JP2018161809A - Method for manufacturing fiber-reinforced resin molded article and fiber-reinforced resin molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a fiber-reinforced resin molded article capable of preventing peeling of fiber-reinforced sheets arranged so as to be stacked on a joining part of a tubular resin pipe.SOLUTION: A method for manufacturing a fiber-reinforced resin molded article includes arranging steps (S1, S6), sealing steps (S2, S7), introducing steps (S4, S9), and curing steps (S5, S10). In the arranging steps (S1, S6), a plurality of fiber-reinforced sheets are arranged in stacked manner on an outer surface of a resin pipe, an anisotropic member for improving the fluidity of a matrix resin is arranged between layers of the fiber-reinforced sheets, end portions of the plurality of fiber-reinforced sheets are arranged stepwise, and the anisotropic member is arranged over a surface of the end portions structured stepwise between the layers of the fiber-reinforced sheets.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a method for producing a fiber reinforced resin molded product in which a fiber reinforced sheet disposed so as to cover the outer peripheral surface of a resin tube is cured in a state of being impregnated with a matrix resin and the resin tube is reinforced, and the fiber reinforced resin molded product About.

  Fiber reinforced resin molded products are widely used in various fields because of their light weight and high strength. And as a manufacturing method of a fiber reinforced resin molded product, infusion molding excellent in consideration for the environment is used.

  For example, in Patent Document 1, when forming a fiber reinforced resin molded article by coating a fiber reinforced sheet on an atypical joint of a cylindrical member, generation of wrinkles is caused by bonding and winding the fiber reinforced sheet in a windmill shape. A method of joining cylindrical members that can be prevented is disclosed.

JP 2011-79283 A

  However, the conventional fiber reinforced resin molded product has the following problems.

  That is, in the method disclosed in the above publication, in order to further improve the strength of the tubular member, when a plurality of fiber reinforced sheets are stacked to improve the reinforcing strength, a portion where a plurality of fiber reinforced sheets are stacked There is a possibility that the impregnation property of the matrix resin to the lowering of the fabric will cause the laminated fiber reinforced sheets to peel off.

  An object of the present invention is to provide a method for producing a fiber reinforced resin molded product and a fiber reinforced resin molded product capable of preventing the separation of the fiber reinforced sheet disposed on the joining portion of the cylindrical resin pipe. It is in.

  According to a first aspect of the present invention, there is provided a method of manufacturing a fiber-reinforced resin molded article, a cylindrical resin tube formed of a thermoplastic resin, and a reinforcement that is disposed so as to cover the outer surface of the resin tube and is impregnated with a matrix resin A fiber reinforced resin molded product comprising a fiber reinforced part including fibers, and includes the following steps. The arranging step arranges a plurality of fiber reinforced sheets serving as a base material for the fiber reinforced portion on the outer surface of the resin tube, and improves the fluidity of the matrix resin between the layers of the fiber reinforced sheet. Place. A sealing process seals the space containing the fiber reinforced sheet | seat and anisotropic member which were arrange | positioned in an arrangement | positioning process. In the introducing step, the matrix resin is introduced into the space sealed in the sealing step, and the fiber reinforced sheet and the anisotropic member are impregnated with the matrix resin. In the curing step, the matrix resin impregnated in the fiber reinforced sheet and the anisotropic member in the introducing step is cured. In the arranging step, the ends of the plurality of fiber reinforced sheets are arranged stepwise, and the anisotropic member is arranged across the surface of the ends arranged stepwise from the layers of the fiber reinforced sheets.

  Here, a manufacturing process (arrangement of a fiber reinforced resin molded article formed by impregnating a matrix resin into a fiber reinforced sheet and curing it in a state where a plurality of fiber reinforced sheets are laminated so as to cover the outer surface of the resin pipe In the step), an anisotropic member for improving the fluidity of the matrix resin is disposed between the layers of the plurality of fiber reinforced sheets disposed on the outer surface of the resin tube. And the anisotropic member is arrange | positioned over the surface of the edge part of the some fiber reinforced sheet | seat arrange | positioned stepwise from the interlayer of a fiber reinforced sheet | seat.

  Here, the anisotropic member is a member for promoting flow of the matrix resin in a specific direction in the step of introducing the matrix resin to be impregnated into the fiber reinforced sheet. For example, the anisotropic member is formed on the surface along the specific direction. A sheet-like member having irregularities is used.

  In addition, the fiber reinforced sheet is configured by laminating a plurality of sheets containing glass fibers, for example, and an anisotropic member may be disposed on the uppermost surface, or a single layer sheet containing glass fibers. The anisotropic member may be arrange | positioned on the surface.

  Furthermore, as the matrix resin impregnated in the fiber reinforced sheet, for example, a thermosetting resin can be used.

  Thereby, since the anisotropic member which promotes the flow of the matrix resin in a specific direction is provided in a state of being exposed on the surface of the end portion of the fiber reinforced sheet arranged stepwise, the matrix resin is conventionally used. It is possible to improve the fluidity in a specific direction that is difficult to flow.

  As a result, the matrix resin can be sufficiently impregnated along a specific direction from the interlayer of the fiber reinforced sheet to the stepped end, thereby preventing the fiber reinforced sheet from peeling off.

  A method for manufacturing a fiber-reinforced resin molded product according to the second invention is a method for manufacturing a fiber-reinforced resin molded product according to the first invention, wherein the anisotropic member includes a plurality of main fiber bundles and a plurality of auxiliary members. Fiber bundle. The plurality of main fiber bundles are arranged in parallel to the weft direction. The auxiliary fiber bundles are arranged along a radial direction intersecting the weft direction, and the main fiber bundles are integrated with a predetermined interval.

  Here, as the anisotropic member, a plurality of main fiber bundles are arranged in parallel in the weft direction, and a plurality of auxiliary fiber bundles connecting the plurality of main fiber bundles through a predetermined interval are arranged in the radial direction. Non-crimp fabric is used.

  Thereby, between the surface of the anisotropic member and the back surface of the fiber reinforced sheet laminated thereon, the matrix resin is disposed along the groove portion (concave portion) formed by the main fiber bundle (convex portion). A gap that flows is formed.

  At this time, it is preferable that the groove part (concave part) of an anisotropic member is arrange | positioned in the direction which cross | intersects with the edge | side of the edge part of a fiber reinforced sheet. By disposing in such a crossing direction, the matrix resin can flow to the center of the fiber reinforced sheet. The intersecting angle may be in the range of 85 ° to 95 °, and is preferably orthogonal.

  As a result, the flowability of the matrix resin in the specific direction can be improved by arranging the main fiber bundles (the weft direction) along the specific direction.

  The manufacturing method of the fiber reinforced resin molded product according to the third invention is the manufacturing method of the fiber reinforced resin molded product according to the first or second invention, and the matrix resin is a thermosetting resin.

  Here, a thermosetting resin is used as the matrix resin impregnated in the fiber reinforced sheet constituting the fiber reinforced portion.

  Here, as the thermosetting resin, for example, unsaturated polyester resin, acrylic resin, vinyl ester resin, alkyd resin, amino resin, epoxy resin, urethane resin, phenol resin, and silicon resin can be used.

  Thereby, the matrix resin impregnated in the fiber reinforced sheet in the introducing step can be easily cured.

