JP7843615B2 - Tube container with wound sheet - Google Patents

Description

This 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 wrapped around the container.

Tube containers have been used for a long time as containers for many products, including pharmaceuticals, toothpaste, food, cosmetics, and adhesives. Generally, tube containers are formed from a synthetic resin tube blow-molded or extruded into a cylindrical shape, or from an aluminum laminate sheet wound into a cylindrical shape. A head section, with a mouth tube extending from the upper opening of a cap-shaped shoulder, is heat-welded to the upper end of the cylindrical body. After filling with contents, the lower opening of the body is heat-sealed.

Furthermore, regarding such tube containers, tube containers with a wound sheet have been developed, in which a sheet serving as a medium for information such as patterns and characters, and/or as decorative elements for aesthetic purposes, is wound around the body of the container.

For example, Patent Document 1 discloses a method in which a decorative film is applied to the surface of a base tube container while the main body is extruded, using the residual heat.

Furthermore, Patent Document 2 discloses a tube container in which a thermal label decorated with a printed layer is heat-sealed and fixed in a wound manner to a predetermined height range on the outer circumferential surface of the body of a pre-formed tube container.

Furthermore, Patent Document 3 discloses a decorated polyethylene tube container characterized in that a decorative (embellishment) film is wrapped around the body of the polyethylene tube container via an adhesive layer adjacent to the decorative layer, with the starting and ending points of the wrapping overlapping.

Special table 2019-531928 publication Japanese Patent Publication No. 2010-105692 Japanese Patent Application Publication No. 07-040515

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 detach from the tube container body.

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 softening the tube container to completely empty the contents inside; or when separating the sheet from the tube container body for disposal or recycling.

Therefore, a tube container with a winding sheet that allows for easy removal of the winding sheet from the tube container body is required.

Furthermore, shrink labels used on PET bottles and similar containers can be easily peeled off. However, when such shrink labels are applied to tube containers, the label tends to lift when the tube is squeezed to dispense the contents, resulting in a problem with usability.

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.

The inventors, after diligent research, discovered 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:

<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 part of the overlapping portion, the easily peelable sealant layer at the ending 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.
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>
The 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 tube container with a winding sheet according to any one of embodiments 1 to 4, wherein the winding sheet has an indication that the winding sheet is peelable.

According to the present invention, it is possible to provide a tube container with a wound sheet that achieves both ease of use and peelability of the wound sheet.

Figure 1 is a front view showing one embodiment of the tube container with a wound sheet according to the present invention. Figure 2 is a schematic cross-sectional view of the body of the tube container and the heat-sealed winding sheet in one embodiment of the tube container with a wound sheet according to the present invention. Figure 3 is a schematic cross-sectional view showing the peeling of the wound sheet from the tube container body in one embodiment of the wound sheet tube container of the present invention. Figure 4 is a schematic cross-sectional view showing the peeling of the wound sheet from the tube container body in one embodiment of a tube container with a wound sheet, which differs from the present invention. Figure 5 is an illustrative diagram showing the different types of peeling triggers for the wrapped sheet tube containers of Reference Examples 1 to 6.

《Tube container with wrapped sheet》
The tube container with a wound sheet of the present invention is
A tube container with a winding sheet, comprising a tube container body and a winding sheet,
The wound sheet is a laminate in which a base layer and an easily peelable sealant layer are laminated, and is joined to the body of the tube container in a wound manner 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 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, particularly over 10%, 30%, 50%, 70%, 90%, or approximately 100% of the length in the direction intersecting the winding direction of the winding sheet onto the tube container body, the easily peelable sealant layer at the end of the winding has a thin-walled portion, the thickness of which 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.
It is a tube container with a wound sheet.

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 it is generally a laminate of multiple layers.

Furthermore, in this 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.

In one embodiment, as shown in Figure 1, a front view illustrating one aspect of the tube container with a wound sheet according to 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.

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.

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 even when the body portion 20 is squeezed, meaning that the user experience is good. Furthermore, when removing the wound sheet 10, it can be easily peeled off from the tube container by interfacial peeling of the easily peelable sealant layer 2.

The tube container with a wound sheet of the present invention (hereinafter also simply referred to as "the tube container of the present invention") provides the tube container body with the effect of a base layer of the wound sheet, because the wound sheet is joined to the tube container body in a wound manner.

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.

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 to the body of the tube container in a wound manner via the easily peelable sealant layer.

(1) Improving 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. As such a barrier layer, for example, aluminum foil or PET film with a vapor-deposited film can be used.

(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 hologram vapor deposition, can be used.

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, when paper is used in the base layer of the winding sheet, if the tube container body is made to the minimum necessary thickness, a paper tube can be constructed that can be handled as paper waste without separation.

(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 is 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 wound sheet on which the print has been applied.

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

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

(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.

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.

(5) Improved Separability of Tube Containers Conventionally, tube containers with a winding sheet, in which 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.

(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.

(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 by peeling off the wound sheet (making it possible to make it thin and easy to squeeze out at the end).

(8) Provision of additional information such as advertisements and instructions 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.

