JPH10151674A - Pipe lining material and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe lining material realizing the uniform and strong bond of a plastic film to prevent the generation of burst. SOLUTION: A multilayered composite film (plastic film 3) is thermally welded to the outer surface of the surface layer 2a of a tubular resin absorbing material 2 obtained by laminating a low m.p. surface layer 2a having air permeability to the outer peripheral surface of a high m.p. nonwoven fabric 2-2 and the resin absorbing material 2 is impregnated with a curable resin to constitute a pipe lining material 1. Since the low m.p. surface layer 2a is laminated to the outer peripheral surface of a nonwoven fabric 2-1 constituting the resin absorbing material 2 in the pipe lining material 1 and the multilayered composite film 3 is thermally welded to the outer surface of the surface layer 2a, the multilayered composite film 3 can be uniformly and strongly bonded to the outer surface of the resin absorbing material and the burst of the pipe lining material can be certainly prevented.

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.

By the way, the pipe lining material used in such a pipe lining method is formed to have a diameter slightly smaller than the inner diameter of the pipe so that the surface thereof does not wrinkle after hardening. It is configured to extend sufficiently by fluid pressure so as to be able to cope with a partial increase in size due to corrosion or wear. Specifically, the pipe lining material is configured to be able to cope with a change of about −10% to + 15% of the inner diameter of the pipe.

[0004]

As described above, the pipe lining material is greatly stretched by the fluid pressure. At this time, the pipe lining material is positioned at the innermost layer of the pipe lining material by inverted insertion into the pipe. Since the plastic film is also greatly stretched, there is a problem that a burst is generated in the pipe lining material from a weak portion of the plastic film.

[0005] The following solutions are conceivable for the problem of the pipe lining material burst. (A) The plastic film is uniformly stretched by making the adhesion between the plastic film and the nonwoven fabric constituting the resin absorbent material as strong and fine as possible. (B) Increase the elongation of the plastic film. (C) Increase the thickness of the plastic film.

However, according to experiments, the above (b),
Even if the elongation or thickness of the plastic film is increased by the measure (c), if the adhesion of the plastic film to the nonwoven fabric is weak or uneven, the burst of the pipe lining material cannot be prevented. It became clear.

Therefore, the above measure (a) is most effective in preventing the burst of the pipe lining material.

The present invention has been made in view of the above problems, and an object thereof is to provide a pipe lining material capable of realizing uniform and strong adhesion of a plastic film and preventing the occurrence of burst, and a method of manufacturing the same. Is to provide.

[0009]

In order to achieve the above object, a first aspect of the present invention is to provide a tubular resin absorbent formed by laminating an air-permeable low-melting surface layer on the outer peripheral surface of a high-melting nonwoven fabric. A pipe lining material is formed by thermally welding a plastic film to the outer surface of the surface layer of the material and impregnating the resin absorbing material with a curable resin.

According to a second aspect of the present invention, in the first aspect of the present invention, the outer surface of the low melting point nonwoven fabric is mixed with the high melting point nonwoven fabric by punching and smoothed by heat treatment. It is characterized by comprising.

According to a third aspect of the present invention, in the second aspect of the present invention, the low-melting-point nonwoven fabric is made of a single substance, a mixture, a foam, or a composite of polyethylene, admer, polypropylene, ionomer, or EAA. Characterized by comprising a copolymer represented by the following formula:

According to a fourth aspect of the present invention, in the second aspect of the present invention, the low-melting-point nonwoven fabric is formed of a yarn having a two-layer structure in which the surface is made of a low-melting-point resin and the inside is made of a high-melting-point resin. I do.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the surface layer is made of a low-melting-point perforated plastic film which is heat-welded or laminated to the outer peripheral surface of the high-melting-point nonwoven fabric. It is characterized by the following.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the low-melting-point perforated plastic film is formed of a simple substance, a mixture, a foam or a composite of polyethylene, admer, polypropylene, ionomer or EAA. It is characterized by comprising a copolymer mainly composed of them.

According to a seventh aspect of the present invention, in the first aspect, the surface layer is formed of a low melting point plastic powder which is melt-bonded to an outer surface of the high melting point nonwoven fabric. .

