Molded article and method for manufacturing the same

Abstract

The present invention provides a method for manufacturing a molded body having an R-shaped portion by laminating multiple sheets of prepreg, which allows for easy molding of the R-shaped portion to the desired shape, dimensional accuracy, and quality according to the design targets. [Solution] A method for manufacturing a molded body in which multiple sheet-like prepregs are laminated in a mold having an R-shaped section, wherein, in the prepreg lamination process, at least one of the prepregs laminated in the prepreg lamination process, other than the prepreg that is in contact with the mold surface of the mold, has at least a portion of the prepreg shape corresponding to the R-shaped section of the mold formed into a wavy shape in which the entire prepreg layer is minutely wavy in the thickness direction of the prepreg, using a means for imparting irregularities.

Description

[[Technical Field]]

[0001] The present invention relates to a method for producing a molded body, the method comprising a step of laminating, in a mold, a plurality of sheet-shaped prepregs each formed by impregnating a reinforcing fiber base material with a matrix resin composition, and to a molded body produced by said method. [[Background Art]]

[0002] Molded bodies of fiber-reinforced plastic (FRP), particularly carbon fiber-reinforced plastic (CFRP), produced by laminating sheet-shaped prepregs obtained by impregnating a reinforcing fiber base material with a matrix resin composition are lightweight and can exhibit high strength and high rigidity, and thus are widely used in various fields. Among these, they are broadly applied to various housings, cases, covers and the like. Most of such housings, cases, covers and the like more or less have an R portion (in the present application, an R portion refers to: a portion where a bent portion or curved portion having a round with a certain radius of curvature is continuously formed between two surfaces (a two-contact surface structural portion), or a portion continuously formed between three surfaces (a three-contact surface structural portion), or a portion formed as part of a spherical body having a round with a certain radius of curvature (a spherical body structural portion)). When an FRP molded body having such a shape is produced, the R portion of the molded body may be required to have relatively high shape accuracy and good quality.

[0003] In the manufacturing of molded articles having such R-shaped sections, generally in the design, for example, in the R-shaped section, as illustrated in Figure 3, the ideal design structure for an R-shaped section continuously formed between two surfaces is such that the radius of curvature Ro of the R-shaped section of the outer prepreg 102a in contact with the mold 101 is smaller than the radius of curvature Ri of the R-shaped section of the inner prepreg 102b by the thickness Lt of the prepreg laminate 103 (Ri = Ro - Lt). However, in actual molding, when the prepreg 102 is formed while being laminated on the mold 101, and then the molded article is obtained by heating and curing it in an autoclave or the like while vacuum pressurized in a film bag, the thickness of the prepreg when it is laminated (before curing) is larger than the thickness of the prepreg after curing. As a result, the length difference of the R-shaped section arc length before and after curing is insufficient, and the prepreg on the opposite side of the mold bridges.

[0004] Therefore, as illustrated in Figure 4, dimensional defects may occur, such as the thickness of the prepreg laminate 103 in the R section becoming larger or the internal dimensions of the R section deviating significantly from the design target. In addition, since the R section inevitably has a lower fiber content, there is a risk that the physical properties will not be as designed. Furthermore, as illustrated in Figure 5, there is a risk that excessive bending or fiber breakage 104 may occur locally in the reinforcing fiber substrate in the R section.

[0005] Furthermore, as illustrated in Figure 6, localized voids 105 may occur in the R section, which may significantly reduce both dimensional accuracy and structural strength. Additionally, the frequent occurrence of voids may degrade the aesthetic quality.

[0006] Furthermore, even when lamination is performed with a margin on the prepreg substrate, it is difficult to control the laminate during molding, and as illustrated in Figure 7, localized wrinkles 106 and folds 107 may occur, which may result in shape defects or reinforcing fiber breakage in the R portion.

[0007] Patent Document 1 discloses a technique that uses a jig placed on a male mold jig to cover a shaped laminated composite material and maintain a uniform thickness of the laminated composite material even after hardening. However, this technique requires a special jig and is only applicable to male molds.

[0008] Patent Document 2 discloses a technique for separating the continuous reinforcing fibers of the laminated prepreg at the R portion, but the separation of the continuous reinforcing fibers is likely to cause a significant decrease in strength at the R portion of the molded product.

[0009] Patent Document 3 discloses a technique for adding a layer of prepreg to the outside of the R-shaped section, but this structure results in the addition of unnecessary material from the perspective of the molded product's structural design. [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] Japanese Patent Publication No. 2007-15351 [Patent Document 2] Japanese Patent Publication No. 2022-47312 [Patent Document 3] Japanese Patent Publication No. 2016-117202 [Overview of the project] [Problems that the invention aims to solve]

[0011] As described above, in conventional technology, when manufacturing a molded body that involves a process of laminating multiple sheets of prepreg inside a mold, it is difficult to easily mold the R-shaped portion to the desired shape, dimensional accuracy, and quality as per the design target without adding unnecessary material or causing a significant decrease in strength.

