Laminated sheet for tube container and tube container

Abstract

To provide a laminated sheet for a tube container and a tube container that can be easily reduced in volume at the time of disposal.SOLUTION: There is provided a laminated sheet 55 constituting a body of a tube container, including: an outer layer 1 and an inner layer 2 arranged in an order from an outer surface to an inner surface, the outer layer 1 including a first sealant layer 56 and a base material layer 58 in an order from the outer surface, the outer layer 1 including a cut line 13, the inner layer 2 including a second sealant layer 59, and the inner layer 2 including easily-peeling layer 52 that are easily peeled off on a surface in contact with the outer layer 1.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a laminate sheet for a tube container and a tube container. [Background technology]

[0002] Tube containers are filled and packaged with the contents, and the required amount can be squeezed out at the time of use. For this reason, tube containers are widely used as containers for foods, cosmetics, medicines, etc.

[0003] Such tube containers are usually composed of a body portion whose main component is synthetic resin, and a head member including a mouth portion (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 5-220900 Summary of the Invention [Problem to be solved by the invention]

[0005] However, due to the recent growing interest in environmental protection, there is a demand for environmentally friendly containers that can be easily crushed to reduce their volume. [Means for solving the problem]

[0006] The present disclosure has been made in light of the above circumstances, and has an object to provide a laminate sheet for tube containers and a tube container that can be easily reduced in volume when disposed of.

[0007] That is, the laminate sheet for a tube container of the present disclosure is a laminate sheet constituting the body of a tube container, the laminate sheet comprising an outer layer and an inner layer arranged in sequence from the outer surface to the inner surface, the outer layer comprising, in sequence from the outer surface, a first sealant layer and a base layer, the outer layer comprising a score line, the inner layer comprising a second sealant layer, and the inner layer having an easily peelable layer on the surface in contact with the outer layer.

[0008] The tube container of the present disclosure further comprises a cylindrical body member formed by overlapping and joining opposing ends of the above-mentioned laminate sheet for tube containers, and a head member joined to one end of the cylindrical body member, the head member including a shoulder portion and a mouth portion. Effect of the Invention

[0009] The present disclosure has an effect of providing a laminate sheet for tube containers and a tube container that can be easily reduced in volume when disposed of. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a partial vertical cross-sectional view showing the tube container according to the present embodiment with a cap attached. [Diagram 2] FIG. 2 is a partial vertical cross-sectional view showing the tube container according to the present embodiment filled with contents. [Diagram 3] FIG. 2 is a partial vertical cross-sectional view of the tube container according to the present embodiment with a portion of the outer layer cut away. [Figure 4] FIG. 2 is a partial vertical cross-sectional view of a shrunk tube container with a portion of the outer layer cut away according to the present embodiment. [Diagram 5] Cross-sectional view taken along line XX in Figure 1. [Figure 6] FIG. 6 is a cross-sectional view showing another laminate sheet of FIG. 5. [Figure 7] FIG. 6 is a cross-sectional view showing another laminate sheet of FIG. 5. [Figure 8] 5A to 5C are diagrams showing a method for manufacturing a tube container. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Figures 1 to 8 are diagrams showing one embodiment of the present disclosure. In addition, the numerical values ​​such as dimensions of each member and the names of materials described in this specification are examples of the embodiment, and are not limited thereto, and can be appropriately selected and used.

[0012] FIG. 1 is a partial cross-sectional view of a tube container according to this embodiment with a cap attached. As shown in Fig. 1, the tube container 10 includes a body 50 formed of a laminate sheet 55 described below, and a head member 40 fabricated by providing a synthetic resin to the body 50 by a method such as compression molding or injection molding. The head member 40 further includes a shoulder portion 12 and a mouth portion 11. A cap 20 is attached to the mouth portion 11 of the tube container 10. Furthermore, a cut line 13 for peeling off the outer layer 1 is formed in the body 50. The cut line 13 goes around the cylindrical body 50. A notch 14 is formed in the side seal portion 18 of the body 50, connecting with the first cut line 13a and the second cut line 13b.

[0013] FIG. 2 is a partial cross-sectional view of a packaged product of a tube container 10A filled with contents. As shown in FIG. 2, a tube container 10A filled with contents comprises a multi-layer outer layer 1 that forms an outer shell, and an inner layer 2 that is freely shrinkable and deformable and contains the contents. The outer layer 1 and the inner layer 2 are joined and fixed at a connecting portion of a head member at the upper end and a bottom seal portion 17 at the lower end.

[0014] FIG. 3 is a partial vertical cross-sectional view of a tube container 10B according to this embodiment with a portion of the outer layer cut away. 3, when the tube container 10A filled with contents is discarded after use, a part of the outer layer 1 is cut off along the first cut line 13a and the second cut line 13b to reveal the inner layer 2 located inside the cut outer layer 1. Here, the first cut line 13a and the second cut line 13b refer to imaginary lines along which the outer layer 1 of the tube container 10B is cut off. By cutting the outer layer 1 along the first cut line 13a and the second cut line 13b in a strip shape, the body 50 is divided into two parts, upper and lower, sandwiching the exposed inner layer 2. Hereinafter, the upper part of the body 50 divided into two parts will be referred to as the upper body 50a and the lower part will be referred to as the lower body 50b.

