Tube container with wound sheet

Abstract

To provide a tube container with a wound sheet, which has an excellent feeling of use and whose sheet can be easily peeled off.SOLUTION: A tube container 100 with a wound sheet comprises a tube container main body 50 and a wound sheet 10. The wound sheet 10 is a laminated body in which a base material layer is laminated on an easy-peelable sealant layer and is joined windingly to a trunk part 20 of the tube container main body 50 through the easy-peelable sealant layer. The easy-peelable sealant layer is an interfacial peeling type which interfacial-peels at an interface between the easy-peelable sealant layer and the base material layer. A portion where winding of the wound sheet around the tube main body begins and a portion where the winding of the wound sheet around the tube container main body ends overlap with each other, so as to form an overlapping part. In at least a portion of the overlapping part, the easy-peelable sealant layer at the portion where the winding ends has a thin-walled portion and a thickness of the thin-walled portion is smaller than a thickness of the easy-peelable sealant layer at a portion where the wound sheet is joined to the tube container main body.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a tube container with a wound sheet, and more particularly to a tube container with a wound sheet having a tube container body and a wound sheet wound around the container.

Background Art

[0002] Tube containers have been conventionally used as containers for various items such as pharmaceuticals, toothpaste, foods, cosmetics, adhesives, and the like. A tube container is generally a tube body formed from a synthetic resin tube blow-molded or extruded into a cylindrical shape, or a tube body formed by winding an aluminum laminate sheet into a cylindrical shape. A head portion in which a mouth tube portion is erected from an upper end opening of a笠状shoulder portion is thermally welded and fixed to an upper end of a cylindrical body portion, and after further filling the contents, the lower end opening of the body portion is often heat-sealed for use.

[0003] Further, with regard to such a tube container, a tube container with a wound sheet in which a sheet for a medium for information such as a pattern or characters and / or a decoration for aesthetics is wound around its body portion has been developed.

[0004] For example, Patent Document 1 discloses a method of extruding a main body of a base tube container and labeling a decorative film on the surface with its residual heat.

[0005] Further, Patent Document 2 discloses a tube container in which a heat-sensitive label decorated with a printing layer is adhesively fixed in a wound shape by heat fusion to a predetermined height range on the outer peripheral surface of the body portion of a pre-formed tube container body.

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

Prior Art Documents

[0007] [Patent Document 1] Special Publication No. 2019-531928 [Patent Document 2] Japanese Patent Publication No. 2010-105692 [Patent Document 3] Japanese Patent Application Publication No. 07-040515 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] The tube containers with wound sheets disclosed in the aforementioned Patent Documents 1 to 3 are all thought to be designed in such a way that the decorative sheet (film or label) does not peel off or fall off the tube container body.

[0009] In contrast, the inventors have found that in the following circumstances, it is preferable to peel the wrapping sheet from the tube container body as needed: for example, when points or marks for product campaigns or sweepstakes are printed on the wrapping sheet and it is necessary to cut off the points or marks in order to enter the campaign or sweepstakes; when the tube container is softened to dispense all of its contents; or when the sheet and the tube container body are to be separated for disposal or recycling.

[0010] Therefore, there is a need for a tube container with a winding sheet that allows the winding sheet to be easily peeled off the tube container body.

[0011] While shrink labels used on PET bottles can be easily peeled off, applying such shrink labels to tube containers can cause problems with usability because the labels tend to lift when the body of the tube is squeezed to push out the contents.

[0012] In contrast, the present invention provides a tube container with a wound sheet that offers a good user experience and allows for easy removal of the wound sheet. [Means for solving the problem]

[0013] The inventors of this invention, after diligent study, found that the above problems could be solved by the following means, and thus completed the present invention. That is, the present invention is as follows.

[0014] <Aspect 1> A tube container with a winding sheet, comprising a tube container body and a winding sheet, The aforementioned wound sheet is a laminate in which a base layer and an easily peelable sealant layer are laminated, and is joined in a wound manner to the body of the tube container via the easily peelable sealant layer. The easily peelable sealant layer is an interfacial peelable type that peels off at the interface between the easily peelable sealant layer and the substrate layer. The starting and ending portions of the winding sheet on the tube container body overlap, forming an overlapping portion, and In at least a portion of the overlapping portion, the easily peelable sealant layer at the end of the winding has a thin-walled portion, and the thickness of the thin-walled portion is thinner than the thickness of the easily peelable sealant layer in the portion where the winding sheet is joined to the tube container body. Tube container with a wound sheet. <Aspect 2> The tube container with a wound sheet according to Embodiment 1, wherein the thickness of the thin-walled portion is 50% or less of the thickness of the easily peelable sealant layer in the portion where the wound sheet is joined to the tube container body. <Aspect 3> A tube container with a wound sheet according to embodiment 1 or 2, wherein the wound sheet has a peeling trigger in the overlapping portion. <Aspect 4> A tube container with a winding sheet according to any one of embodiments 1 to 3, wherein the winding sheet is provided with spiral perforations that are axial around the tube container. <Aspect 5> The wound sheet tube container according to any one of Aspects 1 to 4, wherein the wound sheet has an indication that the wound sheet is peelable.

