JP2011073288A - Method of molding joint for fiber-reinforced resin pipe - Google Patents

Abstract

There is provided a molding method capable of obtaining a joint for a fiber-reinforced resin pipe having no appearance of wrinkles, good appearance, and strength.
A method for forming a pipe joint is formed by laminating a reinforcing fiber base material 2 on a pipe joint half-molding die 1 to form a reinforcing fiber base material layer. The joint halves 1 are hermetically covered, and a pressure reducing line for reducing the pressure inside the bag film 6 to a vacuum state and an injection line for injecting resin into the bag film are connected, and the bag resin is flowable under reduced pressure. , The resin is solidified to form a pipe half joint member, and the pipe half joint members are combined.
[Selection] Figure 4

Description

  The present invention relates to a method for forming a fiber-reinforced resin pipe joint.

Fiber-reinforced resin molded bodies have been widely used because they are lightweight and have high strength. For forming the tubular body, a hand lay-up molding method, a filament winding method or a sheet winding method is generally used. In the hand lay-up molding method, the mold is manually impregnated with a brush or roller and laminated to a predetermined thickness while defoaming. The filament winding method impregnates continuous fibers with resin. In the sheet winding method, a rotating mandrel (which is often made of a cylindrical metal) is wound at an appropriate winding angle and formed into a predetermined shape (see, for example, Patent Document 1). A woven fabric of the reinforcing fibers thus obtained is wound helically around the core material, and the woven fabric is impregnated with resin and cured (see, for example, Patent Document 2).
However, these molding methods wind the resin around the mold while impregnating the fluid liquid resin into the reinforcing fiber. It is difficult to control the thickness, and if a curing agent is mixed, the curing progresses over time, so the work cannot be interrupted, etc., making relatively large molded products. This is not preferable and expensive, and there is a problem that styrene or the like is volatilized during the production.

On the other hand, in recent years, various vacuum injection molding methods have been proposed in which molding is performed under reduced pressure such as by vacuum suction.
The basic technique of this vacuum injection molding method is disclosed in, for example, Patent Document 3, in which a fiber layup layer is disposed in a mold and an injection pipe for resin distribution is disposed thereon. And then encapsulating with a bag film, sealing the periphery of the bag film, and injecting resin into the vacuum-sucked bag film to form a molded product. In addition, a reinforcing fiber base material is arranged, and a resin diffusion material is appropriately provided through a release material, and this is covered with a bag film, sealed, and the interior covered with the bag film is placed in a vacuum reduced pressure state so that the resin is placed in the bag film. There is a molding method for forming a molded product by injection (see, for example, Patent Documents 4 and 5).

  However, such a vacuum injection molding method, fiber-reinforced resin tubular body, there are various problems, especially for use in fiber-reinforced plastic cheese. For example, when a rotating cylinder type / cylindrical product is coated in a dry state without impregnating resin with the required amount of reinforcing fiber and the required wall thickness, the sheet-like reinforcing fiber is wrapped around the cylindrical type / cylindrical product as it is to create a vacuum. The excessively compressed portion of the fiber is wrinkled in the axial direction, and this wrinkle not only deteriorates the appearance of the molded product but also decreases the strength.

Japanese Patent Publication No. 06-26858 JP 2007-136997 A JP-A-10-504001 JP 2002-307463 A JP-A-60-83826

  SUMMARY OF THE INVENTION An object of the present invention is to provide a molding method capable of providing a fiber-reinforced resin pipe joint that has no appearance of wrinkles, has a good appearance, and maintains strength.

  As a result of diligent research to solve the above-mentioned problems, the present inventors have laminated a reinforcing fiber base material on a pipe joint-shaped halved mold until the required amount and required thickness are obtained, and a member formed by a vacuum injection molding method It has been found that coalescing each other contributes to solving the problem, and the present invention has been made based on this finding.

  That is, according to the first invention of the present invention, a reinforcing fiber base material layer is formed by laminating a reinforcing fiber base material on a pipe joint half-molding die, and this reinforcing fiber base material layer is formed with a bag film. Cover the halved mold in an airtight manner and connect a vacuum line for reducing the pressure inside the bag film to a vacuum and an injection line for injecting resin into the bag film, and sucking and injecting a fluid resin into the bag film under reduced pressure Then, a method for forming a pipe joint is provided, in which the resin is solidified to form a pipe half joint member, and the pipe half joint members are combined.

