JP2005153176A - Manufacturing method of fiber reinforced resin structure and protruding plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a low cost fiber reinforced resin structure capable of sufficiently infiltrating an uncured resin into a fiber sheet, and a protruding plate used therein. <P>SOLUTION: This manufacturing method of the fiber reinforced resin structure includes a process for preparing a resin sheet reinforced by a first fiber sheet, the protruding plate having a plurality of protrusions formed on the surface of the resin sheet and a second fiber sheet, a process for placing the protruding plate and the second fiber sheet on a lower mold so that the plurality of the protrusions of the protruding plate come into contact with the second fiber sheet, a process for covering the lower mold with a upper mold and a flexible film so as to cover the second fiber sheet and the protruding plate, a process for supplying an uncured resin to the gap between the lower mold and the upper mold or the flexible film, and a process for curing the uncured resin. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for producing a fiber-reinforced resin structure and a projection plate used in the production method.

  BACKGROUND ART Fiber reinforced resin structures reinforced with fiber sheets such as glass cloth are used in a wide range of fields such as bathtubs and ship casings. Such a fiber reinforced resin structure is manufactured by filling an uncured resin in a space having a predetermined shape in which a fiber sheet is disposed and curing the resin.

  Specifically, for example, an RTM (Resin Transfer Molding) method in which a fiber sheet is placed in a space defined by a pair of molds and an uncured resin is supplied to the space, uncured while decompressing the space VaRTM (Vacuum Assisted Resin Transfer Molding) method for supplying the resin of the resin, a fiber sheet is placed in the space defined between the mold and the flexible film, and uncured resin is removed while decompressing this space. The supplied vacuum infusion method is known.

  In recent years, in order to further improve the performance of the fiber reinforced resin structure, it is required to reduce the voids in the fiber reinforced resin structure, and it is necessary to quickly and sufficiently impregnate the uncured resin in the fiber sheet. There is.

And as a method of sufficiently impregnating the uncured resin in the fiber sheet, for example, a thermoplastic resin such as polypropylene or polyethylene, or a mesh sheet made of metal, a mold or a flexible film and a fiber sheet A method of supplying uncured resin by interposing between them (for example, refer to Patent Documents 1 and 2), and a method of forming grooves on the surface of a core material such as a foamable material disposed in the space (for example, Patent Document 3), a method of forming irregularities on the inner surface of the mold (see, for example, Patent Documents 1 and 3), and a conduit for dispersing resin and supplying it into the space to the mold or flexible film A forming method (for example, Patent Document 4) is known.
JP 2001-62932 A U.S. Pat. No. 4,902,215 JP 2000-501659 A Japanese National Patent Publication No. 10-504501

  However, even if a mesh-shaped sheet as described above, a mold having a groove, unevenness, conduit, or the like, a flexible film, or a core material having a groove is used, the fiber sheet is uncured. The resin may not be sufficiently impregnated. Moreover, since the above-mentioned mesh-like sheet needs to be finally removed, a manufacturing loss is caused, and the environment is deteriorated due to an increase in waste. Furthermore, it is not easy to produce a mold having grooves, irregularities, conduits, etc., or a core material having grooves, which often leads to an increase in cost.

  The present invention has been made in view of the above problems, and a method for manufacturing a low-cost fiber-reinforced resin structure capable of sufficiently impregnating a fiber sheet with an uncured resin and a projection plate used therefor are provided. The purpose is to provide.

  A method for producing a fiber-reinforced resin structure according to the present invention includes a resin sheet reinforced by a first fiber sheet, a protrusion plate having a plurality of protrusions provided on the surface of the resin sheet, a second fiber sheet, Preparing the protrusion plate and the second fiber sheet, placing the protrusion plate and the second fiber sheet on the lower mold so that the plurality of protrusions of the protrusion plate are in contact with the second fiber sheet, and the second fiber. An uncured portion between the step of covering the lower mold with the upper mold or the flexible film so as to cover the sheet and the protruding plate, and the lower mold and the upper mold or the flexible film. A step of supplying a resin and a step of curing the uncured resin.

  The projection plate according to the present invention includes a resin sheet reinforced by the first fiber sheet, and a plurality of projections provided on at least one surface of the resin sheet.