  A method for manufacturing a fiber-reinforced resin molded product according to a fourth invention is a method for manufacturing a fiber-reinforced resin molded product according to any one of the first to third inventions, and in the arranging step, A plate-like diffusion member for diffusing the matrix resin in the circumferential direction of the resin pipe is arranged along the end portions arranged in a stepped manner.

  Here, a plate-like diffusion member is arranged along the end portion of the fiber reinforced sheet arranged in a step shape.

  Thereby, the matrix resin introduced into the sealed space in the introducing step flows in the circumferential direction of the resin tube along the end portion of the fiber reinforced sheet by the diffusion member.

  As a result, the flow of the matrix resin in the circumferential direction of the resin tube can be promoted, and the fiber reinforced sheet can be sufficiently impregnated with the matrix resin.

  The manufacturing method of the fiber reinforced resin molded article which concerns on 5th invention is a manufacturing method of the fiber reinforced resin molded article which concerns on 4th invention, Comprising: A diffusion member is a thermoplastic resin.

  Here, in order to improve the fluidity of the matrix resin in the circumferential direction of the resin tube, the diffusion member provided along the end portion of the fiber reinforced sheet arranged in a step shape is formed of a thermoplastic resin.

  Thereby, after the matrix resin is cured, the diffusion member is less likely to be crushed when the pressure is reduced by using the thermoplastic resin as the material of the plate-like diffusion member to be removed. For this reason, while maintaining shape followability, the space (resin way) for encouraging the flow of matrix resin under a decompression environment can be secured.

  As a result, further flow of the matrix resin passing through the diffusion member to the anisotropic sheet can be promoted. Furthermore, since the diffusing member is formed using a thermoplastic resin, the diffusing member can be easily peeled off from the finished fiber-reinforced resin molded product, and the aesthetic appearance of the finished product can be maintained.

  The method for producing a fiber-reinforced resin molded product according to the sixth invention is a method for producing a fiber-reinforced resin molded product according to the fourth or fifth invention, wherein the diffusion member is attached to the end portion, It has a surface having releasability.

  Here, the surface which has mold release property is provided in the surface at the edge part side of the fiber reinforced sheet in a plate-shaped diffusion member.

  Here, the surface having releasability may be formed by a release sheet, or may have releasability by surface treatment.

  Thus, the diffusion member can be easily removed after the matrix resin is cured.

  A fiber-reinforced resin molded product according to a seventh aspect includes a cylindrical resin tube, a fiber reinforced portion, and an anisotropic member. The cylindrical resin tube is made of a thermoplastic resin. The fiber reinforced portion is arranged so as to cover the outer surface of the resin tube, and includes a plurality of fiber reinforced sheets cured in a state of being impregnated with the matrix resin. An anisotropic member is arrange | positioned between the layers of the fiber reinforced sheet laminated | stacked by two or more sheets, and assists the fluidity | liquidity of a matrix resin. The ends of the plurality of fiber reinforced sheets attached to the outer surface of the resin tube are arranged in a staircase shape, and the anisotropic member is arranged in a stepped manner from the interlayer of the fiber reinforced sheets. It is arranged over the surface.

  Here, in a fiber reinforced resin molded product in which a fiber reinforced sheet is impregnated with a matrix resin and cured in a state in which a plurality of fiber reinforced sheets are laminated so as to cover the outer surface of the resin tube, on the outer surface of the resin tube An anisotropic member that improves the fluidity of the matrix resin is disposed between the layers of the plurality of fiber reinforced sheets that are stacked. And the anisotropic member is arrange | positioned over the surface of the edge part of the some fiber reinforced sheet | seat arrange | positioned stepwise from the interlayer of a fiber reinforced sheet | seat.

  Here, the anisotropic member is a member for promoting flow of the matrix resin in a specific direction in the step of introducing the matrix resin to be impregnated into the fiber reinforced sheet. For example, the anisotropic member is formed on the surface along the specific direction. A sheet-like member having irregularities is used.

  In addition, the fiber reinforced sheet is configured by laminating a plurality of sheets containing glass fibers, for example, and an anisotropic member may be disposed on the uppermost surface, or a single layer sheet containing glass fibers. The anisotropic member may be arrange | positioned on the surface.

  Furthermore, as the matrix resin impregnated in the fiber reinforced sheet, for example, a thermosetting resin can be used.

  Thereby, since the anisotropic member which promotes the flow of the matrix resin in a specific direction is provided in a state of being exposed on the surface of the end portion of the fiber reinforced sheet arranged stepwise, the matrix resin is conventionally used. It is possible to improve the fluidity in a specific direction that is difficult to flow.

  As a result, the matrix resin can be sufficiently impregnated along a specific direction from the interlayer of the fiber reinforced sheet to the stepped end, thereby preventing the fiber reinforced sheet from peeling off.

  A fiber-reinforced resin molded product according to an eighth invention is a fiber-reinforced resin molded product according to the seventh invention, wherein the anisotropic member has a plurality of main fiber bundles and a plurality of auxiliary fiber bundles. ing. The plurality of main fiber bundles are arranged in parallel to the weft direction. The auxiliary fiber bundles are arranged along a radial direction intersecting the weft direction, and the main fiber bundles are integrated with a predetermined interval.

  Here, as the anisotropic member, a plurality of main fiber bundles are arranged in parallel in the weft direction, and a plurality of auxiliary fiber bundles connecting the plurality of main fiber bundles through a predetermined interval are arranged in the radial direction. Non-crimp fabric is used.

  Thereby, between the surface of the anisotropic member and the back surface of the fiber reinforced sheet laminated thereon, the matrix resin is disposed along the groove portion (concave portion) formed by the main fiber bundle (convex portion). A gap that flows is formed.

  As a result, the flowability of the matrix resin in the specific direction can be improved by arranging the main fiber bundles (the weft direction) along the specific direction.

  The fiber reinforced resin molded product according to the ninth invention is the fiber reinforced resin molded product according to the seventh or eighth invention, and the matrix resin is a thermosetting resin.

  Here, a thermosetting resin is used as the matrix resin impregnated in the fiber reinforced sheet constituting the fiber reinforced portion.

  Here, as the thermosetting resin, for example, unsaturated polyester resin, acrylic resin, vinyl ester resin, alkyd resin, amino resin, epoxy resin, urethane resin, phenol resin, and silicon resin can be used.

  Thereby, the matrix resin impregnated in the fiber reinforced sheet in the introducing step can be easily cured.

  According to the method for manufacturing a fiber-reinforced resin molded product according to the present invention, it is possible to prevent a plurality of fiber-reinforced sheets from being peeled and wound around a joint portion of a cylindrical resin tube.

