3 or more and 942 kg / m 3 or less. Further, high-density polyethylene is polyethylene having a density of 942 kg / m 3 or more. Low-density polyethylene can be obtained, for example, by polymerizing ethylene at a high pressure of 1000 atmospheres or more and less than 2000 atmospheres. Medium-density polyethylene and high-density polyethylene can be obtained, for example, by polymerizing ethylene at a medium pressure or low pressure of 1 atmosphere or more and less than 1000 atmospheres.

[0027] Note that medium-density polyethylene and high-density polyethylene may partially contain a copolymer of ethylene and an α-olefin. Also, even when ethylene is polymerized at medium pressure or low pressure, if a copolymer of ethylene and an α-olefin is included, medium-density or low-density polyethylene can be produced. The linear low-density polyethylene described above is such a polyethylene. Linear low-density polyethylene is obtained by copolymerizing an α-olefin with a linear polymer obtained by polymerizing ethylene at medium pressure or low pressure to introduce short-chain branches. Examples of α-olefins include 1-butene (C 4 ), 1-hexene (C 6 ), 4-methylpentene (C 6 ), 1-octene (C 8 ), and the like. The density of linear low-density polyethylene is, for example, 915 kg / m 3 or more and 945 kg / m 3 or less.

[0028] The first sealant layer 11 may contain polyethylene or may contain linear low-density polyethylene. In this case, the second sealant layer 12 may also contain polyethylene or may contain linear low-density polyethylene. When the first sealant layer 11 contains linear low-density polyethylene, the bonding property between the first sealant layer 11 and the second sealant layer 12 can be improved when the first sealant layer 11 and the second sealant layer 12 are joined to each other. As the linear low-density polyethylene, for example, Ultra Zex (registered trademark), 2021I (product name) manufactured by Prime Polymer Co., Ltd., Ultra Zex (registered trademark), 3520L (product name) manufactured by Prime Polymer Co., Ltd., Kernel (registered trademark), KMB-16F (product name) manufactured by Japan Polyethylene Corporation can be used.

[0029] In this embodiment, as the heat-sealable film described above, for example, one or two or more of the above resins are used as the main component, and a desired additive is arbitrarily added thereto to prepare a resin composition. Then, the resin composition prepared above is used, and for example, a film or a sheet can be formed using a T-die method, an inflation method, or other molding methods.

[0030] In addition, as the material of the first sealant layer 11 described above, for example, an anti-blocking agent, a lubricant (such as fatty acid amide), a flame retardant, an inorganic or organic filler, etc. may be arbitrarily added and used.

[0031] Also, in this embodiment, the thickness of the first sealant layer 11 is preferably 50 μm or more and 250 μm or less.

[0032] Base material layer and intermediate layer The base material layer 13, the first intermediate layer 18a, the second intermediate layer 18b, and the intermediate layer 18 (hereinafter, also simply referred to as the base material layer 13, etc.) are, for example, layers for supporting the first sealant layer 11 and the second sealant layer 12 and increasing the strength of the entire laminate 10. As the material constituting the base material layer 13, etc., for example, a polyester resin, a polyamide resin, a polyaramide resin, a polyolefin resin, a polycarbonate resin, a polyacetal resin, a fluororesin, a film or sheet of other tough resins, etc. can be used. As the polyolefin resin, for example, an extruded low-density polyethylene, a linear low-density polyethylene, a medium-density polyethylene, or a high-density polyethylene film can be used.

[0033] The base material layer 13 may contain polyethylene or polyethylene terephthalate. Similarly, the first intermediate layer 18a, the second intermediate layer 18b, and the intermediate layer 18 may contain polyethylene or polyethylene terephthalate.

[0034] In addition, as the film or sheet of the resin described above, any of an unstretched film, a stretched film stretched in one axial direction or two axial directions, or the like can be used. Among them, in the present embodiment, a biaxially stretched polyester-based resin film is preferable because it is excellent in terms of printability.

[0035] In the present embodiment, the thicknesses of the base material layer 13 and the like are preferably 10 μm or more and 25 μm or less, respectively.

[0036] Second sealant layer The second sealant layer 12 is a layer for bonding the laminates 10 to each other, and as the material constituting the second sealant layer 12, for example, the same material as the above-described first sealant layer 11 can be used.

[0037] As described above, the second sealant layer 12 is a layer constituting the inner surface 102 of the laminate 10. In this case, as shown in FIG. 3, an uneven structure including a plurality of concave portions 103 and a plurality of convex portions 104 is provided on the inner surface 102. The shapes of the respective concave portions 103 are different from each other. Similarly, the shapes of the respective convex portions 104 are different from each other. Further, the respective concave portions 103 and the respective convex portions 104 are irregularly arranged. The concave portions 103 and the convex portions 104 are portions formed by transferring an uneven structure provided on the surface of a cooling roll 86 (see FIG. 5) described later.

[0038] In the present embodiment, the surface roughness Sa of the inner surface 102 measured in accordance with ISO 25178-2:2012 is 7 μm or more and 20 μm or less. The surface roughness Sa of the inner surface 102 means the average of the height (absolute value) of the concave portion 103 and the height (absolute value) of the convex portion 104 with respect to a reference plane (average plane) S (see FIG. 3).

[0039] In addition, the arithmetic mean curvature Spc of the convex portion 104, measured in accordance with ISO 25178-2:2012, is 800 μm or more and 1500 μm or less. Note that the arithmetic mean curvature Spc of the inner surface 102 refers to the average of the curvatures at the tops of the convex portions 104. The larger the arithmetic mean curvature Spc, the smaller the radius of curvature at the top of the convex portion 104, and the more pointed the shape of the convex portion 104 becomes. The smaller the arithmetic mean curvature Spc, the larger the radius of curvature at the top of the convex portion 104, and the more rounded the shape of the convex portion 104 becomes.

[0040] (Surface roughness Sa measurement test · Arithmetic mean curvature Spc measurement test) The surface roughness Sa and the arithmetic mean curvature Spc are measured by a method conforming to ISO 25178-2:2012. At this time, the surface roughness Sa and the arithmetic mean curvature Spc are measured within a region of 1000 μm × 1000 μm on the inner surface 102 of the laminate 10. Further, the measurement is performed using a shape analysis laser microscope (Keyence Corporation VK-8710). At this time, three test pieces are prepared, and for each test piece, the surface roughness Sa and the arithmetic mean curvature Spc are measured. Then, for each of the surface roughness Sa and the arithmetic mean curvature Spc, the average value of the values of the three test pieces is taken as the surface roughness Sa or the arithmetic mean curvature Spc of the laminate 10.

[0041] In addition, in this embodiment, the coefficient of static friction of the inner surface 102 with respect to the metal is 0.40 or more and 0.50 or less.