Advantages of the Invention

[0015] According to the present invention, it is possible to provide a wound sheet tube container that can achieve both usability and peelability of the wound sheet.

Brief Description of the Drawings

[0016] [Figure 1] FIG. 1 is a front view showing one aspect of the wound sheet tube container of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view of the body of the tube container and the wound sheet sealed by heat in one aspect of the wound sheet tube container of the present invention. [Figure 3] FIG. 3 is a schematic cross-sectional view showing the state of peeling of the wound sheet from the body of the tube container in one aspect of the wound sheet tube container of the present invention. [Figure 4] FIG. 4 is a schematic cross-sectional view showing the state of peeling of the wound sheet from the body of the tube container in one aspect of a wound sheet tube container different from the present invention. [Figure 5] FIG. 5 is an image diagram showing the state of the peeling trigger of each of the wound sheet tube containers of Reference Examples 1 to 6.

Embodiments for Carrying Out the Invention

[0017] 《Wound Sheet Tube Container》 The wound sheet tube container of the present invention is A wound sheet tube container having a tube container body and a wound sheet, The wound sheet is a laminate in which a base material layer and an easily peelable sealant layer are laminated, and is wound and joined to the body of the tube container via the easily peelable sealant layer. The easily peelable sealant layer is an interfacial peeling type, where it peels off at the interface between the easily peelable sealant layer and the substrate layer. The starting and ending points of the winding sheet on the tube container body overlap, forming an overlapping section, and In at least a portion of the overlapping area, particularly over 10%, 30%, 50%, 70%, 90%, or approximately 100% of the length in the direction intersecting the winding direction of the winding sheet to the tube container body, the easily peelable sealant layer at the end of the winding has a thin-walled portion, and the thickness of the thin-walled portion is thinner than the thickness of the easily peelable sealant layer in the portion where the winding sheet is joined to the tube container body, for example, 50% or less, 40% or less, 30% or less, 20% or less, 10% or less, or 5% or less of the thickness of the easily peelable sealant layer in the portion where the winding sheet is joined to the tube container body. Tube container with wound sheet That is the case.

[0018] In this invention, the "base layer" refers to the portion of the winding sheet other than the easily peelable sealant layer. Therefore, the base layer may be a single layer, but is generally a laminate of multiple layers.

[0019] Furthermore, in the present invention, the state in which the wound sheet is joined to the body of the tube container in a wound manner refers to a state in which the sheet is joined in a wound manner, regardless of the method by which the wound sheet is wrapped around the body of the tube container. Therefore, the joined portion may be a full-surface joint or a striped joint.

[0020] In one embodiment, as shown in Figure 1, a front view illustrating one aspect of the tube container with a wound sheet of the present invention, the tube container with a wound sheet 100 of the present invention comprises a tube container body 50 and a wound sheet 10.

[0021] Furthermore, as shown in Figure 2, a schematic cross-sectional view of the wound sheet, the wound sheet 10 is a laminate in which a base layer 1 and an easily peelable sealant 2 are laminated, and is joined to the body portion 20 of the tube container body in a wound manner via the easily peelable sealant layer 2.

[0022] Thus, in the tube container 100 with a wound sheet of the present invention, since the wound sheet 10 is joined to the body portion 20 of the tube container in a wound manner, the wound sheet 10 does not float up even when the body portion 20 is squeezed, meaning that it has a good feel when used. Furthermore, when peeling off the wound sheet 10, the wound sheet 10 can be easily peeled off from the tube container by interfacial peeling of the easy-peel sealant layer 2.

[0023] The tube container with a wound sheet of the present invention (hereinafter also simply referred to as "the tube container of the present invention") can provide the tube container body with the effect of the base material layer of the wound sheet, since the wound sheet is joined to the tube container body in a wound manner.

[0024] Specifically, for example, the base layer can be used as a medium for information such as patterns and characters, and / or as decoration for aesthetic purposes.

[0025] Furthermore, the tube container of the present invention has one or more of the following advantages (1) to (9), as the wound sheet is a laminate in which a base layer and an easily peelable sealant layer are laminated, and is joined in a wound manner to the body of the tube container via the easily peelable sealant layer.

[0026] (1) Strengthening barrier properties In the tube container of the present invention, the barrier properties of the entire tube container can be improved by using a barrier layer in the base layer. Examples of such barrier layers include aluminum foil or PET film with a vapor-deposited film.

[0027] (2) Use of various decorative layers In the tube container of the present invention, since the base layer has a decorative layer, decorative layers that were difficult to use in conventional laminate tubes, such as embossed PET film and PET film with a hologram vapor deposition film, can be used.

[0028] Furthermore, in the tube container of the present invention, paper can be used in the base layer. In this case, by peeling the winding sheet from the tube container body, the winding sheet can be separated and disposed of as paper waste, and / or the container body can be separated and disposed of as plastic waste. Moreover, in the tube container of the present invention, if paper is used in the base layer of the winding sheet, a paper tube can be constructed that can be handled as paper waste without separation by making the tube container body the minimum necessary thickness.

