JP4331372B2 - Thermal adhesive resin sheet connection structure and connection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection structure and a connection method for a heat-adhesive resin sheet that is employed when, for example, a pouch container or the like formed by a heat-adhesive resin sheet is manufactured.
[0002]
[Prior art]
FIG. 6 shows a spouted container for filling a liquid beverage, a liquid detergent or the like. As shown in the figure, the spout-equipped container has a spout S mounted on a container body A formed by a bag-shaped body member B and a bottom member C that closes a lower end opening of the body member B. Yes, the body member B and the bottom member C are both formed of a heat-adhesive resin sheet.
[0003]
As shown in FIG. 6 and FIGS. 7A and 7B, the body member B is formed on an outer layer film 51 formed of a relatively heat-resistant synthetic resin film such as biaxially stretched polyamide. The thermal adhesive resin sheet 50 in which the thermal adhesive resin layer 53 made of linear low density polyethylene or the like is laminated through 52 is abutted between the end faces so that the thermal adhesive resin layer 53 is on the inside, The heat-adhesive resin tape 60 is heat-sealed from the inner surface side to the abutting portion, and is formed into a cylindrical shape in the lower end opening of the body member B thus formed in a cylindrical shape. The peripheral wall c2 is heat-sealed to the inner peripheral surface (thermoadhesive resin layer 53) of the body member B in a state in which the bottom member C in which the annular peripheral wall c2 is suspended from the peripheral edge of the bottom plate c1 is fitted.
[0004]
Therefore, it is necessary to impart thermal adhesiveness to both the front and back surfaces of the thermal adhesive resin tape 60 connecting the butted portions of the body member B. As shown in FIG. 60 has a multilayer structure in which a heat-adhesive resin layer 63 is laminated by dry lamination or the like on both surfaces of a tape base 61 formed of a synthetic resin film such as biaxially stretched polyamide via an adhesive layer 62. Yes.
[0005]
[Problems to be solved by the invention]
By the way, when the body member B of the container main body A is formed by connecting the heat-adhesive resin sheet 50 with the heat-adhesive resin tape 60 having the multilayer structure as described above, as shown in FIG. The end surfaces on both sides in the width direction of the adhesive resin tape 60 are exposed in the container main body A, and the liquid beverage or liquid detergent filled in the container main body A constitutes the thermal adhesive resin tape 60. It will be in direct contact with the agent layer 62.
[0006]
When the content filled in the spouted container is a food such as a liquid beverage, when the liquid beverage comes into contact with the adhesive layer 62 constituting the heat-adhesive resin tape 60, the adhesive component dissolves in the liquid beverage. In addition, when the content is a surfactant such as a liquid detergent, the liquid detergent comes into contact with the adhesive layer 62 constituting the heat-adhesive resin tape 60, whereby the adhesive layer 62 There exists a problem that adhesiveness falls and the heat adhesive resin layer 63 becomes easy to peel from the tape base material 61. FIG.
[0007]
Then, even if it connects the heat adhesive resin sheet with the heat adhesive resin tape of the multilayer structure which has an adhesive bond layer, the subject of this invention is the heat adhesive resin sheet which the end surface of a heat adhesive resin tape does not expose. To provide a connection structure and a connection method.
[0008]
[Means for solving the problems and effects thereof]
In order to solve the above-described problem, the present invention is configured to heat-seal a heat-adhesive resin tape in which a plurality of resin layers are laminated via an adhesive layer to a connection portion of a heat-adhesive resin sheet. In the connection structure of the thermal adhesive resin sheet to which the adhesive resin sheet is connected, the thermal adhesive resin tape has exposed thermal adhesive resin layers on both front and back surfaces, In the state where both sides in the width direction are folded back to one side, and the both sides of the folded back heat-adhesive resin tape are overlapped with the connection part of the heat-adhesive resin sheet, the heat-adhesive resin The present invention provides a connection structure for a heat-adhesive resin sheet, wherein the tape is heat-sealed.
[0009]
As described above, in the connection structure of the heat-adhesive resin sheet, the both sides in the width direction of the heat-adhesive resin tape folded back on one side are overlapped with the connection part of the heat-adhesive resin sheet, Since the heat-adhesive resin tape is heat-sealed to the heat-adhesive resin sheet, both end faces in the width direction of the heat-adhesive resin tape are not exposed, and the heat-adhesive resin sheet has a heat-adhesive property at the connection part Only the heat-adhesive resin layer of the resin tape is exposed.