The perspective view which shows the structure of the resin pipe containing the main pipe and branch pipe used as the base part of the fiber reinforced resin molded product which concerns on one Embodiment of this invention. The perspective view which shows the state at the time of a fiber reinforced sheet being wound around the resin pipe | tube of FIG. The perspective view which shows the overlapping state of the fiber reinforced sheet wound by the resin pipe | tube shown in FIG. The top view which shows the overlap part in the state by which the fiber reinforced sheet was wound around the resin pipe | tube of FIG. (A) is a sectional side view of the overlap part of the fiber reinforced sheet | seat shown in FIG. (B) is an expanded sectional view of A part of (a). The perspective view which shows the four glass fiber sheets and anisotropic member which comprise the fiber reinforced sheet | seat shown in FIG.5 (b). The enlarged view of the B section of FIG. The top view which shows the structure of the infusion molding system for manufacturing the fiber reinforced resin molded product shown in FIG. The flowchart which shows the flow of the manufacturing method of the fiber reinforced resin molded product shown in FIG. The figure which shows the relationship of the ratio of the thickness of a branch pipe with respect to the thickness from the outer surface of a branch pipe to the outermost surface of a fiber reinforced sheet. The perspective view which shows the structure of the substantially L-shaped resin pipe used as the base of the fiber reinforced resin molded product which concerns on other embodiment of this invention.

  It will be as follows if the manufacturing method of the fiber reinforced resin molded product which concerns on one Embodiment of this invention is demonstrated using FIGS.

(Fiber-reinforced resin molded product 30)
The fiber reinforced resin molded product 30 according to the present embodiment has a part of the outer surface of the branch pipe (resin pipe) 10 shown in FIG. 1 into eight fiber reinforced sheets 21a to 21d and 22a to 22d shown in FIG. It is fixed so as to cover in a state impregnated with resin, and is used as a joint.

  As shown in FIG. 1, the branch pipe 10 is a resin pipe having a substantially T shape in plan view, and constitutes a base portion of the fiber reinforced resin molded product 30.

The detailed configuration of the branch pipe 10 will be described in detail later.
As shown in FIG. 2, the fiber reinforced portions 21 and 22 are provided to reinforce the branch portion in the branch pipe 10. The fiber reinforced portions 21 and 22 are formed by curing the four fiber reinforced sheets 21a to 21d and the four fiber reinforced sheets 22a to 22d, respectively, impregnated with a matrix resin described later.

  The matrix resin is a resin that has fluidity to be impregnated into the fiber reinforced sheets 21a to 21d and 22a to 22d and is easily cured after the impregnation. For example, an unsaturated polyester resin (thermosetting resin) is used. Can do.

The detailed configuration of the fiber reinforced portions 21 and 22 will be described in detail later.
(Branch pipe 10)
The branch pipe 10 is, for example, a cylindrical resin pipe having a diameter of 300 mm to 1500 mm, and includes a cylindrical main pipe 11 and a cylindrical branch pipe 12 as shown in FIG.

  The material of the branch pipe 10 is not particularly limited as long as it is a resin. For example, thermoplastic resins such as polyolefin (polyethylene, polypropylene, etc.) and polyvinyl chloride can be used.

  The main pipe 11 is a part that functions as a main pipe part in the branch pipe 10, and is disposed along a substantially horizontal direction in FIG. 1 and has an axis X1.

  The branch pipe 12 is a branch pipe portion formed so as to branch from a substantially central portion in the longitudinal direction of the main pipe 11, and is arranged along a substantially vertical direction in FIG. 1 and has an axis X2. Yes.

  Here, as shown in FIG. 1, in the resin pipe shaped like the branch pipe 10 including the branch pipe 12 branched from the main pipe 11, the strength in the vicinity of the connecting portion between the main pipe 11 and the branch pipe 12 is reinforced. It may be required to do.

  In the branch pipe 10, when the surface including the axis X1 of the main pipe 11 and the axis X2 of the branch pipe 12 is a center plane D, the outer surface reinforced by the fiber reinforced sheets 21a to 21d and 22a to 22d in the branch pipe 10 is The region is divided into two regions by the center plane D. The outer surface of the branch pipe 10 divided into two includes one outer surface (first covering surface) 13a and the other outer surface (second covering surface) 13b (dot portion in FIG. 2). Configured as follows.

  Therefore, in the fiber reinforced resin molded product 30 of the present embodiment, one outer surface 13a is fixed so as to be covered with the fiber reinforced portion 21, and the other outer surface 13b is fixed so as to be covered with the fiber reinforced portion 22. Is done.

(Fiber reinforced parts 21, 22)
As shown in FIG. 2, the fiber reinforced portions 21 and 22 are cured in a state in which the fiber reinforced sheets 21 a to 21 d and 22 a to 22 d containing fibers are impregnated with a matrix resin, so that the main pipe 11 in the branch pipe 10 and The connecting portion with the branch pipe 12 is strengthened. That is, the fiber reinforced sheets 21a to 21d and 22a to 22d serve as base materials constituting the fiber reinforced portions 21 and 22.

  The fiber reinforced sheets 21a to 21d and the fiber reinforced sheets 22a to 22d are configured by combining four substantially square glass fiber sheets (fiber reinforced sheets) 21aa to 21ad (see FIGS. 5B and 6). Has been.

  In addition, as a fiber contained in the fiber reinforced sheets 21a-21d and 22a-22d, a glass fiber can be used, for example. Further, the fiber reinforced sheets 21a to 21d and 22a to 22d may be woven fabrics or non-woven fabrics.

  As shown in FIG. 5B, the fiber reinforced portion 21 is configured by laminating three fiber reinforced sheets 21a. In addition, anisotropic sheets (anisotropic members) 31 are disposed on the upper surfaces of the three fiber reinforced sheets 21a, respectively.

  Furthermore, the fiber reinforced part 21 reinforces one outer surface of the branch pipe 10 by being fixed so as to cover the outer surface 13a side of the outer surface of the branch pipe 10 described above. And as shown in FIG. 2, the fiber reinforced part 21 is a fiber reinforced sheet 21a fixed so as to cover the branch pipe 12 part, and a fiber reinforced sheet 21b to 21d fixed so as to cover the main pipe 11 part, have.

  The fiber reinforced sheet 21a is a substantially rectangular sheet containing glass fibers, and is configured by stacking four glass fiber sheets 21aa to 21ad (see FIG. 5B and FIG. 6). And the fiber reinforced sheet 21a is first covered on the outer surface of the branch pipe 10 among the fiber reinforced sheets 21a to 21d in the manufacturing process described later. More specifically, as shown in FIG. 3, the fiber reinforced sheet 21 a is disposed on the side of the branch pipe 12 in the vicinity of the connecting portion between the main pipe 11 and the branch pipe 12.

  Moreover, as shown in FIG.5 (b), the fiber reinforcement sheet | seat 21a is the state laminated | stacked, and the edge part is arrange | positioned stepwise. That is, in this embodiment, as shown in FIG. 6, the fiber reinforced sheet 21 a is configured by stacking four glass fiber sheets 21 aa to 21 ad, and three pieces are provided on the outer surface of the branch pipe 10. (Three sets of four glass fiber sheets 21aa to 21ad are arranged).

  At the end portion of the fiber reinforced sheet 21a arranged in a staircase shape, as shown in FIG. 5B, the anisotropic sheet 31 is arranged on the top surface of the staircase shape. At this time, it is preferable that the length (protrusion width) which protrudes from the edge part of the fiber reinforced sheet | seat 21a laminated | stacked on the anisotropic sheet | seat 31 is the range of 0.5-30 mm. Among them, the range of 3 to 25 mm is more preferable, and the range of 5 to 15 mm is particularly preferable.

