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 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 500 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 0.50 or less and the coefficient of dynamic friction is 0.33 or more and 0.48 or less. The barrier layer 17 is a vapor deposition layer of an inorganic oxide.SELECTED DRAWING: Figure 2

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) surface that is the outermost layer of both edge portions of the laminate and the resin layer (sealant layer) surface that is the innermost layer are overlapped. Then, for example, a seal member that performs heat sealing is used to weld the overlapped portion to manufacture the 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 is a problem that foreign substances (for example, precipitated pigments) due to the scratches adhere to the seal member, resulting in a decrease in 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 a decrease in the 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 [6].

[0008] [1] It includes a first sealant layer, a base material layer, a barrier layer, and a second sealant layer arranged 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 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 500 μm or less. The static friction coefficient of the inner surface with respect to metal is 0.35 or more and 0.50 or less. The coefficient of kinetic friction of the inner surface with respect to the metal is 0.33 or more and 0.48 or less, at least 90% or more is made of the same resin-based material, The barrier layer is a vapor deposition layer of an inorganic oxide, a laminate.

[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 each contain polyethylene.

[0011] [4] The laminate according to any one of [1] to [3], wherein the base material layer contains polyethylene or polyethylene terephthalate.

[0012] [5] 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 [4], and a head member joined to one end of the body tube, a tube container.

[0013] [6] In a capped tube container, the tube container according to [5], and a cap attached to the head member, a capped tube container.

Advantages of the Invention

[0014] According to the present disclosure, the slipperiness of the laminate can be improved.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0016] Hereinafter, an embodiment will be described with reference to the drawings. Figures 1 to 7 are diagrams showing an embodiment. Each of the following figures is a schematically shown diagram. Therefore, the size and shape of each part are appropriately exaggerated for easy understanding. Also, it can be implemented with appropriate changes without departing from the technical idea. In each of the following figures, the same parts are denoted by the same reference numerals, and some detailed explanations 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, are to be interpreted to include not only the strictly meant state but also substantially the same state.

[0017] As shown in Figure 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.

[0018] 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 substantially 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.

[0019] 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 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.

[0020] Also, 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.

[0021] 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.

[0022] Next, the layer structure of the laminate 10 will be described. FIG. 2 shows an example of the layer structure of the laminate 10 constituting the body tube 41. As shown in FIG. 2, 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.

[0023] Specifically, as shown in FIG. 2, the laminate 10 includes 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 first intermediate layer 18a, a third adhesive layer 14c, a barrier layer 17, a second intermediate layer 18b, a second anchor coat layer 15b, a fourth adhesive layer 14d, and a second sealant layer 12 in this order. In the example shown in FIG. 2, 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. In the present embodiment, the laminate 10 may not contain aluminum.

[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 the 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 acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, or 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, the density of low-density polyethylene is 910 kg / m 3 or more and 930 kg / m 3The following is polyethylene. Medium-density polyethylene has a density of 930 kg / m 3 or more and 942 kg / m 3 or less. Further, high-density polyethylene has 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 a medium pressure 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 polyethylene. Linear low-density polyethylene is obtained by copolymerizing an α-olefin with a linear polymer obtained by polymerizing ethylene at a 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 ), 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 bonded 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 heat-sealable film described above, for example, one 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, 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] Note that, as the material of the first sealant layer 11 described above, 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, first intermediate layer, and second intermediate layer The base material layer 13, the first intermediate layer 18a, and the second intermediate layer 18b (hereinafter, also simply referred to as the base material layer 13, etc.) are layers for supporting, for example, the first sealant layer 11 and the second sealant layer 12 and enhancing 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, films of extruded low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene can be used.

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

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

[0035] In the present embodiment, the thickness of the base material layer 13, etc. is 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 together, and as the material constituting the second sealant layer 12, for example, the same material as the above-mentioned first sealant layer 11 can be used.

[0037] As described above, the second sealant layer 12 is the layer that constitutes the inner surface 102 of the laminate 10. In this case, as shown in FIG. 3, the inner surface 102 is provided with an uneven structure including a plurality of concave portions 103 and a plurality of convex portions 104. 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, which is 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 a reference plane (average plane) S (see FIG. 3).

