JPH06344480A - Fiber reinforced thermoplastic resin pipe - Google Patents

Abstract

PURPOSE:To obtain a resin pipe using a lightweight and reutilizable material having a high strength by molding a laminate consisting of a plurality of thermoplastic resin plates compounded with fibers within a specific volume content range into a tubular form to bond the principal part thereof. CONSTITUTION:A laminate 1 consisting of thermoplastic resin plates composed of polyethylene, polyvinyl chloride or polypropylene compounded with 30-80vol.% of fibers is molded into a tubular or partially tubular form to be bonded at a principal part. As each of the fiber reinforced resin plates constituting the laminate 1, a unidirectional fiber reinforced resin plate obtained by using a fiber sheet consisting of unidirectionally arranged continuous fibers as an aggregate to impregnate the same with the above-mentioned thermoplastic resin or a multidirectional fiber reinforced resin plate (prepreg) obtained by impregnating a fabric such as plain or satin weave fabric with the resin is used. The prepreg is utilized alone according to circumstances but used as a laminate obtained by laminating prepregs so as to obtain desired thickness and fiber orientation to bond them under heating and pressure. As the aggregate of the prepreg, for example, an inorg. fiber, a metal fiber and a synthetic resin fiber are used.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a fiber reinforced thermoplastic resin tube.

[0002]

2. Description of the Related Art Conventionally, pipes are made of metal, glass,
Various materials such as resin and wood are used according to the application. However, these materials have merits and demerits, and each has a problem in that the range of use is limited.

For example, there is a problem that the metal tube is heavy and has poor corrosion resistance. Of these, the disadvantage of being weak against corrosion can be solved by lining a resin that is resistant to corrosion,
There is a problem that the weight cannot be reduced, and the weight reduction is hindered when it is attached to a ship or a vehicle.

As a lightweight tube, there is a resin tube using a thermosetting resin or a thermoplastic resin. All of these resin pipes are resistant to corrosion and light, but have problems in strength, so fiber-reinforced resin pipes in which they are reinforced with fibers have been proposed. Those using thermosetting resin are manufactured by extrusion molding,
Although it is lightweight and has high strength, there are few types of fiber-reinforced thermosetting resins that can be extruded, and even if there are suitable ones, the molding method is complicated, and thermosetting resins are recycled. Since this is not possible, there is a problem in that when the pipe is worn out and used, the whole pipe becomes industrial waste.

On the other hand, since a recyclable thermoplastic resin cannot be extruded from a fiber-reinforced material, a thermoplastic resin not containing a large amount of fibers or the like is extruded into a tubular shape and then a reinforcing material is applied to the outside thereof. Is manufactured by winding fibers and filaments. Therefore, this resin pipe has a low fiber content, and since the main thermoplastic resin and the reinforcing material are not completely integrated, there is a problem that sufficient strength cannot be obtained. It is not possible to bridge it alone. Therefore, when spanning over such a long span, a reinforcing tool such as a beam or a suspending tool is required, and eventually the facility itself becomes heavy, and the advantage that the pipe is lightweight is lost.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a fiber reinforced heat treatment using a high-strength, lightweight, reusable material. To provide a plastic resin tube.

[0007]

The above object is to form a laminate of a plurality of thermoplastic resin plates containing fibers in a volume content of 30% or more and 80% or less into a tubular or partial tubular shape, This is achieved by a resin pipe formed by joining main parts.

[0008]

With the above construction, it is possible to provide a fiber-reinforced thermoplastic resin pipe using a recyclable material having high strength and light weight.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below. The partial tubular shape in the present specification means
Refers to the shape of a segment formed by cutting the tube in at least two planes that include or are parallel to the central axis.

The fiber-reinforced resin plate constituting the laminate 1 is a unidirectional fiber-reinforced thermoplastic sheet in which continuous fibers are aligned in one direction to form a fiber sheet as an aggregate, which is impregnated with a thermoplastic resin. A multidirectional fiber reinforced thermoplastic resin plate (hereinafter referred to as a prepreg) obtained by impregnating a resin plate or a woven fabric such as plain weave, satin weave, and twill weave with the above resin is used. Generally, these prepregs are thin sheets having a thickness of 0.05 to 1 mm, and they may be used alone,
In the present invention, a laminate is used in which the layers are combined and laminated so as to have a desired thickness and fiber orientation, and these are thermocompression bonded.
When the thermocompression bonding is performed in this way, the air between the prepregs is degassed, the physical properties of the laminate are improved, and a strong and high-quality pipe is obtained.