The invention according to claim 8 is the invention according to claim 7, wherein the low melting point plastic powder is a simple substance, a mixture, a foam or a composite of polyethylene, admer, polypropylene, ionomer or EAA or a mixture thereof. It is characterized by being composed of a main copolymer.

According to a ninth aspect of the present invention, in the first aspect of the present invention, the high-melting-point nonwoven fabric is made of a simple substance of polyester, nylon, acrylic, vinylon, glass, carbon or ceramic, or a mixture thereof. Features.

According to a tenth aspect of the present invention, in the first aspect of the present invention, the plastic film thermally welded to the outer surface of the surface layer is made of polyethylene, nylon, ionomer, polypropylene, polyester, admer, and EA.
It is characterized by being composed of a simple substance or a composite of A or EVOH or a copolymer mainly composed of these.

According to an eleventh aspect of the present invention, in the first aspect of the present invention, the plastic film which is thermally welded to the outer surface of the surface layer is formed of a surface film layer / a heat-reactive adhesive film layer / an intermediate film layer / a thermal reaction. It is characterized by comprising a tubular multi-layer composite film having a five-layer structure of a conductive adhesive film layer / a fusion bonding film layer.

According to a twelfth aspect of the present invention, in the eleventh aspect, the surface film layer is made of low melting point polyethylene, polypropylene or a copolymer thereof, and the heat reactive adhesive film layer is made of a medium melting point. Or composed of low melting point admer, EAA or ionomer, the intermediate film layer is composed of high melting point nylon, EVOH or polyester, and the fusion bonded film layer is composed of low melting point polyethylene, polypropylene or respective copolymer. It is characterized by having done.

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

The invention according to claim 14 is the invention according to claims 11 and 1
14. The invention according to 2 or 13, wherein a material of the surface film layer and the material of the fusion bonding film layer and a material of both heat-reactive adhesive film layers are the same, and the multilayer composite film is formed of three kinds of materials. I do.

According to a fifteenth aspect of the present invention, a tubular resin absorbent formed by laminating an air-permeable low-melting surface layer on the outer peripheral surface of a high-melting nonwoven fabric is passed through the inside of a tubular plastic film. The resin absorbent is evacuated to make the plastic film adhere to the outer surface of the resin absorbent, and the plastic film is heated while maintaining the state, and is fused and integrated with the outer surface of the resin absorbent, and then the resin absorbent is formed. A pipe lining material is manufactured by impregnating a curable resin.

According to a sixteenth aspect of the present invention, in the invention of the fifteenth aspect, a highly airtight pressurized tube is inserted inside the resin absorbing material, and the pressurized tube is expanded by a fluid pressure so as to expand the plastic material. It is characterized in that the film and the resin absorbing material are expanded in a tubular shape, and the resin absorbing material is evacuated to make the plastic film adhere to the outer surface thereof.

According to a seventeenth aspect of the present invention, in the invention of the fifteenth or sixteenth 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.

Therefore, according to the present invention, in the pipe lining material, a low melting point surface layer having air permeability is laminated on the outer peripheral surface of the high melting point nonwoven fabric constituting the resin absorbent, and the outer surface of this surface layer is formed on the outer surface. Since the plastic film is heat-sealed, the plastic film is uniformly and strongly adhered to the outer surface of the resin absorbing material, and the burst of the pipe lining material is reliably prevented.

[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, the pipe lining material 1 according to the present invention covers the outer surface of a tubular resin absorbent material 2 with a plastic film 3 and heat-cures the resin absorbent material 2 such as unsaturated polyester. It is configured to be impregnated with a conductive resin. 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.

By the way, as shown in FIG. 2, the resin absorbing material 2 has a low melting point surface layer 2a and a high melting point nonwoven fabric 2-1.
And has a low melting point surface layer 2
a is that the low-melting non-woven fabric 2-2 is mixed with the outer surface of the high-melting non-woven fabric 2-1 by punching, and the low-melting non-woven fabric 2-2 is heated to melt the surface and smooth. It is formed by the conversion. Here, the high melting point nonwoven fabric 2-1 is polyester,
Nylon, acrylic, vinylon, glass, carbon, or a simple substance or a mixture of carbon and ceramic, and the low-melting nonwoven fabric 2-2 is a simple substance, a mixture, a foam, or a composite of polyethylene, admer, polypropylene, ionomer, or EAA. Alternatively, it is composed of a copolymer mainly composed of them. The low melting point nonwoven fabric 2-2 has a low melting point resin 2-2a 'on the surface and a high melting point resin 2
2-2 'having a two-layer structure consisting of 2-2'.

