JP2001252983A - Connecting structure of heat adhesive resin sheet and method for connecting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting structure of a heat adhesive resin sheet which does not expose an end face of a heat adhesive resin tape even when the sheet is connected by the heat adhesive resin tape of a plural-layer structure having an adhesive layer and a method for connecting. SOLUTION: The heat adhesive resin tape 20 of a plural-layer structure is superposed on the heat adhesive resin tape 30 of a single-layer structure. Then, the heat adhesive resin sheet 10 is butted at end faces so that its heat adhesive resin layer 13 becomes an inside, and the tapes 20, 30 are superposed on an inner surface side of the sheet 10 so that the tape 20 is contacted with the butted parts. Thus, when the butted parts of the sheet 10 superposed with the tapes 20, 30 is heated and pressed by a sealing roller from an outer surface side of the sheet 10, the butted parts of the sheet 10 are connected in a state in which an end face of the tape 20 is not exposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure and a connection method for a heat-adhesive resin sheet used when manufacturing, for example, a pouch container formed of the heat-adhesive resin sheet.

[0002]

2. Description of the Related Art FIG. 8 shows a container with a spout for filling a liquid beverage, a liquid detergent and the like. The spout-equipped container has a spout S attached to a container body A formed of a bag-shaped body member B and a bottom member C closing a lower end opening of the body member B, as shown in FIG. Yes,
The body member B and the bottom member C are both formed of a heat-adhesive resin sheet.

The body member B is shown in FIGS. 8 and 9 (a),
As shown in (b), thermal bonding made of linear low-density polyethylene or the like via an adhesive layer 52 to an outer layer film 51 formed of a synthetic resin film having relatively heat resistance such as biaxially stretched polyamide. The heat-adhesive resin sheet 50 on which the adhesive resin layer 53 is laminated is abutted against each other such that the heat-adhesive resin layer 53 is on the inner side, and a heat-adhesive resin tape 60 is heat-sealed to the abutted portion from the inner surface side. In this manner, a bottom member C having an annular peripheral wall c2 hanging down from the periphery of the disc-shaped bottom plate c1 is formed at the lower end opening of the body member B thus formed in a cylindrical shape. In the fitted state, the peripheral wall c2 is
Is heat-sealed to the inner peripheral surface (heat-adhesive resin layer 53).

Accordingly, 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.
The heat-adhesive resin tape 60 has an adhesive layer formed on both sides of a tape base 61 formed of a synthetic resin film such as biaxially stretched polyamide, for example, by an adhesive for dry lamination made of a urethane-based resin or the like. It has a multi-layer structure in which a heat-adhesive resin layer 63 is laminated via the respective layers 62.

[0005]

When the body member B of the container body A is formed by connecting the heat-adhesive resin sheets 50 with the heat-adhesive resin tape 60 having a multilayer structure as described above, FIG. As shown in (b), the end surfaces on both sides in the width direction of the thermo-adhesive resin tape 60 are exposed in the container main body A, and the liquid beverage, the liquid detergent or the like filled in the container main body A has the heat-adhesive property. It comes into direct contact with the adhesive layer 62 constituting the resin tape 60.

When the contents to be filled in the container with a spout are foods such as liquid beverages, when the liquid beverage comes into contact with the adhesive layer 62 constituting the heat-adhesive resin tape 60, the adhesive component is converted into the liquid beverage. 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, thereby causing the adhesive to dissolve. There is a problem that the adhesiveness of the layer 62 is reduced and the heat-adhesive resin layer 63 is easily peeled off from the tape base material 61.

[0007] Therefore, an object of the present invention is to provide a thermo-adhesive resin tape in which the end faces of the thermo-adhesive resin tape are not exposed even when the thermo-adhesive resin sheet is connected by a multi-layer thermo-adhesive resin tape having an adhesive layer. It is to provide a connection structure and a connection method for a resin sheet.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method for thermally bonding a multi-layered thermo-adhesive resin tape in which a plurality of resin layers are laminated via an adhesive layer. In the connection structure of the thermo-adhesive resin sheet to which the thermo-adhesive resin sheet is connected by heat-sealing to the junction of the thermo-resin sheet, the multilayer heat-sealed to the junction of the thermo-adhesive resin sheet The heat-adhesive resin tape having a single-layer structure or a multilayer structure laminated without interposing an adhesive layer so as to cover the heat-adhesive resin tape having a structure is heat-sealed to the heat-adhesive resin sheet. It is intended to provide a connection structure for a heat-adhesive resin sheet characterized by the following.

