Tube container packaging material, tube container, and tube container provided with cap

Abstract

To provide a tube container packaging material capable of improving a recycling property, and to provide a tube container and a tube container provided with a cap thereof.SOLUTION: A tube container packaging material 10 comprises: a body part 20; and a label 30 for covering the body part 20 over an entire periphery thereof, that is provided so as to be closely attached to an outer side of the body part 20 in a peelable manner. The label 30 comprises a label base material layer 31, a printing layer 32, and a seal layer 33 that are sequentially arranged toward an inner face 102 from an outer face 101. The label base material layer 31 contains polyethylene, polypropylene, polyethylene terephthalate, or nylon. The seal layer 33 exhibiting an easy-peeling property comprises a sea-island structure containing polyethylene of which a sea 33a is made, and polypropylene of which islands 33b each are made. The label 30 comprises a non-adhesive area 30a superposed without attaching facing edge parts to each other in a circumferential direction. The non-adhesive area 30a has a width W of 2 mm or more.SELECTED DRAWING: Figure 2A

Description

Technical Field

[0001] The present disclosure relates to a packaging material for a tube container, a tube container, and a tube container with a cap.

Background Art

[0002] Conventionally, as a tube container, a laminated tube container is known (see Patent Document 1). Generally, a laminated tube container uses materials having different melting points such as polyethylene and polyethylene terephthalate. For this reason, it may be difficult to recycle a laminated tube container.

[0003] On the other hand, as a laminated tube container having recyclability, a monomaterial laminated tube container using polyethylene is known (see Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, even if it is a monomaterial container, ink or the like is usually used for the container. Thus, when ink is used for the container, the recyclability may decrease. For this reason, in a tube container, it may be required to further improve the recyclability.

[0006] The present disclosure has been made in consideration of such points, and an object thereof is to provide a packaging material for a tube container, a tube container, and a tube container with a cap capable of improving recyclability.

Means for Solving the Problem

[0007] Embodiments of the present disclosure relate to the following [1] to

[11] .

[0008] [1] In a packaging material for a tube container, a main body portion, and a label that is detachably adhered to the outside of the main body portion and covers the main body portion over the entire circumference. The label has a label base material layer, a printing layer, and a seal layer that are arranged in order from the outer surface toward the inner surface. The label base material layer includes polyethylene, polypropylene, polyethylene terephthalate, or nylon. The seal layer has easy peelability and has a sea-island structure in which polyethylene is the sea and polypropylene is the island. The label has an unadhered region in which opposing edges in the circumferential direction are overlapped without being adhered to each other. A packaging material for a tube container, wherein the width of the unadhered region is 2 mm or more.

[0009] [2] The packaging material for a tube container according to [1], wherein the label further has a barrier layer provided on the label base material layer.

[0010] [3] The main body portion has a first sealant layer and a second sealant layer that are arranged in order from the outer surface toward the inner surface. The packaging material for a tube container according to [1] or [2], wherein at least 90% or more of the main body portion is made of the same resin-based material.

[0011] [4] The packaging material for a tube container according to [3], wherein the first sealant layer and the second sealant layer each contain milky white polyethylene.

[0012] [5] The first sealant layer is a packaging material for a tube container according to [3] or [4], which contains an antistatic agent.

[0013] [6] The density of the first sealant layer and the density of the second sealant layer are respectively 0.90 kg / cm 3 or more and 0.93 kg / cm 3 or less. The packaging material for a tube container according to any one of [3] to [5].

[0014] [7] The main body portion further has a main body base material layer provided between the first sealant layer and the second sealant layer. The packaging material for a tube container according to any one of [3] to [6].

[0015] [8] In a tube container, a body tube formed by overlapping and joining the opposing edge portions of the main body portion of the packaging material for a tube container according to any one of [1] to [7], and a head member joined to one end of the body tube. A tube container comprising.

[0016] [9] The head member contains polyethylene. The tube container according to [8].

[0017]

[10] In a capped tube container, the tube container according to [8] or [9], and a cap attached to the head member. A capped tube container comprising.

[0018]

[11] The cap contains polyethylene. The capped tube container according to

[10] . [Advantages of the Invention]

[0019] According to the present disclosure, the recyclability of a tube container and a capped tube container can be improved.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2A

Figure 2B

Figure 2C

Figure 3A

Figure 3B

Figure 4A

Figure 4B

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0021] Hereinafter, an embodiment will be described with reference to the drawings. FIGS. 1 to 8 are diagrams showing an embodiment. Each of the diagrams shown below is a schematically shown diagram. Therefore, the size and shape of each part are appropriately exaggerated for easy understanding. Also, it can be implemented with appropriate changes without departing from the technical idea. In each of the diagrams shown below, the same parts are denoted by the same reference numerals, and some detailed descriptions may be omitted. Also, the numerical values such as the dimensions of each member described in this specification and the material names are examples as an embodiment, and are not limited thereto, and can be appropriately selected and used. In this specification, terms specifying shapes and geometric conditions, such as terms such as parallel, orthogonal, and perpendicular, are to be interpreted to include not only the strictly meant meaning but also substantially the same state.

[0022] As shown in FIG. 1, the capped tube container 40A according to this embodiment includes a tube container 40 and a cap 49 attached to a head member 43 (to be described later) of the tube container 40.

[0023] Among these, the tube container 40 includes a body tube 41 that is a laminated tube and a head member 43 joined to one end 42 of the body tube 41. The body tube 41 has a substantially cylindrical shape as a whole. This body tube 41 is composed of a packaging material 10 for tube containers to be described later. In this case, the body tube 41 may be configured such that the outer surface 101 of the packaging material 10 for tube containers faces the side opposite to the content side and the inner surface 102 faces the content side.

