JP2001252982A - 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: Both sides of the heat adhesive resin tape 20 are folded to a heat adhesive resin layer 23a side, and both side end faces are butted. Then, the heat adhesive resin sheet 10 is butted at end faces so that the heat adhesive resin layer 13 becomes an inside, and butted parts of the tape 20 folded at both sides are superposed on the butted parts of the sheet 10. Thus, when the butted parts of the sheet 10 superposed with the tape 20 is heated and pressed by a sealing bar 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. 6 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. 6 and 7A,
As shown in (b), an outer layer film 51 formed of a relatively heat-resistant synthetic resin film such as biaxially stretched polyamide is heat-fused with a linear low-density polyethylene or the like via an adhesive layer 52. The end surfaces of the heat-adhesive resin sheet 50 on which the adhesive resin layer 53 is laminated are butted so that the heat-adhesive resin layer 53 is on the inside, and the heat-adhesive resin tape 60 is heated from the inner surface to the abutted portion. A bottom member C is formed in a cylindrical shape by sealing, and an annular peripheral wall c2 hangs down from the peripheral edge of the disc-shaped bottom plate c1 at the lower end opening of the body member B thus formed in a cylindrical shape. Is fitted, and 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 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 a heat-adhesive resin layer 63 laminated on both sides of a tape base material 61 formed of a synthetic resin film such as biaxially stretched polyamide through an adhesive layer 62 by dry lamination or the like. It has a multilayer structure.

[0005]

By the way, when the body member B of the container body A is formed by connecting the heat-adhesive resin sheets 50 by 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 relates to a method of forming a heat-adhesive resin tape in which a plurality of resin layers are laminated via an adhesive layer. By heat sealing to the connection part of
In the connection structure of the heat-adhesive resin sheet to which the heat-adhesive resin sheet is connected, the heat-adhesive resin tape has a heat-adhesive resin layer exposed on both front and back surfaces, and the heat-adhesive resin tape is In the state in which both sides in the width direction are folded back to one side, and the two sides of the folded-back thermoadhesive resin tape are superimposed on the connection portion of the thermoadhesive resin sheet, the heat bonding is performed. It is intended to provide a connection structure for a heat-adhesive resin sheet, wherein a conductive resin tape is heat-sealed.

As described above, in the connection structure of the heat-adhesive resin sheet, both sides in the width direction of the heat-adhesion resin tape folded on one side are overlapped with the connection portion of the heat-adhesion resin sheet. Since the heat-adhesive resin tape is heat-sealed to the heat-adhesive resin sheet, both end surfaces in the width direction of the heat-adhesive resin tape are not exposed. Only the heat-adhesive resin layer of the heat-adhesive resin tape is exposed.

[0010] In addition, since the heat-adhesive resin tape has the heat-adhesive resin layers exposed on both front and back surfaces, the folded side portions in the width direction are in a state where the heat-adhesive resin layers face each other. Become. 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 sides are not restored to the original state, and the thermally adhesive resin sheet having the folded both sides in the width direction is securely connected to the thermally adhesive resin sheet.

Further, in this connection structure, the heat-adhesive resin tape having a multi-layer structure, which is usually adopted, is simply folded and used, so that the material cost is low, and the heat-adhesive resin layers exposed on both front and back surfaces are used. By laminating a stretched resin film that is more heat-resistant than the heat-adhesive resin between them, expansion and contraction of the heat-adhesion resin tape can be easily suppressed. There is also the advantage that the resin sheet can be heat-sealed accurately and neatly.

[0012] The connection structure of the heat-adhesive resin sheet having the above-described structure is such that a heat-adhesive resin tape in which a plurality of resin layers are laminated via an adhesive layer is attached to the connection portion of the heat-adhesive resin sheet. In the method of connecting a heat-adhesive resin sheet, the heat-adhesive resin sheet is connected to the heat-adhesive resin sheet by heat-sealing. Both sides are folded back to one side, and the heat-bonded resin tape is heat-sealed in a state where the both sides of the folded-back thermo-adhesive resin tape are superimposed on a connection portion of the thermo-adhesive resin sheet. This is realized by the connection method according to claim 2.

The heat-adhesive resin tape may be supplied to the connection portion 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-sealed resin tape in a heat-sealed state in advance, and supply the heat-sealed resin tape to the connection portion of the heat-adhesive resin sheet.

[0014]

Embodiments will be described below with reference to the drawings. FIG. 1 shows 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 disc-shaped bottom plate c1 and an annular peripheral wall c2, as shown in FIG.
In a container with a spout having a spout S attached thereto, the heat-adhesive resin sheet is connected at the time of forming a cylindrical body member B by connecting both ends of the heat-adhesive resin sheet with a heat-adhesive resin tape. The method is shown.

