Laminate sheet for forming tube container body, tube container and capped tube container

Abstract

To provide a laminate sheet for forming a tube container body that allows for easily squeezing a content, a tube container and a capped tube container.SOLUTION: A laminate sheet 50 in the present disclosure is for forming a body of a tube container. The laminate sheet 50 comprises at least a first sealant layer 51, a base layer 52, an intermediate layer 54 and a second sealant layer 57, in the order from the outside. The laminate sheet 50 has a thickness of 260 μm or greater and 400 μm or smaller, the intermediate layer 54 has a thickness of 60 μm or greater and 80 μm or smaller, the intermediate layer 54 contains polyethylene as a principal component, and the laminate sheet 50 has, in one direction, a loop stiffness value of 1.10 N / 15 mm or greater and 2.50 N / 15 mm or smaller.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a laminated sheet for forming a body portion of a tube container, a tube container, and a tube container with a cap. [Background technology]

[0002] BACKGROUND ART Conventionally, a laminated tube container has been known as a tube container, which is composed of a laminated sheet for forming a body portion and a head member including a mouth portion (for example, Patent Document 1).

[0003] The laminated sheet for forming the body of a tube container disclosed in the examples of Patent Document 1 is composed of, from the outside, a first sealant layer, a base layer, an intermediate layer, and a second sealant layer, and the intermediate layer is provided with a barrier layer or the like that has barrier properties against oxygen gas and the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-223934 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, laminated sheets for forming the body of tube containers are required to make it easier to squeeze out the contents inside the tube containers.

[0006] The present disclosure has been made in consideration of such problems, and aims to provide a laminated sheet for forming the body of a tube container, a tube container, and a tube container with a cap that make it easy to squeeze out the contents. [Means for solving the problem]

[0007] The present invention was made in light of these circumstances, and its purpose is to provide a laminated sheet for forming the body of a tube container, a tube container, and a tube container with a cap, which make it easier to squeeze out the contents by reducing the total thickness of the entire laminated sheet while maintaining the strength (firmness) of the body of the tube container.

[0008] That is, the laminate sheet for forming the body of a tube container according to one embodiment is a laminate sheet for forming the body of a tube container, and the laminate sheet comprises, from the outside in, at least a first sealant layer, a base layer, an intermediate layer, and a second sealant layer, the thickness of the laminate sheet is 260 μm or more and 400 μm or less, the thickness of the intermediate layer is 60 μm or more and 80 μm or less, the intermediate layer contains polyethylene as a main component, and the loop stiffness value in one direction of the laminate sheet is 1.10 N / 15 mm or more and 2.50 N / 15 mm or less.

[0009] In addition, a tube container according to one embodiment includes a body tube formed by overlapping and joining opposing edge portions at both ends of a laminated sheet for forming a tube container body according to one embodiment, and a head member joined to one end of the body tube.

[0010] A capped tube container according to one embodiment includes the tube container according to one embodiment and a cap attached to the head member. [Effects of the Invention]

[0011] According to the present disclosure, it is possible to provide a laminated sheet for forming the body of a tube container, a tube container, and a tube container with a cap that make it easy to squeeze out the contents of the tube container. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a partial vertical cross-sectional view showing a tube container with a cap according to this embodiment filled with contents. [Figure 2]FIG. 2 is a cross-sectional view showing an example of the layer structure of the laminated sheet for forming the body portion of a tube container according to this embodiment. [Figure 3] FIG. 3 is a cross-sectional view showing another example of the layer structure of the laminated sheet for forming the body portion of a tube container according to this embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing another example of the layer structure of the laminated sheet for forming the body portion of a tube container according to this embodiment. [Figure 5] FIG. 5 is a schematic diagram showing a method for manufacturing a tube container according to this embodiment. [Figure 6] FIG. 6 is a partial vertical cross-sectional view showing the method for manufacturing a tube container according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment will be described below with reference to the drawings. Figures 1 to 6 are diagrams showing one embodiment. Each of the drawings shown below is a schematic illustration. Furthermore, the numerical values such as dimensions of each member and the names of materials described in this specification are examples of an embodiment, and are not limited to these, and can be selected and used as appropriate.

[0014] First, referring to FIG. 1, a capped tube container 10A produced using a laminated sheet 50 for forming a tube container body according to this embodiment will be described.

[0015] The capped tube container 10A has a cylindrical body including a laminated sheet of a body tube, and a shoulder 41 and a mouth 42 made by applying resin to the cylindrical body by compression molding. A cap 20 is attached to the mouth of the tube container 10.

[0016] As shown in FIG. 1, a capped tube container 10A according to this embodiment includes a tube container 10 and a cap 20 attached to a head member 40 of the tube container 10, which will be described later.

[0017] 1, the head member 40 has a shoulder portion 41 and a mouth portion 42. Of these, the mouth portion 42 is adapted to have the cap 20 attached thereto.

[0018] As will be described later, the head member 40 is formed by, for example, compression molding, and is made of, for example, a resin material such as high density polyethylene (HDPE).

[0019] Next, the body tube 30 of the tube container 10 will be described. The body tube 30 shown in Fig. 1 has a generally cylindrical shape. This body tube 30 is made of a laminated laminate sheet 50 for forming the body of a tube container (see Figs. 2 to 4). The body tube 30 also has a body seal portion 32 formed by joining end portions 35 of the laminate sheet 50 together along the longitudinal direction.

[0020] A head member 40 is joined to one end 31 of the body tube 30. A bottom seal 34 is formed at the other end 33 of the body tube 30, where two laminated sheets 50 are joined together. This bottom seal 34 is formed by joining two laminated sheets 50 together near an opening 50B (see FIG. 5) formed at the other end of the body tube 30, after an appropriate amount of content C, such as an alcohol-containing cleanser, sunscreen, toothpaste, hand cream, treatment, or other product, has been filled into the opening 50B.

[0021] Next, the layer structure of the laminate sheet 50 for forming the body portion of a tube container will be described. FIGS. 2 and 3 show an example of the layer structure of the laminate sheet 50 constituting the body tube 30. As shown in FIG. 2, the laminate sheet 50 includes, in order from the outer surface 501 to the inner surface 502, a first sealant layer 51, a base layer 52, an intermediate layer 54, and a second sealant layer 57. The intermediate layer 54 contains polyethylene as a main component. The laminate sheet 50 may further include a printed layer 55 provided on one surface of the base layer 52. Furthermore, as shown in FIG. 3, the laminate sheet 50 may further include a barrier layer 56 disposed between the base layer 52 and the second sealant layer 57.

