JP2007203723A - Tube made of fiber-reinforced plastic, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tube made of a fiber-reinforced plastic (FRP) which generates no pits in the surface of the tube after a surface grinding process and is excellent in the surface quality, and to provide its stable manufacturing method. <P>SOLUTION: This tube made of the fiber-reinforced plastic has a plurality of fiber-reinforced plastic layers, and the outermost layer 30 is made into a fiber-reinforced plastic layer for grinding. In this manufacturing method for the tubes made of the fiber-reinforced plastic, fiber-reinforced plastic layers 20 other than the fiber-reinforced plastic layer 30 for grinding for the outermost layer are fabricated by a filament winding method. The fiber-reinforced plastic layer 30 for grinding for the outermost layer is fabricated by a tape winding method or a sheet winding method. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a fiber reinforced plastic (FRP) tube using a reinforcing fiber such as carbon fiber, glass fiber, or organic fiber used for industrial machine parts, structural materials for civil engineering and the like, and a method for manufacturing the same.

  FRP pipes using reinforcing fibers such as carbon fiber, glass fiber, organic fiber, etc. are lighter, higher rigidity, higher strength compared to metal pipes such as steel and aluminum that have been used for general purposes. It has excellent characteristics such as corrosion resistance, and is used as a body part of industrial rolls such as transport rolls and take-up rolls for papermaking, paper for printing machines, films and the like.

  In general, when an FRP tube is used as a body part of an industrial roll, after the surface of the tube is ground, surface treatment such as plating, rubber lining, and resin coating is performed.

  As a manufacturing method of FRP tube, conventionally, a filament winding method (FW method) in which a continuous fiber is impregnated with a resin and wound around a rotating mandrel (cylindrical and often made of metal) at a predetermined angle, or a resin in advance is used. A sheet winding method (SW method) in which a prepreg, which is an impregnated fiber material, is wound around a rotating mandrel is employed.

  The SW method requires cutting the prepreg into a predetermined angle and size, and has a low degree of freedom with respect to the fiber orientation angle. In addition, depending on the manufacturing apparatus, the size of the FRP pipe body that can be manufactured is limited, and the production efficiency is lowered.

  On the other hand, the FW method has a high degree of freedom with respect to the fiber orientation angle. Further, by using a mandrel that is as long as possible and arranging a large number of mandrels in parallel and performing the winding operation at the same time, the production efficiency becomes higher compared to the SW method.

  On the other hand, in comparison with the FRP tube manufactured by the SW method, the tube manufactured by the FW method may generate a lot of voids (pits) in which neither resin nor reinforcing fibers exist on the surface after grinding. Therefore, the surface quality is inferior.

  When surface treatment such as plating, rubber lining, resin coating, etc. is performed after grinding, if there are voids (pits) on the surface treatment surface, the surface treatment becomes difficult or very time consuming and inefficient.

In order to solve this problem, the present inventors, as shown in Patent Document 1, arrange an angular layer in which the reinforcing fiber bundles do not intersect in the grinding layer, thereby creating voids in the surface-treated surface. Proposed ways to reduce.
JP 2003-340927 A

However, as a result of further research experiments,
(1) It is very difficult to prevent the occurrence of pits other than at the intersection of the reinforcing fiber bundles.
(2) Furthermore, when the reinforcing fiber type, the resin type, and the production conditions to be used are changed, it is difficult to stably obtain good quality with few pits.
I understood that.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a fiber reinforced plastic (FRP) tube body that is free from pits on the surface of the tube body after surface grinding and has excellent surface quality, and a method for manufacturing the same.

  Another object of the present invention is to improve the productivity, and stably produce an FRP tubular body having excellent surface quality without generating pits on the surface of the tubular body after surface grinding. It is providing the manufacturing method of the FRP pipe body which can do.

The above object is achieved by the FRP pipe body and the manufacturing method thereof according to the present invention. In summary, according to one aspect of the present invention, in a method of manufacturing a fiber reinforced plastic tube having a plurality of fiber reinforced plastic layers, the outermost layer being a fiber reinforced plastic layer for grinding,
The fiber reinforced plastic layer other than the outermost grinding fiber reinforced plastic layer should be made by the filament winding method, and the outermost grinding fiber reinforced plastic layer should be made by the tape winding method or the sheet winding method. A method for producing a fiber reinforced plastic tube is provided.

