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 constituting an outer surface 101, a second sealant layer 12 constituting an inner surface 102 and a base material layer 13 provided between the first sealant layer 11 and the second sealant layer 12. 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 3 μm or more and 12 μm or less and the arithmetic mean curvature Spc of the convex portions 104 is 350 μm or more and 700 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 0.35 or more and 0.75 or less and the coefficient of dynamic friction is 0.32 or more and 0.70 or less. 90% or more of the laminate 10 is made of the same resin-based material.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 cylinder and a process of forming a head member on the body tube.

[0003] Among these, in the process of forming a body tube made of a laminate layer into a cylinder, the laminate is rolled up, and the resin layer (sealant layer) surfaces of the outermost layers at both edge portions of the laminate and the resin layer (sealant layer) surfaces of the innermost layers 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 when forming the body tube, scratches may occur on the resin layer surface, which is the innermost layer. When scratches occur on the resin layer surface, which is the innermost layer, there are problems such as foreign matter (for example, precipitated pigments) caused by the scratches adhering to the seal member, resulting in a decrease in the bonding property of the laminate. In addition, when foreign matter adheres to the production line, the production line may become dirty. Furthermore, when the slipperiness of the resin layer surface, which is the innermost layer, is insufficient, due to a decrease in the transportability of the laminate, there is a possibility that the processing timing of the molding member and the movement timing of the laminate may be misaligned. Thus, when the processing timing of the molding 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 constituting an outer surface; a second sealant layer constituting an inner surface; a base material layer provided between the first sealant layer and the second sealant layer, 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 3 μm or more and 12 μm or less, the arithmetic mean curvature Spc of the convex portions, measured in accordance with ISO 25178-2:2012, is 350 μm or more and 700 μm or less The coefficient of static friction of the inner surface with respect to the metal is 0.35 or more and 0.75 or less, The coefficient of kinetic friction of the inner surface with respect to the metal is 0.32 or more and 0.70 or less, At least 90% or more is a laminate made of materials of the same resin system.

[0009] [2] The laminate according to [1], wherein the material of the same resin system is a polyethylene-based resin.

[0010] [3] The laminate according to [1] or [2], wherein the first sealant layer and the second sealant layer are made of a polyethylene-based resin.

[0011] [4] In a tube container, A body tube in which the opposing edge portions of the laminate according to any one of [1] to [3] are overlapped and joined to each other, and A head member joined to one end of the body tube, a tube container comprising.

[0012] [5] In a tube container with a cap, The tube container according to [4], and A cap attached to the head member, a tube container with a cap comprising.

Effect 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

[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. Also, it can be implemented with appropriate changes 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 (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 (that is, the outer surface 101 of the laminate 10 described later) faces the side opposite to the content side, and the inner surface (that is, 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. The 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 up 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] Also, the body tube 41 has a bottom seal portion 45 where the packaging materials for tube containers are joined to each other. The bottom seal portion 45 is a portion where the packaging materials for tube containers near 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 that constitutes the body tube 41. As shown in FIGS. 2A and 2B, the laminate 10 includes a first sealant layer 11 that constitutes the outer surface 101, a second sealant layer 12 that constitutes the inner surface 102, and a base material layer 13 provided between the first sealant layer 11 and the second sealant layer 12.

[0022] Specifically, as shown in FIG. 2A, the laminate 10 includes, in this order, a first sealant layer 11, a first adhesive layer 14a, an anchor coat layer 15, a printing layer 16, a base material layer 13, a second adhesive layer 14b, a barrier layer 17, a third adhesive layer 14c, and a second sealant layer 12.

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

[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 with a density of 910 kg / m 3 or more and 930 kg / m 3 or less. Medium-density polyethylene is polyethylene with a density of 930 kg / m 3 or more and 942 kg / m 3 or less. Furthermore, high-density polyethylene is polyethylene with 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 or low pressure, when 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 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 ), etc. 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, Ultzex (registered trademark), 2021I (product name) manufactured by Prime Polymer Co., Ltd., Ultzex (registered trademark), 3520L (product name) manufactured by Prime Polymer Co., Ltd., Kernel (registered trademark), KMB-16F (product name) manufactured by Nippon Polyethylene Co., Ltd. can be used.

