JPH10202747A - Pipe lining material and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe lining material having all the required properties and a method for manufacturing the pipe. SOLUTION: A pipe lining material 1 is constituted by a method in which the outer surface of a tubular resin absorbing material 2 is coated with a plastic film and the material 2 is impregnated with a curable resin. The film is constituted from a tubular multilayer composite film 3 having 5-layered structure of a surface film layer 3-1/a heat reactive adhesive film layer 3-2/an intermediate film layer 3-3/a heat reactive adhesive film layer 3-4/a melt bonding film layer 3-5. Since the film 3 constitutes the 5-layered structure in which the layer 3-3 is placed between the layer 3-1 and the layer 3-5 which are bonded and integrated by the layers 3-2, 3-4, respectively, the material 1 having all the required properties can be obtained by allotting a portion of the properties to each layer 3-1-3-5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe lining material mainly used for repairing a pipeline and a method for producing the same.

[0002]

2. Description of the Related Art When a pipeline such as a sewer pipe buried underground is deteriorated, a pipe lining for repairing the pipeline by lining the inner peripheral surface thereof without excavating the pipeline. A construction method has been proposed and is already in practical use. This pipe lining method is to insert a pipe lining material made by impregnating a curable resin into a tubular resin absorbent material whose outer surface is covered with a highly airtight plastic film, while turning it into the pipe line while turning it over by fluid pressure. The pipe lining material is pressed against the inner peripheral surface of the pipe line, and while maintaining the state, the pipe lining material is heated or the like to cure the curable resin impregnated in the pipe lining material, and the cured pipe lining material is cured. This method repairs the pipeline by lining the inner peripheral surface of the pipeline.

As a method of manufacturing a pipe lining material used in such a pipe lining method, an outer surface of a resin absorbent obtained by processing a nonwoven fabric into a tube is covered with a plastic film, and the resin absorbent is evacuated. There has been proposed a method in which a plastic film is brought into close contact with this, and the plastic film is heated in that state and welded to the outer surface of the resin absorbent (see JP-A-4-59227).

Incidentally, in order to prevent the burst of the pipe lining material during the lining work and to prevent the peeling of the plastic film of the pipe lining material after the lining work, the plastic film needs to be strongly welded to the resin absorbent material. . In particular, even during cleaning work performed as pipe maintenance after lining construction,
The plastic film of the pipe lining material needs to have a sufficient adhesive strength so that it does not peel off even with high-pressure jet water.

[0005]

However, in the conventional method of manufacturing the pipe lining material, the plastic film softened by heat is only pressed to the thread on the outer surface of the nonwoven resin absorbent material. There is a problem that the adhesive strength to the resin absorbent is not sufficient.

[0006] Therefore, it is possible to increase the decompression force of the resin absorbent,
A method of increasing the degree of softening of the plastic film has been considered.

However, since the surface of the non-woven fabric constituting the resin absorbent has a non-uniformly breathable needle-hole-shaped eye, when the decompression force of the resin absorbent is increased, the plastic film is formed of the resin absorbent. The surface of the plastic film bites too much, resulting in pinholes in the plastic film.

In addition, when welding a plastic film, the plastic film is heated from the outside, and when the inside of the plastic film is heated to near its melting point in a method of increasing the softening degree of the plastic film, the surface of the plastic film is already melted. Therefore, pinholes are generated in the plastic film.

Therefore, a three-layer structure of a low melting point film layer (or adhesive film) 103-1 / high melting point film layer 103-2 / low melting point film layer (or adhesive film) 103-3 as shown in FIG. Multilayer composite film 1 having
A method of welding 03 to the outer surface of the resin absorbent 102 was considered. According to this method, the low melting point film layer (or adhesive film layer) 103-
1 to melt the multilayer composite film 103 into the resin absorbent 1
02 can be welded with sufficient adhesive strength.