[0010]
Moreover, since the thermoadhesive resin layer has exposed the thermoadhesive resin layer on both front and back surfaces, the both sides of the folded width direction are in a state where the thermoadhesive resin layers face each other. Therefore, when such a heat-adhesive resin tape is heat-sealed to the heat-adhesive resin sheet, the heat-adhesive resin layers corresponding to each other of the heat-adhesive resin tape are also heat-sealed at the same time. The both side portions are not restored to the original state, and the heat-adhesive resin sheet is reliably connected by the heat-adhesive resin tape that is folded back in the width direction.
[0011]
In this connection structure, a multi-layered thermoadhesive resin tape that is usually used is simply folded and used, so the material cost is low, and between the thermoadhesive resin layers exposed on both the front and back sides. By laminating a stretched resin film that has heat resistance compared to a heat-adhesive resin, expansion and contraction of the heat-adhesive resin tape can be easily suppressed, so the heat-adhesive resin tape can be used as a heat-adhesive resin sheet. There is also an advantage that it can be heat-sealed accurately and accurately.
[0012]
In the connection structure of the heat-adhesive resin sheet configured as described above, a heat-adhesive resin tape in which a plurality of resin layers are laminated via an adhesive layer is heat-sealed to a connection portion of the heat-adhesive resin sheet. In the connecting method of the heat-adhesive resin sheet for connecting the heat-adhesive resin sheet, the both sides in the width direction of the heat-adhesive resin tape in which the heat-adhesive resin layers are exposed on both the front and back surfaces The heat-adhesive resin tape is heat-sealed in a state where the both sides of the heat-adhesive resin tape folded back to one side are overlapped with the connection portions of the heat-adhesive resin sheet. This is realized by the connection method according to Item 2.
[0013]
In addition, the heat-adhesive resin tape may be supplied to the connection part of the heat-adhesive resin sheet while folding back both sides in the width direction at the stage of heat-sealing. It is also possible to manufacture a heat-adhesive resin tape in a state in advance and supply it to the connection portion of the heat-adhesive resin sheet.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments will be described with reference to the drawings. As shown in FIG. 1, the spout S is attached to the container main body A in which the lower end opening of the cylindrical body member B is closed by the bottom member C composed of the disc-shaped bottom plate c1 and the annular peripheral wall c2. In the spout-equipped container, the connection method of the thermoadhesive resin sheet when forming the cylindrical body member B by connecting both end portions of the thermoadhesive resin sheet with the thermoadhesive resin tape is shown.
[0015]
As the heat-adhesive resin sheet forming the body member B, as shown in FIG. 1 (c), formed by a synthetic resin film such as biaxially stretched polyamide, biaxially stretched polyester, or biaxially stretched polypropylene, For example, the outer layer film 11 having a thickness of 9 to 30 μm is made of linear low density polyethylene, polypropylene, or the like, for example, having a thickness of 50 to 200 μm, through an adhesive layer 12 made of urethane resin or the like. A laminate sheet in which the resin layer 13 is laminated by dry lamination is used. As a thermal adhesive resin tape for connecting both ends of the thermal adhesive resin sheet 10, as shown in FIG. Formed of a synthetic resin film such as biaxially stretched polyamide, biaxially stretched polyester, or biaxially stretched polypropylene. A heat-adhesive resin layer 23a having a thickness of, for example, 30 μm and a thickness of, for example, 30 μm are formed on both surfaces of a tape substrate 21 having a thickness of ˜30 μm via adhesive layers 22a and 22b. A laminate tape having a multilayer structure in which a 50 μm thermal adhesive resin layer 23b is laminated by dry lamination is used.
[0016]
First, the both sides in the width direction W of the thermoadhesive resin tape 20 shown in FIG. 1A are folded back to the side of the thermoadhesive resin layer 23a having a thickness of 30 μm as shown by arrows in FIG. As shown in (b), both end faces are butted.
[0017]
Next, as shown in FIG. 4C, the end surfaces of the heat-adhesive resin sheet 10 for forming the body member B are abutted so that the heat-adhesive resin layer 13 is inside, and the width direction W The abutting portions of the heat-adhesive resin tape 20 whose both side portions are folded are overlapped on the inner surface side of the abutting portion (connecting portion) of the heat-adhesive resin sheet 10.