  According to the second invention of the present invention, in the first invention, a release material or a resin diffusion member is further disposed on the reinforcing fiber base layer, or the release material and the resin diffusion member are arranged in that order. Alternatively, there is provided a method for forming a pipe joint, which is arranged in the reverse order.

  According to a third aspect of the present invention, in the second aspect, the release material is laid on the reinforcing fiber base layer, and the resin diffusion member is further laid on the release material. A method for forming a pipe joint is provided.

  According to a fourth invention of the present invention, there is provided a method for forming a pipe joint, characterized in that, in any one of the first to third inventions, the pipe joint has a cheese shape or an elbow shape. .

  According to the fifth invention of the present invention, in any one of the first to fourth inventions, the reinforcing fiber base is a plurality of sheets disposed along the outer peripheral surface of the pipe joint half-molding die. Each outer layer base material is arranged so that one end in the circumferential direction is bonded and the other end in the circumferential direction is overlapped with the outer surface of another adjacent outer layer base material. A method for forming a pipe joint is provided, wherein the pipe joint is stretched along a circumferential direction of a semi-cylindrical portion of a forming die.

  According to a sixth aspect of the present invention, in the fifth aspect, the plurality of outer layer base materials are arranged so that one end of each outer layer base material is surrounded by the other end of the other outer layer base material overlapped. A method for forming a joint for pipes is provided, wherein the pipe joints are arranged so that the positions of the directions are shifted.

  According to the molding method of the present invention, the measurement can be confirmed by directly touching whether the thickness is a predetermined thickness, the operation can be interrupted when trouble occurs before the resin is supplied, and the bag film is covered. Since the resin is injected into the resin, there is no vaporization and scattering of the solvent in the resin, the working environment is improved, and the generation of axial wrinkles that can be generated when molding with a rotary mold can be suppressed. Can be improved and the strength in the circumferential direction can be maintained.

It is a schematic diagram of the joint shape half-molding die for cheese shape pipes used for the shaping | molding method of this invention. It is a schematic diagram of the elbow-shaped pipe joint halving mold used in the molding method of the present invention. 3 is a schematic diagram of an example of a reinforcing fiber base used in the molding method of Example 1. FIG. 3 is a schematic diagram illustrating an example of an arrangement mode of various members used in the molding method of Example 1. FIG. 6 is a schematic diagram of another example of a reinforcing fiber base used in the molding method of Example 2. FIG. 6 is a schematic diagram showing an example of an arrangement mode of various members used in the molding method of Example 2. FIG. 6 is a schematic diagram of still another example of a reinforcing fiber base used in the molding method of Example 3. FIG.

  In the molding method of the present invention, first, a reinforcing fiber base material that is not impregnated with a resin is laminated at a predetermined position on a pipe joint half-molding mold (hereinafter also referred to as a half-molding mold) at a predetermined position. A base material layer is formed. Preferably, a release material or a resin diffusion member is further arranged on the reinforcing fiber base layer, or the release material and the resin diffusion member are arranged in that order or vice versa.

  Examples of the half-shaped mold include a cheese-shaped or elbow-shaped mold, and the half-shaped mold may be provided so as to be rotatable about the axial direction of the semi-cylindrical portion.

  Examples of the reinforcing fibers constituting the reinforcing fiber base include glass fibers, carbon fibers, and aramid fibers. Examples of the reinforcing fiber base include knitted fabrics such as glass cloth, carbon cloth, and kevlar cloth, and non-woven fabrics. Chopped strand mats, fiber stitching materials, reinforced fiber knitted fabrics and cotton-like sandwich materials, etc., and other sheet-like outer layer bases arranged along the outer peripheral surface of the half-molding die Each outer layer base material is arranged so that one end in the circumferential direction is bonded and the other end in the circumferential direction is overlapped with the outer surface of another adjacent outer layer base material, A material that is superposed along the circumferential direction of the cylindrical portion is also used, and in this case, the plurality of outer layer base materials are connected to one end of each outer layer base material and the other end of the other outer layer base material overlapped. Against Zhou The size is preferably arranged so that the direction of the position is shifted, and the size thereof is, for example, a size corresponding to a length that divides the outer peripheral length of the half mold from about 2 to 6 or higher order. And so on (for example, 8 to 16 divisions) so as to overlap each other.

The mold release material enhances the mold release property of the solidified injection resin, and a sheet made of the injection resin and a non-adhesive material is preferable.
The resin diffusion member promotes the diffusion of the injected resin, impregnates the injected resin into the reinforcing fiber base without unevenness, and allows the injected resin to diffuse throughout the desired range on the half mold, A net-like sheet material is preferable.
The resin diffusion member may not be used as long as it can be molded depending on conditions such as the type and thickness of the reinforcing fiber substrate.

