JP2002160297A - Method for coupling monolayer film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten a strength of a connecting part while maintaining an improvement in a display of a packaging bag to be brought about by a fusing seal substantially as it is, and to improve hermetical sealability and liquid-tight sealability of the connecting part. SOLUTION: The connecting part 3 of the fusing seal of a palms joining state of thermoplastic monolayer films 1 and 2 of a coupling structure of sides or ends of the films 1 and 2 is folded to one side, and further fusion bonded to the film 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interconnecting structure and a connecting method of a thermoplastic stretched or non-stretched monolayer film, and to a connecting strength of a fusing seal joint at a side portion or an end portion of the film. To enhance.

[0002]

2. Description of the Related Art Interconnection of side portions or end portions of a single-layer film made of a thermoplastic resin, particularly an unstretched single-layer film used for a packaging bag, is mostly performed by a heat sealing method. The width of the heat seal joint corresponding to the width of the heat seal blade is selected according to the film material, the filling mass of the packaged object into the manufactured packaging bag, and the like.

[0003] However, the side seal type, the two-side seal type,
For packaging bags made with a sealing method such as a three-way seal type,
In recent years, for example, direct mail, which has a small mass of the packaged item, is required because the heat-seal joint portion protrudes relatively outward from the storage space of the packaged item, and inevitably reduces the appearance of small packaged bags. In such applications, it is widely practiced to reduce the width of the joint of the packaging bag to such a degree that the presence of the packaging bag is hardly conscious by fusing and sealing the transparent single-layer film.
This is remarkable in a stretched single-layer film which is used as a packaging bag and has high transparency and high stiffness, but it is difficult to realize the expected bonding strength and dimensional accuracy by conventional heat sealing.

[0004]

However, the fusing seal joint, which improves the appearance of the packaging bag, has a lower joint tensile strength, airtightness, and liquid tightness than the heat seal joint. In the case of a packaging bag manufactured by fusing and sealing, there is a problem that packaging of a mass-packaged object is practically impossible, and it is difficult to package a liquid material, a granular material, and the like. .

[0005] Therefore, the present invention is to improve the strength of the joint, while substantially improving the appearance of the packaging bag brought about by the fusing seal, and to sufficiently enhance the airtightness and liquid tightness of the joint. Irrespective of whether the packaging bag is large or small, the packaged material having a large mass, and
It is an object of the present invention to provide an interconnecting structure and a connecting method for a single-layer film that enables appropriate and reliable packaging of a liquid material, a powdery granular material, and the like.

Another object of the present invention is to provide a fixed-width agricultural polyethylene film or sheet separate from a packaging bag, a fixed-width plastic film or sheet used for a tunnel or other waterproof soil covering, or the like. It is an object of the present invention to provide an interconnecting structure and a connecting method suitable for use in joining a side portion or front and rear end portions in a sufficiently strong and air-tight and liquid-tight manner.

[0007]

According to the present invention, there is provided a monolayer film interconnecting structure for connecting side portions or end portions of a thermoplastic stretched or non-stretched monolayer film. In this embodiment, the jointed fusing seal joint of the film is further fused to the other surface of the single-layer film in a posture of bending to one side.

Further, in the method for interconnecting single-layer films of the present invention, in realizing the above-mentioned connection structure, the single-layer films are formed with a self-fused fusion joint by fusing and sealing of the single-layer films. Then, the fusion bonding portion is bent to one side, and is fused under pressure to the other surface of one monolayer film.

According to this, the fusion joint in the shape of the palm of the hand formed by the fusing seal is further fused to the single-layer film in its bent position, and the joint is substantially integrated with the single-layer film. By doing so, the connecting portion width of both films is much smaller than that of the heat seal joining, and it is possible to impart high tensile strength to the connecting portion, as well as to secure excellent airtightness and liquid tightness be able to. Here,
In particular, when further fusion of the fusion seal joint is performed by impulse sealing under pressure, when the monolayer film is a uniaxial or biaxially stretched film, the film is rapidly heated and cooled under pressure, In addition to being able to effectively prevent thermal deformation, the bent joint can be fused as expected under a sufficiently high heating temperature.

Thus, according to the present invention, it is possible to properly and surely pack a large mass of a packaged object, a liquid material, a granular material, or the like without the risk of breakage or leakage. Can be bonded sufficiently firmly and air-tightly and liquid-tightly.

[0011]

Embodiments of the present invention will be described below.
The description will be made based on the drawings. FIG. 1 is a cross-sectional view of a principal part schematically showing an embodiment of a connecting structure according to the present invention. In FIG. 1, 1 is one side portion of one single-layer film, and 2 is one side of the single-layer film. The other side part is shown respectively. Here, the single-layer film can be a non-stretched or a uniaxially or biaxially stretched film made of a thermoplastic resin, and more specifically, a nylon film, a polyester film, a polypropylene film, an ethylene
It can be a vinyl alcohol copolymer film, a polyethylene film or the like.