[0018]
Then, from the outer surface side of the heat-adhesive resin sheet 10, when the butted portion (connection portion) of the heat-adhesive resin sheet 10 on which the heat-adhesive resin tape 20 is overlaid is heated and pressed with a seal bar, the same figure (d) is obtained. As shown, the heat-adhesive resin layer 13 exposed on the inner surface side of the heat-adhesive resin sheet 10 and the heat-adhesive resin layer 23b exposed on the outer surface side of the folded side portions heat each other. In addition to being sealed, the heat-adhesive resin layers 23a of the heat-adhesive resin tape 20 are heat-sealed with each other at the folded side portions. In this way, the heat-adhesive resin layers 23a of the heat-adhesive resin tape 20 are heat-sealed with each other, whereby the folded state of the heat-adhesive resin tape 20 is maintained, and the both sides once folded are the original. Since the state is not restored, the butted portion of the thermoadhesive resin sheet 10 is reliably connected by the thermoadhesive resin tape 20, and the cylindrical body member B is formed.
[0019]
As shown in FIG. 2 (a), the lower end opening of the body member B formed in a cylindrical shape is formed of a stretchable synthetic resin film such as unstretched polypropylene, unstretched polyester, or unstretched polyamide. Thermal adhesion in which a heat-adhesive resin layer 33 having a thickness of about 60 to 200 μm made of linear low density polyethylene or the like is laminated on the outer layer film 31 having a thickness of about 60 to 300 μm via an adhesive layer 32 When the bottom member C formed by pressure-molding the adhesive resin sheet 30 is fitted, and the peripheral wall c2 portion is heated and pressed over the entire circumference of the body member B by the seal bar from the outer surface side of the heat-adhesive resin sheet 10. As shown in (b), the thermal adhesive resin layer 13 of the thermal adhesive resin sheet 10 exposed on the inner surface side of the body member B and the thermal adhesive resin tape 20 of the thermal adhesive resin tape 20. The oil layer 23b and the heat-adhesive resin layer 33 of the bottom member C are heat-sealed with each other, and the bottom member C is attached to the body member B.
[0020]
When the cylindrical body member B is formed by connecting the butted portions of the heat-adhesive resin sheet 10 with the heat-adhesive resin tape 20 by the method as described above, as shown in FIG. Both end surfaces in the width direction W of the adhesive resin tape 20 are not exposed to the inner side of the cylindrical body B, and the heat-adhesive resin tape 20 is attached to the butted portion (connection portion) of the heat-adhesive resin sheet 10. Only the thermal adhesive resin layer 23b is exposed.
[0021]
Therefore, even if the container body A having the body member B formed in this way is filled with a liquid beverage, a liquid detergent, or the like, the contents such as the filled liquid beverage or the liquid detergent are still thermally bonded resin tape. 20 adhesive layers 22a, 22b without direct contact, the adhesive components of the adhesive layers 22a, 22b are dissolved into the contents, or the adhesive layer 22a, by a surface active agent such as a filled liquid detergent The adhesiveness of 22b is lowered, and the heat-adhesive resin layers 23a and 23b are not peeled off from the tape base material 21.
[0022]
Further, as described above, since only the thermal adhesive resin layer 23b of the thermal adhesive resin tape 20 is exposed at the connection portion of the thermal adhesive resin sheet 10, the side end surface of the thermal adhesive resin tape is exposed. As in the conventional connection structure, the bottom member attached to the lower end opening of the body member does not come into contact with the tape base material, which is a non-adhesive portion of the heat-adhesive resin tape, and the bottom portion with respect to the body member B There is also an effect that the sealing performance of the material C is improved.
[0023]
In addition, as described above, the heat-adhesive resin tape 20 is made by simply folding back and using both sides of a tape obtained by cutting a laminate film having a multi-layer structure, which is usually employed, into an appropriate width, so that the material cost is low. The heat-adhesive resin is formed by laminating a relatively heat-resistant stretched resin film formed of biaxially stretched polyamide or the like between the heat-adhesive resin layers 23a and 23b exposed on the front and back surfaces. Since the expansion and contraction of the tape 20 can be easily suppressed, there is also an advantage that the heat-adhesive resin tape 20 can be accurately heat-sealed to the heat-adhesive resin sheet 10 with high accuracy.
[0024]
In the above-described embodiment, the thermal adhesive resin tape 20 is overlapped with the thermal adhesive resin sheet 10 so that the abutting portion of the thermal adhesive resin sheet 10 and the abutting portion of the thermal adhesive resin tape 20 coincide with each other. As shown in FIGS. 3A and 3B, the heat-adhesive resin tape 20 is bonded to the heat-adhesive resin so that the butted portions 10a and 20a do not coincide with each other. It is desirable to heat-seal over the sheet 10. With such a connection structure, even if the thermal adhesion between the thermal adhesive resin layers 23 a in the folded portion of the thermal adhesive resin tape 20 is insufficient, the thermal adhesive resin layer 23 b is not the thermal adhesive resin sheet 10. Therefore, there is an advantage that the heat-adhesive resin sheets 10 can be reliably connected to each other.