  According to the present invention, a gap is formed between the projection plate and the second fiber sheet by the plurality of projections on the surface of the projection plate. As a result, in the step of supplying uncured resin, the resin easily flows in the direction along the surface of the second fiber sheet using the gap as a flow path, and the uncured resin is allowed to flow in the second fiber sheet. Fully reach the surface. Then, the uncured resin that has sufficiently spread over the surface of the second fiber sheet in this manner impregnates the second fiber sheet in a direction perpendicular to the second fiber sheet. Therefore, the resin non-impregnated part in the second fiber sheet can be reduced. In addition, the uncured resin is cured, so that the protruding plate and the cured resin are integrated. Since the protruding plate has the first fiber sheet, the strength of the fiber-reinforced resin structure to be molded is increased. This also contributes to the improvement of the material and does not need to be removed after molding.

  Here, in the step of supplying uncured resin, it is preferable to reduce the pressure between the lower mold and the upper mold or the flexible film to a state lower than atmospheric pressure.

  According to this, the second fiber sheet can be more sufficiently impregnated with the uncured resin, and the supply pressure of the uncured resin can be lowered.

  Also, in the step of preparing the protruding plate and the second fiber sheet, a plurality of second fiber sheets are prepared, and a protruding plate is prepared in which a plurality of protrusions are provided on both sides of the resin sheet. In the step of placing the second fiber sheet, it is preferable to place the protruding plate and the second fiber sheet on the lower mold so that the protruding plate is sandwiched between the second fiber sheets.

  According to this, the second fiber sheet can be sufficiently impregnated with uncured resin on both sides of the protruding plate. Therefore, particularly when the second fiber sheet is thick, or when a large number of second fiber sheets are laminated, the effect of reducing the unimpregnated portion of the resin is high.

  In addition, it is preferable that the plurality of protrusions on the protrusion plate have an oval shape when viewed from a direction perpendicular to the surface of the resin sheet, and the major axes of the ellipses in the plurality of protrusions are parallel to each other.

  According to such a protruding plate, it is possible to give anisotropy to the ease of flow of the uncured resin in the gap, for example, in the direction connecting the resin supply port and the discharge port (suction port). By arranging the long axis of the ellipse in the plurality of protrusions so as to be parallel, the uncured resin can flow more efficiently from the resin supply port toward the resin discharge port. Here, the “oval shape” is a concept including an oval shape in addition to an oval shape including a pair of straight lines and a pair of arcs.

  Moreover, it is preferable that a plurality of through holes penetrating the front and back surfaces are formed in the protruding plate.

  According to this, since the uncured resin can easily move in the direction perpendicular to the surface of the projection plate, it becomes easier to impregnate the uncured resin evenly into the second fiber sheet. In order to form such a protruding plate, for example, a multiaxial assembly fabric may be used as the first fiber sheet.

  ADVANTAGE OF THE INVENTION According to this invention, a fiber reinforced resin structure with few voids can be obtained rapidly and at low cost.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a method for producing a fiber-reinforced resin structure and a protruding plate of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
First, the manufacturing method of the fiber reinforced resin structure which concerns on 1st embodiment of this invention, and the projection board used for this are demonstrated.

(Preparation of protrusion plate and second fiber sheet)
In manufacturing the fiber reinforced resin structure, first, a protruding plate 20 as shown in FIGS. 1 and 2 is prepared.

  The protrusion plate 20 is formed by providing a plurality of resin-made protrusions 10 arranged in a predetermined manner on the surface of the fiber-reinforced resin sheet 8 and has a rectangular plate shape.

  The fiber-reinforced resin sheet 8 is a plate-like body having a laminate 24 in which a plurality of first fiber sheets 4 such as glass cloth are stacked, and a resin layer 6 impregnated and cured in the laminate 24. is there.

  On the other hand, many protrusions 10 are formed on one main surface of the fiber-reinforced resin sheet 8. As shown in FIG. 2, these protrusions 10 have an oval shape when viewed from a direction perpendicular to the surface of the resin plate. The length L1 in the major axis direction of the ellipse in the projection 10 is, for example, about 6 to 20 mm, the length L2 in the minor axis direction of the ellipse is, for example, about 2 to 8 mm, and the height H of the projection 10 (FIG. 1). Reference) is, for example, about 0.3 to 1.0 mm.

