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 recyclability while maintaining a desired performance.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, a base material layer 13 provided between the first sealant layer 11 and the second sealant layer 12 and a barrier layer 17 provided between the first sealant layer 11 and the base material layer 13 or between the base material layer 13 and the second sealant layer 12. The first sealant layer 11 and the second sealant layer 12 each contain an unstretched polypropylene resin having a density of 0.88 g / cm3 or moe and 0.90 g / cm3 or less. The base material layer 13 is a stretched polypropylene film. The barrier layer 17 is a vapor deposition layer composed of an inorganic oxide.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 technology]

[0002] Conventionally, many of the mono-material laminate tube containers under consideration as environmentally friendly packaging materials use polyethylene for the body tube (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-47774 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in tube containers using hinge caps, polypropylene is mainly used for the hinge caps instead of polyethylene, taking into consideration cracking properties, etc. For this reason, tube containers using polyethylene for the body tube have the problem that they are not suitable for recycling, including the cap. In addition, tube containers using polyethylene for the body tube have the problem that they are not suitable for filling with contents at high temperatures and for retort sterilization. In addition, tube containers using polyethylene for the body tube are also required to maintain performance such as sealability and printability.

[0005] The present disclosure has been made in consideration of these points, and aims to provide a laminate, a tube container, and a tube container with a cap that can improve recyclability while maintaining desired performance. [Means for solving the problem]

[0006] The embodiments of the present disclosure relate to the following [1] to

[14] .

[0007] [1] A first sealant layer forming an outer surface; A second sealant layer forming an inner surface; a base layer provided between the first sealant layer and the second sealant layer; a barrier layer provided between the first sealant layer and the base layer, The first sealant layer and the second sealant layer each have a density of 0.88 g / cm 3 More than 0.90g / cm 3 The unstretched polypropylene resin is The difference between the density of the unstretched polypropylene resin of the first sealant layer and the density of the unstretched polypropylene resin of the second sealant layer is 0.10 g / cm 3 is less than The base layer is a stretched polypropylene film, the barrier layer is a vapor-deposited layer made of an inorganic oxide, When the first sealant layer and the second sealant layer are heat-sealed, the adhesive strength between the first sealant layer and the second sealant layer is 5 N / 15 mm or more; When the second sealant layers are heat-sealed together, the adhesive strength between the second sealant layers is 5 N / 15 mm or more; When the first sealant layer and the second sealant layer are heat-sealed, the heat shrinkage rate of the first sealant layer and the heat shrinkage rate of the second sealant layer are each 5.0% or less; A laminate, wherein when the first sealant layer and the second sealant layer are heat-sealed, the heat shrinkage rate of the base layer is 25% or less.

[0008] [2] A first sealant layer forming an outer surface; A second sealant layer forming an inner surface; a base layer provided between the first sealant layer and the second sealant layer; a printed layer provided on a surface of the base layer facing the second sealant layer, The first sealant layer and the second sealant layer each have a density of 0.88 g / cm 3 More than 0.90g / cm 3 The unstretched polypropylene resin is The difference between the density of the unstretched polypropylene resin of the first sealant layer and the density of the unstretched polypropylene resin of the second sealant layer is 0.10 g / cm 3 is less than The base layer is a stretched polypropylene film, The printing layer includes silica, When the first sealant layer and the second sealant layer are heat-sealed, the adhesive strength between the first sealant layer and the second sealant layer is 5 N / 15 mm or more; When the second sealant layers are heat-sealed together, the adhesive strength between the second sealant layers is 5 N / 15 mm or more; When the first sealant layer and the second sealant layer are heat-sealed, a heat shrinkage rate of the first sealant layer and a heat shrinkage rate of the second sealant layer are 5.0% or less, A laminate, wherein when the first sealant layer and the second sealant layer are heat-sealed, the heat shrinkage rate of the base layer is 25% or less.

[0009] [3] The laminate according to [1] or [2], wherein a heat shrinkage rate of the first sealant layer and a heat shrinkage rate of the second sealant layer are each greater than a heat shrinkage rate of the base material layer.

[0010] [4] The laminate according to any one of [1] to [3], wherein the density of the unstretched polypropylene resin of the first sealant layer is equal to the density of the unstretched polypropylene resin of the second sealant layer.

[0011] [5] The laminate according to any one of [1] to [4], wherein the thickness of the first sealant layer is equal to or less than the thickness of the second sealant layer.

[0012] [6] The laminate described in any one of [1] to [5], wherein at least one of the first sealant layer, the base material layer, and the second sealant layer contains biomass-derived polypropylene and / or recycled polypropylene.

[0013] [7] The laminate described in any one of [1] to [6], further comprising a first adhesive layer provided between the first sealant layer and the base material layer, and a second adhesive layer provided between the base material layer and the second sealant layer.

[0014] [8] The laminate described in any one of [1] to [7], further comprising a printed layer provided on the base material layer or the barrier layer.

[0015] [9] At least one of the first sealant layer and the second sealant layer has a first layer, a second layer, a third layer, a fourth layer, and a fifth layer arranged in this order from the outer surface side to the inner surface side, the first layer comprises polypropylene; the second layer comprises an adhesive resin; the third layer contains a resin having a barrier property, the fourth layer includes an adhesive resin; The laminate according to any one of [1] to [8], wherein the fifth layer contains polypropylene.

[0016]

[10] The laminate according to any one of [1] to [9], wherein at least 90% or more is a polypropylene-based material and does not contain polyethylene terephthalate or aluminum foil.

[0017]

[11] In a tube container, [1] to

[10] , wherein the facing edges of the laminate are overlapped and joined to each other; and a head member joined to one end of the body tube.

[0018]

[12] The tube container according to

[11] , wherein the head member contains polypropylene.

[0019]

[13] In a tube container with a cap,

[11] or

[12] , and A capped tube container comprising: a cap attached to the head member.

[0020]

[14] The capped tube container according to

[13] , wherein the cap contains polypropylene. Effect of the Invention

[0021] According to the present disclosure, it is possible to improve recyclability while maintaining the desired performance of a tube container. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a partial vertical sectional view showing a capped tube container according to this embodiment. [Figure 2A] FIG. 2A is a cross-sectional view showing an example of a layer structure of the laminate according to the present embodiment. [Figure 2B] FIG. 2B is a cross-sectional view showing another example of the layer structure of the laminate according to the present embodiment. [Figure 2C] FIG. 2C is a cross-sectional view showing another example of the layer structure of the laminate according to the present embodiment. [Diagram 3] FIG. 3 is a cross-sectional view showing the layer configuration of the first sealant layer and the second sealant layer of the laminate according to the present embodiment. [Figure 4]4(a)-(d) are cross-sectional views showing a method for manufacturing a laminate according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] An embodiment will be described below with reference to the drawings. FIGS. 1 to 4 are diagrams showing an embodiment. Each of the figures shown below is a schematic diagram. Therefore, the size and shape of each part are appropriately exaggerated to facilitate understanding. In addition, the present invention can be modified appropriately within the scope of the technical concept. In each of the figures shown below, the same parts are given the same reference numerals, and some detailed explanations may be omitted. In addition, the numerical values ​​such as the dimensions of each member and the material names described in this specification are examples of an embodiment, and can be appropriately selected and used without being limited thereto. In this specification, terms that specify shapes and geometric conditions, such as parallel, orthogonal, and vertical, are interpreted to include substantially the same state in addition to their strict meanings.

[0024] As shown in FIG. 1, a capped tube container 40A according to this embodiment includes a tube container 40 and a cap 49 attached to a head member 43 of the tube container 40, which will be described later.

[0025] Of these, the tube container 40 comprises a body tube 41 which is a laminated molded 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. This 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 so that the outer surface of the packaging material for tube containers (i.e., the outer surface 101 of the laminate 10 described later) faces away from the contents, and the inner surface (i.e., the inner surface 102 of the laminate 10 described later) faces the contents.