The connecting structure shown in the drawing is, for example, in a state in which one side portion 1 and the other side portion 2 are in a posture facing each other in a palm-shape manner, preferably by pressing both side portions 1 and 2 under pressure. By fusing and sealing to form a fusion joint 3,
The fusion-bonded portion 3 is further fused under pressure to the other surface of the single-layer film, in other words, to the surface opposite to the palm-shaped fusion surface, in a bending posture to one side, This connection structure can be realized by being integrated with a single-layer film. In this connection structure, in particular, it is possible to sufficiently increase the tensile strength of the connection portion by the presence of the bent and fusion-bonded portion 4 and to provide excellent airtightness. And liquid tightness. Therefore, for example, according to a packaging bag made with such a connection structure, an object to be packaged having a large mass can be air-tightly and liquid-tightly packaged under high connection strength.

In such a connection structure, when each of the fusion bonding portion 3 and the bending fusion portion 4 is formed by fusion under pressure using an impulse sealer, heating and cooling are performed. Since each of them can be performed in a very short time, even if the monolayer film is a stretched film, heat shrinkage of the film can be effectively prevented, and at the same time, the heating temperature is sufficient. Under the ascent, each fusion can be reliably performed.

FIG. 2 is a cross-sectional view showing a process of forming the above-described interconnection structure in a case where a rear end portion of one single-layer film is connected to a front end portion of another single-layer film. Here, first, the required lengths of the end portions 11a and 12a of the two single-layer films 11 and 12 are inserted between the bases 21 and 22 as shown in FIG. 2 (a). 2
As shown in (b), while pressing both film end portions 11a and 12a against the sealer 24 with the pusher 23 arranged on the lower side, the sealer 24 is actuated, so that the single-layer films 11 and 12 This results in a fusing seal as shown in FIG. Then, as shown in FIG.
With or without the pusher 23 being retracted, for example, as shown in FIG.
Is pulled up from between the bases 21 and 22 until it is preferably accelerated by the positioning gauge 25 inserted between the end portions 11a and 12a. 3 is positioned exactly corresponding to the upper fusion sealer 26. In this case, the fusion bonding portion 3
Due to the friction with the base 22 due to the pulling up, the film is inevitably delayed, so that the film 11 is bent toward the rear end portion 11a.

Then, after the positioning gauge 25 is pulled out, the pusher 27 disposed on the upper side is advanced and displaced as shown in FIG. 3B, so that the fusion bonding portion 3 and the rear end portion of the film 11 are moved. 11a, and the fusion sealer 26 is acted on to fuse the fusion bonding portion 3 to the other surface side of the single-layer film 11 more sufficiently to form the bending fusion bonding portion 4. Finally, the two-layer films 11 and 12 are brought together as expected, and finally, both end portions 11a and 12a are connected to each other with the pusher 27 retracted and the bent and fused portion 4 is moved to the position shown in FIG. As shown, a series of operations is completed by pulling out from between the bases 21 and 22.

The connecting portion formed as described above can provide the same functions and effects as described above. In the connecting device shown in FIGS. 2 and 3, the pushers 27 and 23 which are separately arranged in the upper and lower portions in the drawing have an integral structure, and each pusher 27 and 23 controls the forward and backward displacement of the pushers 27 and 23. The elastic tube may be a common cylinder or the like.

Incidentally, the front and rear end portions of the biaxially stretched nylon film having a thickness of 15 μm are interconnected as described above, and the tension of the connection portion per 15 mm width is assumed when the width of the bent and fused portion is 300 μm. Strength is 6.0
N, which was 2.0 times as strong as that of the connecting portion consisting only of the fusing seal. In addition, it was confirmed that the connection portion can exhibit high air-tightness and liquid-tightness that can sufficiently withstand the packaging of the liquid material and the granular material.

Incidentally, such a connection structure is used not only for making a bag for packaging but also for connecting side portions or end portions of single-layer films or sheets for other uses such as for agriculture and civil engineering. In this case, in the case of interconnecting the rear end portion of one single-layer film and the front end portion of another single-layer film, the connecting portion, that is, the bending fusion bonding portion 4, As shown in FIG. 4, it may be formed to extend obliquely with respect to the film width direction XX. According to this, with respect to the tensile force acting in the direction in which the films 11 and 12 extend, the tensile force component in the direction orthogonal to the direction in which the bending and fusion bonding portion 4 extends can be effectively reduced.

Although not clear from the drawing, in this connection structure, the fusion bonding portion 3 is bent in a direction opposite to the direction shown in the drawing to form a bending fusion portion 4. Can also.

[0020]

As described above, according to the present invention, particularly, by forming the bent and fused portion, the interconnected portion of the single-layer film is formed into a stretched film if the single-layer film is a non-stretched film. Without exception, high connection strength can be provided, and excellent airtightness and liquid tightness can be imparted.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of a connecting structure according to the present invention.

FIG. 2 is a cross-sectional view illustrating an interconnecting step of a single-layer film.

FIG. 3 is a cross-sectional view illustrating an interconnecting step of a single-layer film.

FIG. 4 is a view exemplifying an extension mode of a bent fusion-bonded portion.