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

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

[0031] Also, in the present 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 and the intermediate layer 18 are, for example, layers for supporting the first sealant layer 11 and the second sealant layer 12 and enhancing the strength of the entire laminate 10, and for forming the printing layer 16 and the barrier layer 17. As the materials constituting the base material layer 13 and the intermediate layer 18, for example, polyester-based resins, polyamide-based resins, polyaramid-based resins, polyolefin-based resins, polycarbonate-based resins, polyacetal-based resins, fluorine-based resins, films or sheets of other tough resins, etc. can be used. As an example, the base material layer 13 and the intermediate layer 18 may not contain polyethylene terephthalate or aluminum foil. Also, the base material layer 13 and the intermediate layer 18 may contain polyethylene terephthalate. As the polyolefin-based resin, for example, films of extruded low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene can be used.

[0033] 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 uniaxially stretched polyethylene-based resin film is preferable because it is environmentally friendly in terms of being able to be made into a single material and is excellent in terms of printing suitability.

[0034] In the present embodiment, the thicknesses of the base material layer 13 and the intermediate layer 18 are preferably 10 μm or more and 35 μm or less, respectively.

[0035] 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.

[0036] 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. In addition, 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.

[0037] In the present embodiment, the surface roughness Sa of the inner surface 102 measured in accordance with ISO 25178-2:2012 is 3 μm or more and 12 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 the reference plane (average plane) S (see FIG. 3).

[0038] In addition, the arithmetic mean curvature Spc of the convex portion 104, which is measured in accordance with ISO 25178-2:2012, is 350 μm or more and 700 μm or less. Note that the arithmetic mean curvature Spc of the inner surface 102 refers to the average of the curvatures at the top of the convex portion 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.

[0039] (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 compliant with 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. Also, 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.

[0040] In addition, in this embodiment, the static friction coefficient of the inner surface 102 with respect to the metal is 0.35 or more and 0.75 or less.

[0041] Also, the kinetic friction coefficient of the inner surface 102 with respect to the metal is 0.32 or more and 0.70 or less.

[0042] Note that the static friction coefficient and the kinetic friction coefficient 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 kinetic friction coefficient 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.

[0043] (Static friction coefficient measurement test · Kinetic friction coefficient measurement test) The static friction coefficient and the kinetic friction coefficient are measured by a method compliant with 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 10 are stabilized in an environment of 26°C. Also, the laminate 10 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, with the second sealant layer 12 facing the mating material, the test piece is placed on 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 that they do not 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 movement 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.

[0044] As described above, in this embodiment, the surface roughness Sa of the inner surface measured in accordance with ISO 25178-2:2012 is 3 μm or more, the arithmetic mean curvature Spc of the convex portion 104 measured in accordance with ISO 25178-2:2012 is 350 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.

[0045] In addition, in the present embodiment, the surface roughness Sa of the inner surface measured in accordance with ISO 25178-2:2012 is 12 μm or less, the arithmetic mean curvature Spc of the convex portion 104 measured in accordance with ISO 25178-2:2012 is 700 μm or less, and the coefficient of kinetic friction of the inner surface 102 with respect to the metal is 0.70 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 substances (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.

[0046] 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. For this reason, 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 0.75 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.

[0047] In the present embodiment, the thickness of the second sealant layer 12 is preferably 50 μm or more and 250 μm or less.

[0048] Adhesive layer Adhesive layers such as the first adhesive layer 14a, the second adhesive layer 14b, the third adhesive layer 14c, and the fourth adhesive layer 14d are layers for adhering the first sealant layer 11, the base material layer 13, the intermediate layer 18, 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.

[0049] 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.

[0050] 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.

[0051] In this embodiment, the thickness of the adhesive layer is preferably 3 μm or more and 60 μm or less.

[0052] Also, as a method of laminating the first sealant layer 11, the base material layer 13, the intermediate layer 18, 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 arbitrary method. Further, when performing the above-described lamination, if necessary, pretreatment such as corona treatment and ozone treatment can be applied to the film.