[0022] 2, the laminate sheet 50 includes, in this order from the outer surface 501 to the inner surface 502, a first sealant layer 51, a first adhesive layer 53a, a base material layer 52, a printed layer 55, a second adhesive layer 53b, an intermediate layer 54, a third adhesive layer 53c, and a second sealant layer 57. Although not shown, the first sealant layer 51 and the second sealant layer 57 may each include multiple layers.

[0023] 3, the laminate sheet 50 includes, in this order from the outer surface 501 to the inner surface 502, a first sealant layer 51, a first adhesive layer 53a, a base material layer 52, a printing layer 55, a second adhesive layer 53b, an intermediate layer 54, a third adhesive layer 53c, a barrier layer 56, a fourth adhesive layer 53d, and a second sealant layer 57. Although not shown, the first sealant layer 51 and the second sealant layer 57 may each include multiple layers.

[0024] Here, the laminated sheet 50 shown in Figs. 2 and 3 can be suitably used for the body tube 30 in which laminated sheets 50 are laminated together.

[0025] In this specification, the terms "outside" and "inside" refer to the "outside" and "inside" when the tube container 10 is produced using the laminated sheet 50 of the body tube.

[0026] The laminated sheet 50 according to this embodiment must have a loop stiffness value of 1.10 N / 15 mm or more and 2.50 N / 15 mm or less in one direction of the laminated sheet 50, measured under the following measurement conditions.

[0027] Here, the conditions for measuring the loop stiffness value are explained. First, the laminated sheet 50 used for the body portion was cut near the center in the height direction (D1) of the tube container, and three strips 15 mm wide and 150 mm long were cut out to create strip-shaped film. Next, the strip-shaped film was set so that its longitudinal direction coincided with the direction of the object to be measured, forming a loop. At this time, the loop length was 70 mm. Then, both ends of the measurement sample were clamped and fixed with clips, and a circular loop with a loop length of 70 mm was formed at the center of the longitudinal direction. The obtained circular loop was pressed from the opposite side of the clip, and the load required to press down to 10 mm was taken as the loop stiffness value. Here, the crushing distance was 5 mm, the compression speed was 3.5 mm / sec, and the load range was 5000 mN.

[0028] By setting the loop stiffness value within the range of 1.10 N / 15 mm or more and 2.50 N / 15 mm or less, the laminate sheet 50 of the present disclosure can exhibit excellent bending resistance and high mechanical strength. Furthermore, a tube container equipped with the laminate sheet 50 of the present disclosure can also extrude its contents to the end at the bent portion of its shoulder, etc.

[0029] Further, from the same viewpoint, the thickness of the laminated sheet 50 is 260 μm or more and 400 μm or less, and the thickness of the intermediate layer 54 is 60 μm or more and 80 μm or less.

[0030] Next, each layer of the laminated sheet 50 of the body tube will be described.

[0031] The intermediate layer 54 has the function of supporting the laminated sheet 50 that constitutes the body tube, and can be made of any material that can support the laminated sheet 50 and contains polyethylene as its main component, without any particular restrictions.

[0032] The intermediate layer 54 according to the present embodiment preferably has a loop stiffness value of 0.60 N / 15 mm or more and 1.60 N / 15 mm or less in one direction of the intermediate layer 54, as measured under the following measurement conditions.

[0033] The conditions for measuring the loop stiffness value are now described. First, the intermediate layer 54 was cut near the center in the height direction D1 of the tube container, and three strips each 15 mm wide and 150 mm long were cut out to create a strip of film. Next, the longitudinal direction of the strip of film was aligned with the direction of the object to be measured, forming a loop. The loop length was 70 mm. Then, both ends of the measurement sample were clamped and fixed with clips, and a circular loop with a loop length of 70 mm was formed in the center of the length. The resulting circular loop was pressed from the opposite side of the clip, and the load required to compress the loop to 10 mm was taken as the loop stiffness value. The compression distance was 5 mm, the compression speed was 3.5 mm / sec, and the load range was 5000 mN.

[0034] By setting the loop stiffness value in one direction within the range of 0.6 N / 15 mm or more and 1.6 N / 15 mm or less, the intermediate layer 54 of the present disclosure can exhibit excellent flex resistance and high mechanical strength. Furthermore, a tube container including the intermediate layer 54 of the present disclosure can also push out the contents to the end at the bent portion of the shoulder, etc.

[0035] In this embodiment, the term "main component" means that the intermediate layer 54 may be formed using only polyethylene, or may contain various resins and additives other than polyethylene, as long as the properties are not impaired.

[0036] Examples of materials containing polyethylene as a main component used in intermediate layer 54 of laminated sheet 50 constituting the trunk tube include resin compositions containing high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), or linear low-density polyethylene (LLDPE) as a main component, and acid-modified polyethylenes obtained by modifying polyethylene resins with acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, or other unsaturated carboxylic acids.

[0037] Here, high density polyethylene is defined as polyethylene with a density of 0.941 g / cm 3 or more, preferably 0.941 g / cm 3 More than 0.965g / cm 3 It refers to polyethylene obtained by polymerizing ethylene using a low-pressure polymerization method (gas phase polymerization using a Ziegler-Natta catalyst or liquid phase polymerization using a metallocene catalyst). 3 More than 0.942g / cm 3 Low-density polyethylene refers to polyethylene obtained by polymerizing ethylene having a density of less than 0.93 g / cm. 3 less than 0.91 g / cm 3 More than 0.93g / cm 3 The linear low-density polyethylene has a density of less than 0.93 g / cm and is obtained by polymerizing ethylene by high-pressure polymerization. 3 and preferably has a density of less than 0.91 g / cm 3 More than 0.93g / cm 3 It refers to a copolymer obtained by polymerizing ethylene and a small amount of α-olefins by a low-pressure polymerization method. In this embodiment, the density of the polyethylene of the intermediate layer 54 constituting the tube container is 0.91 g / cm 3 It is preferable that the density is 0.930 g / cm or more. 3 More preferably, it is 0.941 g / cm or more. 3This makes it possible to improve the bending resistance and mechanical strength compared to conventional methods. The density of polyethylene is a value measured according to the method specified in Method A of JIS K7112-1980 after annealing as specified in JIS K6760-1995.

[0038] The melt flow rate (MFR) of the polyethylene is preferably 1 g / 10 min or more and 30 g / 10 min or less, more preferably 2.0 g / 10 min or more and 20.0 g / 10 min or less. The melt flow rate is a value measured by Method A under conditions of a temperature of 190°C and a load of 21.18 N in accordance with the method specified in JIS K7210-1995. The MFR of linear low-density polyethylene may be lower than the MFR of low-density polyethylene.