[0039] Further, 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 500 μm or less. The arithmetic mean curvature Spc of the inner surface 102 means the average of the curvatures of the tops of the convex portions 104. The larger the arithmetic mean curvature Spc, the smaller the radius of curvature of 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 of 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 compliant with ISO 25178-2:2012. At this time, the surface roughness Sa and the arithmetic mean curvature Spc are measured in 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] Also, in the present embodiment, the coefficient of static friction of the inner surface 102 with respect to the metal is 0.35 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 0.33 or more and 0.48 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 and kinetic friction coefficient measurement test.

[0044] (Static Friction Coefficient Measurement Test and Kinetic Friction Coefficient Measurement Test) The static friction coefficient and the dynamic 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 dynamic friction coefficient are measured. At this time, first, the measuring device and the laminate are stabilized in an environment of 26°C. Also, the laminate is cut into test pieces of 80 mm × 200 mm using a specified mold. Further, a mating material that contacts the cut test piece is prepared. In this case, as the mating material, one made of metal, for example, stainless steel, is used. Next, the test piece is overlapped 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 dynamic frictional force (N) between the test piece and the mating material are measured, and the static friction coefficient and the dynamic friction coefficient are calculated by dividing the static frictional force and the dynamic frictional force by the normal force (1.96 N) of the sliding piece. The dynamic 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 dynamic friction coefficient are measured. Then, for each of the surface static friction coefficient and the dynamic friction coefficient, the average value of the values of the three test pieces is taken as the static friction coefficient or the dynamic 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 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 dynamic friction coefficient of the inner surface 102 with respect to the metal is 0.33 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 12 μm or less, the arithmetic mean curvature Spc of the convex portion 104 measured in accordance with ISO 25178-2:2012 is 500 μm or less, and the coefficient of kinetic friction of the inner surface 102 with respect to the metal is 0.48 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.) due to 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. Also, since the coefficient of static friction of the inner surface 102 with respect to the metal is 0.50 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, and the fourth adhesive layer 14d 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 this 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 arbitrary method. Further, when performing the above-described lamination, if necessary, pretreatment such as corona treatment or ozone treatment can be applied to the film.

[0054] Anchor coat layer Anchor coat layers such as the first anchor coat layer 15a and the second anchor coat layer 15b 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 any resin with 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 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 are optionally added, and 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. Examples of such ink vehicles include, 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 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, and others, and one or two or more of them 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.

[0056] 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 for the contents can be used.

[0057] In the present embodiment, the barrier layer 17 is a vapor deposition layer of an inorganic oxide. The vapor deposition layer of an inorganic oxide may be a transparent vapor deposition layer. The transparent vapor deposition layer may be a transparent vapor deposition layer formed by a conventionally known method.

[0058] As the transparent vapor deposition layer, for example, a vapor deposition layer 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. In particular, for a tube container, it is preferable to provide a vapor deposition layer of aluminum oxide or silicon oxide.

[0059] The notation of the inorganic oxide is, for example, MO such as SiO X , AlO X etc. 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 is 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 single substance (pure substance), which is not transparent, and the upper limit of the range of X is the value after 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.

[0060] 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, more preferably 100 Å or more and 300 Å or less is desirable.

[0061] The transparent vapor deposition layer can be formed on the second intermediate layer 18b using the following formation method. As the formation method of the vapor deposition layer, for example, physical vapor deposition methods such as vacuum vapor deposition method, sputtering method, and ion plating method (Physical Vapor Deposition method, PVD method), or chemical vapor deposition methods such as plasma chemical vapor deposition method, thermal chemical vapor deposition method, and photo chemical vapor deposition method (Chemical Vapor Deposition method, CVD method), etc. can be mentioned. Specifically, using a roller-type vapor deposition layer forming apparatus, the vapor deposition layer can be formed on the forming roller.

[0062] 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 first intermediate layer 18a 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.

[0063] 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.

[0064] Next, with reference to FIGS. 4(a)-(c) and 5, the manufacturing method of the laminate 10 will be described, and with reference to FIGS. 6(a)-(c) and 7(a)-(b), the manufacturing method of the tube container 40 will be described.

[0065] First, with reference to FIGS. 4(a)-(c) and 5, the manufacturing method of the laminate 10 will be described.

[0066] In this case, first, as shown in FIG. 4(a), a first intermediate body 10a of the laminate 10 is produced.

[0067] When producing the first intermediate body 10a, first, as the base material layer 13, for example, a biaxially stretched polyethylene terephthalate film is prepared.

[0068] Next, on the biaxially stretched polyethylene terephthalate film as the base material layer 13, for example, a urethane-based gravure ink is applied 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)).