However, the high melting point film layer 103-
2 and the low-melting film layers 103-1 and 103-3 are composed of different types of films,
03-2 and the low-melting film layers 103-1 and 103-3 are weak in laminating strength. Melting point film layer 103-
There is a problem that partial peeling occurs between the first and the third 103-3.

When the multi-layer composite film 103 having a three-layer structure is formed by laminating and bonding the adhesive films 103-1 and 103-3 on both sides of the high melting point film 103-2, Film 103
-1 and 103-3, the problem of peeling of the high melting point film 103-2 and the adhesive films 103-1 and 103-3 did not occur at the time of lining work, but is shown below. Such a problem occurred.

That is, the adhesive films 103-1 and 103
-3 is inferior in other functions due to the emphasis on adhesive strength, and in particular, it has a large dynamic friction coefficient, which makes it difficult to reverse the pipe lining material at the time of lining construction. When the tubular resin absorbent is inserted into the plastic film, there is a problem that the insertion resistance is large and the plastic film is cut.

Further, the adhesive films 103-1 and 103-
No. 3 is also strongly welded to the resin absorbent 102, but has low strength of itself, and many of them have a problem that they are easily attacked by hot water or steam at the time of lining construction because of their large water absorption.

Further, many of the high melting point films 103-2 have excellent gas barrier properties, but are inferior in steam barrier properties. Therefore, when steam is used as a heat medium for curing a curable resin, the adhesive film 103-2 is used. -1,103-
There is a problem that steam infiltrates into the resin absorbing material 102 through 3 and the curing of the curable resin is inhibited by the steam.

Therefore, when the thickness of the multilayer composite film 103 is increased in order to increase the welding force and the fluid barrier property of the multilayer composite film 103 and to prevent the generation of pinholes, the expensive adhesive films 103-1 and 103-3 become expensive. Since a large amount is required, there is a problem that the cost of the pipe lining material 101 is increased.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a pipe lining material satisfying all required characteristics and a method for manufacturing the same.

[0017]

In order to achieve the above object, according to the first aspect of the present invention, an outer surface of a tubular resin absorbent material is covered with a plastic film, and the resin absorbent material is impregnated with a curable resin. A tube-shaped multi-layer composite having a five-layer structure of a surface film layer / a heat-reactive adhesive film layer / an intermediate film layer / a heat-reactive adhesive film layer / a fusion bonding film layer. It is characterized by comprising a film.

According to a second aspect of the present invention, in the first aspect of the present invention, the surface film layer is made of low melting point polyethylene, polypropylene or a copolymer thereof or high melting point nylon, The film layer is composed of a medium or low melting point admer, EAA or ionomer, and the intermediate film layer is formed of a high melting point nylon, EV
OH or polyester, and the melt-bonded film layer is made of low-melting polyethylene, polypropylene or a copolymer thereof.

According to a third aspect of the present invention, in the first or second aspect of the invention, the multilayer composite film is formed into a seamless tube by a co-extrusion blown method.

According to a fourth aspect of the present invention, in the first, second or third aspect, the material of the surface film layer and the material of the fusion bonding film layer and the material of the both heat-reactive adhesive film layers are the same. It is characterized in that the multilayer composite film is composed of three kinds of materials.

The invention according to claim 5 is characterized in that the surface film layer /
A tubular resin absorbent is passed through the inside of a tubular multi-layer composite film having a five-layer structure of a heat-reactive adhesive film layer / intermediate film layer / heat-reactive adhesive film layer / melt-bonded film layer, and the resin absorbent is The multilayer composite film is brought into close contact with the outer surface of the resin by vacuum evacuation, and while maintaining the state, the multilayer composite film is heated and welded to the outer surface of the resin absorbent material to be integrated with the resin absorbent material. It is characterized by being impregnated with a resin.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, a highly airtight pressurized tube is inserted inside the resin absorbing material, and the pressurized tube is expanded by fluid pressure to form the multilayer. It is characterized in that the composite film and the resin absorbing material are spread out in a tubular shape, and the resin absorbing material is evacuated to make the multilayer composite film adhere to the outer surface thereof.