  Next, the reinforcing fiber base layer is added or further added, and the release material and the resin diffusion member are airtightly covered with the bag film on the half mold. The bag film is not particularly limited as long as it is an airtight synthetic resin film material generally used in this type of vacuum injection molding method. And as for a bag film, it is preferable to stick a bag film to the surface of a half mold using the sealing material, such as an adhesive material, in the peripheral part of a half mold. Thereby, between a half mold and a bag film can be comprised as an airtight and airtight molded part.

Then, after connecting the decompression line that decompresses the inside of the bag film, that is, the interior covered with the bag film, and the injection line that injects the resin into the bag film, the fluid resin is sucked and injected into the bag film under reduced pressure. Then, the resin is solidified to form a pipe half joint member. Examples of the decompression line include those having a decompression suction port attached to a vacuum pump. As this injection resin, for example, a low-viscosity vinyl ester resin, unsaturated polyester resin, vinyl ester resin, epoxy resin, phenol resin, isocyanate resin, bismaleimide resin and the like are preferable. Examples of the injection line include those in which a resin injection port is connected to a connector for supplying resin from a resin storage tank, and those in which a resin injection hose is inserted into a bag film and in contact with a resin diffusion member. Is preferably carried out after confirming that a predetermined vacuum pressure has been reached and there are no wrinkles. After the resin is injected, heat is applied when a thermosetting resin is used, or the resin is cured and molded when a curing agent is added to the resin. In the case of using a thermoplastic resin, the resin warmed until it is liquefied is poured, and then the half mold is cooled to solidify the resin.
In this way, the pipe half joint member is formed.

  Furthermore, this pipe half joint member is used as a pair of upper and lower parts, and these are united. At that time, if such a part member is molded to the flange part, it may be fixed with bolts, nuts, etc. via a sealing material, adhesive, packing, etc., and only to the semi-cylindrical part. If not, the end portions are butted and the portions may be joined by vacuum injection molding or the like.

  Hereinafter, the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these drawings.

1 and 2 are schematic views of a pipe joint half-molding die used in the molding method of the present invention. FIG. 1 shows a cheese shape, and FIG. 2 shows an elbow shape.
The half mold of FIG. 1 is a mold having a shape obtained by halving a cheese-shaped pipe joint, and the half mold of FIG. 2 is a mold having a shape obtained by halving an elbow-shaped pipe joint.
3, 5, and 7 are schematic diagrams showing an example, another example, and yet another example of the reinforcing fiber base used in the molding method of the present invention using such a half mold. It is.

Example 1
First, the reinforcing fiber base 2 is disposed along the inner peripheral surface of the half mold 1.
Next, the release cloth 4 is disposed on the reinforcing fiber base 2 in an overlapping manner.
Further, a resin diffusion member 5 is disposed on the release cloth 4.

  An injection resin injection pipe 7 is disposed on the resin diffusion member 5. As the injection pipe 7, there is a rubber pipe or the like, which is passed through the bag film 6 and connected to the resin diffusion member 5. About the above aspect, a schematic diagram is shown in FIG.

  In addition, a decompression line is disposed in the molding portion covered with the bag film 6. The decompression line is connected to a decompression source via a hose such as a rubber tube. Further, a plurality of injection tubes 7 may be arranged on the resin diffusion member 5 at appropriate intervals according to the size of the half mold 1 and the like.

  Next, the half-molding mold 1 in which the release cloth 4, the resin diffusing member 5, and the injection tube 7 are disposed is covered with a bag film 6 in an airtight manner. Then, the bag film 6 is fixed to the surface of the half mold 1 on the peripheral edge of the half mold using a sealing material such as an adhesive or a seal tape. Thereby, between the half mold 1 and the bag film 6 can be comprised as an airtightly sealed molded part. In addition, a reduced pressure source that sucks and decompresses air in the molded part is connected to the molded part covered with the bag film 6.

  In the resin injection, the inner bag film 6 is depressurized by the connected vacuum source, and substantially vacuum state. At this time, it is confirmed that wrinkles are not generated in the laminated reinforcing fiber base 2. At this time, whether or not the reinforcing fiber base 2 has a predetermined thickness can be directly touched to measure and confirm. Further, if any failure by the confirmation may be modified to interrupt the work in the preceding stage of the resin injection.