[0029] (3) Improved production efficiency / Small lot production Conventional blow-molded tubes and laminated tubes have a printed layer provided by direct printing. Therefore, if the design needs to be changed, for example, the printing plate must be changed each time. In contrast, with the tube container of the present invention, by using a wound sheet, the design can be changed simply by switching the printed wound sheet.

[0030] Furthermore, regarding printing, the tube container of the present invention does not form side seams with a laminated structure like conventional laminate tubes. Therefore, printing methods that would be functionally insufficient (in this case, insufficient laminate strength or ink adhesion) when considering conventional side seams, such as digital printing, can be used.

[0031] Therefore, with the tube container of the present invention, digital printing not only enables handling of small-lot, high-mix production and short delivery times, but also leads to a reduction in printed defects.

[0032] (4) Thinning of the tube container body and reduction of resin usage In the tube container of the present invention, by wrapping a highly rigid wound sheet around the body of the tube container, the tube container can be made self-supporting even if the tube container body is made thin.

[0033] 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.

[0034] (5) Improvement of the ability to separate and dispose of tube containers Conventionally, tube containers with a winding sheet, where the winding sheet and the tube container body cannot be separated, were generally treated as combustible waste. In contrast, the tube container of the present invention allows for the separation and disposal of the winding sheet and the tube container body. This separate disposal also reduces the amount of combustible waste to be generated.

[0035] (6) Easy disposal In the tube container of the present invention, the tube container can be disposed of compactly by making the tube container body thinner.

[0036] (7) Contributes to complete use In the tube container of the present invention, the contents can be easily squeezed out from the tube container body, which has become relatively softer after peeling off the wound sheet (making it possible to create a thin, easy-to-squeeze-out state at the end).

[0037] (8) Provision of supplementary information such as advertisements and product descriptions In the tube container of the present invention, by making the overlapping portion of the wound sheet longer (larger), additional information such as advertisements and instructions can be provided in this portion.

[0038] (9) Product campaign information and "lottery" entries on the reel sheet. In the tube container of the present invention, campaign information or lottery tickets for the product can be printed on the winding sheet, making it easier for users to peel off the winding sheet and participate in the lottery.

[0039] Furthermore, in the tube container of the present invention, the starting and ending portions of the winding sheet onto the tube container body overlap, forming an overlapping portion, and in at least a part of the overlapping portion, the easily peelable sealant layer at the end of the winding has a thin-walled portion, and the thickness of the thin-walled portion is thinner than the thickness of the easily peelable sealant layer in the portion where the winding sheet is joined to the tube container body, thereby enabling smooth removal of the winding sheet.

[0040] Specifically, as shown in Figure 3, in the tube container of the present invention, in at least a portion of the overlapping area, the easily peelable sealant layer at the end of the winding has a thin-walled portion of thickness "B" in a direction intersecting the winding direction of the winding sheet to the tube container body, and the thickness of this thin-walled portion of thickness "B" is thinner than the thickness "A" of the easily peelable sealant layer in the portion where the winding sheet is joined to the tube container body (Figure 3(a)).

[0041] Therefore, by pinching the end of the winding (10b) and pulling it up as indicated by the white arrow, interfacial delamination can be performed at the interface between the easily peelable sealant layer (2b) and the substrate layer (1b) of the end of the winding (10b) (Figures 3(b) and (c)).

[0042] In this tube container of the present invention, in at least a portion of the overlapping section, the easily peelable sealant layer at the end of the winding section has a thin section of thickness "B". As the easily peelable sealant layer breaks at this thin section (sometimes referred to as "edge breakage"), the peeling interface easily transitions from the interface between the easily peelable sealant layer (2b) at the end of the winding section (10b) and the base material layer (1a) at the start of the winding section (10a) to the interface between the easily peelable sealant layer (2b) at the end of the winding section (10b) and the base material layer (1b) (Figures 3(b) and (c)), thus enabling smooth removal of the wound sheet.

[0043] In contrast, as shown in Figure 4, if the tube container with the wound sheet does not have a thin-walled section of thickness "B", when the peeling interface easily transitions from the interface between the easily peelable sealant layer (2b) at the end of the winding (10b) and the base layer (1a) at the start of the winding (10a) to the interface between the easily peelable sealant layer (2b) at the end of the winding (10b) and the base layer (1b) (Figures 4(b) and (c)), the relatively thick easily peelable sealant layer (2b) must be broken, which can make it difficult to peel the wound sheet smoothly and stably.

[0044] The following describes each component of the tube container with a wound sheet according to the present invention.

[0045] <Wrap-around sheet> The wound sheet according to the present invention is a laminate in which a base layer and an easily peelable sealant layer are laminated.

[0046] (base material layer) The wound sheet according to the present invention is a laminate in which a base layer and an easily peelable sealant layer are laminated together. Therefore, as described above, in the present invention, the "base layer" refers to the portion of the layers constituting the wound sheet other than the easily peelable sealant layer.

[0047] Furthermore, the "base layer" may be a layer that provides the wound sheet of the present invention with appropriate handling properties, strength, durability, etc., provides necessary functions such as barrier properties, and functions as a support when printing is performed. Therefore, the base layer may be a single layer, but is generally a laminate of multiple layers.