[0015] The above-mentioned score line 13 can be formed across the entire width of the body of the tube container 10 at the portion of the outer layer 1 to be peeled off. By forming the score line 13 in a straight line, the outer layer 1 can be easily cut off. By peeling off the outer layer 1, the volume of the tube container can be reduced, and the environmental load can be reduced.

[0016] The number of cut lines 13 may be one or more. The shape of the cut line 13 can be freely formed, and it is possible to form a half cut, a dotted line, less than, greater than, tortoise shell brackets, a slash, a plus, or the like. The position of the first cut line 13a is not particularly limited, but from the standpoint of reducing the volume of the tube container, it is preferable, for example, to provide the first cut line 13a at a position 5.0 mm to 10.0 mm below the position on the side of the body of the tube container that will be joined to the head member, and to provide the second cut line 13b at a position 5.0 mm to 10.0 mm above the position on the bottom side of the body of the tube container.

[0017] FIG. 4 is a partial vertical sectional view of a tubular container B according to this embodiment, with a part of the outer layer 1 cut away, in a contracted state. As shown in FIG. 4, when a tube container B, from which a portion of the outer layer 1 has been cut into a strip shape, is pressed into the two separated upper body portion 50a against the lower body portion 50b, the inner layer 2 sandwiched between the upper body portion 50a and the lower body portion 50b is deformed, thereby reducing the volume of waste in the tube container.

[0018] The tube container 10 having such a configuration is obtained through the following manufacturing process.

[0019] A laminate sheet 55 for the cylindrical body of a tube container according to the present disclosure, which will be described later, is used to overlap both ends of the laminate sheet 55 for a tube container, which will be described later, and the outside and inside of the overlapped portion are heat-sealed to form a side seal portion 18, thereby producing a cylindrical body. Next, the cylindrical body is placed in a mold, and a shoulder portion and a mouth portion are formed at one opening of the cylindrical body 50 by a method such as compression molding. In this way, the shoulder portion and the mouth portion are integrally formed at one opening of the cylindrical body, and the tube container 10 is produced. Then, a cap 20 is attached to the mouth portion of the tube container 10 (see FIG. 1).

[0020] A bottom seal portion 17 is formed at the other opening of the cylindrical body portion 50 by bonding together laminate sheets 55 for tube containers, which will be described later. This bottom seal portion 17 is formed by bonding together laminate sheets 55 for tube containers, which will be described later, near the opening 16 formed at the other end of the cylindrical body portion 50 after, for example, an appropriate amount of content C is filled into the opening 16 (see FIG. 2).

[0021] Next, the laminate sheet 55 for tube containers according to the present embodiment will be described with reference to Fig. 5 to Fig. 7. Fig. 5 is a cross-sectional view taken along the line XX in Fig. 1. As shown in Fig. 5, the portion of the laminate sheet 55 for tube containers where the outer layer 1 is to be peeled off has a double structure having the outer layer 1 and the inner layer 2, and has an easily peelable layer 52 on the surface in contact with the outer layer 1 and the inner layer 2. The outer layer 1 also has a cut line 13 for peeling.

[0022] According to this embodiment, the score lines 13 formed in the outer layer 1 of the tube container 10 are formed by laser processing.

[0023] The outer layer 1 includes, arranged in this order from the outside to the inside, a first sealant layer 56, a first adhesive layer 57a, and a base layer 58. The inner layer 2 includes an easily peelable layer 52 and a second sealant layer 59.

[0024] 6, in the tube container laminate sheet 55, the outer layer 1 includes a first sealant layer 56, a first adhesive layer 57a, and a base layer 58, which are arranged in this order from the outside to the inside, and may further include a second adhesive layer 57b and a light-shielding barrier layer 60. The inner layer 2 includes an easily peelable layer 52 and a second sealant layer 59.

[0025] 7, in a tube container laminate sheet 55, the outer layer 1 includes a first sealant layer 56, a first adhesive layer 57a, and a base layer 58, which are arranged in this order from the outside to the inside, and may further include a second adhesive layer 57b and a light-shielding barrier layer 60. The inner layer 2 may include an easily peelable layer 52, an intermediate layer 61, an oil barrier layer 62, and a second sealant layer 59.

[0026] In the tube container laminate sheet 55 shown in Figs. 5 and 6, for example, a printed layer may be provided on the inside of the base layer 58 by reverse printing.

[0027] In this specification, the terms "outside" and "inside" refer to the "outside" and "inside" when the tube container laminate sheet 55 is used to produce the tube container 10.

[0028] Next, each layer of the laminated sheet 55 for tube containers will be described.

[0029] The first sealant layer 56 and the second sealant layer 59 are layers for bonding the tube container laminate sheets 55 together. The materials constituting the first sealant layer 56 and the second sealant layer 59 may be any materials that can be melted and fused by heat.