As the aggregate of these prepregs, for example, inorganic fibers made of glass, carbon, silicon carbide, etc., metal fibers made of titanium, boron, stainless steel, etc., synthetic resins such as aramid fibers (eg "Kepler" registered trademark), etc. Fiber is used. Further, as the thermoplastic resin to be impregnated into this aggregate, polystyrene, polyvinyl chloride, high density polyethylene, polypropylene, polycarbonate,
Polybutylene terephthalate, polyether sulfone, polysulfone, polyetherimide (trademark "UL
TEM "), polyetheretherketone and polyphenylene sulfide, but are not necessarily limited thereto.

As the surface material, depending on the application,
For example, polypropylene, polystyrene and the like, foams thereof, thermoplastic resin products such as PVC and PZT, and metal sheets such as aluminum are adopted.

When manufacturing the fiber-reinforced thermoplastic resin tube according to the present invention, first, the prepreg laminate is heated and compressed. As a result, the resin in the laminate is melted, complete deaeration between the prepregs is performed, and the shaping is facilitated. Generally, it is difficult to shape a thermoplastic resin plate that is not fiber-reinforced because it has increased fluidity when heated and melted. In such a case, the resin plate must be shaped in a closed mold, or must be shaped in a softened state by being heated to a softening point below its melting point, but in any case Is not easy.

However, in the prepreg laminate used in the present invention, the thermoplastic resin is impregnated in the three-dimensionally formed aggregate, so that the resin does not flow down even if it is heated and melted, and the fiber Since it stays in the layer and the shape of the laminate is maintained, it can be easily shaped. Therefore, the fiber-reinforced thermoplastic resin pipe according to the present invention can be obtained by shaping the laminate heated to a temperature equal to or higher than the melting point and melting the resin component into a tubular shape or forming a tubular component part and joining the joint parts. Is obtained.

Further, when a surface material having a low melting point is brought into close contact with the surface of the heated laminate, the heat of the laminate melts the contact portion of the surface material with the laminate and fuses to the laminate. .
Even if the surface material does not melt at the temperature of the laminate, if this is a fiber product, etc., the fibers will be embedded in the molten resin of the laminate, and the molten resin of the laminate will be When it is cooled and solidified, the surface material is integrated with the laminate.

The present invention will be specifically described below with reference to the drawings. 1 to 6 are perspective views showing first to sixth embodiments of the fiber-reinforced thermoplastic resin pipe according to the present invention, and FIGS. 7 and 8 are cross-sectional views showing the seventh and eighth embodiments of the present invention. FIGS. 9 to 11 are perspective views showing a ninth to eleventh embodiment of the present invention, FIG. 12 is a front view and side views showing a twelfth embodiment of the present invention, and FIGS. 15 is a sectional view showing a thirteenth to fifteenth embodiment of the present invention, and FIGS. 16 to 18 are stress strain diagrams showing the results of a comparative embodiment 3.

In the figure, 1 to 15 are fiber-reinforced thermoplastic resin pipes 70, 71, which are formed by processing a laminate of prepregs.
Reference numerals 80 and 81 are eye plates, 130 is a seal, 131 is a holding tool, and 140, 150 and 151 are surface materials.

First, FIG. 1 will be described. This fiber reinforced thermoplastic resin tube 1 is a cylindrical tube, which heats one rectangular flat plate-like laminate to melt the resin,
The tubular body 1a is formed by winding it around a cylindrical tubular core so that a pair of parallel edge portions 1b, 1c overlap each other, and the edge portions 1b, 1c are pressure-bonded and spliced together. It is formed by cooling and solidification.

Next, FIG. 2 will be described. This resin pipe 2
Is a rectangular tube and is manufactured by the same method as the resin tube shown in FIG. That is, the laminated body is formed by winding the laminated body around a rectangular columnar core so that the edges 2b and 2c overlap each other to form a tubular body 2a, and then laminating the edges 2b and 2c.

