JP6519214B2 - Fiber reinforced plastic manufacturing method - Google Patents

Description

  The present invention relates to a method for producing a fiber-reinforced plastic by an RTM molding method, and more particularly to a method for producing a fiber-reinforced plastic capable of preventing the generation of surface quality defects of a molded article due to the movement of a reinforcing fiber substrate during resin flow.

  As a molding method of fiber reinforced plastics (FRP) having excellent productivity, a base made of dry reinforcing fiber cloth is placed in a mold, and a matrix resin is injected into the mold to form a reinforcing fiber base. There is known a molding method called RTM (Resin Transfer Molding) molding method, in which the molded product is released after the resin is impregnated and the resin is cured.

  In particular, in the case of improving the production rate of molded articles, or in the case of producing large molded articles, a plurality of resin injection holes are provided, and resin is injected from a plurality of injection points to form a fiber reinforced plastic A technique for shortening the molding time of the fiber reinforced plastic is used, or a technique for shortening the molding time of the fiber reinforced plastic by making the cavity in the mold thicker than the final molded product thickness at the time of resin injection and impregnating at high speed by mold closing.

  For example, in Patent Document 1, an intermediate member for forming a resin flow path penetrating in the thickness direction is disposed between the molding die and the laminate, and the resin is added to the reinforced fiber laminate through the intermediate member. A technique is disclosed that injects from a plurality of locations substantially simultaneously. According to this method, it is supposed that the molding process from resin injection to impregnation / hardening can be carried out at high speed without producing a region in which the resin does not flow, even for a relatively large three-dimensional planar body.

  Further, in Patent Document 2, there is a technology in which a reinforcing fiber laminate and a matrix resin are introduced between molding dies in a state where the molding cavity is thicker than the final molded product thickness, and the injected matrix resin is expanded and impregnated according to the mold closing. It is disclosed. According to this method, high-speed injection / impregnation can be performed even on a relatively large three-dimensional planar body with little influence of the flow resistance of the reinforcing fiber laminate, and the forming time can be significantly shortened. Be done.

  In Patent Document 3, a reinforced fiber laminate is fixed by a mold having a plurality of divided structures, and a resin is injected in a state in which a gap is formed between the reinforced fiber laminate and a movable mold which is a part of the mold. After that, a technique is disclosed in which the reinforcing fiber laminate is impregnated with a resin by pressing the movable mold. According to this technique, since resin injection / impregnation is performed in a state where the reinforcing fiber laminate is fixed, disturbance of the reinforcing fiber base is easily suppressed.

  On the other hand, in Patent Document 4, when the resin is injected, the molding cavity is made smaller than the apparent thickness of the reinforcing fiber laminate in the atmosphere and made larger than the final product thickness, and high speed injection due to fixation of the reinforcing fiber laminate and flow resistance reduction. Technologies that are compatible with each other are disclosed.

JP, 2005-246902, A JP, 2005-271551, A Unexamined-Japanese-Patent No. 2010-120271 JP, 2010-221642, A

  However, in the method disclosed in Patent Document 1, when the resin flow rate is increased to impregnate the resin as quickly as possible, the resin injection pressure becomes high, and the problem of the disturbance of the reinforcing fiber base material constituting the reinforcing fiber laminate occurs. was there.

  The disturbance of the reinforcing fiber base means that, for example, as shown in FIG. 1, the reinforcing fiber base 41 in the form of a woven fabric is pushed by the pressure of the injected resin 61 and deviates from the position before injecting the resin. 411 is a phenomenon of deformation, and not only the designability of the molded article is lowered, but also the mechanical physical properties are lowered due to the unintended fiber orientation.

  In the method disclosed in Patent Document 2, when the mold closing speed is increased in order to increase the resin impregnation speed, the resin flows at high speed, the pressure exerted on the reinforcing fiber laminate becomes high, and the reinforcing fiber base Disturbance of the Therefore, there is a problem that the surface quality of the molded fiber reinforced resin is lowered.

  Further, in the method disclosed in Patent Document 3, in order to use a mold having a structure divided into a plurality of parts, a large number of seal parts are required to fill in the gaps between the molds, leading to complication of the mold structure. Therefore, it is difficult to apply to large-sized molded articles.