(9) Inscription of product campaign information or "lottery" on the winding sheet In the tube container of the present invention, by inscribing product campaign information or "lottery" on the winding sheet, the winding sheet can be peeled off and the user can easily apply.

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. In at least a portion of this overlapping portion, the easily peelable sealant layer at the end of the winding has a thin-walled section. The thickness of this thin-walled section 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, thus enabling smooth removal of the winding sheet.

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. The thickness of this thin-walled portion "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)).

Therefore, by pinching the end of the winding (10b) and lifting it 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)).

In this tube container of the present invention, at least a portion of the overlapping section has a thin-walled section of thickness "B" in the easily peelable sealant layer at the end of the winding. Therefore, the easily peelable sealant layer ruptures at this thin-walled section (sometimes referred to as "edge breakage"), allowing the peeling interface to easily transition from the interface between the easily peelable sealant layer (2b) at the end of the winding (10b) and the base layer (1a) at the beginning 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 3(b) and (c)). This enables smooth removal of the wound sheet.

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 beginning 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.

The following describes the various components of the tube container with a wound sheet according to the present invention.

<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.

(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.

Furthermore, the "base layer" may be a layer that provides the wound sheet of this invention with appropriate handling properties, strength, durability, etc., offers 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.

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. Furthermore, 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.

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.

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

More specifically, examples of films used in the base layer include polyethylene film, polypropylene film, polyester film, and especially polypropylene films such as biaxially oriented polypropylene film, or polyester films such as biaxially oriented polyethylene terephthalate film.

Furthermore, the paper used in the base layer is not limited to general paper made from plant fibers such as pulp; it 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.

In addition to the film layer and paper layer, the base layer may further include other layers for the purpose of providing additional functionality. Examples of these 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.

The base layer may have printed text, symbols, marks, etc., on the surface of one or more layers constituting the base layer. Furthermore, the base layer may 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. In particular, a decorative layer that adds (decorates) the appearance, such as patterns, colors, and gloss. However, in relation to the present invention, a layer printed only with text, symbols, marks, etc., and without adding patterns, colors, gloss, or other decorative elements, does not qualify as a "decorative layer."

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

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.

(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.

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 it is heat-sealed to the body of the tube container. In this 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.

In this invention, the thickness of the easily peelable sealant layer is not particularly limited and can be selected considering factors such as usability when using a tube container (squeeze durability) and ease of peeling when removing the wound sheet. 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.

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).

Furthermore, in this 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 this invention, when the winding sheet is peeled off from the tube container body, the easily peelable sealant layer remains on the tube container side.

In this invention, when 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 this 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.

In this 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".

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 the cyclic olefin copolymer to the total of the 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.

Here, polyolefin resins, more specifically, include, but are not limited to, ethylene-based 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; polypropylene-based resins such as homopolypropylene resin, propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer; and polybutene. Furthermore, these materials may be composed individually or as blends with these as the main raw materials.

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.

When a cyclic olefin copolymer is a random copolymer (COC) of cyclic olefins obtained by addition polymerization, the cyclic olefin used as the monomer is not particularly limited. 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.

Furthermore, while not particularly limited, vinyl compounds other than cyclic olefins that can serve as comonomers for cyclic olefin random copolymers (COCs) include, for example, 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.

When using a cyclic olefin-based random copolymer (COC) 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%.

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.

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.

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 becomes a carbon-carbon single bond (C-C). 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 acceptable.

When using cyclic olefin ring-opening polymers or their hydrogenated products (COPs), it is preferable that the proportion of structural units derived from compounds having double bonds in the fused ring skeleton is 80% by mass or more, considering that they will be subjected to hydrogenation reactions.

(Method of manufacturing a wound sheet)
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.

(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.

The winding sheet can be more easily peeled off the tube container body by having a peel-off trigger. In particular, when the tube container body contains a metal surface material, it is preferable that the winding sheet has a peel-off trigger.

In this 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 used as the peeling trigger.

Furthermore, from the viewpoint of improving the ease of peeling 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 two ends of this wound sheet may be (i) spaced apart, (ii) tightly connected, or (iii) overlapped. For example, if the easily peelable sealant layer has an easily peelable sealant layer that undergoes cohesive failure within the layer when peeled, the joint may be of any of the above types (i) to (iii). Also, if the easily peelable sealant layer has an easily peelable sealant layer that undergoes interfacial peeling when peeled, it is preferable that the joint be of type (i) or (ii).

(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.

Furthermore, the winding sheet can have an indication that it can be peeled off the tube container body at the overlapping portion by pressing the winding start portion near the overlapping portion and deforming the body of the tube container body.

Such markings can be applied by printing on one or more layers constituting the base material. The form of the marking may consist solely of text, solely of symbols or marks, or a combination thereof.

<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.

Therefore, the tube container body has a body portion and a spout portion. Furthermore, depending on the design and practicality, a shoulder portion may be further included 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.

In this 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 forming the tube container body may include layers made of resin material and layers made of metal material. If there are multiple layers forming the tube container body, each layer may contain the same material or different materials.

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.

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 easily peelable sealant layer of the wound sheet to the body of the tube container body, thereby heat-sealing the wound sheet to the body of the tube container body in a wound manner.