[0026] The body tube 41 has a body seal portion 44 formed by joining two pieces of tube container packaging material together. 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 a tube container packaging material into a cylindrical shape, overlapping opposing edges of the tube container packaging material, and joining them together, for example, by heat sealing.

[0027] The body tube 41 also has a bottom seal portion 45 where pieces of the tube container packaging material are joined together. The bottom seal portion 45 is a portion where pieces of the tube container packaging material are joined together near an opening (not shown) formed at the other end 46 of the body tube 41 after an appropriate amount of content C is filled into the opening.

[0028] The head member 43 has a shoulder portion 47 and a mouth portion 48. A cap 49 is attached to the mouth portion 48. The head member 43 is molded, for example, by injection molding. The head member 43 and the cap 49 may contain, for example, polypropylene. This allows the body tube 41, the head member 43, and the cap 49 to be made into a mono-material in the capped tube container 40A, thereby improving recycling efficiency. In addition, polypropylene has a higher melting point than polyethylene, which allows hot filling at high temperatures and retort sterilization, etc., and thus expands the uses of the tube container.

[0029] The proportion of polypropylene resin in the head member 43 and the cap 49 is preferably 80% by mass or more, more preferably 85% by mass or more, even more preferably 88% by mass or more, and particularly preferably 90% by mass or more. This can improve the recyclability of the capped tube container 40A and increase the contribution to environmental consideration. The higher the proportion, the better, but the upper limit may be, for example, 99% by mass or 98% by mass.

[0030] Next, the layer structure of the laminate 10 will be described. FIG. 2A to FIG. 2C show an example of the layer structure of the laminate 10 constituting the body tube 41. As shown in FIG. 2A to FIG. 2C, the laminate 10 includes a first sealant layer 11 constituting the outer surface 101, a second sealant layer 12 constituting the inner surface 102, a base layer 13 provided between the first sealant layer 11 and the second sealant layer 12, and a barrier layer 17 provided between the first sealant layer 11 and the base layer 13 or between the base layer 13 and the second sealant layer 12. The laminate 10 may further include a first adhesive layer 14a provided between the first sealant layer 11 and the base layer 13, and a second adhesive layer 14b provided between the base layer 13 and the second sealant layer 12. The laminate 10 may further include a print layer 16 provided on the base layer 13 or on the barrier layer 17.

[0031] 2A, the laminate 10 includes, in this order, a first sealant layer 11, a first adhesive layer 14a, a base layer 13, a barrier layer 17, a printing layer 16, a second adhesive layer 14b, and a second sealant layer 12. The barrier layer 17 may be provided between the first sealant layer 11 and the base layer 13.

[0032] 2B, the laminate 10 includes, in this order, a first sealant layer 11, a first adhesive layer 14a, a base layer 13, a printing layer 16, a second adhesive layer 14b, a barrier layer 17, an intermediate layer 18, a third adhesive layer 14c, and a second sealant layer 12. The barrier layer 17 may be provided between the first sealant layer 11 and the base layer 13.

[0033] Furthermore, as shown in FIG. 2C, the laminate 10 includes a first sealant layer 11, a first adhesive layer 14a, a base layer 13, a printing layer 16, a second adhesive layer 14b, and a second sealant layer 12, in this order.

[0034] Each layer of the laminate 10 will now be described.

[0035] First sealant layer and second sealant layer The first sealant layer 11 and the second sealant layer 12 are layers for bonding the laminates 10 together. In this embodiment, the first sealant layer 11 and the second sealant layer 12 each have a density of 0.88 g / cm 3 More than 0.90g / cm 3 It contains an unstretched polypropylene resin that is as follows: The density of the unstretched polypropylene resin can be measured in accordance with JIS K7112:1999, Method D (density gradient tube method, 23°C).

[0036] The difference between the density of the unstretched polypropylene resin of the first sealant layer 11 and the density of the unstretched polypropylene resin of the second sealant layer 12 is 0.10 g / cm 3 is less than 100° C. This allows the melting point of the unstretched polypropylene resin of the first sealant layer 11 to be close to the melting point of the unstretched polypropylene resin of the second sealant layer 12. This prevents the first sealant layer 11 and the second sealant layer 12 from being insufficiently melted when the first sealant layer 11 and the second sealant layer 12 are heat-welded together in the body seal portion 44. This allows the end faces of the laminate 10 to be sufficiently covered by the first sealant layer 11 and the second sealant layer 12. As a result, when the contents are stored for a long period of time, delamination caused by the components of the contents can be prevented from occurring in the body tube 41.

[0037] The density of the unstretched polypropylene resin of the first sealant layer 11 may be equal to the density of the unstretched polypropylene resin of the second sealant layer 12. In this case, the melting point of the unstretched polypropylene resin of the first sealant layer 11 and the melting point of the unstretched polypropylene resin of the second sealant layer 12 become the same, improving the adhesion between the first sealant layer 11 and the second sealant layer 12. This allows the appearance of the body seal portion 44 to be improved.

[0038] In this embodiment, for example, when the first sealant layer 11 and the second sealant layer 12 are heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of 3 seconds, and a sealing temperature of 170° C., the adhesive strength between the first sealant layer 11 and the second sealant layer 12 is 5 N / 15 mm or more. In other words, when the first sealant layer 11 and the second sealant layer 12 are heat-sealed under the above sealing conditions, the adhesive strength of the body seal portion 44 is 5 N / 15 mm or more. This makes it possible to prevent the body seal portion 44 from peeling off.

[0039] For example, when the second sealant layers 12 are heat-sealed together under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of 3 seconds, and a sealing temperature of 170° C., the adhesive strength between the second sealant layers 12 is 5 N / 15 mm or more. That is, when the second sealant layers 12 are heat-sealed together under the above sealing conditions, the adhesive strength of the bottom seal portion 45 is 5 N / 15 mm or more. This makes it possible to prevent the bottom seal portion 45 from peeling off.

[0040] For example, when the first sealant layer 11 and the second sealant layer 12 are heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of 1 second, and a sealing temperature of 150° C., the heat shrinkage rate of the first sealant layer 11 and the heat shrinkage rate of the second sealant layer 12 are each 5.0% or less. By reducing the heat shrinkage in this manner, it is possible to suppress the longitudinal and lateral pitch variations of the product.

[0041] At least one of the first sealant layer 11, the second sealant layer 12, and the base layer 13 may contain biomass-derived polypropylene and / or recycled polypropylene, thereby reducing the environmental impact of the tube container 40 produced from the laminate 10.

[0042] In this case, the heat shrinkage rate of the first sealant layer 11 and the heat shrinkage rate of the second sealant layer 12 are preferably greater than that of the base layer 13. In other words, the heat shrinkage rate of the base layer 13 is preferably smaller than that of the first sealant layer 11 and the second sealant layer 12. Here, a printing layer 16 is provided on the base layer 13. For this reason, the heat shrinkage rate of the base layer 13 is smaller than that of the first sealant layer 11 and the second sealant layer 12, thereby making it possible to suppress problems such as printing being out of register.

[0043] Also, as shown in FIG. 3, at least one of the first sealant layer 11 and the second sealant layer 12 may have a first layer 21, a second layer 22, a third layer 23, a fourth layer 24, and a fifth layer 25 arranged in that order from the outer surface 101 side toward the inner surface 102 side.

[0044] In this case, the first layer 21 and the fifth layer 25 may each contain polypropylene. The second layer 22 and the fourth layer 24 may each contain an adhesive resin. In this case, the second layer 22 and the fourth layer 24 may have the same configuration as the first adhesive layer 14a, the second adhesive layer 14b, and the third adhesive layer 14c, respectively. The third layer 23 may contain a resin having barrier properties. In this case, for example, a resin film containing ethylene-vinyl alcohol copolymer (EVOH) may be used as the third layer 23. At least one of the first sealant layer 11 and the second sealant layer 12 has the above-mentioned first layer 21 to fifth layer 25, so that the barrier properties of the laminate 10 can be improved.