  On the other hand, in the method disclosed in Patent Document 4, the flow resistance of the reinforced fiber laminate is greater than in the case where the reinforced fiber laminate and the mold are in contact and a gap is formed between them. Since the fiber volume content (Vf) of the reinforcing fiber laminate at the time of resin injection is low, the fixing force is also considered to be low, and there is a problem that the speeding up of injection / impregnation is limited. In addition, it is necessary to control the thickness of the molding cavity accurately, and there is a problem that a press having a high-performance position control mechanism is required.

  The object of the present invention is, in view of the current state of the prior art as described above, a fiber reinforcement which can prevent the disturbance of the reinforcing fiber base even when the resin is injected at a large flow rate, and does not cause complication of the mold structure. It is in providing a plastic manufacturing method.

In order to solve the above-mentioned subject, a fiber reinforced plastic manufacturing method concerning the present invention is as follows.
(1) A reinforcing fiber laminate is disposed in a cavity of a molding die, and a resin is injected into the cavity from a resin inlet provided in the molding die to impregnate the reinforcing fiber laminate with the resin and cured. In a fiber-reinforced plastic manufacturing method for obtaining a fiber-reinforced plastic, the reinforcing fiber laminate is injected by a holding portion for holding at least a part of the reinforcing fiber laminate provided in the cavity by injecting resin into the cavity. A fiber reinforced plastic manufacturing method characterized by carrying out in the state where it was held.
(2) The fiber reinforced plastic manufacturing method as described in said (1) whose said holding part is an elastic body.
(3) The fiber reinforced plastic manufacturing method as described in said (1) or (2) in which the said holding part is installed in the area | region along the outer periphery of the said reinforced fiber laminated body.
(4) The method for producing a fiber-reinforced plastic according to (1) or (2), wherein the grip portion is intermittently installed in a region along the outer periphery of the reinforcing fiber laminate.
(5) The method for producing a fiber-reinforced plastic according to (2), wherein the mold has a holding portion for holding the elastic body.
(6) The method for producing a fiber-reinforced plastic according to (1), wherein the grip portion has a surface roughness greater than the surface roughness of the inner surface of the cavity other than the grip portion.

  According to the fiber-reinforced plastic manufacturing method of the present invention, high resin flow rate and impregnation speed can be achieved without complicating the mold structure and causing disturbance in the reinforcing fiber base when injecting and impregnating the resin. Can be secured. Therefore, high-design molded articles can be obtained in a short time.

It is the schematic diagram which illustrated disorder of the reinforcing fiber base material in a prior art. It is a schematic longitudinal cross-sectional view which shows one working state of the RTM shaping | molding apparatus used for this invention. FIG. 5 is a schematic cross-sectional view of one operating state in which the cavity is at final product thickness. FIG. 7 is a schematic cross-sectional view of one operating state in which the cavity is thicker than the final product thickness. It is the schematic sectional drawing which illustrated the state which has arrange | positioned the elastic body as a holding part. It is the schematic top view which illustrated the state which provided the holding part in the area | region along the outer periphery of the shaping | molding die. It is the schematic top view which illustrated the state which provided the holding part continuously in the area | region along the outer periphery of the shaping | molding die. It is the schematic top view which illustrated the state which provided the holding part intermittently in the area | region along the outer periphery of a shaping | molding die. It is the schematic sectional drawing which illustrated the state which arrange | positioned the elastic body directly as a holding part. It is the schematic sectional drawing which illustrated the state which embedded and arrange | positioned the elastic body as a holding part. It is the schematic sectional drawing which illustrated the state which provided the groove processing as a holding | maintenance part, embedded and arrange | positioned the elastic body. It is the schematic sectional drawing which illustrated the state which arrange | positioned the grooved core as a holding | maintenance part, embedded the elastic body, and arrange | positioned.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 shows one operating state of the RTM molding apparatus used in one embodiment of the present invention. The RTM molding apparatus used in the present embodiment includes a mold 10 formed of a pair of molds 10a forming the cavity 12 and the other mold 10b facing each other, a resin injection machine 9, and a resin injection line 91. A resin injection hole 3, a press mechanism 5, and a grip 2. Although FIG. 2 shows the lower mold as one mold 10a and the upper mold as the other mold 10b, there is no problem in the practice of the invention even in the opposite case. Further, in the present invention, the cavity represents the space between the molds inside the seal material.