[0048] The material constituting the base layer is not particularly limited, but can be selected from materials that have sufficient flexibility to follow the squeeze deformation of the tube container without any discomfort. Alternatively, the material constituting the base layer may be selected from materials that can withstand the heat during heat sealing, for example, when joining the wound sheets with an easily peelable sealant layer by heat sealing.

[0049] In the present invention, the thickness of the base material layer is not particularly limited. For example, from the viewpoint of providing durability to the wound sheet, it may be 1 μm or more, 5 μm or more, 10 μm or more, or 20 μm or more. From the viewpoint of providing flexibility to the sheet, it may be 100 μm or less, 50 μm or less, 40 μm or less, or 30 μm or less.

[0050] The base layer may have one or more film layers and paper layers.

[0051] More specifically, examples of films used in the base layer include polyethylene film, polypropylene film, polyester film, particularly polypropylene film such as biaxially oriented polypropylene film, or polyester film such as biaxially oriented polyethylene terephthalate film.

[0052] Furthermore, the paper used in the base layer is not limited to general paper made from plant fibers such as pulp, but can also include paper manufactured from animal fibers such as wool and silk, paper manufactured from polymer fibers, and paper manufactured from inorganic fibers such as glass fibers.

[0053] In addition to the film layer and paper layer, the base material layer may further include other layers for the purpose of providing additional functionality. Examples of other layers include, but are not limited to, a barrier layer such as aluminum foil and an adhesive layer such as a urethane-based adhesive.

[0054] The base layer may have printed text information, symbols, marks, etc., on the surface of one or more layers constituting the base layer. The base layer may also have a decorative layer that can be observed from the outside of the tube container when the winding 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 adds appearance (decoration) such as patterns, colors, and gloss. In relation to the present invention, a layer on which only text information, symbols, marks, etc., are printed, and which does not add appearance such as patterns, colors, and gloss, does not fall under the category of a "decorative layer".

[0055] The decorative layer may be any of the following or a combination thereof: • Printed film layer or paper layer • Coated film layer or paper layer • Film or paper layer with a thin film (e.g., film or paper layer with a vapor-deposited film, film or paper layer with plating, film or paper layer with a sputtered film, film or paper layer with metal foil, film or paper layer with silver mirror coating) • Decorative film layer or paper layer (e.g., matte film layer, polarizing film layer, embossed film layer, colored film layer or paper layer)

[0056] Examples of vapor-deposited films in the film layer or paper layer with a thin film include aluminum vapor-deposited films, silica vapor-deposited films, alumina vapor-deposited films, and silica-alumina binary vapor-deposited films. Examples of metal foils in the film layer or paper layer with a thin film include gold foil, silver foil, copper foil, and aluminum foil.

[0057] (Easily peelable sealant layer) In the present invention, the easily peelable sealant layer is a layer through which a wound sheet is joined in a wound manner to the body of a tube container.

[0058] Here, the "easily peelable sealant layer" refers to a layer that allows the wrapped sheet to be easily peeled off by hand from the state in which the wrapped sheet is heat-sealed to the body of the tube container. In the present invention, the peel strength when peeling off the wrapped 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, and may also be 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. Note that "peel strength" refers to the peel strength when peeled 180° according to the method specified in, for example, JIS-Z-0238.

[0059] In the present invention, the thickness of the easily peelable sealant layer is not particularly limited and can be selected considering usability when using a tube container (squeeze durability), ease of peeling when peeling off a wound sheet, etc. For example, the thickness of the easily peelable sealant layer may be 1 μm or more, 5 μm or more, 10 μm or more, or 20 μm or more, and may also be 100 μm or less, 50 μm or less, 40 μm or less, or 30 μm or less.

[0060] In the present invention, the easily peelable sealant layer may be a single layer or a laminate of multiple layers (for example, two or more layers, three or more layers, or four or more layers, and ten or fewer layers, eight or fewer layers, six or fewer layers, or five or fewer layers).

[0061] Furthermore, in the present invention, the easily peelable sealant layer is of the interfacial peeling type, which peels off at the interface between the easily peelable sealant layer and the substrate layer. Therefore, in the tube container of the present invention, when the winding sheet is peeled off from the tube container body, the easily peelable sealant layer remains on the tube container side.

[0062] In the present invention, if the easily peelable sealant layer is an interfacial peelable type, the transparency of the body of the tube container after peeling can be maintained, and therefore it is preferable to use it in combination with a transparent blow-molded tube container. In the tube of the present invention, the easily peelable sealant layer remains on the tube container body side, but because the surface of the easily peelable sealant layer is smooth, the transparency of the body of the tube container body after peeling can be maintained.

[0063] In the present invention, the material constituting the easily peelable sealant layer is not particularly limited and may be appropriately determined based on the type of "interfacial peelable easily peelable sealant layer".

