Tube container with peelable sheet

Abstract

To provide a tube container with a peelable sheet having excellent usability and / or designability.SOLUTION: The peelable sheet-attached tube container 100 has a tube container body 50 and a peelable sheet 10, wherein the peelable sheet 10 includes a laminate in which a base material layer and an easily peelable layer are laminated, and is joined to the body portion 50 of the tube container body 100 in a wound shape via the easily peelable layer, and when the peelable sheet 10 is peeled off from the body portion 50 of the tube container body 100, at least a part of the easily peelable layer remains on the side of the body portion 50. In the tube container 100 with the peelable sheet, a roughened surface is formed, the surface roughness Ra of the roughened surface is 0.6 μm or more, and / or the dynamic friction coefficient of the roughened surface is less than 0.40 μ D.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a tube container with a peelable sheet, and more particularly to a tube container with a peelable sheet having a tube container body and a peelable sheet wrapped around the barrel of the tube container body. [Background technology]

[0002] Tube containers have traditionally been used as containers for a variety of products, including medicines, toothpaste, food, cosmetics, adhesives, etc. Tube containers are generally tube bodies formed from a synthetic resin tube blown or extruded into a cylindrical shape, or tube bodies formed by winding an aluminum laminate sheet into a cylindrical shape, and are often used by heat-sealing a head portion, with a nozzle extending from the upper opening of a cap-shaped shoulder portion, to the upper end of the cylindrical body, and then filling the container with the contents before heat-sealing the lower opening of the body.

[0003] Furthermore, with regard to such tube containers, tube containers with a peelable sheet have been developed, in which a sheet is wrapped around the body of the tube container as a medium for information such as patterns and letters and / or as a decorative sheet for aesthetic purposes.

[0004] For example, Patent Document 1 discloses a method of labeling the surface with a decorative film using the residual heat while extruding the body of a tube container, which serves as the base.

[0005] Patent document 2 also discloses a tube container in which a heat-sensitive label decorated with a printing layer is adhered and fixed in a spiral shape by heat fusion within a predetermined height range on the outer peripheral surface of the barrel of a preformed tube container body.

[0006] Furthermore, Patent Document 3 discloses a decorated polyethylene tube container characterized in that a decorative (decorative) film is wrapped around the barrel of the polyethylene tube container body via an adhesive layer adjacent to the decorative layer, with the winding start and end overlapping.

[0007] It is believed that the tube containers with peelable sheets disclosed in the above-mentioned Patent Documents 1 to 3 are all designed so that the decorative sheet (film or label) does not peel off or fall off from the tube container body.

[0008] The inventors have found that it is preferable to peel off some or all of the layers of the peelable sheet from the tube container body as needed in the following circumstances: for example, when points or marks for a product campaign or prize draw are printed on the peelable sheet and it is necessary to cut off the points or marks in order to enter the campaign or prize draw, when it is necessary to soften the tube container and empty all of the contents from the tube, or when it is necessary to separate the sheet and the tube container body for disposal or recycling.

[0009] Therefore, there is also a need for a tube container with a peelable sheet that allows some or all of the layers of the peelable sheet to be easily peeled off from the tube container body.

[0010] In response to this, the present inventors have developed a tube container with a peelable sheet, which has a tube container body and a peelable sheet, in which the peelable sheet includes a laminate in which a base layer and an easily peelable sealant layer are laminated, and which is heat-sealed in a wound manner to the body of the tube container via the easily peelable sealant layer (Patent Document 4).

[0011] Shrink labels used on PET bottles and the like can be easily peeled off from the PET bottle. However, when such shrink labels are applied to tube containers, the shrink label floats up when the body of the tube container is squeezed to push out the contents, which creates a problem with the feel of use. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Special Publication No. 2019-531928 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-105692 [Patent Document 3] Japanese Patent Application Publication No. 07-040515 [Patent Document 4] Patent Publication No. 2023-028610 Summary of the Invention [Problem to be solved by the invention]

[0013] As described above, the present inventors have developed a tube container with a peelable sheet in which part or all of the layers of the peelable sheet can be easily peeled off from the tube container body (Patent Document 4).

[0014] An object of the present invention is to further improve the usability and / or design of a tube container with a peelable sheet as shown in Patent Document 4. [Means for solving the problem]

[0015] The present inventors have discovered that in a tube container with a peelable sheet as shown in Patent Document 4, when the peelable sheet is peeled from the body of the tube container, by allowing at least a portion of the easily peelable layer to remain on the body side in a controlled form, the usability and / or design of the tube container can be further improved, and have arrived at the present invention. That is, the present invention is as follows.