  According to one embodiment of the present invention, the tape winding method impregnates a continuous tape-like mat having a width of 5 to 100 mm with resin, and the sheet winding method impregnates the sheet-like mat with resin. While being cured, it is performed by wrapping on a tubular body made of a fiber-reinforced plastic layer before curing, semi-cured, or completely cured, which is formed by a filament winding method.

  According to another embodiment of the present invention, the sheet winding method is a tubular structure comprising a fiber reinforced plastic layer formed by a filament winding method and having been cured, semi-cured, or fully cured. It is performed by winding a sheet-like mat prepreg, UD prepreg, or cross prepreg around the body.

  According to another embodiment of the present invention, the ground fiber reinforced plastic layer for grinding is ground after curing.

According to another aspect of the present invention, in a fiber reinforced plastic tube having a plurality of fiber reinforced plastic layers, the outermost layer being a fiber reinforced plastic layer for grinding,
A fiber reinforced plastic tube comprising a fiber reinforced plastic layer produced by a filament winding method and an outermost fiber reinforced plastic layer for grinding produced by a tape winding method or a sheet winding method. Provided.

  According to an embodiment of the present invention, the outermost layer is a mat layer, a UD layer molded with a UD prepreg, or a cross layer molded with a cross prepreg. The outermost ground fiber reinforced plastic layer for grinding is ground.

  In the present invention, according to one embodiment, the fiber reinforced plastic layer is formed of one or more of carbon fiber, glass fiber, or organic fiber, epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester. It is comprised by what impregnated resin or phenol resin.

  According to the present invention, as an outermost layer of an FRP tubular body manufactured by a filament winding (FW) method, a mat layer, a mat prepreg layer, a UD prepreg layer, or a cross prepreg layer is used as a fiber-reinforced plastic layer for grinding. Since it is configured, pits are not generated on the surface of the tubular body after surface grinding, and the surface quality is excellent. Moreover, according to the manufacturing method of this invention, a FRP pipe body can be manufactured stably with high productivity.

  Hereinafter, the FRP pipe body and the manufacturing method thereof according to the present invention will be described in more detail with reference to the drawings.

Example 1
FIG. 1 shows a schematic cross-sectional configuration of an embodiment of a fiber reinforced plastic (FRP) tube according to the present invention.

  The FRP tubular body 10 of the present invention has a multilayer structure in which fiber reinforced plastics in which a reinforced fiber is impregnated with a resin are laminated in layers, and in this embodiment, an inner layer tubular body 20 that forms an inner layer region, and an inner layer tubular And an outermost layer 30 for grinding formed on the outer periphery of the body 20. In this embodiment, the tubular body has an inner diameter (D1) of 40 to 200 mm, an outer diameter (D2) of 60 to 250 mm, and a length of about 500 mm to 4000 mm, but is not limited thereto.

  In this embodiment, the inner layer tubular body 20 is formed of the first layer, the second layer, and the third layer of fiber reinforced plastic layers 20a, 20b, and 20c from the inner layer to the outer layer. The four fiber reinforced plastic layers 30 are fiber reinforced plastic layers to be ground.

  According to the present invention, the outermost layer, in this embodiment, the fourth layer of fiber reinforced plastic layer 30 for grinding is produced by a tape winding method or a sheet winding method to form the inner layer tubular body 20 other than the outermost layer 30. The other fiber-reinforced plastic layers, that is, the first layer, the second layer, and the third layer of fiber-reinforced plastic layers 20a, 20b, and 20c in this embodiment are manufactured by a filament winding method.

  In this embodiment, the first fiber reinforced plastic layer 20a is alternately traversed at + 45 ° and −45 ° orientation angles (α1) to form ± 45 ° layers. Similarly, the second fiber reinforced plastic layer 20b is alternately traversed at + 10 ° and −10 ° orientation angles (α2) to form ± 10 ° layers, and the third fiber reinforced plastic layer 20c is The 90 ° layer has an orientation angle (α3) of 90 °.

  The first to third fiber reinforced plastic layers 20a, 20b, and 20c are preferably carbon fibers bundles of 6000 to 48000 carbon fibers, for example, carbon fiber filaments having a diameter of 5 to 15 μm. Although it is possible, it is not limited to this. As the reinforcing fibers, glass fibers or organic fibers such as aramid, nylon, polyester, PBO and the like can be used by mixing one or more kinds thereof.