  Further, as shown in FIG. 2, these protrusions 10 are arranged in parallel with each other in the major axis when viewed from the direction perpendicular to the surface of the resin sheet 8 and are in a staggered arrangement. The major axis distance L3 between the protrusions 10 is, for example, 2 to 6 mm, and the minor axis distance L4 between the protrusions 10 is about 2 to 6 mm. These protrusions 10 are made of the same material as the resin layer 6 of the fiber-reinforced resin sheet 8.

  Such a protruding plate 20 can be manufactured, for example, as shown in FIGS. 3 (a) and 3 (b). That is, as shown in FIG. 3 (a), a punching metal plate 22 in which a large number of through-holes (elongate holes) 23 having an oval cross section corresponding to each protrusion 10 is formed in parallel with each other and in a staggered arrangement is prepared. A laminated body 24 of the first fiber sheet 4 is placed on the punching metal plate 22 and, as shown in FIG. 3 (b), a liquid uncured resin is formed on the laminated body 24 of the first fiber sheet 4. 7 is supplied. As a result, the uncured resin 7 is impregnated in the laminate 24 of the first fiber sheet 4 and the uncured resin 7 is also filled in the through holes 23. Thereafter, the uncured resin 7 is cured and the punching metal plate 22 is removed, whereby the protruding plate 20 as shown in FIGS. 1 and 2 can be easily formed. In particular, in this method, since the resin layer 6 and the protrusion 10 of the fiber-reinforced resin sheet 8 can be integrally formed with the same material, the mechanical strength of the protrusion plate 20 is increased, and the fiber-reinforced resin structure to be manufactured is manufactured. It is preferable from the viewpoint of increasing the strength. Further, the protruding plate 20 is not a punching metal plate in which a large number of through holes (long holes) 23 are formed as described above, but a concave grooved plate having a recess (not a through hole) corresponding to the protrusion 10. Can also be produced.

  Here, the first fiber sheet 4 in the resin sheet 8 of the protruding plate 20 as described above is not limited to a glass cloth as long as the fiber sheet can reinforce the resin, and is a glass fiber chopped strand mat, continuum. Asstrand mats, multiaxial fabrics, roving cloths and the like may be used. Moreover, it is not restricted to glass fiber, For example, the cloth | cross formed by the aramid fiber, the polyamide fiber, etc., a braid, a mat | matte, etc. may be sufficient.

  Further, the resin that forms the resin layer 6 and the protrusions 10 of the resin sheet 8 is not particularly limited, and thermosetting resins such as epoxy resins, phenol resins, unsaturated polyester resins, vinyl ester resins, knitted epoxy resins, and nylon resins. And thermoplastic resins such as polyester resin, ABS resin, polyethylene resin, polypropylene resin, polyvinyl chloride resin, polyether ketone resin, and polyphenylene sulfide resin.

  Subsequently, as shown in FIG. 2, a plurality of second fiber sheets 40 are prepared. As the second fiber sheet 40, a cloth such as glass fiber, carbon fiber, or aramid fiber may be used, and the same material as the first fiber sheet 4 of the protruding plate 20 can be used. Further, the second fiber sheet 40 has a rectangular shape having the same size as the protruding plate 20. In addition, the magnitude | size of the projection board 20 does not necessarily need to be the same magnitude | size as the 2nd fiber sheet 40, as shown in FIG. Similarly, the shape of the protruding plate 20 may be a rectangular shape, a polygonal shape, an oval shape, or a punching type in which a part thereof is cut out, and is not particularly limited.

(Assembling the mold)
Subsequently, as shown in FIGS. 4 and 5, a lower mold 50 made of metal or the like having a predetermined surface shape is prepared, and the protruding plate 20 and a plurality of second molds 50 are formed on the lower mold 50. The fiber sheets 40 are stacked and placed. Specifically, first, the protruding plate 20 is placed on the lower mold 50 so that the protruding portion 10 faces upward, and a plurality of second fiber sheets 40 are stacked on the upper layer, and the protruding plate 20 and the plurality of first plates are stacked. A reinforced base material layer 42 composed of the second fiber sheet 40 is formed. Here, the plurality of protrusions 10 on the protrusion plate 20 are in contact with the surface of the second fiber sheet 40 a that is the lowest layer among the plurality of second fiber sheets 40. In the present embodiment, the protruding plate 20 is the lowermost layer of the reinforcing base material layer 42, but it may be the uppermost layer. In this case, as shown in FIG. Should be arranged so as to face.