As described above, the connection structure of the heat-adhesive resin sheet covers the heat-adhesive resin tape having a multilayer structure having an adhesive layer, which is heat-sealed to the connection portion of the heat-adhesion resin sheet. In addition, since the heat-adhesive resin tape having a single-layer structure or a multi-layer structure having no adhesive layer is heat-sealed to the heat-adhesive resin sheet, the heat-adhesive resin tape having a multi-layer structure having an adhesive layer is provided. Both end surfaces in the width direction are not exposed, and only the heat-adhesive resin tape having a single-layer structure or a multi-layer structure having no adhesive layer is exposed at the connection portion of the heat-adhesive resin sheet. .

Further, as in the connection structure according to the second aspect, the heat-adhesive resin tape having a multilayer structure having an adhesive layer has a heat-adhesive resin layer on both front and back surfaces. The heat-sealing resin tape with a multi-layer structure with an adhesive layer and the heat-sealing resin tape with a single-layer structure or a multi-layer structure without an adhesive layer are integrated by heat sealing with each other. Therefore, the strength of the heat-adhesive resin tape itself is improved, and the heat-adhesive resin tape having a multilayer structure having an adhesive layer in which a stretched resin film is laminated does not have a single-layer structure or an adhesive layer. A heat-sealing resin tape having a single-layer structure or a multi-layer structure without an adhesive layer when the heat-sealing resin tape is supplied by heat-sealing the heat-sealing resin tape with a multi-layer structure in advance. Can be easily reduced Since kill, accurately thermal adhesive resin tape to thermally adhesive resin sheet is cleanly advantage that can be heat sealed.

Further, in this connection structure, at the connection portion of the heat-adhesive resin sheet, a heat-adhesive resin tape having a multi-layer structure having an adhesive layer and a single-layer structure or a multi-layer structure having no adhesive layer are provided. Thin-walled heat-sealed resin tape with only a single-layered structure or a multi-layered structure without adhesive layer on both sides of the thick part that is heat-sealed with the heat-adhesive resin tape superposed Since the portion is formed, the thickness at the connection portion of the heat-adhesive resin sheet changes stepwise, so that an extreme step is formed between the connection portion of the heat-adhesive resin sheet and other portions. In the case where the bottom member is heat-sealed to a cylindrical body member having such a connection structure, good sealing performance can be ensured.

Further, in this connection structure, a heat-bonding resin tape having a single-layer structure or a multi-layer structure having no adhesive layer, which is usually used for a multi-layer heat-adhesive resin tape having an adhesive layer, which is usually used, is used. The material cost is low because only the heat-sealing resin tapes are overlapped and heat-sealed, and the connection structure of the heat-adhesive resin sheet in which the end face of the multi-layer heat-adhesive tape having the adhesive layer is not exposed is realized at low cost. be able to.

[0013] The connection structure of the heat-adhesive resin sheet having the above-described structure is such that the heat-adhesive resin tape has a multilayer structure in which a plurality of resin layers are laminated via an adhesive layer. Laminate the heat-adhesive resin tape of a multilayer structure having a single-layer structure wider than the adhesive resin tape or a multilayer structure without interposing an adhesive layer on the heat-adhesive resin tape of a multilayer structure having an adhesive layer. The heat-adhesive resin tape having a multilayer structure having an adhesive layer is brought into contact with a connection portion of a heat-adhesive resin sheet so that the heat-adhesive resin tape having a multilayer structure having an adhesive layer is simply joined to the heat-adhesive resin tape having the adhesive layer. 4. The connection method according to claim 3, wherein the heat bonding resin tape having a layer structure or a multilayer structure having no adhesive layer is heat-sealed to a connection portion of the heat bonding resin sheet. .