[0045] The thickness of the first sealant layer 11 may be equal to or less than the thickness of the second sealant layer 12. In other words, the thickness of the second sealant layer 12 may be equal to or more than the thickness of the first sealant layer 11. This allows the end surfaces of the base material layer 13, etc. to be sufficiently covered by the molten second sealant layer 12 in the body seal portion 44. In the present embodiment, the thickness of the first sealant layer 11 and the thickness of the second sealant layer 12 are each preferably 50 μm or more and 250 μm or less.

[0046] Base material layer The base material layer 13 is, for example, a layer that supports the first sealant layer 11 and the second sealant layer 12 and enhances the strength of the entire laminate 10. The base material layer 13 is also a layer on which a printed layer 16 is provided. In this embodiment, the base material layer 13 is a stretched polypropylene film. The stretched polypropylene film may be a uniaxially stretched film, or may be a biaxially stretched film.

[0047] In this embodiment, for example, when the first sealant layer 11 and the second sealant layer 12 are heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of 1 second, and a sealing temperature of 170° C., the heat shrinkage rate of the base layer 13 is 25% or less. This makes it possible to suppress problems such as printing not being able to be registered.

[0048] In the present embodiment, the thickness of each of the base layers 13 is preferably 10 μm or more and 25 μm or less.

[0049] adhesive layer The adhesive layers, such as the first adhesive layer 14a, the second adhesive layer 14b, and the third adhesive layer 14c, are layers for bonding together the first sealant layer 11, the base material layer 13, the intermediate layer 18, the second sealant layer 12, etc. The material used for these adhesive layers can be appropriately selected depending on the resin constituting the layers to be bonded.

[0050] As the adhesive layer, for example, an anchor coating agent such as an isocyanate-based (urethane-based), polyethyleneimine-based, polybutadiene-based, or organic titanium-based, or a polyurethane-based, polyacrylic-based, polyester-based, epoxy-based, polyvinyl acetate-based, cellulose-based, or other laminating adhesive can be arbitrarily used.

[0051] 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 suitably used.

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

[0053] The first sealant layer 11, the base layer 13, the intermediate layer 18, the second sealant layer 12, etc. may be laminated together by any method, such as wet lamination, dry lamination, solventless dry lamination, extrusion lamination, T-die coextrusion molding, coextrusion lamination, inflation, or any other method. When carrying out the above-mentioned lamination, the film may be subjected to a pretreatment, such as a corona treatment or an ozone treatment, if necessary.

[0054] printing layer The printed layer 16 is a layer on which a pattern or the like is printed, and is a layer for improving the design of the laminate 10. The printed layer 16 can be an ink composition obtained by adjusting an ink composition by adding one or more of ordinary ink vehicles as the main component, optionally adding one or more of plasticizers, stabilizers, antioxidants, light stabilizers, ultraviolet absorbers, curing agents, crosslinking agents, lubricants, antistatic agents, fillers, and other additives as necessary, and further adding a colorant such as a dye or pigment, and thoroughly kneading with a solvent, a diluent, etc. Examples of such ink vehicles include 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 resin, polyacetic acid resin, polystyrene resin, polyvinyl butyral resin, acrylic or methacrylic resin, polyamide resin, polyester resin, polyurethane resin, epoxy resin, urea resin, melamine resin, aminoalkyd resin, nitrocellulose, ethylcellulose, chlorinated rubber, cyclized rubber, and others. The printing method may be gravure printing, letterpress printing, screen printing, transfer printing, flexographic printing, or other printing methods. The printing layer may also be formed by gravure coating a coating agent containing silica.

[0055] Barrier Layer The barrier layer 17 is a layer for suppressing the transmission of oxygen gas, water vapor, etc. For example, a gas barrier material against oxygen gas, water vapor, etc., a light blocking material against sunlight, etc., or a material having aroma retention properties for the contents can be used as the barrier layer 17. Specifically, the barrier layer 17 may be a deposition layer that can be formed by a conventionally known method. In this case, the barrier layer 17 may be a transparent deposition layer made of a deposition layer of an inorganic oxide.

[0056] The transparent deposition layer may be, for example, a deposition layer of an oxide of 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. In particular, for a tube container, it is preferable to have a deposition layer of aluminum oxide or silicon oxide.

[0057] Inorganic oxides are expressed as, for example, SiO X , AlO X MO X (wherein, M represents an inorganic element, and the range of the value of X varies depending on the inorganic element). The range of the value of X is as follows: silicon (Si) is 0-2, aluminum (Al) is 0-1.5, magnesium (Mg) is 0-1, calcium (Ca) is 0-1, potassium (K) is 0-0.5, tin (Sn) is 0-2, sodium (Na) is 0-0.5, boron (B) is 0-1.5, titanium (Ti) is 0-2, lead (Pb) is 0-2, zirconium (Zr) is 0-2, and yttrium (Y) is 0-1.5. In the above, when X=0, it is a completely inorganic element (pure substance) and is not transparent, and the upper limit of the range of X is the value when it is completely oxidized. Silicon (Si) and aluminum (Al) are preferably used for the packaging material, and silicon (Si) with a value in the range of 1.0 to 2.0 and aluminum (Al) with a value in the range of 0.5 to 1.5 can be used.

[0058] The thickness of the transparent vapor deposition layer varies depending on the type of inorganic oxide used, but is desirably selected from the range of, for example, 50 Å to 2000 Å, preferably 100 Å to 1000 Å. For example, in the case of a vapor deposition layer of aluminum oxide or silicon oxide, the thickness is desirably 50 Å to 500 Å, more preferably 100 Å to 300 Å.

[0059] The transparent vapor deposition layer can be formed on the base layer 13 or the intermediate layer 18 by using the following formation methods. Examples of the method for forming the vapor deposition layer include physical vapor deposition methods (PVD methods) such as vacuum deposition, sputtering, and ion plating, and chemical vapor deposition methods (CVD methods) such as plasma chemical vapor deposition, thermal chemical vapor deposition, and photochemical vapor deposition. Specifically, the vapor deposition layer can be formed on a molding roller using a roller-type vapor deposition layer forming device.

[0060] Middle Tier The intermediate layer 18 is, for example, a layer for supporting the first sealant layer 11 and the second sealant layer 12 and increasing the strength of the entire laminate 10. Examples of materials that can be used for the intermediate layer 18 include films or sheets of polyester resins, polyamide resins, polyaramid resins, polyolefin resins, polycarbonate resins, polyacetal resins, fluorine resins, and other tough resins. As an example, the intermediate layer 18 does not need to contain polyethylene terephthalate or aluminum foil. The intermediate layer 18 may also contain polyethylene terephthalate. Examples of polyolefin resins that can be used include films of extruded low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, and polypropylene.

[0061] As the above-mentioned resin film or sheet, any of unstretched films, uniaxially or biaxially stretched films, etc. can be used. Among them, in the present embodiment, a biaxially stretched polyester resin film is preferred because of its excellent printability.

[0062] In the present embodiment, the thickness of each intermediate layer 18 is preferably 10 μm or more and 25 μm or less.

[0063] Other layers As other layers, for example, a concealing layer or an anchor coat layer may be provided. The concealing 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 printed layer 16. An olefin resin can be used for the concealing layer. More specifically, it is preferable to use a polyethylene film such as low density polyethylene, linear low density polyethylene, or medium density polyethylene as the concealing layer. These polyethylene films may be colored, for example, like a milky white polyethylene film. The thickness of the concealing layer is preferably, for example, 50 μm or more and 200 μm or less.

[0064] The anchor coat layer is a layer for enhancing the adhesion between layers. This anchor coat layer is formed by applying an anchor coat agent and drying it. The anchor coat agent may be any resin having a heat resistance of 135° C. or higher, such as a vinyl modified resin, an epoxy resin, a urethane resin, a polyester resin, or a polyethyleneimine. In particular, an anchor coat agent that is a cured product of a polyacrylic or polymethacrylic resin (polyol) having two or more hydroxyl groups in the structure and an isocyanate compound as a curing agent can be preferably used. In addition, a silane coupling agent may be used in combination with this as an additive, or nitrocellulose may be used in combination to enhance heat resistance. The anchor coat layer after drying is preferably 1 μm or more and 10 μm or less.