  Here, the anisotropic sheet 31 is disposed on the uppermost surface of the fiber reinforced sheet 21a (four glass fiber sheets 21aa to 21ad) shown in FIG.

  That is, in the fiber reinforced resin molded product 30 of the present embodiment, as shown in FIG. 6, a fiber reinforced sheet 21 a including four glass fiber sheets 21 aa to 21 ad and an anisotropic sheet 31 disposed on the upper surface thereof. As one unit, three units are stacked on the outer surface of the branch pipe 10.

As shown in FIG. 7, the anisotropic sheet 31 has irregularities on the surface.
Specifically, convex portions 31a and concave portions 31b are arranged along the flow direction of the matrix resin shown in FIGS.

  Thereby, when the fiber reinforced sheet 21a is laminated | stacked, a clearance gap is formed in the part of the recessed part 31b between the surface of the anisotropic sheet 31, and the back surface of the fiber reinforced sheet 21a.

  Therefore, when the matrix resin is introduced, the matrix resin can be made to flow along the gaps of the recesses 31b of the anisotropic sheet 31.

  As a result, the fluidity of the matrix resin in the overlapping portion 23a between the fiber reinforced sheet 21a and the fiber reinforced sheet 21d, which has been difficult to flow in the past, is improved, and the fiber reinforced sheet 21a is sufficiently impregnated with the matrix resin and cured. Can be made.

  And the both ends of the fiber reinforced sheet 21a become free ends, and are arranged along the outer surface of the branch pipe 12, so that both ends are stepped as shown in FIG. 5 (b). be able to.

  The other fiber reinforced sheets 21b to 21d and the fiber reinforced sheets 22a to 22d have the same configuration as that of the fiber reinforced sheet 21a, and the same effect can be obtained. .

  The fiber reinforced sheet 21b is configured by laminating four glass fiber sheets, similarly to the fiber reinforced sheet 21a. And the fiber reinforced sheet | seat 21b is a substantially rectangular sheet | seat containing glass fiber, Comprising: In the manufacturing process mentioned later, it covers on the outer surface of the branch pipe 10 2nd among the four fiber reinforced sheets 21a-21d. . More specifically, as shown in FIG. 3, the fiber reinforced sheet 21 b is disposed on the main pipe 11 side in the vicinity of the connecting portion between the main pipe 11 and the branch pipe 12 and on the left side in FIG. 2.

  The fiber reinforced sheet 21c is configured by stacking four glass fiber sheets in the same manner as the fiber reinforced sheets 21a and 21b. And the fiber reinforced sheet | seat 21c is a substantially rectangular sheet | seat containing glass fiber, Comprising: In the manufacturing process mentioned later, it covers on the outer surface of the branch pipe 10 3rd among the four fiber reinforced sheets 21a-21d. . More specifically, as shown in FIG. 3, the fiber reinforced sheet 21 c is arranged on the main pipe 11 side in the vicinity of the connecting portion between the main pipe 11 and the branch pipe 12, and on the right side in FIG. 2.

  The fiber reinforced sheet 21d is configured by laminating four glass fiber sheets in the same manner as the fiber reinforced sheets 21a, 21b, and 21c. And the fiber reinforced sheet | seat 21d is a substantially rectangular sheet | seat containing glass fiber, Comprising: In the manufacturing process mentioned later, among the four fiber reinforced sheets 21a-21d, the outer surface (main pipe | tube 11 and last) (Near the connecting portion with the branch pipe 12). More specifically, as shown in FIGS. 2 and 3, the fiber reinforced sheet 21d is disposed on the connecting portion between the main pipe 11 and the branch pipe 12 and at a position directly below the branch pipe 12 in FIG. The

  In addition, in the part where each fiber reinforced sheet 21a-21d mutually adjoins, as shown in FIG. 4, the part (overlapping part 23a etc.) overlapped with each other is formed.

  As shown in FIG. 4, the overlapping portion 23 a is arranged so that the end portion of the fiber reinforced sheet 21 d arranged last is superimposed on the fiber reinforced sheet 21 a arranged first on the outer surface of the branch pipe 10. It is an arranged part.

  In the present embodiment, in order to improve the flowability of the matrix resin in the overlapping portion 23a that has been difficult to sufficiently impregnate the matrix resin in the past, in the manufacturing process, the anisotropic sheet 31 and the diffusion member 32 described above are used. And are used.

  As shown in FIG. 5B, the anisotropic sheet 31 is disposed on the upper surface of the fiber reinforced sheet 21a. And the anisotropic sheet | seat 31 is arrange | positioned over the surface of the edge part arrange | positioned stepwise from the interlayer of the three laminated fiber reinforced sheets 21a.

  Further, as shown in FIG. 7, a plurality of convex portions 31 a and a plurality of concave portions 31 b are formed on the surface of the anisotropic sheet 31 substantially in parallel with the flow direction of the matrix resin.

  A plurality of convex portions 31a are arranged at a predetermined interval (width dimension of the concave portion 31b), and abut against the back side of the upper fiber reinforced sheet 21a when a plurality of fiber reinforced sheets 21a are stacked.

  A plurality of the concave portions 31b are arranged with a predetermined interval (width dimension of the convex portion 31a), and are formed between the back surfaces of the upper fiber reinforced sheets 21a when a plurality of the fiber reinforced sheets 21a are stacked. It becomes a gap.

  Thereby, matrix resin can be made to flow in a specific direction via the recessed part 31b of the anisotropic sheet | seat 31 exposed in the edge part arrange | positioned stepwise of the laminated fiber reinforced sheet | seat 21a.

  As the anisotropic sheet 31, a plurality of main fiber bundles (convex portions 31a) arranged in parallel to the weft direction corresponding to the flow direction of the matrix resin and the radial direction intersecting with the weft direction are arranged. A non-crimp fabric or the like having a plurality of auxiliary fiber bundles that integrate the main fiber bundles at predetermined intervals can be used.

  The diffusing member 32 is a plate-like member formed of a thermoplastic resin, and covers the end portions of the fiber reinforced sheets 21a laminated in a step shape as shown in FIG. 5B. So as to be arranged along the end. And the diffusing member 32 is formed along the circumferential direction of the branch pipe 10 (the paper surface in FIG. 5B) along the gap between the end portion of the fiber reinforced sheet 21a and the like arranged in a staircase pattern and the surface facing this. The matrix resin is diffused in the direction perpendicular to

  The diffusion member 32 is removed after being cured in a state where the fiber reinforced sheet 21a is impregnated with the matrix resin.

  Thereby, the contact surface of the hardened matrix resin that has been in contact with the release surface of the diffusion member 32 can be formed as a tapered end surface 25 having a desired angle.

  Moreover, the surface of the diffusion member 32 on the side facing the stepped end of the fiber reinforced sheet 21a has releasability.

  For example, a release sheet such as a Teflon (registered trademark) sheet may be attached to the surface having releasability in the diffusing member 32, or a surface treatment for giving releasability may be performed. .

  Thereby, after making the fiber reinforced sheet 21a etc. impregnate a matrix resin and making it harden | cure, the diffusion member 32 can be removed easily.

  In the present embodiment, as described above, when the fiber reinforced sheets 21a to 21d are impregnated with the matrix resin, the matrix resin is sufficiently applied to the fiber reinforced sheets 21a to 21d using the anisotropic sheet 31 and the diffusion member 32. Can be impregnated.