The heat-adhesive resin tape having a multi-layer structure having an adhesive layer and the heat-adhesive resin tape having a single-layer structure or a multi-layer structure having no adhesive layer are mutually sealed at the stage of heat sealing. It may be supplied to the connection part of the heat-adhesive resin sheet while being superimposed on each other, or both may be overlapped in advance and lightly heat-sealed, and then supplied to the connection part of the heat-adhesive resin sheet. .

[0015]

Embodiments will be described below with reference to the drawings. FIG. 1A shows, as shown in FIG.
In a spout-equipped container in which a spout S is mounted on a container body A in which a lower end opening of a cylindrical body member B is closed by a bottom member C composed of a disk-shaped bottom plate c1 and an annular peripheral wall c2, The connection structure of the heat-adhesive resin sheet when the both ends of the sheet are connected by a heat-adhesive resin tape to form a cylindrical body member B is shown.

The body member B is made of a synthetic resin film such as biaxially stretched polyamide, biaxially stretched polyester or biaxially stretched polypropylene, as shown in FIGS. A 50-200 μm thick heat-adhesive resin layer 13 made of linear low-density polyethylene, polypropylene or the like is dry-laminated on an outer layer film 11 having a thickness of 9-30 μm via an adhesive layer 12 made of a urethane resin or the like. The heat-adhesive resin sheet 10 is formed into a cylindrical shape by abutting both ends of the heat-adhesive resin sheet 10 and heat-sealing a heat-adhesive resin tape to the abutted portion. I have. The heat-adhesive resin sheet 10
Further, a film on which an inorganic substance such as aluminum or silicon oxide is deposited, or a gas barrier layer such as EVOH can be further laminated.

As shown in FIGS. 1A and 1B, a biaxially stretched polyamide or a biaxially stretched polyester is used as the thermoadhesive resin tape which is heat-sealed to the butted portion of the thermoadhesive resin sheet 10. 9-30 μm thick tape substrate 21 formed of a synthetic resin film
On both sides of the substrate through an adhesive layer 22a, 22b, a thickness 20 made of linear low-density polyethylene, polypropylene, or the like.
Thermal adhesive resin tape 20 having a multilayer structure in which thermal adhesive resin layers 23a and 23b each having a thickness of about 100 μm are laminated by dry lamination, and a thermal adhesive resin having a thickness of 20 to 100 μm made of linear low-density polyethylene, polypropylene, or the like. And a single-layered heat-adhesive resin tape 30 formed by the above method.
Are formed wider than the heat-adhesive resin tape 20 having a multilayer structure.

In order to form a cylindrical body member B from the heat-adhesive resin sheet 10 and the heat-adhesive resin tapes 20 and 30 configured as described above, first, as shown in FIG. As a single-layered heat-adhesive resin tape 30 projects from both ends in the width direction of the multi-layered heat-adhesive resin tape,
The multi-layered thermo-adhesive resin tape 20 is superimposed on the central portion of the single-layered thermo-adhesive resin tape 30 in the width direction.

Next, as shown in FIG.
The heat-adhesive resin sheet 10 for forming the heat-adhesive resin sheet 20 is joined to the heat-adhesive resin sheet 20 such that the heat-adhesive resin layer 13 is on the inside.
The heat-adhesive resin tape 20 and the heat-adhesive resin tape 30 are overlapped on the inner surface side of the heat-adhesive resin sheet 10 so as to come into contact with the butted portion (connection portion).

Then, when the butted portion (connection portion) of the heat-adhesive resin sheet 10 on which the heat-adhesive resin tape 20 is superimposed is heated and pressed by a seal roller or a seal bar from the outer surface side of the heat-adhesive resin sheet 10, As shown in FIG. 1A, the heat-adhesive resin layer 13 exposed on the inner surface side of the heat-adhesive resin sheet 10, the heat-adhesive resin layer 23 a of the heat-adhesive resin tape 20 having a multilayer structure, and The heat adhesive resin tape 30 having a layer structure is heat-sealed with each other, and the heat adhesive resin layer 23b of the heat adhesive resin tape 20 having a multilayer structure and the heat adhesive resin tape 3 having a single layer structure are formed.
0 are heat-sealed to each other.