[0065] In such a laminate 10, at least 90% or more is made of materials of the same resin system (polypropylene system). In this case, the laminate 10 can be classified as a so-called mono-material material, and can be suitably used for producing a tube container made of the same material (so-called mono-material packaging container). Here, examples of polyethylene include high-density polyethylene and linear low-density polyethylene. These high-density polyethylene and linear low-density polyethylene are classified as "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.

[0066] Furthermore, the laminate 10 does not necessarily need to contain polyethylene terephthalate and aluminum foil, which can further improve the recyclability of the capped tube container 40A.

[0067] Next, a method for producing the laminate 10, the tube container 40, and the capped tube container 40A will be described with reference to FIGS.

[0068] 4(a), first, a base layer 13 is prepared. In this case, for example, a stretched polypropylene film provided with a deposition layer (barrier layer 17) may be used as the base layer 13.

[0069] Next, as shown in FIG. 4( b ), the printing layer 16 is formed on the barrier layer 17 .

[0070] Next, as shown in FIG. 4(c), the second sealant layer 12 is laminated on the printed layer 16 via the second adhesive layer 14b.

[0071] Thereafter, as shown in FIG. 4(d), the first sealant layer 11 is laminated on the base layer 13 via the first adhesive layer 14a.

[0072] In this manner, the laminate 10 is obtained.

[0073] Next, the obtained laminate 10 is used to produce a tube container 40 shown in Fig. 1. In this case, first, the laminate 10 is rolled and the opposing edges are joined together by, for example, heat sealing to form a cylindrical tube, thereby producing a body tube 41.

[0074] Further, the head member 43 and the cap 49 are produced by injection molding using, for example, an injection molding machine (not shown).

[0075] Next, the body tube 41 and the head member 43 are bonded together to produce the tube container 40. Then, the cap 49 is screwed onto the opening of the head member 43 of the tube container 40 to obtain the capped tube container 40A shown in FIG.

[0076] Thereafter, the contents are filled into the body tube 41 of the capped tube container 40A from the bottom side, and the bottom of the body tube 41 is sealed, thereby obtaining the capped tube container 40A containing the contents as a commercial product.

[0077] As described above, according to this embodiment, the laminate 10 includes the first sealant layer 11 constituting the outer surface 101, the second sealant layer 12 constituting the inner surface 102, the base material layer 13 provided between the first sealant layer 11 and the second sealant layer 12, and the barrier layer 17 provided between the first sealant layer 11 and the base material layer 13 or between the base material layer 13 and the second sealant layer 12. The first sealant layer 11 and the second sealant layer 12 each have a density of 0.88 g / cm 3 More than 0.90g / cm 3 The difference between the density of the unstretched polypropylene resin of the first sealant layer 11 and the density of the unstretched polypropylene resin of the second sealant layer 12 is 0.10 g / cm 3 is less than 100° C. This allows the melting point of the unstretched polypropylene resin of the first sealant layer 11 to be close to the melting point of the unstretched polypropylene resin of the second sealant layer 12. This prevents the first sealant layer 11 and the second sealant layer 12 from being insufficiently melted when the first sealant layer 11 and the second sealant layer 12 are heat-welded together in the body seal portion 44. This allows the end faces of the laminate 10 to be sufficiently covered by the first sealant layer 11 and the second sealant layer 12. As a result, when the contents are stored for a long period of time, delamination caused by the components of the contents can be prevented from occurring in the body tube 41.

[0078] Moreover, the first sealant layer 11 and the second sealant layer 12 contain unstretched polypropylene resin, the base layer 13 is a stretched polypropylene film, and the barrier layer 17 is a vapor deposition layer made of an inorganic oxide. This improves the recyclability of the tube container 40 produced from the laminate 10. Furthermore, polypropylene is a material that is stiffer than polyethylene at the same thickness. Therefore, by using polypropylene for the first sealant layer 11, the second sealant layer 12, and the base layer 13, the amount of plastic used in the body tube 41 can be reduced.

[0079] In addition, when the first sealant layer 11 and the second sealant layer 12 are heat-sealed together, the adhesive strength between the first sealant layer 11 and the second sealant layer 12 is 5 N / 15 mm or more, which can prevent the body seal portion 44 from peeling off.

[0080] In addition, when the second sealant layers 12 are heat sealed together, the adhesive strength between the second sealant layers 12 is 5 N / 15 mm or more, which can prevent the bottom seal portion 45 from peeling off.

[0081] In addition, when the first sealant layer 11 and the second sealant layer 12 are heat-sealed, the heat shrinkage rate of the first sealant layer 11 and the heat shrinkage rate of the second sealant layer 12 are each 5.0% or less. By reducing the heat shrinkage in this manner, it is possible to suppress the longitudinal and lateral pitch fluctuations of the product.

[0082] Furthermore, when the first sealant layer 11 and the second sealant layer 12 are heat-sealed, the heat shrinkage rate of the base layer 13 is 25% or less, which can prevent problems such as printing being out of register. EXAMPLES

[0083] Next, a specific example of the above embodiment will be described.

[0084] (Example 1-1) A laminate shown in Fig. 2A was produced by first preparing a stretched polypropylene film (manufactured by DNP Technopack Co., Ltd., IB-OPP (product name), thickness 20 µm) provided with a deposition layer (barrier layer) as a base layer.

[0085] Next, a urethane gravure ink (NEW-LP Super (product name) manufactured by Toyo Ink Mfg. Co., Ltd., etc.) was applied by gravure printing onto the deposition layer so as to have a dry thickness of 1 μm, and then dried to form a printed layer.

[0086] Next, a urethane-based two-component curing adhesive (manufactured by Rock Paint Co., Ltd., base agent: RN-920, curing agent: HN-920) was applied onto the printed layer and dried to form an adhesive layer (second adhesive layer) with a thickness of 1 μm. In addition, an unstretched polypropylene film (manufactured by Toray Advanced Film Co., Ltd., ZK99S (product name), density 0.889 g / cm) was applied onto the printed layer as a second sealant layer via this adhesive layer. 3 , thickness 100 μm) were bonded together.

[0087] Next, a urethane-based two-liquid curing adhesive (manufactured by Rock Paint, base agent: RN-920, curing agent: HN-920) was applied onto the substrate layer and dried to form an adhesive layer (first adhesive layer) with a thickness of 1 μm. In addition, an unstretched polypropylene film (manufactured by Toray Film Processing Co., Ltd., ZK99S (product name), density 0.889 g / cm) was applied onto the substrate layer as a first sealant layer via this adhesive layer. 3 100 μm) were laminated together. In this manner, a number of laminates were produced. The layer configuration of the resulting laminates was as follows: CPP / DL / OPP / deposited layer / printed layer / DL / CPP In the above, "CPP" means unoriented polypropylene film, "DL" means adhesive layer, and "OPP" means oriented polypropylene film.

[0088] The obtained laminate was used to produce a tube container as shown in Fig. 1. In this case, the laminate was first formed into a cylindrical shape to produce a body tube. At this time, the first sealant layer and the second sealant layer were heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C. Similarly, the second sealant layers were heat-sealed to each other under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C.

[0089] The head member was made of polypropylene by injection molding.

[0090] Next, the body tube and the head member were bonded together to prepare a tube container.

[0091] (Example 1-2) A laminate shown in Fig. 2A was produced by first preparing a stretched polypropylene film (manufactured by DNP Technopack Co., Ltd., IB-OPP (product name), thickness 20 µm) provided with a deposition layer (barrier layer) as a base layer.

[0092] Next, a urethane gravure ink (NEW-LP Super (product name) manufactured by Toyo Ink Mfg. Co., Ltd., etc.) was applied by gravure printing onto the deposition layer so as to have a dry thickness of 1 μm, and then dried to form a printed layer.