[0025]
Moreover, in each embodiment mentioned above, although both the side parts of the thermoadhesive resin tape 20 are turned back so that both end surfaces may be faced, it is not limited to this, FIG. 4 (a), (b) As shown in FIG. 2, even if the both sides of the heat-adhesive resin tape 20 are folded so that a certain distance L is formed between the end faces of the both sides, the heat-adhesive resin layer 23b is heated. If both are overlapped and heat-sealed so as to be surely thermally bonded to the butted portion 10a of the adhesive resin sheet 10, there is no problem.
[0026]
Moreover, in each embodiment mentioned above, in the state which faced | matched the end surfaces of the heat bondable resin sheet 10, the heat bondable resin tape 20 is piled up and heat-sealed on the butted part, However, It is limited to this. Instead, as shown in FIG. 5, in the state where the side edges of the heat-adhesive resin sheet 10 are overlapped with each other, the same heat-adhesive resin tape 20 is heat-sealed to the overlapping portion. It is also possible.
[0027]
Further, the heat-adhesive resin tape 20 may be supplied to the connection portion of the heat-adhesive resin sheet 10 while folding both side portions in the width direction W at the stage of heat-sealing the heat-adhesive resin sheet 10. It is also possible to manufacture the heat-adhesive resin tape 20 in a state where both sides of W are folded and lightly heat-sealed in advance, and supply this to the connection portion of the heat-adhesive resin sheet 10.
[0028]
In addition, the materials and thicknesses of the thermal adhesive resin sheet 10 and the thermal adhesive resin tape 20 constituting the thermal adhesive resin tape 20 are not limited to those employed in the above-described embodiments. In view of strength, adhesiveness, etc., it may be selected and set as appropriate.
[0029]
Moreover, in each embodiment mentioned above, although the connection method and connection structure of the thermoadhesive resin sheet at the time of forming the trunk | drum member B of the container main body A in a container with a spout were demonstrated, of the thermoadhesive resin sheet of this invention A connection method and a connection structure are not limited to this, It can apply when manufacturing the various container formed with a thermoadhesive resin sheet.
[Brief description of the drawings]
FIGS. 1A to 1D are process diagrams showing a method for connecting a thermoadhesive resin sheet according to the present invention.
FIGS. 2A and 2B are cross-sectional views showing a process of attaching a bottom member to a lower end opening of a body member formed by connecting a thermoadhesive resin sheet using the connection method described above. is there.
FIGS. 3A and 3B are cross-sectional views showing a connection method and a connection structure of a thermoadhesive resin sheet according to another embodiment.
4A and 4B are cross-sectional views showing a connection method and a connection structure of a thermoadhesive resin sheet according to another embodiment.
FIG. 5 is a cross-sectional view showing a connection structure of a thermoadhesive resin sheet according to another embodiment.
FIG. 6 is a perspective view showing a spouted container.
FIGS. 7A and 7B are cross-sectional views showing a conventional thermal adhesive resin sheet connection method and connection structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Thermal-adhesive resin sheet 11 Outer layer film 12 Adhesive layer 13 Thermal-fusion resin layer 20 Thermal-adhesive resin tape 21 Tape base materials 22a and 22b Adhesive layers 23a and 23b Thermal-adhesive resin layer B Trunk member C Bottom member

Claims (2)

Thermal adhesiveness to which the thermal adhesive resin sheet is connected by heat-sealing a thermal adhesive resin tape in which a plurality of resin layers are laminated via an adhesive layer to a connection portion of the thermal adhesive resin sheet In the resin sheet connection structure,
The thermal adhesive resin tape has a thermal adhesive resin layer exposed on both front and back surfaces,
The thermal adhesive resin tape has both sides in the width direction folded back to one side,
The heat-adhesive resin tape is heat-sealed in a state where the both side portions of the folded heat-adhesive resin tape are overlapped with the connection portion of the heat-adhesive resin sheet. Structure of conductive resin sheet. Thermal bonding in which the heat-adhesive resin sheet is connected by heat-sealing a heat-adhesive resin tape in which a plurality of resin layers are laminated via an adhesive layer to a connection portion of the heat-adhesive resin sheet. In the connection method of the conductive resin sheet,
Fold both sides in the width direction of the heat-adhesive resin tape where the heat-adhesive resin layers are exposed on both front and back sides to one side,
The heat-adhesive resin tape is heat-sealed in a state where the both side portions of the folded heat-adhesive resin tape are overlapped with the connection portion of the heat-adhesive resin sheet. Connection method of adhesive resin sheet.

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