Next, FIG. 3 will be described. This resin pipe 3
Is a deformed pipe and is manufactured by the same method as the resin pipe shown in FIG. That is, the laminated body is formed into a tubular body 3a by bending it into a prismatic shape having a desired irregular cross section so that the edges 3b and 3c overlap each other, and the edges 3b and 3c are spliced together.

Next, FIG. 4 will be described. This resin pipe 4
Is a cylindrical tube. This forms flange parts 4b and 4c at the edges of the cylindrical body 4a, and the flange parts 4b and 4c are
It is manufactured by crimping 4c and flange coupling.

Next, FIG. 5 will be described. This resin pipe 5
Is a partial tubular body 5 having a U-shaped cross-section each of two laminated bodies.
-1a and 5-2a, one partial tubular body 5-1a
Edge parts 5-1b and 5-1c and the other partial tubular body 5-2a
Are arranged in a tubular shape so that the edges 5-2b and 5-2c of the
The edges 5-1b, 5-1c, 5-2c, and 5-2b are pressed against each other.

Next, FIG. 6 will be described. This resin pipe 6
Is a flange 6-
1b, 6-1c, 6-2b, 6-2c, and the intermediate portions thereof are partial tubular bodies 6-1a, 6-2 each having a semicircular cross section.
The flange parts 6-1b and 6-1 are formed so as to be a.
c, 6-2b, 6-2c are arranged so as to face each other, and the overlapping flange portions 6-1b, 6-1c,
It is manufactured by pressure bonding 6-2b and 6-2c.

Next, FIG. 7 will be described. This resin pipe 7
Is a partial tubular body 7 with two semi-circular cross-sections.
-1a and 7-2a, the edges thereof are butted, and the narrow joints 70 and 71 made of the same material as the laminated body are joined to the butted portions.

Next, FIG. 8 will be described. This resin pipe 8
Is a semi-cylindrical partial tubular body 8-1 as shown in FIG.
a, 8-2a, the edges thereof are butted to form a tubular shape, and the eye plates 80, 81 having a semicircular cross section with an inner diameter equal to the outer diameter thereof are provided so as to cover the entire outer surface thereof.
It is manufactured by joining the abutting portions of a and 8-2a and the abutting portions of the eye plates 80 and 81 in an alternating manner.

Next, FIG. 9 will be described. This resin pipe 9
The three edges of the laminated body are parallel flange portions 9-
1b, 9-1c, 9-2b, 9-2c, 9-3b, 9-
3c, and the middle portions thereof are partial tubular bodies 9-1.
a, 9-2a, 9-3a, and its flange portions 9-1b, 9-1c, 9-2b, 9-2c, 9-3.
It is manufactured by arranging b and 9-3c so as to face each other so that the overlapping portions are flange-joined.

Next, FIG. 10 will be described. This resin pipe 10 has flange portions 10b, 10c wider than the flange portions 6b, 6c of the resin pipe 6 shown in FIG.
Formed into a tubular body 10a having a flange portion 10a
After b and 10c are flange-bonded to each other, they are folded back along the tube axis to be manufactured. In this way a strong flange connection is obtained.

Next, FIG. 11 will be described. The resin pipe 11 is a 90 ° elbow made of two substantially fan-shaped laminated bodies. When the resin pipe 11 is manufactured, the circular arc portions of the laminates are flange portions 11-1b and 11-1.
c, 11-2b, 11-2c, and the middle portion thereof is a partial tubular body 11-1a corresponding to the half body of the elbow,
11-2a and 11-2a, which are formed so as to be 11-2a and are arranged facing each other.
11-2b and 11-2c are pressure-bonded.

Next, FIG. 12 will be described. The resin tube 12 is a concentric reducer formed by molding and pressing two substantially trapezoidal laminated bodies. This is formed by molding the laminated body so that its hypotenuses become flange portions 12-1b, 12-1c, 12-2b, 12-2c, and partial tubular bodies 12-1a, 12-2a corresponding to the body of the reducer. , Flange portions 12-1b, 12-1c, 12-2b, 12-
2c are arranged so as to face each other and are flange-connected.