[0016] <Aspect 1> A tube container with a peelable sheet, comprising a tube container body and a peelable sheet, the peelable sheet includes a laminate in which a base layer and an easily peelable layer are laminated, and is wound and joined to the barrel of the tube container body on the side of the easily peelable layer, When the peelable sheet is peeled off from the body of the tube container body, at least a part of the easily peelable layer remains on the body side, forming a roughened surface having a surface roughness Ra of 0.6 μm or more. Tube container with peelable sheet. <Aspect 2> 2. The tube container according to claim 1, wherein when the peelable sheet is peeled off from the barrel of the tube container body, the surface of the peelable sheet facing the barrel has a surface roughness Ra of 0.6 μm or more. <Aspect 3> 3. The tube container of claim 1 or 2, wherein the roughened surface has a dynamic friction coefficient of less than 0.40 μD. <Aspect 4> The easily peelable layer is an easily peelable sealant layer, and the peelable sheet is heat-sealed in a wound state to the barrel of the tube container body via the easily peelable sealant layer; The tube container according to any one of aspects 1 to 3. <Aspect 5> 5. The tube container according to any one of aspects 1 to 4, wherein the substrate layer has an unbleached paper layer. <Aspect 6> 6. The tube container according to any one of aspects 1 to 5, wherein the easily peelable layer is of an interfacial peelable type. <Aspect 7> 6. The tube container according to any one of aspects 1 to 5, wherein the easily peelable layer is of intralayer cohesive failure type. <Aspect 8> A tube container according to any one of aspects 1 to 7, wherein the peelable sheet has a peel trigger. <Aspect 9> 9. The tube container according to any one of aspects 1 to 8, wherein the peelable sheet is provided with a spiral perforation with the tube container as its axis. <Aspect 10> 10. The tube container according to any one of aspects 1 to 9, wherein the peelable sheet bears an indication that the peelable sheet is peelable. [Effects of the Invention]

[0017] According to the tube container with peelable sheet of the present invention, after the peelable sheet is peeled off, the tube container body has a roughened surface formed by at least a portion of the easily peelable layer, thereby further improving the usability and / or design of the tube container. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a front view showing one embodiment of a tube container with a peelable sheet of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view of the barrel of the tube container body and the peelable sheet in one embodiment of the tube container with a peelable sheet of the present invention (FIG. 2(a): before peeling of the peelable sheet, FIG. 2(b): after peeling of the peelable sheet). [Figure 3] FIG. 3 is a schematic cross-sectional view of the barrel of the tube container body and the peelable sheet in one embodiment of the tube container with a peelable sheet of the present invention (FIG. 3(a): before peeling of the peelable sheet, FIG. 3(b): after peeling of the peelable sheet). [Figure 4] FIG. 4 is a schematic cross-sectional view of the barrel portion of the tube container body and the peelable sheet in one embodiment of a conventional tube container with a peelable sheet (FIG. 4(a): before peeling of the peelable sheet, FIG. 4(b): after peeling of the peelable sheet). [Figure 5] FIG. 5 is a schematic cross-sectional view of the barrel portion of the tube container body and the peelable sheet in one embodiment of a conventional tube container with a peelable sheet (FIG. 5(a): before peeling of the peelable sheet, FIG. 5(b): after peeling of the peelable sheet). [Figure 6] FIG. 6 is a schematic cross-sectional view illustrating an example of a substrate layer of a peelable sheet that can be used in the tube container with a peelable sheet of the present invention. [Figure 7] FIG. 7 is an image diagram showing the peel trigger state of each of the tube containers with peelable sheets of Reference Examples 1 to 6. DETAILED DESCRIPTION OF THE INVENTION

[0019] <Tube container with peelable sheet> The tube container with a peelable sheet of the present invention (hereinafter also simply referred to as the "tube container of the present invention") is A tube container with a peelable sheet, comprising a tube container body and a peelable sheet, the peelable sheet includes a laminate in which a base layer and an easily peelable layer are laminated, and is wound and joined to the barrel of the tube container body on the side of the easily peelable layer, When the peelable sheet is peeled off from the body of the tube container body, at least a part of the easily peelable layer remains on the body side, forming a roughened surface having a surface roughness Ra of 0.6 μm or more. Tube container with peelable sheet is.

[0020] In the tubular container of the present invention, when the peelable sheet is peeled off from the barrel of the tubular container body, at least a part of the easily peelable layer remains on the barrel side, forming a roughened surface with a surface roughness Ra of 0.6 μm or more. According to the tubular container of the present invention, such a roughened surface can improve the usability and / or design of the tubular container.

[0021] In the tube container of the present invention, improved "usability" means that when the peelable sheet is peeled from the barrel of the tube container body, the portion of the easily peelable layer remaining on the barrel side forms a roughened surface, which makes it easy for fingers to slide over the barrel of the tube container body when squeezing out the contents of the tube container body. Also, improved "design" in the tube container of the present invention means that when the peelable sheet is peeled from the barrel of the tube container body, the portion of the easily peelable layer remaining on the barrel side forms a roughened surface, which allows this roughened surface to provide design (patterns, a luxurious feel, etc.).

[0022] Here, the surface roughness Ra of this roughened surface may be 0.6 μm or more, 0.7 μm or more, 0.8 μm or more, 0.9 μm or more, 1.0 μm or more, or 1.1 μm or more, and may be 10.0 μm or less, 8.0 μm or less, 7.0 μm or less, 6.0 μm or less, 5.0 μm or less, 4.0 μm or less, 3.0 μm or less, or 2.0 μm or less.

[0023] In the present invention, the "surface roughness Ra" (arithmetic mean roughness Ra) can be measured in accordance with JIS B 0601-2001K.

[0024] The coefficient of dynamic friction of this roughened surface may be less than 0.40 μD, 0.35 μD or less, 0.30 μD or less, or 0.25 μD or less, or may be 0.05 μD or more, 0.10 μD or more, 0.15 μD or more, or 2.00 μD or more.

[0025] In the present invention, the "dynamic friction coefficient" can be measured in accordance with JIS K 7125.

[0026] For example, as shown in FIG. 1, a tube container 100 with a peelable sheet of the present invention has a tube container body 50 and a peelable sheet 10, and the peelable sheet 10 includes a laminate in which a base layer and an easily peelable layer are laminated, and is wound around and bonded to the barrel portion 20 of the tube container body on the side of the easily peelable layer.