[0042] Also, the coefficient of kinetic friction of the inner surface 102 with respect to the metal is 0.35 or more and 0.45 or less.

[0043] Note that the coefficient of static friction and the coefficient of kinetic friction of the inner surface 102 with respect to the metal may be adjusted by selecting the resin material used for the second sealant layer 12 as described later, or may be adjusted by applying a varnish or the like to the second sealant layer 12. Also, the coefficient of kinetic friction of the inner surface 102 with respect to the metal can be measured by the following static friction coefficient measurement test · kinetic friction coefficient measurement test.

[0044] (Static friction coefficient measurement test · Kinetic friction coefficient measurement test) The static friction coefficient and the kinetic friction coefficient are measured by a method conforming to JIS K 7125:1999. Specifically, in accordance with 8.2 "Measurement of Films When Contacting Metals or Other Materials" of JIS K 7125:1999, the static friction coefficient and the kinetic friction coefficient are measured. At this time, first, the measuring device and the laminate are stabilized in an environment of 20°C. Also, the laminate is cut into test pieces of 80 mm × 200 mm using a specified mold. Also, a mating material that contacts the cut test piece is prepared. In this case, as the mating material, one made of a metal, for example, stainless steel, is used. Next, the test piece is placed on the mating material such that the second sealant layer 12 faces the mating material, and a sliding piece is placed thereon. The weight of the sliding piece is set to 200 g. Then, the test piece and the sliding piece are brought into close contact so as not to slide. Next, the sliding piece is pulled at a speed of 100 mm / min, the static frictional force (N) and the kinetic frictional force (N) between the test piece and the mating material are measured, and the static friction coefficient and the kinetic friction coefficient are calculated by dividing the static frictional force and the kinetic frictional force by the normal force (1.96 N) of the sliding piece. The kinetic friction coefficient is obtained from the average value up to the first 30 mm after the start of the relative displacement motion between the test piece and the mating material, ignoring the peak of the static frictional force. Note that the load cell is directly connected to the sliding piece. At this time, three test pieces are prepared, and for each test piece, the static friction coefficient and the kinetic friction coefficient are measured. Then, for each of the surface static friction coefficient and the kinetic friction coefficient, the average value of the values of the three test pieces is taken as the static friction coefficient or the kinetic friction coefficient of the laminate 10.

[0045] As described above, in the present embodiment, the surface roughness Sa of the inner surface measured in accordance with ISO 25178-2:2012 is 7 μm or more, the arithmetic mean curvature Spc of the convex portion 104 measured in accordance with ISO 25178-2:2012 is 800 μm or more, and the kinetic friction coefficient of the inner surface 102 with respect to the metal is 0.32 or more. Thereby, the laminate 10 can be easily wound around the inner seal member 80 described later. For this reason, the productivity of the body tube 41 can be improved.

[0046] In addition, in the present embodiment, the surface roughness Sa of the inner surface, measured in accordance with ISO 25178-2:2012, is 20 μm or less, the arithmetic mean curvature Spc of the convex portion 104, measured in accordance with ISO 25178-2:2012, is 1500 μm or less, and the coefficient of kinetic friction of the inner surface 102 with respect to the metal is 0.58 or less. Thereby, when the laminate 10 is wound around the inner seal member 80 described later, it is possible to suppress the occurrence of scratches on the second sealant layer 12. Further, since it is possible to suppress the occurrence of scratches on the second sealant layer 12, it is possible to suppress the adhesion of foreign matters (for example, precipitated pigments, etc.) caused by the scratches on the second sealant layer 12 to the inner seal member 80 and the like described later.

[0047] Furthermore, according to the present embodiment, the coefficient of static friction of the inner surface 102 with respect to the metal is 0.35 or more. Thereby, even when the conveyance of the laminate 10 stops during the production of the body tube 41, when the conveyance of the laminate 10 is restarted, it is possible to easily wind the laminate 10 around the inner seal member 80 described later. Therefore, the productivity of the body tube 41 can be improved. In addition, since the coefficient of static friction of the inner surface 102 with respect to the metal is 0.60 or less, it is possible to suppress the occurrence of scratches on the second sealant layer 12 even when the conveyance of the laminate 10 stops during the production of the body tube 41.

[0048] In the present embodiment, the thickness of the second sealant layer 12 is preferably 50 μm or more and 250 μm or less.

[0049] Adhesive layer Adhesive layers such as the first adhesive layer 14a, the second adhesive layer 14b, the third adhesive layer 14c, the fourth adhesive layer 14d, and the fifth adhesive layer 14e are layers for adhering the first sealant layer 11, the base material layer 13, the second sealant layer 12, etc. to each other. The material used for this adhesive layer can be appropriately selected according to the resin constituting the layer to be adhered.

[0050] As the subsequent layer, for example, anchor coating agents such as isocyanate-based (urethane-based), polyethyleneimine-based, polybutadiene-based, and organotitanium-based agents, or polyurethane-based, polyacrylic-based, polyester-based, epoxy-based, polyvinyl acetate-based, cellulose-based, and other adhesives for lamination can be arbitrarily used.

[0051] Also, as the adhesive layer, for example, polyethylene, polypropylene, linear low-density polyethylene, ethylene-vinyl alcohol, ethylene-methacrylic acid copolymer (EMAA), ethylene-acrylic acid copolymer, ionomer, maleic anhydride-modified polyolefin resin, etc. can be preferably used.

[0052] In addition, in the present embodiment, the thickness of the adhesive layer is preferably 3 μm or more and 60 μm or less.

[0053] Also, as a method of laminating the first sealant layer 11, the base material layer 13, the second sealant layer 12, etc. with each other, for example, it can be carried out by a wet lamination method, a dry lamination method, a solventless dry lamination method, an extrusion lamination method, a T-die coextrusion molding method, a coextrusion lamination method, an inflation method, or any other method. Further, when performing the above-described lamination, if necessary, pretreatment such as corona treatment and ozone treatment can be applied to the film.

[0054] Anchor coat layer Anchor coat layers such as the first anchor coat layer 15a, the second anchor coat layer 15b, the third anchor coat layer 15c, and the fourth anchor coat layer 15d are layers for enhancing the adhesion between layers. This anchor coat layer is formed by applying an anchor coat agent and drying it. Examples of the anchor coat agent include an anchor coat agent composed of any resin having a heat resistance temperature of 135°C or higher, such as a vinyl-modified resin, an epoxy resin, a urethane resin, a polyester resin, a polyethyleneimine, etc. In particular, an anchor coat agent that 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. Also, a silane coupling agent may be used in combination as an additive, and nitrocellulose may be used in combination to enhance heat resistance. The dried anchor coat layer is preferably 0.3 μm or more and 10 μm or less.