According to a seventh aspect of the present invention, in the fifth or sixth aspect, the heating of the multilayer composite film is performed by moving a heating device relative to the multilayer composite film. The resin absorbing material is sequentially welded in a length direction from one end to the other end.

According to an eighth aspect of the present invention, there is provided the heat-reactive adhesive film according to the fifth, sixth or seventh aspect, wherein the surface film layer is made of low melting point polyethylene, polypropylene or a copolymer thereof. The intermediate film layer is composed of a high melting point nylon, EVOH or polyester, and the fusion bonding film layer is composed of a low melting point polyethylene, polypropylene or each of them. It is characterized by comprising a polymer.

The ninth aspect of the present invention is the fifth aspect of the present invention.
Alternatively, in the invention described in Item 8, the multilayer composite film is formed into a seamless tube by a co-extrusion inflation method.

The invention according to claim 10 is the invention according to claims 5, 6,
In the invention described in 7, 8, or 9, the material of the surface film layer and the material of the fusion bonding film layer and the material of both heat-reactive adhesive film layers are the same, and the multilayer composite film is formed of three kinds of materials. Features.

Therefore, according to the present invention, the multi-layer composite film has a five-layer structure in which the intermediate film layer is interposed and the surface film layer and the fusion bonding film layer are bonded and integrated on both surfaces by the heat-reactive adhesive film layer. By constituting, the pipe lining material satisfying all the characteristics can be obtained by sharing the required characteristics to each film layer.

[0028]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partial perspective view of a pipe lining material according to the present invention, and FIG. 2 is an enlarged partial sectional view showing the structure of the pipe lining material.

As shown in FIG. 1, a pipe lining material 1 according to the present invention covers an outer surface of a tubular resin absorbent material 2 with a multi-layer composite film 3 and heats the resin absorbent material 2 such as an unsaturated polyester. It is configured to be impregnated with a curable resin. Here, the resin absorbent 2 is made of a non-melting nonwoven fabric made of a simple substance such as polyester, acrylic, nylon, glass, carbon, ceramic, or a mixture thereof.

The resin absorbent 2 may be impregnated with another curable resin such as a photo-curable resin or a room-temperature curable resin instead of the thermosetting resin.

As shown in FIG. 2, the multilayer composite film 3 has a surface film layer 3-1, a heat-reactive adhesive film layer 3-2, an intermediate film layer 3-3, and a heat-reactive adhesive film layer 3. -4 / melt-bonded film layer 3-5, and has a laminated structure of five layers, which are formed into a seamless tube by a co-extrusion inflation method. That is, this tubular multilayer composite film 3
A heat-reactive adhesive film layer 3-2 and a surface film layer 3-1 on both surfaces (an outer peripheral surface and an inner peripheral surface) of the intermediate film layer 3-3. -4 to form a laminated structure of five layers. In the process of manufacturing the pipe lining material 1, the multilayer composite film 3 is heated by the resin absorbent material 2 as described later.
When being welded to the outer surface of the resin absorbing material 2, the innermost fusion bonding film layer 3-5 melts and melts into the outer surface of the resin absorbent material 2 (see FIG. 2).

Thus, 1) the coefficient of kinetic friction is small with respect to the surface film layer 3-1. 2) High water resistance. 3) High steam barrier properties. 4) Good heat welding property. 5) High pinhole resistance. 6) High styrene resistance. 7) High embrittlement resistance. 8) Inexpensive. Etc. are required, and the surface film layer 3 satisfying these characteristics is required.
As -1, a film having a thickness of 10 to 100 μm made of low melting point polyethylene (LDPE), polypropylene (PP) or a copolymer thereof, or a film having a thickness of 5 to 100 μm made of high melting point nylon is used.

The heat-reactive adhesive film layer 3-2,
3-4: 1) High adhesion to different types of films and nonwoven fabrics. 2) High styrene resistance. 3) High embrittlement resistance. Are required, and the thickness of the heat-reactive adhesive film layers 3-2 and 3-4 satisfying these characteristics is 5 to 30 μm made of a medium- or low-melting admer, EAA or ionomer.
Is used.

