JP2003112739A - Multi-layered film tube and bag member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light weight and economical tube which has a superior anti-tearing, heat-resistance, anti-spark, moisture-proof, water-proof and air- tightness and which can easily be adjusted to a desired diameter and length. SOLUTION: This multi-layered film tube is constructed such that a multi- layered film sheet 12 is molded into a tubular shape, both side edges of the multi-layered film sheet are overlapped to each other to form an overlapped segment 14 and at the same time the overlapped segment is heat melted. The multi-layered film sheet is made such that a first polyethylene film 16, nylon film 18, aluminum film 20 and second polyethylene film 22 are laminated in sequence. When the sheet is formed into a tubular shape, the first polyethylene film is set inside and the second polyethylene film is set outside to make a tube and at the same time the first polyethylene film at the other side edge is overlapped on the second polyethylene film at one side edge of the multi- layered film sheet to form the overlapped segment. The overlapped segment is connected through a heat melting between the first polyethylene film and the second polyethylene film so as to constitute an integral multi-layered film tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer film tube and bag, and more particularly to tear resistance, heat resistance,
The present invention relates to a multilayer tube and a bag having excellent spark resistance, weather resistance, moisture resistance, water resistance, and airtightness.

[0002]

2. Description of the Related Art A plastic tube formed by molding a plastic sheet into a cylinder is used in various fields. For example, as an exterior material for air-conditioning flexible ducts,
Alternatively, it is used as a bag material when manufacturing a plastic bag. The air-conditioning flexible duct is a pipe that connects a blower and an end blowing device to supply clean air whose temperature and humidity are adjusted to the end blowing device or the like arranged in the room. Flexible ducts for air conditioning are generally wound around a spiral steel wire with a heat insulating material such as low density glass wool to form a heat insulating cylinder.
It is formed by covering the outer peripheral surface with a plastic tube such as a polyvinyl chloride tube. Further, the plastic bag body is often used as a bag for containing various granular bodies or powders, and is often made of a vinyl chloride resin film, a polyethylene resin film or the like.

[0003]

However, the conventional plastic tube has the following problems. First
In the conventional plastic tube, a single-layer plastic film such as a vinyl chloride resin film or a polyethylene resin film is formed into a tubular shape, or a multi-layer film sheet obtained by laminating these single-layer plastic films is used. There is a problem that the heat resistance is low because it is made into a tubular shape.

Secondly, when a vinyl chloride resin film is used for the tube body, when incinerated,
There was a problem that dioxins were generated. Third, there is a problem that the plastic tube has low spark resistance. That is, in piping work for laying a flexible duct for air conditioning, welding work is often performed in order to weld a support material or the like for supporting the flexible duct for air conditioning, and at that time, a spark or the like occurs. Conventional plastic
When the tube is used as an exterior material, there is a problem that when a spark or the like adheres to the plastic tube, a hole is easily opened in the plastic tube. That is, the conventional plastic tube lacks spark resistance as an exterior material.

Therefore, an object of the present invention is to provide tear resistance,
An object of the present invention is to provide a tube which is excellent in heat resistance, spark resistance, moisture resistance, water resistance, and airtightness, whose diameter and length can be easily adjusted, and which is lightweight and economical. Incidentally, a tubular coating body in which a rectangular multilayer film sheet made of an aluminum laminated film is rolled into a circle and the abutting portions are bonded with an aluminum tape is proposed as a multilayer film tube. However, the aluminum tape is not a general-purpose product on the market but rather a custom-made product, and there is a problem that the cost increases.

[0006]

The present inventor has made a single-layer tube which is excellent in tear resistance, heat resistance, spark resistance, weather resistance, moisture resistance, water resistance, and airtightness, and which is lightweight. I thought it would be difficult to make it with this film. It is difficult to find a monolayer film that has all of these properties. Therefore, it was considered to manufacture a multi-layered film tube from a multi-layered film sheet obtained by laminating a plurality of films, each film having at least one of the properties required for the tube.