  The cavity 12 in which the reinforcing fiber base laminate 4 is installed is sealed by a seal material 11 installed between the one mold 10 a and the other mold 10 b and outside the grip portion 2. In addition, when using an elastic body as a holding part and a sealing material, the material of an elastic body may mutually be same or different. Further, in the reinforcing fiber base laminate in the present invention, in addition to the one obtained by laminating a plurality of layers of the reinforcing fiber base, the reinforcing fiber base is only one layer or the reinforcing fiber is arranged in multiaxial direction to be integrated. Including those that have been

  Here, an example of the fiber reinforced plastic manufacturing method according to the present invention will be described. After the reinforcing fiber laminate 4 is disposed on one of the molds 10 a, the reinforcing fiber laminate 4 is gripped by the grip portion 2 by bringing the other mold 10 b into proximity. At this time, as long as the mold 10 is sealed by the sealing material 11, it may be close until the thickness of the cavity 12 becomes the thickness H of the fiber reinforced plastic finally obtained as shown in FIG. It may be stopped in a state larger than the thickness H of the fiber reinforced plastic finally obtained. Moreover, the holding part 2 may be provided only in any one of the one shaping | molding die or the other shaping | molding die, and may be provided in both shaping | molding dies.

  Next, the matrix resin sent from the resin injection machine 9 is injected from the resin injection hole 3 provided on the cavity side surface of at least one of the molds and opened and closed by, for example, a pin-shaped valve body 31. The body 4 is impregnated. Here, if the cavity 12 at the time of resin injection is larger than the thickness of the fiber reinforced plastic finally obtained as shown in FIG. 4, until the cavity 12 becomes the thickness of the final molded product during or after the resin injection is completed. Resin impregnation is performed by closing the mold 10. The resin is then cured to form a fiber reinforced plastic of the same shape as the cavity 12. In the present embodiment, since the reinforcing fiber laminate 4 is gripped by the grip portion 2, movement of the reinforcing fiber laminate 4 can be prevented even when resin injection / impregnation is performed at high speed. It can be molded without disturbance.

  The resin used in the present invention is not limited to thermosetting resins such as epoxy resin, vinyl ester resin, unsaturated polyester resin, and phenol resin, but also thermoplastic resins such as acrylic resin, polyamide resin, and polyolefin resin. be able to. In particular, a resin having a low viscosity and a good impregnation with the reinforcing fiber base, such as a resin viscosity of 10 Pa · s or less at a time, is particularly preferable.

  Further, the reinforcing fiber base in the present invention is a generic term for a base made of reinforcing fibers. Examples of the reinforcing fibers used for the reinforcing fiber base in the present invention include carbon fibers, glass fibers, aramid fibers, PBO (polyparaphenylene benzobisoxazole) fibers, tyranno (titanium alumina) fibers, nylon fibers and the like. Of course, not only single fibers but also substrates composed of a plurality of fibers can be used.

Further, the form of the reinforcing fiber base material, a plain weave or twill weave is not limited to fabrics, such as Ri satin weave, UD having uniform strands in one direction (U ni D irection) materials, non-crimp fabric material and Tajikumotozai, A mat material such as a random mat or a continuous strand mat, a knit material, a base material in which strands are aligned and fixed with a thermoplastic binder or stitch, and a hybrid base material combining these may also be used.

  For example, as shown in FIG. 5, the grip portion 2 is configured by arranging an elastic body 21 different from the sealing material 11 between one mold 10 a and the reinforcing fiber laminate 4. The distance h between the cavity-side surface 101a of one of the molds 10a and the first surface 211 of the elastic body 21 in contact with the reinforcing fiber laminate in a state in which the reinforcing fiber laminate 4 is not disposed is The amount necessary for gripping the reinforcing fiber laminate may be determined according to the weight of the body 4, the bulk density, the desired resin flow rate, and the like. By placing the reinforcing fiber laminate 4 and closing the mold, the distance between the first surface 211 of the elastic body 21 and the cavity-side surface 101 a of one of the molds 10 a is reduced to h ′ and reinforced by its repulsive force The fiber laminate 4 is pressed against the cavity side surface 101b of the other mold 10b. As a result, the frictional force between the reinforcing fiber laminate 4 and the cavity-side surface 101b of the other mold 10b can be made higher than that in the portion other than the grip portion, so that the movement of the reinforcing fiber laminate 4 due to resin flow is prevented. It is possible to obtain a high-quality fiber-reinforced plastic which is free from the disturbance of the reinforcing fiber base.