  Subsequently, plate-like jigs 54 a and 54 b are respectively spanned between the edge regions 42 a and 42 b facing each other on the upper surface of the reinforcing base layer 42 and the surface of the lower mold 50. . The jigs 54a and 54b are configured to define predetermined gaps 52a and 52b between the vacuum bag 60 and the lower mold 50 on the outside of both end faces of the reinforced base material layer 42, respectively. Here, as shown in FIG. 5, the major axis of the ellipse of the plurality of projections 10 of the projection plate 20 is set to be parallel to the direction connecting the pair of jigs 54a and 54b.

  Here, as shown in FIGS. 4 and 5, an opening 56 a of a line 56 for supplying uncured liquid resin is formed on the surface of the lower mold 50 that faces the jig 54 a (left side in the drawing). In addition, an opening 58a of a line 58 for exhausting gas from above the lower mold 50 by pressure reduction is formed on the surface of the lower mold 50 facing the jig 54b (right side in the drawing). . Line 56 is connected to a pump (not shown) that supplies uncured resin, while line 58 is connected to a vacuum pump (not shown).

  Subsequently, after disposing the sealing material 62 on the lower mold 50 so as to surround the reinforcing base material layer 42 and the jigs 54a and 54b, the vacuum bag 60 formed of a flexible film is reinforced. The lower mold 50 is placed over the base material layer 42 and the jigs 54a and 54b.

  Here, the film of the vacuum bag 60 is not particularly limited as long as it is airtight and flexible, but for example, a film of nylon, polyester, polyethylene, PVC polypropylene, polyimide, or the like can be used.

(Resin supply and curing)
Subsequently, the space formed between the vacuum bag 60 and the lower mold 50 is decompressed by exhausting air from the line 58. As a result, the vacuum bag 60 is pressed downward by the atmospheric pressure. Then, while continuing the exhaust, an uncured liquid resin 70 is supplied from a line 56 into a space formed between the vacuum bag 60 and the lower mold 50.

  Here, the uncured liquid resin 70 to be supplied is not particularly limited as long as it is a curable resin. For example, heat such as epoxy resin, phenol resin, unsaturated polyester resin, vinyl ester resin, and modified epoxy resin can be used. A curable resin is mentioned.

  Here, it is preferable to use the same type of resin as that used when forming the resin sheet 8 and the protrusion 10 as the uncured resin 70, whereby the protrusion plate 20 and a cured product of the uncured resin can be obtained. The strength of the fiber reinforced resin structure can be sufficiently increased because it is firmly adhered and integrated.

  Then, after the uncured resin is supplied, the uncured resin is cured by predetermined heating or cooling to room temperature by being left standing. Thereafter, the vacuum bag 60 is removed, and the fiber reinforced resin structure in which the cured resin and the reinforced base layer 42 are integrated is taken out. The manufacturing method of the fiber reinforced resin structure is thus completed.

  According to such a fiber reinforced resin structure manufacturing method and projection plate, the second fiber sheet 40a is pressed against the projection plate 20 by the pressure reduction by the vacuum pump. However, a gap 65 is formed between the protrusion plate 20 and the second fiber sheet 40 a by the protrusion 10 of the protrusion plate 20. For this reason, the uncured resin 70 supplied from the line 56 can be easily flowed from the left side to the right side in the drawing using the gap 65 as a flow path. Accordingly, the uncured resin moves along the surface of the second fiber sheet 40a and reaches the surface of the second fiber sheet 40a sufficiently. The uncured resin thus distributed is then impregnated in a direction perpendicular to the surfaces of the second fiber sheets 40a, 40, 40 with respect to the second fiber sheets 40a, 40, 40. Can do. Thereby, uncured resin can be impregnated in every corner of each 2nd fiber sheet 40, and the unimpregnated part of resin in the 2nd fiber sheet 40 can be reduced.

  Further, the protruding plate 20 is reinforced by the glass cloth 4 as the first fiber sheet, and such a protruding plate 20 sufficiently contributes to an increase in the strength of the fiber-reinforced resin structure as a reinforcing base material. Therefore, it is not necessary to remove the protruding plate 20 in a later process. Therefore, an extra process such as installation of a peel ply layer and a peeling process is not required, and the cost is hardly increased.

  Further, the plurality of protrusions 10 of the protrusion plate 20 are formed in an oval shape when viewed from the direction perpendicular to the surface of the protrusion plate 20, and uncured resin is applied in the direction of the major axis of the ellipse in the protrusion 10. Supply along. Therefore, the flow of the uncured resin is made smoother from the gap 52a toward the gap 52b.

