JP7540141B2 - Tube container - Google Patents

Description

The present invention relates to a tube container.

Conventionally, a tube container has been known in which a laminated film is molded into a cylindrical shape to form a body, a molded head having a shoulder and a mouth is joined to one end of the cylindrical body, and the other end of the cylindrical body is sealed (see, for example, Patent Documents 1 and 2).

Patent No. 6167803 Patent No. 6138423

In the conventional tube containers described in Patent Documents 1 and 2, one end of the body and the head are joined, and the other end of the body is sealed, by strong fusion joining using heat sealing or the like.
For this reason, it is difficult to dismantle the tube container after use, and it is difficult to reduce the volume of the tube container. In addition, from the viewpoint of container recycling, separation is difficult, and furthermore, since it is difficult to dismantle, it is impossible to clean the inside of the tube container.
An object of the present invention is to provide a tube container which can be easily disassembled and is suitable for reducing the volume, cleaning the inside, and recycling the container.

The present invention solves the problems by the following means. Note that, for ease of understanding, the following description will be given with reference symbols corresponding to the embodiments of the present invention, but the present invention is not limited to these. Furthermore, the configurations described with reference symbols may be modified as appropriate, and at least a portion of the configurations may be replaced with other components.

The first invention is a tube container comprising a cylindrical body (2) made of a laminated film (10), a head (3) joined to one end of the body and having a mouth (31) and a shoulder (32), and a portion to be sealed (4) at the other end of the body to be sealed after the contents are placed therein, the body being joined such that an outermost layer (10b) and an innermost layer (10c) of both side edge portions (10a) of the laminated film are overlapped with each other via an adhesive member (13), the adhesive member having a plurality of concave shapes (13a) evenly formed on both sides thereof, the average diameter of each opening of the concave shapes opening on a first surface is D ^ave ₁ , and the average diameter of each opening of the concave shapes opening on a second surface opposite to the first surface is D ^ave ₂ ,
|D ^ave ₁ −D ^ave ₂ |/D ^ave ₂ ≦0.5
The present invention relates to a tube container that satisfies the above relationship.

The second invention is a tube container according to the first invention, in which the body and the head are joined via the adhesive member.

The third invention is a tube container according to the first or second invention, in which the other end of the body is sealed via the adhesive member.

The fourth invention is a tube container according to any one of the first to third inventions, in which a heat seal layer is not formed on at least one side of the laminated film that constitutes the body.

The fifth invention relates to a tube container according to any one of the first to fourth inventions, in which contents are stored and the other end of the body is sealed.

The present invention provides a tube container that can be easily disassembled and is suitable for reducing the volume, cleaning the inside, and recycling the container.

FIG. 1 is a plan view showing a tube container 1 of a first embodiment. FIG. 2 is an exploded perspective view of the tube container 1 according to the first embodiment. 1A is a cross-sectional view taken along line s1-s1 in Fig. 1. FIG. 1B is a cross-sectional view taken along line s2-s2 in Fig. 1. FIG. 1C is a cross-sectional view taken along line s3-s3 in Fig. 1. FIG. 4 is an enlarged view of a region a shown in FIG. 1A is a partial cross-sectional view showing the layer structure of a first type of laminate film 10. FIG. 1B is a partial cross-sectional view showing the layer structure of a second type of laminate film 10. 1A to 1C are diagrams illustrating the configuration of adhesive sheet 15 when in use. FIG. 2 is a diagram showing a manufacturing device for the adhesive sheet 15. 3A to 3C are diagrams illustrating a method for manufacturing the adhesive sheet 15. 1 is an enlarged photograph of the adhesive member 13 of the adhesive sheet 15 of the example, viewed from the adherend side. 2 is an enlarged cross-sectional view of the adhesive sheet 15 of the embodiment taken in a direction perpendicular to the sheet surface of the adhesive member 13. FIG. FIG. 2 is a diagram showing the peeling forces of the examples and comparative examples. 1A and 1B are diagrams showing the observation results of sample 1. 13A and 13B are diagrams showing the observation results of sample 2. 13A and 13B are diagrams showing the observation results of sample 3. 13A and 13B are diagrams showing the observation results of Sample 4. 1A to 1C are diagrams showing a procedure for dismantling the tube container 1 of the first embodiment. FIG. 11 is a plan view showing a tube container 1A of a second embodiment. FIG. 11 is an exploded perspective view of a tube container 1A according to a second embodiment. 13A to 13C are diagrams showing a procedure for dismantling a tube container 1A of a second embodiment. 13A and 13B are perspective views showing a divided structure of the body portion 2 in a modified embodiment.

Hereinafter, an embodiment of the present disclosure will be described. Note that all drawings attached to this specification are schematic diagrams, and the shape, scale, aspect ratio, and the like of each part are modified or exaggerated from the actual product in consideration of ease of understanding, etc. In addition, hatching showing the cross section of a member is omitted as appropriate in the drawings.
In this specification and the like, terms specifying shapes, geometric conditions, and the degree thereof, such as "orthogonal" and "direction", include not only the strict meaning of the terms, but also the range in which the terms can be regarded as being nearly orthogonal, or the range in which the terms can be regarded as being roughly in that direction.
In the drawings, a coordinate system of mutually orthogonal X and Y axes is appropriately depicted. In this coordinate system, the longitudinal direction of the tube container 1 is defined as the X direction, and the transverse direction perpendicular to the longitudinal direction is defined as the Y direction.

First Embodiment
Fig. 1 is a plan view showing a tube container 1 according to a first embodiment. Fig. 2 is an exploded perspective view of the tube container 1 according to the first embodiment. Fig. 2 shows a state in which the end of the body part 2 on the X1 side is not joined.
Fig. 3(A) is a cross-sectional view taken along line s1-s1 in Fig. 1. Fig. 3(B) is a cross-sectional view taken along line s2-s2 in Fig. 1. Fig. 3(C) is a cross-sectional view taken along line s3-s3 in Fig. 1. In Figs. 3(A) to (C), the cross section of the adhesive member 13 is indicated by a thick black line.
FIG. 4 is an enlarged view of the region a shown in FIG.