More specifically, as shown in FIG. 3, the heat-adhesive resin sheet 1 unwound from a sheet roll R1 in which a long strip-shaped heat-adhesive resin sheet 10 is wound into a roll shape.
The tape rolls R2 and R3 are formed by winding the long band-shaped thermo-adhesive resin tapes 20 and 30 into a roll shape while winding both side portions of the tape No. 0 upward and shaping the end surfaces of both sides into a cylindrical shape. The inner surfaces of the butted portions of the thermo-adhesive resin sheet 10 formed into a cylindrical shape via the guide rollers G3 while the thermo-adhesive resin tapes 20 and 30 respectively drawn out from each other are overlapped with each other by the guide rollers G1 and G2. Side, and as shown in FIG.
By sandwiching the butted portion of the thermo-adhesive resin sheet 10 between the seal roller SR and the receiving roller CR, the butted portion of the thermo-adhesive resin sheet 10 and the thermo-adhesive resin tapes 20 and 30 are continuously heat-sealed. As shown in FIG. 3B, the butt portion of the heat-adhesive resin sheet 10 and the heat-adhesive resin tape 20 are sandwiched between the seal bar SB and the receiving bar CB.
30 may be intermittently heat-sealed.

As described above, the heat-adhesive resin tape 20 having a multilayer structure is heat-sealed to the butted portion (connection portion) of the heat-adhesive resin sheet 10, so that the butted portion of the heat-adhesive resin sheet 10 is securely formed. The cylindrical body member B is formed by being connected, and the heat-sealed single-layered heat-adhesive resin tape 30 is completely covered with the heat-sealed single-layered heat-adhesive resin tape 30.

The body member B thus formed into a cylindrical shape
As shown in FIG. 5 (a), an outer layer film 41 having a thickness of about 60 to 300 μm formed of a stretchable synthetic resin film such as unstretched polypropylene, unstretched polyester, or unstretched polyamide is provided at the lower end opening of Formed through pressure bonding of a heat-adhesive resin sheet 40 on which a heat-adhesive resin layer 43 made of linear low-density polyethylene or the like and having a thickness of about 60 to 200 μm is laminated via an adhesive layer 42. The bottom member C is fitted and the peripheral wall c2 is inserted from the outer surface side of the heat-adhesive resin sheet 10 with a seal bar.
When the portion is heated and pressed over the entire circumference of the body member B, as shown in FIG. 3B, the heat-adhesive resin layer 13 and the single layer of the heat-adhesive resin sheet 10 exposed on the inner surface side of the body member B are exposed. The heat-adhesive resin tape 30 having the structure and the heat-adhesive resin layer 43 of the bottom member C are heat-sealed to each other, and the bottom member C is attached to the body member B.

By connecting the butted portions of the thermo-adhesive resin sheet 10 with the thermo-adhesive resin tapes 20 and 30 superposed on each other by the above-described method, a cylindrical body member B is formed. As shown in FIG. 5, both end surfaces of the heat-adhesive resin tape 20 having a multilayer structure are not exposed to the inner side of the cylindrical body B, and are provided at the butted portions (connection portions) of the heat-adhesive resin sheet 10. In this case, only the heat-adhesive resin tape 30 having a single-layer structure is exposed.

Therefore, even if the liquid body or the liquid detergent is filled in the container body A having the body member B formed in this way, the contents of the filled liquid drink or the liquid detergent are thermally bonded. Without directly contacting the adhesive layers 22a and 22b of the conductive resin tape 20, the adhesive components of the adhesive layers 22a and 22b dissolve into the contents, and the adhesive is applied by a surfactant such as a filled liquid detergent. The adhesiveness of the layers 22a and 22b decreases, and the heat-adhesive resin layer 23
a and 23b do not peel off.