[0064] More specifically, the material constituting the interfacial peelable sealant layer may be selected from a mixture of polyolefin resin and cyclic olefin copolymer in any ratio. Furthermore, the ratio of cyclic olefin copolymer to the total of polyolefin resin and cyclic olefin copolymer may be, for example, 1.0 to 50% by mass, particularly 1.0 to 20% by mass, 1.0 to 10% by mass, or 3.0 to 10% by mass.

[0065] Here, polyolefin resins include, more specifically, ethylene resins such as low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), linear low-density polyethylene resin (LLDPE), ethylene-vinyl acetate copolymer resin (EVA), and ethylene-α-olefin copolymer, as well as polypropylene resins such as homopolypropylene resin, propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer, and polybutene, but are not limited to these. Furthermore, these may be used individually or as blended materials with these as the main raw materials.

[0066] Furthermore, 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. Preferably, the cyclic olefin copolymer is a copolymer in which at least one cyclic olefin and at least one vinyl compound other than a cyclic olefin are used as monomers. The cyclic olefin copolymer may be a cyclic olefin-based random copolymer (COC) obtained by addition polymerization using at least one cyclic olefin and at least one vinyl compound other than a cyclic olefin as monomers, or it may be 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 the fused ring skeleton and at least one unsaturated compound other than said compound as monomers.

[0067] When a cyclic olefin copolymer is a cyclic olefin random copolymer (COC) obtained by addition polymerization, the cyclic olefin used as the monomer is not particularly limited, but examples 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, as well as polycyclic cycloolefins such as tetracyclododecene and norbornene, and their derivatives.

[0068] Furthermore, vinyl compounds other than cyclic olefins that can serve as comonomers for cyclic olefin random copolymers (COCs) are not particularly limited, but examples 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 with two unsaturated bonds; and linear or branched dienes such as butadiene and isoprene.

[0069] When a cyclic olefin-based random copolymer (COC) is used as the material for the interfacial peelable sealant layer, the proportion of structural units derived from the cyclic olefin is preferably 15 to 60 mol%, and more preferably in the range of 25 to 50 mol%.

[0070] Furthermore, when the cyclic olefin copolymer is a cyclic olefin ring-opening polymer obtained by ring-opening polymerization or a hydrogenated product thereof (COP), the compound having a double bond in the fused ring skeleton that becomes the monomer is not particularly limited as long as it can be polymerized by a metasense polymerization catalyst. Examples include compounds having a norbornene-based skeleton such as tetracyclododecene, norbornene, or derivatives thereof.

[0071] Furthermore, the unsaturated compounds other than those having a double bond in the fused ring skeleton that serve as comonomers for cyclic olefin ring-opening polymers are not particularly limited as long as they can be polymerized by a metasense polymerization catalyst. Examples include cyclic olefins that serve as monomers for the above-mentioned cyclic olefin-based random copolymers (COCs), cyclic dienes, monomers having a carbon-carbon double bond in the main chain, and derivatives thereof.

[0072] Furthermore, cyclic olefin ring-opening polymers have a carbon-carbon double bond (C=C) in their main chain. When hydrogenation is performed, a hydrogenated product (COP) can be obtained in which the double bond in the main chain is replaced by a carbon-carbon single bond (CC). From the viewpoint of heat resistance, weather resistance, etc., a polymer in which at least the carbon-carbon double bond in the main chain is hydrogenated may also be used.

[0073] When using a cyclic olefin ring-opening polymer or its hydrogenated product (COP), it is preferable that the proportion of structural units derived from a compound having a double bond in the fused ring skeleton is 80% by mass or more, considering that it will be subjected to a hydrogenation reaction.

[0074] (Manufacturing method for wound sheets) In the wound sheet according to the present invention, the method for forming the laminate in which the base layer and the easily peelable sealant layer are laminated is not particularly limited, and for example, a dry lamination method, a sand lamination method, or a co-extrusion film molding method may be used. In addition, commercially available sheet molded products may be used as each layer or as the laminate.

[0075] (Trigger for peeling) In the present invention, from the viewpoint of improving the ease of peeling off the wound sheet, the wound sheet may have a peeling trigger, or it may be provided with helical perforations with the tube container body as the axis, or it may have both.

[0076] The winding sheet can be more easily peeled off the tube container body by having a peeling trigger. In particular, it is preferable that the winding sheet has a peeling trigger when the tube container body contains a metal material on its surface.

[0077] In the present invention, the peeling trigger is not particularly limited and may be, for example, the following: (i) When heat-sealing a wound sheet to the body of a tube container, a region of the easily peelable sealant layer of the wound sheet that is not heat-sealed or a region that is heat-sealed less strongly than other regions can be used as the peeling trigger; (ii) A welding-inhibiting layer such as a peeling varnish can be provided on a part of the easily peelable sealant layer of the wound sheet and this can be used as the peeling trigger.

[0078] Furthermore, from the viewpoint of improving the ease of peeling off the wound sheet, it is preferable that at least a portion of the peeling triggers are located at the joints of the wound sheet. Here, the joints of the wound sheet refer to the opposing or overlapping portions of both ends of the sheet in the winding direction when the wound sheet is heat-sealed to the body of the tube container in a wound manner. That is, the ends of this wound sheet may be (i) arranged with a certain distance between them, (ii) tightly connected, or (iii) overlapped. For example, if there is an easily peelable sealant layer that undergoes cohesive failure within the layer when the easily peelable sealant layer is peeled off, the joint may be of any of the above types (i) to (iii). Also, if there is an easily peelable sealant layer that undergoes interfacial peeling when the easily peelable sealant layer is peeled off, it is preferable that the joint is of the above type (i) or (ii).