[0024] The body tube 41 has a body seal portion 44 that joins the packaging materials 10 for tube containers to each other. This body seal portion 44 is formed along the longitudinal direction of the body tube 41. Such a body tube 41 may be obtained, for example, by rolling the packaging material 10 for tube containers into a cylindrical shape and overlapping the opposing edge portions of the main body portion 20 (to be described later) of the packaging material 10 for tube containers and joining them to each other by, for example, heat sealing.

[0025] Further, the body tube 41 has a bottom seal portion 45 that joins the packaging materials 10 for the tube container to each other. This bottom seal portion 45 is a portion where the packaging materials for the tube container near the opening are joined to each other after an appropriate amount of the content C is filled from an opening (not shown) formed at the other end 46 of the body tube 41.

[0026] The head member 43 has a shoulder portion 47 and a mouth portion 48. A cap 49 is adapted to be attached to the mouth portion 48. The head member 43 is formed, for example, by a compression molding method. Further, the head member 43 is made of a resin material such as high-density polyethylene (HDPE), for example. Also, the head member 43 and the cap 49 may contain polyethylene, for example. Thereby, in the capped tube container 40A, since it is possible to achieve a single materialization including the body tube 41, the head member 43, and the cap 49, the recycling efficiency can be improved.

[0027] Next, the packaging material 10 for the tube container will be described.

[0028] As shown in FIGS. 1 and 2A, the packaging material 10 for the tube container includes a main body portion 20 and a label 30 that is detachably adhered to the outside of the main body portion 20 and covers the main body portion 20 over the entire circumference. In the present embodiment, the label 30 covers the entire area of the main body portion 20. In the example shown in FIG. 2A, one end of the label 30 in the circumferential direction is in contact with one end of the main body portion 20 in the circumferential direction. However, it is not limited to this, and as shown in FIGS. 2B and 2C, one end of the label 30 in the circumferential direction may not be in contact with one end of the main body portion 20 in the circumferential direction.

[0029] Further, the label 30 has an unbonded area 30a where the opposing edges in the circumferential direction are overlapped without being bonded to each other. The width W (circumferential distance) of this unbonded area 30a is 2 mm or more. Since the label 30 has the unbonded area 30a, for example, when a consumer peels the label 30 from the main body 20, the consumer can easily peel the label 30 from the main body 20 by sandwiching the unbonded area 30a. For this reason, the main body 20 can be recycled from the tube container 40. Note that the width W of the unbonded area 30a may be 3 mm or less.

[0030] Next, the layer structure of the main body 20 and the label 30 will be described. Here, first, the layer structure of the main body 20 will be described.

[0031] <Layer structure of the main body> FIGS. 3A and 3B show an example of the layer structure of the main body 20 of the packaging material 10 for a tube container. As shown in FIGS. 3A and 3B, the main body 20 has a first sealant layer 11 and a second sealant layer 12 arranged in this order from the outer surface 101 toward the inner surface 102. Further, as shown in FIG. 3B, the main body 20 may further have a main body base material layer 13 provided between the first sealant layer 11 and the second sealant layer 12.

[0032] Specifically, as shown in FIG. 3A, the main body 20 includes a first sealant layer 11, a first adhesive layer 14a, and a second sealant layer 12 in this order.

[0033] Also, as shown in FIG. 3B, the main body 20 includes a first sealant layer 11, a first adhesive layer 14a, a main body base material layer 13, a second adhesive layer 14b, and a second sealant layer 12 in this order.

[0034] In the examples shown in FIGS. 3A and 3B, the first sealant layer 11 adheres to the label 30, and the second sealant layer 12 constitutes the inner surface 102 of the packaging material 10 for a tube container.

[0035] Hereinafter, each layer of the main body 20 of the packaging material 10 for the tube container will be described.

[0036] <<First Sealant Layer and Second Sealant Layer>> The first sealant layer 11 and the second sealant layer 12 are layers for adhering the packaging materials 10 for the tube containers to each other. As the materials constituting the first sealant layer 11 and the second sealant layer 12, any material that melts and fuses by heat may be used. For the first sealant layer 11 and the second sealant layer 12, for example, a polyolefin film can be used. More specifically, as the first sealant layer 11 and the second sealant layer 12, for example, a low-density polyethylene (LDPE) film, a medium-density polyethylene (MDPE) film, a high-density polyethylene (HDPE) film, a linear (linear) low-density polyethylene (LLDPE) film, a polypropylene film, a polyolefin resin such as polyethylene or polypropylene modified with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, and other unsaturated carboxylic acids, an acid-modified polyolefin resin film, a polyvinyl acetate resin film, a polyester resin film, a polystyrene resin film, a polyacrylonitrile, a saturated polyester, a film made of one or more other resins such as polyvinyl alcohol can be used.

[0037] Here, low-density polyethylene has a density of 910 kg / m 3 or more and 930 kg / m 3 or less. Medium-density polyethylene has a density of 930 kg / m 3 or more and 942 kg / m 3 or less. Further, high-density polyethylene has a density of 942 kg / m 3 or more. Low-density polyethylene can be obtained, for example, by polymerizing ethylene at a high pressure of 1000 atmospheres or more and less than 2000 atmospheres. Medium-density polyethylene and high-density polyethylene can be obtained, for example, by polymerizing ethylene at a medium pressure or low pressure of 1 atmosphere or more and less than 1000 atmospheres.

[0038] In addition, medium-density polyethylene and high-density polyethylene may partially contain a copolymer of ethylene and an α-olefin. Further, even when ethylene is polymerized at medium pressure or low pressure, when a copolymer of ethylene and an α-olefin is included, medium-density or low-density polyethylene can be produced. The linear low-density polyethylene described above is such a polyethylene. Linear low-density polyethylene is obtained by copolymerizing an α-olefin with a linear polymer obtained by polymerizing ethylene at medium pressure or low pressure to introduce short-chain branches. Examples of α-olefins include 1-butene (C 4 ), 1-hexene (C 6 ), 4-methylpentene (C 6 ), 1-octene (C 8 ), and the like. The density of linear low-density polyethylene is, for example, 915 kg / m 3 or more and 945 kg / m 3 or less.