  The resin may be a thermosetting resin. As the thermosetting resin, a room temperature curing type or thermosetting type epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester resin, or phenol resin may be used. It can be preferably used.

  The volume content of the reinforcing fibers is generally 40 to 70% by volume, usually about 60% by volume.

  In this embodiment, the outermost fiber reinforced plastic layer 30 is a mat layer impregnated with a resin.

  More specifically, as the mat used for the mat layer, a sheet-like or tape-like chopped strand mat, a continuous strand mat, or the like can be used, and the reinforcing fiber can be carbon fiber, glass fiber, or aramid. , Nylon, polyester, PBO, and other organic fibers can be used singly or in combination.

Further, the resin impregnated in the mat can be a thermosetting resin similar to that used in other fiber-reinforced plastic layers. That is, as the thermosetting resin, room temperature curing type or thermosetting type epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester resin, or phenol resin can be preferably used. The volume content of the reinforcing fibers is generally 10 to 70% by volume, usually about 30% by volume. That is, the basis weight of the mat sheet 10 to 200 g / m ^2, typically a 50 g / m ² approximately. Further, the thickness of the mat layer 14 is 0.2 to 3.0 mm, and is usually about 1.5 mm.

  Therefore, according to the present embodiment, the fiber reinforced plastic layer 30 which is the outermost mat layer is not formed with voids or excessive resin portions, and even if the outermost layer 30 is subjected to surface grinding, the surface of the tubular body There are no pits in the layer. Thereby, surface treatment such as plating after grinding, rubber lining, and resin coating becomes extremely easy, and the treatment can be performed in a short time and is efficient.

  The layer configuration of the fiber reinforced plastic pipe body 10 of the present embodiment is not limited to the above-described configuration shown in FIG. 1, and various configurations are possible. For example, depending on manufacturing problems, another layer may be formed on the ground surface layer after grinding.

  However, what is important in the present embodiment is that, as described above, the fiber-reinforced plastic layer that is ground at least after molding and is a surface layer is formed of a mat layer that is cured by resin impregnation.

Example 2
Next, the manufacturing method of the fiber reinforced plastic tube 10 described in the first embodiment will be described.

  First, a filament winding method for forming the inner layer tubular body 20 (20a, 20b, 20c) from the first layer to the third layer will be described in the present embodiment.

  In FIG. 2, schematic structure of one Example of the manufacturing apparatus 50 for manufacturing the inner-layer tubular body 20 by FW method is shown. According to the present embodiment, the manufacturing apparatus 50 includes the filament winding apparatus 51 including the mandrel 1, and the shaft portion 2 of the mandrel 1 is rotatably supported by the rotation support means 52. The mandrel 1 is connected to a driving means M such as an electric motor, and can be driven to rotate in a desired rotation direction at an arbitrary rotation speed.

  In this embodiment, as shown in FIGS. 3 and 4, the mandrel 1 used in the FW method includes a body portion 1a and a shaft portion (rotating shaft) 2 provided integrally in the axial direction of both ends thereof. Have Moreover, in this embodiment, pinned rings 3 (3a, 3b) in which a large number of pins 4 are implanted on the outer periphery are detachably attached to both ends of the body portion of the mandrel 1.

  The pinned ring 3 functions as a non-slip jig at the end of the reinforcing fiber bundle F wound around the body 1 a of the mandrel 1.

  When the FW method is performed using the mandrel 1 having such a configuration, first, the rings 3 a and 3 b with pins are attached to both ends of the body portion 1 a of the mandrel 1, and the mandrel 1 is attached to the filament winding apparatus 51.

  A reinforcing fiber supply device 60 is disposed adjacent to the filament winding device 51. The reinforcing fiber supply device 60 includes a bobbin stand 61 that supplies a large number of reinforcing fiber bundles f. The reinforcing fiber bundles f from the bobbin stand 61 are impregnated with a resin L in a resin tank 62 to form a reinforcing fiber bundle F. Subsequently, the reinforcing fiber bundle F is fed to the traverse device 63. The traverse device 63 supplies the reinforcing fiber bundle F in which the mandrel 1 is impregnated with resin while moving along the longitudinal direction of the rotating mandrel 1.

  Accordingly, the reinforcing fiber bundle F is spirally wound around the outer peripheral surface of the mandrel 1 at a predetermined orientation angle (spiral angle) α. The rotational speed of the mandrel 1 and the moving direction and moving speed of the traverse device 63 are appropriately selected to obtain a fiber-reinforced plastic layer having a desired orientation angle (α) and layer thickness.