As shown in Fig. 1, the tube container 1 of the first embodiment includes a body portion 2, a head portion 3, and a portion to be sealed 4. The tube container 1 of the first embodiment includes the above-mentioned portions, and is configured as a laminated tube-type container.
The body 2 is a portion in which contents (not shown) are accommodated. A head 3 (described later) is joined to the end of the body 2 on the X2 side. A sealing portion 4 (described later) is formed at the end of the body 2 on the X1 side. As shown in FIG. 2, the body 2 is joined so that the side edge portions 10a of the laminated film 10 rolled into a cylindrical shape overlap each other via an adhesive member 13. Hereinafter, the portion in the body 2 where the side edge portions 10a of the laminated film 10 are joined is also referred to as a "joining region C1". The body 2 is formed from the cylindrical shape shown in FIG. 2 to a flattened sealing portion 4 at the end on the X1 side. As a result, the tube container 1 has a substantially elliptical cross-sectional shape at the middle portion in the longitudinal direction (X direction) as shown in FIG. 3(A).

4, in the body portion 2, the outermost layer 10b and the innermost layer 10c of both side edge portions 10a of the laminated film 10 are joined via an adhesive member 13. As described later, the adhesive member 13 is a sheet-like member having adhesive properties on both sides.
1, the adhesive member 13 attached to the joining region C1 of the body 2 extends along the longitudinal direction (X direction) of the body 2. The width (length in the Y direction) of the joining region C1 of the body 2 is set, for example, depending on the weight of the contents contained in the tube container 1, the outer diameter of the body 2, etc. (The same applies to joining regions C2 to C4 described later.) The layer structure of the laminated film 10 forming the body 2 and the structure, manufacturing method, function, etc. of the adhesive member 13 will be described later.

The head 3 is a portion from which the contents contained in the body 2 are poured out. As shown in FIG. 2, the X2 side of the head 3 is provided with a mouth 31 and a shoulder 32. The mouth 31 is a portion that serves as an outlet for pouring out the contents. For example, a cap (not shown) is attached to the mouth 31 in a detachable manner. The shoulder 32 is a substantially conical portion that communicates with the mouth 31. As shown in FIG. 2, in the tube container 1, the outer peripheral surface 3a on the X1 side of the head 3 (shoulder 32) and the inner peripheral surface 2a of the end of the X2 side of the body 2 are joined via an adhesive member 13. Hereinafter, the portion where the head 3 and the body 2 are joined is also referred to as the "joint region C2". As shown in FIG. 1 and FIG. 3(B), in the tube container 1, the joint region C2 between the head 3 and the body 2 overlaps with a part of the joint region C1 of the body 2. As shown in FIG. 2, in a state where the head 3 and the body 2 are joined, the end of the tube container 1 on the X1 side becomes an open end.
The head 3 can be produced, for example, by injection molding one or more thermoplastic resins. In order to ensure gas barrier properties, the head 3 can also be produced by compression molding, injection molding, or the like of a thermoplastic resin member and a gas barrier member.

The portion to be sealed 4 is a portion where the end on the X1 side of the body 2 is sealed after the contents are accommodated. As shown in Fig. 3(C), the end on the X1 side of the body 2 is joined so that their inner circumferential surfaces overlap each other via an adhesive member 13. Hereinafter, the portion of the portion to be sealed 4 where the end on the X1 side of the body 2 is joined is also referred to as the "joining region C3".
The body 2 to which the head 3 is joined is rolled into a cylindrical shape and joined, and then the contents are placed in the end (open end) on the X1 side of the body 2, and a sealing portion 4 is formed at the end on the X1 side of the body 2, thereby obtaining a tube container 1 containing the contents. The contents to be placed in the tube container 1 depend on the adhesive strength of the adhesive member 13, but are preferably relatively light and non-liquid.

Next, the layer structure of the laminated film 10 will be described by giving two examples: an example of a layer structure formed by dry lamination and an example of a layer structure formed by extrusion lamination.
FIG. 5A is a partial cross-sectional view showing the layer structure of a first embodiment of the laminate film 10. As shown in FIG.
5(A) is formed by laminating, in order from the innermost layer, a heat sealable film 101, an adhesive layer 102, a barrier layer 103, an adhesive layer 104, a printed layer 105, and a base film 106. This embodiment is an example of a laminated structure by a dry lamination method using an adhesive layer, in which the heat sealable film 101 and the barrier layer 103 are laminated with the adhesive layer 102 interposed therebetween, and further, the printed layer 105/base film 106 are laminated with the adhesive layer 104 interposed therebetween.

The heat sealable film 101 is the innermost layer of the laminated film 10. The heat sealable film 101 may be any film that can be melted and fused together by heat, and may be, for example, a low density polyethylene film (LDPE), a medium density polyethylene film (MDPE), a high density polyethylene film (HDPE), a linear low density polyethylene film (LLDPE), a polypropylene film, an acid-modified polyolefin resin film in which a polyolefin resin such as polyethylene or polypropylene is modified with acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, or other unsaturated carboxylic acid, a polyvinyl acetate resin film, a polyester resin film, a polystyrene resin film, polyacrylonitrile, saturated polyester, polyvinyl alcohol, or other resin film or films made of one or more of these.

The adhesive layer 102 is a layer that bonds the heat sealable film 101 and the barrier layer 103 (described later). The resin that constitutes the adhesive layer 102 can be appropriately selected depending on the resin that constitutes the film to be bonded. For example, any of anchor coating agents such as isocyanate (urethane), polyethyleneimine, polybutadiene, and organic titanium, or polyurethane, polyacrylic, polyester, epoxy, polyvinyl acetate, cellulose, and other laminating adhesives can be used.
Similarly, the adhesive layer 104 is a layer that adheres between the barrier layer 103 and the printed layer 105/substrate film 106. The adhesive layer 104 and the adhesive layer 102 may be made of the same material or different materials.