  In particular, as shown in FIG. 4, when the thickness of the cavity 12 is thicker than that of the final molded product during resin injection, and the mold 10 is closed to the thickness of the final molded product after injection is completed, the elastic body 21 is used for gripping the reinforcing fiber laminate 4 Thus, the reinforcing fiber laminate 4 can be gripped in all the steps of resin injection and impregnation. In addition, by using the elastic body 21, after the cured fiber reinforced plastic is removed from the mold, it can be repeatedly used because it returns to the original shape, and it is optimal for a mass production process because it is not necessary to replace it every molding .

  Further, as shown in FIG. 4, by making the thickness of the cavity 12 during resin injection thicker than the final molded product, the reinforcing fiber laminate 4 is not pressed by the molding die more than necessary, and the entire inside of the cavity 12 is obtained. The matrix resin is easily impregnated, and the resin impregnation time of the entire reinforcing fiber laminate 4 can be shortened, and the generation of the non-impregnated part can be suppressed.

  The elastic body 21 is suitably selected from silicone rubber, fluororubber, acrylic rubber, nitrile rubber, ethylene propylene rubber, styrene butadiene rubber, etc. in consideration of the characteristics, releasability, molding temperature, etc. of the resin used. You can choose Further, the elastic modulus of the elastic body 21 to be used may be selected according to a desired molding cycle. Further, the cross-sectional shape of the elastic body is not particularly limited, such as a circle, a polygon, an open circle and the like.

  In FIG. 6, the state which has arrange | positioned the reinforced fiber laminated body 4 in one shaping | molding die 10a which provided the holding part 2 is shown. The grip portion 2 is provided under the reinforcing fiber laminate 4 but is shown by dotted lines and white in the drawing. Further, a position 32 opposed to a resin injection hole provided in the other mold not shown is also shown in the drawing. It is preferable that the grip portion 2 be provided in the region 43 along the outer periphery of the reinforcing fiber laminate 4 as described above. In addition, the area | region 43 along the outer periphery of the reinforced fiber laminated body 4 points out the area | region of the shaping | molding die corresponding to the part outside the end product range 42 in the reinforced fiber laminated body 4. FIG. Moreover, when providing the holding part 2 in the area | region 43 along the outer periphery of the reinforced fiber laminated body 4, even a part of holding part 2 should just enter the area | region 43 along the outer periphery of the reinforcing fiber laminated body 4. FIG. The disturbance of the reinforcing fiber base is particularly due to the flow of resin in the direction in which the reinforcing fiber laminate is compressed, that is, from the outside to the inside of the fiber reinforced plastic. On the other hand, there are many cases where resin injection holes are installed on the outside of the final product range 42 as shown in FIG. 6 due to design problems, and the reinforced fiber laminate moves by resin flow from the outside to the inside and strengthens Disturbance of the fiber substrate occurs. In this case, by holding the region 43 along the outer periphery of the reinforcing fiber laminate 4 which is the starting point of the movement of the reinforcing fiber laminate, it is possible to suppress the disturbance of the reinforcing fiber base material.

  Further, the grip portion may be continuously installed in the area 43 along the outer periphery of the reinforcing fiber laminate 4 as shown in FIG. 7 or may be intermittently installed as shown in FIG.

  When continuously installing in a region 43 along the outer periphery of the reinforcing fiber laminate 4, the resin flow from the outside to the inside by installing so as to surround the position 32 facing the resin injection hole as shown in FIG. 7 Of the reinforcing fiber laminate 4 can be suppressed more effectively. In addition, in FIG. 7, the holding part 2 is shown by the black solid line which encircles the area | region 43 along the outer periphery of the reinforcement fiber laminated body 4 surrounding the position 32 which opposes a resin injection port. In the present invention, "continuous" refers to a state in which there is only one gripping portion. Therefore, the gripping portion 2 does not necessarily have to go around the area 43 along the outer periphery of the reinforcing fiber laminated pair 4.

