JPH10151673A - Pipe lining material and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe lining material ensuring the high adhedive strength with a plastic film and capable of being easily reversed at the time of execution of lining and a method for producing the same. SOLUTION: In a pipe lining material 1 constituted by covering the outer surface of a tubular resin absorbing material 2 with a plastic film and infiltrating a curable resin into the resin absorbing material 2, the plastic film is constituted of a tubular multilayered composite film having a three-layered structure of high m.p. film layer 3-1 thermally reactive adhesive film layer 3-2/molten bonded film layer 3-3. By this constitution, the molten bonding film layer 3-3 of the innermost layer of the multilayered composite film 3 is melted by heating in the manufacturing process of the pipe lining material to be melted into the outer surface of the resin absorbing material and, since the thermal reactive adhesive film layer 3-2 strongly bonds the high m.p. film layer 3-1 of a different kind and the molten bonded film 3-3, the multilayered composite film 3 is strongly bonded to the outer surface of the resin absorbing material 2.

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 melting point film 103-2 and the adhesive films 103-1 and 103-3 did not occur at the time of lining, but as shown below. Problem has 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 absorbing material 102, but has low strength of itself, and many of them have a problem that they are easily attacked by heat at the time of lining work because of their high 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 thereof is to provide a pipe lining material and a pipe lining material which can ensure high adhesive strength to a plastic film and can be easily inverted at the time of lining work. It is to provide a manufacturing method thereof.

[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. In the tube lining material constituted as described above, the plastic film is constituted by a tube-shaped multilayer composite film having a three-layer structure of a high melting point film layer / a thermally reactive adhesive film layer / a fusion bonding film layer.

According to a second aspect of the present invention, in the first aspect of the present invention, the high melting point film layer is made of high melting point nylon, EVOH or polyester, and the heat reactive adhesive film layer is made of a medium melting point or a low melting point. Admer, EAA
Alternatively, the melt-bonded film layer is made of an ionomer, 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, a tubular resin absorbent material is passed through the inside of a tubular multilayer composite film having a three-layer structure of a high melting point film layer / a thermally reactive adhesive film layer / a fusion bonding film layer. The resin absorbent is evacuated to make the multilayer composite film adhere to the outer surface of the resin absorbent, and the multilayer composite film is heated while maintaining the state, and is fused and integrated with the outer surface of the resin absorbent. A pipe lining material is manufactured by impregnating a curable resin into an absorbent material.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a highly airtight pressurized tube is inserted inside the resin absorbent, 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.

The invention according to claim 6 is the invention according to claim 4 or 5, wherein 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 heated. The resin absorbing material is sequentially welded in a length direction from one end to the other end.

According to a seventh aspect of the present invention, in the fourth, fifth or sixth aspect of the present invention, the high melting point film layer is made of a high melting point nylon, EVOH or polyester, and the heat reactive adhesive film layer is formed of a medium. It is characterized by comprising a melting point or low melting point admer, EAA or ionomer, and wherein the fusion bonding film layer is composed of low melting point polyethylene, polypropylene or a copolymer thereof.

The invention described in claim 8 is the invention according to claims 4, 5, 6
Alternatively, in the invention described in Item 7, the multilayer composite film is formed into a seamless tube by a co-extrusion inflation method.

Therefore, according to the present invention, the innermost melt-bonded film layer of the multilayer composite film is melted by heating during the production process of the pipe lining material, melts into the outer surface of the resin absorbent, and becomes a heat-reactive adhesive film layer. Strongly adheres the different types of high-melting film layers and the melt-bonded film layers, so that the multilayer composite film is strongly adhered to the outer surface of the resin absorbent and does not peel off.

[0026] Further, it is located on the outermost layer of the multilayer composite film,
When the pipe lining material is inverted, the high melting point film located at the innermost layer has a low dynamic friction coefficient, so that the pipe lining material can be smoothly inverted at the time of lining work without any resistance.

[0027]

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 or the like. 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 photocurable resin or a room temperature curable resin instead of the thermosetting resin.

As shown in FIG. 2, the multilayer composite film 3 has a three-layer laminate structure of a high melting point film layer 3-1, a heat-reactive adhesive film layer 3-2, and a fusion bonding film layer 3-3. Which is formed into a seamless tube by coextrusion inflation. That is, this tubular multilayer composite film 3
Has a three-layer laminated structure in which a different type of high-melting film layer 3-1 and a fusion bonding film layer 3-3 are strongly bonded and integrated by a heat-reactive adhesive film layer 3-2. When the multilayer composite film 3 is welded to the outer surface of the resin absorbent material 2 by heating in the process of manufacturing the pipe lining material 1, the innermost fusion bonding film layer 3
-3 melts and melts into the outer surface of the resin absorbent 2 (FIG. 2).
reference).