[0093] Next, polypropylene was extruded onto the printed layer to form an adhesive resin layer (second adhesive layer) having a thickness of 30 μm. In addition, an unstretched polypropylene film (ZK99S (product name), density 0.889 g / cm, manufactured by Toray Advanced Film Co., Ltd.) was applied as a second sealant layer onto the printed layer via the adhesive resin layer. 3 , thickness 100 μm) were bonded together.

[0094] Next, polypropylene was extruded onto the base layer to form an adhesive resin layer (first adhesive layer) having a thickness of 30 μm. In addition, an unstretched polypropylene film (ZK99S (product name), density 0.889 g / cm, manufactured by Toray Advanced Film Co., Ltd.) was applied as a first sealant layer onto the base layer via the adhesive resin layer. 3 100 μm) were laminated together. In this manner, a number of laminates were produced. The layer configuration of the resulting laminates was as follows: CPP / PP / OPP / deposited layer / printed layer / PP / CPP In the above, "PP" means polypropylene as the adhesive layer.

[0095] The obtained laminate was used to produce a tube container as shown in Fig. 1. In this case, the laminate was first formed into a cylindrical shape to produce a body tube. At this time, the first sealant layer and the second sealant layer were heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C. Similarly, the second sealant layers were heat-sealed to each other under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C.

[0096] The head member was made of polypropylene by injection molding.

[0097] Next, the body tube and the head member were bonded together to prepare a tube container.

[0098] (Example 2-1) A laminate shown in Fig. 2B was produced by first preparing a stretched polypropylene film (FOS-BT (product name), thickness 20 µm, manufactured by Futamura Chemical Co., Ltd.) as a base layer.

[0099] Next, a urethane gravure ink (NEW-LP Super (product name) manufactured by Toyo Ink Mfg. Co., Ltd., etc.) was applied onto the base layer by gravure printing so as to have a dry thickness of 1 μm, and then dried to form a printed layer.

[0100] Next, a urethane-based two-liquid curing adhesive (manufactured by Rock Paint Co., Ltd., base agent: RN-920, curing agent: HN-920) was applied onto the printed layer and dried to form an adhesive layer (second adhesive layer) with a thickness of 1 μm. In addition, a stretched polypropylene film (manufactured by Toray Advanced Film Co., Ltd., VM-OPP (product name), thickness 25 μm) provided with a vapor deposition layer (barrier layer) was bonded onto the printed layer as an intermediate layer via this adhesive layer.

[0101] Next, a urethane-based two-liquid curing adhesive (manufactured by Rock Paint, base agent: RN-920, curing agent: HN-920) was applied onto the intermediate layer and dried to form an adhesive layer (third adhesive layer) with a thickness of 1 μm. In addition, an unstretched polypropylene film (manufactured by Toray Film Processing Co., Ltd., ZK99S (product name), density 0.889 g / cm) was applied onto the intermediate layer as a second sealant layer via this adhesive layer. 3 , thickness 100 μm) were bonded together.

[0102] Next, a urethane-based two-component curing adhesive (manufactured by Rock Paint, base agent: RN-920, curing agent: HN-920) was applied onto the substrate layer and dried to form an adhesive layer (first adhesive layer) with a thickness of 1 μm. In addition, an unstretched polypropylene film (manufactured by Toray Film Processing Co., Ltd., ZK99S (product name), density 0.889 g / cm) was applied as a first sealant layer through this adhesive layer. 3 100 μm) were laminated together. In this manner, a number of laminates were produced. The layer configuration of the resulting laminates was as follows: CPP / DL / OPP / printed layer / DL / evaporated layer / OPP / DL / CPP

[0103] The obtained laminate was used to produce a tube container as shown in Fig. 1. In this case, the laminate was first formed into a cylindrical shape to produce a body tube. At this time, the first sealant layer and the second sealant layer were heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C. Similarly, the second sealant layers were heat-sealed to each other under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C.

[0104] The head member was made of polypropylene by injection molding.

[0105] Next, the body tube and the head member were bonded together to prepare a tube container.

[0106] (Example 2-2) A laminate shown in Fig. 2B was produced by first preparing a stretched polypropylene film (FOS-BT (product name), thickness 20 µm, manufactured by Futamura Chemical Co., Ltd.) as a base layer.

[0107] Next, a urethane gravure ink (NEW-LP Super (product name) manufactured by Toyo Ink Mfg. Co., Ltd., etc.) was applied onto the base layer by gravure printing so as to have a dry thickness of 1 μm, and then dried to form a printed layer.

[0108] Next, polypropylene was extruded onto the printed layer to form an adhesive resin layer (second adhesive layer) having a thickness of 30 μm. In addition, a stretched polypropylene film (manufactured by Toray Advanced Film Co., Ltd., VM-OPP (product name), thickness 25 μm) provided with a vapor deposition layer (barrier layer) was bonded onto the printed layer as an intermediate layer via this adhesive resin layer.

[0109] Next, polypropylene was extruded onto the intermediate layer to form an adhesive resin layer (third adhesive layer) having a thickness of 30 μm. In addition, an unstretched polypropylene film (ZK99S (product name), density 0.889 g / cm, manufactured by Toray Advanced Film Co., Ltd.) was applied as a second sealant layer onto the intermediate layer via the adhesive resin layer. 3 , thickness 100 μm) were bonded together.

[0110] Next, polypropylene was extruded onto the base layer to form an adhesive resin layer (first adhesive layer) having a thickness of 30 μm. In addition, an unstretched polypropylene film (ZK99S (product name), density 0.889 g / cm, manufactured by Toray Advanced Film Co., Ltd.) was laminated as a first sealant layer via the adhesive resin layer.3 100 μm) were laminated together. In this manner, a number of laminates were produced. The layer configuration of the resulting laminates was as follows: CPP / PP / OPP / printed layer / PP / evaporated layer / OPP / PP / CPP

[0111] The obtained laminate was used to produce a tube container as shown in Fig. 1. In this case, the laminate was first formed into a cylindrical shape to produce a body tube. At this time, the first sealant layer and the second sealant layer were heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of 3 seconds, and a sealing temperature of 170°C. Similarly, the second sealant layers were heat-sealed to each other under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of 3 seconds, and a sealing temperature of 170°C.

[0112] The head member was made of polypropylene by injection molding.

[0113] Next, the body tube and the head member were bonded together to prepare a tube container.

[0114] (Example 3-1) A laminate and a tube container were produced in the same manner as in Example 2-1, except that an unstretched polypropylene film (product name VM-CPP, thickness 25 μm, manufactured by Toray Film Processing Co., Ltd.) with a vapor deposition layer (barrier layer) was used as the intermediate layer.

[0115] (Example 3-2) A laminate and a tube container were produced in the same manner as in Example 2-2, except that an unstretched polypropylene film (product name VM-CPP, thickness 25 μm, manufactured by Toray Film Processing Co., Ltd.) with a vapor deposition layer (barrier layer) was used as the intermediate layer.

[0116] (Example 4-1) A laminate shown in Fig. 2C was produced by first preparing a stretched polypropylene film (FOS-BT (product name), thickness 20 µm, manufactured by Futamura Chemical Co., Ltd.) as a base layer.

[0117] Next, a urethane-based gravure ink (NEW-LP Super (product name) and others, manufactured by Toyo Ink Co., Ltd.) and a barrier coating agent containing silica (STRADER, manufactured by Sumitomo Chemical Co., Ltd.) were applied by gravure printing onto the base layer to a dry thickness of 1 μm, and then dried to form a printed layer.

[0118] Next, a urethane-based two-component curing adhesive (manufactured by Rock Paint Co., Ltd., base agent: RN-920, curing agent: HN-920) was applied onto the printed layer and dried to form an adhesive layer (second adhesive layer) with a thickness of 1 μm. In addition, an unstretched polypropylene film (manufactured by Toray Film Processing Co., Ltd., ZK99S (product name), density 0.9 g / cm) was applied onto the printed layer as a second sealant layer via this adhesive layer. 3 , thickness 100 μm) were bonded together.