Here, Admer (trade name) is an adhesive resin in which a special functional group is introduced into polyolefin, EAA is an ethylene / acrylic acid copolymer resin, and ionomer is an ethylene / methacrylic acid copolymer resin. Since the adhesiveness to the film is high, the intermediate film layer 3-3
The surface film layer 3-1 made of a heterogeneous film and the fusion-bonded film layer 3-5 are firmly joined and integrated on both surfaces.

Further, with respect to the intermediate film layer 3-3: 1) High gas barrier properties. 2) High melting point. 3) High pinhole resistance. 4) High styrene resistance. 5) High embrittlement resistance. Etc. are required, and the intermediate film layer 3 satisfying these characteristics is required.
-3, made of high melting point nylon, ethylene vinyl alcohol (EVOH) or polyester and having a thickness of 5 to 50
A μm film is used.

Further, for the fusion-bonded film layer 3-5: 1) The dynamic friction coefficient is small. 2) High fluidity during thermal welding. 3) High styrene resistance. 4) Having a stable strength. 5) High embrittlement resistance. 6) Inexpensive. And the like, and a low-melting polyethylene (PE), polypropylene (PP), or a film of each copolymer having a thickness of 10 to 100 μm is used as the fusion bonding film layer 3-5 satisfying these characteristics.

Thus, the above surface film layer 3-1 / heat-reactive adhesive film layer 3-2 / intermediate film layer 3-3 /
Heat-reactive adhesive film layer 3-4 / fusion bonding film layer 3
By combining the materials of the films constituting -5, for example, six types of multilayer structure films (1) to (6) as shown in the following table can be obtained.

[0039]

In Table 1, LDPE is low density polyethylene, and HDPE is high density polyethylene.

The multilayer composite film (6) in Table 1
All other multi-layer composite films (1) to (7) except (7)
In (5), the materials of the surface film layer 3-1 and the fusion bonding film layer 3-5 and the heat-reactive adhesive film layer 3-3
-2, 3-4 are made of the same material, and each of the multilayer composite films (1) to (5) is composed of three types of materials. Therefore, the manufacturing cost of each of the multilayer composite films (1) to (5) Can be kept low.

Next, a method of manufacturing the pipe lining material 1 having the above configuration will be described with reference to FIGS. still,
3 to 6 are explanatory views showing the manufacturing method according to the present invention in the order of steps, and FIG. 7 is a cross-sectional view showing the detailed structure of the multilayer composite film layer 3, the resin absorbent 2, and the pressure tube 4 in the state shown in FIG. FIG. 8 is a cross-sectional view showing the evacuation of the resin absorbent 2.

In the manufacturing method according to the present invention, first,
As shown in FIG. 3, the widthwise end portions of the resin absorbent material 2 'cut in a band shape are overlapped with each other, and the overlapped portion is sewn with a sewing machine (lock stitching). 4 to obtain a tubular resin absorbent material 2 whose both ends in the width direction are butted as shown in FIG.

As a method of forming the tubular resin absorbent material 2, in addition to the lock stitching described above, a straight stitching, a punching process with a needle, welding, bonding with an adhesive, or the like, is used to form a butt portion of the band-shaped resin absorbent material 2 '. Can be adopted.

Next, as shown in FIG. 5, the tubular resin absorbent 2 is passed through the tubular multilayer composite film 3, and a highly airtight pressure tube 4 is placed inside the resin absorbent 2. insert. The detailed structure of the multilayer composite film 3, the resin absorbent 2, and the pressure tube 4 in this state is shown in FIG.

Since the melt-bonded film layer 3-5 constituting the innermost layer of the multilayer composite film 3 is formed of a film having a small dynamic friction coefficient, when the resin absorbent 2 is passed through the multilayer composite film 3, No large frictional resistance is generated between the two, and the resin absorbent 2 is smoothly inserted into the multilayer composite film 3 without resistance.