The present inventor first employs a multilayer film sheet in which a polyethylene film, an aluminum film, and a polyethylene terephthalate (PET) film are sequentially laminated as a material for the multilayer film tube,
With the polyethylene film inside, both side edges of the multilayer sheet are abutted into a tube shape, and the polyethylene film at the abutted portion is heat-bonded with a laminated tape of nylon and polyethylene to join the multilayer tube. Developed as a development product. Polyethylene terephthalate film and polyethylene film are reinforcing materials for aluminum films, and mainly satisfy the tear resistance and water resistance among the properties required for a multilayer film tube, and are a multilayer film sheet. Was used to facilitate processing into a tube.

However, in the butt-joining in which both side edges of the multilayer film sheet are abutted and the nylon tape is heat-sealed on the abutted portion, the seal strength is practically a film thickness although it depends on the film thickness of each film. Was difficult to increase to 40 N / cm or more. In butt joining, it is necessary to butt both side edges and heat-bond a laminated tape of nylon and polyethylene on it.
It was necessary to perform positioning twice, and it was difficult to improve the productivity of the joining process.

Therefore, the present inventor further advanced the research,
Instead of butt joining, one side edge portion of the multilayer film sheet is overlaid with the other side edge portion of the multilayer film sheet to form an overlapped portion, and the overlapped portion is heat-sealed by lap joining. The idea was to make a multilayer tube, and this was made into the second development product. As a result of various experiments, it was found that the second developed product of the lap joint has higher sealing strength and joint strength than the first developed product of the butt joint and can be economically joined. . Then, in order to be suitable for lap joining, we developed a multilayer film sheet in which a first polyethylene film, a nylon film, an aluminum film, and a second polyethylene film are sequentially laminated, and a second developed product The present invention was invented at the end of the experiment, using the above-mentioned multilayer tube as a material.

In order to achieve the above object, based on the above findings, the multilayer tube according to the present invention comprises a first polyethylene film, a nylon film, an aluminum film, and a second polyethylene film. The multilayer film sheets that are sequentially laminated are
The film is tubular, with the film inside, and a second polyethylene film on one side edge of the multilayer sheet on which the first side of the other side edge of the other side of the multilayer sheet is opposed. It is characterized in that the polyethylene film is laminated and laminated to form a laminated portion, and the laminated portion is heat-sealed.

In the multilayer tube according to the present invention, the aluminum film is mainly used for satisfying heat resistance, spark resistance and airtightness among the properties required for the multilayer tube. Nylon film is a film made of nylon (trade name of duPont) and has excellent tear resistance, heat resistance, abrasion resistance, toughness, etc., and is used as a reinforcing material for aluminum films and required for multilayer tubes. Of these properties, it is mainly used for satisfying tear resistance, weather resistance, and impact resistance, and for enhancing airtightness.

The first polyethylene film and the second polyethylene film are low-density polyethylene, which are used to enhance the moisture resistance and water resistance of the multilayer tube, and to heat the multilayer sheet. It is used for imparting fusion property. That is, the multi-layer film sheet used in the multi-layer film tube according to the present invention uses the first and second polyethylene films for the back layer and the front layer, respectively, so that the second side film on one side edge of the multi-layer film sheet is The first polyethylene film on the other side edge of the multilayer sheet can be overlaid and heat-sealed onto the polyethylene film.

The thickness of each film constituting the multilayer tube according to the present invention varies depending on the dimensions, application, required strength, necessity of flexibility or rigidity of the multilayer tube, but the film of aluminum film. The thickness is in the range 5 μm to 30 μm, for example 7 μm, and the thickness of the nylon film is 13 μm to 25 μm, for example 15 μm. The thickness of each of the first polyethylene film and the second polyethylene film is 2
0 μm to 40 μm, for example, the first polyethylene film has a thickness of 30 μm and the second polyethylene film has a thickness of 30 μm.
The film thickness is 30 μm. The thickness of the multilayer film sheet is in the range of 50 μm or more and 100 μm or less.
If it is less than 50 μm, the tear resistance, tensile strength and impact strength are low, and if it exceeds 100 μm, the flexibility is lowered and it is difficult to mold it into a tubular shape.