  Then, in such a reduced pressure environment, the resin is injected from the injection tube 7, it is diffused inside the bag film 6 (forming portion). Injected resin is evenly spread over the entire via resin distribution member 5, to impregnate the reinforcing fiber substrate 2.

  When the resin injection is completed, the injected resin can be solidified while maintaining the reduced pressure state in the molded part, and thereby, the impregnation can be integrated with the reinforcing fiber material.

Next, the pipe half joint member formed in this way can form a desired pipe joint by combining the members with a pair facing each other.
In order to combine them, the flange portion is integrally formed, and a bolt insertion hole is formed at a predetermined position of the flange portion. Fix it to the flange with bolts and nuts via sealant, adhesive, packing, etc. At that time, the bolts and nuts are preferably made of resin in consideration of antiseptic properties, and the sealing material, adhesive, packing, etc. are preferably made of materials in consideration of chemical resistance and durability. In addition to bolts and nuts, rivets or the like may be used, and the pitch is determined based on the pipe internal pressure, flange portion rigidity, etc., but about 100 to 200 mm is appropriate.
In addition, when the flanges are not formed and the ends are abutted and joined, the number of reinforcing fiber bases is determined so that a predetermined strength and bonding force can be expressed, and hand lay-up / infusion is performed from the outer surface of the bonded portion. Overlay with molding.

(Example 2)
In FIG. 5, reference numeral 2 denotes a reinforcing fiber base disposed in the half mold 1, which is composed of an inner layer base 21 and an outer layer base 22, and the inner layer base 21 is a half mold. For example, a reinforcing fiber material is stitched into a chopped strand mat shape and is preferably a base material formed into a sheet shape. The inner layer base material 21 by the stitch base material of such a chopped strand mat has shape retention by the force of the stitch yarn, and is excellent in followability to the outer peripheral surface of the half mold. The outer layer base material 22 is a plurality of sheet-like materials disposed on the outer diameter side of the inner layer base material 21, and a roving formed by aligning fiber strands in which reinforcing fiber filaments are bundled is used as a weft. It is preferably a sheet-like fiber base material used as a woven or non-woven fabric.

  Of such reinforcing fiber base material 2, the inner layer base material 21 is first disposed along the peripheral surface of the half mold 1.

  Subsequently, as shown in FIGS. 5 and 6, a plurality of sheet-like outer layer base materials 22 are laminated in the circumferential direction along the outer peripheral surface of the half-molding die 1 while being wound in order.

The outer layer base material 22 is formed by cutting into a prescribed length according to the outer diameter of the half mold 1. In the illustrated embodiment, the outer layer base material 22 is cut into a size corresponding to a length obtained by dividing the outer peripheral length of the half mold 1 by about 2 to 6 parts, and the width of the outer layer base material 22 is set to the inner layer base material 21. Is formed in a rectangular shape having a size substantially equal to the width of the halves, and is overlapped in the circumferential direction of the half mold 1.
One end side in the circumferential direction of each layered outer layer base material 22 is bonded and fixed to the inner layer base material 21, and the other end side in the circumferential direction is not bonded to the inner layer base material 21.

  As shown in FIG. 5, the outer layer base material 22 is wound around the outer surface of the inner layer base material 21 wound earlier so as to dispose a plurality of outer layer base materials 22 in the circumferential direction. Specifically, one outer layer base material 22 is set in the circumferential direction along the outer peripheral surface of the half mold 1, and one end side in the circumferential direction of the outer layer base material 22 is set to the outer surface of the inner layer base material 21. Adhere to and fix. Further, the other end side in the circumferential direction of the outer layer base material 22 is not adhered, but is placed along the outer shape of the half mold 1 as it is. Similarly, the outer layer base material 22 to be subsequently disposed is bonded to the outer surface of another adjacent outer layer base material 22 without adhering the other end side to the inner layer base material 21 while adhering one end side thereof in the circumferential direction. It arrange | positions so that it may overlap. For arranging and fixing the reinforcing fiber base 2, spray glue or the like can be used for both the inner layer base 21 and the outer layer base 22.

  In this way, as shown in FIG. 6, a plurality of outer layer base materials 22 are overlaid on the outer surface of the inner layer base material 21. Outer layer base material 22, by a predetermined amount in the circumferential direction, while shifting the arrangement position, are stacked in this order. In stacking w (see FIG. 5) with other adjacent outer layer base materials 22 when the outer layer base material 22 is laminated, the length of 1/10 or more of the length of one outer layer base material 22 is set. It is desirable to ensure. In addition, the arrangement position where the outer layer base materials 22 are not overlapped and the end portions are in contact with each other or separated from each other is not preferable for obtaining the strength of the outer layer base material 22. Thereby, the predetermined thickness can be secured and the reinforcing fiber base 2 can be laminated.