[0069] Also, as shown in FIG. 4(b), the second intermediate body 10b of the laminate 10 is produced. The second intermediate body 10b may be produced by the dry lamination method.

[0070] At this time, first, as the first intermediate layer 18a, for example, an opaque polyethylene film is prepared. Also, as the second intermediate layer 18b, for example, a biaxially stretched polyethylene terephthalate film provided with a vapor deposition layer of silicon oxide (barrier layer 17) is prepared.

[0071] Next, an adhesive is applied onto the vapor deposition layer provided on the biaxially stretched polyethylene terephthalate film as the second intermediate layer 18b to form an adhesive layer (the third adhesive layer 14c). Also, through this adhesive layer, the first intermediate layer 18a and the second intermediate layer 18b are bonded together. In this way, the second intermediate body 10b of the laminate 10 is obtained (see FIG. 4(b)).

[0072] Next, as shown in FIG. 4(c), the third intermediate body 10c of the laminate 10 is produced. The third intermediate body 10c may be produced by the single extrusion lamination method.

[0073] At this time, first, as the second sealant layer 12, for example, a polyethylene film is prepared.

[0074] Next, an anchor coat agent is applied onto the biaxially stretched polyethylene terephthalate film as the second intermediate layer 18b of the second intermediate body 10b, and then dried to form an anchor coat layer (the second anchor coat layer 15b). Next, from an extruder 85 (see FIG. 5), for example, an ethylene-methacrylic acid copolymer (EMAA) is extruded onto the anchor coat layer to form an extruded ethylene-methacrylic acid copolymer layer with a thickness of 25 μm (the extruded EMAA layer (the fourth adhesive layer 14d)). Also, at this time, through the extruded EMAA layer (the fourth adhesive layer 14d), the polyethylene film as the second sealant layer 12 is bonded together. In this way, the third intermediate body 10c of the laminate 10 is obtained (see FIG. 4(c)).

[0075] Here, as shown in FIG. 5, the second intermediate body 10b and the polyethylene film as the second sealant layer 12, which are bonded to each other, are cooled by the cooling roll 86. On the surface of this cooling roll 86, an uneven structure corresponding to the uneven structure provided on the inner surface 102 of the laminate 10 is provided. Then, when the second intermediate body 10b and the polyethylene film as the second sealant layer 12 are 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).

[0076] Next, the laminate 10 is produced from the third intermediate body 10c of the laminate 10. The laminate 10 may be produced by a tandem extrusion lamination method.

[0077] At this time, first, as the first sealant layer 11, for example, a polyethylene film is prepared.

[0078] Next, for example, low-density polyethylene is extruded onto the milky white polyethylene film as the first intermediate layer 18a of the third intermediate body 10c to form an extruded polyethylene layer (second adhesive layer 14b) with a thickness of 25 μm. Also, at this time, the first intermediate body 10a is bonded through the extruded polyethylene layer (second adhesive layer 14b).

[0079] Next, an anchor coat agent is applied onto the polyethylene terephthalate film as the base material layer 13 of the first intermediate body 10a bonded to the third intermediate body 10c, and then dried to form an anchor coat layer (first anchor coat layer 15a) (see FIG. 2). Next, for example, low-density polyethylene is extruded onto the anchor coat layer to form an extruded polyethylene layer (first adhesive layer 14a) with a thickness of 25 μm (see FIG. 2). Also, at this time, the polyethylene film as the first sealant layer 11 is bonded through the extruded polyethylene layer (first adhesive layer 14a). In this way, the laminate 10 shown in FIG. 2 is obtained.

[0080] Next, a method for manufacturing the tube container 40 from the obtained laminate 10 will be described.

[0081] First, the laminate 10 is rolled up, and the opposing edge portions are joined to each other, for example, by heat sealing to form a cylindrical tube, thereby producing a 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. 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).

[0082] 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.

[0083] 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.

[0084] Next, the above-described tube container 40 is manufactured by a compression molding method using the joined laminate 10 (body tube 41).

[0085] First, as shown in Fig. 7(a), this cylindrical laminate 10 (barrel 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 (barrel tube 41) preformed 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 molding the head member 43.

[0086] 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 barrel tube 41 into the mold 83, the head member 43 is molded, and at the same time, the barrel tube 41 is integrally fused to the head member 43. Then, the head member 43 and the barrel tube 41 integrated together are taken out from the mold 83 and the mandrel 82, thereby obtaining the tube container 40 (see Fig. 7(b)).