  Therefore, it can prevent that the fiber reinforced sheets 21a-21d peel on the lamination surface.

  Further, in order to improve the adhesion between the surface of the anisotropic sheet 31 and the polyolefin resin tube, the surface of the polyolefin resin tube is subjected to surface treatment by sanding, plasma treatment, ashing treatment, etc. May be provided. Then, for example, after applying a polyolefin-based primer to the branch pipe 10 whose surface has been roughened, the fiber reinforced sheet 21a is attached to the upper surface, thereby improving the adhesion to the fiber reinforced sheet 21a (glass fiber sheet 21aa). be able to.

  The fiber reinforced portion 22 reinforces the other outer surface of the branch pipe 10 by being fixed so as to cover the outer surface 13b side of the outer surface of the branch pipe 10 described above. As shown in FIG. 2, the fiber reinforced portion 22 includes a fiber reinforced sheet 22a that is fixed so as to cover the branch pipe 12 portion, and three fiber reinforced sheets 22b that are fixed so as to cover the main pipe 11 portion. 22d.

  In the fiber reinforced resin molded product 30 of the present embodiment, after the fiber reinforced sheets 21a to 21d described above are fixed on the outer surface 13a, the fiber reinforced sheets 22a to 22d are covered on the outer surface 13b. In this state, the matrix resin is impregnated and fixed on the outer surface 13b.

  The fiber reinforced sheet 22a is a substantially rectangular sheet containing glass fibers, and is configured by laminating four glass fiber sheets. And the fiber reinforced sheet 22a is first covered on the outer surface of the branch pipe 10 among the fiber reinforced sheets 22a to 22d in the manufacturing process described later. More specifically, the fiber reinforced sheet 22a is disposed on the side of the branch pipe 12 in the vicinity of the connecting portion between the main pipe 11 and the branch pipe 12, similarly to the fiber reinforced sheet 21a.

  Similar to the fiber reinforced sheet 22a, the fiber reinforced sheet 22b is configured by laminating four glass fiber sheets. And the fiber reinforced sheet | seat 22b is a substantially rectangular sheet | seat containing glass fiber, Comprising: In the manufacturing process mentioned later, it covers on the outer surface of the branch pipe 10 2ndly among the four fiber reinforced sheets 22a-22d. . More specifically, the fiber reinforced sheet 22b is disposed on the main pipe 11 side in the vicinity of the connecting portion between the main pipe 11 and the branch pipe 12, similarly to the fiber reinforced sheet 21b.

  Similar to the fiber reinforced sheets 22a and 22b, the fiber reinforced sheet 22c is configured by laminating four glass fiber sheets. And the fiber reinforced sheet | seat 22c is a substantially rectangular sheet | seat containing glass fiber, Comprising: In the manufacturing process mentioned later, it covers on the outer surface of the branch pipe 10 3rd among the four fiber reinforced sheets 22a-22d. . More specifically, the fiber reinforced sheet 22c is disposed on the main pipe 11 side in the vicinity of the connecting portion between the main pipe 11 and the branch pipe 12, similarly to the fiber reinforced sheet 21c.

  The fiber reinforced sheet 22d is configured by laminating four glass fiber sheets in the same manner as the fiber reinforced sheets 22a, 22b, and 22c. And the fiber reinforced sheet 22d is a substantially rectangular sheet containing glass fibers, and in the manufacturing process to be described later, the outer surface of the branch pipe 10 (the main pipe 11 and the last) among the four fiber reinforced sheets 22a to 22d. (Near the connecting portion with the branch pipe 12). More specifically, the fiber reinforced sheet 22d is disposed on the connecting portion between the main pipe 11 and the branch pipe 12 in the same manner as the fiber reinforced sheet 21d.

  In addition, although detailed description is abbreviate | omitted, in the part which each fiber reinforced sheet | seat 22a-22d mutually adjoins, the part which mutually overlap | superposed is formed similarly to the part which the fiber reinforced sheet | seats 21a-21d mutually adjoined. Shall.

  Here, as described above, the fiber reinforced sheets 22a to 22d are fixed on the remaining outer surface 13b after the fiber reinforced sheets 21a to 21d are fixed on the outer surface 13a divided into two.

  At this time, in a state where the fiber reinforced sheets 21a to 21d and 22a to 22d are fixed to the outer surface of the branch pipe 10, overlapping portions (overlapping portions) are formed.

  The overlapping portion is on the fiber reinforced sheet 21a at the boundary portion between the outer surfaces 13a and 13b where the center plane D including the axis X1 of the main pipe 11 and the axis X2 of the branch pipe 12 and the outer surface of the branch pipe 10 intersect. The fiber reinforced sheet 22a is disposed so that the end portions thereof overlap each other. The overlapping portion becomes a free end of the fiber reinforced sheet 21a and the fiber reinforced sheet 22a when performing infusion molding described later.

  In this embodiment, as a method of fixing the above-described fiber reinforced sheets 21a to 21d and 22a to 22d to the outer surface of the branch pipe 10, a matrix resin is used as the fiber reinforced sheet 21a by using an infusion molding system 40 described later. A method of impregnating ˜21d and 22a to 22d and curing is used.

  In addition, as shown in FIG. 5A, the fiber reinforced resin molded product 30 of the present embodiment is inclined with respect to the outer surface of the branch pipe 10 at an overlapping portion 23a between the fiber reinforced sheet 21a and the fiber reinforced sheet 21d. Is provided with an end face 25.

  As shown in FIGS. 5A and 5B, the end surface 25 is formed by stacking three fiber reinforced sheets 21 a including four glass fiber sheets 21 aa to 21 ad in the thickness direction so as to be the outer surface of the branch pipe 12. When arranged on the top, the fiber reinforced sheet 21a is formed by being impregnated with a matrix resin in a state where the free ends are arranged stepwise.

  Thereby, it is possible to effectively prevent the occurrence of cracks by avoiding stress concentration without forming an acute angle portion at the end of the fiber reinforced sheet 21a. As a result, it is possible to effectively prevent the strength reduction of the portion reinforced by the fiber reinforced sheet 21a.

  Here, the angle of the end face 25 with respect to the outer surface of the branch pipe 10 is preferably in the range of 10 ° to 85 °. Among them, the range of 30 ° to 60 ° is more preferable, and the range of 30 ° to 40 ° is particularly preferable.

As described above, the end face 25 is formed by the diffusion member 32 shown in FIG.
The ratio of the thickness of the branch pipe 10 to the thickness from the outer surface of the branch pipe 10 to the outermost surface of the plurality of fiber reinforced sheets 21a to 21d is preferably 30% to 90%, and more preferably 35% to 80%. Preferably, as shown in FIG. 10, 40% to 70% is particularly preferable.

  When the thickness is less than 30%, the strength of the branch pipe 10 tends to be significantly reduced. Moreover, if it exceeds 90%, the rebounding force of the fiber reinforced sheets 21a to 21d tends to increase and float. For this reason, the fiber reinforced sheets 21 a to 21 d are not easily along the branch pipe 10.

  As a result, even if the matrix resin is impregnated, the adhesiveness is lowered, so that the aesthetic appearance as a final product is deteriorated and it is difficult to improve the strength.