[0030] The first sealant layer 56 and the second sealant layer 59 may be made of any material as long as they can be melted and fused to each other by heat. For example, low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), very low density polyethylene, polypropylene (PP), ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, acid-modified polyolefin resins obtained by modifying polyolefin resins such as polyethylene or polypropylene with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, and the like, polyvinyl acetate resins, polyester resins, polystyrene resins, and the like, may be used.

[0031] In the present embodiment, among the above, a low-density polyethylene film is preferable because it is easy to handle.

[0032] In this embodiment, for example, a resin composition can be prepared by using one or more of the above resins as the main component and optionally adding desired additives thereto, and then the resin composition prepared as above can be used.

[0033] In addition, as the material, for example, antiblocking agents, lubricants (fatty acid amides, etc.), flame retardants, inorganic or organic fillers, etc. may be added arbitrarily.

[0034] In the present embodiment, the thickness is preferably 10 μm or more and 200 μm or less, and more preferably 60 μm or more and 150 μm or less. If it is within the above range, it can be easily manufactured by an inflation molding method.

[0035] It is preferable that the first sealant layer 56 allows the printed layer formed on the base layer 58 to be seen through.

[0036] In this embodiment, the thickness of the first sealant layer 56 is preferably thinner than the thickness of the second sealant layer 59. By not making the first sealant layer too thick, it is possible to prevent a decrease in the visibility of a printed layer when the printed layer is provided on the inside of the base layer 58 by reverse printing. This makes it possible to prevent a decrease in the design of the cylindrical body of the tube container.

[0037] In the present embodiment, the first sealant layer 56 and the second sealant layer 59 can be prepared, for example, by preparing a resin composition using one or more of the above-mentioned resins as the main component and optionally adding desired additives thereto, and then using the resin composition prepared above, a film or sheet can be formed, for example, by the T-die method, the inflation molding method, or other molding method.

[0038] The base layer 58 may be made of any material that is strong, tough, and heat-resistant as a basic material constituting the tube container 10 .

[0039] Examples of materials that can be used to form the base layer 58 include films or sheets of polyester-based resins, polyamide-based resins, polyaramid-based resins, polyolefin-based resins, polycarbonate-based resins, polyacetal-based resins, fluorine-based resins, and other tough resins.

[0040] Among the above, polyester resins, particularly polyethylene terephthalate (PET) resins, are preferred in terms of printability. Here, polyethylene terephthalate resins refer to pure polyethylene terephthalate resins and various modified polyethylene terephthalate resins.

[0041] The base layer 58 may be any of an unstretched film, a uniaxially or biaxially stretched film, and the like. Among them, in this embodiment, a biaxially stretched polyester resin film is preferable because of its excellent printability. Also, according to this embodiment, the base layer 58 can be given easy-opening properties by the biaxial stretching treatment.

[0042] In the present embodiment, the thickness of the base layer 58 is preferably 10 μm or more and 25 μm or less.

[0043] 6, the score line 13 is formed in the outer layer 1 constituting the body portion 50, but is not formed in the inner layer 2. Therefore, the area where the outer layer 1 is cut along the score line remains covered by the oil barrier layer 62 and the gas barrier layer, and the oil barrier property and gas barrier property in the inner layer, which will be described later, can be continuously ensured.

[0044] Moreover, it is preferable that the score line 13 is not formed in the light-shielding barrier layer 60 in the outer layer 1. If the score line 13 is formed up to the light-shielding barrier layer 60, the gas barrier property and light-shielding property of the tube container 10 may be reduced.

[0045] Also, preferably, the score line 13 formed in the outer layer 1 penetrates at least the first sealant layer 56 and the base material layer 58 of the outer layer 1. By having the score line 13 penetrate the base material layer 58 having high strength, the outer layer 1 constituting the body portion 50 of the tube container 10 can be easily peeled off along the score line 13.

[0046] In addition, in the present disclosure, as shown in FIG. 1, a notch 14 may be provided on one or both sides of the widthwise end of the score line 13 to further improve the ease of opening.

[0047] The print layer is a layer for forming a pattern or the like on the tube container.

[0048] The printed layer can be formed on the above-mentioned base layer 58 by a printing method such as gravure printing, letterpress printing, screen printing, transfer printing, flexographic printing, ink-jet printing, or the like. The design is not particularly limited, and examples include letters, figures, symbols, patterns, and the like. It is preferable that the print layer is formed on the back surface of the base layer 58 rather than on the outermost surface, since this can prevent damage to the design layer due to external impact.

[0049] The printing layer may be an ink composition obtained by adding one or more of ordinary ink vehicles as the main component, optionally containing 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 colorants such as dyes and pigments, and thoroughly kneading the mixture with a solvent, diluent, etc. to prepare an ink composition. 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.

[0050] The light-shielding barrier layer 60 has a vapor barrier property that prevents the transmission of water vapor and a gas barrier property that prevents the transmission of gases such as oxygen gas.