[0055] Printing layer The printing layer 16 is a layer on which printing such as a pattern is performed, and is a layer for improving the design property of the laminate 10. As the printing layer 16, one or more kinds of ordinary ink vehicles are used as the main components, and if necessary, one or more kinds of a plasticizer, a stabilizer, an antioxidant, a light stabilizer, an ultraviolet absorber, a curing agent, a crosslinking agent, a lubricant, an antistatic agent, a filler, and other additives are arbitrarily added. Further, a colorant such as a dye or a pigment is added, and an ink composition obtained by sufficiently kneading with a solvent, a diluent, etc. can be used. As such an ink vehicle, for example, linseed oil, tung oil, soybean oil, hydrocarbon oil, rosin, rosin ester, rosin-modified resin, shellac, alkyd resin, phenolic resin, maleic acid resin, natural resin, hydrocarbon resin, polyvinyl chloride-based resin, polyacetic acid-based resin, polystyrene-based resin, polyvinyl butyral resin, acrylic or methacrylic-based resin, polyamide-based resin, polyester-based resin, polyurethane-based resin, epoxy-based resin, urea resin, melamine resin, amino alkyd-based resin, nitrocellulose, ethyl cellulose, chlorinated rubber, cyclized rubber, etc. can be used in combination of one or more kinds. The printing method may be, in addition to gravure printing, letterpress printing, screen printing, transfer printing, flexographic printing, or other printing methods.

[0056] Barrier layer The barrier layer 17 is a layer for suppressing the permeation of oxygen gas, water vapor, etc. As the barrier layer 17, for example, a gas barrier material against oxygen gas, water vapor, etc., a light shielding material against sunlight, etc., or a material having fragrance retention property against the contents can be used. In the present embodiment, the barrier layer 17 contains an aluminum foil. By using an aluminum foil as the barrier layer 17, the production of the laminate 10 becomes easy. The thickness of the barrier layer 17 can be about 5 μm or more and 20 μm or less.

[0057] Vapor deposition layer The vapor deposition layer 19a is a layer for suppressing the permeation of oxygen gas, water vapor, etc. As the vapor deposition layer 19a, for example, a gas barrier material against oxygen gas, water vapor, etc., a light-shielding material against sunlight, etc., or a material having fragrance retention properties for the contents can be used. The vapor deposition layer 19a can be formed by a conventionally known method. In this case, the vapor deposition layer 19a may be a transparent vapor deposition layer composed of an inorganic oxide vapor deposition layer.

[0058] Also, when using a metal vapor deposition layer such as aluminum as the vapor deposition layer 19a, for example, physical vapor deposition methods such as vacuum vapor deposition method, sputtering method, ion plating method, cluster ion beam method (Physical Vapor Deposition method, PVD method), etc. can be utilized to form a vapor deposition thin film of a metal such as aluminum on the intermediate layer 18 or the like.

[0059] When using a metal vapor deposition layer of aluminum as the vapor deposition layer 19a, the thickness of the vapor deposition layer 19a is usually preferably about 50 Å or more and 3000 Å or less, and particularly preferably about 100 Å or more and 2000 Å or less. Further, the surface of the intermediate layer 18 that supports the above-mentioned aluminum vapor deposition thin film can be coated with, for example, a vapor deposition primer or the like in advance to enhance the adhesion of the vapor deposition film, and other required pretreatment can be arbitrarily performed.

[0060] Also, the vapor deposition layer 19a may be a transparent vapor deposition layer formed by a conventionally known method. In this case, the vapor deposition layer 19a may be a transparent vapor deposition layer composed of an inorganic oxide vapor deposition layer.

[0061] As the transparent vapor deposition layer, for example, vapor deposition layers of oxides such as silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y), etc. can be used. Particularly, for a tube container, it is preferable to provide a vapor deposition layer of aluminum oxide or silicon oxide.

[0062] The notation of the inorganic oxide is, for example, SiOX , AlO X such as MO X (However, in the formula, M represents an inorganic element, and the value of X varies depending on the inorganic element.) It is represented by. As the range of the value of X, for silicon (Si), it is 0 to 2, for aluminum (Al), it is 0 to 1.5, for magnesium (Mg), it is 0 to 1, for calcium (Ca), it is 0 to 1, for potassium (K), it is 0 to 0.5, for tin (Sn), it is 0 to 2, for sodium (Na), it is 0 to 0.5, for boron (B), it is 0 to 1.5, for titanium (Ti), it is 0 to 2, for lead (Pb), it is 0 to 2, for zirconium (Zr), it can take values in the range of 0 to 2, and for yttrium (Y), it can take values in the range of 0 to 1.5. In the above, when X = 0, it is a complete inorganic simple substance (pure substance), which is not transparent, and the upper limit of the range of X is the value of complete oxidation. For packaging materials, silicon (Si) and aluminum (Al) are preferably used, and for silicon (Si), those with values in the range of 1.0 to 2.0 and for aluminum (Al), those with values in the range of 0.5 to 1.5 can be used.

[0063] Although the thickness of the transparent vapor deposition layer varies depending on the type of inorganic oxide used, etc., for example, it is preferably formed by arbitrarily selecting within the range of 50 Å or more and 2000 Å or less, preferably 100 Å or more and 1000 Å or less. For example, in the case of a vapor deposition layer of aluminum oxide or silicon oxide, a thickness of 50 Å or more and 500 Å or less, and more preferably 100 Å or more and 300 Å or less is desirable.

[0064] The transparent vapor deposition layer can be formed on the intermediate layer 18 etc. using the following formation methods. As the formation method of the vapor deposition layer, for example, physical vapor deposition methods (Physical Vapor Deposition method, PVD method) such as vacuum vapor deposition method, sputtering method, and ion plating method, or chemical vapor deposition methods (Chemical Vapor Deposition method, CVD method) such as plasma chemical vapor deposition method, thermal chemical vapor deposition method, and photo chemical vapor deposition method can be mentioned. Specifically, using a roller type vapor deposition layer forming device, the vapor deposition layer can be formed on the forming roller.

[0065] Other layers As another layer, for example, a concealing layer may be provided. The concealing layer is a layer for preventing the color change or variation of the intermediate layer 18 or the like from affecting the color of the pattern or the like of the printing layer 16. An olefin resin can be used for the concealing layer. More specifically, as the concealing layer, a polyethylene film such as a low-density polyethylene, linear low-density polyethylene or medium-density polyethylene film is preferably used. These polyethylene films may be colored, for example, like an opaque polyethylene film. The thickness of the concealing layer is preferably, for example, 50 μm or more and 200 μm.

[0066] In the tube container 40 according to the present embodiment, the joining of the body tube 41 and the head member 43 can be performed by heat welding when the head member 43 is formed by a compression molding method, as will be described later. However, it is not limited thereto, and the joining of the body tube 41 and the head member 43 may be performed by an injection molding method.