  In FIG. 10, OD means an outside diameter, and SDR means a ratio between a standard outside diameter and a minimum thickness (Standard Dimension Ratio).

(Infusion molding system 40)
As shown in FIG. 8, the infusion molding system 40 includes an airtight film 41, sealing materials 42 a and 42 b, an inlet, a decompression device 44, and a spiral member 45.

  The airtight film 41 is used to cover the outer surface of the branch pipe 10 in a state covered with the fiber reinforced sheets 21a to 21d and 22a to 22d.

  Thereby, the space between the outer surfaces 13 a and 13 b formed by the airtight film 41 can be decompressed by the decompression device 44.

  The sealing material 42a is an introduction side provided for introducing a matrix resin into a space between the airtight film 41 and the outer surfaces 13a and 13b of the branch pipe 10 covered with the airtight film 41, As shown in FIG. 8, the main pipe 11 and the branch pipe 12 are arranged on the inlet side provided at a total of three locations, that is, at both ends of the branch pipe 12.

  The sealing material 42 b is disposed on the suction port side in order to seal the space between the airtight film 41 and the outer surfaces 13 a and 13 b of the branch pipe 10 covered with the airtight film 41. And the sealing material 42b seals the space between the outer surfaces 13a and 13b of the branch pipe 10 covered with the airtight film 41 while not introducing the matrix resin. And the sealing material 42b is arrange | positioned so that the circumference | surroundings of the inlet provided in the approximate center of the main pipe 11 may be covered, as shown in FIG.

  The resin introduction device (for example, a hose or the like) is an airtight film 41 and an outer surface 13a of the branch pipe 10 covered with the airtight film 41 in a manufacturing method (infusion molding) of a fiber reinforced resin molded product 30 described later. The matrix resin is introduced from a total of three locations, both ends of the main pipe 11 and the ends of the branch pipe 12, in a state where the space between the pipes 13b is reduced.

  Here, as the matrix resin introduced by the resin introduction device, for example, a thermosetting resin such as an unsaturated polyester resin can be used.

  As shown in FIG. 8, one decompressor 44 is provided so as to correspond to the exhaust port provided in the center of the main pipe 11. And the decompression device 44 is between the airtight film 41 and the outer surfaces 13a and 13b of the branch pipe 10 covered with the airtight film 41 before introducing the matrix resin through the exhaust port. Depressurize the space.

  At this time, the space between the airtight film 41 and the outer surfaces 13a and 13b of the branch pipe 10 covered with the airtight film 41 is sealed by the sealing materials 42a and 42b.

  Therefore, the decompression device 44 includes the fiber reinforced sheets 21a to 21d and 22a to 22d disposed in the space between the airtight film 41 and the outer surfaces 13a and 13b of the branch pipe 10 covered with the airtight film 41. It can be made the state affixed on the outer surfaces 13a and 13b.

  As shown in FIG. 8, the spiral member 45 is arranged in a substantially T shape in plan view, and is provided for diffusing the matrix resin introduced from the resin introduction devices provided at three locations in a desired direction. It has been.

  Thereby, the matrix resin introduced from the resin introduction device is guided by the spiral member 45 so as to flow from three directions toward the exhaust port provided in the central portion of the main pipe 11 where the decompression device 44 is installed. (See the arrow direction of the two-dot chain line in FIG. 8).

  Furthermore, in the present embodiment, as described above, the anisotropic sheet 31 that promotes the flow of the matrix resin in a specific direction is provided between the layers of the laminated fiber reinforced sheets 21a. And the anisotropic sheet | seat 31 is arrange | positioned over the edge part arrange | positioned stepwise from between the layers of the laminated fiber reinforced sheet | seat 21a.

  Thereby, when the matrix resin is introduced, since the end portion of the anisotropic sheet 31 is exposed, the matrix resin is taken in from the exposed portion, and a specific direction (FIG. 5 (b) and It can be made to flow in the direction of the arrow shown in FIG. Therefore, the fiber reinforced sheet 21a can be cured in a state sufficiently impregnated with the matrix resin.

  Further, in the present embodiment, as described above, the diffusing member 32 is provided along the end portions of the laminated fiber reinforced sheets 21a arranged in a stepped shape.

  Thereby, when matrix resin is introduce | transduced, matrix resin can be made to flow along the step-shaped edge part of the fiber reinforced sheet | seat 21a. Therefore, also in the circumferential direction of the branch pipe 10, the matrix resin can be cured in a sufficiently diffused state.

  As a result, the matrix resin is cured in a state where the matrix resin is sufficiently impregnated into the fiber reinforced sheets 21a to 21d and 22a to 22d and the overlapping portions. Therefore, generation | occurrence | production of peeling of the fiber reinforced sheet | seat 21a etc. resulting from the impregnation of matrix resin being inadequate can be prevented effectively.

  In addition, the manufacturing method of the fiber reinforced resin molded product 30 using the infusion molding system 40 will be described in detail below.

<Method for producing fiber-reinforced resin molded product 30>
The manufacturing method of the fiber-reinforced resin molded product 30 of the present embodiment will be described as follows with reference to FIG.

  The fiber reinforced resin molded product 30 of this embodiment is manufactured according to the flowchart shown in FIG. 9 using the infusion molding system 40 shown in FIG.

  That is, in step S1, on the outer surface of the branch pipe 10, on one region (outer surface 13a) divided into two regions by the center plane D, four sheets serving as base materials for the fiber reinforced portions 21 and 22 are formed. The fiber reinforced sheets 21a to 21d and the anisotropic sheet 31 arranged on the upper surface thereof are arranged (first arrangement step).

  At this time, the anisotropic sheet 31 is arrange | positioned across the surface of the edge part of the fiber reinforcement sheet | seat 21a arrange | positioned stepwise from the interlayer of the fiber reinforcement sheet | seat 21a.

  In addition, the anisotropic sheet 31 may be affixed beforehand on the upper surface of each fiber reinforced sheet 21a-21d, may be integrated, and when each fiber reinforced sheet 21a-21d is arrange | positioned, it will affix on the upper surface. It may be attached.

  Moreover, in step S1, after arrange | positioning the fiber reinforcement sheets 21a-21d on the outer surface 13a, the diffusion member 32 mentioned above is arrange | positioned in the step-shaped part formed in edge parts, such as the fiber reinforcement sheet 21a.

  Furthermore, in step S <b> 1, the spiral member 45 for diffusing the matrix resin is disposed at a predetermined position near the center of the main pipe 11.

  Next, in step S2, the region of the branch pipe 10 in which the four fiber reinforced sheets 21a to 21d and 22a to 22d are arranged on the outer surface 13a is used by using the airtight film 41 and the sealing materials 42a and 42b. Seal (first sealing step).

  Next, in step S <b> 3, the space between the airtight film 41 and the outer surface 13 a of the branch pipe 10 covered with the airtight film 41 using the decompression device 44 through a suction port provided at one place. Is decompressed (first decompression step).

  Next, in step S4, a matrix resin is introduced into the space between the airtight film 41 in a decompressed state and the outer surface 13a of the branch pipe 10 covered with the airtight film 41 (first introduction step). .