[0079] (display) In the present invention, the rolled sheet may have an indication that it is peelable. More specifically, the rolled sheet may have an indication that it is peelable, a method for peeling it off, that it can be peeled off and disposed of separately, or that it can be peeled off and a specific part can be used for applications, etc. Such indications can provide convenience to users, etc.

[0080] Furthermore, the winding sheet can have an indication that it can be peeled off from the tube container body at the overlapping portion by pressing the side of the winding start portion near the overlapping portion to deform the body of the tube container body.

[0081] Such markings can be made by printing on one or more layers that make up the base material layer, and the form of the marking may be a marking consisting only of text, a marking consisting only of symbols, marks, etc., or a combination thereof.

[0082] <Tube container body> In the present invention, the tube container is used as a container for filling with contents such as pharmaceuticals, toothpaste, food, cosmetics, or adhesives.

[0083] Therefore, the tube container body has a body portion and a spout portion. Depending on the design and practicality, for example, it may also have a shoulder portion between the body portion and the spout portion. For example, as shown in Figure 1, the tube container body 50 has a body portion 20, a shoulder portion 30, and a spout portion 40.

[0084] In the present invention, the tube container body may be a laminated tube, a single-layer or multi-layer extruded tube, or a single-layer or multi-layer blow-molded tube. Furthermore, the laminate or single layer for forming the tube container body may include a layer made of resin material and a layer made of metal material. If there are multiple layers for forming the tube container body, each layer may contain the same material or different materials.

[0085] Method for manufacturing tube containers with wound sheets The method for manufacturing the tube container with a wound sheet according to the present invention is not particularly limited.

[0086] Therefore, for example, the tube container with a wound sheet of the present invention can be manufactured by preparing a tube container body and a laminate for the wound sheet, and then using a rotary heat roll to heat-seal the wound sheet to the body of the tube container body in a wound manner by heat-pressing the easily peelable sealant layer of the wound sheet facing the body of the tube container body.

[0087] The temperature during heat bonding is not particularly limited and may be, for example, 100 to 300°C. Similarly, the force applied during heat bonding is not particularly limited and may be, for example, 5 to 20 kgf. [Examples]

[0088] The present invention will be described below using examples and comparative examples, but the present invention is not limited to these.

[0089] Examples and Comparative Examples A laminate with the following layer structure was prepared as the winding sheet (note that " / / " indicates bonding with dry laminating adhesive).

[0090] <Wrap-around sheet 1> PET layer (12 μm) / / AL layer (9 μm) / / PET layer (12 μm) / Easy-peel sealant layer (15 μm) <Rewinding Sheet 2> PET layer (12 μm) / / AL layer (9 μm) / / PET layer (12 μm) / Easy-peel sealant layer (20 μm) <Wrap-around sheet 3> PET layer (12 μm) / Easy-peel sealant layer laminate (65 μm)

[0091] Details of each layer configuration described above are as follows: AL layer: Aluminum foil layer PET layer: Polyethylene terephthalate layer Easy-peel sealant layer: Toray Film Processing Co., Ltd. 7601EB (Easy-peel sealant for polyethylene with in-layer cohesive disruption) Laminate with easily peelable sealant layer: A laminate of the above-mentioned easily peelable sealant layer (15 μm) (PET layer side) and a linear low-density polyethylene layer (50 μm) (tube container body side).

[0092] The layered structure of the blown tube used as the main body of the tube container in the examples and comparative examples is as follows, from the outside towards the contents side: Front side: LDPE layer (100 μm) / Acid-modified resin layer (10 μm) / EVOH layer (20 μm) / Acid-modified resin layer (10 μm) / LDPE layer (100 μm)

[0093] Details of each layer configuration described above are as follows: LDPE layer: Low-density polyethylene layer Acid-modified resin layer: Acid-modified polyethylene layer EVOH layer: Ethylene vinyl alcohol resin layer

[0094] "evaluation" <Evaluation of easily peelable sealant layer fracture resistance> The fracture resistance (edge ​​breakage) of the easily peelable sealant layer of wound sheets 1-3 was evaluated as follows.

[0095] An easily peelable sealant layer or an easily peelable sealant layer laminate of a wound sheet was heat-sealed to the surface of the outermost PET layer of the wound sheet using a hot roll under the conditions of an upper roll temperature of 180°C, a lower roll temperature of 60°C, a rotation speed of 1 m / min, and a pressure of 0.2 MPa, forming an overlapping section with a thin wall. Subsequently, the heat-sealed sample was cut to a width of 15 mm, the overlapping section was peeled off, and the breaking strength required to rupture the easily peelable sealant layer of the thin wall was measured under the following conditions.