The barrier layer 103 is a layer that imparts gas barrier properties to the laminated film 10. Examples of materials that can be used to form the barrier layer 103 include gas barrier materials against oxygen gas and water vapor, light-shielding materials against sunlight, and materials that have aroma retention properties for the contents. Specifically, examples of the barrier materials that can be used include aluminum foil, tin, lead, copper, iron, nickel, or alloys thereof, or resin films or sheets having a thin metal deposition film of aluminum or the like, and further, resin films or sheets having a thin metal deposition film of alumina, silica, titanium oxide, or the like, which are oxides of these metals.

The aluminum foil may be an aluminum foil having a thickness of about 5 μm to 30 μm. In addition, a resin film or sheet having a vapor-deposited thin film of a metal or metal oxide may be a resin film or sheet having a vapor-deposited thin film of a metal such as aluminum formed on the resin film using a physical vapor deposition method (PVD method) such as vacuum deposition, sputtering, ion plating, or cluster ion beam method.

The printed layer 105 is a layer that imparts a design to the laminated film 10. As colorants used in the printed layer 105, for example, various pigments such as red, brown, yellow, indigo, grass green, white, and black pigments, metallic pigments, pearl pigments, polarized pearl pigments, and fluorescent pigments can be used. Among them, as pearl pigments, single-color pearls such as gold and silver, mica, silica, etc. can be used.

The base film 106 is the outermost layer of the laminated film 10. As a material for the base film 106, for example, it is desirable to use a resin film or sheet that has excellent mechanical, physical, chemical, and other properties as the basic material for the tube container 1, and is particularly strong and tough, and has heat resistance, moisture resistance, transparency, and the like. Specifically, for example, polyester resin, polyamide resin, polyaramid resin, polyolefin resin, polycarbonate resin, polyacetal resin, fluorine resin, other tough resin films or sheets, and others can be used. As the above-mentioned resin film or sheet, either an unstretched film or a stretched film stretched in a uniaxial or biaxial direction can be used.

In laminated films used in general tube containers, a heat sealable film is also laminated on the outermost layer. For example, in the case of the first type of laminated film 10 shown in FIG. 5(A), a heat sealable film is laminated on the outer side of the base film 106 via an adhesive layer. However, in the tube container 1 of this embodiment, as shown in FIG. 4, the outermost layer 10b and the innermost layer 10c of both side edge portions 10a of the laminated film 10 are joined with an adhesive member 13, so that the heat sealable film can be omitted on the side that becomes the outermost layer 10b. In the first type of laminated film 10 shown in FIG. 5(A), if a transparent heat sealable film is laminated on the outermost layer via an adhesive layer, the heat sealable film 101 and adhesive layer 102 of the innermost layer can be omitted.

Next, a second type of layer structure of the laminated film 10 will be described with reference to FIG.
FIG. 5B is a partial cross-sectional view showing the layer structure of the laminated film 10 in a second embodiment.
The laminated film 10 shown in FIG. 5(B) is laminated with a heat sealable film 201, an adhesive resin layer 202, a barrier layer 203, an adhesive resin layer 204, a printed layer 205, and a base film 206 in order from the innermost layer. This embodiment is an example of a laminated structure by an extrusion lamination method using an adhesive resin layer, in which the heat sealable film 201 and the barrier layer 203 are laminated with an adhesive resin layer 202 formed by extruding a molten resin such as polyethylene interposed therebetween, and the printed layer 205/base film 206 is also laminated with an adhesive resin layer 204 interposed therebetween. Here, the configurations of the heat sealable film 201, the barrier layer 203, and the base film 206 are substantially the same as those of the heat sealable film 101, the barrier layer 103, and the base film 106 in the first embodiment, and therefore the description thereof will be omitted. In addition, in this second embodiment, as in the first embodiment, no heat sealable film is provided in the outermost layer. In addition, in the laminate film 10 shown in Figure 5 (B), an anchor coat layer may be laminated between any of the layers between the adhesive resin layer 202 and the barrier layer 203, and between the adhesive resin layer 204 and the printing layer 205.

Next, the configuration, manufacturing method, function, etc. of the adhesive member 13 attached to each part of the tube container 1 will be described.
6A to 6C are diagrams illustrating the configuration of the adhesive sheet 15 when in use.
As shown in FIG. 6(A), the adhesive sheet 15 includes a first releasable base sheet 11, an adhesive member 13, and a second releasable base sheet 14.

The first peelable base sheet 11 is a sheet material (surface sheet) laminated on one side of the adhesive member 13. The first peelable base sheet 11 (and the second peelable base sheet 14) are provided in consideration of the ease of handling until the adhesive sheet 15 is used, and are peeled off when the adhesive sheet 15 is used, i.e., when the body 2, the head 3, etc. are joined. As the first peelable base sheet 11, various forms such as conventionally known release films, separation papers, separation films, separation papers, release films, release papers, etc. can be appropriately used. For example, high-quality paper, coated paper, impregnated paper, plastic films, etc., having a release layer formed on one or both sides may be used. The release layer is not particularly limited as long as it is a material having releasability, but examples thereof include silicone resins, organic resin-modified silicone resins, fluororesins, aminoalkyd resins, melamine-based resins, acrylic resins, polyester resins, etc. These resins can be any of emulsion type, solvent type, and solventless type. When using a release film with a release layer, for example, silicone release type PET (polyethylene terephthalate) film, untreated PET film, PP film, silicone release type paper, etc. can be used.