[0051] In addition, the light-shielding barrier layer 60 has a function of preventing light from reaching the contents in the tube container 10, thereby suppressing deterioration of the quality of the contents, i.e., light-shielding properties. The light to be shielded by the light-shielding barrier layer 60 is mainly visible light and ultraviolet light, consisting of external light in a wavelength range of, for example, 300 to 800 nm, which is incident on the tube container laminate sheet 55 under normal use conditions. It is also preferable that the light-shielding barrier layer 60 also shields infrared light, for example, having a wavelength of more than 800 nm, as much as possible.

[0052] The light-shielding barrier layer 60 is not particularly limited as long as it satisfies the above-mentioned functions. In the present embodiment, the light-shielding barrier layer 60 may be a metal foil, a metal foil laminated with a PET film, a metal-deposited film, etc., and examples of the metal include aluminum, copper, stainless steel, etc. In the present embodiment, a layer made of aluminum is preferable. The term "aluminum layer" as used herein refers to a layer containing aluminum as a main component, and includes aluminum alloys and the like as long as the layer contains aluminum as a main component. When the light-shielding barrier layer 60 contains aluminum as a main component, the light-shielding barrier layer 60 exhibits extremely excellent gas barrier properties, light-shielding properties, and concealing properties. Typical examples of the aluminum layer include aluminum foil and aluminum alloy foil.

[0053] The thickness of the light-shielding barrier layer 60 is usually 5 to 40 μm, and preferably 7 to 20 μm. If the thickness is less than 5 μm, there is a risk that sufficient gas barrier properties cannot be obtained for use as a tube container 10. On the other hand, if the thickness exceeds 40 μm, the environmental load increases, which is not preferable.

[0054] The laminate sheet 55 for tube containers can further have an oil barrier layer 62 in the inner layer 2. This oil barrier layer 62 is a layer for preventing oil in the contents from seeping out to the outside of the tube container 10. This oil barrier layer 62 contains an ethylene-vinyl alcohol copolymer (EVOH). Since the oil barrier layer 62 contains an ethylene-vinyl alcohol copolymer, the oil barrier properties of the oil barrier layer 62 can be improved. This makes it possible to prevent oil contained in the contents from seeping out to the outside of the tube container 10.

[0055] The thickness of the oil barrier layer 62 may be about 10 μm or more and 30 μm or less.

[0056] The content of the barrier resin in the oil barrier layer 62 is preferably 50% by mass or more and 95% by mass or less, and more preferably 75% by mass or more and 90% by mass or less. By making the content of the barrier resin in the oil barrier layer 62 50% by mass or more, the oil barrier property can be further improved.

[0057] According to the present embodiment, the tube container laminate sheet 55 may further have a gas barrier layer between the intermediate layer 61 and the oil barrier layer 62. This can improve the gas barrier property of the tube container laminate sheet 55.

[0058] The gas barrier layer is a layer for suppressing the permeation of oxygen gas, water vapor, etc. As the gas barrier layer, for example, a gas barrier material against oxygen gas, water vapor, etc., a light-shielding material against sunlight, etc., or a material having aroma retention for the contents, etc. can be used. Specifically, as the gas barrier layer, for example, aluminum foil, tin, lead, copper, iron, nickel, or alloys thereof, or a thin metal deposition layer of aluminum, etc. can be used. When aluminum foil is used as the gas barrier layer, the thickness of the gas barrier layer can be about 5 μm or more and 20 μm or less.

[0059] Furthermore, when a vapor-deposited layer of a metal such as aluminum is used as the gas barrier layer, a vapor-deposited thin film of a metal such as aluminum can be formed on a support layer by using a physical vapor deposition method (PVD method) such as a vacuum deposition method, a sputtering method, an ion plating method, or a cluster ion beam method. When a metal vapor-deposited aluminum layer is used as the gas barrier layer, the thickness of the gas barrier layer is usually preferably about 5 nm to about 300 nm, more preferably about 10 nm to about 200 nm. In addition, the surface of the support layer supporting the above-mentioned vapor-deposited aluminum thin film can be coated in advance with, for example, a vapor deposition primer in order to increase the adhesion of the vapor-deposited film, and other required pretreatments can be optionally performed.

[0060] The gas barrier layer may be a transparent vapor-deposited layer that can be formed by a conventionally known method. In this case, the gas barrier layer may be a transparent vapor-deposited layer made of a vapor-deposited layer of an inorganic oxide.

[0061] The easily peelable layer 52 is formed on the surface side of the inner layer 2 that contacts the outer layer 1. Specifically, the easily peelable layer 52 is formed on the second sealant layer 59 or the intermediate layer 61. The easily peelable layer 52 is preferably formed at least in the region where the outer layer 1, sandwiched between the regions that will become the upper body portion 50a and the lower body portion 50b, will be cut away.

[0062] The easily peelable layer 52 can be made of a coating liquid such as a mixture of silicone compound, fluorine-based resin, or polyamide-based resin with nitrocellulose or cyclized rubber, or a mixture of these.

[0063] Among the coating materials, silicone compounds are particularly preferred in terms of heat resistance. The content of the silicone compound is usually 20% by weight or less, preferably 0.5 to 20% by weight. If the content of the silicone compound is more than 20% by weight, the coating film becomes sticky and the cost becomes high, and if it is less than 0.5% by weight, the effect of improving the releasability is not sufficient.