The plastic film 3 is shown in FIG.
As shown in the figure, five layers of the surface film layer 3-1 / 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 3-5. It is composed of a multilayer composite film having a laminate structure, which is formed into a seamless tube by a coextrusion inflation method. That is, the tube-shaped multilayer composite film 3 has a surface film layer 3-1 and a fusion bonded film layer 3-5 on both surfaces (an outer peripheral surface and an inner peripheral surface) with an intermediate film layer 3-3 interposed therebetween. The five-layer laminate structure is formed by bonding and integrating the reactive adhesive film layers 3-2 and 3-4, and the multilayer composite film 3 is absorbed by resin in the process of manufacturing the tube lining material 1 by heating as described later. When welding to the outer surface of the 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 dynamic friction coefficient is small with respect to the surface film layer 3-1. 2) High water resistance. 3) High steam barrier properties. 4) High heat weldability. 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.
-1 is a thickness of 10 made of low melting point polyethylene (PE), polypropylene (PP) or a copolymer thereof.
１００100 μm films are 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 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 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 above-mentioned 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.

[0038]

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

In all the multilayer composite films (1) to (5) except the multilayer composite film (6) in Table 1, the surface film layer 3-1 and the fusion bonding film layer 3-5
And the materials of the heat-reactive adhesive film layers 3-2 and 3-4 are the same, and each of the multilayer composite films (1) to
Since (5) is composed of three types of materials, the production cost of each of the multilayer composite films (1) to (5) can be kept low.

Next, a method for manufacturing the pipe lining material 1 having the above configuration will be described with reference to FIGS.
4, 5, 7, and 8 are explanatory views showing the manufacturing method according to the present invention in the order of steps, FIG. 6 is an enlarged detailed view of a portion A in FIG. 5, and FIG. FIG. 10 is a cross-sectional view showing the detailed structure of the composite film layer, the resin absorbent, and the pressure tube, and FIG. 10 is a cross-sectional view showing evacuation of the resin absorbent.

In the manufacturing method according to the present invention, first,
As shown in FIG. 4, the high melting point non-woven fabric 3 cut into a belt shape
The surface of the low-melting non-woven fabric 2-2 is heated by the heat roller 26 while the thin low-melting non-woven fabric 2-2 is mixed by punching using a punching machine 25 on the surface of the non-woven fabric 2-2. The surface layer 2a is formed by melting and smoothing and reducing the roughness of the eyes.

Next, the nonwoven fabric 2- on which the surface layer 2a is formed
5 is rounded so that the surface layer is located outside as shown in FIG. 5, the ends are butted together, and the butted portions are sewn with a sewing machine to obtain a tubular resin absorbent material 2. Then, a thin ribbon tape 27 is adhered to the outer periphery of the resin absorbent material 2 along the seamed portion to reinforce the seamed portion. As shown in detail in FIG. 6, the ribbon tape 27 has a low melting point nonwoven fabric (or a plastic film having air permeability) 27-2 on the surface of a high melting point nonwoven fabric 27-1.
Is configured.

As a method of forming the tubular resin absorbent material 2, in addition to the lock stitching, a straight stitching, a punching process with a needle, a welding process, a bonding process using a bonding agent, or the like, is used to join a butt portion of a band-shaped nonwoven fabric. Can be adopted.

Next, as shown in FIG. 7, 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 3-5 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.

As shown in FIG. 7, 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. 8 and 10, the resin absorbent 2 is evacuated using the vacuum pump 7 and the vacuum hose 8, so that the resin absorbent 2 The positioned multilayer composite film 3 is attracted by the negative pressure generated in the resin absorbent 1 and adheres to the outer surface of the surface layer of the resin absorbent 2. At this time, the surface layer is smoothed as described above to reduce the roughness of the surface, and the surface film layer 3 constituting the outermost layer of the multilayer composite film 3 is formed.
Since -1 has high pinhole resistance, even if the resin absorbent 2 is evacuated as described above, pinholes are not easily generated in the surface film 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. 10, reference numeral 9 denotes a vacuum pad.