[0119] Next, a urethane-based two-liquid curing adhesive (manufactured by Rock Paint, base agent: RN-920, curing agent: HN-920) was applied onto the substrate layer and dried to form an adhesive layer (first adhesive layer) with a thickness of 1 μm. In addition, an unstretched polypropylene film (manufactured by Toray Film Processing Co., Ltd., ZK99S (product name), density 0.889 g / cm) was applied onto the substrate layer as a first sealant layer via this adhesive layer. 3 100 μm) were laminated together. In this manner, a number of laminates were produced. The layer configuration of the resulting laminates was as follows: CPP / DL / OPP / printing layer (silica) / DL / CPP

[0120] The obtained laminate was used to produce a tube container as shown in Fig. 1. In this case, the laminate was first formed into a cylindrical shape to produce a body tube. At this time, the first sealant layer and the second sealant layer were heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C. Similarly, the second sealant layers were heat-sealed to each other under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C.

[0121] The head member was made of polypropylene by injection molding.

[0122] Next, the body tube and the head member were bonded together to prepare a tube container.

[0123] (Example 4-2) A laminate shown in Fig. 2C was produced by first preparing a stretched polypropylene film (FOS-BT (product name), thickness 20 µm, manufactured by Futamura Chemical Co., Ltd.) as a base layer.

[0124] Next, a urethane-based gravure ink (NEW-LP Super (product name) and others, manufactured by Toyo Ink Co., Ltd.) and a barrier coating agent containing silica (STRADER, manufactured by Sumitomo Chemical Co., Ltd.) were applied by gravure printing onto the vapor deposition layer to a dry thickness of 1 μm, and then dried to form a printed layer.

[0125] Next, polypropylene was extruded onto the printed layer to form an adhesive resin layer (second adhesive layer) having a thickness of 30 μm. In addition, an unstretched polypropylene film (ZK99S (product name), density 0.889 g / cm, manufactured by Toray Advanced Film Co., Ltd.) was applied as a second sealant layer onto the printed layer via the adhesive resin layer. 3 , thickness 100 μm) were bonded together.

[0126] Next, polypropylene was extruded onto the base layer to form an adhesive resin layer (first adhesive layer) having a thickness of 30 μm. In addition, an unstretched polypropylene film (ZK99S (product name), density 0.889 g / cm, manufactured by Toray Advanced Film Co., Ltd.) was applied as a first sealant layer onto the base layer via the adhesive resin layer. 3 100 μm) were laminated together. In this manner, a number of laminates were produced. The layer configuration of the resulting laminates was as follows: CPP / PP / OPP / printed layer (silica) / PP / CPP

[0127] The obtained laminate was used to produce a tube container as shown in Fig. 1. In this case, the laminate was first formed into a cylindrical shape to produce a body tube. At this time, the first sealant layer and the second sealant layer were heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C. Similarly, the second sealant layers were heat-sealed to each other under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C.

[0128] The head member was made of polypropylene by injection molding.

[0129] Next, the body tube and the head member were bonded together to prepare a tube container.

[0130] (Example 5-1) A laminate shown in Fig. 2B was produced by first preparing a stretched polypropylene film (FOS-BT (product name), thickness 20 µm, manufactured by Futamura Chemical Co., Ltd.) as a base layer.

[0131] Next, a urethane-based gravure ink (NEW-LP Super (product name) and others, manufactured by Toyo Ink Co., Ltd.) and a barrier coating agent containing silica (STRADER, manufactured by Sumitomo Chemical Co., Ltd.) were applied by gravure printing onto the base layer to a dry thickness of 1 μm, and then dried to form a printed layer.

[0132] Next, a urethane-based two-liquid curing adhesive (manufactured by Rock Paint Co., Ltd., base agent: RN-920, curing agent: HN-920) was applied onto the printed layer and dried to form an adhesive layer (second adhesive layer) with a thickness of 1 μm. In addition, a stretched polypropylene film (manufactured by DNP Technopack Co., Ltd., IB-OPP (product name), thickness 20 μm) provided with a vapor deposition layer (barrier layer) was bonded onto the printed layer as an intermediate layer via this adhesive layer.

[0133] Next, a urethane-based two-liquid curing adhesive (manufactured by Rock Paint, base agent: RN-920, curing agent: HN-920) was applied onto the intermediate layer and dried to form an adhesive layer (third adhesive layer) with a thickness of 1 μm. In addition, an unstretched polypropylene film (manufactured by Toray Film Processing Co., Ltd., ZK99S (product name), density 0.889 g / cm) was applied onto the intermediate layer as a second sealant layer via this adhesive layer. 3 , thickness 100 μm) were bonded together.

[0134] Next, a urethane-based two-component curing adhesive (manufactured by Rock Paint, base agent: RN-920, curing agent: HN-920) was applied onto the substrate layer and dried to form an adhesive layer (first adhesive layer) with a thickness of 1 μm. In addition, an unstretched polypropylene film (manufactured by Toray Film Processing Co., Ltd., ZK99S (product name), density 0.889 g / cm) was applied as a first sealant layer through this adhesive layer. 3 100 μm) were laminated together. In this manner, a number of laminates were produced. The layer configuration of the resulting laminates was as follows: CPP / DL / OPP / printed layer (silica) / DL / vapor deposition layer / OPP / DL / CPP

[0135] The obtained laminate was used to produce a tube container as shown in Fig. 1. In this case, the laminate was first formed into a cylindrical shape to produce a body tube. At this time, the first sealant layer and the second sealant layer were heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C. Similarly, the second sealant layers were heat-sealed to each other under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C.

[0136] The head member was made of polypropylene by injection molding.

[0137] Next, the body tube and the head member were bonded together to prepare a tube container.

[0138] (Example 5-2) A laminate shown in Fig. 2B was produced by first preparing a stretched polypropylene film (FOS-BT (product name), thickness 20 µm, manufactured by Futamura Chemical Co., Ltd.) as a base layer.

[0139] Next, a urethane-based gravure ink (NEW-LP Super (product name) and others, manufactured by Toyo Ink Co., Ltd.) and a barrier coating agent containing silica (STRADER, manufactured by Sumitomo Chemical Co., Ltd.) were applied by gravure printing onto the base layer to a dry thickness of 1 μm, and then dried to form a printed layer.

[0140] Next, polypropylene was extruded onto the printed layer to form an adhesive resin layer (second adhesive layer) having a thickness of 30 μm. In addition, a stretched polypropylene film (manufactured by DNP Technopack Co., Ltd., IB-OPP (product name), thickness 20 μm) provided with a vapor deposition layer (barrier layer) was bonded onto the printed layer as an intermediate layer via this adhesive resin layer.

[0141] Next, polypropylene was extruded onto the intermediate layer to form an adhesive resin layer (third adhesive layer) having a thickness of 30 μm. In addition, an unstretched polypropylene film (ZK99S (product name), density 0.889 g / cm, manufactured by Toray Advanced Film Co., Ltd.) was applied as a second sealant layer onto the intermediate layer via the adhesive resin layer. 3 , thickness 100 μm) were bonded together.

[0142] Next, polypropylene was extruded onto the base layer to form an adhesive resin layer (first adhesive layer) having a thickness of 30 μm. In addition, an unstretched polypropylene film (ZK99S (product name), density 0.889 g / cm, manufactured by Toray Advanced Film Co., Ltd.) was laminated as a first sealant layer via the adhesive resin layer. 3 100 μm) were laminated together. In this manner, a number of laminates were produced. The layer configuration of the resulting laminates was as follows: CPP / PP / OPP / printed layer (silica) / PP / vapor deposition layer / OPP / PP / CPP

[0143] The obtained laminate was used to produce a tube container as shown in Fig. 1. In this case, the laminate was first formed into a cylindrical shape to produce a body tube. At this time, the first sealant layer and the second sealant layer were heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C. Similarly, the second sealant layers were heat-sealed to each other under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C.

[0144] The head member was made of polypropylene by injection molding.

[0145] Next, the body tube and the head member were bonded together to prepare a tube container.