[0039] The polyethylene may be derived from fossil fuels, but biomass-derived polyethylene, known as a carbon-neutral material, may also be used to reduce environmental impact. The polyethylene described above is used in the first sealant layer 51 and second sealant layer 57, described below, and the aforementioned intermediate layer 54. Because it accounts for a large mass proportion of the laminate sheet 50, manufacturing the laminate sheet 50 using biomass-derived polyethylene can significantly reduce the amount of fossil fuel used for the entire tube container, thereby reducing environmental impact. In particular, using the aforementioned polyethylene in the intermediate layer 54 can increase the biomass content without affecting slipperiness during manufacturing. Furthermore, biomass-derived polyethylene has a higher haze value than fossil fuel-derived polyethylene. When irradiated with light from the outside of the tube container, the haze is 90% or more, and the high reflectivity allows the tube container to have a white, opaque appearance without the addition of colorants to shield the contents from the outside. Furthermore, the first sealant layer 51, the second sealant layer 57 and the intermediate layer 54 that constitute the laminated sheet 50 are comparable in terms of physical properties such as mechanical characteristics to those produced from raw materials obtained from conventional fossil fuels, and therefore can replace the conventional first sealant layer 51, the second sealant layer 57 and the intermediate layer 54.

[0040] From the perspective of reducing environmental impact, it is preferable to use only biomass-derived polyethylene. However, considering production costs and other factors, a blend of fossil fuel-derived polyethylene and biomass-derived polyethylene may also be used. Here, biomass-derived polyethylene is a monomer polymer containing biomass-derived ethylene. Because biomass-derived ethylene is used as the raw material monomer, the polymerized polyethylene is biomass-derived. The content of biomass-derived ethylene in the raw material monomer does not need to be 100% by mass, but is preferably 50% by mass or more, and more preferably 80% by mass or more. The raw material monomer may contain fossil fuel-derived ethylene or an α-olefin monomer such as butylene, hexene, or octene. Even in such a case, the resulting polymer is called biomass polyethylene. When biomass-derived polyethylene is used, it may contain two or more polyolefins with different biomass contents. Furthermore, when blending fossil fuel-derived polyethylene and biomass-derived polyethylene, the mixing method is not particularly limited, and dry blending or melt blending may be used. When the two are mixed, the mixing ratio of the fossil fuel-derived polyethylene to the biomass-derived polyethylene is preferably 1:9 to 9:1, more preferably 2:8 to 8:2, in mass ratio.

[0041] For example, biomass-derived ethylene can be produced using biomass-derived ethanol as a raw material. In particular, it is preferable to use biomass-derived fermented ethanol obtained from plant raw materials. The plant raw material is not particularly limited, and conventionally known plants can be used. Examples include corn, sugarcane, beet, and manioc.

[0042] In this embodiment, biomass-derived fermented ethanol refers to ethanol produced by contacting a culture solution containing a carbon source obtained from plant raw materials with an ethanol-producing microorganism or a product derived from its disruption, followed by purification. Ethanol can be purified from the culture solution by conventional methods such as distillation, membrane separation, and extraction. Examples of methods include adding benzene, cyclohexane, or the like and removing water by azeotropy or membrane separation.

[0043] In this embodiment, a suitable example of biomass-derived high-density polyethylene is SHA7260 (density: 0.955 g / cm) manufactured by Braskem. 3 , MFR: 20g / 10min, biomass content 94%, SHC7260 (density: 0.959g / cm 3 , MFR: 7.2 g / 10 min, biomass content 94%), SHD7255LSL (density: 0.954 g / cm 3 , MFR: 4.5g / 10min, biomass content 94%, SGE7252 (density: 0.953g / cm 3 , MFR: 2.2 g / 10 min, biomass content 96%).

[0044] The biomass ratio is the value of the C14 content obtained by a radiocarbon (C14) measurement method in accordance with ASTM-D6866. Atmospheric carbon dioxide contains a certain proportion of C14 (105.5 pMC), and it is known that the C14 content in plants that grow by absorbing atmospheric carbon dioxide, such as corn, is also approximately 105.5 pMC. It is also known that fossil fuels contain very little C14. Therefore, the proportion of biomass-derived carbon can be calculated by measuring the proportion of C14 in the total carbon atoms in the polyester. In the present invention, when the C14 content in the polyester is defined as PC14, the biomass-derived carbon content, Pbio, can be calculated as follows: Pbio(%) = PC14 / 105.5 × 100

[0045] As long as the film used for the intermediate layer 54 of the laminate sheet 50 of the tube container body contains the above-mentioned polyethylene as a main component, various additives may be added to the film as long as the properties of the film are not impaired. Examples of additives that can be added include plasticizers, UV stabilizers, matting agents, deodorizers, flame retardants, weathering agents, antistatic agents, thread friction reducers, slip agents, mold release agents, antioxidants, ion exchange agents, and coloring pigments. These additives are preferably added in an amount of 0.5% by mass to 20% by mass, more preferably 1% by mass to 10% by mass, based on the total resin composition.

[0046] In this embodiment, suitable additives include, for example, milky white pigments, and other additives may be added arbitrarily to color the laminate sheet 50 like milky white polyethylene. By using milky white polyethylene for the intermediate layer 54, the glossiness of the laminate sheet 50 can be enhanced.

[0047] The intermediate layer 54 can be prepared, for example, by preparing a resin composition using one or more of the above resins as the main component, to which desired additives are optionally added, and then using the resin composition prepared above, a film can be produced using, for example, a T-die method, an inflation method, or other molding method.

[0048] The material that forms the first sealant layer 51 is a material that melts and fuses when heated.

[0049] The first sealant layer 51 can be, for example, a polyolefin film. The inclusion of polyolefin in the first sealant layer 51 improves the bonding strength between the first sealant layer 51 and the second sealant layer 57 when they are bonded together. Specifically, the first sealant layer 51 can be, for example, a polyethylene film, a polypropylene film, an acid-modified polyolefin resin film obtained by modifying a polyolefin resin such as polyethylene or polypropylene with acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, or other unsaturated carboxylic acid, a polyvinyl acetate resin film, a polyester resin film, a polystyrene resin film, or a film made of one or more of other resins such as polyacrylonitrile, saturated polyester, or polyvinyl alcohol. When the first sealant layer 51 contains polyethylene, the polyethylene may be biomass-derived polyethylene.