The high-melting-point film layer 3-1 has: 1) high gas barrier properties. 2) The coefficient of dynamic friction is small. 3) High wear resistance. 4) High melting point. 5) High pinhole resistance. 6) High styrene resistance. 7) High embrittlement resistance. And the like, and a film made of high melting point nylon, ethylene vinyl alcohol (EVOH) or polyester is used as the high melting point film layer 3-1 satisfying these characteristics.

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. And the like, and as a heat-reactive adhesive film layer 3-2 satisfying these characteristics, a medium- or low-melting point admer, EA
A film consisting of A or an ionomer is used.

Here, Admer (trade name) is an adhesive resin obtained by introducing a special functional group 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 melt-bonded film layer 3-3: 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 film made of low melting point polyethylene (PE), polypropylene (PP), or a copolymer thereof is used as the melt-bonded film layer 3-3 satisfying these characteristics.

Next, a method for 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 and FIG. 8 are cross-sectional views showing evacuation of the resin absorbent material 2, and FIG. 9 is a cross-sectional view showing an airtight structure of the multilayer composite film 3.

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

Next, as shown in FIG. 5, the tubular resin absorbent 2 is passed through the tube-shaped 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 3-3 constituting the innermost layer of the multilayer composite film 3 is formed of a film having a small coefficient of dynamic friction, 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. 10 and 11, a thin band-shaped nonwoven fabric 2a is adhered to the outer periphery of the resin absorbent material 2 along the seam thereof with a thermal adhesive so as to hide the seam. This is convenient because the seam does not appear on the surface (the inner peripheral surface of the pipe lining material 1) after the pipe lining material 1 is inverted and hardened. Incidentally, as the thermal adhesive, a polyethylene or nylon-based adhesive 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 a vacuum pump 7 and a 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 high-melting point 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 high-melting-point film layer 3-1 has a high resistance. Pinholes are less likely to occur in the melting point film layer 3-1. In FIG. 8, reference numeral 9 denotes a vacuum pad.

Thereafter, as shown in FIG. 6, the resin absorbent 2 is passed through the cylindrical heating device 10 together with the multi-layer composite film 3 and the pressurizing tube 4, and while the heating device 10 is being driven, this is pulled by 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.

Here, as described above, since the multilayer composite film 3 has the high melting point film layer 3-1, the high melting point film layer 3-1 is not melted by heating. Sufficient heat is transmitted from the heating device 10 to the fusion bonding film layer 3-3 via the high melting point film layer 3-1 and the heat-reactive adhesive film layer 3-2 inside the film layer 3-1. In this case, since the fusion-bonded film layer 3-3 is formed of a low-melting-point film having a high fluidity at the time of thermal welding, it is well melted into the nonwoven fabric on the outer surface of the resin absorbent material 2 (see FIG. 2). ), The multilayer composite film 3 is firmly bonded to the outer surface of the resin absorbent 2. In addition, this fusion bonding film layer 3
-3 is inexpensive, so that even if the thickness of the fusion bonding film layer 3-3 is increased in order to make the multilayer composite film 3 more strongly welded to the outer surface of the resin absorbent material 2, a large cost is obtained. It does not invite up.

By the way, as described above, the resin absorbent 2
As shown in FIG. 8 and FIG. 9, the multilayer composite film 3 bonded to the outer surface has holes 3 </ b> A for evacuating the resin absorbent material 2. This hole 3A is closed by a patch seal 25 adhered to the multilayer composite film 3. The patch seal 25 is composed of a high-melting point film 25-1 and a heat-reactive adhesive film 25-1 in two layers. It is strongly bonded to the high melting point film layer 3-1 of the film 3.

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

Next, another method of manufacturing the pipe lining material 1 will be described with reference to FIGS. 12 to 15 are explanatory views showing another manufacturing method in the order of steps.

In this manufacturing method, as shown in FIG. 12, 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 three-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. 13, 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. 14, the resin absorbent 2 and the multilayer composite film 3 in a close contact state are moved in the direction of the arrow between the heaters 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.

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. 15 is obtained.

Next, a pipe lining method constructed by using the pipe lining material 1 manufactured as described above is shown in FIG.
6 and FIG. 16 is a sectional view showing the pipe lining method, and FIG. 17 is an enlarged detailed view of a portion A in FIG.

As shown in FIG. 16, 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 an inversion nozzle 23 is provided around the periphery of the opening of the manhole 22 on the ground. is set up.