Also, a multi-layered heat-adhesive resin tape 20
Has the heat-adhesive resin layers 23a and 23b on both front and back sides, so that the heat-adhesive resin tapes 2
By heat-sealing 0, 30 to the butted portion of the heat-adhesive resin sheet 10, the heat-adhesive resin tape 20 having a multilayer structure and the heat-adhesive resin tape 30 having a single-layer structure are heat-sealed to each other. Since they are integrated, the strength of the heat-adhesive resin tapes 20 and 30 themselves is improved.

As shown in FIG. 1, the connection portion of the heat-adhesive resin sheet 10 is in a state where the heat-adhesive resin tape 20 having a multilayer structure and the heat-adhesive resin tape 30 having a single-layer structure are overlapped. On both sides of the thick-walled portion heat-sealed, a thin-walled portion formed by heat-sealing only the single-layered thermo-adhesive resin tape 30 is formed. Is changed step by step, so that no extreme level difference occurs between the connection portion of the heat-adhesive resin sheet 10 and the other portions, and as shown in FIG. When the bottom member C is heat-sealed, good sealing performance can be ensured.

In this connection structure, a single-layered heat-bonded resin film formed of a general film is attached to a heat-adhesive resin tape 20 manufactured from a multi-layered film which is usually employed as a packaging film. The material cost is low because only the adhesive resin tape 30 is overlapped and heat-sealed to the butted portion of the heat-adhesive resin sheet 10.
The connection structure of the heat-adhesive resin sheet in which the end face of the heat-adhesive tape having the multilayer structure is not exposed can be realized at low cost.

In the above-described embodiment, the multi-layered thermo-adhesive resin tape 20 having the thermo-adhesive resin layers 23a and 23b on both front and back surfaces is used. If the butted portions of the heat-adhesive resin sheet 10 can be reliably connected by
As shown in FIGS. 6 (a) and 6 (b), the heat-sealing resin tape of the multilayer structure and the heat-sealing resin tape of the single-layer structure do not always need to be heat-sealed. Alternatively, a heat-adhesive resin layer 23 made of linear low-density polyethylene, polypropylene, or the like is laminated on one surface of a tape base 21 formed of a synthetic resin film such as biaxially stretched polyester via an adhesive layer 22. It is also possible to use a two-layered heat-adhesive resin tape 20a. With such a connection structure, as shown in FIG. 3 (b), the thickness of the thermo-adhesive resin tape 20a having a multilayer structure is reduced, so that the connection portion of the thermo-adhesive resin sheet 10 and the other portions This has the effect that the step formed between them can be reduced.

Further, in each of the above-described embodiments, in a state where the end surfaces of the heat-adhesive resin sheet 10 abut against each other, the heat-adhesive resin tapes 20 and 30 are overlapped on the abutting portion and heat-sealed. However, the present invention is not limited to this. As shown in FIG. 7, in a state where the side edges of the heat-adhesive resin sheet 10 are overlapped with each other,
A similar thermo-adhesive resin tape 2
It is also possible to heat seal 0 and 30.

In the above-described embodiment, the two types of thermo-adhesive resin tapes 20 and 30 are simply overlapped with each other.
The heat-adhesive resin sheet 10 is supplied to the butted portion.
When the two layers are overlapped with each other, if both are lightly heat-sealed, the unstretched single-layer structure is formed by the heat-adhesive resin tape 20 having a multi-layer structure, in which the stretched film is laminated, and which is difficult to expand and contract. Since the expansion and contraction of the thermo-adhesive resin tape 30 can be suppressed, the thermo-adhesive resin tape 3
0 can be precisely and neatly heat-sealed to the heat-adhesive resin sheet 10.

In the above-described embodiment, the two types of heat-adhesive resin tapes 20 and 30 are supplied while being fed from the individually wound tape rolls R2 and R3. Adhesive resin tape 20,
It is also possible to manufacture a product obtained by heat-sealing the laminates 30 in advance, and supply this to the connection portion of the heat-adhesive resin sheet 10. By doing so, there is an effect that expansion and contraction of the thermo-adhesive resin tape 30 having an unstretched single-layer structure can be reliably suppressed.