[0027] In the present invention, the state in which the peelable sheet is wound around the barrel of the tube container body refers to the state in which the peelable sheet is wound around the barrel of the tube container body, regardless of the method of wrapping the peelable sheet around the barrel of the tube container body. Therefore, the joined portion may be a full-surface join or may be joined in a striped pattern.

[0028] In the present invention, the easily peelable layer may be an easily peelable sealant layer, and the peelable sheet may be heat-sealed in a wrap-around manner to the barrel of the tube container body via the easily peelable sealant layer.

[0029] In the present invention, the peelable sheet may be bonded to the barrel of the tube container body on the side of the easily peelable layer via an adhesive layer made of a pressure-sensitive adhesive, an adhesive layer made of an adhesive, and a heat-seal layer made of a thermoplastic resin. Examples of adhesives that can be used here include dry laminating adhesives, anchor coating adhesives, water-soluble adhesives, emulsion adhesives, and non-solvent laminating adhesives. Polyolefins, particularly polyethylene resins and polypropylene resins, can be used for the heat-seal layer.

[0030] The tube container of the present invention has a peelable sheet wound around the tube container body, and thus can have the effects of the peelable sheet, specifically, for example, one or more of the following advantages (1) to (9).

[0031] (1) Improving barrier properties In the tube container of the present invention, the peelable sheet has a barrier layer, which improves the barrier properties of the entire tube container.

[0032] (2) Use of various decorative layers In the tube container of the present invention, the surface layer and / or inner layer, especially the surface layer, has a decorative layer, which makes it possible to use decorative layers that were difficult to use in conventional laminated tubes, such as embossed PET film and PET film with a hologram vapor deposition film.

[0033] (3) Improved production efficiency / small lot handling Conventional blown tubes and laminated tubes have a printed layer formed by direct printing. Therefore, for example, if a design needs to be changed, the printing plate must be replaced each time. In contrast, the tube container of the present invention uses a peelable sheet, so that the design can be changed simply by replacing the printed peelable sheet.

[0034] Furthermore, with regard to printing, the tube container of the present invention does not form side seams with a laminate like conventional laminated tubes, so it is possible to use printing methods such as digital printing, which are functionally insufficient when considering conventional side seams (in this case, the laminate strength and ink adhesion are insufficient).

[0035] Therefore, with the tube container of the present invention, digital printing not only enables small-lot production of a wide variety of products and short delivery times, but also leads to a reduction in defectively printed products.

[0036] (4) Thinning the tube body and reducing the amount of resin used In the tube container of the present invention, by wrapping a highly rigid peelable sheet around the barrel of the tube container body, the tube container can be made self-supporting even if the tube container body is made thin-walled.

[0037] Furthermore, in the tube container of the present invention, the amount of resin used to form the tube container body can be reduced by making the tube container body thinner.

[0038] (5) Improved ease of sorting and disposal of tube containers In the past, tube containers with a peelable sheet, in which the peelable sheet and the tube container body cannot be separated, were generally disposed of as combustible waste. In contrast, because the peelable sheet uses an easily peelable layer, the tube container of the present invention can be disposed of by separating the peelable sheet and the tube container body. This separate disposal also reduces the amount of combustible waste.

[0039] (6) Easy disposal Since the peelable sheet uses an easily peelable layer, the tube container of the present invention can be disposed of compactly by thinning the tube container body.

[0040] (7) Contributes to the end of use (squeezability) Since an easily peelable layer is used in the peelable sheet, in the tube container of the present invention, the peelable sheet can be peeled off and the contents can be easily squeezed out of the relatively softened tube container body (finally, the contents can be made thin and easy to squeeze out).

[0041] (8) Providing additional information such as advertisements and leaflets Since an easily peelable layer is used in the peelable sheet, in the tube container of the present invention, by making the overlapping portion of the peelable sheet longer (larger), additional information such as advertising or a package insert can be provided in this portion.

[0042] (9) Information about product campaigns or lotteries on a removable sheet Since an easily peelable layer is used in the peelable sheet, in the tube container of the present invention, by writing product campaign information or a "lottery" or the like on the peelable sheet, it is possible to peel off the peelable sheet and make it easy to enter.

[0043] In the tube container of the present invention, as described above, when the peelable sheet is peeled off from the barrel of the tube container body, at least a portion of the easily peelable layer remains on the barrel side, forming a roughened surface.

[0044] Specifically, for example, in the case of the tube container of the present invention, when the easily peelable layer is of the interfacial peeling type, a peelable sheet 10A is provided that is bonded to the barrel 20 of the tube container body as shown in Figure 2(a), and when the peelable sheet 10A is peeled off from the barrel 20 of the tube container body as shown in Figure 2(b), interfacial peeling occurs between the base layer 1A and the easily peelable layer 2A, and the portion of the easily peelable layer 2A that remains on the barrel side forms a roughened surface.

[0045] Furthermore, for example, in the tube container of the present invention, when the easily peelable layer is of the intralayer cohesive failure type, a peelable sheet 10B is provided that is bonded to the barrel 20 of the tube container body as shown in Figure 3(a), and when the peelable sheet 10B is peeled off from the barrel 20 of the tube container body as shown in Figure 3(b), cohesive failure occurs within the easily peelable layer 2B, and the portion of the easily peelable layer 2B that remains on the barrel side forms a roughened surface.