[0053] Anchor coat layer The anchor coat layer 15 is a layer for enhancing the adhesion between layers. This anchor coat layer is formed by applying an anchor coat agent and drying it. As the anchor coat agent, any resin with a heat resistance temperature of 135°C or higher can be used, such as an anchor coat agent composed of 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 can be used in combination as an additive, and nitrocellulose can also be used in combination to enhance heat resistance. The dried anchor coat layer 15 is preferably 0.3 μm or more and 10 μm or less.

[0054] 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 designability of the laminate 10. As the printing layer 16, one or two or more kinds of ordinary ink vehicles are used as the main components. If necessary, one or two or more kinds of plasticizers, stabilizers, antioxidants, light stabilizers, ultraviolet absorbers, curing agents, crosslinking agents, lubricants, antistatic agents, fillers, and other additives can be optionally added. Further, colorants such as dyes and pigments are 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, one or two or more kinds of 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 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. The printing method may be, in addition to gravure printing, letterpress printing, screen printing, transfer printing, flexographic printing, or other printing methods.

[0055] Barrier layer The barrier layer 17 is a layer for suppressing 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. Specifically, as the barrier layer 17, for example, a resin film containing ethylene-vinyl alcohol copolymer (EVOH) can be used.

[0056] Other layers As other layers, for example, a concealment layer may be provided. The concealment layer is a layer for preventing the color change or variation of the intermediate layer 18, etc. from affecting the color of the pattern, etc. of the printing layer 16. An olefin resin can be used for the concealment layer. More specifically, as the concealment layer, a polyethylene film such as low-density polyethylene, linear low-density polyethylene, or medium-density polyethylene is preferably used. These polyethylene films may be colored, for example, like an opaque white polyethylene film. The thickness of the concealment layer is preferably, for example, 50 μm or more and 200 μm.

[0057] In such a laminate 10, at least 90% or more is a material of the same resin system. In this case, the laminate 10 can be classified as a so-called monomaterial and can be suitably used for producing a tube container (so-called monomaterial packaging container) composed of the same material. Here, for example, as polyethylene, high-density polyethylene, linear low-density polyethylene, etc. are exemplified. These high-density polyethylene, linear low-density polyethylene, etc. are classified as the "materials of the same resin system" in this specification. On the other hand, for example, polyethylene and polyester are not classified as materials of the same resin system.

[0058] 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, the present invention is not limited to this, and the joining of the body tube 41 and the head member 43 may be performed by an injection molding method.

[0059] Next, with reference to FIGS. 4(a)-(c) and FIG. 5, the manufacturing method of the laminate 10 will be described, and with reference to FIGS. 6(a)-(c) and FIGS. 7(a)-(b), the manufacturing method of the tube container 40 will be described.

[0060] First, with reference to FIGS. 4(a)-(c) and FIG. 5, the manufacturing method of the laminate 10 will be described.

[0061] In this case, first, as shown in FIG. 4(a), a first intermediate body 10a of the laminate 10 is produced.

[0062] When producing the first intermediate body 10a, first, as the base material layer 13, for example, a uniaxially stretched HDPE film is prepared.

[0063] Next, for example, urethane-based gravure ink is applied onto the uniaxially stretched HDPE 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 body 10a of the laminate 10 is obtained (see FIG. 4(a)).

[0064] Also, as shown in FIG. 4(b), a second intermediate body 10b of the laminate 10 is produced. The second intermediate body 10b may be produced by a single extrusion lamination method.

[0065] At this time, first, as the barrier layer 17, for example, a polyethylene resin film (EVOH-based barrier film) containing ethylene-vinyl alcohol copolymer (EVOH) is prepared. Also, as the second sealant layer 12, for example, an opaque polyethylene film is prepared.

[0066] Next, on the resin film as the barrier layer 17, for example, low-density polyethylene is melt-extruded from an extruder 85 (see FIG. 5) to form an extruded polyethylene layer (the third adhesive layer 14c). At this time, an opalescent polyethylene film as the second sealant layer 12 is bonded via the extruded polyethylene layer (the third adhesive layer 14c). In this way, the second intermediate 10b of the laminate 10 is obtained (see FIG. 4(b)).