[0064] The coating amount of the easily peelable layer 52 after drying is 0.05 g / m 2 More than 0.5g / m 2 It is preferable that the thickness is 0.05 μm or less, or 0.05 μm or more and 0.5 μm or less.

[0065] The method of laminating the outer layer 1 and the inner layer 2 is preferably to bond the outer layer 1 and the inner layer 2 by thermal lamination. When the easily peelable layer 52 is mainly composed of a silicone compound, it exhibits plasticity and tackiness when heated. Therefore, a laminated sheet can be produced by thermally laminating the outer layer 1 and the inner layer 2.

[0066] The temperature for the thermal lamination is, for example, 80 to 200° C., preferably 100 to 190° C., and more preferably 120 to 180° C. This is because when the easily peelable layer 52 contains a silicone compound as a main component, plasticity is exhibited at a temperature of 80° C. or higher.

[0067] The peel strength between the outer layer 1 and the inner layer 2 is preferably 0.1 N / 15 mm width to 0.7 N / 15 mm width. If the peel strength exceeds 0.7 N / 15 mm width, there is a risk that peeling between the outer layer 1 and the inner layer 2 may become difficult. If it is less than 0.1 N / 15 mm width, there is a risk that peeling may occur during transportation of the tube container.

[0068] The first adhesive layer 57a and the second adhesive layer 57b are layers for adhering the first sealant layer 56, the base material layer 58, the light-shielding barrier layer 60, etc. The adhesive layers can be appropriately selected depending on the resin constituting the layers to be adhered.

[0069] As the adhesive layer, for example, anchor coating agents such as isocyanate-based (urethane-based), polyethyleneimine-based, polybutadiene-based, and organic titanium-based, or anchor coating agents such as polyurethane-based, polyacrylic-based, polyester-based, epoxy-based, polyvinyl acetate-based, cellulose-based, and other laminating adhesives, laminating adhesives, etc. can be used as desired.

[0070] As the adhesive layer, for example, polyethylene, polypropylene, linear low-density polyethylene, ethylene-vinyl alcohol, ethylene-methacrylic acid copolymer, ethylene-acrylic acid copolymer, ionomer, maleic anhydride modified polyolefin resin, etc. can be suitably used.

[0071] In this embodiment, the thickness of the adhesive layer is preferably 3 μm or more and 60 μm or less.

[0072] The adhesive strength of the adhesive layer is preferably 3 N / 15 mm or more and 10 N / 15 mm or less, and more preferably 5 N / 15 mm or more and 8 N / 15 mm or less.

[0073] The first sealant layer 56, the base layer 58, the light-shielding barrier layer 60, the gas barrier layer, and the like that constitute the outer layer 1 can be laminated by any method, such as wet lamination, dry lamination, solventless dry lamination, extrusion lamination, T-die co-extrusion molding, co-extrusion lamination molding, inflation molding, or any other method. When carrying out the above-mentioned lamination, the film can be subjected to pretreatment, such as corona treatment or ozone treatment, if necessary.

[0074] Furthermore, the laminate sheet 55 for tube containers may have an intermediate layer 61 provided on the inner layer 2 as required. The intermediate layer 61 is provided to adjust the thickness of the laminate sheet 55 for tube containers. An olefin resin may be used for the intermediate layer 61. 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 intermediate layer 61. The thickness of the intermediate layer 61 is preferably, for example, 50 μm to 200 μm.

[0075] In addition, in order to facilitate deformation when discarding the tube container, multiple creases 2a (grooves) may be provided on the top and bottom of either or both of the outer layer 1 and the inner layer 2. By providing the creases 2a, it is possible to compress the tube container into a bellows shape (see FIG. 4).

[0076] As described above, the tube container laminate sheet 55 includes the first sealant layer 56, the base layer 58, the light-shielding barrier layer 60, and the second sealant layer 59 in this order from the outer side of the container to the inner side of the container. The light-shielding barrier layer 60 made of aluminum is less likely to melt than the first sealant layer 56 and the base layer 58, and also scatters the laser light on its surface to some extent, so that it is less likely to be melted than the first sealant layer 56 and the base layer 58. Therefore, by appropriately irradiating the tube container laminate sheet 55 with laser light from the outside of the outer layer 1, it is possible to form the first cut line 13a and the second cut line 13b up to the first sealant layer 56 and the base layer 58, but not in the light-shielding barrier layer 60. When the outer layer 1 is peeled off, the light-shielding barrier layer 60 made of aluminum can be easily peeled off by following the outer layer 1.

[0077] The types of laser used for irradiation include YAG laser and CO2 laser (carbon dioxide laser).

[0078] Next, the head member 40 of the tube container 10 will be described.

[0079] The head member 40 has a mouth portion 11 and a shoulder portion 12 provided below the mouth portion 11. The shoulder portion 12 has a circular shape in horizontal cross section.

[0080] The head member 40 is made of a resin material such as high density polyethylene (HDPE). In addition to the high density polyethylene, an ethylene-α-olefin copolymer polymerized using a metallocene catalyst may also be used as the head member 40 of the tube container 10.