[0087] 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 cap 49 is screwed onto the mouth of the head member 43 of the tube container 40, thereby obtaining the capped tube container 40A shown in Fig. 1.

[0088] Thereafter, the inside of the barrel tube 41 of the capped tube container 40A is filled with the contents from the bottom side, and the bottom of the barrel tube 41 is sealed, thereby obtaining the capped tube container 40A with contents as a product.

[0089] 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 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 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 500 μm or less. Further, the coefficient of kinetic friction of the inner surface 102 with respect to metal is 0.33 or more and 0.48 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 0.33 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. The fact that such an effect can be obtained will be described in the examples described later.

[0090] 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 500 μm or less, and the coefficient of kinetic friction of the inner surface 102 with respect to metal is 0.48 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. The fact that such an effect can be obtained will be described in the examples described later.

[0091] 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 0.50 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.

[0092] Also, in this embodiment, in the laminate 10, the barrier layer 17 is a vapor deposition layer of an inorganic oxide. Thereby, even when an aluminum foil is not used, the permeation of oxygen and water vapor can be sufficiently blocked. For this reason, an environmentally friendly and highly barrier laminate 10 can be obtained.

[0093] 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

[0094] Next, specific examples in the above embodiment will be described.

[0095] (Example 1) The laminate 10 shown in FIG. 2 was manufactured. At this time, first, a first intermediate 10a of the laminate 10 was manufactured. When manufacturing the first intermediate 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.

[0096] Next, a urethane-based gravure ink (manufactured by Toyo Ink Co., Ltd., NEW-LP Super (trade name)) was applied by gravure printing onto a 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 10a of the laminate 10 was produced. The layer configuration 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 printed layer (the same applies hereinafter).

[0097] Next, the second intermediate 10b of the laminate 10 was produced. The second intermediate 10b was produced by the dry lamination method.

[0098] At this time, first, an opal polyethylene film (manufactured by DNP Techno Pack Co., Ltd., DNW20 (trade name), thickness 80 μm) was prepared as the first intermediate layer 18a. Also, a biaxially stretched polyethylene terephthalate film (manufactured by DNP Techno Pack Co., Ltd., IB-PET-WBUB (trade name), thickness 12 μm) provided with a vapor deposition layer (barrier layer 17) was prepared as the second intermediate layer 18b.

[0099] Next, an adhesive was applied onto the vapor deposition layer provided on the biaxially stretched polyethylene terephthalate film as the second intermediate layer 18b to form an adhesive layer (the third adhesive layer 14c). Further, the first intermediate layer 18a and the second intermediate layer 18b were bonded together through this adhesive layer. 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. Opal PEF / DL / Vapor deposition layer / PET In the above, "Opal PEF" means an opal polyethylene film (the same applies hereinafter). Also, "DL" means an adhesive layer. (the same applies hereinafter).

[0100] Next, the third intermediate 10c of the laminate 10 was produced. The third intermediate 10c was produced by the single extrusion lamination method.

[0101] At this time, first, as the second sealant layer 12, a polyethylene film (manufactured by ISEL Co., Ltd., L100N (trade name), 80 μm) was prepared.

[0102] Next, an anchor coat agent was applied onto the biaxially stretched polyethylene terephthalate film as the second intermediate layer 18b of the second intermediate 10b, and then dried to form an anchor coat layer (second anchor coat layer 15b). Next, an ethylene-methacrylic acid copolymer (EMAA) (manufactured by Mitsui Dow Polychemical Co., Ltd., Nuclel N1108C (trade name)) was extruded onto the anchor coat layer to form an extruded ethylene-methacrylic acid copolymer layer with a thickness of 25 μm (extruded EMAA layer (fourth adhesive layer 14d)). At this time, the polyethylene film as the second sealant layer 12 was bonded via the extruded EMAA layer (fourth adhesive layer 14d). Then, the second intermediate 10b 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. The layer structure of the obtained third intermediate 10c is as follows. Opalescent PEF / DL / Vapor deposition layer / PET / AC / EMAA (adhesive) / PEF In the above, "AC" means an anchor coat layer (the same applies hereinafter). Also, "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).

[0103] Next, the laminate 10 was produced using the third intermediate 10c of the laminate 10. The laminate 10 was produced by a tandem extrusion lamination method.