[0067] Here, as shown in FIG. 5, the second intermediate 10b is cooled by a cooling roll 86. The surface of this cooling roll 86 is provided with an uneven structure corresponding to the uneven structure provided on the inner surface 102 of the laminate 10. When the second intermediate 10b is cooled by the cooling roll 86, an uneven 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 (that is, the inner surface 102 of the laminate 10).

[0068] Next, as shown in FIG. 4(c), the laminate 10 is manufactured. The laminate 10 is manufactured using the first intermediate 10a and the second intermediate 10b. At this time, the laminate 10 may be manufactured by a tandem extrusion lamination method.

[0069] At this time, first, the above-described first intermediate 10a and the above-described second intermediate 10b are prepared. Also, as the first sealant layer 11, for example, a polyethylene film containing an antistatic agent is prepared.

[0070] Next, on the resin film as the barrier layer 17 of the second intermediate 10b, for example, low-density polyethylene is melt-extruded from an extruder (not shown) to form an extruded polyethylene layer (the second adhesive layer 14b). At this time, the first intermediate 10a is bonded via the extruded polyethylene layer (the second adhesive layer 14b).

[0071] Next, an anchor coat agent is applied onto the printing layer 16 of the first intermediate 10a and then dried to form an anchor coat layer 15.

[0072] Next, for example, low-density polyethylene is melt-extruded onto the anchor coat layer 15 to form an extruded polyethylene layer (first adhesive layer 14a), and a polyethylene film as the first sealant layer 11 is laminated through this extruded polyethylene layer. In this way, as shown in FIG. 4(c), the laminate 10 is obtained.

[0073] Next, a method for manufacturing the tube container 40 from the obtained laminate 10 will be described.

[0074] First, the laminate 10 is rolled up, and the opposing edge portions are joined together, for example, by heat sealing to form a cylindrical tube, 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 so that the second sealant layer 12 of the laminate 10 faces the outer surface of the inner seal member 80. Note that the inner seal member 80 can be made of metal, for example, stainless steel. Also, 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).

[0075] 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. Next, the portion where the opposing edge portions of the laminate 10 are overlapped is joined by heat sealing or high-frequency output.

[0076] 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 production speed of the body tube 41 may be about 300 pieces / min.

[0077] Next, using the joined laminate 10 (body tube 41), the tube container 40 described above is manufactured by a compression molding method.

[0078] 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 of the head member 43 is attached to one end of the mandrel 82. That is, the laminate 10 (body tube 41) previously formed into 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 forming the head member 43.

[0079] Subsequently, by supplying molten resin from a resin supply device (not shown) into the mold 83, the head member 43 is compression molded. In this case, by inserting one end 42 of the body tube 41 into the mold 83, the head member 43 is formed, and at the same time, the body tube 41 is integrally fused to the head member 43. Then, by taking out the integrated head member 43 and body tube 41 from the mold 83 and the mandrel 82, the tube container 40 is obtained (see Fig. 7(b)).

[0080] Also, when manufacturing the capped tube container 40A, in parallel with manufacturing the tube container 40, a cap 49 is prepared. In this case, for example, using an injection molding machine (not shown), the cap 49 is manufactured by an injection molding method. Then, by screwing the cap 49 onto the mouth of the head member 43 of the tube container 40, the capped tube container 40A shown in Fig. 1 is obtained.

[0081] Thereafter, the interior of the body tube 41 of the capped tube container 40A is filled with the contents from the bottom side, and the bottom of the body tube 41 is sealed, thereby obtaining the capped tube container 40A with contents as a product.

[0082] As described above, according to the present embodiment, the laminate 10 includes a first sealant layer 11 that constitutes the outer surface 101, a second sealant layer 12 that constitutes the inner surface 102, and a base material layer 13 provided between the first sealant layer 11 and the second sealant layer 12. 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 3 μm or more and 12 μm or less. Also, the arithmetic mean curvature Spc of the convex portion 104, measured in accordance with ISO 25178-2:2012, is 350 μm or more and 700 μm or less. Further, the coefficient of kinetic friction of the inner surface 102 with respect to metal is 0.32 or more and 0.70 or less. Thus, in the present embodiment, the surface roughness Sa of the inner surface, measured in accordance with ISO 25178-2:2012, is 3 μm or more, the arithmetic mean curvature Spc of the convex portion 104, measured in accordance with ISO 25178-2:2012, is 350 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.