The thickness of the first peelable substrate sheet 11 is, for example, preferably 10 μm or more and 100 μm or less, and more preferably 20 μm or more and 60 μm or less. If the thickness is below the lower limit of the layer thickness range, the sheet will lose stiffness and will be difficult to peel off. If the thickness is above the upper limit of the layer thickness range, the sheet will be too stiff, which will reduce workability during application.
In addition, a commercially available product may be used as the first releasable base sheet 11, for example, a 38 μm thick polyester film (manufactured by Mitsui Chemicals Tocello Inc., product name: SP-PET-01) having one side treated for easy peeling with a silicone-based release agent.
The second releasable base sheet 14 is a sheet material (surface sheet) laminated on the other side of the adhesive member 13. The material, thickness, etc. of the second releasable base sheet 14 are the same as those of the first releasable base sheet 11, and therefore description thereof will be omitted.

The adhesive member 13 has a plurality of recessed shapes 13a that are open on both sides thereof. The adhesive member 13 has elasticity, and each of the plurality of recessed shapes 13a acts as a minute suction cup to exert adhesive force (adsorption force).
The adhesive member 13 can be formed by a manufacturing method described later using, for example, a liquid resin composition (acrylic emulsion) disclosed in Patent Document 1 (JP Patent Publication 2017-36404). The layer thickness of the adhesive sheet 15 is preferably 1 μm or more and 500 μm or less. If the layer thickness falls below the lower limit of the above layer thickness range, it becomes difficult to form a concave shape, or the size of the concave shape becomes too small, resulting in a decrease in adhesive (adsorption) characteristics. In addition, if the layer thickness exceeds the upper limit of the above layer thickness range, flexibility decreases, and workability when joining each part of the tube container 1 becomes poor. In order to provide the concave shape 13a evenly on both sides of the adhesive member 13, it is desirable that the layer thickness t of the adhesive member 13 is in the range of 20 μm≦t≦40 μm. This point will be described later.

To attach the adhesive member 13 to the body 2, head 3, etc. (hereinafter also referred to as "adherend 50") using the adhesive sheet 15 shown in FIG. 6(A), the second releasable substrate sheet 14 is peeled off from the adhesive sheet 15 as shown in FIG. 6(B). Then, as shown in FIG. 6(C), the exposed adhesive member 13 is attached to the adherend 50 and an appropriate pressure is applied to the surface. This causes the numerous concave shapes 13a present on the exposed surface of the adhesive member 13 to elastically deform, so that the adhesive member 13 is adsorbed (adhered) to the adherend 50 by the same action as a conventional micro suction cup.

That is, due to the elastic deformation around the concave shape 13a, a force acts on the concave shape 13a to return it to its original shape from the deformed state. This force creates a negative pressure in the enclosed space inside the concave shape 13a, causing it to adhere to the adherend 50. Although the adhesive force of each concave shape 13a is weak, since many concave shapes 13a are formed, the necessary adhesive force can be secured overall. Furthermore, when the adhesive member 13 is produced, the amount of concave shapes 13a contained can be adjusted, for example, by adjusting the density as a parameter, thereby adjusting the adhesive force (adhesive force) of the adhesive member 13.

After the adhesive sheet 15 is attached to the adherend 50, the first releasable substrate sheet 11 is further peeled off from the adhesive sheet 15. This allows the exposed adhesive member 13 to be attached to another adherend 50 (not shown). For example, as shown in Fig. 4, when the outermost layer 10b and the innermost layer 10c on both side edges of the laminated film 10 are joined via the adhesive member 13, the adherends 50 attached to one and the other sides of the adhesive member 13 are the laminated films 10, respectively.
The layer structure of the laminated film 10 is not limited to the examples of the first and second embodiments described above, and may be any layer structure as long as it can be used as a tube container 1.

Next, a method for producing the adhesive sheet 15 will be described.
FIG. 7 is a diagram showing a manufacturing apparatus for the adhesive sheet 15. As shown in FIG.
FIG. 8 is a diagram illustrating a method for manufacturing the adhesive sheet 15. As shown in FIG.
To manufacture the adhesive sheet 15, first, the acrylic emulsion composition disclosed in Patent Document 1 for forming the adhesive member 13 is placed in a stirrer, and the composition is stirred while nitrogen gas is mixed into it, thereby incorporating air bubbles into the composition and producing a bubble-containing composition 130 (P1 in the figure: whipping process).
Next, the bubble-containing composition 130 is applied onto the second release substrate sheet 14 (P2 in the figure: coating step). In the coating step, for example, a comma coater can be used, but other known coating techniques may also be used.

After the air bubble-containing composition 130 is applied onto the second release substrate sheet 14, the air bubble-containing composition 130 is dried while being heated to form the adhesive member 13 (P3 in the figure: drying step). In the drying step, for example, a drying oven with a temperature of about 60°C to 140°C can be used. The drying time can be, for example, about 30 seconds to 10 minutes. In the drying step, air may be blown onto the air bubble-containing composition 130 to promote drying. By carrying out the drying step, a concave shape 13a is formed on both sides of the air bubble-containing composition 130, and the adhesive member 13 is formed. This concave shape 13a is formed when the air bubbles contained in the air bubble-containing composition 130 break and part of the shape of the air bubbles remains. Here, if the air bubbles break when the air bubble-containing composition 130 is not cured sufficiently, the concave shape 13a is unlikely to remain. On the other hand, if the air bubble-containing composition 130 hardens before the air bubbles break, the concave shape 13a may not be formed. Therefore, it is desirable to carry out the drying process under conditions that break the bubbles when the bubble-containing composition 130 has hardened to a certain extent. Therefore, the temperature and airflow rate during the drying process have a significant effect on the state of the recessed shape 13a.