By the way, as shown in FIGS. 9 and 10,
If a thin band-shaped nonwoven fabric 2a is adhered to the outer periphery of the resin absorbent material 2 along a seam portion thereof with a thermal adhesive so as to cover the seam, the seam is turned over after the pipe lining material 1 is inverted and cured. This is convenient because it does not appear on the inner peripheral surface of the material 1). As the thermal adhesive, a polyethylene or nylon-based material having good air permeability is used.

As shown in FIG. 5, the pressure tube 4 is sealed by closing both ends of the pressure tube 4, and as shown in FIG. When compressed air is supplied to the inside, the pressurized tube 4 expands under the pressure of the compressed air, and expands the resin absorbent 2 and the multilayer composite film 3 into a tubular shape.

Then, while maintaining the above state, as shown in FIGS. 6 and 8, when the resin absorbent 2 is evacuated using the vacuum pump 7 and the vacuum hose 8, the resin absorbent 2 The located multilayer composite film 3 is attracted by the negative pressure generated in the resin absorbent 1 and adheres to the outer surface of the resin absorbent 2. At this time, since the surface film layer 3-1 constituting the outermost layer of the multilayer composite film 3 has high pinhole resistance, even if the resin absorbent 2 is evacuated as described above, the surface film Pinholes do not easily occur in the layer 3-1. Even if a pinhole is generated in the surface film layer 3-1, since the surface film layer 3-1 is formed of a low melting point film having a high heat-welding property, the surface film layer 3-1 is heated by a welding step described later. The surface film layer 3-1 is melted, and the pinholes generated in the surface film layer 3-1 are filled and disappear. In FIG. 8, reference numeral 9 denotes a vacuum pad.

Thereafter, as shown in FIG. 6, the resin absorbing material 2 is passed through the cylindrical heating device 10 together with the multilayer composite film 3 and the pressurizing tube 4, and while the heating device 10 is being driven, the pulling rope 11 By moving the resin absorbent material 2 from one end to the other end in the direction of the arrow shown in FIG.
Is heated by the heating device 10 and welded one after another to the outer peripheral surface of the resin absorbent 2, and the outer surface of the resin absorbent 2 is covered with the multilayer composite film 3. In addition, the heating device 10
A plurality of linear electric heaters 1 which are attached to the inner peripheral surface of a cylindrical tubular body 12 having a diameter sufficiently larger than the resin absorbent 2 so as to be inclined.
3 and a power supply 1
When electricity is supplied from 4, the electric heater 13 generates heat and the multilayer composite film 3 is heated as described above.

As described above, since the multilayer composite film 3 has the intermediate film layer 3-3 made of a high melting point film in the middle as described above, the intermediate film layer 3-3 is melted by heating. This intermediate film layer 3-3 and the heat-reactive adhesive film layer 3-4 inside the intermediate film layer 3-3
, Sufficient heat is transmitted from the heating device 10 to the melt-bonded film layer 3-5. In this case, since the melt-bonded film layer 3-5 is formed of a low-melting film having high fluidity at the time of heat welding, it melts well into the nonwoven fabric on the outer surface of the resin absorbent material 2 in a molten state (see FIG. ), The multilayer composite film 3 is firmly bonded to the outer surface of the resin absorbent 2.
In addition, since the film constituting the melt-bonded film layer 3-5 is inexpensive, the multilayer composite film 3 is
Even if the thickness of the fusion bonding film layer 3-5 is increased in order to cause the outer surface to be more strongly welded, no significant cost increase is caused.

As described above, the resin absorbent 2 whose outer surface is covered with the multilayer composite film 3 is impregnated with an uncured thermosetting resin such as unsaturated polyester, and finally, as shown in FIG. 1 is obtained.

Next, another method of manufacturing the pipe lining material 1 will be described with reference to FIGS. 11 to 14 are explanatory views showing another manufacturing method in the order of steps.