[0083] Also, in the present embodiment, the surface roughness Sa of the inner surface, measured in accordance with ISO 25178-2:2012, is 12 μm or less, the arithmetic mean curvature Spc of the convex portion 104, measured in accordance with ISO 25178-2:2012, is 700 μm or less, and the coefficient of kinetic friction of the inner surface 102 with respect to metal is 0.70 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.

[0084] 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 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 coefficient of static friction of the inner surface 102 with respect to the metal is 0.75 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 when manufacturing the body tube 41. Note that the fact that such an effect can be obtained will be described in the examples described later.

[0085] Also, in the present embodiment, in the laminate 10, at least 90% or more is made of the same resin-based material. Thereby, the tube container 40 manufactured from the laminate 10 can be easily recycled.

[0086] Also, according to the present 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

[0087] Next, specific examples in the above embodiment will be described.

[0088] (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 uniaxially stretched milky white high-density polyethylene film (manufactured by Tokyo Ink Co., Ltd., Hybrone SMKQW (trade name), thickness 25 μm) was prepared.

[0089] Next, a urethane-based gravure ink (manufactured by Tokyo Ink Co., Ltd.) was applied by gravure printing onto a uniaxially stretched opal HDPE 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 10a of the laminate 10 was produced. The layer structure of the obtained first intermediate 10a is as follows. Print / Opal HDPEF In the above, "Print" means the printed layer (the same applies hereinafter). Also, "HDPEF" means a uniaxially stretched high-density polyethylene film (the same applies hereinafter).

[0090] Also, the second intermediate 10b of the laminate 10 was produced. The second intermediate 10b was produced by the single extrusion lamination method.

[0091] At this time, first, as the barrier layer 17, a polyethylene resin film containing ethylene-vinyl alcohol copolymer (EVOH) (EVOH-based barrier polyethylene film, thickness: 75 μm) was prepared. Also, as the second sealant layer 12, an opal polyethylene film (manufactured by DNP Techno Pack Co., Ltd., SR-WN2 Opal (trade name), thickness: 100 μm) was prepared.

[0092] Next, low-density polyethylene (manufactured by Japan Polyethylene Corporation, Novatech LD LC602A (trade name), MFR: 8.2 g / 10 min, density: 0.919 g / cm 3 , melting point: 107°C) was melt-extruded at 330°C to form an extruded polyethylene layer (the third adhesive layer 14c) with a thickness of 30 μm. Also, at this time, through the extruded polyethylene layer (the third adhesive layer 14c), the opal polyethylene film as the second sealant layer 12 was laminated. Then, it was cooled by a cooling roll 86. At this time, as the cooling roll 86, a cooling roll with an uneven structure provided on its surface was used. 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. EVOHPEF / PE / Opal PEF In the above, "EVOHPEF" means a polyethylene resin film containing an ethylene-vinyl alcohol copolymer (the same shall apply hereinafter). Also, "PE" means an extruded polyethylene layer as an adhesive layer (the same shall apply hereinafter). Further, "milky white PEF" means a milky white polyethylene film (the same shall apply hereinafter).

[0093] Next, using the first intermediate 10a and the second intermediate 10b, the laminate 10 was produced. The laminate 10 was produced by the tandem extrusion lamination method.

[0094] At this time, first, the above-mentioned first intermediate 10a and the above-mentioned second intermediate 10b were prepared. Also, as the first sealant layer 11, a polyethylene film containing an antistatic agent (manufactured by Dainippon Printing Co., Ltd., SP100AS (trade name), thickness 80 μm) was prepared.

[0095] Next, on the resin film as the barrier layer 17 of the second intermediate 10b, low-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., Novatec LD LC602A (trade name), MFR: 8.2 g / 10 min, density: 0.919 g / cm 3 , melting point: 107°C) was melt-extruded at 330°C to form an extruded polyethylene layer (second adhesive layer 14b) with a thickness of 20 μm. Also, at this time, the first intermediate 10a was laminated via the extruded polyethylene layer (second adhesive layer 14b).