After forming the adhesive member 13 by the drying process, the first peelable base sheet 11 prepared separately is bonded to the adhesive member 13 (P4 in the figure: lamination process). In this lamination process, lamination is performed by the suction force (adhesive force) of the concave shape 13a of the adhesive member 13, so heating is not required and bonding is possible with only a slight pressure force. Therefore, the first peelable base sheet 11, which is the surface sheet, is not damaged.
When the lamination process is completed, the adhesive sheet 15 is completed.
As described above, in the manufacturing method of the adhesive sheet 15 of the present embodiment, the adhesive sheet 15 can be manufactured efficiently without being damaged by heat when forming the adhesive member 13. The adhesive sheet 15 may then be wound into a roll or cut to a required size.

Next, an example of actually producing the adhesive sheet 15 of this embodiment will be shown, and the results will be compared with a comparative example.
In the pressure-sensitive adhesive sheet 15 of the embodiment, the bubble-containing composition 130 that had been subjected to the foaming process was applied to a biaxially stretched PET film with releasability on the second peelable substrate sheet 14 using a comma coater with a clearance of 200 μm. This was dried for 1 minute in a drying path at 100° C. to form the pressure-sensitive adhesive member 13, and the surface sheet was laminated to obtain the pressure-sensitive adhesive sheet 15. The density of the pressure-sensitive adhesive member 13 in this case was 0.39 g/cm ³ and the thickness was 50 μm.
FIG. 9 is an enlarged photograph of the adhesive member 13 of the adhesive sheet 15 of the example, viewed from the adherend side.
FIG. 10 is an enlarged cross-sectional view of the adhesive sheet 15 of the embodiment taken along a direction perpendicular to the sheet surface of the adhesive member 13. As shown in FIG.
As shown in FIGS. 9 and 10, it can be seen that a large number of recesses 13a are formed in the adhesive member 13.

As Comparative Example 1, a pressure-sensitive adhesive sheet was produced in the same manner as in the above-mentioned Examples, except that the foaming step was not performed. The density of the pressure-sensitive adhesive member after production was 0.87 g/ ^cm3 , and the thickness was 100 μm.
As Comparative Example 2, an adhesive sheet (referred to as acrylic adhesive type A) was prepared in which an adhesive member was produced using SK2094 manufactured by Soken Chemical & Engineering Co., Ltd., which is an acrylic resin.
As Comparative Example 3, an adhesive sheet (referred to as acrylic adhesive type B) was prepared in which an adhesive member was produced using SK1502C manufactured by Soken Chemical & Engineering Co., Ltd., which is an acrylic resin.

The above four types of pressure-sensitive adhesive sheets were prepared and compared in terms of peel strength.
FIG. 11 is a diagram showing the peeling forces of the examples and the comparative examples.
The peel strength in Fig. 11 was measured using a tensile tester at a pulling speed of 300 mm/min and a 180° peel. The peel strength was measured immediately after application (0 hours) and 1000 hours after application.

In the examples, it can be seen that the adhesive can be peeled off with a relatively small peeling force both immediately after application and after 1000 hours have passed. With this level of peeling force, the tube container will not peel off naturally while the contents are still contained therein, and can be easily peeled off by applying force when attempting to peel it off. Furthermore, since the adhesive is adhered by the concave shape 13a, no adhesive member 13 remains on the surface of the adherend 50 after peeling, and there is no substantial change in the adhesive strength (peeling strength) of the adhesive member 13 itself, making it possible to re-apply the adhesive.

In Comparative Example 1, small pieces could be peeled off with a relatively small peeling force, but large pieces required a certain amount of force to peel off. In addition, after peeling, residual adhesive material was found on the surface of the adherend, making complete re-attachment impossible.
In Comparative Example 2, a certain amount of force was required to peel off the large size film, and it was possible to peel it off immediately after application. However, after 1000 hours, the peel force had increased significantly, making it difficult to peel off by hand, and there was a risk of the surface sheet being damaged if it was forcibly peeled off.
In Comparative Example 3, the peeling force was too strong immediately after application, making it difficult to peel off by hand, and there was a risk of the surface sheet being damaged if it was forcibly peeled off.
In addition, in both Comparative Example 2 and Comparative Example 3, after peeling, some of the adhesive remained on the adherend or the adhesive strength was reduced, making them unsuitable for re-attachment.

(Verification experiment on the concave shape 13a of the adhesive member 13)
As described above, the concave shape 13a of the adhesive member 13 has a large effect on the adhesive strength. If the concave shape 13a is not evenly provided on both sides of the adhesive member 13, there is a risk that the adhesive strength (adsorption strength) of one side of the adhesive member will be lowered or increased compared to the other side. In addition, by providing the concave shape 13a evenly on both sides of the adhesive member 13, the physical properties of the adhesive member 13 become uniform, which is preferable in terms of sufficient adhesive strength to both the laminated films (body part 2) or to both the laminated film (body part 2) and the head part 3, and removability from the adherend.

In order to provide the concave shape 13a evenly on both sides of the adhesive member 13, it is important to manage the coating amount (layer thickness t) of the adhesive member 13. In Patent Document 1 (JP Patent Publication 2017-36404), no consideration is given to this point, and it is sufficient that the micro-suction cups are simply formed. In Patent Document 1, in FIG. 2 (FIG. 2 of Patent Document 1), which is a cross-sectional photograph of Example 1 formed with a wet film thickness of 800 μm, a fine suction cup structure is formed in the part shown as the surface having the micro-suction cups, but a structure that seems to be a huge bubble that is incomparable to the previous fine suction cup structure can be confirmed in the part shown as the surface peeled off from the glass substrate. That is, in the configuration of Patent Document 1, a micro-suction cup (corresponding to the concave shape 13a in this embodiment) is formed on one side of the adhesive member, but the micro-suction cup (concave shape 13a) is hardly formed on the other side.