[0096] Measurement conditions: Tensile speed: 300 m / min, distance between chucks: 50 mm, 90° peeling. Measuring instrument: Toyo Seiki Strograph VGS05E

[0097] Furthermore, we evaluated whether stringing (elongation of the easily peelable sealant layer) occurred when the easily peelable sealant layer was fractured in this manner.

[0098] <Evaluation Results> The evaluation results for winding sheets 1-3 are shown in Table 1. Regarding stringiness, "0 / 5" indicates that no stringiness occurred in any of the five samples, while "2 / 5" indicates that stringiness occurred in two out of the five samples.

[0099] [Table 1]

[0100] As is clear from Table 1, when the thickness of the thin portion of the easily peelable sealant layer was thinner than the thickness of the other portions of the easily peelable sealant layer, and especially when the thickness of the thin portion of the easily peelable sealant layer was 50% or less of the thickness of the other portions of the easily peelable sealant layer, the fracture properties (edge ​​breakage properties) of the easily peelable sealant layer were good.

[0101] 《Reference examples 1~6》 The reference examples and reference comparative examples confirm the effect of joining a wound sheet to the body of a tube container via an easily peelable sealant layer in a wound manner.

[0102] As laminates for winding sheets in Reference Examples 1-6, laminates with the following layer configurations were prepared (note that " / / " indicates bonding by dry laminating adhesive): PETsiox (12 μm) / / inkPET (12 μm) / ac agent / EMAA (20 μm) / easily peelable sealant layer (easily peelable sealant layer with intralayer cohesive breakdown) (20 μm)

[0103] The easily peelable sealant layers in these reference examples 1-6, that is, the easily peelable sealant layers of the type that undergo cohesive failure within the layer when the wound sheet is peeled off, are polyethylene easy-peel sealant (7601EB manufactured by Toray Film Processing Co., Ltd.).

[0104] The layer structure of the tube container body (laminated tube) in Reference Examples 1-5 is as follows: (Front side) LLDPE(50μm) / LDPEf(100μm) / PET(12μm) / EMAA(30μm) / Al(9μm) / EMAA(30μm) / LLDPE(100μm)(Contents side)

[0105] The layer structure of the tube container body (blow tube) in Reference Example 6 is as follows: (Front side) LDPE (100 μm) / Acid-modified resin (10 μm) / EVOH (20 μm) / Acid-modified resin (10 μm) / LDPE (100 μm) (Contents side)

[0106] The details of the abbreviations for each layer structure described above are as follows: PETsiox: PET layer with deposited silicon oxide 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-methacrylate copolymer Al: Aluminum foil layer LDPE: Low-density polyethylene resin layer EVOH: Ethylene-vinyl alcohol copolymer layer

[0107] <Manufacturing method> In Reference Examples 1 to 6, a laminate for a winding sheet, approximately the same size as the body of the tube container described above, was used. The tube container was then pressed against a rotary heat roll (200°C) with a force of 10 kgf via an easily peelable sealant layer to heat-seal the tube container, thereby producing the winding sheet-attached tube containers of Reference Examples 1 to 6.

[0108] In Reference Examples 1-4 and 6, peeling triggers (unwelded areas) were provided in the wound sheet. The locations of each peeling trigger are shown in Figures 5(a) to (d). The configuration of Reference Example 5 is shown in Figure 5(e).

[0109] Reference Example 1 A PET shrink label was wrapped around the same blow-molded tube as the tube container in Reference Example 6 to produce the tube container with a wrapped sheet as in Reference Comparative Example 1.

[0110] "evaluation" The peelability and usability of the sheets were evaluated as described in the above examples and comparative examples.

[0111] The configuration and evaluation results of the wound sheet-attached tube containers for each reference example and reference comparison are shown in Table 2.

[0112] [Table 2]

[0113] As is clear from Table 2, all of the tube containers with wrapped sheets in Reference Examples 1 to 6 were found to have their wrapped sheets peeled off, and also exhibited good usability (squeeze-following ability). In particular, in Reference Examples 1 to 4 and 6, it was found that the wrapped sheets could be easily peeled off by using wrapped sheets that had a peeling trigger.

[0114] 《Reference example 7》 As a laminate for the wound sheet in Reference Example 7, a laminate with the following layer configuration was prepared (note that " / / " indicates bonding by dry laminating adhesive): Paper (80g / m 2 ) / / PET (12μm) / Interfacial peel-type easily peelable sealant layer (20μm) / PE layer (sealant layer) (30μm)

[0115] The easily peelable sealant layer in Reference Example 7 includes an interfacial peelable easily peelable sealant layer and a polyethylene layer (sealant layer). When this easily peelable sealant layer in Reference Example 7 is heat-welded to a blow tube and then peeled off, the "interfacial peelable easily peelable sealant layer / polyethylene layer (sealant layer)" remains on the body of the tube container, while the "paper / PET" is peeled off.

[0116] Furthermore, the interfacial peel-type easily peelable sealant layer is a layer made of a mixed resin of LDPE and COC (LDPE:COC (mixing mass ratio) = 95:5), with petrocene 226 (manufactured by Tosoh Corporation) used as the LDPE (low-density polyethylene) and Apel 6013B (manufactured by Mitsui Chemicals, Inc.) used as the COC (cyclic olefin random copolymer produced by addition polymerization).