[0067] Next, with reference to FIGS. 4(a)-(d) and 5, a method for manufacturing the laminate 10 will be described, and with reference to FIGS. 6(a)-(c) and 7(a)-(b), a method for manufacturing the tube container 40 will be described.

[0068] First, with reference to FIGS. 4(a)-(d) and 5, a method for manufacturing the laminate 10 will be described.

[0069] In this case, first, as shown in FIG. 4(a), a first intermediate 10a of the laminate 10 is produced.

[0070] When producing the first intermediate 10a, first, as the base material layer 13, for example, a biaxially stretched polyethylene terephthalate film is prepared.

[0071] Next, for example, a urethane-based gravure ink is applied onto a biaxially stretched polyethylene terephthalate film as the base material layer 13 by gravure printing, and then the ink is dried to form the printing layer 16. In this way, the first intermediate 10a of the laminate 10 is obtained (see Fig. 4(a)).

[0072] Also, as shown in Fig. 4(b), the second intermediate 10b of the laminate 10 is produced. The second intermediate 10b may be produced by the dry lamination method.

[0073] At this time, first, as the first intermediate layer 18a, for example, a biaxially stretched polyethylene terephthalate film provided with a vapor deposition layer 19a is prepared.

[0074] Next, an adhesive is applied onto the vapor deposition layer 19a to form an adhesive layer (the second adhesive layer 14b). Also, through this adhesive layer, the first intermediate layer 18a and the first intermediate 10a are bonded together. In this way, the second intermediate 10b of the laminate 10 is obtained (see Fig. 4(b)).

[0075] Next, as shown in Fig. 4(c), the third intermediate 10c of the laminate 10 is produced. The third intermediate 10c may be produced by the single extrusion lamination method.

[0076] At this time, first, as the second intermediate layer 18b, for example, an opalescent polyethylene film is prepared.

[0077] Next, an anchor coat agent is applied onto the polyethylene terephthalate film as the first intermediate layer 18a of the second intermediate 10b, and then dried to form an anchor coat layer (the second anchor coat layer 15b). Next, for example, low-density polyethylene is extruded onto the anchor coat layer to form an extruded polyethylene layer (the third adhesive layer 14c). Also, at this time, through the extruded polyethylene layer (the third adhesive layer 14c), the opalescent polyethylene film as the second intermediate layer 18b is bonded together. In this way, the third intermediate 10c of the laminate 10 is obtained (see Fig. 4(c)).

[0078] Next, as shown in FIG. 4(d), a fourth intermediate 10d of the laminate 10 is produced. The fourth intermediate 10d may be produced by a tandem extrusion lamination method.

[0079] At this time, first, an anchor coat agent is applied onto a biaxially stretched polyethylene terephthalate film as the base material layer 13 of the third intermediate 10c, and then dried to form an anchor coat layer (first anchor coat layer 15a). Next, low density polyethylene is extruded onto the anchor coat layer to form an extruded polyethylene layer (first adhesive layer 14a). Also, at this time, low density polyethylene is extruded onto the extruded polyethylene layer (first adhesive layer 14a) to form a first sealant layer 11. In this way, the fourth intermediate 10d of the laminate 10 is obtained (see FIG. 4(d)).

[0080] Next, the laminate 10 is produced from the fourth intermediate 10d of the laminate 10. At this time, the laminate 10 may be produced by a tandem extrusion lamination method.

[0081] At this time, first, an aluminum foil is prepared as the barrier layer 17. Also, as the second sealant layer 12, for example, a polyethylene film is prepared.

[0082] Next, an anchor coat agent is applied onto a polyethylene terephthalate film as the second intermediate layer 18b of the fourth intermediate 10d, and then dried to form an anchor coat layer (third anchor coat layer 15c). Next, for example, an ethylene-methacrylic acid copolymer (EMAA) is extruded onto the anchor coat layer to form an extruded ethylene-methacrylic acid copolymer layer (extruded EMAA layer (fourth adhesive layer 14d)). Also, at this time, an aluminum foil as the barrier layer 17 is laminated via the extruded EMAA layer (fourth adhesive layer 14d).

[0083] Also, an anchor coat agent is applied onto the aluminum foil as the barrier layer 17 and then dried to form an anchor coat layer (the fourth anchor coat layer 15d). Next, for example, an ethylene-methacrylic acid copolymer (EMAA) is extruded from an extruder 85 (see FIG. 5) onto the anchor coat layer to form an extruded EMAA layer (the fifth adhesive layer 14e). At this time, a polyethylene film as the second sealant layer 12 is laminated via the extruded EMAA layer (the fifth adhesive layer 14e).

[0084] Here, as shown in FIG. 5, the fourth intermediate 10d, the aluminum foil as the barrier layer 17, and the polyethylene film as the second sealant layer 12, which are laminated together, are cooled by a cooling roll 86. The surface of this cooling roll 86 is provided with a concavo-convex structure corresponding to the concavo-convex structure provided on the inner surface 102 of the laminate 10. Then, when the fourth intermediate 10d, the aluminum foil as the barrier layer 17, and the polyethylene film as the second sealant layer 12 are cooled by the cooling roll 86, a concavo-convex structure including a plurality of concave portions 103 and a plurality of convex portions 104 is provided on the inner surface of the second sealant layer 12 (i.e., the inner surface 102 of the laminate 10).

[0085] Thereafter, for example, a varnish layer 19b is formed by performing a flexo-nis coating on the first sealant layer 11 using flexo-nis. In this way, the laminate 10 shown in FIG. 2A is obtained.

[0086] Next, a method for manufacturing the tube container 40 from the obtained laminate 10 will be described.

[0087] First, the laminate 10 is rolled up, and the opposing edge portions are joined together, for example, by heat sealing to form a cylindrical shape, thereby producing the body tube 41. At this time, first, as shown in FIGS. 6(a)-(b), the laminate 10 is wound around the outer surface of the cylindrical inner seal member 80, and the opposing edge portions of the laminate 10 are overlapped. At this time, the laminate 10 is wound around the inner seal member 80 such that the second sealant layer 12 of the laminate 10 faces the outer surface of the inner seal member 80. The inner seal member 80 can be made of metal, for example, stainless steel. Further, when the opposing edge portions of the laminate 10 are overlapped, the laminate 10 is conveyed downstream (the left side in FIGS. 6(a)-(b)) by a conveyance belt and guide rolls (not shown).

[0088] Next, as shown in FIG. 6(b), the outer seal member 81 is pressed against the portion where the opposing edge portions of the laminate 10 are overlapped, and the portion where the opposing edge portions of the laminate 10 are overlapped is sandwiched between the inner seal member 80 and the outer seal member 81. Then, the portion where the opposing edge portions of the laminate 10 are overlapped is joined by heat sealing.