[0104] At this time, first, as the first sealant layer 11, a polyethylene film containing an antistatic agent (manufactured by DNP Technopack Co., Ltd., SR-WN2 AS (trade name), thickness 80 μm) was prepared.

[0105] Next, on the milky white polyethylene film as the first intermediate layer 18a of the third intermediate body 10c, low-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., Novatec LD LC602A (trade name)) was extruded to form an extruded polyethylene layer (second adhesive layer 14b) with a thickness of 25 μm. At this time, the first intermediate body 10a was bonded via the extruded polyethylene layer (second adhesive layer 14b).

[0106] Next, an anchor coat agent was applied onto the polyethylene terephthalate film as the base material layer 13 of the first intermediate body 10a bonded to the third intermediate body 10c, and then dried to form an anchor coat layer (first anchor coat layer 15a). Next, low-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., Novatec LD LC602A (trade name)) was extruded onto the anchor coat layer to form an extruded polyethylene layer (first adhesive layer 14a) with a thickness of 25 μm. At this time, a polyethylene film containing an antistatic agent as the first sealant layer 11 was bonded 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. ASPEF / PE(adhesion) / AC / PET / print / PE(adhesion) / milky white PEF / DL / vapor deposition layer / PET / AC / EMAA(adhesion) / PEF In the above, "PE(adhesion)" means an extruded polyethylene layer as an adhesive layer (the same applies hereinafter). Also, "ASPEF" means a polyethylene film containing an antistatic agent.

[0107] 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 high-frequency and heat sealing with the inner seal member 80 and the 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.

[0108] 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. High-density polyethylene (HDPE) was used as the material for the head member 43.

[0109] In this way, a total of 750 tube containers 40 were produced.

[0110] (Comparative Example 1) A laminate and a tube container were produced in the same manner as in Example 1, except that a cooling roll having no concavo-convex structure on its surface was used.

[0111] (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 and Comparative Example 1 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. The measurement was also 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.

[0112] (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 Example 1 and Comparative Example 1 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. 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 overlaid on the mating material so that the second sealant layer 12 faced the mating material, and a sliding piece was placed thereon. The total weight of the sliding pieces 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.

[0113] <Adhesion Evaluation and Scratch Resistance Evaluation> Also, 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 conducted for each test piece.

[0114] <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.

[0115] The above results are shown in Tables 1 and 2.

[0116]

Table 1

[0117]

Table 2

[0118] In Table 2 above, "good" in the column of "bonding property" means that no appearance defects such as peeling between the laminates occurred in all the body seal portions of the three test pieces.

[0119] 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 was less than 20, and no resin chips (powder) were 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 was 20 or more, and resin chips (powder) were generated.

[0120] 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.

[0121] 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.

[0122] As a result, in the tube container of Comparative Example 1, 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 0.27. And, in the tube container of Comparative Example 1, 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 container of Comparative Example 1, 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 container 40 according to Example 1, as shown in Table 1, the static friction coefficient of the inner surface 102 of the laminate 10 was 0.39 and the kinetic friction coefficient was 0.38. And, in the tube container 40 according to Example 1, 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 container of Example 1, 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.

[0123] Thus, the tube container 40 according to Example 1 was 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 is possible to suppress the adhesion of foreign substances due to scratches generated in the second sealant layer 12 to the inner seal member 80, and it is possible to suppress the deterioration of the bonding property between the first sealant layer 11 and the second sealant layer 12. Also, the tube container 40 according to Example 1 was 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.

[0124] Also, the tube container 40 according to Example 1 was able to maintain good bonding properties between the first sealant layer 11 and the second sealant layer 12 as shown in Table 2 even when the slipperiness of the laminate 10 with respect to the inner seal member 80 was improved.

[0125] 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

[0126] 10 Laminated body 11 First sealant layer 12 Second sealant layer 13 Base material layer 17 Barrier 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 Protrusion

Claims

1. It comprises 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. 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 500 μm or less. The static friction coefficient of the inner surface with respect to metal is 0.35 or more and 0.50 or less. The kinetic friction coefficient of the inner surface with respect to metal is 0.33 or more and 0.48 or less. At least 90% or more is made of materials of the same resin system. The barrier layer is a vapor deposition layer of inorganic oxide, a laminate.

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 1, wherein the first sealant layer and the second sealant layer each contain polyethylene.

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

5. 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, a tube container.

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

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