[0046] In contrast, in conventional tube containers, whether the easily peelable layer is of the interfacial peeling type or the intralayer cohesive failure type, the portion of the easily peelable layer 2A that remains on the body side does not form a sufficiently roughened surface, as shown in Figures 4 and 5.

[0047] 2 and 3, the easily peelable layers 2A and 2B are easily peelable sealant layers, and the peelable sheets 10A and 10B are directly heat-sealed to the barrel part 20 of the tubular container body via the easily peelable sealant layers. However, the peelable sheets 10A and 10B may be bonded to the barrel part 20 of the tubular container body on the surfaces of the easily peelable layers 2A and 2B via an adhesive layer made of an adhesive, an adhesive layer made of an adhesive, or a heat-seal layer made of a thermoplastic resin, all of which are not shown.

[0048] Each component of the tube container with a peelable sheet of the present invention will be described below.

[0049] <Removable sheet> The peelable sheet of the present invention includes a laminate in which a base layer and an easily peelable layer are laminated, and is wound and bonded to the barrel of a tube container body via the easily peelable layer. The layers of the peelable sheet of the present invention may be bonded to each other directly by heat sealing or via a bonding layer such as a pressure-sensitive adhesive layer, an adhesive layer, or a heat-sealing layer.

[0050] (base material layer) In the peelable sheet of the present invention, the surface of the base layer facing the easily peelable layer has a predetermined surface roughness, so that this surface of the base layer functions as an embossing mold, and the portion of the easily peelable layer that remains on the body side forms a roughened surface.

[0051] Here, when the peelable sheet is peeled off from the body of the tube container body, the surface roughness Ra of the body side surface of the peelable sheet may be 0.6 μm or more, 0.7 μm or more, 0.8 μm or more, 0.9 μm or more, 1.0 μm or more, or 1.1 μm or more, and may be 10.0 μm or less, 8.0 μm or less, 7.0 μm or less, 6.0 μm or less, 5.0 μm or less, 4.0 μm or less, 3.0 μm or less, or 2.0 μm or less.

[0052] The surface roughness Ra of the body side surface of this peelable sheet can be provided by the surface roughness of the substrate itself, or by forming irregularities on the surface of the substrate by printing or the like.

[0053] Specifically, for example, as shown in Fig. 6(a), the base material layer 1E itself can have surface roughness. In this case, as shown in Fig. 6(b), the base material layer 1F has a base material layer main body 1Fa and a surface layer 1Fb, such as a polymer film layer or polymer coating layer 1Fb, on the surface facing the easily peelable layer, which can protect the uneven surface and adjust the peel force between the easily peelable layer, etc.

[0054] 6(c), the substrate layer 1G may have a substrate layer main body 1Ga and a partial printed layer 1Gc. In this case, as shown in FIG. 6(d), the substrate layer 1H may have a surface layer 1Hb on the side of the easily peelable layer, such as a polymer film layer or polymer coating layer 1Hb, which can protect the partial printed layer 1Hc and adjust the peel force between the easily peelable layer and the substrate layer.

[0055] The material constituting the base layer, particularly the base layer main body, is not particularly limited, and can be selected from, for example, materials having sufficient flexibility to follow the squeeze deformation of the tube container without discomfort. Furthermore, the material constituting the base layer, particularly the base layer main body, may be selected from materials that can withstand the heat used in heat sealing, for example, since the peelable sheet is joined by the easily peelable sealant layer by heat sealing.

[0056] In the present invention, the thickness of the base layer is not particularly limited, and may be, for example, 1 μm or more, 5 μm or more, 10 μm or more, or 20 μm or more from the viewpoint of imparting durability to the peelable sheet, and may be 100 μm or less, 50 μm or less, 40 μm or less, or 30 μm or less from the viewpoint of imparting flexibility to the sheet.

[0057] In the present invention, the substrate layer may comprise one or more polymer film layers or paper layers.

[0058] More specifically, examples of polymer films used in the substrate layer include polyethylene films, polypropylene films, and polyester films, particularly polypropylene films such as biaxially oriented polypropylene films, and polyester films such as biaxially oriented polyethylene terephthalate films. Examples of paper used in the substrate layer include bleached paper and unbleached paper. Unbleached paper can have a relatively high roughness by itself and is therefore preferably used as the substrate layer in the tube container of the present invention.

[0059] The substrate layer may further include layers other than the polymer film layer or paper layer to provide additional functions, such as, but not limited to, a heat insulating layer such as a foamed polymer layer or a fiber layer, an adhesive layer such as a urethane adhesive, etc.

[0060] The substrate layer may have printed text information, symbols, marks, etc. on the surface of one or more layers constituting the substrate layer. The substrate layer may also have a decorative layer that can be observed from the outside of the tube container when the peelable sheet of the present invention is wound around the tube container body, thereby decorating the appearance of the tube container, particularly a decorative layer that decorates (decorates) the appearance with a pattern, color, gloss, etc.

[0061] (Easy peeling layer) In the present invention, the term "easily peelable layer" refers to a layer that allows easy manual peeling of part or all of the layers constituting the peelable sheet from a state in which the peelable sheet is heat-sealed to the barrel of the tube container body. In the present invention, the peel strength when peeling the peelable sheet may be, for example, 12 N / 15 mm or less, 8.0 N / 15 mm or less, or 5.0 N / 15 mm or less, or 0.10 N / 15 mm or more, 0.20 N / 15 mm or more, 0.30 N / 15 mm or more, 0.50 N / 15 mm or more, or 1.0 N / 15 mm or more. The term "peel strength" refers to the peel strength measured when peeled at a 180° angle according to, for example, the method specified in JIS-Z-0238.