[0089] Thereafter, the joined laminate 10 is cut for each individual body tube 41. In this way, as shown in FIG. 6(c), the body tube 41 is produced. At this time, the speed of producing the body tube 41 may be about 300 pieces / min.

[0090] Next, using the joined laminate 10 (body tube 41), the tube container 40 described above is manufactured by a compression molding method.

[0091] First, as shown in FIG. 7(a), this cylindrical laminate 10 (body tube 41) is wound around a mandrel 82, and a mold 83 for compression molding the head member 43 is attached to one end of the mandrel 82. That is, the laminate 10 (body tube 41) previously formed in a cylindrical shape is wound around the mandrel 82 whose tip serves as a core for compression molding the head member 43, and is advanced to a predetermined position within the cavity of the mold 83 for molding the head member 43.

[0092] Subsequently, the head member 43 is compression-molded by supplying molten resin from a resin supply device (not shown) into the mold 83. In this case, by inserting one end 42 of the body tube 41 into the mold 83, the head member 43 is molded, and at the same time, the body tube 41 is integrally fused to the head member 43. Then, the tube container 40 is obtained by taking out the integrated head member 43 and body tube 41 from the mold 83 and the mandrel 82 (see Fig. 7(b)).

[0093] Also, when manufacturing the capped tube container 40A, the cap 49 is prepared in parallel with manufacturing the tube container 40. In this case, for example, an injection molding machine (not shown) is used to produce the cap 49 by an injection molding method. Then, the capped tube container 40A shown in Fig. 1 is obtained by screwing the cap 49 onto the mouth of the head member 43 of the tube container 40.

[0094] Thereafter, the content is filled into the body tube 41 of the capped tube container 40A from the bottom side, and the bottom of the body tube 41 is sealed, whereby the capped tube container 40A containing the content as a product is obtained.

[0095] According to the present embodiment as described above, the laminate 10 includes a first sealant layer 11, a base material layer 13, a barrier layer 17, and a second sealant layer 12, which are arranged in order from the outer surface 101 toward the inner surface 102. Further, an uneven structure including a plurality of concave portions 103 and a plurality of convex portions 104 is provided on the inner surface 102. Also, the surface roughness Sa of the inner surface 102, measured in accordance with ISO 25178-2:2012, is 7 μm or more and 20 μm or less. Also, the arithmetic mean curvature Spc of the convex portion 104, measured in accordance with ISO 25178-2:2012, is 800 μm or more and 1500 μm or less. Further, the coefficient of kinetic friction of the inner surface 102 with respect to metal is 0.32 or more and 0.58 or less. Thus, in the present embodiment, the surface roughness Sa of the inner surface, measured in accordance with ISO 25178-2:2012, is 7 μm or more, the arithmetic mean curvature Spc of the convex portion 104, measured in accordance with ISO 25178-2:2012, is 800 μm or more, and the coefficient of kinetic friction of the inner surface 102 with respect to metal is 0.32 or more. Thereby, the laminate 10 can be easily wound around the inner seal member 80 described later. For this reason, the productivity of the body tube 41 can be improved. Note that the fact that such an effect can be obtained will be described in the examples described later.

[0096] Also, in the present embodiment, the surface roughness Sa of the inner surface, measured in accordance with ISO 25178-2:2012, is 20 μm or less, the arithmetic mean curvature Spc of the convex portion 104, measured in accordance with ISO 25178-2:2012, is 1500 μm or less, and the coefficient of kinetic friction of the inner surface 102 with respect to metal is 0.58 or less. Thereby, when the laminate 10 is wound around the inner seal member 80 described later, it is possible to suppress the occurrence of scratches on the second sealant layer 12. Also, since it is possible to suppress the occurrence of scratches on the second sealant layer 12, it is possible to suppress the adhesion of foreign substances (for example, precipitated pigments, etc.) due to the scratches on the second sealant layer 12 to the inner seal member 80 and the like described later. Note that the fact that such an effect can be obtained will be described in the examples described later.

[0097] Furthermore, according to this embodiment, the static friction coefficient of the inner surface 102 with respect to the metal is 0.35 or more. Thereby, even when the conveyance of the laminate 10 stops when manufacturing the body tube 41, when the conveyance of the laminate 10 is restarted, the laminate 10 can be easily wound around the inner seal member 80 described later. For this reason, the productivity of the body tube 41 can be improved. Also, since the static friction coefficient of the inner surface 102 with respect to the metal is 0.60 or less, even when the conveyance of the laminate 10 stops when manufacturing the body tube 41, it is possible to suppress the occurrence of scratches on the second sealant layer 12. The fact that such an effect can be obtained will be described in the examples described later.

[0098] Also, in this embodiment, in the laminate 10, the barrier layer 17 includes an aluminum foil. Thus, by using an aluminum foil as the barrier layer 17, it becomes easy to manufacture the laminate 10 having barrier properties.

[0099] Also, according to this embodiment, the first sealant layer 11 and the second sealant layer 12 each contain polyethylene. Thereby, when joining the first sealant layer 11 and the second sealant layer 12 to each other, the joinability between the first sealant layer 11 and the second sealant layer 12 can be improved.

Examples

[0100] Next, specific examples in the above embodiment will be described.

[0101] (Example 1) The laminate 10 shown in FIG. 2A was manufactured. At this time, first, the first intermediate body 10a of the laminate 10 was manufactured. When manufacturing the first intermediate body 10a, first, as the base material layer 13, a biaxially stretched polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., E5200 (trade name), thickness 12 μm) was prepared.

[0102] Next, a urethane-based gravure ink (manufactured by Toyo Ink Co., Ltd., NEW-LP Super (trade name)) was applied onto a biaxially stretched polyethylene terephthalate film as the base material layer 13 by gravure printing, and then the ink was dried to form a printing layer 16 (thickness: 1 μm). In this way, the first intermediate 10a of the laminate 10 was produced. The layer structure of the obtained first intermediate 10a is as follows. PET / Print In the above, "PET" means a biaxially stretched polyethylene terephthalate film (the same applies hereinafter). Also, "Print" means a printing layer (the same applies hereinafter).

[0103] Next, the second intermediate 10b of the laminate 10 was produced. The second intermediate 10b was produced by the dry lamination method.

[0104] At this time, first, as the first intermediate layer 18a, a biaxially stretched polyethylene terephthalate film (manufactured by Toray Film Processing Co., Ltd., VM-PET, 1310 (trade name), thickness: 12 μm) provided with a vapor deposition layer 19a was prepared.

[0105] Next, an adhesive (manufactured by Mitsui Takeda Chemical Co., Ltd., XA-311 / A-3 (trade name)) was applied onto the vapor deposition layer 19a to form an adhesive layer (the second adhesive layer 14b). Further, through this adhesive layer, the first intermediate layer 18a and the first intermediate 10a were laminated. In this way, the second intermediate 10b of the laminate 10 was produced. The layer structure of the obtained second intermediate 10b is as follows. PET / Print / DL / Vapor deposition layer / PET In the above, "DL" means an adhesive layer. (The same applies hereinafter).