[Explanation of symbols]

 1, 2 side part 3 fusion bonding part 4 bending fusion part 11, 12 monolayer film 11a rear end part 12a front end part

[Procedure amendment]

[Submission date] February 12, 2002 (2002.2.1
2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

[Title of Invention] Consolidated method monolayer film

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Claims: 1. When joining side portions or end portions of a thermoplastic stretched or non-stretched monolayer film, the monolayer films are fused together by fusing and sealing with an impulse sealer. to form the joint, then by bending the fusion junction to one side, in
A method for connecting single-layer films, wherein the single-layer films are fused under pressure by a pulse sealer .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION This invention relates to consolidated stretching method or an unstretched monolayer film of a thermoplastic, the side portion or an end portion of the film, which enhance the connection strength of the fusing seal joint is there.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003] However, the side seal type, the two-side seal type,
For packaging bags made with a sealing method such as a three-way seal type,
In recent years, for example, direct mail, which has a small mass of the packaged item, is required because the heat-seal joint portion protrudes relatively outward from the storage space of the packaged item, and inevitably reduces the appearance of small packaged bags. In such applications, it is widely practiced to reduce the width of the joint of the packaging bag to such a degree that the presence of the packaging bag is hardly conscious by fusing and sealing the transparent single-layer film.
Transparency used as a packaging bag high waist while strong, by conventional general heat seal prominent in stretched monolayer film it is difficult to realize the bonding strength and dimensional accuracy as hereinbefore desired.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005] Therefore, the present invention is to improve the strength of the joint, while substantially improving the appearance of the packaging bag brought about by the fusing seal, and to sufficiently enhance the airtightness and liquid tightness of the joint. Irrespective of whether the packaging bag is large or small, the packaged material having a large mass, and
Liquid material, such as particulate matter, and to provide a consolidated method monolayer film allows a reliable packaging in the proper.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006] It is another object of this invention is independent of the packaging bag, a plastic film or sheet mutual polyethylene film or sheet, fixed width used for tunneling other waterproof Lining etc. for agricultural constant width the side portions or edge portions of the front and rear, to provide a suitable consolidation method used to sufficiently firmly, yet joined hermetically and liquid-tight.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Deleted

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008] of this invention, mutual connection method of the single-layer film, the thermoplastic stretching or unstretched monolayer film, the side
In interconnecting the portions or the end portions, by fusing and sealing the single-layer film by an impulse sealer , a single-layered film-shaped fusion joint is formed between the single-layer films,
Next, the fusion bonding portion is bent to one side, and is fused to another surface of one of the single-layer films under pressure by an impulse sealer.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

[0011]

Figure 1 DETAILED DESCRIPTION OF THE INVENTION, continuous fine granulation of the monolayer film
The is a fragmentary cross-sectional view schematically showing one side portion of one one monolayer film of FIG, 2 shows the other side portion of the single-layer film, respectively. Here, the single-layer film can be a non-stretched or a uniaxially or biaxially stretched film made of a thermoplastic resin, and more specifically,
It can be a nylon film, a polyester film, a polypropylene film, an ethylene / vinyl alcohol copolymer film, a polyethylene film, or the like.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

FIG. 2 is a cross-sectional view showing a process of forming the above-described interconnection structure in a case where a rear end portion of one single-layer film is connected to a front end portion of another single-layer film. Here, first, the required lengths of the end portions 11a and 12a of the two single-layer films 11 and 12 are inserted between the bases 21 and 22 as shown in FIG. 2 (a). 2
As shown in (b), while pressing both film end portions 11a and 12a against the sealer 24 with the pusher 23 arranged on the lower side, the sealer 24 is actuated, so that the single-layer films 11 and 12 This results in a fusing seal as shown in FIG. Then, as shown in FIG.
With or without the pusher 23 being retracted, for example, as shown in FIG.
Is pulled up from between the bases 21 and 22 until it is preferably restrained by the positioning gauge 25 inserted between the end portions 11a and 12a. 3 is positioned exactly corresponding to the upper fusion sealer 26. In this case, the fusion bonding portion 3
Due to the friction with the base 22 due to the pulling up, the film is inevitably delayed, so that the film 11 is bent toward the rear end portion 11a.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65D 33/16 B65D 33/16 4F211 F term (Reference) 2B024 DB01 DD10 2B029 EB02 EB24 EC02 EC03 EC04 RA03 2D055 HA07 3E064 BA26 BA30 BA36 BA54 BC18 EA05 EA07 FA04 FA06 HN05 3E094 AA12 CA01 DA07 DA08 HA08 4F211 AD05 AD08 AH54 TA01 TC10 TC14 TC17 TD12 TN02 TQ06 TQ13

Claims (2)

[Claims] An interconnected structure of a side portion or an end portion of a thermoplastic stretched or non-stretched monolayer film, wherein a jointed fusing seal joint of the monolayer film is folded to one side. An interconnected structure of single-layer films that is further fused to a single-layer film in a bending position. 2. When joining side portions or end portions of a thermoplastic stretched or non-stretched monolayer film, a fusion joint of the monolayer films is formed by fusing seal of the monolayer film. Then, the fusion bonding portion is bent to one side and fused under pressure to the single-layer film.