[0039] The first sealant layer 11 may contain polyethylene or may contain linear low-density polyethylene. In this case, the second sealant layer 12 may also contain polyethylene or may contain linear low-density polyethylene. When the first sealant layer 11 contains linear low-density polyethylene, the bonding property between the first sealant layer 11 and the second sealant layer 12 can be improved when the first sealant layer 11 and the second sealant layer 12 are joined to each other. As the linear low-density polyethylene, for example, Ultzex (registered trademark), 2021I (product name) manufactured by Prime Polymer Co., Ltd., Ultzex (registered trademark), 3520L (product name) manufactured by Prime Polymer Co., Ltd., Kernel (registered trademark), KMB-16F (product name) manufactured by Nippon Polyethylene Co., Ltd. can be used.

[0040] Also, in this case, the first sealant layer 11 and the second sealant layer 12 may each contain milky white polyethylene. Thereby, concealment and whiteness can be ensured without using white ink.

[0041] Also, the density of the first sealant layer 11 and the density of the second sealant layer 12 may each be 0.90 kg / cm 3 or more and 0.93 kg / cm 3 or less. When the density of the first sealant layer 11 is 0.91 kg / cm 3 or more, low-temperature sealability can be ensured. Also, when the density of the first sealant layer 11 is 0.93 kg / cm 3 or less, heat resistance can be ensured. When the density of the second sealant layer 12 is 0.91 kg / cm 3 or more, low-temperature sealability can be ensured. Furthermore, when the density of the second sealant layer 12 is 0.93 kg / cm 3 or less, heat resistance can be ensured.

[0042] Furthermore, the first sealant layer 11 may contain an antistatic agent. This makes it easier to peel off the label.

[0043] In this embodiment, as the above heat-sealable film, for example, one or more of the above resins are used as the main component, and a desired additive is arbitrarily added thereto to prepare a resin composition. Then, using the resin composition prepared above, a film or sheet can be formed by, for example, the T-die method, the inflation method, or other molding methods.

[0044] Note that, as the materials of the first sealant layer 11 and the second sealant layer 12 described above, for example, those obtained by arbitrarily adding an antiblocking agent, a lubricant (such as fatty acid amide), a flame retardant, an inorganic or organic filler, etc. may be used.

[0045] Also, in this embodiment, the thicknesses of the first sealant layer 11 and the second sealant layer 12 are each preferably 50 μm or more and 250 μm or less.

[0046] <<Body base material layer>> The main body base material layer 13 is a layer for supporting, for example, the first sealant layer 11 and the second sealant layer 12 and enhancing the strength of the entire packaging material 10 for the tube container. As the material constituting the main body base material layer 13, for example, polyester-based resins, polyamide-based resins, polyaramide-based resins, polyolefin-based resins, polycarbonate-based resins, polyacetal-based resins, fluorine-based resins, films or sheets of other tough resins, etc. can be used. As an example, the main body base material layer 13 may not contain polyethylene terephthalate or aluminum foil. Also, the main body base material layer 13 may contain polyethylene terephthalate. As the polyolefin-based resin, for example, films of extruded low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene can be used.

[0047] Also, as the films or sheets of the above-mentioned resins, any of unstretched films, or stretched films stretched in one axial direction or two axial directions, etc. can be used. Among them, in the present embodiment, a biaxially stretched polyester-based resin film is preferable because it is excellent in terms of printability.

[0048] In the present embodiment, the thickness of the main body base material layer 13 is preferably 10 μm or more and 25 μm or less.

[0049] <<Adhesive layer>> Adhesive layers such as the first adhesive layer 14a and the second adhesive layer 14b are layers for adhering the first sealant layer 11, the main body base material layer 13, the second sealant layer 12, etc. to each other. The material used for this adhesive layer can be appropriately selected according to the resin constituting the layer to be adhered.

[0050] As the 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 adhesives for laminating can be arbitrarily used.

[0051] In addition, as the adhesive layer, for example, polyethylene, polypropylene, linear low-density polyethylene, ethylene-vinyl alcohol, ethylene-methacrylic acid copolymer (EMAA), ethylene-acrylic acid copolymer, ionomer, maleic anhydride-modified polyolefin resin, etc. can be preferably used.

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

[0053] In addition, as a method of laminating the first sealant layer 11, the main body base material layer 13, the second sealant layer 12, etc. with each other, for example, a wet lamination method, a dry lamination method, a solventless dry lamination method, an extrusion lamination method, a T-die co-extrusion molding method, a co-extrusion lamination method, an inflation method, or any other method can be used. Further, when performing the above-described lamination, if necessary, pretreatment such as corona treatment or ozone treatment can be applied to the film.

[0054] <<Other Layers>> As other layers, for example, an intermediate layer or a shielding layer may be provided. The intermediate layer is a layer for supporting the first sealant layer 11 and the second sealant layer 12 and enhancing the strength of the entire packaging material 10 for the tube container. The intermediate layer may be made of the same material as the main body base material layer 13.

[0055] In addition, the shielding layer is a layer for preventing the color change or variation of the intermediate layer or the like from affecting the color of the pattern or the like of the printing layer. An olefin resin can be used for the shielding layer. More specifically, as the shielding layer, a polyethylene film such as low-density polyethylene, linear low-density polyethylene, or medium-density polyethylene is preferably used. These polyethylene films may be colored, for example, like an opaque polyethylene film. The thickness of the shielding layer is preferably, for example, 50 μm or more and 200 μm.

[0056] In such a main body 20, at least 90% or more is made of the same resin-based (polyolefin-based) material. In this case, the main body 20 of the packaging material 10 for the tube container can be classified as a so-called single-material, and the recyclability of the main body 20 can be improved. Here, for example, as polyethylene, high-density polyethylene and linear low-density polyethylene are exemplified. These high-density polyethylene and linear low-density polyethylene are classified as "materials of the same resin-based" in this specification. On the other hand, for example, polyethylene and polyester are not classified as materials of the same resin-based.