Next, FIG. 13 will be described. The resin pipe 13 is formed by connecting two rectangular laminated bodies to the flange portion 1 respectively.
The partial tubular bodies 13-1a and 13-2a having 3-1b, 13-1c, 13-2b and 13-2c and having a semicircular cross section are molded and solidified. Then, they are arranged so that their inner surfaces face each other, and the flange portions 13-1 facing each other are
b, 13-1c, 13-2b, 13-2c, a seal 130 such as packing or an adhesive is interposed between the flange 1
3-1b, 13-1c, 13-2b, 13-2c are joined by a fastener 131 such as a bolt and a nut.

Next, FIG. 14 will be described. The resin pipe 14 is formed by stacking the laminated body into flange portions 14-1b, 14-1c, 14-2b, 14-2c like the resin pipe shown in FIG.
When forming into the partial tubular bodies 14-1a and 14-2a with a mark, the sheet-like surface material 140 is formed on one surface of the laminate corresponding to the inner surface of the tube while being welded, and they are arranged in a tubular shape to be overlapped. Flange parts 14-1b, 14-1c, 1
4-2b and 14-2c are connected.

Next, FIG. 15 will be described. The resin pipe 15 is formed by stacking the laminated body into flange portions 15-1b, 15-1c, 15-2b, 15-2c like the resin pipe shown in FIG.
When the sheet-shaped surface material 150 is welded to both surfaces of the laminate when forming the attached partial tubular bodies 15-1a and 15-2a, the flange portions 15-1b and 15-1c,
15-2b and 15-2c are arranged so as to overlap with each other and are flange-connected.

The present invention will be described in more detail below by means of comparative tests. Comparative Test 1 Here, the resin pipe according to the present invention and known steel pipes and polypropylene resin pipes were used, and their weight and bending strength were compared under the same conditions. The configuration of the tube used in this comparative test is shown below.

Product of the Present Invention Material Polypropylene resin blended with 50% by volume content of glass fiber Shape of circular pipe shown in FIG. 1 60.5 mm thickness 3.8 mm length 1 m Molding method 50 by volume content After laminating thin polypropylene resin mixed with 3% of glass fiber to 3.8 mm,
The inner diameter of the laminate formed by heat welding at 250 ° C. is 52.
It was molded to be 9 mm.

Steel pipe (JIS G3452) Material Carbon steel Outer diameter 60.5 mm Thickness 3.8 mm Length 1 m

Polypropylene resin tube material Polypropylene outer diameter 60.5 mm Thickness 3.8 mm Length 1 m Table 1 shows the weight and bending strength test results of these tubes.

[0037]

[Table 1]

The resin pipe according to the present invention has a specific gravity close to that of a polypropylene resin pipe, but has a bending strength close to that of a steel pipe, and it is clear that the specific strength is four times or more the strength of both. It was

Comparative Test 2 Here, polypropylene pellets were circulated in the resin pipe 6 shown in FIG. 6 and the resin pipe 14 shown in FIG. 14 for a certain period of time, and the surface states inside these pipes were compared. In this comparative test, the same laminate as that used in comparative test 1 was used. In addition, the surface material 5 on the inner surface of the resin pipe 14
An acrylonitrile resin sheet was used for this.

As a result, the inner surface of the resin pipe 14 was not roughened, but the inner surface of the resin pipe 6 was scraped by the pellets, a large amount of polypropylene resin powder was generated, the glass fibers floated up, and there was a problem in durability. It turned out to be.

Comparative Test 3 Here, a resin pipe 3 shown in FIG. 3 and a steel pipe and a polypropylene resin pipe having the same shape as that of the resin pipe 3 are used, and they are fixed at one end so that they are horizontal, and at the other end, respectively. A vertical load was applied and the fracture status of each pipe was compared. The results are shown as stress strain diagrams in FIGS. 16 to 18, respectively. The tube used in this comparative test is made of the same material as in comparative test 1. The shapes are shown below. Thickness 0.8mm Length 100mm Width 100mm Height 50mm

Both metal pipes and polypropylene pipes break at once when buckling occurs on the fixed end side, but unlike the above, the product of the present invention does not break at once even when the resin pipe starts to break, and the resin and fiber It can be seen that the film gradually distorts while causing interfacial peeling. Since the resin pipe according to the present invention sufficiently absorbs energy in the process of being destroyed, it is tough and safe as a structural material.