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.

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

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).

<Wrap-around sheet 1>
PET layer (12 μm) // AL layer (9 μm) // PET layer (12 μm) // Easy-peel sealant layer (15 μm)
<Wrap-around 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) / easily peelable sealant layer laminate (65 μm)

The 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 breakdown)
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).

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)

The 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

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

A rolled sheet with an easily peelable sealant layer or an easily peelable sealant layer laminate was heat-sealed to the surface of the outermost PET layer of the rolled sheet using a hot roll under the following conditions: upper roll temperature 180°C, lower roll temperature 60°C, rotation speed 1 m/min, and pressure 0.2 MPa, forming an overlapping section with a thin wall. Subsequently, the heat-sealed sample was cut into 15 mm widths, 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.

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

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

<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 of the five samples.

As is clear from Table 1, when the thickness of the thin-walled portion of the easily peelable sealant layer was thinner than the thickness of the other portions of the layer, particularly when the thickness of the thin-walled portion of the easily peelable sealant layer was 50% or less of the thickness of the other portions of the layer, the fracture resistance (edge breakage resistance) of the easily peelable sealant layer was good.

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

As laminates for winding sheets in Reference Examples 1 to 6, laminates having 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) / easy-peel sealant layer (intralayer cohesive failure type easy-peel sealant layer) (20 μm)

Furthermore, the easily peelable sealant layers in these Reference Examples 1-6, i.e., the easily peelable sealant layers that undergo cohesive failure within the layer when the wound sheet is peeled off, are polyethylene easy-peel sealants (7601EB manufactured by Toray Film Processing Co., Ltd.).

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

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)

The details of the abbreviations for each layer structure described above are as follows:
PETSiOx: PET layer with silicon oxide vapor deposition 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

<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, 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 heat-seal the tube container, thereby producing the winding sheet-attached tube containers of Reference Examples 1 to 6.

In Reference Examples 1-4 and 6, peel-off triggers (unwelded areas) were provided on the wound sheet. The locations of these peel-off triggers are shown in Figures 5(a) to 5(d). Furthermore, the configuration of Reference Example 5 is shown in Figure 5(e).

Reference Comparison 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 shown in Reference Comparative Example 1.

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

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

As is clear from Table 2, all of the tube containers with wound sheets in Reference Examples 1 to 6 were found to have their wound 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 wound sheets could be easily peeled off by using wound sheets with peel-off triggers.

《Reference example 7》
As a laminate for the wound sheet in Reference Example 7, a laminate having the following layer configuration was prepared (note that "//" indicates bonding by dry laminating adhesive):
Paper (80 g/ ^m² ) // PET (12 μm) / Interfacial peel-type easily removable sealant layer (20 μm) / PE layer (sealant layer) (30 μm)

Note that 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 the 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" layer is removed.

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). Petrocene 226 (manufactured by Tosoh Corporation) was used as the LDPE (low-density polyethylene), and Apel 6013B (manufactured by Mitsui Chemicals, Inc.) was used as the COC (cyclic olefin random copolymer produced by addition polymerization).

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

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

Comparative evaluation of Reference 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.

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.

<Visibility of contents>
The visibility of the contents of the tube container body after the winding sheet was removed was evaluated by calculating the haze value according to JIS K 7361-1997. A smaller haze value indicates higher transparency, i.e., higher visibility of the contents of the tube container body. 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%.

<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 contents were easy to squeeze out because it had good grip on the hand;
B: The slipperiness to the hand when squeezing was slightly inferior to "A," and there was a feeling of resistance when squeezing out the contents.

As is clear from Table 3, from the viewpoint of visibility of the contents, Reference Example 7, which uses an interfacial peel-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: the contents filled in the tube container can be squeezed out while being confirmed.

Furthermore, from the perspective of ease of squeezing, Reference Example 6, which uses an easily peelable resin with intralayer cohesive breakdown, was found to be superior to Reference Example 7, which uses an easily peelable resin with interfacial peeling, resulting in the additional effect of making it easier to squeeze out the contents filled in the tube container.

1 Base layer 1a Starting point of base layer winding 1b Ending point of base layer winding 2 Easy-peel sealant layer 2a Starting point of easy-peel sealant layer winding 2b Ending point of easy-peel sealant layer winding 10 Winding sheet 10a Starting point of winding sheet winding 10b Ending point of winding sheet winding 20 Body of tube container 30 Shoulder of tube container 40 Outlet of tube container 50 Tube container body 100 Tube container with winding sheet

Claims (6)

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 overlap to form an overlapping portion, and in at least a part of the overlapping portion, the easily peelable sealant layer of the ending 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 of the portion of the winding sheet that is joined to the tube container body, and in the overlapping portion, the base material layer of the starting portion of the winding sheet to the tube container body and the easily peelable sealant layer of the ending portion of the winding sheet to the tube container body are joined, and as a result when the ending portion of 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 of the ending portion and the base material layer of the starting portion to the interface between the easily peelable sealant layer of the ending portion and the base material layer of the ending portion.
Tube container with a wound sheet. 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. 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. 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. 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. 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.