[0081] Next, the cylindrical body 50 will be described. The body 50 of the tube container 10 shown in Fig. 1 has a generally cylindrical shape. This body 50 is composed of a laminated tube container laminate sheet 55 (see Figs. 5 to 7), and is obtained by rolling this tube container laminate sheet 55 into a cylindrical shape, overlapping opposing ends, and joining them together by, for example, heat sealing. Therefore, the body 50 has side seal parts 18 where the tube container laminate sheets 55 are joined together along the longitudinal direction.

[0082] In terms of the thickness of the body 50, the outer layer 1 is preferably, for example, 100 μm or more and 210 μm or less. When the thickness of the outer layer is 100 μm or more, a predetermined strength can be maintained in the body of the tube container 10. This allows the shape retention of the tube container 10 to be maintained. Furthermore, when the thickness of the outer layer is 210 μm or less, the manufacturing cost of the laminate sheet 55 for tube containers can be reduced, and moldability can be ensured when the head member is molded by compression molding. The inner layer 2 is preferably, for example, 50 μm or more and 100 μm or less. When the thickness of the inner layer is 50 μm or more, the sealing strength can be ensured. Also, when the thickness of the inner layer is 100 μm, the manufacturing cost of the laminate sheet 55 for tube containers can be reduced.

[0083] Examples of the heat sealing (welding) method used in producing the cylindrical body of the tube container 10 include bar sealing, rotary roll sealing, belt sealing, impulse sealing, high frequency sealing, ultrasonic sealing, and flame sealing.

[0084] In addition, the head member 40 and the cylindrical body portion 50 of the tube container 10 according to the present embodiment are joined by thermal welding when the head member 40 is molded by compression molding. However, the present invention is not limited to this, and the head member and the cylindrical body portion of the tube container 10 may be joined by injection molding.

[0085] Next, a method for producing the above-mentioned tube container 10 by using a compression molding method will be described with reference to FIG.

[0086] 8(a), this cylindrical body portion (body portion 50) is inserted into a mandrel 72, and a die 71 for compression molding the head member 40 is attached to one end of the mandrel 72. That is, the cylindrical body portion (body portion 50), which has been molded into a cylindrical shape in advance, is inserted into the mandrel 72, whose tip portion serves as a core for compression molding the head member 40, and is then advanced to a predetermined position into the cavity of the die 71 for molding the head member 40.

[0087] Next, molten resin is supplied from a resin supply device into the metal mold 71 to compression mold the head member 40. In this case, the opening of one end of the body portion 50 is inserted into the metal mold 71 to mold the head member 40, and at the same time, the cylindrical body portion 50 is fused integrally to the head member 40. Thereafter, the integrated head member 40 and body portion 50 are removed from the metal mold 71 and mandrel 72 to obtain a tube container 10 as shown in Fig. 8(b).

[0088] Furthermore, the cap 20 is produced by injection molding using an injection molding machine (not shown). Then, the cap 20 is screwed onto the mouth of the head member 40 of the tube container 10, thereby obtaining the tube container 10.

[0089] In the present disclosure, the tube container 10 manufactured as described above can be filled with the contents to be packed through the opening at the lower end, and then the opening can be heat-sealed to form a bottom weld, thereby producing a tube package (packaged product).

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

[0091] When the tube container 10A filled with contents is to be disposed of after use, by bringing the upper body 50a and the lower body 50b (laminated portions of the outer layer 1 and the inner layer 2) closer to each other (pushing one toward the other), the inner layer 2 sandwiched between the upper body 50a and the lower body 50b of the tube container 10B can be deformed. This reduces the distance between the end faces of the upper body 50a and the lower body 50b, thereby reducing the volume of waste from the tube container 10B.

[0092] Next, a specific example of the above embodiment will be described.

[0093] Example 1 First, a beautiful pattern print layer was formed on the inner surface of a biaxially oriented polyethylene terephthalate film (thickness 12 μm) for the base layer 58 using a polyurethane gravure ink.

[0094] Next, a polyurethane adhesive for dry lamination (a two-component curing urethane adhesive with a base material: polyester resin and a curing agent: aliphatic polyisocyanate) was applied at a rate of 4 g / m2 to the outer surface of the biaxially oriented polyethylene terephthalate film by roll coating to form a first adhesive layer 57a. 2 After coating and drying, a linear low density polyethylene (LLDPE) film having a thickness of 130 μm was laminated for the first sealant layer 56 and bonded.

[0095] Next, a polyurethane adhesive for dry lamination was applied at a rate of 4 g / m2 as a second adhesive layer 57b to the inner surface of the laminated film on the side of the base layer 58. 2 After coating and drying, an aluminum foil of 9 μm was laminated for the light-shielding barrier layer 60 by dry lamination to obtain a base sheet for the outer layer 1 .