[0106] Next, the third intermediate 10c of the laminate 10 was produced. The third intermediate 10c was produced by the single extrusion lamination method.

[0107] At this time, first, as the second intermediate layer 18b, an opaque polyethylene film (manufactured by Tamapoli Co., Ltd., HD Shiro (trade name), thickness: 80 μm) was prepared.

[0108] Next, an anchor coat agent was applied onto a polyethylene terephthalate film as the first intermediate layer 18a of the second intermediate 10b, and then dried to form an anchor coat layer (the second anchor coat layer 15b). Next, low-density polyethylene (CE4009 (trade name)) was extruded onto the anchor coat layer to form an extruded polyethylene layer with a thickness of 20 μm (the third adhesive layer 14c). At this time, an opalescent polyethylene film as the second intermediate layer 18b was laminated via the extruded polyethylene layer (the third adhesive layer 14c). In this way, the third intermediate 10c of the laminate 10 was produced. The layer structure of the obtained third intermediate 10c is as follows. PET / Print / DL / Vapor deposition layer / PET / AC / PE (adhesive) / Opalescent PEF In the above, "AC" means an anchor coat layer (the same applies hereinafter). "PE (adhesive)" means an extruded polyethylene layer as an adhesive layer (the same applies hereinafter). Further, "opalescent PEF" means an opalescent polyethylene film (the same applies hereinafter).

[0109] Next, the fourth intermediate 10d of the laminate 10 was produced. The fourth intermediate 10d was produced by the tandem extrusion lamination method.

[0110] At this time, first, an anchor coat agent was applied onto a biaxially stretched polyethylene terephthalate film as the base material layer 13 of the third intermediate 10c, and then dried to form an anchor coat layer (the first anchor coat layer 15a). Next, low-density polyethylene (CE4009 (trade name)) was extruded onto the anchor coat layer to form an extruded polyethylene layer with a thickness of 20 μm (the first adhesive layer 14a). At this time, low-density polyethylene (manufactured by Japan Polyethylene Corporation, Novatec LD LC602A (trade name), thickness 30 μm) was extruded onto the extruded polyethylene layer (the first adhesive layer 14a) to form the first sealant layer 11. In this way, the fourth intermediate 10d of the laminate 10 was produced. The layer structure of the obtained fourth intermediate 10d is as follows. PE / PE(adhesion) / AC / PET / printing / DL / vapor deposition layer / PET / AC / PE(adhesion) / opaque PEF In the above, "PE" means an extruded polyethylene layer (the same applies hereinafter).

[0111] Next, the laminate 10 was produced using the fourth intermediate 10d. The laminate 10 was produced by the tandem extrusion lamination method.

[0112] At this time, first, as the barrier layer 17, an aluminum foil (manufactured by Toyo Aluminum Co., Ltd., TOUYOU (trade name), thickness 10 μm) was prepared. Also, as the second sealant layer 12, a polyethylene film (manufactured by Icello Co., Ltd., L100N (trade name), 50 μm) was prepared.

[0113] Next, an anchor coat agent was applied onto the polyethylene terephthalate film as the second intermediate layer 18b of the fourth intermediate 10d, and then dried to form an anchor coat layer (the third anchor coat layer 15c). Next, an ethylene-methacrylic acid copolymer (EMAA) (manufactured by Mitsui Dow Chemical Co., Ltd., Nuclel N0908C (trade name)) was extruded onto the anchor coat layer to form an extruded ethylene-methacrylic acid copolymer layer with a thickness of 20 μm (the extruded EMAA layer (the fourth adhesive layer 14d)). Also, at this time, an aluminum foil as the barrier layer 17 was laminated via the extruded EMAA layer (the fourth adhesive layer 14d).

[0114] Further, an anchor coat agent was applied onto the aluminum foil as the barrier layer 17 and then dried to form an anchor coat layer (the fourth anchor coat layer 15d). Next, an ethylene-methacrylic acid copolymer (EMAA) (manufactured by Mitsui Dow Chemical Co., Ltd., Nuclel N0908C (trade name)) was extruded onto the anchor coat layer to form an extruded EMAA layer with a thickness of 35 μm (the fifth adhesive layer 14e). At this time, a polyethylene film as the second sealant layer 12 was laminated via the extruded EMAA layer (the fifth adhesive layer 14e). Then, the fourth intermediate 10d, the aluminum foil as the barrier layer 17, and the polyethylene film as the second sealant layer 12 were cooled by a cooling roll 86. At this time, a cooling roll having an uneven structure on its surface was used as the cooling roll 86.

[0115] Thereafter, a flexographic coating was applied onto the first sealant layer 11 using Flexonis (manufactured by Toyo Ink Co., Ltd., FDFL AQF4 varnish (trade name)). In this way, a plurality of laminates 10 were produced. The layer configuration of the obtained laminate 10 is as follows. Varnish / PE / PE (adhesive) / AC / PET / Print / DL / Vapor deposition layer / PET / AC / PE (adhesive) / Opalescent PEF / AC / EMAA (adhesive) / ALM / AC / EMAA (adhesive) / PEF In the above, "EMAA (adhesive)" means an extruded ethylene-methacrylic acid copolymer layer as an adhesive layer (the same applies hereinafter). Further, "PEF" means a polyethylene film (the same applies hereinafter).

[0116] Also, using the three obtained laminates 10, the tube container 40 shown in FIG. 1 was produced. In this case, first, the laminate 10 was formed into a cylindrical shape to produce a body tube 41. At this time, the laminate 10 was joined by heat sealing with an inner seal member 80 and an outer seal member 81, and then cut for each individual body tube 41. The production speed of the body tube 41 was set to 300 pieces / min, and a total of 750 body tubes 41, 250 pieces for each sample, were produced.

[0117] After that, each of these body tubes 41 was wound around a mandrel 82, and the head member 43 was integrally formed with the body tube 41 by a compression molding method to obtain a tube container 40. As the material of the head member 43, high-density polyethylene (HDPE) was used.

[0118] In this way, a total of 750 tube containers 40 were produced.

[0119] (Example 2) The laminate 10 shown in FIG. 2B was produced. At this time, first, a first intermediate body of the laminate 10 was produced. When producing the first intermediate body, first, as the base material layer 13, a biaxially stretched polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., E5200 (trade name), thickness 12 μm) was prepared.