[0096] Also, an anchor coat agent (manufactured by Toyo Morton Co., Ltd., EL-510 / CAT-RT80 (trade name), diluting solvent: ethyl acetate) was applied onto the printing layer 16 of the first intermediate 10a, and then dried to form an anchor coat layer 15 (thickness 0.3 μm).

[0097] Next, on the anchor coat layer 15, low-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., Novatec LD LC602A (trade name), MFR: 8.2 g / 10 min, density: 0.919 g / cm 3, (Melting point: 107°C) was melt-extruded at 330°C to form an extruded polyethylene layer (first adhesive layer 14a) with a thickness of 20 μm. At this time, a polyethylene film as the first sealant layer 11 was laminated via the extruded polyethylene layer (first adhesive layer 14a). In this way, a plurality of laminates 10 were produced. The layer configuration of the obtained laminate 10 is as follows. Antistatic PEF / PE / AC / Print / Opalescent HDPEF / PE / EVOHPEF / PE / Opalescent PEF In the above, "Antistatic PEF" means a polyethylene film containing an antistatic agent (the same applies hereinafter). Also, "AC" means an anchor coat layer (the same applies hereinafter).

[0098] 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 at 300 pieces / min, and a total of 750 body tubes 41, 250 pieces for each sample, were produced.

[0099] 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.

[0100] In this way, a total of 750 tube containers 40 were produced.

[0101] (Example 2) The laminate 10 shown in FIG. 2B was produced. At this time, first, a first intermediate of the laminate 10 was produced. When producing the first intermediate, first, as the base material layer 13, a uniaxially stretched opalescent high-density polyethylene film (manufactured by Tokyo Ink Co., Ltd., Hybrone SMKQW (trade name), thickness 25 μm) was prepared.

[0102] Next, a urethane-based gravure ink (manufactured by Tokyo Ink Co., Ltd.) was applied by gravure printing onto a uniaxially stretched milky white HDPE 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 of the laminate 10 was produced. The layer configuration of the obtained first intermediate is as follows. Print / HDPEF

[0103] Also, the second intermediate of the laminate 10 was produced. The second intermediate was produced by the tandem extrusion lamination method.

[0104] At this time, first, as the barrier layer 17, a polyethylene resin film containing ethylene-vinyl alcohol copolymer (EVOH) (EVOH-based polyethylene barrier film, thickness 75 μm) was prepared. Also, as the intermediate layer 18, a milky white polyethylene film (manufactured by DNP Techno Pack Co., Ltd., SR-WN2 milky white (trade name), thickness 50 μm) was prepared. Further, as the second sealant layer 12, a polyethylene film (manufactured by Icello Co., Ltd., Suzuron L-100N (trade name), thickness 50 μm) was prepared.

[0105] Next, low-density polyethylene (manufactured by Japan Polyethylene Corporation, Novatech LD LC602A (trade name), MFR: 8.2 g / 10 min, density: 0.919 g / cm 3 , melting point: 107 °C) was melt-extruded at 330 °C to form an extruded polyethylene layer (third adhesive layer 14c) with a thickness of 20 μm. Also, at this time, a milky white polyethylene film as the intermediate layer 18 was laminated via the extruded polyethylene layer (third adhesive layer 14c).

[0106] Also, on the milky white polyethylene film as the intermediate layer 18, low-density polyethylene (manufactured by Japan Polyethylene Corporation, Novatech LD LC602A (trade name), MFR: 8.2 g / 10 min, density: 0.919 g / cm 3, a melting point of 107°C) was melt-extruded at 330°C to form an extruded polyethylene layer (fourth adhesive layer 14d) with a thickness of 30 μm. At this time, a polyethylene film as the second sealant layer 12 was laminated via the extruded polyethylene layer (fourth adhesive layer 14d). At this time, a cooling roll having an uneven structure on its surface was used as the cooling roll 86. In this way, the second intermediate 10b of the laminate 10 was produced. The layer configuration of the obtained second intermediate 10b is as follows. EVOHPEF / PE / Opalescent PEF / PE / PEF In the above, "PEF" means a polyethylene film (the same applies hereinafter).

[0107] Next, the laminate 10 was produced using the first intermediate 10a and the second intermediate 10b. The laminate 10 was produced by the tandem extrusion lamination method.