[0050] It is preferable that the first sealant layer 51 contains polyethylene. When the first sealant layer 51 contains polyethylene, the bonding strength between the first sealant layer 51 and the second sealant layer 57 can be more effectively improved when the first sealant layer 51 and the second sealant layer 57 are bonded to each other.

[0051] The first sealant layer 51 can be prepared, for example, by preparing a resin composition using one or more of the above resins as the main component, to which desired additives are optionally added, and then using the resin composition prepared above, a film can be produced using, for example, a T-die method, an inflation method, or other molding method.

[0052] Furthermore, various additives can be added to the material constituting the first sealant layer 51 during or after its production, as long as the additives do not impair the properties of the material. Examples of additives include antistatic agents.

[0053] In this embodiment, the thickness of the first sealant layer 51 is preferably 50 μm or more and 250 μm or less.

[0054] The first sealant layer 51 may be a single layer or may have multiple layers, and the multiple layers may be made of the same material as the single layer.

[0055] The first sealant layer 51 has an additional protective layer on its outer surface, which improves scratch resistance and reduces the coefficient of friction of the outer surface of the cylindrical body of the tube container.

[0056] When a picture print is present on an inner surface than the protective layer, the protective layer is preferably made of a see-through layer so that the picture print can be seen from the outside.

[0057] The substrate layer 52 is a layer that supports, for example, the first sealant layer 51 and the second sealant layer 57 and increases the strength of the entire laminate sheet 50. Materials that can be used to form the substrate layer 52 include, for example, films or sheets of polyester resins, polyamide resins, polyaramid resins, polyolefin resins, polycarbonate resins, polyacetal resins, fluorine-based resins, and other tough resins. As an example, the substrate layer 52 may contain polyethylene terephthalate. When the substrate layer 52 contains polyethylene terephthalate, the polyethylene terephthalate may be biomass-derived polyethylene terephthalate.

[0058] The resin film or sheet may be an unstretched film or a uniaxially or biaxially stretched film. Among these, biaxially stretched polyester resin films are preferred in this embodiment because they have excellent film strength (flexibility). Furthermore, biaxially stretched polyester resin films are also preferred because they are suitable for printing.

[0059] The base layer 52 may also contain paper. In this case, the paper may be bleached paper or unbleached paper. The basis weight of the paper may be, for example, 50 g / m 2 More than 200g / m 2 The base material layer 52 may contain paper, which can reduce the amount of resin used in the tube container 10. Furthermore, the base material layer 52 containing paper can impart a texture and feel to the tube container 10 that is different from that of a tube container 10 whose base material layer 52 is made only of resin.

[0060] In this embodiment, the thickness of the base layer 52 is preferably 10 μm or more and 25 μm or less.

[0061] A material that melts and fuses when heated is used as the material for the second sealant layer 57. The material for the second sealant layer may be the same as the material for the first sealant layer described above.

[0062] The second sealant layer 57 may be a single layer or may have multiple layers, and the multiple layers may be made of the same material as the single layer.

[0063] In this embodiment, the thickness of the second sealant layer 57 is preferably 50 μm or more and 250 μm or less.

[0064] Adhesive layers such as the first adhesive layer 53a, the second adhesive layer 53b, the third adhesive layer 53c, and the fourth adhesive layer 53d are layers for bonding together the first sealant layer 51, the base material layer 52, the intermediate layer 54, the barrier layer 56, the second sealant layer 57, etc. The material constituting these adhesive layers can be appropriately selected depending on the resin constituting the layers to be bonded.

[0065] As the adhesive layer, for example, anchor coating agents such as isocyanate-based (urethane-based), polyethyleneimine-based, polybutadiene-based, and organic titanium-based, or polyurethane-based, polyacrylic-based, polyester-based, epoxy-based, polyvinyl acetate-based, cellulose-based, and other laminating adhesives can be used as desired.

[0066] Furthermore, for example, polyethylene, polypropylene, polyethylene, ethylene-vinyl alcohol, ethylene-methacrylic acid copolymer (EMAA), ethylene-acrylic acid copolymer, ionomer, maleic anhydride modified polyolefin resin, etc. can be suitably used as the adhesive layer.

[0067] In this embodiment, the thickness of the adhesive layer is preferably 3 μm or more and 60 μm or less.

[0068] The first sealant layer 51, the base layer 52, the intermediate layer 54, the barrier layer 56, the second sealant layer 57, 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 performing the above-mentioned lamination, the film may be subjected to pretreatment, such as corona treatment or ozone treatment, if necessary.

[0069] The printed layer 55 is a layer on which a picture or the like is printed, and is a layer for improving the design of the laminated sheet 50. The printed layer 55 may be an ink composition obtained by adjusting the ink composition by adding one or more of ordinary ink vehicles as the main component, if necessary, optionally adding one or more of plasticizers, stabilizers, antioxidants, light stabilizers, ultraviolet absorbers, curing agents, crosslinking agents, lubricants, antistatic agents, fillers, and other additives, and further adding a colorant such as a dye or pigment, and thoroughly kneading the mixture 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, ethyl cellulose, chlorinated rubber, cyclized rubber, and others, and one or more of these may be used in combination. The printing method may be gravure printing, letterpress printing, screen printing, transfer printing, flexographic printing, or other printing methods.

[0070] The barrier layer 56 is a layer for preventing the permeation of oxygen gas, water vapor, and the like. For example, a gas barrier material against oxygen gas, water vapor, and the like, a light-shielding material against sunlight, and a material that has aroma retention properties for the contents can be used as the barrier layer 56. Specifically, for example, aluminum foil, tin, lead, copper, iron, nickel, or alloys thereof, or a thin vapor-deposited metal layer of aluminum or the like can be used as the barrier layer 56. When aluminum foil is used as the barrier layer 56, the thickness of the barrier layer 56 can be approximately 5 μm or more and 20 μm or less. Of these, aluminum foil is preferred in terms of aroma retention properties.

[0071] Furthermore, when a metal vapor deposition layer such as aluminum is used as the barrier layer 56, a vapor deposition thin film of a metal such as aluminum can be formed on a film layer supporting the metal vapor deposition layer by using a physical vapor deposition method (PVD method) such as vacuum deposition, sputtering, ion plating, or cluster ion beam method.