  Thereby, the fiber reinforced sheets 21a to 21d and 22a to 22d are impregnated with the matrix resin diffused by the spiral member 45. In the vicinity of the ends of the fiber reinforced sheets 21a to 21c and 22a to 22c, the anisotropic resin 31 introduces a matrix resin from the ends of the step-like fiber reinforced sheets 21a to 21c and 22a to 22c to the inside. The Furthermore, the matrix resin is diffused along the circumferential direction of the branch pipe 10 by the diffusion member 32 in the vicinity of the end portions of the step-like fiber reinforced sheets 21 a to 21 c and 22 a to 22 c.

  Next, in step S5, the matrix resin sufficiently impregnated in the fiber reinforced sheets 21a to 21d and 22a to 22d is cured by the anisotropic sheet 31 and the diffusion member 32 (first curing step).

  Here, when the matrix resin is cured, heat may or may not be applied depending on the curing temperature and properties of the matrix resin.

  Thereby, the space in the airtight film 41 is decompressed in the decompression step, and the fiber reinforced sheets 21a to 21d and 22a to 22d are in close contact with the outer surface 13a of the branch pipe 10 without wrinkles. The matrix resin impregnated in 21a to 21d and 22a to 22d can be cured.

  As a result, in the processes from step S1 to step S5, the four fiber reinforced sheets 21a to 21d are integrated in a state of being attached to the upper half (outer surface 13a) side of the branch pipe 10.

  Next, in step S6 (second arrangement process), step S7 (second sealing process), step S8 (second decompression process), step S9 (second introduction process), and step S10 (second curing process), branching occurs. On the side of the outer surface 13b of the tube 10, the same processes as those in steps S1 to S5 described above are performed.

  Thereby, the outer surfaces 13a and 13b of the branch pipe 10 are divided into two stages, covered with the fiber reinforced sheets 21a to 21d and 22a to 22d, and the fiber reinforced resin molded product 30 impregnated with the matrix resin and cured is obtained. it can.

  In the manufacturing method of the fiber reinforced resin molded product 30 of the present embodiment, as described above, the fiber reinforced sheets 21a to 21d and 22a to 22d are arranged in a stepped manner with the three laminated layers. The And in the edge part of the fiber reinforced sheet | seat 21a arrange | positioned at step shape, it arrange | positions in the state in which the anisotropic sheet 31 was exposed to the upper surface of step shape, respectively.

  Thereby, a plurality of fiber reinforced sheets 21a to 21d laminated from the stepped portion formed at the end of fiber reinforced sheets 21a to 21d and 22a to 22d laminated by the anisotropic sheet 31. , 22a to 22d can be sufficiently impregnated with the matrix resin up to the inside and ends.

  As a result, generation | occurrence | production of peeling between the fiber reinforced sheets 21a-21d and 22a-22d laminated | stacked on the thickness direction can be prevented effectively.

  Furthermore, in this embodiment, the diffusion member 32 is provided along the step-shaped part formed in the edge part of the fiber reinforced sheets 21a-21d and 22a-22d laminated | stacked by two or more sheets.

  Thereby, the matrix resin can be diffused along the circumferential direction of the branch pipe 10 by the diffusion member 32.

  As a result, the fiber reinforced sheets 21a to 21d and 22a to 22d are more effectively impregnated into the inside and the ends of the fiber reinforced sheets 21a to 21d and 22a to 22d laminated in the thickness direction more effectively. Generation | occurrence | production of peeling in between can be prevented effectively.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the said embodiment, as shown in FIG. 1, the fiber reinforced resin molded product reinforced by covering the fiber reinforced sheet 21a-21d and 22a-22d on the outer surface of the substantially T-shaped branch pipe 10 in planar view. 30 has been described as an example. However, the present invention is not limited to this.

  For example, a substantially L-shaped resin tube shown in FIG. 11 or a fiber-reinforced resin molded product reinforced by covering the outer surface of a simple resin tube with a fiber-reinforced sheet may be used.

  One of the outer surfaces of the substantially L-shaped resin pipe 110 shown in FIG. 10 divided by the center plane D including the axis X11 of the first pipe portion 111 and the axis X12 of the second pipe portion 112 is the outer surface ( When the first covering surface (113a) and the other surface are the outer surface (second covering surface) 113b, as in the above-described embodiment, fiber reinforced sheets 21a and the like that are joined in the thickness direction in a stacked state are used. By producing a resin molded product, the same effect as described above can be obtained.

(B)
In the said embodiment, as shown in FIG. 4, it arrange | positions so that the edge part of the fiber reinforced sheet | seat 21d arrange | positioned last on the fiber reinforced sheet | seat 21a arrange | positioned initially on the outer surface of the branch pipe 10 may overlap. An example in which the anisotropic sheet 31 and the diffusing member 32 that improve the fluidity of the matrix resin are disposed in the portion (overlapping portion 23a) has been described. However, the present invention is not limited to this.

  For example, an anisotropic sheet (anisotropic member) or a diffusion member for improving the fluidity of the matrix resin may be provided in an overlapping portion of other fiber reinforced sheets.

(C)
In the above embodiment, an example in which the anisotropic sheet 31 and the diffusion member 32 are used in combination in order to sufficiently impregnate the matrix resin into the inside and the end of the fiber reinforced sheet 21a and the like in which a plurality of sheets are laminated. I gave it as an explanation. However, the present invention is not limited to this.

  For example, the structure which arrange | positions only an anisotropic sheet | seat between layers, such as the fiber reinforced sheet | seat 21a laminated | stacked in multiple sheets, and does not use a diffusion member may be sufficient.

  However, it is more preferable to use a combination of the anisotropic sheet and the diffusing member as in the above embodiment in that diffusion hardening of the matrix resin in a direction different from the anisotropic sheet can be obtained.

(D)
In the said embodiment, the fiber reinforced sheet | seats 21a-21d were given and demonstrated by giving the example comprised by laminating | stacking the four glass fiber sheets 21aa-21ad in the thickness direction. However, the present invention is not limited to this.

  For example, 3 or less glass fiber sheets may be joined to constitute a fiber reinforced sheet, or 5 to 15 glass fiber sheets may be joined in the thickness direction to constitute a fiber reinforced sheet.

(E)
In the said embodiment, the anisotropic sheet 31 demonstrated and demonstrated the example using the non-crimp fabric containing a main fiber bundle and an auxiliary fiber bundle. However, the present invention is not limited to this.

  For example, a member other than a non-crimp fabric may be used as long as the recess is formed along a specific direction that improves the fluidity of the matrix resin.

(F)
In the said embodiment, the example using glass fiber was given and demonstrated as the fiber raw material contained in the fiber reinforcement sheets 21a-21d and 22a-22d. However, the present invention is not limited to this.

  The fiber material contained in the fiber reinforced sheet is not limited to glass fiber. For example, metal fiber and other inorganic fibers; carbon fiber, aramid fiber, polyvinyl alcohol fiber, vinyl chloride fiber, acrylic fiber, polyester fiber, polyurethane Fibers, polyethylene fibers, polypropylene fibers, polystyrene fibers, acetate fibers and other organic synthetic fibers; hemp and bamboo and other natural fibers; rayon and other regenerated fibers may be used.