[0117] The same tube container body (blow tube) used in Reference Example 7 was the same as that used in Reference Example 6.

[0118] A tube container with a wound sheet, as shown in Reference Example 7, was fabricated in the same manner as the tube container with a wound sheet, as shown in Reference Example 6.

[0119] Comparative evaluation of examples 6 and 7. As described above, in Reference Example 6, the easily peelable sealant layer is an easily peelable sealant layer of the type that causes intralayer cohesive failure, and in Reference Example 7, the easily peelable sealant layer is an easily peelable sealant layer of the type that causes interfacial peeling. Below, we compare the additional effects when the type of peeling is different using Reference Examples 6 and 7.

[0120] More specifically, the wrapped sheet was peeled off from each of the tube containers with wrapped sheets in Reference Examples 6 and 7 using a peeling trigger. Next, the "visibility of contents" and "ease of squeezing" of each tube container were evaluated.

[0121] <Visibility of contents> The visibility of the contents inside the body of the tube container after the winding sheet has been removed was evaluated by calculating the haze value based on JIS K 7361-1997. A smaller haze value indicates higher transparency, i.e., higher visibility of the contents inside the body of the tube container. The evaluation criteria were as follows. The results are shown in Table 3. A: Haze value is 80% or higher; B: Haze value is less than 70%.

[0122] <Ease of squeezing out> The ease of squeezing the contents (grated ginger) from the body of each tube container after removing the winding sheet was compared by manually squeezing the contents from each tube container according to the following criteria. The results are shown in Table 3. A: The material was smooth to the touch when squeezing, allowing the contents to be squeezed out easily. B: The grip on the hand when squeezing was slightly inferior to "A," and there was a feeling of resistance when squeezing out the contents.

[0123] [Table 3]

[0124] As is clear from Table 3, in terms of visibility of the contents, Reference Example 7, which uses an interfacial peeling type easily peelable resin, is superior to Reference Example 6, which uses an intralayer cohesive breaking type easily peelable resin. In other words, it was found that an additional effect is obtained in which the contents filled in the tube container can be squeezed out while being confirmed.

[0125] Furthermore, from the standpoint of ease of squeezing, Reference Example 6, which uses an easily peelable resin with intralayer cohesive breakdown, is superior to Reference Example 7, which uses an easily peelable resin with interfacial peeling, and it was found that an additional effect is obtained in that the contents filled in the tube container are easier to squeeze out. [Explanation of Symbols]

[0126] 1 Base material layer 1a Starting point for wrapping the base layer 1b End of wrapping of the base layer 2. Easy-peel sealant layer 2a Starting point for wrapping the easily peelable sealant layer 2b End of wrapping of the easily peelable sealant layer 10 rolls per sheet 10a Starting point of winding the sheet 10b End of winding of the winding sheet 20 Body of the tube container 30 Shoulder portion of the tube container body 40. Dispensing spout of the tube container body 50 Tube container body 100-wrap tube container with sheet

Claims

1. A tube container with a winding sheet, comprising a tube container body and a winding sheet, The aforementioned wound sheet is a laminate in which a base layer and an easily peelable sealant layer are laminated, and is joined in a wound manner to the body of the tube container via the easily peelable sealant layer. The easily peelable sealant layer is an interfacial peelable type that peels off at the interface between the easily peelable sealant layer and the substrate layer. The starting and ending portions of the winding sheet on the tube container body overlap, forming an overlapping portion, and In at least a portion of the overlapping portion, the easily peelable sealant layer at the end of the winding portion has a thin-walled portion, and the thickness of the thin-walled portion is thinner than the thickness of the easily peelable sealant layer in the portion where the winding sheet is joined to the tube container body, and in the overlapping portion, the base material layer at the beginning of winding the winding sheet to the tube container body and the easily peelable sealant layer at the end of winding the winding sheet to the tube container body are joined, and as a result, when the end of winding the winding sheet is grasped and pulled up, the peeling interface in the thin-walled portion moves from the interface between the easily peelable sealant layer at the end of winding and the base material layer at the beginning of winding to the interface between the easily peelable sealant layer at the end of winding and the base material layer at the end of winding. Tube container with a wound sheet.

2. The tube container with a wound sheet according to claim 1, wherein the thickness of the thin-walled portion is 50% or less of the thickness of the easily peelable sealant layer in the portion where the wound sheet is joined to the tube container body.

3. The tube container with a wound sheet according to Claim 2, wherein the thickness of the thin-walled portion is 30% or less of the thickness of the easily peelable sealant layer in the portion where the wound sheet is joined to the tube container body.

4. The tube container with a wound sheet according to any one of claims 1 to 3, wherein the wound sheet has a peeling trigger in the overlapping portion.

5. The tube container with a wound sheet according to any one of claims 1 to 4, wherein the wound sheet is provided with spiral perforations with the tube container as the axis.

6. The tube container with a winding sheet according to any one of claims 1 to 5, wherein the winding sheet has an indication that the winding sheet is peelable.

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