  According to the present embodiment, the fiber reinforced plastic having the structure shown in FIG. 1 is formed from the inner layer to the outer layer by the first layer, the second layer, and the third layer of fiber reinforced plastic layers 20a, 20b, and 20c. The inner layer tubular body 20 will be described as being manufactured.

  First, the reinforcing fiber bundle F impregnated with the resin L is wound at an angle of orientation angle (α) = + 45 °. That is, the reinforcing fiber bundle F wound around the body 1 of the mandrel 1 from the first end of the mandrel 1, that is, the pinned ring 3a side, is applied to the second end of the mandrel 1, that is, the pinned ring 3b. When it reaches, it turns between the pins 4 of the ring with pin 3b and between the other pins 4, returns to the mandrel body 1a again, and goes toward the pinned ring 3a on the first end side. At this time, the rotation direction of the mandrel 1 is fixed without changing. Therefore, the reinforcing fiber bundle F wound around the mandrel 1 has an orientation angle (α) of −45 °. The reinforcing fiber bundle F also turns in the same manner as described above in the pinned ring 3a on the first end side, and is wound around the second end side. By repeating this reciprocation of the traverse, a first layer (± 45 ° layer) 20a having a predetermined thickness is formed on the mandrel.

  Similarly, the ± 10 ° layer 20b of the second layer is formed on the ± 45 ° layer 20a of the first layer. Then, a third 90 ° layer 20c is formed on the second ± 10 ° layer 20b.

  Next, a method for manufacturing the outermost mat layer 30 will be described with reference to FIGS.

Production Example 1
According to the present embodiment, the mat layer 30 is subsequently molded as the outer layer of the inner tubular body 20 molded by the FW method as described above (FIG. 5A).

  First, a roll of mat sheet having a thickness (t) of 3.0 mm or less, usually 0.5 to 1.0 mm, as shown in FIG. 5B, has a width (w) of 5 to 100 mm, usually 40 to 40 mm. The mat tape 30T is manufactured by slitting into a tape shape of about 60 mm. If the thickness (t) exceeds 1 mm and the width (w) exceeds 100 mm, it is not preferable because a constant tension cannot be applied in the width direction and problems such as wrinkles occur.

  While the mat tape 30T having such a configuration and shape is impregnated with resin, the mat tape 30T is wound around the inner tubular body 20 as shown in FIG. 5B to form the mat layer 30 as the outermost layer. After a predetermined number of reciprocations are wound until the mat layer 30 has a predetermined thickness (T), the mat layer 30 is placed in a heat curing furnace and the resin is cured to obtain the FRP tube body 10. Usually, the thickness (T) is 0.5 to 2.0 mm.

  The mat tape 30T is tightly wound on the outer peripheral surface of the inner layer tubular body 20 when the spiral angle is α, as shown in FIG. 5B, at 0 ° <α <90 °, or at a predetermined pitch. It is possible to wind at the interval P. The pitch interval P is not limited to this, but is normally P = 0 to 20w (w is the width of the mat tape 30T).

  As described above, the mat layer 30 does not have to be a single layer, and can be provided by laminating a plurality of layers as necessary. At this time, each mat layer 30 has its spiral angle, spiral direction, and pitch. The interval and the like can be arbitrarily set as necessary.

  The timing of winding the mat tape 30T is not limited to the case where the mat tape 30T is wound around the inner layer tubular body 20 before curing, but the mat tape 30T may be wound after semi-curing or after complete curing. In this case, the inner layer tubular body 20 may remain attached to the mandrel 1, but it may be pulled out from the mandrel 1 and cut to an appropriate length, and then the mat tape 30T may be wound around.

Production Example 2
In the production example 1 described above, the mat layer 30 as the outermost layer is manufactured by so-called tape winding, in which the mat tape 30T is wound around the inner tubular body 20 while the mat tape 30T is impregnated with resin. However, the present invention is not limited to this.

  For example, a so-called mat prepreg sheet in which a sheet-like mat is impregnated with a resin in advance can be used.

  The mandrel 1 formed with a plurality of fiber reinforced plastic layers 20a, 20b, 20c by the filament winding method is removed from the filament winding apparatus 51 and placed in a heating furnace (not shown), and semi-cured or completely cured. An inner-layer tubular body 20 that is a molded body is obtained. Next, the inner layer tubular body 20 is pulled out from the mandrel 1 and cut into an appropriate length. Usually, in order to increase productivity, in the filament winding apparatus 51, the tubular body 20 having a length of about 4 m is formed and cut into a length of about 2 m.