  Furthermore, since the space formed between the vacuum bag 60 and the lower mold 50 is depressurized, the uncured resin can be more easily impregnated into the second fiber sheet 40 more easily, The supply pressure of the uncured resin from the line 56 can be lowered.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. Since this embodiment is different from the first embodiment only in the protruding plate 120, only this will be described. As shown in FIGS. 7 and 8, the protruding plate 120 in the present embodiment uses a four-axis assembly fabric 104 instead of the glass cloth 4 as the first fiber sheet.

  Here, as shown in FIG. 8, the four-axis assembly fabric 104 includes, in order from the top, a warp 111 as a continuous glass fiber bundle, an oblique yarn 112 that intersects with the warp 111 at an angle of −45 °, and a warp 111. A weft 113 inclined about 90 ° with respect to the warp, a weft 114 inclined about 90 ° with respect to the warp 111, an oblique yarn 115 intersecting with the warp 111 at an angle of 45 °, and a warp 116 parallel to the warp 111. And. In each yarn, the portion overlapping with the other yarns in the vertical direction is bonded with resin. Since such a four-axis assembly fabric 104 has a rough weave and a so-called open structure, as shown in FIG. 7, a hole (through hole) that penetrates in a direction orthogonal to the main surface of the four-axis assembly fabric 104 is provided. A plurality of 130 are formed.

  Each yarn of the four-axis assembly fabric 104 is formed with a resin layer 106 by being impregnated with a resin and cured, and the fiber sheet is reinforced by the four-axis assembly fabric 104 and the resin layer 106. 108 is formed. In the resin sheet 108 of the present embodiment, the resin layer 106 is formed so as not to block the hole 130 of the four-axis assembly fabric 104.

  Further, a plurality of projections 10 similar to those in the first embodiment are provided on the surface of the resin sheet 108. Such a protruding plate 120 can be easily manufactured using a punching metal plate similar to that of the first embodiment.

  Even if such a protruding plate 120 is used, a method for manufacturing a fiber-reinforced resin structure that exhibits the same effects as those of the first embodiment can be implemented.

(Third embodiment)
Subsequently, a third embodiment of the present invention will be described with reference to FIG. This embodiment is different from the second embodiment in that a projection plate 220 in which a plurality of projections 10 are formed on both surfaces of the resin sheet 108 is used, and a second plate is sandwiched between the projection plates 220. The fiber sheet 40 is disposed. Specifically, the reinforcing base material layer 42 is placed on the lower mold 50 in the order of the plurality of second fiber sheets 40 / projection plates 220 / the plurality of second fiber sheets 40.

  According to such an embodiment, the uncured resin easily reaches the surface of the second fiber sheet 40a on each of the upper and lower surfaces of the protruding plate 220, or the second fibers on both sides of the protruding plate 220. The sheet 40a, 40, 40 can be sufficiently impregnated with uncured resin. Therefore, the effect is particularly high when the reinforced substrate layer 42 is thick.

  In addition to this, the protruding plate 220 of the present embodiment has a large number of holes 130 penetrating in the direction perpendicular to the protruding plate 220, like the protruding plate 120 of the second embodiment. It is possible to pass through the protruding plate 120 in the vertical direction of the plate 120, and the uncured resin can be efficiently impregnated with the second fiber sheet 40. For example, the projection plate 20 as in the first embodiment having no hole 130 can be used.

(Fourth embodiment)
Subsequently, a fourth embodiment of the present invention will be described with reference to FIG. This embodiment is different from the first embodiment in that a VaRTM (Vacuum Assisted Resin Transfer Molding) method is adopted instead of the vacuum infusion method. Specifically, instead of the vacuum bag 60, an upper mold 52 made of metal or the like having a predetermined surface shape is used. Also in this embodiment, there exists an effect similar to 1st embodiment.

  In addition, this invention is not limited to the said embodiment, It can take various deformation | transformation aspects.

  For example, in the first embodiment, one protruding plate 20 is used as the uppermost layer or the lowermost layer of the reinforced base material layer 42, but two protruding plates 20 are used as the uppermost layer and the lowermost layer of the reinforced base material layer 42. May be. Further, the protruding plate 20 may be further added as the uppermost layer and / or the lowermost layer of the reinforcing base material layer 42 in the third embodiment (see FIG. 9).