[0057] <Label layer structure> FIGS. 4A and 4B show an example of the layer structure of the label 30 of the packaging material 10 for the tube container. As shown in FIGS. 4A and 4B, the label 30 has a label base material layer 31, a printing layer 32, and a seal layer 33, which are arranged in order from the outer surface 101 to the inner surface 102. Further, as shown in FIG. 4B, the label 30 may further have a barrier layer 34 provided on the label base material layer 31.

[0058] Specifically, as shown in FIG. 4A, the label 30 includes a label base material layer 31, a printing layer 32, an adhesive layer 35, and a seal layer 33 in this order.

[0059] Further, as shown in FIG. 4B, the label 30 includes a label base material layer 31, a barrier layer 34, a printing layer 32, an adhesive layer 35, and a seal layer 33 in this order.

[0060] In the examples shown in FIGS. 4A and 4B, the label base material layer 31 constitutes the outer surface 101 of the packaging material 10 for the tube container, and the seal layer 33 adheres to the main body 20.

[0061] Hereinafter, each layer of the label 30 of the packaging material 10 for the tube container will be described.

[0062] <<Label base material layer>> The label base material layer 31 is, for example, a layer for supporting the seal layer 33 and enhancing the strength of the entire label 30. The label base material layer 31 may be composed of the same material as the main body base material layer 13 described above. As an example, the label base material layer 31 may contain polyethylene, polypropylene, polyethylene terephthalate, or nylon.

[0063] In this embodiment, the thickness of the label base material layer 31 is preferably 10 μm or more and 25 μm or less.

[0064] <<Seal layer>> The seal layer 33 is a layer for adhering the label 30 to the main body portion 20. The seal layer 33 has easy peelability. In this case, when the seal layer 33 is observed with a microscope from the inner surface 102 side, the sea-island structure described later can be confirmed. The adhesive strength between the label 30 and the main body portion 20 shall be measured in accordance with JIS Z 0238:1998. At this time, for a sample cut into a strip shape with a width of 15 mm, a 90° peel test is performed using a tensile tester (manufactured by Orientec Co., Ltd., Tensilon universal material testing machine: RTC1310A) at a peel rate of 300 mm / min to measure the adhesive strength.

[0065] Also, as shown in FIG. 5, the seal layer 33 contains polyethylene, which is the main component, and polypropylene. The types of layers having easy peelability are roughly classified into an interfacial peeling type, an interlayer peeling type, or an agglomeration peeling type depending on the difference in the peeling mechanism. Among these, the agglomeration peeling type is a type in which the resin contained in the layer causes internal agglomeration failure during peeling, thereby exhibiting easy peelability. Polypropylene contained in the seal layer 33 is substantially incompatible with polyethylene, and a mixture of these forms a so-called "sea-island structure" in which the main component polyethylene forms "sea 33a" and polypropylene forms "island 33b". Then, due to the "sea-island structure", the cohesive force of the seal layer 33 is reduced. As a result, when the label 30 is peeled from the main body 20, agglomeration failure can be caused, and the label 30 can exhibit easy peelability of the agglomeration peeling type. Note that the main component means a component exceeding 50% by mass among the components contained in the layer.

[0066] The polyethylene contained in the seal layer 33 may be low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), or linear (linear) low-density polyethylene (LLDPE).

[0067] In addition, for example, an antiblocking agent, a lubricant (such as fatty acid amide), a flame retardant, an inorganic or organic filler, etc. may be optionally added to the above-described seal layer 33.

[0068] Also, in the present embodiment, the thickness of the seal layer 33 is preferably 50 μm or more and 250 μm or less.

[0069] <<Printing layer>> The printing layer 32 is a layer on which patterns and the like are printed, and is a layer for improving the design property of the packaging material 10 for the tube container. As the printing layer 32, one or more kinds of ordinary ink vehicles are used as the main component. If necessary, one or more kinds of plasticizers, stabilizers, antioxidants, light stabilizers, ultraviolet absorbers, curing agents, crosslinking agents, lubricants, antistatic agents, fillers, and other additives are arbitrarily added. Further, a colorant such as a dye or a pigment is added, and an ink composition obtained by sufficiently kneading with a solvent, a diluent, etc. can be used. As such an ink vehicle, for example, one or more of linseed oil, tung oil, soybean oil, hydrocarbon oil, rosin, rosin ester, rosin-modified resin, shellac, alkyd resin, phenolic resin, maleic acid resin, natural resin, hydrocarbon resin, polyvinyl chloride 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, amino alkyd resin, nitrocellulose, ethyl cellulose, chlorinated rubber, cyclized rubber, and others can be used in combination. The printing method may be, in addition to gravure printing, letterpress printing, screen printing, transfer printing, flexographic printing, or other printing methods.

[0070] <<Barrier layer>> The barrier layer 34 is a layer for suppressing the permeation of oxygen gas, water vapor, etc. As the barrier layer 34, for example, a gas barrier material against oxygen gas, water vapor, etc., a light-shielding material against sunlight, etc., or a material having fragrance retention against the contents can be used. As the barrier layer 34, for example, aluminum foil, tin, lead, copper, iron, nickel, or an alloy thereof, etc., or a thin metal vapor deposition layer of aluminum or the like can be used. When using aluminum foil as the barrier layer 34, the thickness of the barrier layer 34 can be about 5 μm or more and 20 μm or less.

[0071] Also, when using a metal vapor deposition layer such as aluminum as the barrier layer 34, for example, physical vapor deposition methods such as vacuum evaporation, sputtering, ion plating, cluster ion beam method, etc. (Physical Vapor Deposition method, PVD method) can be utilized to form a vapor deposition thin film of a metal such as aluminum on the label base material layer 31.