When the pipe 21 is to be repaired, one end of the pipe lining material 1 is turned 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. The multilayer composite film 3 covering the outer surface is located on the inner side of the resin absorbent 2 as shown in FIG.

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

Here, since the high melting point film layer 3-1 is formed of a film having a small dynamic friction coefficient, the reversing operation of the pipe lining material 1 is performed smoothly.

When the reverse 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 styrene is converted from the unsaturated polyester resin by the heat generated by curing itself. Even if gas is generated, the high-melting point film layer 3-1 / heat-reactive adhesive film layer 3-2 / fusion bonding film layer 3-3 of the multilayer composite film 3 are all made of films having high styrene resistance. Therefore, the problem that the multilayer composite film 3 swells and breaks does not occur.

The film layer 3 of the multilayer composite film 3
Since all of 1-3 to 3-3 are composed of films having high brittle resistance, even if the pipe lining material 1 is exposed to extremely low temperature, the multilayer composite film 3 will not be damaged due to embrittlement. The lining material 1 has high durability.

[0061]

As is apparent from the above description, according to the present invention, the innermost melt-bonded film layer of the multilayer composite film is melted by heating in the process of manufacturing the pipe lining material, and the outer surface of the resin absorbent material is melted. The multi-layer composite film is strongly bonded to the outer surface of the resin absorbent material to prevent the heat-reactive adhesive film layer from strongly bonding the different high melting point film layer and the fusion bonding film layer to the outer surface of the resin absorbent material. The effect that it can be obtained is obtained.

According to the present invention, the high melting point film located at the outermost layer of the multilayer composite film and located at the innermost layer when the pipe lining material is inverted has a small dynamic friction coefficient.
The effect that the reversal of the pipe lining material at the time of lining construction can be performed smoothly without resistance can be obtained.

[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.

FIG. 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 a cross-sectional view showing an airtight structure of the multilayer composite film.

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

FIG. 16 is a cross-sectional view showing a pipe lining method constructed using the pipe lining material according to the present invention.

FIG. 17 is an enlarged detail view of a portion A in FIG. 16;

FIG. 18 is a partial cross-sectional view showing a configuration of a pipe lining material according to a conventional proposal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe lining material 2 Resin absorber 3 Multilayer composite film 3-1 High-melting-point film layer 3-2 Heat-reactive adhesive film layer 3-3 Fusion bonding film layer 4 Pressurized tube 5 Compressor 7,16 Vacuum pump 10 Heating device

 ──────────────────────────────────────────────────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 (8)

[Claims] 1. A pipe lining material comprising an outer surface of a tubular resin absorbent material coated with a plastic film and impregnating a curable resin into the resin absorbent material. A tube lining material comprising a tubular multilayer composite film having a three-layer structure of a reactive adhesive film layer / a fusion bonding film layer. 2. The high-melting-point film layer is made of high-melting-point nylon, EVOH or polyester, and the heat-reactive adhesive film layer is made of a medium- or low-melting-point admer, EAA.
2. The tube lining material according to claim 1, wherein the tube is made of an ionomer, and the melt-bonded film layer is made of a 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. A tubular resin absorbent material is passed through the inside of a tubular multilayer composite film having a three-layer structure of a high melting point film layer / a thermally reactive adhesive film layer / a fusion bonding film layer, and the resin absorbent is evacuated. Then, the multilayer composite film is brought into close contact with the outer surface of the resin absorbent material, and while maintaining the state, the multilayer composite film is heated and fused and integrated with the outer surface of the resin absorbent material. A method for producing a pipe lining material, characterized in that the pipe lining material is impregnated. 5. A highly airtight pressurized tube is inserted inside the resin absorbent material, and the pressurized tube is expanded by fluid pressure to spread the multilayer composite film and the resin absorbent material into a circular tube. 5. The method for manufacturing a pipe lining material according to claim 4, wherein the resin absorbing material is evacuated to make the multilayer composite film adhere to the outer surface of the resin absorbing material. 6. 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. 6. The method for producing a pipe lining material according to claim 4, wherein the pipe lining material is sequentially welded. 7. The high-melting-point film layer is made of high-melting-point nylon, EVOH or polyester, and the heat-reactive adhesive film layer is made of a medium- or low-melting-point admer, EAA.
7. The method for producing a pipe lining material according to claim 4, wherein the material is made of an ionomer, and the melt-bonded film layer is made of low melting point polyethylene, polypropylene, or a copolymer thereof. 8. The method according to claim 4, wherein the multilayer composite film is formed into a seamless tube by a co-extrusion blown method.