Hereinafter, a case where a resin pipe is manufactured using a laminate having a fiber volume content of less than 30% or 80% or more will be shown as a comparative example. Comparative Example 1 A thin polypropylene resin plate containing 20% by volume of glass fiber as a reinforcing fiber was laminated to a thickness of 1 mm, and a laminate formed by heat welding at 250 ° C. was formed into a tubular shape. Since the fiber content was too low and the resin flowed remarkably, a good molded product could not be obtained.

Comparative Example 2 A thin polypropylene resin plate containing 85% by volume of glass fiber as a reinforcing fiber was laminated to a thickness of 1 mm, and heat-welded at 250 ° C. to form a laminate into a tubular shape. However, the fiber content was too high, the adhesion between the fiber layers was poor, and a molded product in which the resin and the fiber were integrated could not be obtained.

Although it depends on the type of resin and the properties of the fiber, in general, when the volume content of the fiber is less than 30%, the flow of the melted resin is remarkable, so that an appropriate shaping is performed by the production method of the present invention. Cannot be done, while its volume content is 8
If it exceeds 0%, the resin content decreases, so that a desired molded product cannot be obtained. Therefore, the volume content of fibers in the laminate used in the present invention is 30% or more and 80% or less, and preferably 40% to 80%.

Further, when the heated laminated body is strongly compressed for shaping, the molten resin flows out without staying between the fibers except when pressure is applied in the mold which is in close contact with the laminated body, and shaping is difficult. May be. Therefore, the molding pressure during shaping is generally set according to the temperature and viscosity of the laminate and the compressive strength of the surface material, which is 4 kg / cm ^{2 in the} conventional method.
Although it has to be set within the above wide range, in the present invention, the molding pressure of the laminate can be set to a low pressure of 3 kg / cm ² or less. That is 0.1 to 1.5 kg /
It is desirable to set it to about cm ² . The structure of the present invention is not limited to the above-described embodiments, and may be formed into, for example, a spiral tube, a bend, a T piece, an eccentric reducer, or the like, and the method of connecting the laminates may be different from each other. It is not limited to those shown in the examples, and
The present invention includes all of these, since reinforcement with a piano wire or the like may be used together, or a heat insulating layer and a cold insulating layer may be integrally provided.

[0047]

Since the present invention is constructed as described above, according to the present invention, it is possible to provide a fiber-reinforced thermoplastic resin pipe using a recyclable material having high strength and light weight.

[Detailed Description of Drawings]

FIG. 1 is a perspective view showing a first embodiment of a fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 2 is a perspective view showing a second embodiment of the fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 3 is a perspective view showing a third embodiment of the fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 4 is a perspective view showing a fourth embodiment of the fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 5 is a perspective view showing a fifth embodiment of the fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 6 is a perspective view showing a sixth embodiment of the fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 7 is a sectional view showing a seventh example of the fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 8 is a sectional view showing an eighth embodiment of the fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 9 is a perspective view showing a ninth embodiment of a fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 10 is a perspective view showing a tenth embodiment of a fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 11 is a perspective view showing an eleventh embodiment of a fiber reinforced thermoplastic resin pipe according to the present invention.

FIG. 12 is a front view and both side views showing a twelfth embodiment of a fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 13 is a sectional view showing a thirteenth embodiment of a fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 14 is a sectional view showing a fourteenth embodiment of a fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 15 is a sectional view showing a fifteenth embodiment of a fiber-reinforced thermoplastic resin pipe according to the present invention.

FIG. 16 is a stress strain diagram showing a broken state of the fiber reinforced thermoplastic resin pipe according to the present invention.

FIG. 17 is a stress strain diagram showing a broken state of a metal tube.

FIG. 18 is a stress strain diagram showing a broken state of a polypropylene resin pipe.