Thereafter, as shown in FIG. 8, the resin absorbent 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, 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.

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 composed of a low-melting film having high fluidity at the time of heat welding, it melts well into the nonwoven fabric of the surface layer of the resin absorbent 2 in the molten state (see FIG. 2), the multilayer composite film 3 is firmly bonded to the outer surface of the resin absorbent 2. In this case, as described above, the low melting point nonwoven fabric 2-2 constituting the surface layer 2a is heated and melted by the heat roller 26 and smoothed (see FIG. 4). 2 is uniformly and strongly adhered to the outer surface.

Incidentally, since the film constituting the fusion bonding film layer 3-5 is inexpensive, the multilayer composite film 3 is strongly bonded to the outer surface of the resin absorbent material 2 so that the fusion bonding film layer 3-5 can be welded more strongly. Increasing the thickness does not cause a significant cost increase.

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.

Here, a method for manufacturing a tubular resin absorbent having a two-layer structure will be described with reference to FIGS.
11 to 14 are explanatory views showing a method of manufacturing a tubular resin absorbent having a two-layer structure in the order of steps.

As shown in FIG. 11, two strip-shaped non-woven fabrics 2 and 2 'having a high melting point are overlapped with each other while being shifted from each other, and the surface layer formed on the surface (lower surface) of the lower non-woven fabric 2 is formed on the outer side 2a. The two nonwoven fabrics 2 and 2 ′ are rolled in the direction of the arrow in FIG. 11 so as to be located, and formed into a tubular shape as shown in FIG.

Next, as shown in FIG.
At the butting portion of 2 ', a ribbon-shaped reinforcing nonwoven fabric 28, 2
9 and punching the reinforcing non-woven fabrics 28 and 29 using punching machines 30 and 31, thereby joining the butted portions of the two non-woven fabrics 2 and 2 'to the reinforcing non-woven fabric 2.
The tubular resin absorbent having a two-layer structure as shown in FIG. 14 is obtained by joining (punching joining) by 8, 29.

Next, another method of manufacturing the pipe lining material 1 will be described with reference to FIGS. 15 to 18 are explanatory views showing another manufacturing method in the order of steps.

In the present manufacturing method, as shown in FIG. 15, 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. 4 and 5).
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. 16, 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. 17, 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.

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. The pipe lining material 1 shown in FIG. 18 is obtained.

Next, a pipe lining method constructed by using the pipe lining material 1 manufactured as described above is shown in FIG.
9 and FIG. 19 is a sectional view showing the pipe lining method, and FIG. 20 is an enlarged detail view of a portion B in FIG.

As shown in FIG. 19, 21 is a pipeline such as a sewer pipe buried underground, 22 is a manhole opening above the ground, and an inversion nozzle 23 is provided around the periphery of the opening of the manhole 22 above the ground. is set up.

When the pipe 21 is repaired, one end of the pipe lining material 1 is bent 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.

Accordingly, 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 reversing work of the pipe lining material 1 is smoothly performed and the surface lining material 3-1 is transferred to the resin absorbent material 2. Water is surely prevented from entering.

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.

As described above, in the pipe lining material 1 according to the present invention, the low melting point surface layer 2a is laminated on the outer peripheral surface of the high melting point nonwoven fabric 2-1 constituting the resin absorbent 2, and the surface layer 2a Since the multilayer composite film 3 is heat-welded to the outer surface, the multilayer composite film 3 is
Uniformly and strongly adhered to the outer surface of the pipe, and the burst of the pipe lining material 1 during the lining work is reliably prevented.

When the 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 heat generated by the curing of the unsaturated polyester resin. Occurs, 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 3 Since -5 is composed 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 a 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.

In this embodiment, a case has been described in which a multilayer composite film having a five-layer structure is thermally welded to the outer surface of the tubular resin absorbent as a plastic film.
Examples of the plastic film thermally welded to the outer surface of the tubular resin absorbent include polyethylene, nylon, ionomer, polypropylene, polyester, admer, and EAA.
Alternatively, a single layer composed of a single or composite EVOH or a copolymer mainly composed of EVOH can be used.