In the present invention, by using the above-mentioned multilayer film sheet as a material for the multilayer film tube, the multilayer film tube has tear resistance, heat resistance, spark resistance, moisture resistance, water resistance and airtightness. It is possible to produce a lightweight and economical multilayer tube which is excellent and has high strength when the multilayer tube is pulled from both sides, that is, high sealing strength and tensile strength.

The inner diameter of the multi-layer tube according to the present invention is not limited, but usually 50 mm to 700 mm.
Is.

Further, the above-mentioned multilayer tube is cut into a predetermined length, and the first polyethylene films inside the cut multilayer tube are heat-sealed to each other, whereby tear resistance, spark resistance, and weather resistance are obtained. It is possible to produce a bag body according to the present invention which is excellent in heat resistance, heat resistance, moisture resistance, water resistance, and airtightness, and is lightweight and economical.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described specifically and in detail with reference to the accompanying drawings. Example of Embodiment of Multilayer Membrane Tube This example of the embodiment is an example of the embodiment of the multilayer membrane tube according to the present invention, and FIG. 1A is a perspective view showing the configuration of the multilayer membrane tube of the embodiment. 1 (b) is shown in FIG. 1 (a).
11 is a cross-sectional view taken along line II ′ of FIG. The multilayer tube 10 of the present embodiment is a flexible tube body having an inner diameter of 100 mm, and as shown in FIG. 1, the multilayer sheet 12 is formed into a tube shape, and both side edges of the multilayer sheet 12 are formed. The multilayer film tube is produced by forming the overlapping portion 14 by superimposing and then heat-sealing the overlapping portion 14.

As shown in FIG. 2 (a), the multilayer film sheet 12 comprises a first polyethylene film 16, a nylon film 18, an aluminum film 20, and a second polyethylene film 22 in this order. It is a laminated multilayer film sheet. When forming a tube, place the first polyethylene film 16 inside and the second polyethylene film 16.
The multilayer sheet 12 is formed into a tube shape with the film 22 on the outer side, and the first polyethylene film 16 on the other side edge is placed on the second polyethylene film 22 on one side edge of the multilayer sheet 12. Are overlapped with each other to form an overlapping portion 14. By heat-sealing the first polyethylene film 16 and the second polyethylene film 22 of the overlapping portion 14, the multilayer tube 10 is configured as an integral multilayer tube.

The aluminum film 20 is heat resistant,
With spark resistance, moisture resistance, water resistance, and airtightness,
That property can be imparted to the multilayer tube 10. Nylon film 18 has excellent tear resistance, heat resistance, wear resistance, toughness, etc., and is used as a reinforcing material for aluminum film 20. Among the properties required for a multilayer tube, tear resistance is mainly , Is used for satisfying weather resistance and enhancing impact resistance. The first polyethylene film 16 and the second polyethylene film 22 are used to increase the moisture resistance and water resistance of the multilayer tube 10, and
It is used for imparting heat fusion property to the multilayer film sheet 12. The respective films of the multilayer film sheet 12 are laminated by adhering the films to each other with an adhesive agent such as urethane resin.

The thickness of the first polyethylene film 16 is 30 μm, and the thickness of the nylon film 18 is 15 μm.
m, the thickness of the aluminum film 20 is 7 μm, and the thickness of the second polyethylene film 22 is 30 μm. First polyethylene film 16, nylon
Film 18, aluminum film 20, and second
The total thickness of the polyethylene film 22 is 82μ.
m, which is within the preferable range described above.

With the above structure, the multilayer tube 10 of this embodiment has a tear resistance, a spark resistance, a weather resistance,
It is excellent in heat resistance, moisture resistance, water resistance, and airtightness, and has high strength when pulled from both sides, that is, seal strength and tensile strength, and is a more economical multilayer membrane tube than conventional tubes. Can be evaluated.