As shown in FIG. 1C, the heat-adhesive resin sheet forming the body member B is formed of a synthetic resin film such as biaxially stretched polyamide, biaxially stretched polyester or biaxially stretched polypropylene. For example, the lower layer film 11 having a thickness of 9 to 30 μm is formed on the outer layer film 11 having a thickness of 9 to 30 μm through an adhesive layer 12 formed of a urethane resin or the like, and is formed of a linear low-density polyethylene, polypropylene, or the like. A laminated sheet in which the heat-adhesive resin layer 13 is laminated by dry lamination is used. As a heat-adhesive resin tape for connecting both ends of the heat-adhesive resin sheet 10, FIG. As shown, examples formed by a synthetic resin film such as biaxially oriented polyamide, biaxially oriented polyester or biaxially oriented polypropylene For example, on both sides of a tape base material 21 having a thickness of 9 to 30 μm, via adhesive layers 22a and 22b,
For example, a laminated tape having a multilayer structure in which a heat-adhesive resin layer 23a having a thickness of 30 μm and a heat-adhesive resin layer 23b having a thickness of 50 μm, for example, made of linear low-density polyethylene or polypropylene is laminated by dry lamination. It is used.

First, both sides in the width direction W of the thermo-adhesive resin tape 20 shown in FIG. 1A are folded back to the thermo-adhesive resin layer 23a having a thickness of 30 μm as shown by arrows in FIG. Then, as shown in FIG.

Next, as shown in FIG.
End portions of the heat-adhesive resin sheet 10 for forming the heat-adhesive resin layer 13 are set so that the heat-adhesive resin layer 13 is on the inner side, and both ends in the width direction W are folded back. Are overlapped on the inner surface side of the butted portion (connection portion) of the heat-adhesive resin sheet 10.

Then, when the butted portion (connecting portion) of the thermo-adhesive resin sheet 10 on which the thermo-adhesive resin tape 20 is superimposed is heated and pressed by a seal bar from the outer surface side of the thermo-adhesive resin sheet 10, FIG. As shown in d), 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 surfaces of the folded both sides are formed. While being heat-sealed to each other, the heat-adhesive resin layers 23a of the heat-adhesive resin tape 20 are heat-sealed to each other on both folded sides. As described above, the heat-bonding resin layers 23a of the heat-bonding resin tape 20 are heat-sealed to each other, so that the folded state of the heat-bonding resin tape 20 is maintained, and the once folded both sides are restored to the original state. Since the state is not restored, the butted portions of the heat-adhesive resin sheet 10 are securely connected by the heat-adhesive resin tape 20, and the cylindrical body member B is formed.

The body member B thus formed into a cylindrical shape
As shown in FIG. 2 (a), an outer layer film 31 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 30 on which a heat-adhesive resin layer 33 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 32. The bottom member C is fitted, and the peripheral wall c2
When the portion is heated and pressed over the entire circumference of the body member B, the heat bonding resin layer 13 and the heat bonding resin of the heat bonding resin sheet 10 exposed on the inner surface side of the body member B as shown in FIG. The heat-adhesive resin layer 23b of the conductive resin tape 20 and the heat-adhesive resin layer 33 of the bottom member C are mutually heat-sealed,
The bottom member C is mounted on the body member B.

By the above-described method, the butted portion of the heat-adhesive resin sheet 10 is
When the cylindrical body member B is formed by connecting
As shown in FIG. 1D, both end surfaces in the width direction W of the thermo-adhesive resin tape 20 are not exposed to the inner side of the cylindrical body B, and the butted portions of the thermo-adhesive resin sheet 10 are not exposed. Only the heat-adhesive resin layer 23b of the heat-adhesive resin tape 20 is exposed at the (connection portion).

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.

As described above, since only the heat-adhesive resin layer 23b of the heat-adhesive resin tape 20 is exposed at the connection portion of the heat-adhesive resin sheet 10, the side end surface of the heat-adhesive resin tape is exposed. As in the conventional connection structure in which the bottom member is exposed, the bottom member attached to the lower end opening of the body member does not come into contact with the tape base or the like which is the non-adhered portion of the thermo-adhesive resin tape, and the body member There is also an effect that the sealing property of the bottom member C against B is improved.

Further, as described above, the heat-adhesive resin tape 20 is made by simply folding back both sides of a tape obtained by cutting a commonly used laminated film having an appropriate width into a suitable width, so that a material is used. The cost is low, and 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 both front and back sides, Since the expansion and contraction of the adhesive resin tape 20 can be easily suppressed, there is also an advantage that the heat adhesive resin tape 20 can be accurately and cleanly heat-sealed to the heat adhesive resin sheet 10.