[0062] In the present invention, the thickness of the easily peelable layer is not particularly limited and can be selected taking into consideration the usability (squeeze durability) when using the tube container, the ease of peeling when peeling off part or all of the layers constituting the peelable sheet, etc. For example, the thickness of the easily peelable layer may be 1 μm or more, 5 μm or more, 10 μm or more, or 20 μm or more, and may be 100 μm or less, 50 μm or less, 40 μm or less, or 30 μm or less.

[0063] In the present invention, the easily peelable layer may be a single layer or a laminate of multiple layers (for example, 2 or more, 3 or more, or 4 or more, and 6 or less, or 5 or less).

[0064] In the present invention, the easily peelable layer may be an easily peelable layer of intralayer cohesive failure type or an easily peelable layer of interfacial peeling type.

[0065] In the present invention, an "intralayer cohesive failure type easily peelable layer" refers to an easily peelable layer in which, when the peelable sheet is peeled off from the barrel of the tube container body, the inside of the easily peelable layer, which is a single layer, breaks, or the inside of one of the multiple layers that make up the easily peelable layer, which is a laminate of multiple layers, breaks, with a part of the broken easily peelable layer remaining on the tube container body side and another part of the broken easily peelable layer remaining on the peelable sheet side.

[0066] Furthermore, in the present invention, the "interface peelable layer" refers to a layer that peels off at the interface between the easily peelable layer and an adjacent layer, the interface between the easily peelable layer and the tube container body, or the interface between multiple layers that make up the easily peelable layer, which is a laminate of multiple layers, when the peelable sheet is peeled off from the barrel of the tube container body. Therefore, when an "interface peelable layer" is used in the tube container of the present invention, when the peelable sheet is peeled off from the tube container body, the entire easily peelable layer may remain on the tube container side, or a part of the easily peelable layer may remain on the tube container side and the remainder of the easily peelable layer may remain on the base layer side.

[0067] In the present invention, the material constituting the easily peelable layer is not particularly limited, but may be appropriately determined based on the type, for example, "intralayer cohesive failure type easily peelable layer" or "interfacial peel type easily peelable layer."

[0068] More specifically, the material constituting the intralayer cohesive failure type easily peelable layer may be selected from polyolefin resins, for example.

[0069] More specifically, examples of polyolefin-based resins include ethylene-based resins such as low-density polyethylene (LDPE), medium-density polyethylene (MDPE), linear low-density polyethylene (LLDPE), ethylene-vinyl acetate copolymer (EVA), and ethylene-α-olefin copolymer; polypropylene-based resins such as homopolypropylene, propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer; and polybutene. The polyolefin-based resin may be composed of a single material or a blend of these materials as the main raw material. It is preferable to select a material from these materials that can be heat-sealed to the tube container body.

[0070] The material for the interface peelable type easy peel layer may be selected from a mixture of polyolefin resin and cyclic olefin copolymer in any ratio, and the ratio of the cyclic olefin copolymer to the total of the polyolefin resin and the cyclic olefin copolymer may be, for example, 1.0 to 50 mass%, particularly 1.0 to 20 mass%, 1.0 to 10 mass%, or 3.0 to 10 mass%.

[0071] Here, a cyclic olefin copolymer refers to a polymer in which a cyclic olefin is used as a monomer and which has a saturated hydrocarbon ring structure in the main chain or side chain of the polymer. The cyclic olefin copolymer is preferably a copolymer containing at least one cyclic olefin and at least one vinyl compound other than the cyclic olefin as monomers. The cyclic olefin copolymer may be a cyclic olefin random copolymer (COC) obtained by addition polymerization using at least one cyclic olefin and at least one vinyl compound other than the cyclic olefin as monomers, or a cyclic olefin ring-opening polymer or its hydrogenated product (COP) obtained by ring-opening polymerization using at least one compound having a double bond in a fused ring skeleton and at least one unsaturated compound other than the compound as monomers.

[0072] When the cyclic olefin copolymer is a cyclic olefin random copolymer (COC) obtained by addition polymerization, the cyclic olefin serving as a monomer is not particularly limited, and examples thereof include monocyclic cycloolefins such as cyclobutene, 3-methylcyclobutene, 3,4-diisopropenylcyclobutene, cyclopentene, 1-methylcyclopentene, 3-methylcyclopentene, cyclohexene, cyclooctene, 1-methylcyclooctene, 5-methylcyclooctene, cyclooctatetraene, and cyclododecene; polycyclic cycloolefins such as tetracyclododecene and norbornene; and derivatives thereof.

[0073] Furthermore, the vinyl compound other than the cyclic olefin that serves as a comonomer for the cyclic olefin random copolymer (COC) is not particularly limited, and examples thereof include α-olefins such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-pentene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, and 1-decene; monocyclic dienes such as cyclopentadiene, 1,3-cyclohexadiene, and 1,4-cyclohexadiene; polycyclic dienes having a norbornene ring or the like with two unsaturated bonds; and linear or branched dienes such as butadiene and isoprene.

[0074] When a cyclic olefin random copolymer (COC) is used as a material constituting an interface peelable type easy peel layer, the proportion of structural units derived from the cyclic olefin is preferably 15 to 60 mol %, more preferably in the range of 25 to 50 mol %.