[0120] Next, a urethane-based gravure ink (manufactured by Toyo Ink Co., Ltd., NEW-LP Super (trade name)) was applied by gravure printing onto the biaxially stretched polyethylene terephthalate film as the base material layer 13, and then the ink was dried to form a printed layer 16 (thickness 1 μm). In this way, the first intermediate body of the laminate 10 was produced. The layer configuration of the obtained first intermediate body is as follows. PET / Print

[0121] Next, a second intermediate body of the laminate 10 was produced. The second intermediate body was produced by a single extrusion lamination method.

[0122] At this time, first, as the intermediate layer 18, an opalescent polyethylene film (manufactured by Tamapoli Co., Ltd., HD Shiro (trade name), thickness 60 μm) was prepared.

[0123] Next, an anchor coat agent was applied onto the printing layer 16 of the first intermediate, and then dried to form an anchor coat layer (the second anchor coat layer 15b). Next, low-density polyethylene (CE4009 (trade name)) was extruded onto the anchor coat layer to form an extruded polyethylene layer (the second adhesive layer 14b) with a thickness of 20 μm. Also, at this time, an opalescent polyethylene film as the intermediate layer 18 was laminated via the extruded polyethylene layer (the second adhesive layer 14b). In this way, the second intermediate of the laminate 10 was produced. The layer configuration of the obtained second intermediate is as follows. PET / Print / AC / PE (Adhesive) / Opalescent HDPEF

[0124] Next, the third intermediate of the laminate 10 was produced. The third intermediate was produced by the tandem extrusion lamination method.

[0125] At this time, first, an anchor coat agent was applied onto the biaxially stretched polyethylene terephthalate film as the base material layer 13 of the second intermediate, and then dried to form an anchor coat layer (the first anchor coat layer 15a). Next, low-density polyethylene (CE4009 (trade name)) was extruded onto the anchor coat layer to form an extruded polyethylene layer (the first adhesive layer 14a) with a thickness of 20 μm. Also, at this time, low-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., Novatec LD LC602A (trade name), thickness 35 μm) was extruded onto the extruded polyethylene layer (the first adhesive layer 14a) to form the first sealant layer 11. In this way, the third intermediate of the laminate 10 was produced. The layer configuration of the obtained third intermediate is as follows. PE / PE (Adhesive) / AC / PET / Print / AC / PE (Adhesive) / Opalescent PEF

[0126] Next, the laminate 10 was produced using the third intermediate. The laminate 10 was produced by the tandem extrusion lamination method.

[0127] At this time, first, as the barrier layer 17, an aluminum foil (manufactured by Toyo Aluminum Co., Ltd., TOUYOU (trade name), thickness 10 μm) was prepared. Also, as the second sealant layer 12, a polyethylene film (manufactured by ISELO Co., Ltd., L100N (trade name), 50 μm) was prepared.

[0128] Next, an anchor coating agent was applied onto a polyethylene terephthalate film as the intermediate layer 18 of the third intermediate body, and then dried to form an anchor coating layer (the third anchor coating layer 15c). Next, an ethylene-methacrylic acid copolymer (EMAA) (manufactured by Mitsui Dow Chemical Co., Ltd., Nuclel N0908C (trade name)) was extruded onto the anchor coating layer to form an extruded ethylene-methacrylic acid copolymer layer with a thickness of 20 μm (the extruded EMAA layer (the third adhesive layer 14c)). Also, at this time, an aluminum foil as the barrier layer 17 was bonded via the extruded EMAA layer (the third adhesive layer 14c).

[0129] Also, an ethylene-methacrylic acid copolymer (EMAA) (manufactured by Mitsui Dow Chemical Co., Ltd., Nuclel N0908C (trade name)) was extruded onto the aluminum foil as the barrier layer 17 to form an extruded EMAA layer with a thickness of 30 μm (the fourth adhesive layer 14d). Also, at this time, a polyethylene film as the second sealant layer 12 was bonded via the extruded EMAA layer (the fourth adhesive layer 14d). Then, the third intermediate body, the aluminum foil as the barrier layer 17, and the polyethylene film as the second sealant layer 12 were cooled by a cooling roll 86. At this time, as the cooling roll 86, a cooling roll having an uneven structure on its surface was used. In this way, a plurality of laminates 10 were produced. The layer structure of the obtained laminate is as follows. PE / PE(adhesion) / AC / PET / print / AC / PE(adhesion) / milky white PEF / AC / EMAA(adhesion) / ALM / EMAA(adhesion) / PEF

[0130] Also, using the three obtained laminates 10, a tube container 40 shown in FIG. 1 was fabricated. In this case, first, the laminate 10 was formed into a cylindrical shape to fabricate a body tube 41. At this time, after joining the laminate 10 by high-frequency and heat sealing with an inner seal member 80 and an outer seal member 81, it was cut for each individual body tube 41. The production speed of the body tube 41 was set to 300 pieces / min, and a total of 750 body tubes 41, 250 pieces for each sample, were fabricated.

[0131] Thereafter, these body tubes 41 were each wound around a mandrel 82, and a head member 43 was integrally formed with the body tube 41 by a compression molding method to obtain a tube container 40. As the material of the head member 43, high-density polyethylene (HDPE) was used.

[0132] In this way, a total of 750 tube containers 40 were fabricated.

[0133] (Comparative Example 1) A laminate and a tube container were fabricated in the same manner as in Example 1, except that a cooling roll without an uneven structure on its surface was used.

[0134] (Comparative Example 2) A laminate and a tube container were fabricated in the same manner as in Example 2, except that a cooling roll without an uneven structure on its surface was used.

[0135] (Surface roughness Sa measurement test · Arithmetic mean curvature Spc measurement test) The surface roughness Sa and the arithmetic mean curvature Spc of the laminates according to Example 1 to Comparative Example 2 were measured. The surface roughness Sa and the arithmetic mean curvature Spc were measured by a method compliant with ISO 25178-2:2012. At this time, the surface roughness Sa and the arithmetic mean curvature Spc were measured within a region of 1000 μm × 1000 μm on the inner surface of the laminate. Also, the measurement was performed using a shape analysis laser microscope (Keyence Corporation VK-8710). At this time, three test pieces were prepared, and for each test piece, the surface roughness Sa and the arithmetic mean curvature Spc were measured. Then, for each of the surface roughness Sa and the arithmetic mean curvature Spc, the average value of the values of the three test pieces was taken as the surface roughness Sa or the arithmetic mean curvature Spc of the laminate.