[0108] At this time, first, the above-described first intermediate 10a and the above-described second intermediate 10b were prepared. Also, as the first sealant layer 11, a polyethylene film containing an antistatic agent (manufactured by Dainippon Printing Co., Ltd., SP100AS (trade name), thickness 50 μm) was prepared.

[0109] Next, on the resin film as the barrier layer 17 of the second intermediate 10b, low-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., Novatech LD LC602A (trade name), MFR: 8.2 g / 10 min, density: 0.919 g / cm 3 , a melting point of 107°C) was melt-extruded at 330°C to form an extruded polyethylene layer (second adhesive layer 14b) with a thickness of 20 μm. At this time, the first intermediate 10a was laminated via the extruded polyethylene layer (second adhesive layer 14b).

[0110] Also, an anchor coat agent (manufactured by Toyo Morton Co., Ltd., EL-510 / CAT-RT80 (trade name), diluting solvent: ethyl acetate) was applied onto the printing layer 16 of the first intermediate 10a, and then dried to form an anchor coat layer 15 (thickness 0.3 μm).

[0111] Next, on the anchor coat layer 15, low-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., Novatec LD LC602A (trade name), MFR: 8.2 g / 10 min, density: 0.919 g / cm 3 , melting point: 107°C) was melt-extruded at 330°C to form an extruded polyethylene layer (first adhesive layer 14a) with a thickness of 20 μm. At this time, a polyethylene film as the first sealant layer 11 was laminated via the extruded polyethylene layer (first adhesive layer 14a). In this way, a plurality of laminates 10 were produced. The layer structure of the obtained laminate 10 is as follows. Charged PEF / PE / AC / Print / Milky white HDPEF / PE / EVOHPEF / PE / Milky white PEF / PE / PEF

[0112] 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, after joining the laminate 10 by heat sealing with the inner seal member 80 and the 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 produced.

[0113] Thereafter, these body tubes 41 were each 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.

[0114] In this way, a total of 750 tube containers 40 were produced.

[0115] (Example 3) As the first sealant layer 11, a polyethylene film containing an antistatic agent (manufactured by DNP Techno Pack Co., Ltd., MPRAS (trade name), thickness 50 μm) was used, and as the second sealant layer 12, a polyethylene film (manufactured by DNP Techno Pack, MP3, thickness 50 μm) was used. Except for this, in the same manner as in Example 2, the laminate 10 and the tube container 40 were produced.

[0116] (Comparative Example 1) A cooling roll having no concavo-convex structure on its surface was used. Except for this, in the same manner as in Example 1, the laminate and the tube container were produced.

[0117] (Comparative Example 2) A cooling roll having no concavo-convex structure on its surface was used. Except for this, in the same manner as in Example 2, the laminate and the tube container were produced.

[0118] (Comparative Example 3) A cooling roll having no concavo-convex structure on its surface was used. Except for this, in the same manner as in Example 3, the laminate and the tube container were produced.

[0119] (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 Examples 1 to Comparative Example 3 were measured. The surface roughness Sa and the arithmetic mean curvature Spc were measured by a method conforming to ISO 25178-2:2012. At this time, the surface roughness Sa and the arithmetic mean curvature Spc were measured in 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.

[0120] (Static friction coefficient measurement test · Kinetic friction coefficient measurement test) The coefficient of static friction and the coefficient of kinetic friction of the inner surface of the laminate according to Examples 1 to Comparative Example 3 were measured respectively. The coefficient of static friction and the coefficient of kinetic friction 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. Further, the laminate 10 was cut out into test pieces of 80 mm × 200 mm using a specified mold. Further, 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 overlaid on 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 the kinetic frictional force (N) between the test piece and the mating material were measured, and the coefficient of static friction and the coefficient of kinetic friction were calculated by dividing the static frictional force and the kinetic frictional force by the normal force (1.96 N) of the sliding piece. The coefficient of kinetic friction 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 coefficient of static friction and the coefficient of kinetic friction were measured for each test piece. Then, for each of the surface coefficient of static friction and the coefficient of kinetic friction, the average value of the values of the three test pieces was taken as the coefficient of static friction or the coefficient of kinetic friction of the laminate.