[0146] Comparative Example 1 A laminate shown in Fig. 2A was produced by first preparing a biaxially stretched polyethylene terephthalate film (manufactured by DNP Technopack Co., Ltd., IB-PET-WUB (product name), thickness 12 µm) provided with a deposition layer (barrier layer) as a base layer.

[0147] Next, a urethane gravure ink (NEW-LP Super (product name) manufactured by Toyo Ink Mfg. Co., Ltd., etc.) was applied by gravure printing onto the deposition layer so as to have a dry thickness of 1 μm, and then dried to form a printed layer.

[0148] Next, a urethane-based two-component curing adhesive (manufactured by Rock Paint Co., Ltd., base agent: RU-004, curing agent: H-1) was applied onto the printed layer and dried to form an adhesive layer (second adhesive layer) with a thickness of 3 μm. In addition, a milky white polyethylene film (manufactured by DNP Technopack Co., Ltd., SR-WN2 milky white (product name), density 0.946 g / cm) was applied onto the printed layer as a second sealant layer via this adhesive layer. 3 , thickness 130 μm) were bonded together.

[0149] Next, a urethane-based two-component curing adhesive (manufactured by Rock Paint, base agent: RU-004, curing agent: H-1) was applied onto the substrate layer and dried to form an adhesive layer (first adhesive layer) with a thickness of 3 μm. In addition, a polyethylene film containing an antistatic agent (manufactured by DNP Technopack Co., Ltd., SR-WN2 AS (product name), density 0.919 g / cm) was applied as a first sealant layer via this adhesive layer. 3 In this manner, a plurality of laminates were produced. The layer configuration of the obtained laminates is as follows: ASPEF / DL / PET / vapor deposition layer / printing layer / DL / milk white PEF In the above, "ASPEF" means polyethylene film with antistatic agent, and "milky white PEF" means milky white polyethylene film.

[0150] The obtained laminate was used to produce a tube container as shown in Fig. 1. In this case, the laminate was first formed into a cylindrical shape to produce a body tube. At this time, the first sealant layer and the second sealant layer were heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C. Similarly, the second sealant layers were heat-sealed to each other under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C.

[0151] A head member was produced by compression molding, and the body tube and the head member were bonded together to produce a tube container. The head member was made of polyethylene.

[0152] Comparative Example 2 A laminate shown in Fig. 2B was produced by first preparing a biaxially stretched polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., E5200 (product name), thickness 12 µm) as a base layer.

[0153] Next, a urethane gravure ink (NEW-LP Super (product name) manufactured by Toyo Ink Mfg. Co., Ltd., etc.) was applied onto the base layer by gravure printing so as to have a dry thickness of 1 μm, and then dried to form a printed layer.

[0154] Next, a urethane-based two-liquid curing adhesive (manufactured by Rock Paint Co., Ltd., base agent: RU-080, curing agent: H-5) was applied onto the printed layer and dried to form an adhesive layer (second adhesive layer) with a thickness of 3 μm. In addition, a biaxially oriented polyethylene terephthalate film (manufactured by Toray Advanced Film Co., Ltd., BR-PET 1312 (product name), thickness 12 μm) with a vapor deposition layer (barrier layer) provided thereon was bonded onto the printed layer via this adhesive layer.

[0155] Next, a urethane-based two-liquid curing adhesive (manufactured by Rock Paint Co., Ltd., base agent: RU-080, curing agent: H-5) was applied onto the intermediate layer and dried to form an adhesive layer (third adhesive layer) with a thickness of 3 μm. In addition, a polyethylene film (manufactured by DNP Technopack Co., Ltd., SR-WN2 (product name), density 0.919 g / cm) was applied onto the intermediate layer as a second sealant layer via this adhesive layer. 3 , thickness 180 μm) were bonded together.

[0156] Next, a urethane-based two-component curing adhesive (manufactured by Rock Paint Co., Ltd., base agent: RU-080, curing agent: H-5) was applied onto the substrate layer and dried to form an adhesive layer (first adhesive layer) with a thickness of 3 μm. In addition, a polyethylene film containing an antistatic agent (manufactured by DNP Technopack Co., Ltd., SR-WN2 AS (product name), density 0.919 g / cm) was applied as a first sealant layer via this adhesive layer. 3 In this manner, a plurality of laminates were produced. The layer configuration of the obtained laminates is as follows: ASPEF / DL / PET / printed layer / DL / evaporated layer / PET / DL / PEF In the above, "PE" means polyethylene film.

[0157] The obtained laminate was used to produce a tube container as shown in Fig. 1. In this case, the laminate was first formed into a cylindrical shape to produce a body tube. At this time, the first sealant layer and the second sealant layer were heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of 3 seconds, and a sealing temperature of 170°C. Similarly, the second sealant layers were heat-sealed to each other under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of 3 seconds, and a sealing temperature of 170°C.

[0158] A head member was produced by compression molding, and the body tube and the head member were bonded together to produce a tube container. The head member was made of polyethylene.

[0159] Comparative Example 3 First, a uniaxially stretched high-density polyethylene film (Hibron SMKQW (product name), thickness 25 μm, manufactured by Tokyo Ink Co., Ltd.) was prepared as a substrate layer.

[0160] Next, a urethane gravure ink (NEW-LP Super (product name) manufactured by Toyo Ink Mfg. Co., Ltd., etc.) was applied onto the base layer by gravure printing so as to have a dry thickness of 1 μm, and then dried to form a printed layer.

[0161] A laminate was also produced as the second sealant layer by first preparing a polyethylene film (thickness 75 μm) containing an ethylene-vinyl alcohol copolymer (EVOH).

[0162] Next, polyethylene was extruded onto the polyethylene film to form an adhesive resin layer having a thickness of 30 μm. A milky white polyethylene film (SR-WN2 (product name), thickness 100 μm, manufactured by DNP Technopack Co., Ltd.) was bonded onto the polyethylene film via the adhesive resin layer. In this way, a laminate (density 0.946 g / cm 3 ) was formed as a second sealant layer. 3 ) was prepared.

[0163] Next, an adhesive resin layer having a thickness of 25 μm was formed by extruding polyethylene onto the polyethylene film, and the base layer having the printed layer formed thereon was laminated via this adhesive resin layer.

[0164] Next, polyethylene was extruded onto the printed layer to form an adhesive resin layer having a thickness of 25 μm. A polyethylene film containing an antistatic agent (SP100 AS (product name), density 0.917 g / cm, manufactured by DNP Technopack Co., Ltd.) was then applied as a first sealant layer via the adhesive resin layer. 3 , 80 μm) were laminated together. In this manner, a number of laminates were produced. The layer configuration of the resulting laminates was as follows: ASPEF / PE / printing layer / HDPEF / PE / EVOH·PEF / PE / milk white PEF In the above, "PE" means polyethylene as an adhesive layer, "HDPEF" means uniaxially oriented high density polyethylene film, and "EVOH·PEF" means polyethylene film containing ethylene-vinyl alcohol copolymer.

[0165] The obtained laminate was used to produce a tube container as shown in Fig. 1. In this case, the laminate was first formed into a cylindrical shape to produce a body tube. At this time, the first sealant layer and the second sealant layer were heat-sealed under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C. Similarly, the second sealant layers were heat-sealed to each other under sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of about 1 second, and a sealing temperature of 170°C.

[0166] In addition, a head member was produced by compression molding, and a tube container was produced by bonding the body tube and the head member together. High density polyethylene was used as the material for the head member.

[0167] <Adhesive strength evaluation> The body seal and bottom seal of the body tube of the tube container were cut into strips of 15 mm width to prepare samples. The adhesive strength of the body seal (adhesive strength between the first sealant layer and the second sealant layer) and the adhesive strength of the bottom seal (adhesive strength between the second sealant layers) of these samples were measured. The measurements were performed in accordance with JIS K6854-2 using a tensile tester (STA-1150, manufactured by Orientec Co., Ltd.). The samples were pulled at a speed of 300 mm / min, and the average value of the tensile stress was taken as the adhesive strength.