Next, with reference to FIG. 2, a method of manufacturing the multilayer tube 10 of this embodiment will be described. FIG. 2A and FIG. 2B are schematic diagrams each illustrating a process of manufacturing the multilayer tube 10 of the present embodiment example. First, as shown in FIG. 2A, the first polyethylene film 16, nylon film 18, aluminum
Film 20 and second polyethylene film 22
Are sequentially laminated to produce a multilayer film sheet 12. The films are bonded together using a urethane adhesive or the like. Then, it is wound into a roll to form a roll 24.

Next, as shown in FIG. 2B, the multi-layer film sheet 12 is fed from the roll 24, and the guide roller 2
It is conveyed to the multi-layered film tube forming device while being guided via 6, etc. In the multilayer tube forming apparatus, first, both side surfaces of the multilayer sheet 12 are folded inward by the bi-fold guide 28 while the other side of the side edge portion 12a of the multilayer sheet 12 is placed on the second polyethylene film 22 and the other side. Side edge 1
The first polyethylene film 16 of 2b is overlaid, and while forming the overlaid portion 14, it is formed into a tube shape or an envelope shape so as to wrap around the template 30, and is a bag-like body formed of the double-layered multilayer film sheet 12 32 is produced. Then, the heating element 34 is pressed onto the overlapping portion 14 to heat-bond the first polyethylene film 16 and the second polyethylene film 22 of the overlapping portion 14 to each other to produce the multilayer tube 10. Meanwhile, the multilayer tube 10 is wound up on the roll 36.

When the both side edges of the multilayer sheet 12 are overlapped, the side edges of either side may be brought up because the multilayer sheet 12 is manufactured uniformly. Further, it is basically to heat-bond over the entire width of the overlapping portion 14, but as long as sufficient adhesive strength is obtained, part of the overlapping portion 14 in the width direction may be heat-bonded.

In order to evaluate the multilayer tube 10 of this embodiment, the seal strength was measured based on the measuring method of JIS Z 1707, and the results shown in Table 1 were obtained. The seal strength is the tensile breaking strength of the heat-sealed portion of the overlapping portion 14. The seal strength was measured 3 times.

[Table 1]

Further, the multilayer film tube 10 of the present embodiment example.
For comparison, the first developed multilayer tube was prototyped as a comparative example, and the sealing strength was measured in the same manner as the multilayer tube 10 of the embodiment. The results are shown in Table 1.
As shown in. The multilayer tube 40 of the comparative example has the same inner diameter of 100 mm as the multilayer tube 10 of the present embodiment.
3A and 3B, the polyethylene film 41 and the aluminum film
Film 42 and polyethylene terephthalate (PE
T) A multilayer film sheet in which a film 43 is sequentially laminated is used as a material. The multilayer tube 40 is made of polyethylene
A tube body 44 in which both side edges of the multilayer film sheet are butted against each other with the film 41 inside, and a laminated tape 45 of nylon and polyethylene heat-sealed to the polyethylene film 41 at the butted portion 44a of the tube body 44. The laminated tape 45 of nylon and polyethylene is heat-sealed to the abutting portion 44a of the tube body 44 to form an integral multi-layer film tube.

Polyethylene film 41, aluminum film 42, and polyethylene terephthalate
The film thicknesses of the film 43 are 30 μm and 12 μm, respectively.
m and 12 μm. The width W of the nylon tape 45 is 12 to 22 mm. Polyethylene film 4
1, the aluminum film 42, and the polyethylene terephthalate film 43 are laminated by adhering the films to each other with an adhesive such as a urethane adhesive.

As can be seen from Table 1, the multilayer tube 10 of the present embodiment has a sealing strength which is about 60% higher than that of the multilayer tube 30 of the comparative example. That is, since the multilayer tube 10 of the present embodiment has a remarkably high mechanical strength, its application is extremely wide. As can be seen from the above description, the multilayer tube 10 of the present embodiment is excellent in tear resistance, spark resistance, weather resistance, heat resistance, moisture resistance, water resistance, and airtightness, and is a multilayer tube and bag. The strength when the body is pulled from both sides, that is, the sealing strength and the tensile strength are high, the weight is light, and the tube processing is easy, so it can be evaluated as an economical tube.