[Explanation of symbols]

 1 ・ ・ ・ ・ ・ ・ ・ Fiber reinforced thermoplastic resin tube 1a ・ ・ ・ ・ ・ ・ ・ ・ Tubular body 1b, 1c ・ ・ ・ ・ Edge 2 ・ ・ ・Fiber reinforced thermoplastic resin tube 2a Tubular body 2b, 2c Edge rim Fiber reinforced Thermoplastic resin tube 3a ... Tubular body 3b, 3c ... Edge 4 ... Fiber reinforced thermoplastic resin tube 4a ...・ ・ ・ Tubular body 4b, 4c ・ ・ ・ ・ ・ ・ Flange part 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fiber reinforced thermoplastic resin tube 5-1a ・ ・ ・ ・ ・-Tubular body 5-2a ... ... Tube body 5-1b, 5-1c ... Edge part 5-2b, 5-2c ... Edge part 6 ... ..Fiber reinforced thermoplastic resin tube 6-1a ..... Shaped body 6-2a ... Tubular body 6-1b, 6-1c ... Flange portion 6-2b, 6-2c ... Flange portion 7 ... -Fiber-reinforced thermoplastic resin tube 7-1a ... Tubular body 7-2a ... Tubular body 70, 71 ... Eye plate 8 ... ..... fiber reinforced thermoplastic resin tube 8-1a ..... tubular body 8-2a ..... tubular body 80, 81 .. Plate 9: Fiber reinforced thermoplastic resin tube 9-1a: Tubular body 9-2a: Tubular body 9-3a ··· Tubular body 9-1b ···· Flange portion 9-1c ···· Flange portion 9-2b ··· · Flange portion 9-2c・ ・ ・ ・ ・ ・ ・ ・ Flange 9-3b ・・ ・ ・ ・ Flange part 9-3c ・ ・ ・ ・ Flange part 10 ・ ・ ・ ・ ・ ・ ・ ・ Fiber reinforced thermoplastic resin tube 10a ・ ・ ・ ・ Tubular Body 10b, 10c ... Flange portion 11 ... Fiber-reinforced thermoplastic resin tube 11-1a ... Tubular body 11-2a ... Tubular body 11-1b, 11-1c / flange portion 11-2b, 11-2c / flange portion 12 ... Fiber reinforced thermoplastic resin tube 12-1a ... Body 12-2a ... Tubular body 12-1b, 12-1c / flange portion 12-2b, 12-2c / flange portion 13 ... Fiber reinforced thermoplastic resin tube 13-1a ..... tubular body 13-2a ..... tubular body 13-1b, 13-1c, flange 13-2b, 13-2c-Flange portion 130 --- Seal 131 --- Fastener 14 --- Fiber reinforced thermoplastic resin tube 14 -1a ..... tubular body 14-2a ..... tubular body 14-1b, 14-1c, flange portion 14-2b, 14-2c, flange portion 140 ..・ ・ ・ Surface material 15 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fiber reinforced thermoplastic resin tube 15-1a ・ ・ ・ ・ Tubular body 15-2a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Tubular body 15-1b, 15-1c / flange portion 15-2b, 15-2c / flange portion 150 ...

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 7, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

[0037]

[Table 1] ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 2, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

The above object is to form a laminate of a plurality of thermoplastic resin plates containing fibers in a weight content of 40% or more and 85% or less into a tubular or partial tubular shape, This is achieved by a resin pipe formed by joining main parts.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

[Correction content]

The product of the present invention Material Polypropylene resin containing 70% by weight of glass fiber Shape Shape of circular pipe shown in FIG. 1 60.5 mm Thickness 3.8 mm Length 1 m Molding method 70 by weight content After laminating thin polypropylene resin mixed with 3% of glass fiber to 3.8 mm,
The inner diameter of the laminate formed by heat welding at 250 ° C. is 52.
It was molded to be 9 mm.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction content]

Hereinafter, a case where a resin pipe is manufactured by using a laminate having a fiber weight content of less than 40% or 85% or more will be shown as a comparative example. Comparative Example 1 A thin polypropylene resin plate containing 20% by volume of glass fiber as a reinforcing fiber was laminated to a thickness of 1 mm, and a laminate formed by heat welding at 250 ° C. was formed into a tubular shape. Since the fiber content was too low and the resin flowed remarkably, a good molded product could not be obtained.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction content]

Comparative Example 2 A thin polypropylene resin plate containing 90% by weight of glass fiber as a reinforcing fiber was laminated to a thickness of 1 mm and heat-welded at 250 ° C. to form a laminate into a tubular shape. However, the fiber content was too high, the adhesion between the fiber layers was poor, and a molded product in which the resin and the fiber were integrated could not be obtained.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0045