The present applicant also conducted verification experiments on this point.
As a verification experiment, four types of samples of the adhesive member were prepared, and the concave shapes 13a on both sides of the samples were observed by SEM.
Sample 1: Adhesive layer thickness t=25 μm
Sample 2: Adhesive layer thickness t=30 μm
Sample 3: Adhesive layer thickness t=35 μm
Sample 4: Layer thickness t of adhesive member ≈ 2000 μm
The layer thickness of the above samples is the layer thickness after drying. For samples 1 to 3, the foamed bubble-containing composition was applied to the glass surface using a coater, and then dried in a drying oven at 100 degrees. For sample 4, the composition was applied dropwise to the glass surface, and naturally dried at room temperature. The drying conditions for sample 4 were changed in order to verify the statement in Patent Document 1 that drying at room temperature is sufficient. For all samples, the density of the adhesive member after foaming was 0.4 g/ ^cm3 .

12A and 12B are diagrams showing the observation results of Sample 1.
13A and 13B are diagrams showing the observation results of Sample 2.
14A and 14B are diagrams showing the observation results of Sample 3.
15A and 15B are diagrams showing the observation results of Sample 4.
As shown in Figs. 12 to 14, it was confirmed that for Samples 1 to 3 in which the layer thickness t of the adhesive member was controlled, the fine recesses 13a were formed evenly on both sides.
In contrast, in the thick sample 4 shown in FIG. 15, an extreme difference in size of the concave shapes 13a was observed between the dry surface and the glass side surface, and a result similar to that shown in FIG. 2 of Patent Document 1 was obtained.
Therefore, in order to provide the concave shapes 13a evenly on both sides of the adhesive member 13, it is considered desirable that the layer thickness t of the adhesive member 13 be in the range of 20 μm≦t≦40 μm.

Here, in order to provide the concave shapes 13a evenly on both sides of the adhesive member 13, it is preferable that the following relationship be satisfied.
When the average diameter of each opening of the concave shape 13a opening on the surface on the first release base sheet side is defined as D ^ave ₁ , and the average diameter of each opening of the concave shape 13a opening on the surface on the second release base sheet side is defined as D ^ave ₂ ,
|D ^ave ₁ −D ^ave ₂ |/D ^ave ₂ ≦0.5
It is desirable to satisfy the following relationship.
Also,
|D ^ave ₁ - D ^ave ₂ |/D ^ave ₂ ≦0.25
It is more preferable that the following relationship is satisfied.

By satisfying these relationships, the difference in adhesive strength on both sides of the adhesive member 13 can be reduced, and sufficient adhesive strength to both the laminated films (body portion 2) or to both the laminated film (body portion 2) and head portion 3, as well as good removability from the adherend, can be exhibited.
In addition, since it is practically impossible to obtain the average of all openings, the diameters of the three openings, starting from the largest, were measured within an observation range of 1500 μm × 1100 μm, and the average value was calculated.
Here, the openings of the samples in Figs _{. 12} to 15 were measured, _and | ^Dave1 - ^Dave2 |/ ^Dave2 was calculated to be sample 1: 0.04, sample 2: 0.06, sample 3: 0.12, and sample 4: 0.69.
By using the adhesive member 13 having the above-mentioned configuration, the tube container 1 of the first embodiment is configured to be easily disassembled.

The adherend 50 (see FIG. 6(C)) is characterized by low tackiness on the exposed adhesive surface according to the ball tack test in accordance with JIS Z 0237. The adhesive member of the present invention exerts a suction cup adhesive function due to the presence of numerous concave shapes. Therefore, the adhesive member has a relatively low adhesiveness due to the material, and has a lower tackiness than a normal adhesive member that does not have concave shapes. Therefore, even in a usage mode in which the adhesive surface is exposed on the outermost surface of a packaging bag, it is possible to prevent the adhesive surface from becoming sticky while exerting sufficient adhesiveness when adhering to the surface to be adhered, which provides effective anti-slip properties. Therefore, it is suitable for use in a usage mode in which the adhesive surface is exposed, as in the present invention.

As described above, the adhesiveness of the adhesive member 13 can be adjusted by changing the conditions for forming the openings. By changing the conditions for forming the openings of the adhesive member 13, the following two types of adhesive members 13 (classified as Type A and Type B) can be produced as the way in which the adhesive action is exerted.
Type A: An adhesive member in which adhesive strength is exerted by a suction cup action, and the adhesiveness of the adhesive itself also contributes to the adhesive strength. In this Type A adhesive member, a slight "sticky" feel is generated due to the adhesiveness of the adhesive itself.
Type B: An adhesive member in which the adhesive strength is exerted by the suction cup action, but the adhesiveness of the adhesive itself does not contribute to the adhesive strength or the adhesiveness of the adhesive itself is not exerted. In this adhesive member of Type B, the adhesiveness of the adhesive itself does not act as adhesive strength, so no "sticky" tactile sensation is produced.

An inclined ball tack test (JIS Z 0237), which is an adhesive property test effective for evaluating the above-mentioned "stickiness", was carried out on the above-mentioned two types of adhesive members. The outline of the inclined ball tack test is as follows.
First, the obtained adhesive member was cut into a width of 25 mm and a length of 100 mm to prepare a test specimen. Next, the test specimen was set in a ball tack tester (manufactured by Tester Sangyo Co., Ltd.) so that the adhesive surface was the surface (the inclination angle of the adhesive surface was 30°). Furthermore, in an atmosphere of 23°C, a steel ball was rolled so as to pass through the measurement surface area of the adhesive surface of the test specimen set in the ball tack tester (the length of the measurement surface was 100 mm). At this time, steel balls with diameters ranging from 1/32 inch to 1 inch were used. Then, among the steel balls that stopped within the measurement surface area when these steel balls were rolled, the ball number value of the largest diameter was specified. The ball number was obtained by multiplying the diameter of the steel ball by 32. Each numerical value in the ball tack test below indicates the value of the ball number.