[0012] Therefore, the object of the present invention is to provide a method for manufacturing a molded body having an R-shaped portion, which involves a step of stacking multiple sheet-like prepregs in a mold, and which allows the R-shaped portion to be easily molded to the desired shape, dimensional accuracy, and quality as per the design target, without adding unnecessary material or causing a significant decrease in strength, and a molded body manufactured by the same method. [Means for solving the problem]

[0013] To solve the above problems, the present invention adopts the following configuration. (1) A method for manufacturing a molded article, comprising a prepreg lamination step of laminating a plurality of sheet-like prepregs, each sheet-like prepreg impregnated with a matrix resin composition and containing continuous reinforcing fibers, into a mold having an R portion, while shaping them to conform to the shape of the mold, characterized in that, for at least one of the prepregs laminated in the prepreg lamination step, excluding the prepreg in contact with the mold surface of the mold, at least a portion of the prepreg shape corresponding to the R portion of the mold is formed into a wavy shape in which the entire layer of prepreg is minutely wavy in the thickness direction of the prepreg using a means for impregnating irregularities. (2) The method for manufacturing a molded article according to (1), wherein each time a prepreg other than the prepreg in contact with the mold surface of the molding die is laminated, the wavy shape is formed on the prepreg. (3) The method for manufacturing a molded article according to (1) or (2), wherein the wavy shape is formed over the entire area of ​​the prepreg shape portion corresponding to the R portion of the mold. (4) A method for manufacturing a molded article according to any one of (1) to (3), wherein the wavy shape is formed in a prepreg region that extends beyond the entire area of ​​the prepreg shape portion corresponding to the R portion of the mold. (5) A method for manufacturing a molded article according to any one of (1) to (4), wherein the wavy shape is formed on prepregs equal to or greater than the number of prepreg layers laminated in the latter half of the prepreg lamination process. (6) A method for manufacturing a molded article according to any one of (1) to (5), wherein the means for imparting the irregularities is to use a hammer equipped with a striking surface having minute irregularities, and to form the wavy shape by striking the laminated prepreg with the hammer. (7) A method for manufacturing a molded article according to any one of (1) to (6), wherein the difference in height of the waves of the undulating shape is in the range of 0.1t to 2.0t with respect to the thickness t of one prepreg layer. (8) A method for manufacturing a molded article according to any one of (1) to (7), wherein the R portion is formed continuously between two or three inner surfaces of the mold, or is formed as part of a spherical body. (9) A method for manufacturing a molded article according to any one of (1) to (8), wherein the reinforcing fiber base material includes unidirectional reinforcing fibers or a reinforcing fiber fabric. (10) A method for producing a molded article according to any one of (1) to (9), wherein the reinforcing fiber base material includes carbon fibers. (11) A method for manufacturing a molded article according to any one of (1) to (10), comprising the step of covering the prepreg laminate with a film bag after the prepreg lamination step, reducing the pressure inside the film bag, pressurizing the prepreg laminate with the film bag, and heat-curing the prepreg laminate. (12) A molded article manufactured from a prepreg laminate prepared by any of the methods described in (1) to (10). [Effects of the Invention]

[0014] According to the present invention, among the prepregs laminated in the prepreg laminating step, for at least one layer of prepreg other than the prepreg in contact with the mold surface of the molding die, at least a part of the prepreg shaped portion corresponding to the R portion of the molding die (the R portion of the prepreg laminate) is formed into a wavy shape in which the entire layer of the prepreg slightly undulates in the thickness direction of the prepreg using unevenness imparting means. Therefore, shape defects such as bridging in the prepreg layer can be easily avoided, and the entire R portion of the prepreg laminate can be molded into a desired shape as designed (inner and outer curvature radii as designed, etc.), dimensional accuracy (thickness as designed, etc.), and quality (no voids, no broken reinforcing fibers, development of strength and the like as designed), making it possible to produce a desired molded article. [Brief Description of the Drawings]

[0015] [Figure 1] FIG. 1 is a schematic configuration diagram showing a method for producing a molded article according to an embodiment of the present invention. [Figure 2] FIG. 2 is a partial perspective view of a molding die having an R portion for which the effect of the present invention is particularly effective. [Figure 3] FIG. 3 is a schematic partial cross-sectional view of a molding die and a prepreg laminate showing the ideal designed structure of the R portion in the present invention. [Figure 4] FIG. 4 is a schematic partial cross-sectional view of a molding die and a prepreg laminate showing an example of a defect in the R portion. [Figure 5] FIG. 5 is a schematic partial cross-sectional view of a molding die and a prepreg laminate showing another example of a defect in the R portion. [Figure 6] FIG. 6 is a schematic partial cross-sectional view of a molding die and a prepreg laminate showing still another example of a defect in the R portion. [Figure 7] FIG. 7 is a schematic partial cross-sectional view of a molding die and a prepreg laminate showing yet another example of a defect in the R portion. [Mode for Carrying Out the Invention]