  Moreover, in the said embodiment, although the protrusion 10 was made into the ellipse shape seeing from the direction perpendicular | vertical to the surface of the resin sheets 8 and 108, implementation is also possible as other shapes, such as circular shape and a rectangular shape.

  Moreover, in the said embodiment, although the surface of the lower side shaping | molding die 50 is planar, it cannot be overemphasized that the surface shape of the lower side shaping | molding die 50 may be changed according to the shape of the fiber reinforced resin structure to manufacture. In this case, a projection plate having a first resin sheet preformed so as to conform to the shape may be used.

  Furthermore, in the said embodiment, although the inside of the space which supplies uncured resin is pressure-reduced, implementation is possible even if it press-fits uncured resin with a normal pressure.

  Moreover, in the said embodiment, although the material of the resin layer 6 of the resin sheet 8 in the protrusion board 20 and the material of the protrusion 10 are the same, if protrusion 10 adhere | attaches the resin layer 6 fully, it will differ from each other material. But it ’s okay.

  Subsequently, an example according to the present embodiment will be described.

(Example 1)
First, a protruding plate was created. In this embodiment, two plies of glass cloth as a first fiber sheet are placed on a punching plate in which long holes are arranged in a staggered manner, and an uncured resin is impregnated from the glass cloth to be cured and projected. A plate was made. WE181 (manufactured by Nitto Boseki Co., Ltd.) was used as the glass cloth. As the resin, Rigolac 158BQT (manufactured by Showa Polymer Co., Ltd.), which is an unsaturated polyester resin, was used.

  Here, the length in the major axis direction of the ellipse of the protrusion was 9 mm, the length of the ellipse in the minor axis direction was 3 mm, and the height of the protrusion was 1 mm. Further, the distance between the long axes between the protrusions was 4 mm, and the distance between the protrusions in the short axis direction was 3 mm. Furthermore, the thickness of the resin sheet not including protrusions was 0.8 mm. The protrusion was formed only on one side of the protrusion plate.

  Subsequently, using such a protruding plate, the ease of flow of uncured resin during molding was evaluated. First, such a protruding plate was cut into a 300 mm square. Further, a glass chopped strand mat MC900A (manufactured by Nitto Boseki Co., Ltd.) and a glass roving cloth WR800 (manufactured by Nitto Boseki Co., Ltd.) were adopted as the second fiber sheet, and a plurality of sheets were cut into 300 mm squares. Hereinafter, the glass chopped strand mat MC900A is referred to as M, and the glass glass roving cloth WR800 is referred to as R. And it is laminated | stacked like a projection board / M / R / M / R / M / R / M in order from the bottom on the surface side flat lower mold, and this reinforced base material layer is made. Covered with a vacuum bag. Here, the protrusions of the protrusion plate were laminated so as to face upward.

  And while supplying unsaturated polyester resin (Dainippon Ink and Chemicals Co., Ltd. polylite PC184) from the one end side of the direction parallel to the long axis of the ellipse of the protrusion in the reinforced substrate layer, a vacuum pump is used from the other end side. The gas was discharged and decompressed, and the time change of the flow front position of the resin, that is, the movement position of the flow front in the time history was measured. Here, specifically, resin supply and gas exhaust were performed via spiral hoses provided at both ends of the reinforced substrate layer. A resin supply line and a gas exhaust line were connected to the center of each of the spiral hoses.

(Example 2)
A projecting plate was obtained in the same manner as in Example 1 except that 190 g / m ² of a four-axis assembly fabric KQ190 (manufactured by Nitto Boseki Co.) was used as the first fiber sheet used for the projecting plate. . The glass yarn of the four-axis assembly fabric KQ190 was RS28PR-520 (yarn thickness was 280 Tex). Moreover, the thickness of the resin sheet which does not contain the projection part in a projection board was 0.9-1.0 mm. This protruding plate has a large number of through holes penetrating the front and back.

  Then, the flow front is moved in the time history in the same manner as in Example 1 except that the stacking order is M / R / M / R / projection plate / M / R / M / R / M in order from the bottom. The position was measured.

(Comparative Example 1)
The movement position of the flow front in the time history was measured in the same manner as in Example 1 except that the protruding plate was not used. In this comparative example, the experiment was performed three times.

(Comparative Example 2)
Instead of the projection plate, the moving position of the flow front in the time history was measured in the same manner as in Example 2 except that a four-axis assembly fabric that was impregnated with resin and did not form projections was used.