[0075] In addition, when the cyclic olefin copolymer is a cyclic olefin ring-opening polymer or its hydrogenated product (COP) obtained by ring-opening polymerization, the compound having a double bond in the condensed ring skeleton to be used as the monomer is not particularly limited as long as it can be polymerized by the metasense polymerization catalyst. For example, compounds having a norbornene skeleton such as tetracyclododecene, norbornene, or derivatives thereof can be used.

[0076] In addition, the unsaturated compound other than the compound having a double bond in the fused ring skeleton, which is used as a comonomer of the cyclic olefin ring-opening polymer, is not particularly limited as long as it can be polymerized by the Metasense polymerization catalyst. For example, the cyclic olefin, which is used as a monomer of the above-mentioned cyclic olefin random copolymer (COC), cyclic diene, monomer having a carbon-carbon double bond in the main chain, and derivatives thereof can be mentioned.

[0077] The cyclic olefin ring-opening polymer has a carbon-carbon double bond (C=C) in the main chain. When hydrogenated, a hydrogenated product (COP) can be obtained in which the double bond in the main chain is converted to a carbon-carbon single bond (CC). From the viewpoints of heat resistance, weather resistance, etc., a polymer in which at least the carbon-carbon double bond in the main chain is hydrogenated is also acceptable.

[0078] When a cyclic olefin ring-opening polymer or a hydrogenated product thereof (COP) is used, the proportion of structural units derived from a compound having a double bond in the fused ring skeleton is preferably 80 mass% or more, taking into consideration that the polymer will be subjected to a hydrogenation reaction.

[0079] (Method of manufacturing a peelable sheet) The method for producing the peelable sheet according to the present invention is not particularly limited, and lamination can be performed using, for example, a dry lamination method, a sand lamination method, or a co-extrusion film molding method. Note that commercially available sheet molded products may be used as they are for each layer or laminate.

[0080] (Peeling trigger) In the present invention, from the viewpoint of improving the ease of peeling of the peelable sheet, the peelable sheet may have a peel trigger, or may have a spiral perforation with the tube container body as its axis, or may have both.

[0081] By providing a peeling trigger, the peelable sheet can be more easily peeled from the tube container body. In particular, in the case of a tube container body whose surface includes a metal material, it is preferable that the peelable sheet has a peeling trigger.

[0082] In the present invention, the peel trigger is not particularly limited and may be, for example, the following: (i) when the peelable sheet is heat-sealed to the barrel of the tube container body, the peel trigger can be an area in the easily peelable layer of the peelable sheet that is not heat-sealed or an area that is heat-sealed more weakly than other areas; (ii) a welding-inhibiting layer such as a release varnish can be provided on part of the easily peelable layer of the peelable sheet, and this can be used as the peel trigger.

[0083] Furthermore, from the viewpoint of improving the ease of peeling of the peelable sheet, it is preferable that at least a portion of the peel trigger is present at the seam of the peelable sheet. Here, the seam of the peelable sheet refers to the opposing or overlapping portion of both ends of the sheet in the winding direction when the peelable sheet is heat-sealed in a wound state around the barrel of the tube container body. That is, the both ends of the peelable sheet may be (i) spaced apart by a certain distance, (ii) tightly connected, or (iii) overlapped. For example, when the peelable sheet has an easily peelable layer that undergoes cohesive failure within the layer when peeled, the seam may be any of the types (i) to (iii) above. Furthermore, when the peelable layer has an easily peelable layer that undergoes interfacial peeling when peeled, the seam is preferably of the type (i) or (ii) above.

[0084] (display) In the present invention, when the peelable sheet further has an easily peelable layer, the peelable sheet may have a marking indicating that the peelable sheet is peelable. More specifically, the peelable sheet may be marked with a marking indicating that the peelable sheet is peelable, how to peel it, that it can be peeled and disposed of separately, or that it can be peeled and used to apply for an application using a specific part, etc. Such a marking can provide convenience to users, etc.

[0085] The releasable sheet may also have an indication that the releasable sheet can be peeled off from the tube container body by pressing the side of the winding start portion near the overlap portion.

[0086] Such markings can be printed on one or more layers constituting the surface layer, and the form of the marking may be a marking using only letters, a marking using only symbols, marks, etc., or a combination of these.

[0087] <Tube container body> In the present invention, the tube container is used as a container for filling contents such as medicines, toothpaste, food, cosmetics, adhesives, etc.

[0088] The tube container body can have a body portion and a spout portion. Depending on design, practicality, etc., the tube container body may further have, for example, a shoulder portion between the body portion and the spout portion. For example, as shown in Fig. 1, a tube container body 50 has a body portion 20, a shoulder portion 30, and a spout portion 40.

[0089] In the present invention, the tube body may be a laminate tube, a single-layer or multi-layer extruded tube, or a single-layer or multi-layer blown tube. The laminate or single layer forming the tube body may include a layer made of a resin material and a layer made of a metal material. When the tube body is formed of multiple layers, the layers may contain the same material or different materials.

[0090] <<Method for manufacturing a tube container with a peelable sheet>> The method for producing the tube container with a peelable sheet of the present invention is not particularly limited.

[0091] Therefore, for example, the tube container with a peelable sheet of the present invention can be produced by preparing a tube container body and a peelable sheet, and then using a rotary heat roll to face the heat seal layer, which is the innermost layer of the peelable sheet, toward the body of the tube container body and heat-pressure bonding it, thereby heat-sealing the peelable sheet in a wound manner around the body of the tube container body.