Here, FIGS. 21 and 22 show another method of forming a surface layer having air permeability on the surface of the non-woven fabric having a high melting point.

In the method shown in FIG. 21, a low melting point plastic film 32 is thermally welded or laminated to the surface of a high melting point nonwoven fabric 2-2.
2 is punched using a punching machine 33 to form a perforated film.
A surface layer having air permeability is formed on the surface of the substrate. In addition, as a material of the plastic film 32, a simple substance, a mixture, a foam, or a mixture of polyethylene, admer, polypropylene, ionomer, or EAA, or a copolymer mainly containing them is selected.

In the method shown in FIG. 22, a low melting point plastic powder 35 is sprayed from a nozzle 34 on the surface of the high melting point nonwoven fabric 2-1 and the sprayed plastic powder 35 is heated by a heater 36. This is melt-bonded to the surface of the non-woven fabric 2-1 having a high melting point to form the air-permeable surface layer 2a. In addition, as the material of the plastic powder 35, a single substance, a mixture, a foam, a mixture of a polyethylene, an admer, a polypropylene, an ionomer, or EAA, or a copolymer mainly containing them is selected.

[0075]

As is apparent from the above description, according to the present invention, the surface of a tubular resin absorbent material in which a low melting point surface layer having air permeability is laminated on the outer peripheral surface of a high melting point nonwoven fabric. A plastic film is thermally welded to the outer surface of the layer, and a resin lining material is impregnated with a curable resin to form a tube lining material.This enables uniform and strong adhesion of the plastic film to the tubular resin absorption material. The effect that the burst of the lining material can be effectively prevented 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 a partial perspective view of a yarn constituting a low-melting-point nonwoven fabric.

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 enlarged detail view of a portion A in FIG. 5;

FIG. 7 is an explanatory view showing a method for manufacturing a pipe lining material according to the present invention.

FIG. 8 is an explanatory view showing a method for manufacturing a pipe lining material according to the present invention.

9 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. 7;

FIG. 10 is a cross-sectional view showing evacuation of a resin absorbent.

FIG. 11 is an explanatory view showing a method for producing a tubular resin absorbent having a two-layer structure.

FIG. 12 is an explanatory diagram illustrating a method for manufacturing a tubular resin absorbent having a two-layer structure.

FIG. 13 is an explanatory diagram illustrating a method for manufacturing a tubular resin absorbent having a two-layer structure.

FIG. 14 is an explanatory diagram illustrating a method for manufacturing a tubular resin absorbent having a two-layer structure.

FIG. 15 is an explanatory view showing another method for manufacturing a pipe lining material according to the present invention.

FIG. 16 is an explanatory view showing another method for manufacturing a pipe lining material according to the present invention.

FIG. 17 is an explanatory view showing another method of manufacturing the pipe lining material according to the present invention.

FIG. 18 is an explanatory view showing another method of manufacturing the pipe lining material according to the present invention.

FIG. 19 is a cross-sectional view showing a pipe lining method constructed using the pipe lining material according to the present invention.

20 is an enlarged detail view of a portion B in FIG. 19;

FIG. 21 is a cross-sectional view showing another method for forming a surface layer.

FIG. 22 is a cross-sectional view showing another method for forming a surface layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe lining material 2 Resin absorption material 2a Surface layer 2-1 High melting point nonwoven fabric 2-2 Low melting point nonwoven fabric 3 Multilayer composite film (plastic film) 3-1 Surface film layer 3-2 Heat reactive adhesive film layer 3 Reference Signs List 3 intermediate film layer 3-4 heat-reactive adhesive film layer 3-5 fusion bonding film layer 4 pressurizing tube 5 compressor 7,16 vacuum pump 10 heating device 32 perforated plastic film 35 plastic powder 36 heater

[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 (17)