  Moreover, as for the fiber material contained in the fiber reinforced sheet mentioned above, one type of fiber material may be used independently, and a plurality of types of fiber materials may be used in combination.

(G)
In the above embodiment, unsaturated polyester resin (thermosetting) is used as the matrix resin introduced in the first and second introduction steps in order to fix the fiber reinforced sheets 21a to 21d and 22a to 22d on the outer surface of the branch pipe 10. An example using a conductive resin) has been described. However, the present invention is not limited to this.

  As the matrix resin to be introduced in the first and second introduction processes, other thermosetting resins such as acrylic resin, vinyl ester resin, alkyd resin, amino resin, epoxy resin, urethane resin, phenol resin, and silicon resin are used. May be.

(H)
In the said embodiment, the example using polyolefin resin etc. was given and demonstrated as a material used for a primer. However, the present invention is not limited to this.

  For example, polypropylene resins such as isotactic polypropylene and syndiotactic polypropylene; polyethylene resins such as ultrahigh molecular weight polyethylene, high density polyethylene, medium density polyethylene, linear low density polyethylene, and low density polyethylene; poly (1-butene) In addition to polyolefin resin such as poly (4-methylpentene-1) resin; hard component such as polypropylene and polyethylene, ethylene / propylene copolymer, ethylene / propylene / gen copolymer (EPDM), Polyolefin thermoplastic elastomer composed of soft components such as butyl rubber (IIR) and flexible ethylene copolymer, polystyrene thermoplastic elastomer composed of polystyrene block and elastomer block of flexible polyolefin structure Other materials may be used such as Sutoma.

In addition, only 1 type may be sufficient as polyolefin resin, and 2 or more types may be sufficient as it.
(I)
In the said embodiment, the branch pipe 10 comprised by the cylindrical main pipe 11 and the cylindrical branch pipe 12 was given and demonstrated as an example which used as a cylindrical resin pipe. However, the present invention is not limited to this.

  For example, the cross-sectional shape of the cylindrical resin tube is not limited to a circle, and a resin tube having another cross-sectional shape such as a polygon or an ellipse may be used.

(J)
In the said embodiment, it arrange | positions in substantially T shape in planar view, and the matrix resin introduce | transduced from the resin introduction apparatus installed in the T-shaped edge part 3 direction moves to a desired direction. The example in which the fiber reinforced resin molded product 30 is manufactured by the infusion molding system 40 using the spiral member 45 for promotion has been described. However, the present invention is not limited to this.

  For example, the matrix resin may be introduced without using a diffusion member such as a spiral member.

  Further, the resin introduction device may be provided near the center of the main pipe, and may be configured to introduce the matrix resin by reducing the pressure from three substantially T-shaped end portions.

  In this case, the matrix resin can be sufficiently impregnated into the fiber reinforced sheet by diffusing the matrix resin in three directions by a diffusion member such as a spiral member.

  The method for producing a fiber-reinforced resin molded product of the present invention has an effect that it is possible to prevent peeling of a plurality of fiber-reinforced sheets that are wound around a joint portion of a cylindrical resin tube. The present invention can be widely applied to a method for manufacturing a fiber reinforced resin molded product reinforced by providing a fiber reinforced portion on the outer surface of a pipe.

10 Branch pipe (resin pipe)
DESCRIPTION OF SYMBOLS 11 Main pipe 12 Branch pipe 13a Outer surface 13b Outer surface 21 Fiber reinforced part 21a-21d Fiber reinforced sheet 21aa-21ac Glass fiber sheet (fiber reinforced sheet)
22 Fiber reinforced portions 22a to 22d Fiber reinforced sheet 23a Overlapping portion 25 End surface 30 Fiber reinforced resin molded product 31 Anisotropic sheet (anisotropic member)
31a Convex part 31b Concave part 32 Diffusion member 40 Infusion molding system 41 Airtight film 42a Sealing material (exhaust port side)
42b Sealing material (suction port side)
44 Pressure reducing device 45 Spiral member (diffusion member)
110 Resin pipe 111 1st pipe part 112 2nd pipe part 113a, 113b Outer surface D Center plane S Step X1, X2 Axis (tube axis)
X11, X12 axis (tube axis)

Claims (9)

A fiber reinforced resin molding comprising: a cylindrical resin tube formed of a thermoplastic resin; and a fiber reinforced portion including a reinforced fiber disposed so as to cover the outer surface of the resin tube and impregnated with a matrix resin. A method for manufacturing a product,
An anisotropic member that arranges a plurality of fiber reinforced sheets serving as a base material of the fiber reinforced portion on the outer surface of the resin tube, and improves the fluidity of the matrix resin between layers of the fiber reinforced sheet An arrangement step of arranging,
A sealing step of sealing a space including the fiber reinforced sheet and the anisotropic member arranged in the arrangement step;
Introducing the matrix resin into the sealed space in the sealing step, and impregnating the fiber reinforced sheet and the anisotropic member with the matrix resin;
A curing step of curing the matrix resin impregnated in the fiber-reinforced sheet and the anisotropic member in the introduction step;
With
In the arranging step, the ends of the plurality of fiber reinforced sheets are arranged in a stepped manner, and the anisotropic member extends across the surface of the ends arranged in a stepped manner from the interlayer of the fiber reinforced sheets. Arranged,
Manufacturing method of fiber reinforced resin molded product. The anisotropic member includes a plurality of main fiber bundles arranged parallel to the weft direction and a plurality of main fiber bundles arranged along a radial direction intersecting the weft direction and integrated with a predetermined interval. An auxiliary fiber bundle,
The manufacturing method of the fiber reinforced resin molded product of Claim 1. The matrix resin is a thermosetting resin.
The manufacturing method of the fiber reinforced resin molded product of Claim 1 or 2. In the arrangement step, a plate-like diffusion member for diffusing the matrix resin in the circumferential direction of the resin pipe is arranged along the end portions arranged in a step shape of the fiber reinforced sheet.
The manufacturing method of the fiber reinforced resin molded product of any one of Claim 1 to 3. The diffusion member is a thermoplastic resin.
The manufacturing method of the fiber reinforced resin molded product of Claim 4. The diffusion member has a surface having releasability on the side attached to the end portion,
The manufacturing method of the fiber reinforced resin molded product of Claim 4 or 5. A cylindrical resin tube formed of thermoplastic resin;
A fiber reinforced portion that is disposed so as to cover the outer surface of the resin pipe and includes a plurality of fiber reinforced sheets cured in a state of being impregnated with a matrix resin;
An anisotropic member disposed between the layers of the fiber reinforced sheets laminated in a plurality of layers and assisting the fluidity of the matrix resin;
With
The ends of the plurality of fiber reinforced sheets attached to the outer surface of the resin pipe are arranged in a stepped manner, and the anisotropic member is arranged in a stepped manner from the interlayer of the fiber reinforced sheet. Arranged over the surface of the end,
Fiber reinforced resin molded product. The anisotropic member includes a plurality of main fiber bundles arranged parallel to the weft direction and a plurality of main fiber bundles arranged along a radial direction intersecting the weft direction and integrated with a predetermined interval. An auxiliary fiber bundle,
The fiber-reinforced resin molded product according to claim 7. The matrix resin is a thermosetting resin.
The fiber-reinforced resin molded product according to claim 7 or 8.

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