[0136] <Static friction coefficient measurement test · Kinetic friction coefficient measurement test> The static friction coefficient and kinetic friction coefficient of the inner surface of the laminate according to Example 1 to Comparative Example 2 were measured respectively. The static friction coefficient and kinetic friction coefficient were measured in accordance with 8.2 "Measurement of Films When Contacting Metals or Other Materials" of JIS K 7125: 1999. At this time, first, the measuring device and the laminate 10 were stabilized in an environment of 26 °C from each laminate. Also, the laminate 10 was cut out into test pieces of 80 mm × 200 mm using a specified mold. Also, a mating material that contacts the cut test piece was prepared. As the mating material, a member made of SUS304 was used. Next, the test piece was overlapped with the mating material so that the second sealant layer 12 faced the mating material, and a sliding piece was placed thereon. The weight of the sliding piece was 200 g. Then, the test piece and the sliding piece were brought into close contact so as not to slide, and the sliding piece was pulled at a speed of 100 mm / min. Then, the static frictional force (N) and kinetic frictional force (N) between the test piece and the mating material were measured, and the static friction coefficient and kinetic friction coefficient were calculated by dividing the static frictional force and kinetic frictional force by the normal force (1.96 N) of the sliding piece. The kinetic friction coefficient was obtained from the average value up to the first 30 mm after the relative displacement motion between the test piece and the mating material started, ignoring the peak of the static frictional force. The load cell was directly connected to the sliding piece. At this time, three test pieces were prepared, and the static friction coefficient and kinetic friction coefficient were measured for each test piece. Then, for each of the surface static friction coefficient and kinetic friction coefficient, the average value of the values of the three test pieces was taken as the static friction coefficient or kinetic friction coefficient of the laminate.

[0137] <Adhesion Evaluation and Scratch Resistance Evaluation> Also, test pieces were obtained by cutting the body seal portion of the tube container in a strip shape with a width of 15 mm so that the longitudinal direction was perpendicular to the longitudinal direction of the body seal portion of the tube container. This test piece was pulled at a test speed of 300 mm / min with a tensile testing machine (manufactured by Orientec, STA-1150). At this time, three test pieces were prepared, and tests were performed for each test piece.

[0138] <Scratch Resistance Evaluation> Next, the number of scratches generated on the inner surface of the tube of the body of the tube container was confirmed. At this time, three tube containers were prepared, and the number of scratches was confirmed for each tube container.

[0139] The above results are shown in Tables 1 and 2.

[0140]

Table 1

[0141]

Table 2

[0142] In Table 2 above, "good" in the "Bonding property" column means that no appearance defects such as peeling between laminates occurred in all the body seal parts of the three test pieces.

[0143] Also, in Table 2 above, "good" in the "Scratch resistance" column means that the average number of scratches generated on the inner surface of the body tube is less than 20, and no resin chips (powder) are generated. Also, "bad" in the "Scratch resistance" column means that the average number of scratches generated on the inner surface of the body tube is 20 or more, and resin chips (powder) are generated.

[0144] Also, in Table 2 above, "good" in the "Wrinkle" column means that no wrinkles occurred on the outer surface of the body tube. Also, "bad" in the "Wrinkle" column means that wrinkles occurred on the outer surface of the body tube.

[0145] Also, in Table 2 above, "good" in the "Slip" column means that no slippage of the laminate against the conveyor belt occurred when manufacturing the body tube. Also, "bad" in the "Wrinkle" column means that slippage of the laminate against the conveyor belt occurred when manufacturing the head tube.

[0146] As a result, in the tube containers of Comparative Example 1 and Comparative Example 2, as shown in Table 1, the static friction coefficient of the inner surface of the laminate was 0.31 and the kinetic friction coefficient was 0.29. And, in the tube containers of Comparative Example 1 and Comparative Example 2, as shown in Table 2, on average, 20 or more scratches and resin chips were generated on the inner surface of the body tube. Also, in the tube containers of Comparative Example 1 and Comparative Example 2, wrinkles occurred on the outer surface of the body tube, and slippage of the laminate with respect to the conveyor belt occurred. On the other hand, in the tube containers 40 according to Example 1 and Example 2, as shown in Table 1, the static friction coefficient of the inner surface 102 of the laminate 10 was 0.42 and the kinetic friction coefficient was 0.39. And, in the tube containers 40 according to Example 1 and Example 2, as shown in Table 2, the average number of scratches generated on the inner surface 102 of the body tube 41 was less than 20, and resin chips were not generated. Also, in the tube containers of Example 1 and Example 2, wrinkles did not occur on the outer surface of the body tube, and slippage of the laminate with respect to the conveyor belt did not occur.

[0147] Thus, the tube containers 40 according to Example 1 and Example 2 were able to suppress the occurrence of scratches (abrasions) on the inner surface 102 of the body tube 41 by setting the static friction coefficient and the kinetic friction coefficient of the inner surface 102 of the laminate 10 within a predetermined range. For this reason, it was possible to suppress the adhesion of foreign matter caused by scratches generated on the second sealant layer 12 to the inner seal member 80, and it was possible to suppress the deterioration of the bonding property between the first sealant layer 11 and the second sealant layer 12. Also, the tube containers 40 according to Example 1 and Example 2 were able to suppress the occurrence of wrinkles on the outer surface of the body tube and the slippage of the laminate with respect to the conveyor belt.

[0148] Also, even when the slipperiness of the laminate 10 with respect to the inner seal member 80 of the tube containers 40 according to Example 1 and Example 2 was improved, as shown in Table 2, the bonding property between the first sealant layer 11 and the second sealant layer 12 could be kept good.

[0149] It is also possible to appropriately combine a plurality of components disclosed in the above embodiments as needed. Alternatively, some components may be deleted from all the components shown in the above embodiments.

Explanation of Reference Numerals

[0150] 10 laminate 11 first sealant layer 12 second sealant layer 13 base material layer 17 barrier layer 40 tube container 40A tube container with a cap 41 body tube 42 one end 43 head member 49 cap 101 outer surface 102 inner surface 103 recess 104 protrusion

Claims

1. A laminate comprising a first sealant layer, a base material layer, a barrier layer, and a second sealant layer, which are arranged in order from the outer surface toward the inner surface, wherein the inner surface is provided with an uneven structure including a plurality of concave portions and a plurality of convex portions, the surface roughness Sa of the inner surface, measured in accordance with ISO 25178-2:2012, is 7 μm or more and 20 μm or less, the arithmetic mean curvature Spc of the convex portions, measured in accordance with ISO 25178-2:2012, is 800 μm or more and 1500 μm or less, the static friction coefficient of the inner surface with respect to metal is 0.35 or more and 0.60 or less, the kinetic friction coefficient of the inner surface with respect to metal is 0.32 or more and 0.58 or less, and the barrier layer includes an aluminum foil.

2. The laminate according to claim 1, wherein the first sealant layer and the second sealant layer each contain polyethylene.

3. The laminate according to claim 1, wherein the base material layer contains polyethylene or polyethylene terephthalate.

4. In a tube container, a body tube in which opposing edge portions of the laminate according to any one of claims 1 to 3 are overlapped and joined to each other, and a head member joined to one end of the body tube.

5. In a tube container with a cap, the tube container according to claim 4, and a cap attached to the head member.

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