  In the present embodiment, a mat prepreg sheet is wound around the inner layer tubular body 20 thus obtained by a sheet winding method. In some cases, a mat prepreg sheet can be wound around the inner layer tubular body 20 before curing without pulling out the mandrel 1.

  FIG. 6 shows an example of an apparatus used in sheet winding. That is, in this embodiment, as shown in FIG. 6, the sheet winding apparatus 70 includes two support rollers 71 and 72 that are rotationally driven, and the inner layer tubular body 20 is connected to the two support rollers 71 and 72. Put on top and rotate. Next, a sheet-like mat prepreg 30P is supplied to the rotating inner layer tubular body 20, and the mat prepreg sheet 30P is pressed against the outer peripheral surface of the inner layer tubular body 20 by a pressing roller 73. Thus, the mat prepreg sheet 30P is wound around the inner layer tubular body 20. The outermost mat layer 30 is formed by winding a predetermined thickness. The mat layer 30 is ground after being cured.

  In the above description, the mat layer 30 is formed on the inner tubular body 20 using a sheet-like mat prepreg sheet. However, when the sheet winding method is used, the resin is not yet impregnated in place of the mat prepreg sheet. It is also possible to use an impregnated sheet-like mat and wind the inner layer tubular body 20 while impregnating the mat sheet with a resin.

  According to the present embodiment described in Production Examples 1 and 2, the fiber reinforced plastic layers 20 (20a, 20b, 20c) other than the outermost ground fiber reinforced plastic layer 30 are produced by the filament winding method. The outermost layer fiber reinforced plastic layer 30 for grinding can be manufactured with the tape winding method or the sheet winding method, so that the fiber reinforced plastic tubular body 10 can be manufactured stably and stably. it can.

  In addition, according to the present embodiment, the outermost layer 30 is made of a mat layer formed by a tape winding method or a sheet winding method, or a mat prepreg layer that is sheet-winded. Even if grinding is performed, pits are not generated in the surface layer. As a result, surface treatment such as plating, rubber lining and resin coating after grinding is extremely facilitated.

  In addition, according to the method of drawing the inner layer tubular body 20 from the mandrel (mold) 1 and molding the mat layer after semi-curing or completely curing in the above manufacturing method, the exclusive time of the filament winding apparatus and the curing furnace Therefore, the mandrel can be reused, and the inner layer tubular body 20 pulled out from the mandrel has a light weight and good portability, thereby improving workability.

Example 3
In Examples 1 and 2, the outermost fiber reinforced plastic layer 30 uses a tape winding method performed while a tape-like mat is impregnated with a resin, a sheet winding method performed while a sheet-like mat is impregnated with a resin, or a mat prepreg. It was described as being manufactured by the sheet winding method.

  However, the outermost fiber reinforced plastic layer 30 is a UD prepreg made by impregnating a resin in a reinforcing fiber sheet produced by arranging reinforcing fibers in one direction, or a reinforcing fiber sheet used as a woven fabric. It can also be produced by molding a UD layer or a cloth layer, respectively, using a cloth prepreg impregnated with a resin and made into a semi-cured state.

  The UD prepreg and the cross prepreg can be used as a reinforcing fiber by mixing one or more organic fibers such as carbon fiber, glass fiber, aramid, nylon, polyester, PBO.

The resin impregnated in the reinforcing fiber can be the same thermosetting resin as that used in the other fiber-reinforced plastic layer. That is, as the thermosetting resin, room temperature curing type or thermosetting type epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester resin, or phenol resin can be preferably used. The volume content of the reinforcing fibers is generally 40 to 70% by volume, usually about 55% by volume. That is, the prepreg of basis weight 100 to 400 g / m ^2, typically a 250 g / m ² approximately. Further, the thickness (T) of the UD layer or the cloth layer 30 is set to 0.1 to 0.4 mm, usually about 0.25 mm.

  According to this embodiment, first, a sheet-like UD prepreg or cross prepreg is cut into a predetermined size.