In this manufacturing method, as shown in FIG. 11, a pulling rope 15 is attached to one end of the tubular resin absorbent material 2 obtained through the same steps as the above-mentioned manufacturing method (see FIGS. 3 and 4).
Then, the pulling rope 15 is passed through the multilayer composite film 3 having a diameter slightly larger than that of the resin absorbent 2 and is pulled in the direction of the arrow in the drawing to draw the resin absorbent 2 into the multilayer composite film 3. The multilayer structure film 3 has the same structure as described above and has a five-layer structure.

Next, as shown in FIG.
In addition, a vacuum hose 17 connected to a vacuum pump 16
And the vacuum pump 16 is driven to evacuate the resin absorbent 2. Then, as shown in the figure, the multilayer composite film 3 adheres to the outer surface of the resin absorbent material 2 by being pulled by the negative pressure generated in the resin absorbent material 2. Because it is larger than that of absorber 2,
As shown in FIG. 12, burrs 3 a of the multilayer composite film 3 are generated at both ends in the width direction of the resin absorbent 2.

Then, while maintaining the above state, as shown in FIG. 13, the resin absorbing material 2 and the multilayer composite film 3 in a close contact state are moved in the direction of the arrow between the heaters 18 arranged vertically. The multilayer composite film 3 to the heater 18
, The multilayer composite film 3 is sequentially welded and integrated with the outer surface of the resin absorbent material 2. At this time, the burrs 3a of the multilayer composite film 3 immediately after passing through the heater 18 are bent upward by guide rollers 19 which are vertically arranged at both left and right ends, and the main film (the burrs 3a of the multilayer composite film 3 is The portion to be removed, that is, the portion that closely adheres to the resin absorbent 2) 3b is pressed. At this time, since the pressed burr 3a is still in a heated and melted state, it is welded and integrated with the main body film 3b.

Thus, the resin absorbent 2 whose outer surface is covered with the multilayer composite film 3 as described above is impregnated with an uncured thermosetting resin such as unsaturated polyester. At 14 the pipe lining material 1 is obtained.

Next, a pipe lining method constructed by using the pipe lining material 1 manufactured as described above is shown in FIG.
5 and FIG. 15 is a sectional view showing the pipe lining method, and FIG. 16 is an enlarged detailed view of a portion A in FIG.

As shown in FIG. 15, reference numeral 21 denotes a conduit such as a sewer pipe buried in the ground, 22 denotes a manhole that opens on the ground, and a reversing nozzle 23 is provided around the opening of the manhole 22 on the ground. is set up.

When the pipe line 21 is to be repaired, one end of the pipe lining material 1 is folded outward and attached to the outer periphery of the upper portion of the reversing nozzle 23.
Water is injected from the water injection hose 24 into the inside of the folded part of the above. Then, the pipe lining material 1 is inserted into the pipe line 21 while being sequentially inverted by water pressure. When the pipe lining material 1 is inverted in this manner, the resin absorbent material 2 of the pipe lining material 1 before the inversion. Is located on the inner surface side of the resin absorbent material 2 as shown in FIG.

Therefore, in the multilayer composite film 3,
The surface film layer 3-1 is located as the innermost layer, and the heat-reactive adhesive film layer 3-2 / intermediate film layer 3-
3 / heat-reactive adhesive film layer 3-4 / melt bonding film layer 3-5 are located in this order. In addition, the fusion bonding film layer 3-5 is integrated with the resin absorbent 2 by dissolving in the nonwoven fabric of the resin absorbent 2 as described above.

Here, since the surface film layer 3-1 is made of a film having a low dynamic friction coefficient and high water resistance, the work of reversing the pipe lining material 1 is performed smoothly, Water is surely prevented from entering.

When the inverted insertion of the pipe lining material 1 into the pipe 21 has been completed over its entire length, the pipe lining material 1 is pressed against the inner peripheral surface of the pipe 21 by water pressure, for example. If the water inside the pipe lining material 1 is replaced with hot water or the water is heated by steam to heat the pipe lining material 1, the thermosetting property impregnated in the resin absorbent material 2 of the pipe lining material 1 will be obtained. Since the resin is cured by heat, the pipe 21 is repaired by lining its inner peripheral surface with the cured pipe lining material 1.