  The results of the moving speed of the flow front in Examples 1 and 2 and Comparative Examples 1 and 2 are shown in FIG.

  As is clear from this result, it can be seen that in Examples 1 and 2 using the protruding plate, uncured resin flows very easily compared to Comparative Examples 1 and 2 that do not use the protruding plate. As in the prior art, even in Comparative Example 2 using a four-axis assembly fabric (mesh sheet) without protrusions, the fluidity is certainly slightly improved as compared with Comparative Example 1, but Example 1 of the present invention. The fluidity of No. 2 is remarkably improved as compared with the case of using a mesh sheet.

It is a section of a projection board used for a manufacturing method of a fiber reinforced resin structure concerning a first embodiment. FIG. 2 is a perspective view of a protruding plate in FIG. 1. It is a schematic sectional drawing explaining the manufacturing method of the projection board of FIG. It is a schematic cross section explaining the manufacturing method of the fiber reinforced resin structure of FIG. It is a partially broken top view of FIG. It is a schematic cross section which shows the modification of the manufacturing method of the fiber reinforced resin structure which concerns on 1st embodiment. It is a perspective view of the projection board used for the manufacturing method of the fiber reinforced resin structure which concerns on 2nd embodiment. It is sectional drawing of the projection board of FIG. It is a schematic cross section explaining the manufacturing method of the fiber reinforced resin structure concerning a third embodiment. It is a schematic cross section explaining the manufacturing method of the fiber reinforced resin structure concerning a fourth embodiment. It is a graph which shows the fluidity | liquidity of uncured resin in Examples 1, 2 and Comparative Examples 1, 2.

Explanation of symbols

  4 ... Glass cloth (first fiber sheet), 8 ... Resin sheet, 10 ... Protrusion, 20 ... Projection plate, 40, 40a ... Glass cloth (second fiber sheet), 50 ... Lower mold, 52 ... Upper Mold: 60 ... Vacuum bag (flexible film), 70 ... Uncured resin, 130 ... Hole (through hole).

Claims (9)

A step of preparing a resin sheet reinforced by the first fiber sheet, a protrusion plate having a plurality of protrusions provided on the surface of the resin sheet, and a second fiber sheet;
Placing the protruding plate and the second fiber sheet on a lower mold such that a plurality of protrusions of the protruding plate are in contact with the second fiber sheet;
Covering the lower mold with an upper mold or a flexible film so as to cover the second fiber sheet and the protruding plate;
Supplying uncured resin between the lower mold and the upper mold or the flexible film;
A step of curing the uncured resin, and a method for producing a fiber-reinforced resin structure.   The fiber reinforced resin according to claim 1, wherein, in the step of supplying the uncured resin, the pressure between the lower mold and the upper mold or the flexible film is reduced to a state lower than atmospheric pressure. Manufacturing method of structure. In the step of preparing the protrusion plate and the second fiber sheet, a plurality of the second fiber sheets are prepared, and the protrusion plate is provided with the plurality of protrusions provided on both surfaces of the resin sheet. And
In the step of placing the protruding plate and the second fiber sheet, the protruding plate and the second fiber sheet are placed on the lower mold so as to sandwich the protruding plate between the second fiber sheets. The manufacturing method of the fiber reinforced resin structure of Claim 1 or 2 mounted in this.   The plurality of protrusions in the protrusion plate each have an oval shape when viewed from a direction perpendicular to the surface of the resin sheet, and the major axes of the ellipses in the plurality of protrusions are parallel to each other. 4. The method for producing a fiber-reinforced resin structure according to any one of 3 above.   The manufacturing method of the fiber reinforced resin structure as described in any one of Claims 1-4 in which the through-hole which penetrates front and back is formed in the said projection board.   A resin sheet reinforced with a first fiber sheet, and a protrusion plate having a plurality of protrusions provided on at least one surface of the resin sheet.   The protrusion plate according to claim 6, wherein the plurality of protrusions are respectively provided on both surfaces of the resin sheet.   The plurality of protrusions are each formed in an oval shape when viewed from a direction perpendicular to the surface of the resin sheet, and major axes of the ellipses in the plurality of protrusions are parallel to each other. Protrusion plate.   The projection plate according to claim 6, wherein a plurality of through holes penetrating the front and back surfaces are formed.

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