[Correction method] Change

[Correction content]

Although it depends on the type of resin and the properties of the fiber, generally, when the weight content of the fiber is less than 40%, the flow of the molten resin is remarkable, so that a suitable shaping is performed by the production method of the present invention. It cannot be done, while its weight content is 8
If it exceeds 5%, the resin content decreases, so that a desired molded product cannot be obtained. Accordingly, the weight content of fibers in the laminate used in the present invention is 40% or more and 85% or less, and preferably 40% to 80%.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Katsuyuki Morita 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Toatsu Chemical Co., Ltd. (72) Hiroshi Tanabe 1190 Kasama-cho, Sakae-ku, Yokohama, Kanagawa Mitsui Toatsu Chemical Within the corporation

Claims (10)

[Claims] 1. A fiber-reinforced heat produced by forming a laminate of a plurality of thermoplastic resin plates containing fibers in a volume content of 30% or more and 80% or less into a tubular or partial tubular shape and joining the essential parts. Plastic resin tubes (1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15). 2. The fiber-reinforced thermoplastic according to claim 1, wherein the laminated body is formed by laminating a plurality of thin thermoplastic resin plates each having fibers arranged in one direction continuously in different fiber directions. Resin tubes (1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15). 3. Both edge portions (1b, 1c, 2) of one laminated body.
(2b, 3c, 3b, 3c) are overlapped to form a tubular body (1a, 2a, 3a) having a desired cross-sectional shape and are spliced together, and the fiber-reinforced thermoplastic resin pipe according to claim 1 or 2. (1, 2, 3). 4. A single laminated body is provided with a flange portion (4) at its edge.
The fiber-reinforced thermoplastic resin pipe (4) according to claim 1 or 2, which is formed by forming a tubular body (4a) having (b, 4c) and connecting the flange portions (4b, 4c) thereof. 5. A partial tubular body (5-1a, 5) comprising a plurality of laminated bodies.
-2a) and both edges (5-1b, 5-1) thereof are formed.
The fiber-reinforced thermoplastic resin pipe (5) according to claim 1 or 2, wherein (c, 5-2b, 5-2c) are overlapped and spliced. 6. A plurality of laminated bodies having flange portions (6-1b, 6-1c, 6-2b, 6-2c, 9-1) at their edges.
b, 9-1c, 9-2b, 9-2c, 9-3b, 9-3
c, 11-1b, 11-1c, 11-2b, 11-2
c, 12-1b, 12-1c, 12-2b, 12-2
c, 14-1b, 14-1c, 14-2b, 14-2
c, 15-1b, 15-1c, 15-2b, 15-2
partial tubular body (6-1a, 6-2a, 9-1) having c)
a, 9-2a, 11-1a, 11-2a, 12-1a,
12-2a, 14-1a, 14-2a, 15-1a, 1
5-2a), and the flange portions (6-1b, 6-1b,
6-1c, 6-2b, 6-2c, 9-1b, 9-1c,
9-2b, 9-2c, 9-3b, 9-3c, 11-1
b, 11-1c, 11-2b, 11-2c, 12-1
b, 12-1c, 12-2b, 12-2c, 14-1
b, 14-1c, 14-2b, 14-2c, 15-1
b, 15-1c, 15-2b, 15-2c), and the fiber-reinforced thermoplastic resin pipe (6, 9, 11, 12, 13, 14, 15) according to claim 1 or 2. 7. A partial tubular body (7-1a, 7) comprising a plurality of laminated bodies.
-2a, 8-1a, 8-2a), the edges thereof are butted together, and are joined to each other by a plank, and the fiber-reinforced thermoplastic resin pipe (7, 8) according to claim 1 or 2. 8. The fiber-reinforced thermoplastic resin pipe (10) according to claim 4, wherein the joined flange portions (10b, 10c) are further folded and joined along an edge in the longitudinal direction. 9. The fiber-reinforced thermoplastic resin tube according to claim 1, wherein the laminate is made of prepreg. 10. The fiber-reinforced thermoplastic resin tube according to claim 1, wherein the fiber is glass fiber and the thermoplastic resin is a polypropylene resin.