[0092] The temperature during thermocompression bonding is not particularly limited and may be, for example, 100 to 300° C. The force during thermocompression bonding is not particularly limited and may be, for example, 5 to 20 kgf.

[0093] When the innermost layer of the peelable sheet is not a heat seal layer, the joining can be carried out using an adhesive layer made of a pressure sensitive adhesive or an adhesive layer made of an adhesive. [Example]

[0094] EXAMPLES The present invention will be described below using examples and comparative examples, but the present invention is not limited to these.

[0095] Examples and Comparative Examples As peelable sheets for the Examples and Comparative Examples, laminates having the following layer configuration were prepared (note that " / / " indicates adhesion with a dry lamination adhesive).

[0096] Example 1 Unbleached paper layer (Oji Paper Co., Ltd.) (65 μm) / / PET layer (12 μm) / / Easy-peel sealant layer (50 μm) Example 2 Unbleached paper layer (Nippon Paper Industries Co., Ltd.) (65 μm) / / PET layer (12 μm) / / Easy-peel sealant layer (50 μm) Comparative Example 1 Bleached paper (coated paper) layer (Nippon Paper Industries Co., Ltd.) (40 μm) / / PET layer (12 μm) / / Easy-peel sealant layer (50 μm) Comparative Example 2 PET layer (12 μm) / / Al foil layer (9 μm) / / PET layer (12 μm) / / Easy-peel sealant layer (50 μm)

[0097] The details of each layer structure described above are as follows: PET layer: polyethylene terephthalate layer Al foil layer: Aluminum foil layer Easy-peel sealant layer: a laminate (interfacial peeling between the substrate layer and the polyethylene layer on the tube container side) of an interface-peelable easy-peel resin layer on the substrate layer side (here, the easy-peel resin layer is a layer made of a mixed resin (LDPE:COC (mixing mass ratio) = 95:5) of low-density polyethylene (LDPE) (Petrosene 226 manufactured by Tosoh Corporation) and addition-polymerized cyclic olefin random copolymer (COC) (Apel 6013B manufactured by Mitsui Chemicals, Inc.)

[0098] The layer structure of the blow tube used as the tube container body in the examples and comparative examples is as follows, from the outside to the content side: HDPE layer (120) / PE layer (20) / EVOH layer (75) / PE layer (25) / MDPE layer (60)

[0099] The details of each layer structure described above are as follows: HDPE layer: High density polyethylene layer PE layer: polyethylene layer EVOH layer: Ethylene vinyl alcohol resin layer MDPE layer: Medium density polyethylene layer

[0100] <Method for manufacturing a tube container with a peelable sheet> The peelable sheets of the Examples and Comparative Examples, each having approximately the same dimensions as the body of the above-mentioned tube container body, were pressed against the body of the tube container with a force of 10 kgf using a rotary heat roll (200°C) and thermocompressed, via an easily peelable sealant layer, to produce tube containers with peelable sheets of the Examples and Comparative Examples.

[0101] "evaluation" <Surface roughness> Before sealing the easy-peel sealant layer to the body of the tube container body, the surface roughness of the body of the tube container body was measured. Also, after sealing the easy-peel sealant layer to the body of the tube container body and peeling it off, the surface roughness Ra of the body of the tube container body and the body side of the peelable sheet was measured. Specifically, the surface roughness was measured in accordance with JIS B 0601-2001K as follows. Sample size: 5mm square Equipment used: ET4000A (Kosaka Laboratory) Conditions: Cutoff value: 0.8 mm Feed rate: 0.2mm / s Processing interval: 1600 equal parts per cutoff length

[0102] <Dynamic friction coefficient> The easy-peel sealant layer was sealed to the barrel of the tube container body, and after peeling, the dynamic friction coefficient of the barrel of the tube container body was measured. Specifically, the dynamic friction coefficient was measured in accordance with JIS K 7125 as follows: Sample size: 80mm square Equipment used: HM-3 (manufactured by Toyo Seiki Co., Ltd.) Weight: 200g Top: Test specimen Bottom: Stainless steel plate Test speed: 100mm / min

[0103] Ease of squeezing (usability) An easily peelable sealant layer was sealed to the barrel of a tube container body, and after peeling, the tube container body was filled with the contents (sunscreen cosmetic), and the ease of squeezing out the contents was evaluated. The evaluation results were classified as follows: A: When squeezing the body of the tube container with your fingers to squeeze out the contents, your fingers do not get caught and it is easy to squeeze out. B: When squeezing the body of the tube container with your fingers to squeeze out the contents, your fingers tend to get caught and it is difficult to squeeze out.

[0104] <Visibility of unevenness (design)> An easily peelable sealant layer was sealed to the body of a tube container body, and after peeling, it was evaluated whether the uneven surface of the roughened surface of the body of the tube container body was easily visible. The evaluation results were classified as follows. A: The irregularities on the roughened surface of the tube body are easily visible. B: The irregularities on the roughened surface of the barrel of the tube container body are not easily visible.

[0105] <Evaluation Results> The evaluation results of the above evaluations are shown in Table 1 below.

[0106] [Table 1]

[0107] As is clear from Table 1, in the tube containers of Examples 1 and 2, the easily peelable sealant layer was sealed to the barrel of the tube container body, and after peeling, the barrel of the tube container body had a relatively large arithmetic mean roughness Ra, which resulted in a relatively small dynamic friction coefficient, excellent squeezability (usability), and excellent visibility of the unevenness (design).In contrast, the tube containers of Comparative Examples 1 and 2 did not achieve such excellent effects.