[0072] When using an aluminum metal vapor deposition layer as the barrier layer 34, the thickness of the barrier layer 34 is usually preferably about 50 Å or more and 3000 Å or less, and particularly preferably about 100 Å or more and 2000 Å or less. Also, the surface of the label base material layer 31 that supports the above-mentioned aluminum vapor deposition thin film can be coated with, for example, a vapor deposition primer, etc. in advance to enhance the adhesion of the vapor deposition film, and other required pretreatment can be arbitrarily performed.

[0073] Also, the barrier layer 34 may be a transparent vapor deposition layer formed by a conventionally known method. In this case, the barrier layer 34 may be a transparent vapor deposition layer composed of a vapor deposition layer of an inorganic oxide.

[0074] As the transparent vapor deposition layer, for example, vapor deposition layers of oxides such as silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y), etc. can be used. In particular, for tube containers, it is preferable to have a vapor deposition layer of aluminum oxide or silicon oxide.

[0075] The notation of inorganic oxides is, for example, SiO X , AlO X and so on like MO X(However, in the formula, M represents an inorganic element, and the value of X varies depending on the inorganic element.) It is represented by. As the range of the value of X, for silicon (Si), it is 0 to 2, for aluminum (Al), it is 0 to 1.5, for magnesium (Mg), it is 0 to 1, for calcium (Ca), it is 0 to 1, for potassium (K), it is 0 to 0.5, for tin (Sn), it is 0 to 2, for sodium (Na), it is 0 to 0.5, for boron (B), it is 0 to 1.5, for titanium (Ti), it is 0 to 2, for lead (Pb), it is 0 to 2, for zirconium (Zr), it is 0 to 2, and for yttrium (Y), it can take values in the range of 0 to 1.5. In the above, when X = 0, it is a complete inorganic simple substance (pure substance), which is not transparent, and the upper limit of the range of X is the value after complete oxidation. For packaging materials, silicon (Si) and aluminum (Al) are preferably used, and those with values in the range of 1.0 to 2.0 for silicon (Si) and 0.5 to 1.5 for aluminum (Al) can be used.

[0076] The thickness of the transparent vapor deposition layer varies depending on the type of inorganic oxide used, etc. For example, it is preferably formed by arbitrarily selecting within the range of 50 Å or more and 2000 Å or less, more preferably 100 Å or more and 1000 Å or less. For example, in the case of a vapor deposition layer of aluminum oxide or silicon oxide, a thickness of 50 Å or more and 500 Å or less, and more preferably 100 Å or more and 300 Å or less is desirable.

[0077] The transparent vapor deposition layer can be formed on the label base material layer 31 using the following formation method. As the formation method of the vapor deposition layer, for example, physical vapor deposition methods such as vacuum vapor deposition method, sputtering method, and ion plating method (Physical Vapor Deposition method, PVD method), or chemical vapor deposition methods such as plasma chemical vapor deposition method, thermal chemical vapor deposition method, and photo chemical vapor deposition method (Chemical Vapor Deposition method, CVD method), etc. can be mentioned. Specifically, using a roller-type vapor deposition layer forming device, the vapor deposition layer can be formed on the forming roller.

[0078] <<Adhesive layer>> The adhesive layer 35 is a layer for adhering the label base material layer 31, the seal layer 33, etc. to each other. The material used for this adhesive layer can be appropriately selected according to the resin constituting the layer to be adhered.

[0079] The adhesive layer may be composed of the same material as the above-described first adhesive layer 14a, etc., and may be formed by the same method as the above-described first adhesive layer 14a, etc.

[0080] In this embodiment, the thickness of the adhesive layer is preferably 3 μm or more and 60 μm or less.

[0081] <<Other Layers>> As other layers, for example, the above-described intermediate layer, etc. may be provided.

[0082] In the tube container 40 according to this embodiment, the joining of the body tube 41 and the head member 43 can be performed by heat welding when the head member 43 is formed by a compression molding method, as will be described later. However, it is not limited to this, and the joining of the body tube 41 and the head member 43 may be performed by an injection molding method.

[0083] Next, with reference to FIGS. 6(a)-(b), FIGS. 7(a)-(d), and FIGS. 8(a)-(b), the manufacturing method of the tube container 40 will be described.

[0084] In this case, first, as shown in FIG. 6(a), the main body portion 20 is manufactured.

[0085] When manufacturing the main body portion 20, first, as the first sealant layer 11 and the second sealant layer 12, for example, polyethylene films are prepared respectively.

[0086] Next, for example, also on the polyethylene film as the first sealant layer 11, polyethylene is melt-extruded from an extruder (not shown) to form an extruded polyethylene layer (first adhesive layer 14a). At this time, a polyethylene film as the second sealant layer 12 is bonded via the extruded polyethylene layer (first adhesive layer 14a). In this way, the main body portion 20 is obtained.

[0087] Also, as shown in FIG. 6(b), a label 30 is produced.

[0088] When producing the label 30, first, as the label base material layer 31, for example, a polyethylene terephthalate film is prepared. Also, as the sealant layer 33, for example, a polyethylene film having a sea-island structure is prepared.

[0089] Next, on the polyethylene terephthalate film as the label base material layer 31, for example, urethane-based gravure ink is applied by gravure printing, and then the ink is dried to form a printed layer 32.

[0090] Next, an adhesive is applied on the polyethylene terephthalate film as the label base material layer 31 on which the printed layer 32 is formed to form an adhesive layer (adhesive layer 35). Also, via this adhesive layer, the polyethylene terephthalate film as the label base material layer 31 and the polyethylene film as the sealant layer 33 are bonded together. In this way, the label 30 is obtained.

[0091] Next, as shown in FIGS. 7(a)-(d), using the obtained main body portion 20 and label 30, a body tube 41 (packaging material 10 for a tube container) is produced.