In the above-described embodiment, the single-layered heat-adhesive resin tape 30 covers the multi-layered heat-adhesive resin tape 20. However, the present invention is not limited to this. Instead of the heat-adhesive resin tape 30 having a layer structure, for example, two types of heat-adhesive resin layers made of polyethylene or the like having different densities are laminated by co-extrusion molding without using an adhesive layer. As in the case of a resin tape, it is also possible to use a heat-adhesive resin tape having a multilayer structure laminated without interposing an adhesive layer.

Further, in each of the above-described embodiments, the connection method and the connection structure of the thermo-adhesive resin sheet when forming the body member B of the container body A in the spout-equipped container have been described. The connection method and connection structure of the resin sheet are not limited to those described above, and can be applied when manufacturing various containers formed of the heat-adhesive resin sheet.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing a connection structure of a heat-adhesive resin sheet according to the present invention, and FIG. 1B is an exploded cross-sectional view showing a connection structure of the same.

FIGS. 2A and 2B are process diagrams showing a method for connecting a heat-adhesive resin sheet according to the present invention.

FIG. 3 is a schematic configuration diagram showing an apparatus for performing the connection method according to the first embodiment;

FIGS. 4 (a) and 4 (b) are schematic structural views showing a heat sealing portion in the above device.

FIGS. 5A and 5B 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. 6A and 6B are cross-sectional views illustrating a connection method and a connection structure of a thermoadhesive resin sheet according to another embodiment.

FIG. 7 is a cross-sectional view showing a connection structure of a heat-adhesive resin sheet according to another embodiment.

FIG. 8 is a perspective view showing a container with a spout.

9 (a) and 9 (b) are cross-sectional views showing a conventional connection method and connection structure of a thermo-adhesive resin sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Thermal adhesive resin sheet 11 Outer film 12 Adhesive layer 13 Thermal adhesive resin layer 20, 30 Thermal adhesive resin tape 21 Tape base material 22a, 22b Adhesive layer 23a, 23b Thermal adhesive resin layer B Body member C Bottom member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B29L 22:00 B29L 22:00 F term (Reference) 3E064 AB28 BA17 BA27 BA29 BA30 BA36 BA54 BC18 EA07 FA04 FA05 GA04 HF06 HG03 HM01 HN65 HS07 3E075 BA47 BB02 CA02 DD03 DD13 DD33 GA04 4F211 AC03 AD05 AG03 AG07 AH56 AH58 TA05 TC16 TC17 TD07 TD11 TJ11 TN02 TN56

Claims (3)

[Claims] The heat-adhesive resin sheet is formed by heat-sealing a heat-adhesive resin tape having a multilayer structure 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 structure of the thermo-adhesive resin sheet to which the thermo-adhesive resin sheet is connected, a single-layer structure or an adhesive is provided so as to cover the multi-layer structure of the thermo-adhesive resin tape heat-sealed to the connection portion of the thermo-adhesive resin sheet A connection structure for a heat-adhesive resin sheet, wherein a heat-adhesive resin tape having a multilayer structure laminated without interposing layers is heat-sealed to the heat-adhesive resin sheet. 2. The connection structure for a thermo-adhesive resin sheet according to claim 1, wherein the thermo-adhesive resin tape having a multilayer structure having an adhesive layer has a thermo-adhesive resin layer on both front and back surfaces. 3. A single-layer structure or an adhesive layer wider than the heat-adhesive resin tape so as to cover the heat-adhesive resin tape having a multilayer structure in which a plurality of resin layers are laminated via an adhesive layer. The thermal adhesive resin tape having a multilayer structure, which is laminated without interposing the adhesive layer, is superimposed on the thermal adhesive resin tape having a multilayer structure having an adhesive layer, and the thermal adhesiveness having a multilayer structure having an adhesive layer is provided. In such a manner that the resin tape is brought into contact with the connection part of the heat-adhesive resin sheet, the heat-adhesive resin tape having a multi-layer structure having an adhesive layer and the single-layer structure or the multi-layer structure having no adhesive layer A method for connecting a heat-adhesive resin sheet, wherein a heat-adhesive resin tape is heat-sealed to a connection portion of the heat-adhesive resin sheet.