  On the other hand, in the case of intermittent installation, as the resin flow 7 is shown in FIG. 8, the entire area 43 along the outer periphery of the reinforcing fiber laminate 4 can be used as an apparent resin injection hole, so The resin can be injected and impregnated at a flow rate, which is effective in shortening the molding cycle. When installing intermittently, you may arrange at equal intervals, specify in advance the location where it is easy for the reinforcing fiber laminate to move, and it may be limited to that location, or be elastic at each location You may change the type and size of the body. In the present invention, "intermittently" means that a plurality of grips are arranged such that adjacent grips are spaced apart from each other. Although the number and intervals of the holding portions can be set appropriately, as shown in FIG. 8, the matrix resin injected from the resin injection hole 32 wraps around the space between the outer periphery of the reinforcing fiber laminate 4 and the cavity 12. After that, it is preferable to provide a space between many grips so that the inside of the reinforcing fiber laminate 4 can be impregnated uniformly. In addition, when the matrix resin is impregnated into the reinforcing fiber laminate 4, it is preferable to shorten the lateral width of the gripping portion so that the non-impregnated portion due to the flow front of the matrix resin impregnated from both ends of the gripping portion is not generated.

  Although the elastic body 21 may be disposed directly on one mold 10a or the other mold 10b as shown in FIG. 9, the elastic body 21 is fixed on one mold 10a or the other mold 10b. It is preferable to provide a holding portion for When the holding portion is not provided, the elastic body 21 needs to be disposed at an appropriate position for each molding operation, whereas when the holding portion is provided, reinforcing fiber lamination is performed only by the opening and closing operation of the molding die. The body 4 can be gripped. The holding portion only needs to be able to fix the elastic body 21 on the molding die, for example, a convex mountain-shaped structure on the surface of the molding die, holding the elastic body 21 by covering the elastic body 21 thereon, It is a concave grooved structure on the surface of the mold, and a holding portion that fixes the elastic body 21 by embedding the elastic body 21 in the groove can be mentioned. Among them, since the elastic body 21 can be easily attached, it is more preferable to use a holding portion having a grooved structure in which the elastic body is embedded in one mold 10a or the other mold 10b as shown in FIG. The embedding of the elastic body 21 in one of the molds 10a or the other mold 10b may be achieved by processing the groove 22 for the elastic body directly in the mold as shown in FIG. 11 or the elastic body as shown in FIG. An insert 23 formed by processing a groove 22 for use may be used. The cross-sectional shape of the groove 22 may be selected appropriately for the cross-sectional shape of the elastic body 21 used. Further, the edge 221 of the groove 22 shown in FIG. 11 and FIG. 12 is preferably chamfered in order to increase the durability of the elastic body 21.

  The gripping portion 2 in the present invention is not limited to the configuration using the elastic body 21. For example, the surface roughness of the inner surface of the cavity 12 other than the gripping portion 2 is not the gripping portion 2 of one mold 10a or the other mold 10b. Since the coefficient of friction between the reinforcing fiber laminate 4 and the grip portion 2 can be increased by having a large surface roughness, it is possible to suppress the movement of the reinforcing fiber laminate 4 due to the resin pressure. Further, the method using the elastic body 21 may be applied to a method in which the grip portion 2 has a surface roughness larger than the surface roughness of the inner surface of the cavity 12 other than the grip portion 2. In that case, the coefficient of friction of the grip portion 2 can be further increased by increasing the surface roughness of the first surface 211 in contact with the reinforcing fiber laminate of the elastic body 21, and the resin pressure of the reinforcing fiber laminate 4 Movement can be further suppressed.

  As described above, in the fiber reinforced plastic manufacturing method according to the present invention, the grip portion of the reinforcing fiber laminate is formed by a simple method applicable to a conventional mold, and reinforced in all steps from resin injection to impregnation and curing. By holding the fiber laminate, the resin can be injected at a high flow rate without disturbance in the reinforcing fiber base, and a high-design fiber reinforced resin can be obtained in a short time.

  Hereinafter, the present invention will be described in more detail by way of examples and comparative examples.

  In the examples, the materials described below were used.

· Reinforcing fiber base material: Carbon fiber fabric "CK 6255" (woven structure: plain weave, fabric weight: 330 g / m ² ) manufactured by Toray Industries, Inc. 5 g / m ² of binder (granular) of thermoplastic resin is attached Resin: Epoxy resin manufactured by Toray Industries, Inc. In the examples, a mold having a 550 × 550 mm flat cavity was used. The molding die is an upper and lower die, and a resin injection hole is provided in the upper die. The mold had a heat medium flow path, and in the example, the mold was heated to 120 ° C. by flowing pressurized water to conduct a test.