In the above-described embodiment, the butted portion of the heat-adhesive resin sheet 10 and the heat-adhesive resin tape 2
The heat-adhesive resin tape 20 is superimposed on the heat-adhesive resin sheet 10 and heat-sealed so that the abutting part of the tapes coincides with each other, but FIGS. 3 (a) and 3 (b).
As shown in (1), it is desirable that the heat-adhesive resin tape 20 be superimposed on the heat-adhesive resin sheet 10 and heat-sealed so that the butted portions 10a and 20a do not coincide with each other. With such a connection structure, even if the heat bonding between the heat bonding resin layers 23a at the folded portion of the heat bonding resin tape 20 is insufficient, the heat bonding resin layer 23b is Is reliably bonded to the abutting portion 10a, so that there is an advantage that the heat-adhesive resin sheets 10 can be reliably connected to each other.

Further, in each of the above-described embodiments, both side portions of the thermo-adhesive resin tape 20 are folded back so that both side end surfaces abut each other. However, the present invention is not limited to this, and FIG. As shown in (b), even if both sides of the thermo-adhesive resin tape 20 are folded back so that a certain distance L is formed between the end surfaces of both sides, the thermo-adhesive resin layer If both are overlapped and heat-sealed so that 23b is reliably thermally bonded to the butted portion 10a of the heat-adhesive resin sheet 10, there is no particular problem.

Further, in each of the above-described embodiments, while the end surfaces of the heat-adhesive resin sheet 10 are butted against each other, the heat-adhesive resin tape 20 is overlapped on the butted portion and heat-sealed. The present invention is not limited to this. As shown in FIG. 5, in a state where the side edges of the thermo-adhesive resin sheet 10 are overlapped with each other, a similar thermo-adhesive resin tape 20 is applied to the overlapped portion. Heat sealing is also possible.

In the step of heat-sealing the heat-adhesive resin sheet 20 to the heat-adhesive resin sheet 10,
May be supplied to the connection portion of the thermo-adhesive resin sheet 10 while turning both sides of the thermo-adhesive resin sheet 20 in a state where both sides in the width direction W are turned back and lightly heat-sealed.
Can be manufactured in advance and supplied to the connection portion of the heat-adhesive resin sheet 10.

The material and thickness of the film and the heat-adhesive resin layer constituting the heat-adhesive resin sheet 10 and the heat-adhesive resin tape 20 are limited to those used in the above-described embodiments. Instead, it may be appropriately selected and set in consideration of strength, adhesiveness, and the like.

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]

FIGS. 1A to 1D are process diagrams showing a method for connecting a heat-adhesive 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 heat-adhesive resin sheet using the connection method described above. is there.

FIGS. 3A and 3B are cross-sectional views illustrating a connection method and a connection structure of a heat-adhesive resin sheet according to another embodiment.

FIGS. 4A and 4B are cross-sectional views showing a connection method and a connection structure of a heat-adhesive resin sheet according to another embodiment.

FIG. 5 is a cross-sectional view showing a connection structure of a heat-adhesive resin sheet according to another embodiment.

FIG. 6 is a perspective view showing a container with a spout.

7 (a) and 7 (b) are cross-sectional views illustrating a conventional connection method and a 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 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 BA27 BA30 BA36 BA54 BB03 EA07 EA18 FA04 GA04 HF06 HG03 HN05 HN65 HS07 3E075 BA47 BB02 CA02 DD03 DD13 DD33 GA04 4F211 AC03 AD05 AG03 AG07 AH56 AH58 TA05 TC16 TC17 TD07 TD11 TN02 TN56 4J040 JB01 NA06 PA23

Claims (2)

[Claims] 1. 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 structure of the heat-adhesive resin sheet, the heat-adhesive resin tape has a heat-adhesive resin layer exposed on both front and back surfaces, and the heat-adhesive resin tape has one side on both sides in the width direction. Side, and the both sides of the folded-back thermo-adhesive resin tape are
A connection structure for a heat-adhesive resin sheet, wherein the heat-adhesion resin tape is heat-sealed in a state of being superposed on a connection portion of the heat-adhesion resin sheet. 2. 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. The method for connecting a heat-adhesive resin sheet as described above, wherein both sides in the width direction of the heat-adhesive resin tape having the heat-adhesive resin layers exposed on both front and back sides are folded back to one side, The said both sides of the resin tape,
A method for connecting a heat-adhesive resin sheet, wherein the heat-adhesive resin tape is heat-sealed in a state of being superposed on a connection portion of the heat-adhesive resin sheet.