The results of the inclined ball tack test for the adhesive member 13 of this embodiment are shown below.
Type A: 9 (ball No. 9)
Type B: The adhesive itself is not tacky, so all balls of Ball No. 1 and above roll off. In other words, the ball tack rating is less than 1.
Since there are various forms of use as a PSA material, it is not possible to simply rank Type A and Type B in terms of superiority, and it is advisable to select an appropriate type according to the form of use. Regarding Type A, in consideration of the convenience of re-peeling and re-attachment, the ball tack test result is preferably 5 to 10, more preferably 6 to 9, and even more preferably 7 to 8.
In this embodiment, since a “sticky” feel is undesirable, it is preferable to use Type B as the adhesive member 13 .

Next, a procedure for dismantling the tube container 1 of the first embodiment will be described.
16A to 16C are diagrams showing the procedure for dismantling the tube container 1 of the first embodiment.
First, as shown in Fig. 16(A), at the end of the X2 side of the body 2, a force (peeling force) greater than the adhesive force of the adhesive material 13 is applied to both side edges 10a of the body 2 attached to the joining area C1, and the end of the X2 side of the body 2 is opened in the Y1 and Y2 directions and peeled off. As a result, the adhesive members 13 attached to the joining area C1 of the X2 side of the body 2 and the joining area C2 between the head 3 and the body 2 are peeled off, so that the head 3 can be separated from the end of the X2 side of the body 2. Note that Fig. 16(A) shows an example in which the adhesive member 13 remains on the body 2 side when the head 3 is separated from the body 2, but the adhesive member 13 may remain on the head 3 side.

16(B), at the end of the X1 side of the body 2, a force greater than the adhesive force of the adhesive material 13 is applied to both side edges 10a of the body 2 attached to the joining area C3, and the end of the X1 side of the body 2 is opened in the Y1 and Y2 directions and peeled off. This leaves the end of the X1 side of the body 2 in an open state.
Next, the joint region C1 of the body 2 is peeled off from the end on the X2 side or the end on the X1 side toward the opposite side in the Y1 and Y2 directions, respectively, so that the body 2 becomes substantially flat, as shown in FIG.
By carrying out the above-mentioned procedure, the tube container 1 can be disassembled into the head portion 3 and the body portion 2. The procedure for disassembling the tube container 1 may be reversed from that described above.

In the tube container 1 of the first embodiment described above, the overlapping portions of both side edges of the body 2, the overlapping portion of the head 3 and body 2, and the overlapping portion of the end of the body 2 on the X1 side are each joined with an adhesive member 13. The adhesive member 13 joining each portion has an adhesive strength that can be peeled off with a relatively small peeling force, but does not peel off naturally when the tube container 1 contains contents. Therefore, the tube container 1 can maintain its shape as a container when the contents are contained, and can be easily disassembled by applying a small peeling force to each joint portion when disassembling.

In addition, in the tube container 1 of the first embodiment, not only the overlapping portions of both side edges of the body 2, but also the overlapping portions of the head 3 and body 2 and the overlapping portions of the X1 side end of the body 2 are each joined with an adhesive material 13. Therefore, when the tube container 1 is disassembled, the head 3 can be easily separated from the body 2, and the body 2 can be made into a substantially flat plate. Therefore, the tube container 1 of the first embodiment is also suitable for reducing the volume of the tube container, cleaning the inside, and recycling the container.

Second Embodiment
The tube container 1A of the second embodiment differs from the first embodiment in that a bottom 5 is provided on the X1 side of the body 2. The other configurations of the tube container 1A of the second embodiment are substantially the same as those of the first embodiment. Therefore, in the description and drawings of the second embodiment, the same reference numerals as those of the first embodiment are used for the members and the like equivalent to those of the first embodiment, and redundant description will be omitted.
Fig. 17 is a plan view showing a tube container 1A of the second embodiment. Fig. 18 is an exploded perspective view showing the tube container 1A of the second embodiment.

17 and 18, the tube container 1A of the second embodiment includes a body portion 2, a head portion 3, and a bottom portion 5. By including the above-mentioned portions, the tube container 1A of the second embodiment is configured as an elongated bottle-shaped container.
In the tube container 1A of the second embodiment, the configurations of the body 2 and the head 3 are the same as those of the first embodiment, and therefore the description will be omitted. The cross section taken along line s4-s4 shown in Fig. 17 is the same as that shown in Fig. 3(B). The cross section taken along line s5-s5 shown in Fig. 18 is the same as that shown in Fig. 3(A) except that the shape of the body 2 is circular.

The bottom (sealing portion) 5 is a bottomed member that seals the end of the body 2 on the X1 side. In the tube container 1A, the outer peripheral surface 5a of the bottom 5 on the X2 side and the inner peripheral surface 2a of the end of the body 2 on the X1 side are joined via an adhesive member 13. Hereinafter, the part where the bottom 5 and the body 2 are joined is also referred to as the "joint area C4". As shown in FIG. 17, in the tube container 1A, the joint area C4 between the bottom 5 and the body 2 overlaps with a part of the joint area C1 of the body 2. The bottom 5 can be produced, for example, by injection molding one or more thermoplastic resins. In addition, the bottom 5 can also be produced by compression molding, injection molding, etc. of a thermoplastic resin member and a gas barrier member to ensure gas barrier properties.

For example, the tube container 1A is formed by joining the head 3 and the X2 end of the body 2 with an adhesive member 13, and then joining both side edges 10a of the body 2 rolled into a cylindrical shape with the adhesive member 13, so that the head 3 is joined to the cylindrical body 2. In this state, the X1 end of the tube container 1A becomes an open end. After this, the contents are placed in the X1 end (open end) of the body 2, and the X1 end of the body 2 and the bottom 5 are joined with the adhesive member 13 to obtain the tube container 1A containing the contents. Note that the procedure for placing the contents in the tube container 1A may be reversed from that described above.