[0092] First, as shown in FIGS. 7(a)-(b), the main body portion 20 of the packaging material 10 for the tube container is rounded, and the opposing edge portions of the main body portion 20 are joined together, for example, by heat sealing, to form a cylindrical tube. At this time, first, as shown in FIGS. 7(a)-(b), the main body portion 20 is wound around the outer surface of the cylindrical inner seal member 80, and the opposing edge portions of the main body portion 20 are overlapped. At this time, the main body portion 20 is wound around the inner seal member 80 so that the second sealant layer 12 of the main body portion 20 faces the outer surface of the inner seal member 80. Incidentally, at this time, together with the main body portion 20, the label 30 may also be wound around the outer surface of the inner seal member 80. Further, when the opposing edge portions of the main body portion 20 are overlapped, the main body portion 20 and the label 30 are conveyed downstream (the left side in FIGS. 7(a)-(b)) by a guide roll (not shown).

[0093] Next, as shown in FIG. 7(b), the first outer seal member 81 is pressed against the portion where the opposing edge portions of the main body portion 20 are overlapped, and the inner seal member 80 and the first outer seal member 81 sandwich the portion where the opposing edge portions of the main body portion 20 are overlapped. Then, the portion where the opposing edge portions of the main body portion 20 are overlapped is joined by heat sealing.

[0094] Next, as shown in FIG. 7(c), the label 30 is rounded, and for example, by heat sealing, the label 30 is joined to the main body portion 20 to form a cylindrical tube, thereby producing the body tube 41. At this time, first, the label 30 is wound around the outer surface of the inner seal member 80 around which the main body portion 20 is wound, and the opposing edge portions of the label 30 are overlapped. At this time, the label 30 is wound around the inner seal member 80 so that the seal layer 33 of the label 30 faces the first sealant layer 11 of the main body portion 20. Also in this case, when the opposing edge portions of the label 30 are overlapped, the main body portion 20 and the label 30 are conveyed downstream (the left side in FIG. 7(c)) by a guide roll (not shown).

[0095] Next, press the second outer seal member 84 against the entire circumference of the label 30, and sandwich the label 30 and the main body 20 between the inner seal member 80 and the second outer seal member 84. Next, join the label 30 and the main body 20 by heat sealing. In this case, the label 30 and the main body 20 may be heat sealed over the entire circumference by rotating the label 30 and the main body 20 along the outer surface of the inner seal member 80. In this way, the packaging material 10 for the tube container is obtained. When joining the label 30 and the main body 20 by heat sealing, the opposing edge portions in the circumferential direction of the label 30 are overlapped. At this time, the opposing edge portions of the label 30 are overlapped so that the label base material layer 31 and the seal layer 33 face each other. For this reason, even when the label 30 and the main body 20 are sandwiched between the inner seal member 80 and the second outer seal member 84, the labels do not adhere to each other at the portion where the opposing edge portions of the label 30 are overlapped. As a result, an unadhered region 30a (see FIG. 2A etc.) is formed in the label 30.

[0096] Thereafter, cut the joined packaging material 10 for the tube container into individual body tubes 41. In this way, as shown in FIG. 7(d), the body tube 41 is produced. At this time, the speed of producing the body tube 41 may be about 50 pieces / min.

[0097] Next, using the joined packaging material 10 (body tube 41) for the tube container, manufacture the above-described tube container 40 by a compression molding method.

[0098] First, as shown in FIG. 8(a), wind this cylindrical packaging material 10 for the tube container (body tube 41) around a mandrel 82, and attach a mold 83 for compression molding of the head member 43 to one end of the mandrel 82. That is, the packaging material 10 for the tube container (body tube 41) previously formed in a cylindrical shape is wound around the mandrel 82 whose tip serves as a core for compression molding the head member 43, and is advanced to a predetermined position within the cavity of the mold 83 for molding the head member 43.

[0099] Subsequently, the head member 43 is compression-molded by supplying molten resin from a resin supply device (not shown) into the mold 83. In this case, by inserting one end 42 of the body tube 41 into the mold 83, the head member 43 is molded, and at the same time, the body tube 41 is integrally fused to the head member 43. Thereafter, the tube container 40 is obtained by taking out the integrated head member 43 and body tube 41 from the mold 83 and the mandrel 82 (see Fig. 8(b)).

[0100] Also, when manufacturing the capped tube container 40A, the cap 49 is prepared in parallel with manufacturing the tube container 40. In this case, for example, an injection molding machine (not shown) is used to produce the cap 49 by an injection molding method. Then, the cap 49 is screwed onto the mouth 48 of the head member 43 of the tube container 40, thereby obtaining the capped tube container 40A shown in Fig. 1.

[0101] Thereafter, the content is filled into the body tube 41 of the capped tube container 40A from the bottom side, and the bottom of the body tube 41 is sealed, thereby obtaining the capped tube container 40A with the content as a product.

[0102] As described above, according to the present embodiment, the packaging material 10 for the tube container includes the main body portion 20 and the label 30 that is detachably and closely attached to the outside of the main body portion 20 and covers the main body portion 20 over the entire circumference. Thereby, the main body portion 20 can be recycled by peeling the label 30 from the main body portion 20.

[0103] Also, the label 30 has a label base material layer 31, a printing layer 32, and a seal layer 33 that are arranged in order from the outer surface 101 toward the inner surface 102. Thus, since the label 30 has the printing layer 32, the body tube 41 having a high-definition pattern can be produced. Therefore, the designability of the tube container 40 can be improved.

[0104] In addition, the label base material layer 31 contains polyethylene, polypropylene, polyethylene terephthalate, or nylon. For example, when the label base material layer 31 contains polyethylene, the low-temperature sealability, transparency, etc. can be improved. Also, when the label base material layer 31 contains polyethylene terephthalate, the printability, vapor deposition suitability, etc. can be improved. Furthermore, when the label base material layer 31 contains nylon, the puncture resistance, etc. can be improved.