[0168] <Heat shrinkage evaluation> Using a laminate different from the laminate used to prepare the tube container, the first sealant layer and the second sealant layer were heat-sealed under the sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of 3 seconds, and a sealing temperature of 150°C. Then, the heat shrinkage rate of the first sealant layer and the heat shrinkage rate of the second sealant layer were measured. In addition, a film to be used for the base layer was prepared, and the base layers were heat-sealed under the sealing conditions of a sealing pressure of 0.1 MPa, a sealing time of 3 seconds, and a sealing temperature of 170°C. Then, the heat shrinkage rate of the base layer was measured.

[0169] <Hot filling test> The prepared tube container was filled with the contents (130 g of Imuraya seasoning tube) at 70° C. Next, the bottom seal was formed by ultrasonic sealing. Then, (1) appearance defects such as wrinkles after sealing and (2) seal strength of the sealed portion were confirmed.

[0170] <Retort sterilization test> The manufactured tube container was filled with crushed red bean paste as the contents. Next, the bottom seal part was formed by ultrasonic sealing. Then, it was subjected to pressure heating sterilization in a steam retort at a temperature of 120°C, a pressure of 1.5×105 Pa for 30 minutes. After cooling, the tube container was taken out from the retort, and the presence or absence of damage to the tube container was confirmed. Specifically, (3) the presence or absence of thermal deformation in the head member and the body tube, (4) the presence or absence of peeling at the joint of the head member and the body tube, and (5) the presence or absence of sealing defects at the body seal part and the bottom seal part were confirmed.

[0171] <Pressure Resistance Test> Each tube container was filled with 180 g of the contents. As the contents, LUX Super Rich Treatment (manufactured by Unilever Japan Customer Marketing Co., Ltd., trade name) was used. Then, a load of 60 kgf was applied to each tube container for 1 minute. After that, the presence or absence of content leakage was confirmed.

[0172] <Judgment of Monomaterial according to CEFLEX Standard> Judgment of monomaterial was carried out in accordance with the guidelines of CEFLEX.

[0173] The above results are shown in Tables 1 to 5.

[0174]

Table 1

[0175]

Table 2

[0176]

Table 3

[0177]

Table 4

[0178] [Table 5]

[0179] In addition, in Table 3 above, the "Not possible" in the column "Heat shrinkage rate of base layer (%) 170°C" means that the heat shrinkage rate could not be measured because the base layer could not be peeled off from the heat-sealing member when heat-sealing.

[0180] In Table 4, "good" in the "hot filling" column means that all of the above (1) and (2) were good. "bad" in the "hot filling" column means that the above (1) and (2) were not good for at least one tube container.

[0181] In Table 4, "good" in the "retort sterilization" column means that all of the above (3) to (5) were good. "bad" in the "retort sterilization" column means that the above (3) to (5) were not good for at least one tube container.

[0182] In addition, in Table 4, "good" in the "Pressure test" column means that no leakage of contents was confirmed. "Bad" in the "Pressure test" column means that leakage of contents was confirmed.

[0183] In addition, in Table 5 above, "good" in the "mono-material" column means that the mono-material was judged to be good in accordance with the CEFLEX guidelines. "bad" in the "mono-material" column means that the mono-material was judged to be bad in accordance with the CEFLEX guidelines. Note that these are judgments from the perspective of mono-polyethylene, not mono-olefin.

[0184] As a result, all the results were favorable.

[0185] It is also possible to combine the multiple components disclosed in the above embodiments as necessary, or to delete some of the components disclosed in the above embodiments. [Explanation of symbols]

[0186] 10 Laminate 11 First sealant layer 12 Second sealant layer 13 Base material layer 14a 1st adhesive layer 14b Second adhesive layer 16 Printing layer 17 Barrier Layer 40 Tube Container 40A Tube container with cap 41 Body tube 42 one end 43 Head parts 49 Cap 101 Exterior 102 Inside

Claims

1. A first sealant layer forming an outer surface; A second sealant layer constituting an inner surface; a base layer provided between the first sealant layer and the second sealant layer; a barrier layer provided between the first sealant layer and the base layer, The first sealant layer and the second sealant layer each have a density of 0.88 g / cm ３ 0.90g / cm or more ３ The unstretched polypropylene resin is The difference between the density of the unstretched polypropylene resin of the first sealant layer and the density of the unstretched polypropylene resin of the second sealant layer is 0.10 g / cm ３ is less than The base layer is a stretched polypropylene film, the barrier layer is a vapor-deposited layer made of an inorganic oxide, When the first sealant layer and the second sealant layer are heat-sealed, the adhesive strength between the first sealant layer and the second sealant layer is 5 N / 15 mm or more; When the second sealant layers are heat-sealed to each other, the adhesive strength between the second sealant layers is 5 N / 15 mm or more; When the first sealant layer and the second sealant layer are heat-sealed, the heat shrinkage rate of the first sealant layer and the heat shrinkage rate of the second sealant layer are each 5.0% or less; A laminate, wherein when the first sealant layer and the second sealant layer are heat-sealed, the heat shrinkage rate of the base layer is 25% or less.

2. A first sealant layer forming an outer surface; A second sealant layer constituting an inner surface; a base layer provided between the first sealant layer and the second sealant layer; a printed layer provided on a surface of the base layer facing the second sealant layer, The first sealant layer and the second sealant layer each have a density of 0.88 g / cm ３ 0.90g / cm or more ３ The unstretched polypropylene resin is The difference between the density of the unstretched polypropylene resin of the first sealant layer and the density of the unstretched polypropylene resin of the second sealant layer is 0.10 g / cm ３ is less than The base layer is a stretched polypropylene film, The printing layer includes silica, When the first sealant layer and the second sealant layer are heat-sealed, the adhesive strength between the first sealant layer and the second sealant layer is 5 N / 15 mm or more; When the second sealant layers are heat-sealed to each other, the adhesive strength between the second sealant layers is 5 N / 15 mm or more; When the first sealant layer and the second sealant layer are heat-sealed, a heat shrinkage rate of the first sealant layer and a heat shrinkage rate of the second sealant layer are 5.0% or less; A laminate, wherein when the first sealant layer and the second sealant layer are heat-sealed, the heat shrinkage rate of the base layer is 25% or less.

3. The laminate according to claim 1 , wherein a heat shrinkage rate of the first sealant layer and a heat shrinkage rate of the second sealant layer are each greater than a heat shrinkage rate of the base material layer.

4. The laminate according to claim 1 , wherein the density of the unstretched polypropylene resin of the first sealant layer is equal to the density of the unstretched polypropylene resin of the second sealant layer.

5. The laminate of claim 1 , wherein the first sealant layer has a thickness equal to or less than a thickness of the second sealant layer.

6. 10. The laminate of claim 1, wherein at least one of the first sealant layer, the substrate layer, and the second sealant layer comprises biomass-derived polypropylene and / or recycled polypropylene.

7. 2. The laminate of claim 1, further comprising a first adhesive layer provided between the first sealant layer and the base layer, and a second adhesive layer provided between the base layer and the second sealant layer.

8. The laminate according to claim 1 , further comprising a printed layer provided on the base layer or the barrier layer.

9. At least one of the first sealant layer and the second sealant layer has a first layer, a second layer, a third layer, a fourth layer, and a fifth layer arranged in this order from the outer surface side to the inner surface side, the first layer comprises polypropylene; the second layer includes an adhesive resin; the third layer contains a resin having a barrier property, the fourth layer includes an adhesive resin; The laminate of claim 1 , wherein the fifth layer comprises polypropylene.

10. 2. The laminate according to claim 1, wherein at least 90% is a polypropylene-based material and does not contain polyethylene terephthalate or aluminum foil.

11. In a tube container, A body tube in which opposing edges of the laminate according to any one of claims 1 to 10 are overlapped and joined to each other; a head member joined to one end of the body tube.

12. The tube container of claim 11 , wherein the head member comprises polypropylene.

13. In a tube container with a cap, The tube container according to claim 11 ; A capped tube container comprising: a cap attached to the head member.

14. 14. The capped tube container of claim 13, wherein the cap comprises polypropylene.

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