[0072] When a metal vapor-deposited aluminum layer is used as the barrier layer 56, the thickness of the barrier layer 56 is usually preferably about 5 nm or more and 300 nm or less, and particularly preferably about 10 nm or more and 200 nm or less. The surface of the film layer supporting the above-mentioned vapor-deposited thin aluminum film can be coated in advance with, for example, a vapor deposition primer to improve the adhesion of the vapor-deposited film, and other required pretreatments can also be applied as desired.

[0073] The barrier layer 56 may also be a transparent vapor-deposited layer that can be formed by a conventionally known method. By using a transparent vapor-deposited layer as the barrier layer 56, the laminated sheet 50 can also be made transparent. In this case, the barrier layer 56 may be a transparent vapor-deposited layer made of a vapor-deposited layer of an inorganic oxide.

[0074] The transparent vapor-deposited layer may be, for example, a vapor-deposited 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 tubular containers, it is preferable to provide a vapor-deposited layer of aluminum oxide or silicon oxide.

[0075] Inorganic oxides are expressed as MOX (where M represents an inorganic element, and the value of X varies depending on the inorganic element), such as SiOX or AlOX. The range 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, the material is a completely inorganic element (pure substance) and is not transparent. The upper limit of the range of X is the value for complete oxidation. Silicon (Si) and aluminum (Al) are preferably used for packaging materials, with silicon (Si) having a value in the range of 1.0 to 2.0 and aluminum (Al) having a value in the range of 0.5 to 1.5.

[0076] The thickness of the transparent vapor-deposited layer varies depending on the type of inorganic oxide used, but is preferably 5 nm to 200 nm, more preferably 10 nm to 100 nm. For example, in the case of a vapor-deposited layer of aluminum oxide or silicon oxide, the thickness is preferably 5 nm to 50 nm, more preferably 10 nm to 30 nm.

[0077] The transparent vapor deposition layer can be formed on a film layer supporting the transparent vapor deposition layer using the following formation methods. Examples of methods for forming the vapor deposition layer include physical vapor deposition (PVD) methods such as vacuum deposition, sputtering, and ion plating, and chemical vapor deposition (CVD) methods such as plasma-enhanced 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.

[0078] The material constituting the film layer supporting the metal vapor deposition layer or the transparent vapor deposition layer can be, for example, the same material as that of the above-mentioned base layer 52. In this embodiment, the thickness of the above-mentioned film layer is preferably 10 μm or more and 25 μm or less.

[0079] The design improving layer 58 is a layer for improving the vividness of the colors printed on the laminated sheet 50 for tube containers. The design-improving layer 58 is preferably disposed on the inner side of the base material layer 52 having the printed layer. When a vapor-deposited metal layer of aluminum or the like is used as the design-improving layer 58, a vapor-deposited thin film of metal such as aluminum can be formed on the base material film layer using, for example, a physical vapor deposition method (PVD method) such as vacuum deposition, sputtering, ion plating, or cluster ion beam method.

[0080] When an aluminum metal vapor deposition layer is used as the design improving layer 58, the thickness of the metal vapor deposition layer is usually preferably about 5 to 300 nm or less, and particularly preferably about 10 to 200 nm or less. Furthermore, the surface of the substrate layer supporting the aluminum vapor deposition thin film can be coated in advance with, for example, a vapor deposition primer to improve the adhesion of the vapor deposition film, and other required pretreatments can also be applied as desired.

[0081] The substrate layer 58a supporting the above-mentioned metal vapor-deposited thin film layer can be made of the same material as the above-mentioned substrate layer 52. It is particularly preferable to use a film such as polyethylene terephthalate or nylon as the supporting substrate layer.

[0082] Next, a method for manufacturing the tube container 10 will be described.

[0083] First, the base material layer 52 is printed to form a printed layer 55 made of printing ink on the base material layer 52 .

[0084] Next, the first sealant layer 51, the base layer 52 on which the printed layer 55 is formed, the intermediate layer 54, and the second sealant layer 57 are bonded together by, for example, a dry lamination method, thereby obtaining a laminate sheet 50 as shown in FIG.

[0085] The laminated sheet 50 obtained in this manner is formed into a cylindrical shape as shown in Figure 5, and, for example, its ends 35 are overlapped and the outer surface 501 and inner surface 502 of the laminated sheet 50 are heat-sealed at the ends 35 to produce the body tube 30.

[0086] In this case, the first sealant layer 51 provided on the outer surface 501 side of the laminated sheet 50 and the second sealant layer 57 provided on the inner surface 502 side are melted and joined together to obtain the body tube 30.

[0087] Next, the above-described tube container 10 is manufactured by compression molding. In this process, the body tube 30 is inserted into a mold (not shown), and molten resin is supplied into the mold from a resin supply device (not shown), thereby compression molding the head member 40 into one opening 50A of the body tube 30. This results in a tube container 10 including the body tube 30 and the head member 40 joined to one end 31 of the body tube 30.

[0088] As described above, the body tube 30 and the head member 40 are joined by thermal welding when the head member 40 is formed by compression molding. However, this is not limitative, and the body tube 30 and the head member 40 may also be joined by injection molding.

[0089] Next, the cap 20 is attached to the head member 40 of the obtained tube container 10, thereby obtaining a capped tube container 10A with the cap 20 attached as shown in Fig. 6. Thereafter, the contents to be filled and packaged are filled into the opening 50B at the lower end before the capped tube container 10A manufactured above is completed, and then the opening is heat-sealed to form a bottom weld, thereby producing a capped tube container 10A filled and packaged with the contents C.

[0090] In the above, examples of the contents C to be filled and packaged include toothpaste, cosmetics, glue, mustard greens, wasabi paste, cream, paint, ointment, medicine, and the like. [Example]

[0091] Next, a specific example of the above embodiment will be described.

[0092] Example 1 First, the laminated sheet 50 shown in FIG. 4 that constitutes the body tube 30 was prepared.

[0093] First, a biaxially stretched polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., product name "E5200", thickness 12 μm) with both sides corona discharge treated was prepared as the substrate layer 52. Next, a polyurethane gravure ink (manufactured by Toyo Ink Co., Ltd., product name "NEWLP Super", mass after drying 3 g / m) was applied as the printing layer 55 onto the polyethylene terephthalate film. 2 ) was formed.

[0094] As the design improving layer 58, a polyethylene terephthalate film (58a, manufactured by Mitsubishi Chemical Corporation, product name "1310", thickness 12 μm) provided with an aluminum vapor deposition layer (58b) was prepared.

[0095] Next, the polyethylene terephthalate film for the base layer 52 and the polyethylene terephthalate film 58a for the design improving layer 58 were bonded together as the second adhesive layer 53b by dry lamination to prepare a first intermediate body.