[0105] In addition, the seal layer 33 of the label 30 has easy peelability and has a sea-island structure in which polyethylene is the sea 33a and polypropylene is the island 33b. Thereby, the label 30 can be easily peeled from the main body portion 20. For this reason, the recyclability of the main body portion 20 can be improved.

[0106] Furthermore, the label 30 has an unbonded region 30a in which the opposing edges in the circumferential direction are overlapped without being bonded to each other, and the width W of the unbonded region 30a is 2 mm or more. Thereby, when the consumer peels the label 30 from the main body portion 20, the consumer can easily peel the label 30 from the main body portion 20 by sandwiching the unbonded region 30a.

[0107] In this way, in the present embodiment, the label 30 having designability and functionality at the time of disposal can be separated from the main body portion 20. For this reason, the main body portion 20 can be recycled as a resource. In particular, when the main body portion 20 is composed of a single material, or when the main body portion 20 does not contain ink, etc., the recyclability of the main body portion 20 becomes good. For this reason, the main body portion 20 can be reused as a high-quality resource.

[0108] Also, according to the present embodiment, the label 30 further has a barrier layer 34 provided on the label base material layer 31. Thereby, the barrier property of the tube container 40 can be improved. In this case, by thermally welding a seal member (so-called P seal) having a barrier property to the mouth portion 48 of the tube container 40, the barrier property of the tube container 40 can be further improved.

[0109] Furthermore, in the present embodiment, at least 90% or more of the main body 20 is made of the same resin-based material. This makes it easier to recycle the tube container 40 produced from the packaging material 10 for the tube container.

[0110] In the above-described embodiment, the case where the label 30 covers the entire area of the main body 20 has been described, but the present invention is not limited to this. For example, as shown in FIG. 9, the label 30 may cover only a partial area of the main body 20.

Example

[0111] Next, specific examples in the above embodiment will be described.

[0112] (Example A1) The main body shown in FIG. 3A was produced. At this time, the main body having the following layer structure was produced by the extrusion lamination method. Static prevention PEF (50 μm) / PE (30 μm) / PEF (120 μm) In the above, " / " represents the boundary between layers (the same applies hereinafter). Also, the left side is the layer on the outer surface side of the packaging material for the tube container (the same applies hereinafter). Also, "static prevention PEF" means a polyethylene film containing an antistatic agent (the same applies hereinafter). Also, "PE" means an extruded polyethylene layer as an adhesive layer (the same applies hereinafter). Furthermore, "PEF" means a polyethylene film (the same applies hereinafter).

[0113] Also, the label shown in FIG. 4A was produced. At this time, the label having the following layer structure was produced by the dry lamination method. PET (12 μm) / Printing layer / DL / PEF (30 μm) In the above, "PET" means a polyethylene terephthalate film (the same applies hereinafter). Also, "DL" means an adhesive layer by the dry lamination method (the same applies hereinafter).

[0114] Next, using the produced main body and label, as shown in Fig. 1, a tube container was produced in which the label covers the entire area of the main body. Also, using another produced main body and label, as shown in Fig. 9, a tube container was produced in which the label covers only a partial area of the main body.

[0115] Then, the design, concealment, and barrier properties of the tube container were evaluated.

[0116] Also, by peeling the label from the main body, the peelability of the label and the recyclability of the main body were confirmed.

[0117] (Example A2) Except for producing a main body with the following layer structure, in the same manner as Example A1, the design, concealment, and barrier properties of the tube container were evaluated, and the peelability of the label and the recyclability of the main body were confirmed. Static-proof PEF (50 μm) / PE (30 μm) / Opalescent PEF (120 μm) In the above, "Opalescent PEF" means an opalescent polyethylene film (the same applies hereinafter).

[0118] (Example A3) Except for producing a main body with the following layer structure, in the same manner as Example A1, the design, concealment, and barrier properties of the tube container were evaluated, and the peelability of the label and the recyclability of the main body were confirmed. Static-proof PEF (100 μm) / PE (20 μm) / EVOH-PEF (80 μm) In the above, "EVOH-PEF" means a polyethylene film containing ethylene-vinyl alcohol copolymer (EVOH) (the same applies hereinafter).

[0119] (Example A4) Except for producing a main body with the following layer structure, in the same manner as Example A1, the design, concealment, and barrier properties of the tube container were evaluated, and the peelability of the label and the recyclability of the main body were confirmed. Static protection PEF (80μm) / PE (20μm) / EVOH-PEF (80μm) / PE (30μm) / PEF (120μm)

[0120] (Example A5) A tube container body with the following layer structure was produced, and in the same manner as Example A1 except for this, the design, concealment, and barrier properties of the tube container were evaluated, and the peelability of the label and the recyclability of the body were confirmed. Static protection PEF (80μm) / PE (20μm) / EVOH-PEF (80μm) / PE (30μm) / Opalescent PEF (100μm)

[0121] (Example B1) The body shown in Fig. 3A was produced. At this time, the body with the following layer structure was produced by the extrusion lamination method. Static protection PEF (50μm) / PE (30μm) / PEF (120μm)

[0122] Also, the label shown in Fig. 4B was produced. At this time, the label with the following layer structure was produced by the dry lamination method. IB-PET (12μm) / Printing layer / DL / PEF (30μm) In the above, "IB-PET" means a polyethylene terephthalate film provided with an inorganic oxide vapor deposition layer (the same shall apply hereinafter).

[0123] Next, using the produced body and label, as shown in Fig. 1, a tube container in which the label covers the entire area of the body was produced. Also, using another produced body and label, as shown in Fig. 9, a tube container in which the label covers only a partial area of the body was produced.

[0124] Then, the design, concealment, and barrier properties of the tube container were evaluated.

[0125] Also, by peeling the label from the body, the peelability of the label and the recyclability of the body were confirmed.