[0108] 《Reference examples 1~6》 In the reference example and the reference comparative example, the effect of joining a peelable sheet in a wound state to the barrel of a tube container body via an easily peelable sealant layer is confirmed.

[0109] As laminates for peelable sheets of Reference Examples 1 to 6, laminates having the following layer configurations were prepared (note that " / / " indicates adhesion with a dry lamination adhesive): PETsiox (12 μm) / / inkPET (12 μm) / ac agent / EMAA (20 μm) / easy-peel sealant layer (intralayer cohesive failure type easy-peel sealant layer) (20 μm)

[0110] The easily peelable sealant layer in Reference Examples 1 to 6, i.e., an easily peelable sealant layer of intralayer cohesive failure type that undergoes cohesive failure within the layer when the peelable sheet is peeled off, is an easy peel sealant for polyethylene (7601EB manufactured by Toray Advanced Film Co., Ltd.).

[0111] The layer structures of the tube container bodies (laminated tubes) of Reference Examples 1 to 5 are as follows: (Front side) LLDPE(50μm) / LDPEf(100μm) / PET(12μm) / EMAA(30μm) / Al(9μm) / EMAA(30μm) / LLDPE(100μm)(Contents side)

[0112] The layer structure of the tube container body (blow tube) of Reference Example 6 is as follows: (Front) LDPE (100 μm) / Acid-modified resin (10 μm) / EVOH (20 μm) / Acid-modified resin (10 μm) / LDPE (100 μm) (Contents side)

[0113] The details of the abbreviations for each layer structure mentioned above are as follows: PETsiox: Silicon oxide-deposited PET layer inkPET: PET layer with printed layer AC agent: anchor coat adhesive LLDPE: Linear low density polyethylene resin layer LDPEf: Low-density polyethylene resin film PET: Polyethylene terephthalate layer EMAA: ethylene-methacrylic acid copolymer Al: Aluminum foil layer LDPE: Low density polyethylene resin layer EVOH: Ethylene-vinyl alcohol copolymer layer

[0114] <Manufacturing method> In Reference Examples 1 to 6, a peelable sheet laminate having approximately the same dimensions as the body of the above-mentioned tube container body was used, and the tube container was pressed against a rotary heat roll (200°C) with a force of 10 kgf via an easily peelable sealant layer to be thermocompressed, thereby producing the tube containers with peelable sheets of Reference Examples 1 to 6.

[0115] In Reference Examples 1 to 4 and 6, a peel trigger (unwelded portion) was provided on the peelable sheet. The locations of the peel triggers are shown in (a) to (d) of Figure 3. The embodiment of Reference Example 5 is shown in (e) of Figure 3.

[0116] Comparative Example 1 A PET shrink label was wrapped around the same blown tube as the tube container of Reference Example 6 to prepare a tube container with a peelable sheet of Reference Comparative Example 1.

[0117] "evaluation" The peelability and feel of the sheet were evaluated in the same manner as in the above Examples and Comparative Examples.

[0118] The configurations and evaluation results of the tube containers with peelable sheets of each of the reference examples and reference comparative examples are shown in Table 2.

[0119] [Table 2]

[0120] As is clear from Table 2, the releasable sheets could be peeled off from all of the tube containers with releasable sheets of Reference Examples 1 to 6, and the feeling of use (squeezeability) was also good. In particular, it was found that in Reference Examples 1 to 4 and 6, the releasable sheets could be easily peeled off by using releasable sheets having a peel trigger. [Explanation of symbols]

[0121] 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H Base material layer 1Fa, 1Ga, 1Ha Base material layer body 1Fb, 1Hb surface layer 1Gc partial printing layer 2A, 2B, 2C, 2D Easy peel layer 10A, 10B, 10C, 10D Peelable sheets 20 Body of tube container body 30 Shoulder of tube container body 40. Spout portion of tube container body 50 tube container body 100 tube containers with peelable sheets

Claims

1. A tube container with a peelable sheet, comprising a tube container body and a peelable sheet, the peelable sheet includes a laminate in which a base layer and an easily peelable layer are laminated, and is wound and joined to the barrel of the tube container body on the side of the easily peelable layer, When the peelable sheet is peeled off from the barrel of the tube container body, at least a part of the easily peelable layer remains on the barrel side, forming a roughened surface having a surface roughness Ra of 0.6 μm or more. Tube container with peelable sheet.

2. 2. The tube container according to claim 1, wherein when the peelable sheet is peeled off from the barrel of the tube container body, the surface of the peelable sheet facing the barrel has a surface roughness Ra of 0.6 μm or more.

3. 2. The tube container according to claim 1, wherein the roughened surface has a dynamic friction coefficient of less than 0.40 μD.

4. The easily peelable layer is an easily peelable sealant layer, and the peelable sheet is heat-sealed in a wound state to the barrel of the tube container body via the easily peelable sealant layer; The tube container according to claim 1.

5. The tube container according to claim 1 , wherein the substrate layer comprises an unbleached paper layer.

6. The tube container according to claim 1 , wherein the easily peelable layer is an interfacial peelable layer.

7. The tube container according to claim 1 , wherein the easily peelable layer is of an intralayer cohesive failure type.

8. The tube container according to claim 1 , wherein the peelable sheet has a peel trigger.

9. 2. The tube container according to claim 1, wherein the peelable sheet is provided with a spiral perforation having the tube container as an axis.

10. The tube container according to any one of claims 1 to 9, wherein the peelable sheet has an indication that the peelable sheet is peelable.

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