When the above-mentioned tube lining material 1 is cured, the unsaturated polyester resin which is a thermosetting resin is heated from the outside by a heating medium such as hot water or steam, and the unsaturated polyester is heated by its own heat to generate styrene from the unsaturated polyester. Even if gas is generated, the surface film layer 3-1 of the multilayer composite film 3 / the heat-reactive adhesive film layer 3-2 / the intermediate film layer 3-3 / the heat-reactive adhesive film layer 3-4 / the fusion bonding film layer Since all of the films 3-5 are made of a film having high styrene resistance, there is no problem that the multilayer composite film 3 swells and breaks.

The film layer 3 of the multilayer composite film 3
Since all of 1-3 to 5-5 are made of films having high brittle resistance, even if the pipe lining material 1 is exposed to cryogenic temperatures, the multilayer composite film 3 will not be damaged by brittleness and the like. The lining material 1 has high durability.

Further, the surface film layer 3-1 is composed of a film having a high steam barrier property,
-3 is made of a film having a high gas barrier property. Therefore, even when, for example, compressed air is used for reversing the pipe lining material 1 and steam is used for curing the thermosetting resin, the resin lining material 2 for steam is used. Is prevented by the surface film layer 3-1 and the curing of the thermosetting resin is stably performed, and the leakage of compressed air is prevented by the intermediate film layer 3-3 so that the inside of the pipe lining material 1 is highly airtight. Nature is secured.

Further, since the intermediate film layer 3-3 is made of a film having high pinhole resistance, even if the surface film layer 3-1 is broken at the time of lining, etc.,
High watertightness and airtightness can be ensured for the pipe lining material 1.

Incidentally, the multilayer composite film 3 may be double overlapped on the outer surface of the resin absorbent 2 to form a film layer having a total of 10 layers.

[0068]

As is clear from the above description, according to the present invention, the multilayer composite film has a heat-reactive adhesive film layer and a surface film layer and a fusion bonding film layer on both sides of the intermediate film layer. Thus, a pipe lining material that satisfies all the characteristics can be obtained by sharing the required characteristics to each film layer.

[Brief description of the drawings]

FIG. 1 is a partial perspective view of a pipe lining material according to the present invention.

FIG. 2 is an enlarged partial sectional view showing a configuration of a pipe lining material according to the present invention.

FIG. 3 is an explanatory view showing a manufacturing method according to the present invention.

FIG. 4 is an explanatory view showing a method for manufacturing a pipe lining material according to the present invention.

FIG. 5 is an explanatory view showing a method for manufacturing a pipe lining material according to the present invention.

FIG. 6 is an explanatory view showing a method for manufacturing a pipe lining material according to the present invention.

7 is a cross-sectional view showing a detailed structure of a multilayer composite film layer, a resin absorbent, and a pressure tube in the state shown in FIG.

FIG. 8 is a cross-sectional view showing vacuum evacuation of the resin absorbent.

FIG. 9 is an explanatory view showing another method for producing a pipe lining material according to the present invention.

FIG. 10 is an explanatory view showing another method for manufacturing a pipe lining material according to the present invention.

FIG. 11 is an explanatory view showing another method of manufacturing the pipe lining material according to the present invention.

FIG. 12 is an explanatory view showing another method for manufacturing a pipe lining material according to the present invention.

FIG. 13 is an explanatory view showing another method for manufacturing the pipe lining material according to the present invention.

FIG. 14 is an explanatory view showing another method of manufacturing the pipe lining material according to the present invention.

FIG. 15 is a cross-sectional view showing a pipe lining method constructed using the pipe lining material according to the present invention.

16 is an enlarged detail view of a portion A in FIG.