  Next, the stretchable nonwoven fabric 3 is wound around the outer surface of the laminated outer layer base material 22, and the stretchable nonwoven fabric 3 is fixed by pressing a plurality of outer layer base materials 22 against the outer peripheral surface of the half mold 1. To be Although the outer layer base material 22 is bonded and fixed only at one end side in the circumferential direction, the outer layer base material 22 is pressed by the stretchable nonwoven fabric 3 and can stably maintain a laminated state. Moreover, since the other end side of the outer layer base material 22 in the circumferential direction is merely overlapped with the adjacent outer layer base material 22, the half mold 1 does not cause unnecessary wrinkles when it is wound with the nonwoven fabric 3. It is fixed along the outer periphery.

  Subsequently, the release cloth 4 is placed on the outer surface of the wound nonwoven fabric 3.

  Further, a resin diffusion member 5 is disposed on the outer surface of the wound release cloth 4.

  An injection resin injection tube 7 is disposed outside the resin diffusion member 5. The arrangement of the injection tube 7 is appropriate, but it is preferably provided near the tube bottom of the half mold 1. As the injection pipe 7, there is a rubber pipe or the like, which is passed through the bag film 6 and connected to the resin diffusion member 5. About the above aspect, a schematic diagram is shown in FIG.

  In addition, a decompression line is wound around the molded portion covered with the bag film 6. The decompression line is connected to a decompression source via a hose such as a rubber tube. Further, a plurality of such injection pipes 7 may be arranged on the outer surface of the resin diffusion member 5 at appropriate intervals according to the size of the half mold 1 and the like.

  Next, the half-molding mold 1 in which the release cloth 4, the resin diffusing member 5, and the injection tube 7 are disposed is covered with a bag film 6 in an airtight manner. Then, the bag film 6 is fixed to the surface of the half mold 1 on the peripheral edge of the half mold using a sealing material such as an adhesive or a seal tape. Thereby, between the half mold 1 and the bag film 6 can be comprised as an airtightly sealed molded part. In addition, a reduced pressure source that sucks and decompresses air in the molded part is connected to the molded part covered with the bag film 6.

  In the resin injection, the inner bag film 6 is depressurized by the connected vacuum source, and substantially vacuum state. At this time, it laminated reinforcing fiber substrate 2 (in particular, the outer layer base material 22) to ensure that wrinkles are not generated in. The outer layer base material 22 in a state in which a plurality of sheets are laminated is only fixed at one end side in the circumferential direction and not fixed at the other end side in the circumferential direction. Even if it acts so as to generate wrinkles in the base material 22, it is possible to escape the wrinkles to the non-adhered other end side of the outer layer base material 22, and as a result, generation of wrinkles can be effectively prevented. At this time, whether or not the reinforcing fiber base 2 has a predetermined thickness can be directly touched to measure and confirm. Also, if there is a problem as a result of confirmation, the operation can be interrupted and corrected at the stage before resin injection.

  Then, in such a reduced pressure environment, the resin is injected from the injection tube 7, it is diffused inside the bag film 6 (forming portion). The injected resin is uniformly diffused through the resin diffusion member 5 and impregnated into the nonwoven fabric 3 and the reinforcing fiber base 2.

  When the resin injection is completed, the injected resin can be solidified while maintaining the reduced pressure state in the molded part, and thereby, the impregnation can be integrated with the reinforcing fiber material.

Next, the pipe half joint member formed in this way can be molded into a desired pipe joint by combining the members with a pair facing each other in the same manner as in Example 1.
(Example 3)

  The method for forming a pipe joint described in the present embodiment has the same basic configuration as that of the second embodiment, and has a feature in the arrangement form of the outer layer base material 22 of the reinforcing fiber base material 2. The arrangement form is described in detail, and the other components are denoted by the same reference numerals as those in the second embodiment and description thereof is omitted.

  FIG. 7 is a schematic diagram showing another example of the reinforcing fiber base corresponding to FIG.

  In the present embodiment, a large number of sheet-like outer layer base materials 22 are laminated on the outer surface of the inner layer base material 21 disposed along the outer peripheral surface of the half mold 1 to form a multilayer structure. While increasing the thickness, a uniform outer peripheral surface is formed.