[0121] <Adhesion Evaluation and Scratch Resistance Evaluation> Further, test pieces were obtained by cutting the body seal portion of the tube container into strips 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.

[0122] <Scratch Resistance Evaluation> Next, the number of scratches 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.

[0123] The above results are shown in Tables 1 and 2.

[0124]

Table 1

[0125]

Table 2

[0126] In Table 2 above, "good" in the column of "bondability" means that no appearance defects such as peeling between laminates occurred in all the body seal parts of the three test pieces.

[0127] Also, in Table 2 above, "good" in the column of "scratch resistance" means that the average number of scratches generated on the inner surface of the body tube is less than 20, and no resin scraps (powder) are generated. Also, "bad" in the column of "scratch resistance" means that the average number of scratches generated on the inner surface of the body tube is 20 or more, and resin scraps (powder) are generated.

[0128] Also, in Table 2 above, "good" in the column of "wrinkle" means that no wrinkles occurred on the outer surface of the body tube. Also, "bad" in the column of "wrinkle" means that wrinkles occurred on the outer surface of the body tube.

[0129] Also, in Table 2 above, "good" in the column of "slip" means that no slippage of the laminate against the conveyor belt occurred when manufacturing the body tube. Also, "bad" in the column of "wrinkle" means that slippage of the laminate against the conveyor belt occurred when manufacturing the head tube.

[0130] As a result, in the tube containers of Comparative Examples 1 to 3, as shown in Table 1, the static friction coefficient of the inner surface of the laminate was 0.28 or more and 0.30 or less, and the kinetic friction coefficient was 0.24 or more and 0.27 or less. And, in the tube containers of Comparative Examples 1 to 3, as shown in Table 2, an average of 20 or more scratches and resin chips were generated on the inner surface of the body tube. Also, in the tube containers of Comparative Examples 1 to 3, wrinkles were generated 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 Examples 1 to 3, as shown in Table 1, the static friction coefficient of the inner surface 102 of the laminate 10 was 0.35 or more and 0.47 or less, and the kinetic friction coefficient was 0.34 or more and 0.43 or less. And, in the tube containers 40 according to Examples 1 to 3, 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 Examples 1 to 3, wrinkles were not generated on the outer surface of the body tube, and slippage of the laminate with respect to the conveyor belt did not occur.

[0131] Thus, the tube containers 40 according to Examples 1 to 3 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 in the second sealant layer 12 to the inner seal member 80, and it was possible to suppress a decrease in the bonding property between the first sealant layer 11 and the second sealant layer 12. Also, the tube containers 40 according to Examples 1 to 3 were able to suppress the occurrence of wrinkles on the outer surface of the body tube and suppress the slippage of the laminate with respect to the conveyor belt.

[0132] Also, even when the slidability of the tube container 40 according to Examples 1 to 3 with respect to the inner seal member 80 of the laminate 10 was improved, as shown in Table 2, the bondability between the first sealant layer 11 and the second sealant layer 12 could be kept good.

[0133] 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 Signs

[0134] 10 Laminate 11 First sealant layer 12 Second sealant layer 13 Base material layer 40 Tube container 40A Tube container with cap 41 Body tube 42 One end 43 Head member 49 Cap 101 Outer surface 102 Inner surface 103 Recess 104 Projection

Claims

1. A first sealant layer constituting the outer surface, A second sealant layer constituting the inner surface, A base material layer provided between the first sealant layer and the second sealant layer, 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 3 μm or more and 12 μm or less, The arithmetic mean curvature Spc of the convex portion, measured in accordance with ISO 25178-2:2012, is 350 μm or more and 700 μm or less, The static friction coefficient of the inner surface with respect to metal is 0.35 or more and 0.75 or less, The kinetic friction coefficient of the inner surface with respect to metal is 0.32 or more and 0.70 or less, A laminate in which at least 90% or more is made of materials of the same resin system.

2. The laminate according to claim 1, wherein the material of the same resin system is a polyethylene-based resin.

3. The laminate according to claim 2, wherein the first sealant layer and the second sealant layer are made of a polyethylene-based resin.

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, A head member joined to one end of the body tube. A tube container comprising.

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

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