[0096] (Outer layer) 1st sealant 56 LLDPE film (130 μm) / adhesive layer DL adhesive / base layer 58 Biaxially oriented polyethylene terephthalate film (12 μm) / picture print layer / adhesive layer DL adhesive / light-shielding barrier layer 60 Aluminum foil 9 μm

[0097] On the other hand, a silicone compound coating agent ("Polycoat P-91" manufactured by DIC Corporation) was applied at a rate of 4 g / m for the easy peeling layer 52 to the surface of a linear low density polyethylene (LLDPE) film having a thickness of 130 μm for the second sealant layer 59 by a roll coating method. 2 After coating and drying, a base sheet for the inner layer 2 was obtained. The layer structure was as follows.

[0098] (Inner layer) Easy peel layer 52 Silicone compound coating layer / 2nd sealant layer 59 LLDPE film (180μm)

[0099] The aluminum foil surface of the obtained outer layer 1 and the surface of the easily peelable layer 52 of the inner layer were laminated facing each other, and then thermally laminated using a heated roll with a metal plate and a silicone rubber sheet, both of which had been preheated to a temperature of 140°C, under conditions of 140°C, 0.15 MPa, and a time of 2.0 seconds.

[0100] Using the laminated sheet 55 for tube containers obtained above, the region where the outer layer 1 is to be peeled off was irradiated with carbon dioxide gas laser light from the side that would become the outside of the container, and two parallel dotted first and second cut lines 13a and 13b (with a 0.7 mm interval between each cut and a 0.7 mm dimension between each joint) were formed at a portion (first cut line 13a) 5.0 mm below the position that would be joined to the head member of the body of the tube container and at a portion (second cut line 13b) 10.0 mm above the position that would be the bottom side of the body. The layer structure is as follows. The first cut line 13a and the second cut line 13b were formed from the side that would become the outside of the container to a depth that penetrated the base layer. The layer structure of the laminated sheet 55 for tube containers is as follows.

[0101] (Outer surface) 1st sealant layer 56 LLDPE film (130 μm) / Adhesive layer DL adhesive / Base material layer 58 Biaxially oriented polyethylene terephthalate film (12 μm) / Picture print layer / Adhesive layer DL adhesive / Light-shielding barrier layer 60 Aluminum foil 9 μm / Easy-peel layer 52 Silicone compound coating layer / 2nd sealant layer 59 LLDPE film (180 μm) (Inner surface)

[0102] Next, using the laminate sheet 55 for tube containers, one side edge portion and the other side edge portion were overlapped using a mandrel to form a tube shape, and the back layer and front layer of the laminate sheet 55 for tube containers at the overlapping portion were welded by a thermal welding method to obtain the body portion 50.

[0103] Subsequently, a head member with a check valve was integrally molded with this cylindrical molded body by insert injection molding to obtain a tube container 10 according to Example 1 of the present disclosure. High density polyethylene (HDPE) was used as the material for the head member.

[0104] In this manner, the tube container 10 was produced.

[0105] In parallel with the production of the tube container 10, the cap 20 was produced by injection molding. The obtained cap 20 was then screwed onto the mouth of the head member 40 of the tube container, thereby producing the tube container 10 with the cap.

[0106] This capped tube container 10, even when filled with 180 g of hair treatment, does not have the outer layer 1 and inner layer 2 peeled off during processing of the laminate sheet 55 for the tube container, and after using the tube container 10A filled with the content C, the first cut line 13a and the second cut line 13b can be cut off to reduce the distance between the end faces of the upper body portion 50a and the lower body portion 50b, thereby reducing the volume of waste in the tube container 10A.

[0107] Example 2 As the raw material for the inner layer 2, a 30 μm-thick linear low-density polyethylene film for the intermediate layer 61 is coated with a silicone compound coating agent ("Polycoat P-91" manufactured by DIC Corporation) at a rate of 4 g / m by roll coating on the surface of the film. 2A laminate sheet 55 for tube containers was obtained in the same manner as in Example 1, except that the oil barrier layer 62 was changed to a 15 μm ethylene-vinyl alcohol copolymer, and a capped tube container 10A (Example 2) filled with contents was produced. Then, peeling at the joint between the outer layer 1 and the inner layer 2 was confirmed in the same manner as in Example 1. The layer structure and thickness of each layer of this laminate sheet 55 for tube containers are as follows.

[0108] (Outer surface) First sealant layer 56 LLDPE film (130 μm) / Adhesive layer DL adhesive / Base material layer 58 Biaxially oriented polyethylene terephthalate film (12 μm) / Picture print layer / Adhesive layer DL adhesive / Light-shielding barrier layer 60 Aluminum foil 9 μm / Easy-peel layer 52 Silicone compound coating layer / Intermediate layer 61 Linear low-density polyethylene film (30 μm) / Oil barrier layer 62 Ethylene-vinyl alcohol copolymer (15 μm) / Second sealant layer 59 LLDPE film (180 μm) (Inner surface)

[0109] Example 3 Except for providing the half-cut first and second cut lines 13a and 13b, a laminated sheet 55 for tube containers was obtained in the same manner as in Example 1, and a tube container 10A with a cap filled with contents (Example 3) was produced. Then, in the same manner as in Example 1, peeling at the joint between the outer layer 1 and the inner layer 2 was confirmed.