  The UD prepreg sheet and the cross prepreg sheet 30P having a predetermined size are wound around the inner layer tubular body 20 by the sheet winding method using the sheet winding apparatus 70 described with reference to FIG. 6 in the second embodiment, for example. It is done. The inner layer tubular body 20 is in a state before curing, in a semi-cured state, or completely cured. The FRP tubular body 10 formed by winding the prepreg sheet 30P by a predetermined thickness and having the UD layer or the cloth layer formed on the outermost layer is conveyed to a heat curing furnace and cured. After curing, the outermost layer 30 is ground.

  In this embodiment, since the UD layer or the cloth layer is formed by a sheet winding method using a prepreg in the outermost layer, there is no void, and even if the outermost layer is ground, pits are generated in the surface layer. There is nothing. As a result, surface treatment such as plating, rubber lining and resin coating after grinding is extremely facilitated.

  The timing for winding the UD prepreg or the cross prepreg is not limited to the case where the UD prepreg or the cross prepreg is wound around the FRP tubular body after semi-curing as described above, but the UD prepreg or the cross prepreg may be wound before curing or after complete curing.

  However, according to the method of drawing the inner layer tubular body 20 from the mandrel and molding the outermost layer after semi-curing or after complete curing, the exclusive time of the filament winding apparatus and the curing furnace can be reduced, and the mandrel (mold) ), And the inner-layer tubular body 20 pulled out from the mandrel is light in weight and good in portability, so that workability can be improved.

It is a schematic structure sectional view showing one example of the FRP pipe body of the present invention. It is a schematic block diagram of a filament winding apparatus. It is a front view of a mandrel. It is a perspective view which shows the end surface of a mandrel. It is explanatory drawing of the method of winding the mat tape by tape winding. FIG. It is explanatory drawing of the method of winding the prepreg sheet | seat by sheet winding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mandrel 10 Fiber reinforced plastic pipe body 20 Inner layer tubular body 30 Outermost layer (fiber reinforced plastic layer for grinding)
51 Filament winding device 70 Sheet winding device

Claims (9)

In a method for manufacturing a fiber reinforced plastic tube having a plurality of fiber reinforced plastic layers and the outermost layer being a fiber reinforced plastic layer for grinding,
The fiber reinforced plastic layer other than the outermost grinding fiber reinforced plastic layer should be made by the filament winding method, and the outermost grinding fiber reinforced plastic layer should be made by the tape winding method or the sheet winding method. A method for producing a fiber-reinforced plastic tubular body.   In the tape winding method, a continuous tape-like mat having a width of 5 to 100 mm is impregnated with a resin. In the sheet winding method, the sheet-like mat is impregnated with a resin, and the filament winding method is used. 2. A fiber reinforced plastic tube according to claim 1, wherein the tube is wound on a tubular body comprising a fiber reinforced plastic layer before being cured, semi-cured or fully cured. Production method.   In the sheet winding method, a sheet-like mat prepreg or UD prepreg is formed on a tubular body composed of a fiber-reinforced plastic layer before curing, semi-cured, or completely cured formed by a filament winding method. Or a method for producing a fiber-reinforced plastic pipe body according to claim 1, which is performed by winding a cross prepreg.   4. The method for producing a fiber-reinforced plastic pipe body according to claim 1, wherein the outermost ground fiber-reinforced plastic layer for grinding is ground after curing.   The fiber reinforced plastic layer is composed of one or more of carbon fiber, glass fiber, or organic fiber impregnated with epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester resin, or phenol resin. The method for producing a fiber-reinforced plastic tubular body according to any one of claims 1 to 4, wherein: In a fiber reinforced plastic pipe body having a plurality of fiber reinforced plastic layers and the outermost layer being a fiber reinforced plastic layer for grinding,
1. A fiber-reinforced plastic tube comprising: a fiber-reinforced plastic layer produced by a filament winding method; and an outermost fiber-reinforced plastic layer for grinding produced by a tape winding method or a sheet winding method.   7. The fiber-reinforced plastic pipe body according to claim 6, wherein the outermost layer is a mat layer, a UD layer molded with a UD prepreg, or a cross layer molded with a cross prepreg. .   8. The fiber reinforced plastic pipe body according to claim 6, wherein the outermost ground fiber reinforced plastic layer for grinding is ground. The fiber reinforced plastic layer is composed of one or more of carbon fiber, glass fiber, or organic fiber impregnated with epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester resin, or phenol resin. The fiber-reinforced plastic pipe body according to any one of claims 6 to 8, wherein the pipe body is made of fiber reinforced plastic.

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