Embodiment Example of Bag Body This embodiment example is an example of an embodiment of the bag body according to the present invention, and FIG. 4 is a perspective view showing the configuration of the bag body of this embodiment example. The bag body 50 of the present embodiment example cuts the multilayer film tube 10 of the embodiment example into a predetermined length, and cuts the first polyethylene films 16 inside the one cut portion 51 of the cut multilayer film tube 10. It is a bag body that is heat-sealed. With the above configuration, the bag body 50 of the present embodiment is
Made of bag material with excellent tear resistance, spark resistance, weather resistance, heat resistance, moisture resistance, water resistance, and airtightness, and the strength when the bag body is pulled from both sides, that is, seal strength and tensile strength It can be evaluated as a bag that has high strength, is lightweight, and is economical.

[0030]

According to the present invention, a multilayer film sheet obtained by sequentially laminating specific films is formed into a tube with the first polyethylene film inside, and one side edge of the multilayer film sheet is provided. The second polyethylene film on the other side, the first polyethylene film on the other side edge portion of the multilayer film sheet is overlapped and formed to form an overlapped portion, and the overlapped portion is heat-sealed to form a multilayer. A membrane tube is made, and a bag is made of such a multilayer membrane tube. Thereby, tear resistance, spark resistance, weather resistance, heat resistance, moisture resistance, water resistance, and excellent in airtightness, moreover, strength when the multilayer tube and bag are pulled from both sides,
In other words, it realizes a lightweight and economical multilayer tube and bag having high sealing strength and tensile strength.

[Brief description of drawings]

1A is a perspective view showing the configuration of a multilayer tube of an embodiment, and FIG. 1B is a line I- of FIG. 1A.
It is sectional drawing in I '.

2 (a) and 2 (b) are schematic diagrams each illustrating a process for producing the multilayer tube of the embodiment.

3 (a) is a perspective view showing the structure of a multilayer tube of a comparative example, and FIG. 3 (b) is a line II-II 'of FIG. 3 (a).
FIG.

FIG. 4 is a perspective view showing a configuration of a bag body according to an embodiment.

[Explanation of symbols]

10 Multi-Layered Tube of Example Embodiment 12 Multi-Layered Sheet 14 Laminated Section 16 First Polyethylene Film 18 Nylon Film 20 Aluminum Film 22 Second Polyethylene Film 24 Roll 26 Guide Roller 28 Folding Guide 30 Template 32 bag-like body 34 heating element 36 roll 40 multilayer film tube 41 of comparative example polyethylene film 42 aluminum film 43 polyethylene terephthalate (PET) film 44 tube body 44a butt portion 45 laminated tape of nylon and polyethylene 50 of the embodiment Bag 51 Cutting part

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // B31B 1/14 321 B31B 1/14 321 1/40 321 1/40 321 1/64 321 1/64 321 23/14 23/14 23/40 23/40 23/64 23/64 F term (reference) 3E064 AA06 BA17 BA26 BA36 BB03 BC01 BC04 BC15 BC20 EA30 GA06 HM01 HN05 3E075 AA28 BA42 CA02 DC15 DC44 DD13 DD45 GA04 3E086 AD01 BA04 BA13 BA15 BB41 BB71 BB75 BB90 4F100 AB10C AK04A AK04D AK48B BA04 BA07 BA10A BA10D DA02 DB01 EC022 EC03 EC18 EC181 EJ28 EJ282 EJ30 EJ302 GB16 JB05 JB07 JJ03 JK03 JL09

Claims (2)

[Claims] 1. A tube comprising a multilayer film sheet obtained by sequentially laminating a first polyethylene film, a nylon film, an aluminum film, and a second polyethylene film, with the first polyethylene film inside. A second polyethylene film on one side edge portion of the multilayer film sheet and a first polyethylene film on the other side edge portion facing the one side edge portion of the multilayer film sheet.
A multi-layer film tube, characterized in that the films are overlapped to form an overlapped part and the overlapped part is heat-sealed. 2. The multilayer tube according to claim 1 is cut into a predetermined length, and the first polyethylene films inside one cut portion of the cut multilayer tube are heat-sealed. A bag characterized by.