  In this case as well, a plurality of sheet-like outer layer base materials 22 are laminated one after another while shifting by a certain amount in the circumferential direction of the half mold 1. At this time, one end side in the circumferential direction of each outer layer base material 22 is adhered and fixed to the inner layer base material 21, and the other end side in the circumferential direction is not adhered to the inner layer base material 21 in Example 1. It is the same.

  As shown in FIG. 7, each outer layer base material 22 is overlapped on the outer surface of the inner layer base material 21 wound earlier, and when arranging a plurality of outer layer base materials 22 in the circumferential direction, other outer layers adjacent to each other. The overlap w with the base material 22 is larger than that in the second embodiment. That is, when one outer layer base material 22 is disposed, the amount of shifting with respect to the other adjacent outer layer base materials 22 is reduced, and a large overlapping area is ensured.

  In addition, in the laminated state of the outer layer base material 22 that is a multilayer, the end position of the outer layer base material 22 in the circumferential direction matches the end position of the outer layer base material 22 in any other layer in the circumferential direction. The form is not preferred because there is a risk of strength reduction in the matched part. Therefore, as shown in FIG. 7, one end portion a in the circumferential direction of any outer layer base material 22 and the other end portion b of any other outer layer base material 22 are shifted in the circumferential direction. Arrange as follows. And it is preferable to ensure a certain amount of overlap allowance w between the outer layer base materials 22 over the entire outer periphery of the half mold 1.

  Thereby, it is possible to easily stack a large number of outer layer base materials 22 to ensure the thickness, and to form a joint portion having an equal thickness. The stretchable nonwoven fabric 3 is wound around the outer surface of the outer layer base material 22 as a next step.

  When injecting the resin, the half-molding mold 1 provided with the nonwoven fabric 3 and the release cloth 4 is air-tightly covered with the bag film 6 in the same manner as in the second embodiment. The outer layer base material 22 in a state where a large number of sheets are laminated is only fixed at one end side in the circumferential direction, and is not fixed at the other end side in the circumferential direction. The cocoon can be released in the direction indicated by the arrow in FIG. 7 without producing the cocoon. As a result, generation of wrinkles can be effectively prevented. At this time, whether or not the reinforcing fiber base 2 has a predetermined thickness can be directly touched to measure and confirm. Further, if any failure by the confirmation may be modified to interrupt the work in the preceding stage of the resin injection.

  INDUSTRIAL APPLICABILITY The method of the present invention can produce a fiber reinforced resin pipe joint having no appearance of wrinkles, good appearance, and strength, and is very useful in industry.

DESCRIPTION OF SYMBOLS 1 Half mold 2 Reinforcement fiber base material 21 Inner layer base material 22 Outer layer base material 3 Nonwoven fabric 4 Release cloth 5 Resin diffusion member 6 Bag film 7 Injection tube

Claims (6)

  A reinforcing fiber base material layer is formed by laminating a reinforcing fiber base material on a pipe joint half mold, and this reinforcing fiber base layer is airtightly covered with a bag film on a pipe joint half mold, and a bag film. Connect the pressure reducing line that reduces the pressure to the vacuum state and the injection line that injects the resin into the bag film, inject the fluid resin into the bag film under reduced pressure, solidify the resin, and install the pipe half joint member formed, the molding method of pipe fittings, which comprises combining the pipe for half joint members to each other.   Furthermore, a mold release material or a resin diffusion member is arrange | positioned on a reinforced fiber base material layer, or a mold release material and a resin diffusion member are arrange | positioned in the order or the reverse order. Method.   The molding method according to claim 2, wherein a release material is laid on the reinforcing fiber base layer, and a resin diffusion member is further laid on the release material.   Molding method according to any one of claims 1 to 3 pipe fittings are of cheese-shaped or elbow shape.   The reinforcing fiber substrate includes a plurality of sheet-like outer layer substrates disposed along the outer peripheral surface of the pipe joint half-molding die, and each outer layer substrate is bonded to one end in the circumferential direction. 2. The other end of the halves is disposed so as to overlap the outer surface of another adjacent outer layer base material, and is overlapped along the circumferential direction of the semi-cylindrical portion of the half-molding die. The shaping | molding method in any one of -4.   The plurality of outer layer base materials are arranged such that one end of each outer layer base material is displaced in the circumferential direction with respect to the other end of the other outer layer base material overlapped. The forming method as described.

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