[0096] The layer structure of the obtained first intermediate body is as follows. PET / Printing layer / DL / AL vapor deposition layer / PET In the above, "PET" means biaxially oriented polyethylene terephthalate (the same applies below). Also, "AL" means aluminum (the same applies below). Also, "DL" means a two-component curing urethane adhesive (main component: polyester resin, curing agent: aliphatic polyisocyanate, dry mass 3.5 g / m 2 ) refers to an adhesive layer formed by the dry lamination method (same below).

[0097] Next, low-density polyethylene (thickness: 20 μm) as the third adhesive layer 53c was extruded onto the design-improving layer 58 of the above-mentioned first intermediate body via an anchor coating material, and a high-density milky white polyethylene film (manufactured by Sumika Sekisui Film Co., Ltd., product name "HW10C", thickness: 60 μm, density: 0.999 g / cm) as the intermediate layer 54 was then formed on the third adhesive layer 53c. 3 , MFR: 0.06 g / 10 min, biomass content: 0%) were layered to prepare a second intermediate.

[0098] The layer structure of the obtained second intermediate body is as follows. PET / printing layer / DL / AL vapor deposition layer / PET / AC / LDPE / HDPE In the above, "AC" means anchor coat material (same below). Also, "LDPE" means low density polyethylene (same below). Also, "HDPE" means high density polyethylene (same below).

[0099] An ethylene-methacrylic acid copolymer (thickness 20 μm) was extruded onto the intermediate layer 54 of the above-mentioned second intermediate body via an anchor coating material as the fourth adhesive layer 53d, and aluminum foil (thickness 10 μm) was laminated on the adhesive layer as the barrier layer 56. Next, an ethylene-methacrylic acid copolymer (35 μm) was extruded onto the aluminum foil as the fifth adhesive layer 53e, and low-density polyethylene (25 μm) was extruded onto the aluminum foil as the sixth adhesive layer 53f, and low-density polyethylene (manufactured by Japan Polyethylene Corporation, product name "LC602A", thickness 25 μm) as the second sealant layer 57 was laminated on the sixth adhesive layer 53f to produce a third intermediate body.

[0100] The layer structure of the obtained third intermediate was as follows: PET / printing layer / DL / AL vapor deposition layer / PET / AC / LDPE / HDPE / AC / EMAA / AL / EMAA / LDPE / LDPE In the above, "EMAA" means ethylene-methacrylic acid copolymer (the same applies hereinafter).

[0101] Next, low-density polyethylene (thickness: 20 μm) was extruded onto the base layer 52 of the above-mentioned third intermediate body via an anchor coating material to form the first adhesive layer 53a, and low-density polyethylene (manufactured by Japan Polyethylene Corporation, product name "LC602A", thickness: 30 μm) was laminated onto the first adhesive layer 53a to form the first sealant layer 51. Subsequently, an OP varnish coating layer 51a (ultraviolet radiation curable varnish, product name "FDFL AQF4", manufactured by Toyo Ink Co., Ltd., mass after drying: 3 g / m) was gravure coated onto the first sealant layer 51. 2 After the OP varnish coating layer 51a was gravure coated, it was cured by ultraviolet irradiation.

[0102] In this way, a laminate sheet 50 was produced. The resulting laminate sheet 50 had the following layer structure: The total thickness was 269 μm. OP varnish / LDPE30μm / LDPE20μm / AC / PET12μm / printing layer / DL / AL vapor deposition layer / PET12μm / AC / LDPE20μm / HDPE60μm / AC / EMAA20μm / AL10μm / EMAA35μm / LDPE25μm / LDPE25μm

[0103] <Loop stiffness measurement> Next, loop stiffness measurements were performed on the laminate sheet 50 and intermediate layer 54. A "LOOP STIFFNESS TESTER" manufactured by Toyo Seiki Co., Ltd. was used to measure the loop stiffness. The laminate sheet 50 and intermediate layer 54 constituting each of the obtained packaging materials were cut in the height direction D1 of the tube container to obtain measurement samples each measuring 15 mm wide and 100 mm long. Next, with the heat-sealable resin layer of the measurement sample facing inward, both ends of the measurement sample were clamped with clips to form a circular loop with a loop length of 70 mm in the center of the length. The obtained circular loop was pressed from the opposite side of the clip at a pressing speed of 3.3 mm / sec. The load required to reach a load range of 5000 mN was taken as the loop stiffness value. The measurement results are shown in Table 1.

[0104] <Laminate strength evaluation test> Next, the body tube 30 of the capped tube container 10A was cut into 15 mm wide strips, and the adhesion strength between the third adhesive layer 53c and the intermediate layer 54 and the adhesion strength between the intermediate layer 54 and the fourth adhesive layer 53d were measured using a tensile testing machine (STA-1150, manufactured by Orientec Co., Ltd.) in accordance with JIS K6854-2.

[0105] The measurement was performed by pulling the specimen in opposite directions (180° peeling: T-peel method) perpendicular to the surface direction of the portion that had been peeled off beforehand for the measurement at a speed of 50 mm / min, and measuring the average value of the tensile stress.

[0106] Example 2 The intermediate layer 54 was a biomass-derived high-density milky white polyethylene film (manufactured by Sumika Sekisui Film Co., Ltd., product name "CBHW10C", thickness 60 μm, density: 1.003 g / cm 3 A laminated sheet 50 and a tube container 10A with a cap were produced in the same manner as in Example 1, except that a cellulose acylate having a molecular weight of 1.3 g / 10 min, a biomass content of 10%) was used. A loop stiffness test and a laminate strength evaluation test were also carried out in the same manner as in Example 1.

[0107] The layer structure of the laminated sheet 50 according to Example 2 (total thickness: 269 μm) is as follows. OP varnish / LDPE30μm / LDPE20μm / AC / PET12μm / printing layer / DL / AL vapor deposition layer / PET12μm / AC / LDPE20μm / HDPE60μm / AC / EMAA20μm / AL / EMAA35μm / LDPE25μm / LDPE25μm

[0108] Example 3 The laminated sheet 50 and the capped tube container 10A were produced in the same manner as in Example 1, except that the design-improving layer 58 was not used, a multilayer sealant was used as the first sealant layer 51, in which a low-density polyethylene (manufactured by Japan Polyethylene Co., Ltd., product name "LC602A", thickness 30 μm) was laminated with a linear low-density polyethylene (manufactured by Prime Polymer Co., Ltd., product name "SP2320", thickness 60 μm), a high-density milky white polyethylene film (manufactured by Sumika Sekisui Film Co., Ltd., product name "HW10C", thickness 80 μm) was used as the intermediate layer 54, and a linear low-density polyethylene (manufactured by Prime Polymer Co., Ltd., product name "UZ2021L", thickness 100 μm) was used as the second sealant layer 57. Also, a loop stiffness value test and a laminate strength evaluation test were performed in the same manner as in Example 1.