[0110] Comparative Example 1 Instead of aluminum foil, an aluminum-deposited PET film (12 μm) was used for the light-shielding barrier layer, and 4 g / m of polyurethane adhesive for dry lamination (base: polyester resin, hardener: aliphatic polyisocyanate, two-component curing urethane adhesive) was applied between the second sealant layer and the light-shielding barrier layer, and between the outer layer and the inner layer. 2A tube container with a cap (Comparative Example 1) filled with a content was produced in the same manner as in Example 1, except that the coating and drying were followed by lamination. Then, peeling at the joint between the outer layer and the inner layer was confirmed in the same manner as in Example 1. The layer structure and thickness of each layer of this laminated sheet 55 for tube containers are as follows.

[0111] (Outer surface) First sealant LLDPE film (130 μm) / Adhesive layer DL adhesive / Base layer Biaxially oriented polyethylene terephthalate film (12 μm) / Picture print layer / Adhesive layer DL adhesive / Light-shielding barrier layer Aluminum-deposited PET film (12 μm) / Adhesive layer DL adhesive / Second sealant layer LLDPE film (180 μm) (Inner surface)

[0112] [Peel strength test 1] The laminated sheet 55 for tube containers in the embodiment obtained above was cut into strips of 15 mm x 100 mm, and the laminate strength between the outer layer 1 and the inner layer 2 was measured by T-shaped peeling using a tensile tester in accordance with JISK6854-2. That is, the non-laminated part was opened and held in a T-shape, and the tensile force applied to the laminated part when it peeled off was taken as the laminate strength. The peeling speed was 50 mm / min, and the average value of the tensile stress in the stable region was measured (measurements were repeated 3 times). The results are shown in Table 1.

[0113] [Table 1]

[0114] As can be seen from Table 1, the laminate sheets 55 for tube containers in Examples 1 to 3 peeled between the outer layer 1 and the inner layer 2 with a tensile strength of 0.7 N / 15 mm to 1.2 N / 15 mm, while the laminate sheet 55 for tube containers in Comparative Example 1 peeled between the outer layer 1 and the inner layer 2 with a tensile strength of 6.0 N / 15 mm.

[0115] [Peel strength test 2] In addition, the outer sealant layer and the inner sealant layer were overlapped on the side portion of the laminate sheet 55 for tube containers in Examples 1 to 3 and Comparative Example 1 so that the first sealant layer on the outer side of the laminate sheet 55 for tube containers was on the outside, and the opposing surfaces were impulse sealed to produce a cylindrical body portion (body portion 50). Next, high density polyethylene was compression molded into one opening of the cylindrical body (body 50), and the head including the shoulder and mouth was joined to produce the tube container 10 of the present invention. Next, 150 g of toothpaste was filled into each tube container from the bottom, and the bottom seal portion 17 was then heat sealed to produce a tube container A filled with the contents. After the content C was extruded from the tube container 10A, the outer layer 1 was peeled off by hand along the first cut line 13a and the second cut line 13b. The results of evaluation according to the following evaluation criteria are shown in Table 2.

[0116] [Evaluation Criteria] ○: Outer layer 1 can be peeled off by hand ×: Outer layer 1 cannot be peeled off by hand

[0117] [Table 2]

[0118] As can be seen from Table 2, in the tube containers 10 of Examples 1 to 3, the outer layer 1 and the inner layer 2 easily peeled off from each other, whereas in the tube container 10 of Comparative Example 1, the outer layer 1 and the inner layer 2 did not peel off from each other. [Explanation of symbols]

[0119] 1 outer layer 2. Inner layer 2a Ruled line (groove) 10 Tube container 10A Tube container filled with contents 10B Tube container with part of the outer layer cut off 11 Mouth 12 Shoulder 13 Break Line 13a First Break Line (Break Line) 13b 2nd break line (break line) 14 Notch 16 Opening 17 Bottom seal 18 Side seal part 20 Cap 40 Head Component 50 Torso 52 Easy peeling layer 55 Laminated sheet for tube containers 56 First sealant layer 57a 1st adhesive layer 57b 2nd adhesive layer 58 Base material layer 59 Second sealant layer 60 Light-shielding barrier layer 61 Middle Class 62 Oil Barrier Layer 71 Mold 72 Mandrel

Claims

1. a cylindrical body member formed by overlapping and joining opposing ends of the laminated sheet for tube containers to each other; a head member joined to one end of the cylindrical body member, The head member is a tube container including a shoulder portion and a mouth portion, The laminate sheet for tube containers includes an outer layer and an inner layer arranged in this order from the outer surface to the inner surface, The outer layer includes, in order from the outer surface, a first sealant layer and a base layer, the outer layer includes a score line and the inner layer includes a second sealant layer; The tube container according to claim 1, wherein the inner layer has an easily peelable layer on a surface in contact with the outer layer.

2. 2. The tube container according to claim 1, wherein the outer layer further comprises a light-shielding barrier layer on a surface side in contact with the inner layer.

3. 3. The tube container according to claim 1, wherein the inner layer further comprises an oil barrier layer.

4. 4. The tube container according to claim 1, wherein the base layer is a biaxially oriented film.

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