[0126] (Example B2) Except for fabricating the main body with the following layer structure, the design, concealment, and barrier properties of the tube container were evaluated, and the peelability of the label and the recyclability of the main body were confirmed in the same manner as in Example B1. Static-proof PEF (50 μm) / PE (30 μm) / Opalescent PEF (120 μm)

[0127] (Example B3) Except for fabricating the main body with the following layer structure, the design, concealment, and barrier properties of the tube container were evaluated, and the peelability of the label and the recyclability of the main body were confirmed in the same manner as in Example B1. Static-proof PEF (100 μm) / PE (20 μm) / EVOH-PEF (80 μm)

[0128] (Example B4) Except for fabricating the main body with the following layer structure, the design, concealment, and barrier properties of the tube container were evaluated, and the peelability of the label and the recyclability of the main body were confirmed in the same manner as in Example B1. Static-proof PEF (80 μm) / PE (20 μm) / EVOH-PEF (80 μm) / PE (30 μm) / PEF (120 μm)

[0129] (Example B5) Except for fabricating the main body with the following layer structure, the design, concealment, and barrier properties of the tube container were evaluated, and the peelability of the label and the recyclability of the main body were confirmed in the same manner as in Example B1. Static-proof PEF (80 μm) / PE (20 μm) / EVOH-PEF (80 μm) / PE (30 μm) / Opalescent PEF (100 μm)

[0130] (Comparative Example 1) Except for fabricating the packaging material for the tube container with the following layer structure by the dry lamination method, the design, concealment, and barrier properties of the tube container were evaluated, and the peelability of the label and the recyclability of the main body were confirmed in the same manner as in Example A1. LLDPEF (130 μm) / DL / PET (12 μm) / Printing layer / DL / VM-PET (12 μm) / DL / PEF (180 μm) In the above, "LLDPEF" means a linear low-density polyethylene film (the same applies hereinafter). Also, "VM-PET" means a polyethylene terephthalate film provided with a vapor deposition layer of aluminum (the same applies hereinafter).

[0131] (Comparative Example 2) Except for preparing a packaging material for a tube container having the following layer structure by the dry lamination method, the designability, concealment, and barrier properties of the tube container were evaluated in the same manner as in Example A1, and the peelability of the label and the recyclability of the main body were confirmed. LLDPEF(130μm) / DL / PET(12μm) / Printing layer / DL / PEF(180μm)

[0132] The above results are shown in Table 1 and Table 2. Note that Table 1 shows the results for a tube container in which the label covers the entire area of the main body as shown in FIG. 1. Also, Table 2 shows the results for a tube container in which the label covers only a partial area of the main body as shown in FIG. 9.

[0133] [Table 1]

[0134] [Table 2]

[0135] In Table 1 above, "good" in the column of "designability" means that the appearance was good. Also, "poor" in the column of "designability" means that the appearance was bad.

[0136] Also, in Table 1 above, "excellent" in the column of "concealment" means that the concealment was quite excellent. Also, "good" in the column of "concealment" means that the concealment was excellent. Also, "poor" in the column of "concealment" means that the concealment was not excellent.

[0137] In addition, in Table 1 above, "good" in the column of "Recyclability" means that it was recyclable. Also, "poor" in the column of "Recyclability" means that recycling was difficult.

[0138] Furthermore, in Table 1 above, "good" in the column of "Easiness of peeling" means that it could be easily peeled off. Also, "poor" in the column of "Easiness of peeling" means that it could not be easily peeled off.

[0139] As a result, in Examples 1 to B5, all the results were good.

[0140] It is also possible to appropriately combine a plurality of components disclosed in the above embodiments as needed. Alternatively, some components may be deleted from all the components shown in the above embodiments.

Explanation of reference numerals

[0141] 10 Packaging material for tube container 20 Body part 11 First sealant layer 12 Second sealant layer 13 Body base material layer 30 Label 30a Unbonded area 31 Label base material layer 32 Printing layer 33 Seal layer 33a Sea 33b Island 34 Barrier layer 40 Tube container 40A Tube container with cap 41 Body tube 42 One end 43 Head member 49 Cap 101 Outer surface 102 Inner surface

Claims

1. In a packaging material for a tube container, a main body portion, a label that is detachably adhered to the outside of the main body portion and covers the main body portion over the entire circumference, the label has, in order from the outer surface toward the inner surface, a label base material layer, a printing layer, and a seal layer, the label base material layer contains polyethylene, polypropylene, polyethylene terephthalate, or nylon, the seal layer has easy peelability and has a sea-island structure in which polyethylene is the sea and polypropylene is the island, the label has an unadhered area in which opposing edges in the circumferential direction are overlapped without being adhered to each other, a packaging material for a tube container, wherein the width of the unadhered area is 2 mm or more.

2. The packaging material for a tube container according to claim 1, wherein the label further has a barrier layer provided on the label base material layer.

3. The main body portion has, in order from the outer surface toward the inner surface, a first sealant layer and a second sealant layer, The packaging material for a tube container according to claim 1, wherein at least 90% or more of the main body portion is made of the same resin-based material.

4. The packaging material for a tube container according to claim 3, wherein the first sealant layer and the second sealant layer each contain milky white polyethylene.

5. The packaging material for a tube container according to claim 3, wherein the first sealant layer contains an antistatic agent.

6. The density of the first sealant layer and the density of the second sealant layer are each 0.90 kg / cm ３ or more and 0.93 kg / cm ３ or less. The packaging material for a tube container according to claim 3.

7. The packaging material for a tube container according to claim 3, wherein the main body portion further has a main body base material layer provided between the first sealant layer and the second sealant layer.

8. In a tube container, a body tube in which opposing edges of the main body portion of the packaging material for a tube container according to any one of claims 1 to 7 are overlapped and joined to each other, a head member joined to one end of the body tube, a tube container.

9. The tube container according to claim 8, wherein the head member contains polyethylene.

10. In a capped tube container, the tube container according to claim 9, a cap attached to the head member, a capped tube container.

11. The capped tube container according to claim 10, wherein the cap contains polyethylene.

Images