[0109] The layer structure of the laminated sheet 50 according to Example 3 (total thickness: 362 μm) is as follows. OP varnish / LDPE 30μm / LLDPE 60μm / LDPE 20μm / AC / PET 12μm / printing layer / DL / HDPE 80μm / AC / EMAA 20μm / AL 10μm / EMAA 30μm / LLDPE 100μm

[0110] Example 4 The intermediate layer 54 was a biomass-derived high-density milky white polyethylene film (manufactured by Sumika Sekisui Film Co., Ltd., product name "CBHW10C", thickness 80 μm, density: 1.003 g / cm 3A laminated sheet 50 and a tube container 10A with a cap were produced in the same manner as in Example 3, except that a cellulose acylate having a molecular weight of 1.3 g / 10 min, a biomass content of 10%) was used. A loop stiffness test and a laminate strength evaluation test were also carried out in the same manner as in Example 1.

[0111] The layer structure of the laminated sheet 50 according to Example 4 (total thickness: 362 μm) is as follows. OP varnish / LDPE 30μm / LLDPE 60μm / LDPE 20μm / AC / PET 12μm / printing layer / DL / HDPE 80μm / AC / EMAA 20μm / AL 10μm / EMAA 30μm / LLDPE 100μm

[0112] Example 5 As the intermediate layer 54, a high-density transparent polyethylene film (manufactured by Sumika Sekisui Film Co., Ltd., product name "HW10C (transparent)", thickness 80 μm, density: 0.999 g / cm 3 A laminated sheet 50 and a tube container 10A with a cap were produced in the same manner as in Example 3, except that a polyester fiber having a molecular weight of 1.2g / 10min, MFR of 0.06g / 10min, and a biomass content of 0%) was used, and a design-improving layer 58 was used. In addition, a loop stiffness value test and a laminate strength evaluation test were carried out in the same manner as in Example 1.

[0113] The layer structure of the laminated sheet 50 according to Example 5 (total thickness: 374 μm) is as follows. OP varnish / LDPE 30μm / LLDPE 60μm / LDPE 20μm / AC / PET 12μm / printed layer / DL / AL vapor-deposited layer / PET 12μm / DL / HDPE 80μm / AC / EMAA 20μm / AL 10μm / EMAA 30μm / LLDPE 100μm

[0114] Example 6 The intermediate layer 54 was a biomass-derived high-density transparent polyethylene film (manufactured by Sumika Sekisui Film Co., Ltd., product name "CBHW10C (transparent)", thickness 80 μm, density: 1.003 g / cm 3A laminated sheet 50 and a tube container 10A with a cap were produced in the same manner as in Example 5, except that a cellulose acylate having a molecular weight of 1.3 g / 10 min and a biomass content of 10%) was used. A loop stiffness test and a laminate strength evaluation test were also carried out in the same manner as in Example 1.

[0115] The layer structure of the laminated sheet 50 according to Example 6 (total thickness: 374 μm) is as follows. OP varnish / LDPE 30μm / LLDPE 60μm / LDPE 20μm / AC / PET 12μm / printed layer / DL / AL vapor-deposited layer / PET 12μm / DL / HDPE 80μm / AC / EMAA 20μm / AL 10μm / EMAA 30μm / LLDPE 100μm

[0116] Example 7 A laminate sheet 50 and a capped tube container 10A were produced in the same manner as in Example 1, except that the OP varnish coating layer 51a was not used, and a linear low-density polyethylene (manufactured by Dai Nippon Printing Co., Ltd., product name "SP100AS", thickness 80 μm) was used as the first sealant layer 51, a high-density transparent polyethylene film (manufactured by Sumika Sekisui Film Co., Ltd., product name "HW10C (transparent)", thickness 80 μm) was used as the intermediate layer 54, a polyethylene terephthalate film with an aluminum vapor deposition layer was used instead of aluminum foil as the barrier layer 56, and a linear low-density polyethylene (manufactured by Aicello Co., Ltd., product name "L100N", thickness 80 μm) was used as the second sealant layer 57. A loop stiffness value test and a laminate strength evaluation test were also performed in the same manner as in Example 1.

[0117] The layer structure of the laminate according to Example 7 (total thickness: 339 μm) is as follows: LLDPE80μm / LDPE25μm / AC / PET12μm / Printing layer / LDPE25μm / HDPE80μm / DL / Transparent vapor deposition layer / PET12μm / AC / EMAA25μm / LLDPE80μm

[0118] Example 8 The intermediate layer 54 was a biomass-derived high-density transparent polyethylene film (manufactured by Sumika Sekisui Film Co., Ltd., product name "CBHW10C (transparent)", thickness 80 μm, density: 1.003 g / cm 3 A laminated sheet 50 and a tube container 10A with a cap were produced in the same manner as in Example 7, except that a cellulose acylate having a molecular weight of 1.3 g / 10 min and a biomass content of 10%) was used. A loop stiffness test and a laminate strength evaluation test were also carried out in the same manner as in Example 1.

[0119] The layer structure of the laminated sheet 50 according to Example 8 (total thickness: 339 μm) is as follows. LLDPE80μm / LDPE25μm / AC / PET12μm / Printing layer / LDPE25μm / HDPE80μm / DL / Transparent vapor deposition layer / PET12μm / AC / EMAA25μm / LLDPE80μm

[0120] (Comparative Example 1) A laminate sheet 50 and a capped tube container 10A were produced in the same manner as in Example 1, except that the thickness of the first sealant layer 51 was changed to 35 μm, the thickness of the first adhesive layer 53a was changed to 20 μm, and a linear low-density milky white polyethylene film (manufactured by Dai Nippon Printing Co., Ltd., product name "SR-WN2 White", thickness 130 μm) was used as the intermediate layer 54. Furthermore, a loop stiffness value test and a laminate strength evaluation test were conducted in the same manner as in Example 1.