Next, a procedure for dismantling the tube container 1A of the second embodiment will be described.
19A to 19C are diagrams showing the procedure for dismantling the tube container 1A of the second embodiment. Note that, in dismantling the tube container 1A of the second embodiment, some of the operations overlapping with those of the tube container 1 of the first embodiment will not be described.

When dismantling the tube container 1A of the second embodiment, first, as shown in FIG. 19(A), a force (peeling force) greater than the adhesive force of the adhesive member 13 is applied to both side edges 10a of the body 2 attached to the joining area C1 at the X2 side end of the body 2, and the X2 side end of the body 2 is opened in the Y1 and Y2 directions and peeled off. As a result, the adhesive members 13 attached to the joining area C1 on the X2 side of the body 2 and the joining area C2 between the head 3 and the body 2 are peeled off, so that the head 3 can be separated from the X2 side end of the body 2. Note that FIG. 19(A) shows an example in which the adhesive member 13 remains on the body 2 side when the head 3 is separated from the body 2, but the adhesive member 13 may also remain on the head 3 side.

Next, as shown in FIG. 19(B), at the X1 side end of the body 2, a force greater than the adhesive force of the adhesive material 13 is applied to both side edges 10a of the body 2 attached to the joining area C4, and the X1 side end of the body 2 is opened in the Y1 and Y2 directions and peeled off. As a result, the adhesive material 13 attached to the joining area C1 on the X1 side of the body 2 and the joining area C4 between the bottom 5 and the body 2 are peeled off, so that the bottom 5 can be separated from the X1 side end of the body 2. Note that FIG. 19(B) shows an example in which the adhesive material 13 remains on the body 2 side when the bottom 5 is separated from the body 2, but the adhesive material 13 may also remain on the bottom 5 side.

Next, the joint region C1 of the body 2 is peeled off from the end on the X2 side or the end on the X1 side toward the opposite side so as to open in the Y1 and Y2 directions, respectively. As a result, as shown in FIG. 19C, the body 2 becomes substantially flat.
By carrying out the above-mentioned procedure, the tube container 1A can be disassembled into the head portion 3, the body portion 2, and the bottom portion 5. The procedure for disassembling the tube container 1A may be reversed from that described above.
The tube container 1A of the second embodiment described above can also maintain its shape as a container when the contents are contained therein, and can be easily disassembled by applying a small peeling force to each joint portion when disassembling. Moreover, the tube container 1A of the second embodiment is also suitable for reducing the volume of the tube container, cleaning the inside, and recycling the container.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-mentioned embodiments, and various modifications and variations are possible, such as the modified forms described below, which are also included within the technical scope of the present disclosure. Furthermore, the effects described in the embodiments are merely a list of the most favorable effects resulting from the present disclosure, and are not limited to those described in the embodiments. Note that the above-mentioned embodiments and the modified forms described below can be used in appropriate combinations, but detailed explanations will be omitted.

(Modifications)
In the tube container 1 of the first embodiment, bonding between the head 3 and the body 2 and bonding between the to-be-sealed portion 4 may be performed by adhesive, heat sealing, or the like. In the tube container 1A of the second embodiment, bonding between the head 3 and the body 2 and bonding between the body 2 and the bottom 5 may be performed by adhesive, heat sealing, or the like. That is, in the tube containers 1 and 1A of each embodiment, as long as at least the side edge portions 10a of the laminate film 10 are bonded to each other by the adhesive member 13 in the bonding region C1, the tube containers can be easily disassembled.
The shape of the body 2 is not limited to a cylindrical shape, and may be, for example, a triangular prism shape or a polygonal prism shape having pentagons or more.

20A and 20B are perspective views showing the divided structure of the body portion 2 in a modified embodiment.
20(A), the body 2 may be divided into two parts at equal intervals in the short direction (Y direction), and both side edge portions 10a of each part may be joined with an adhesive member 13. Alternatively, as shown in Fig. 20(B), the body 2 may be divided obliquely in a direction intersecting with the longitudinal direction (X direction), and both side edge portions 10a of each part may be joined with an adhesive member 13.

REFERENCE SIGNS LIST 1, 1A Tube container 2 Body 3 Head 4 To-be-sealed portion 5 Bottom 10 Laminated film 10a Side edge 13 Adhesive member 15 Adhesive sheet 31 Mouth 32 Shoulder C1 to C4 Joint region

Claims (6)

A tube container comprising: a cylindrical body portion made of a laminated film; a head portion joined to one end of the body portion and having a mouth portion and a shoulder portion; and a sealing portion at the other end of the body portion to be sealed after contents are placed therein,
The body portion is formed by bonding the outermost layer and the innermost layer of the laminated film at both side edges thereof so as to overlap each other via an adhesive member made of an acrylic emulsion,
The adhesive member has a plurality of recesses evenly formed on both sides thereof,
The layer thickness t of the adhesive member is in the range of 20 μm≦t≦40 μm,
When the average value of the diameter of each opening of the concave shape opening into the first surface is D ^ave ₁ , and the average value of the diameter of each opening of the concave shape opening into the second surface opposite to the first surface is D ^ave ₂ ,
|D ^ave ₁ - D ^ave ₂ |/D ^ave ₂ ≦ 0.25
Tube container that meets the requirements. The tube container according to claim 1,
The pressure-sensitive adhesive member has a peel strength of 6 N/25 mm or less when peeled at 180° at a pulling speed of 300 mm/min 1000 hours after application. The tube container according to claim 1 or 2,
The body and the head of the tube container are joined together via the adhesive member. In the tube container according to any one of claims 1 to 3,
The other end of the body of the tube container is sealed via the adhesive member. The tube container according to any one of claims 1 to 4,
A tube container in which no heat seal layer is formed on at least one surface of the laminate film constituting the body portion. A tube container according to any one of claims 1 to 5, in which contents are stored and the other end of the body is sealed.

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