  The dimensions of the reinforced fiber laminate used in the present example and the comparative example are 500 × 500 mm, and the laminate configuration is as follows.

· Reinforcing fiber laminate: Reinforcing fiber base (0/90 ° fiber orientation) × 5 ply
Further, in the present example and the comparative example, the thickness of the cavity is set larger than the thickness of the final molded product using a mold lifting mechanism (not shown) at the time of resin injection, and the mold is made to the thickness of the final molded product after resin injection is completed. Closed.

Example 1
A reinforcing fiber laminate was placed on the lower mold, and a silicone rubber sheet was placed thereon at 50 mm intervals, and the upper mold was closed. The thickness of the cavity at this time was set larger than the thickness of the final molded product. In this state, the resin was injected from the resin injection hole using a resin injection machine, the cavity thickness was reduced to the thickness of the final molded product, and the resin was cured.

  The obtained fiber reinforced plastic had a high design without disturbance of the reinforcing fiber base without moving the reinforcing fiber laminate.

(Example 2)
A reinforced fiber laminate was placed on the lower mold, and a silicone rubber cord was placed on the lower one so as to surround the position facing the resin injection hole, and then the other mold was closed. As in Example 1, the thickness of the cavity at this time was set larger than the thickness of the final molded product. In this state, after resin was injected from the resin injection hole under the same conditions as in Example 1, the cavity thickness was reduced to the thickness of the final molded product, and the resin was cured.

  The obtained fiber reinforced plastic had a high design without disturbance of the reinforcing fiber base without moving the reinforcing fiber laminate.

(Comparative example 1)
The reinforcing fiber laminate was placed on the lower mold, and no silicone rubber was placed, and the other mold was closed as it was. The cavity thickness at this time was set larger than the thickness of the final molded product as in the first and second embodiments. In this state, after resin was injected from the resin injection hole under the same conditions as in Examples 1 and 2, the cavity thickness was reduced to the thickness of the final molded product, and the resin was cured.

  In the obtained fiber-reinforced plastic, the reinforcing fiber laminate largely moves inward from the initial position, and the reinforcing fiber base is disturbed, and the resin flow path is blocked accordingly, so that the center of the reinforcing fiber laminate is not impregnated. The territory was also seen.

  The fiber reinforced plastic manufacturing method according to the present invention is applicable to RTM molding of any fiber reinforced plastic for which it is desired to improve the surface quality of molded articles. Among them, it is preferably used as an automobile member for which shortening of molding time is desired while having high surface quality.

DESCRIPTION OF SYMBOLS 1 RTM shaping | molding apparatus 10 shaping | molding die 10a One shaping | molding die 10b The other shaping | molding die 101a Cavity side surface 101b Cavity side surface 11 Seal material 12 Cavity 2 Gripping part 21 Elastic body 22 Groove | channel for elastic bodies (holding part)
221 edge 23 core 3 resin injection hole 31 valve body 32 position facing resin injection hole 4 reinforcing fiber laminate 41 reinforcing fiber base 411 fiber bundle 42 final product range 43 region along outer periphery of reinforcing fiber laminate 5 Press mechanism 6 Matrix resin 7 Resin flow direction 9 Resin injection machine 91 Resin injection line

Claims (5)

A reinforced fiber laminate is disposed in a cavity of a mold, and a resin is injected into the cavity from a resin injection port provided in the mold to impregnate the reinforced fiber laminate with the resin and cured to obtain a fiber reinforced plastic In the method for producing a fiber-reinforced plastic, the resin is injected into the cavity by holding the reinforcing fiber laminate by a gripping portion which grips at least a part of the reinforcing fiber laminate provided in the cavity. in row have, the gripping portion, a fiber reinforced plastic production method which is characterized by having a greater surface roughness than the surface roughness of the cavity surface of the non-gripping portion.   The fiber reinforced plastic manufacturing method according to claim 1, wherein the grip portion is an elastic body.   The fiber reinforced plastic manufacturing method according to claim 1 or 2, wherein the grip portion is installed in a region along the outer periphery of the reinforcing fiber laminate.   The fiber reinforced plastic manufacturing method according to claim 1 or 2, wherein the grip portion is intermittently installed in a region along the outer periphery of the reinforcing fiber laminate. The fiber reinforced plastic manufacturing method according to claim 2, wherein the mold has a holding portion for holding the elastic body .

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