[0121] The layer structure of the laminated sheet according to Comparative Example 1 (total thickness: 349 μm) is as follows: OP varnish / LDPE35μm / LDPE25μm / AC / PET12μm / Print layer / DL / AL vapor deposition layer / PET12μm / AC / LDPE20μm / LLDPE130μm / AC / EMAA20μm / AL10μm / EMAA35μm / LDPE25μm / LDPE25μm

[0122] (Comparative Example 2) A laminate sheet 50 and a tube container 10A with a cap were produced in the same manner as in Example 3, except that a linear low-density milky white polyethylene film (manufactured by Dai Nippon Printing Co., Ltd., product name "SR-WN2 White", thickness 130 μm) was used as the intermediate layer 54. In addition, a loop stiffness value test and a laminate strength evaluation test were conducted in the same manner as in Example 1.

[0123] The layer structure of the laminated sheet according to Comparative Example 2 (total thickness: 387 μm) is as follows. OP varnish / LDPE 30 μm / LLDPE 60 μm / LDPE 20 μm / AC / PET 12 μm / printing layer / DL / LLDPE 100 μm / AC / EMAA 20 μm / AL 10 μm / EMAA 35 μm / LLDPE 100 μm

[0124] (Comparative Example 3) A laminate sheet 50 and a capped tube container 10A were produced in the same manner as in Example 5, except that a linear low-density milky white polyethylene film (manufactured by Dai Nippon Printing Co., Ltd., product name "SR-WN2 White", thickness 130 μm) was used as the intermediate layer 54. In addition, a loop stiffness value test and a laminate strength evaluation test were conducted in the same manner as in Example 1.

[0125] The layer structure of the laminated sheet according to Comparative Example 3 (total thickness: 394 μm) is as follows. OP varnish / LDPE 30μm / LLDPE 60μm / LDPE 20μm / AC / PET 12μm / printed layer / DL / AL vapor-deposited layer / PET 12μm / DL / LLDPE 100μm / AC / EMAA 20μm / AL 10μm / EMAA 30μm / LLDPE 100μm

[0126] Comparative Example 4 A laminate sheet 50 and a capped tube container 10A were produced in the same manner as in Example 8, except that a linear low-density milky white polyethylene film (manufactured by Dai Nippon Printing Co., Ltd., product name "SR-WN2 White", thickness 130 μm) was used as the intermediate layer 54. In addition, a loop stiffness value test and a laminate strength evaluation test were conducted in the same manner as in Example 1.

[0127] The layer structure of the sheet according to Comparative Example 4 (total thickness: 359 μm) is as follows: LLDPE80μm / LDPE25μm / AC / PET12μm / Print layer / LDPE25μm / LLDPE100μm / DL / Transparent vapor deposition layer / PET12μm / AC / EMAA25μm / LLDPE80μm

[0128] The results are shown in Tables 1 and 2. Table 1 shows the results of the loop stiffness value test, and Table 2 shows the results of the laminate strength evaluation test.

[0129] [Table 1]

[0130] [Table 2]

[0131] As a result, as shown in Table 1, the loop stiffness values of the laminate sheets 50 according to Comparative Examples 1 to 4 were 1.07 N / 15 mm or less at a total thickness of about 350 μm. On the other hand, the loop stiffness values of the laminate sheets 50 according to Examples 1 to 8 were all 1.10 N / 15 mm or more at a thickness of about 270 μm. As described above, it was found that the laminate sheets 50 according to Examples 1 to 8 had excellent flex resistance (stiffness) and high mechanical strength. Furthermore, the loop stiffness values of the intermediate layers 54 according to Comparative Examples 1 to 4 were 0.85 N / 15 mm or less at a thickness of 100 μm. On the other hand, the loop stiffness values of the second intermediate layers 54b according to Examples 1 to 8 were all 1.38 N / 15 mm or more at a thickness of 100 μm. Thus, it was found that the laminated sheets 50 according to Examples 1 to 8 had excellent stiffness.

[0132] Furthermore, as shown in Table 2, it was found that the capped tube containers 10A containing contents according to Examples 1 to 8 had lamination strength equal to or greater than that of the capped tube containers containing contents according to Comparative Examples 1 to 4.

[0133] Furthermore, in the capped tube container 10A filled with contents according to the present embodiment, the total thickness of the entire laminated sheet can be reduced while maintaining the strength (rigidity) of the body of the tube container compared to conventional capped tube containers filled with contents. As a result, it was found that the capped tube container 10A filled with contents according to the present embodiment is less likely to leave residue in the shoulder portion 41, making it easier to squeeze out the contents. [Explanation of symbols]

[0134] 10 tube containers 10A Tube with Cap 20 caps 30 Body tube 31 one end 32 Body seal 33 Other end 34 Bottom seal 35 End 35a Edge 40 Head member 41 Shoulder 42 Mouth 50 Laminated sheet for forming the body of a tube container (laminate sheet) 50A opening 50B opening 501 Exterior 502 Inside 51 First sealant layer 51a OP varnish coating layer 52 Base material layer 53a 1st adhesive layer 53b 2nd adhesive layer 53c 3rd adhesive layer 53d 4th adhesive layer 53e 5th adhesive layer 53f 6th adhesive layer 54 Middle Class 55 Printing layer 56 Barrier Layer 57 Second sealant layer 58 Design improvement layer 58a Design enhancement layer (base material layer) 58b Design improvement layer (vapor deposited layer) D1 Height direction of tube container D2 Width direction of tube container

Claims

1. A laminated sheet for forming a body of a tube container, The laminated sheet includes, in order from the outside, at least a first sealant layer, a base layer, an intermediate layer, and a second sealant layer, the intermediate layer contains milky white polyethylene as a main component, A laminated sheet for forming a body portion of a tube container, wherein the loop stiffness value in one direction of the intermediate layer is 0.60 N / 15 mm or more and 1.60 N / 15 mm or less.

2. 2. The laminated sheet for forming a body portion of a tubular container according to claim 1, wherein the substrate layer is a biaxially stretched film.

3. 3. The laminated sheet for forming a body portion of a tubular container according to claim 1, wherein the polyethylene constituting the intermediate layer is high-density polyethylene.

4. 4. The laminated sheet for forming a body portion of a tubular container according to claim 1, wherein the polyethylene constituting the intermediate layer comprises biomass-derived polyethylene obtained by polymerizing a monomer containing biomass-derived ethylene.

5. The laminate sheet for forming a tube container body portion according to claim 1 , further comprising a barrier layer disposed between the intermediate layer and the second sealant layer.

6. A laminated sheet for forming a body portion of a tube container according to any one of claims 1 to 5, a tube container having a head member.

7. The tube container according to claim 6 ; A capped tube container comprising: a cap attached to the head member.

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