FIG. 17 is a partial cross-sectional view showing a configuration of a conventional pipe lining material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe lining material 2 Resin absorber 3 Multilayer composite film 3-1 Surface film layer 3-2 Heat-reactive adhesive film layer 3-3 Intermediate film layer 3-4 Heat-reactive adhesive film layer 3-5 Melt bonding film layer 4 Pressurizing tube 5 Compressor 7, 16 Vacuum pump 10 Heating device

[Table 1]

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takao Kamiyama 31-27 Daikancho, Hiratsuka-shi, Kanagawa Prefecture Shonan Plastics Manufacturing Co., Ltd. Inside Yokoshima Co., Ltd. (72) Inventor Shigeru Endo 2-12-4 Hanabata, Tsukuba City, Ibaraki Prefecture Inside the getter (72) Inventor Hiroyuki Aoki 1-194 Hayashi, Tokorozawa City, Saitama Prefecture

Claims (10)

[Claims] 1. A pipe lining material comprising a tubular resin absorbent material whose outer surface is covered with a plastic film and a resin curable resin is impregnated with said curable resin. A tube lining material comprising a tubular multi-layer composite film having a five-layer structure of a functional adhesive film layer / intermediate film layer / heat-reactive adhesive film layer / fusion bonding film layer. 2. The surface film layer is composed of low melting point polyethylene, polypropylene or a copolymer thereof or a high melting point nylon, and the heat-reactive adhesive film layer is medium or low melting point admer, EAA or ionomer. And the intermediate film layer is made of high melting point nylon, E
The pipe lining material according to claim 1, wherein the pipe lining material is made of VOH or polyester, and the melt-bonded film layer is made of low melting point polyethylene, polypropylene or a copolymer thereof. 3. The tube lining material according to claim 1, wherein the multilayer composite film is formed into a seamless tube by a coextrusion blown method. 4. The multi-layer composite film is made of three kinds of materials, wherein the material of the surface film layer and the material of the fusion bonding film layer and the material of both heat-reactive adhesive film layers are the same, respectively. The pipe lining material according to 1, 2, or 3. 5. A tubular resin absorption inside a tubular multilayer composite film having a five-layer structure of a surface film layer / a heat-reactive adhesive film layer / an intermediate film layer / a heat-reactive adhesive film layer / a fusion bonding film layer. Through the material, the resin absorbent is evacuated and the multilayer composite film is adhered to the outer surface of the resin absorbent, and the multilayer composite film is heated and welded to the outer surface of the resin absorbent while maintaining the state. After doing
A method for producing a pipe lining material, characterized in that a curable resin is impregnated in a resin absorbent. 6. A highly airtight pressure tube is inserted inside the resin absorbent material, and the pressure tube is expanded by fluid pressure to expand the multilayer composite film and the resin absorbent material into a circular tube. 6. The method for manufacturing a pipe lining material according to claim 5, wherein the resin absorbent is evacuated to make the multilayer composite film adhere to the outer surface of the resin absorbent. 7. The heating of the multilayer composite film is performed by moving a heating device relative to the multilayer composite film, and the multilayer composite film is moved in a length direction from one end to the other end of the resin absorbent. 7. The method for producing a pipe lining material according to claim 5, wherein the pipe lining material is sequentially welded. 8. The surface film layer is composed of low-melting polyethylene, polypropylene or a copolymer thereof, and the heat-reactive adhesive film layer is composed of medium- or low-melting admer, EAA or ionomer, The intermediate film layer is composed of high melting point nylon, EVOH or polyester, and the fusion bonding film layer is composed of low melting point polyethylene, polypropylene or a copolymer of each. Of manufacturing pipe lining material. 9. The method according to claim 5, wherein the multilayer composite film is formed into a seamless tube by a co-extrusion blown method. 10. The multi-layer composite film is made of three kinds of materials, wherein the material of the surface film layer and the material of the fusion bonding film layer and the material of both heat-reactive adhesive film layers are the same, respectively. 5,6,7,8 or 9
A method for producing the pipe lining material according to the above.