[Claims] 1. A plastic film is heat-welded to the outer surface of a tubular resin absorbent material formed by laminating a low-melting surface layer having air permeability on the outer peripheral surface of a high-melting nonwoven fabric. A pipe lining material comprising a material impregnated with a curable resin. 2. The low-melting-point nonwoven fabric according to claim 1, wherein the outer surface of the surface layer is mixed with the high-melting-point nonwoven fabric by punching and smoothed by heat treatment. Pipe lining material. 3. The non-woven fabric having a low melting point is made of polyethylene,
3. The pipe lining material according to claim 2, wherein the pipe lining material is composed of a simple substance, a mixture, a foam or a composite of an admer, a polypropylene, an ionomer or an EAA, or a copolymer mainly composed of them. 4. The pipe lining material according to claim 2, wherein the low-melting-point nonwoven fabric is made of a yarn having a two-layer structure in which the surface is made of a low-melting-point resin and the inside is made of a high-melting-point resin. 5. The tube lining material according to claim 1, wherein the surface layer is formed of a low-melting-point perforated plastic film which is heat-welded or laminated to the outer peripheral surface of the high-melting-point nonwoven fabric. . 6. The low-melting-point perforated plastic film is made of a simple substance, a mixture, a foam or a composite of polyethylene, polypropylene, ionomer or EAA, or a copolymer mainly composed of them. The pipe lining material according to claim 5, wherein 7. The pipe lining material according to claim 1, wherein the surface layer is made of a low-melting-point plastic powder melt-bonded to an outer surface of the high-melting-point nonwoven fabric. 8. The low melting point plastic powder,
8. The pipe lining material according to claim 7, wherein the pipe lining material is composed of a simple substance, a mixture, a foam or a composite of polyethylene, admer, polypropylene, ionomer or EAA, or a copolymer mainly composed of them. 9. The high melting point nonwoven fabric is polyester,
The tube lining material according to claim 1, wherein the tube lining material is composed of a single substance of nylon, acrylic, vinylon, glass, carbon, or ceramic, or a mixture thereof. 10. The plastic film thermally welded to the outer surface of the surface layer is polyethylene, nylon, ionomer, polypropylene, polyester, admer,
2. The method according to claim 1, wherein the material is a simple substance or a complex of EAA or EVOH, or a copolymer mainly composed of EAA or EVOH.
Pipe lining material as described. 11. A plastic film which is heat-welded to the outer surface of the surface layer is formed from a surface film layer / a heat-reactive adhesive film layer / an intermediate film layer / a heat-reactive adhesive film layer /
2. The tube lining material according to claim 1, wherein the tube lining material is constituted by a tube-shaped multilayer composite film having a five-layer structure of a fusion bonding film layer. 12. The surface film layer is composed of low melting point polyethylene, polypropylene or a copolymer thereof, and the heat reactive adhesive film layer is composed of medium or low melting point admer, EAA or ionomer, 12. The pipe lining material according to claim 11, wherein the intermediate film layer is made of high melting point nylon, EVOH or polyester, and the fusion bonding film layer is made of low melting point polyethylene, polypropylene or a copolymer thereof. . 13. The tube lining material according to claim 11, wherein the multilayer composite film is formed into a seamless tube shape by a co-extrusion inflation method. 14. 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. 14. The pipe lining material according to 11, 12, or 13. 15. A tubular resin absorbent formed by laminating an air-permeable low-melting surface layer on the outer peripheral surface of a high-melting nonwoven fabric is passed through the inside of a tubular plastic film, and the resin absorbent is evacuated. Then, the plastic film is brought into close contact with the outer surface of the resin absorbent, and the plastic film is heated while maintaining the state, and is welded and integrated with the outer surface of the resin absorbent. Then, the resin absorbent is impregnated with the curable resin. A method for producing a pipe lining material, characterized in that: 16. A highly airtight pressurized tube is inserted inside the resin absorbent, and the pressurized tube is expanded by fluid pressure to expand the plastic film and the resin absorbent into a tubular shape, and The method for producing a pipe lining material according to claim 15, wherein the absorbent material is evacuated so that a plastic film is adhered to the outer surface of the absorbent material. 17. The multi-layer composite film is heated by moving a heating device relative to the multi-layer composite film, and the multi-layer composite film is moved in a length direction from one end to the other end of the resin absorbent. 17. The method for producing a pipe lining material according to claim 15, wherein the pipe lining material is sequentially welded.