[0016] Hereinafter, the present invention will be described in detail together with embodiments with reference to the drawings. Figure 1 shows a method for manufacturing a molded article according to one embodiment of the present invention. The method for manufacturing a molded article according to the present invention includes a prepreg lamination step in which multiple sheet-like prepregs 3, each containing a reinforcing fiber base material with continuous reinforcing fibers impregnated with a matrix resin composition, are laminated in a mold 2 having an R portion 1, while being shaped to conform to the shape of the mold 2. Of the prepregs 3 laminated in this prepreg lamination step, at least one layer of prepregs 3b other than the prepreg 3a that contacts the mold surface of the mold 2 (in the illustrated example, at least multiple prepregs 3b laminated in the latter half of the prepreg lamination step) has a prepreg shape portion 4 corresponding to the R portion 1 of the mold 2 (i.e., at least a portion of the prepreg laminate in this portion) formed into a wavy shape 6 in which the entire layer of prepregs 3 is minutely wavy in the thickness direction of the prepregs 3 by using a means for impregnation 5.

[0017] Regarding the formation of the wavy shape 6 of the prepreg 3 by the unevenness-forming means 5, it is particularly preferable to form the wavy shape 6 on each prepreg 3b, other than the prepreg 3a that is in contact with the mold surface of the mold 2, each time a prepreg 3b is laminated, because this ensures that the desired wavy shape 6 can be reliably formed within the prepreg shape portion 4. However, it is also possible to form the wavy shape 6 each time multiple layers of prepreg 3b are laminated.

[0018] Preferably, the above-mentioned wavy shape 6 is formed over the entire area (region θ1) of the prepreg shape portion 4 corresponding to the R portion 1 of the mold 2, thereby more reliably eliminating the aforementioned problems over the entire area of ​​the prepreg shape portion 4 corresponding to the R portion 1. Furthermore, the above-mentioned wavy shape 6 is formed in the prepreg region (region θ2) beyond the entire area of ​​the prepreg shape portion 4 corresponding to the R portion 1 of the mold 2 (in the illustrated example, the linear cross-sectional region θ beyond the entire area θ1 of the prepreg shape portion 4). 3、 Up to θ4 (θ2=θ1+θ 3+ If θ4)) is formed in this manner, the likelihood of a wavy shape 6 being reliably formed across the entire area of ​​the prepreg-shaped portion 4 corresponding to the R portion 1 is increased, which is therefore preferable.

[0019] The number of prepreg 3b layers on which the wavy shape 6 is formed is not particularly limited, but it is preferable to form the wavy shape 6 on at least as many prepreg 3b layers as the number of prepreg 3b layers that are laminated in the latter half of the aforementioned prepreg lamination process.

[0020] The means 5 for creating the uneven surface is not particularly limited as long as it can form a desired wavy shape on the prepreg 3b as described above, but a means that can easily form the desired wavy shape with simple operation is preferred. In particular, as shown in the figure, it is preferable to use a hammer equipped with a striking surface 5a having minute uneven surfaces as the means 5 for creating the uneven surface, and to form the wavy shape 6 by striking the laminated prepreg 3b with the hammer, from the viewpoint of ease of operation and reliability of creating the uneven surface.

[0021] The size of the wavy shape 6 formed on the prepreg 3b can be expressed by the difference in wave height of the wavy shape 6, and it is preferable that the difference in wave height of the wavy shape 6 is in the range of 0.1t to 2.0t with respect to the thickness t of one layer of the prepreg 3b.

[0022] In order to form a wavy shape 6 within the preferred range described above on the prepreg 3b, a hammer as shown in the figure can be used as the unevenness-forming means 5, and the wavy shape 6 can be formed by striking the laminated prepreg 3b with the hammer. In this case, not all of the irregularities on the hammer's striking surface 5a will necessarily penetrate the prepreg surface, and springback occurs in the prepreg 3b (especially in its reinforcing fiber base layer), causing the irregularities on the prepreg 3b to return to their original shape before the irregularities were formed. Therefore, it is preferable that the size of the irregularities on the hammer's striking surface 5a (the difference in the height of the waves) is slightly larger than the target value of the difference in the wave height of the wavy shape 6 formed on the prepreg 3b. However, the unevenness-forming means 5 is not limited to a hammer as shown in the figure; a pressing means having a surface with a desired size of irregularities (difference in the height of the waves) can also be used.

[0023] By forming the above-described wavy shape 6 on the prepreg 3b, that is, by forming the above-described wavy shape 6 on the prepreg shape portion 4 corresponding to the R portion 1 of the mold 2, each layer of the prepreg 3b before resin curing, especially its reinforcing fiber base layer, has a shape that has leeway against deformation and displacement before and after curing, thus preventing the aforementioned problems (such as an increase in the thickness of the prepreg laminate in the R portion as shown in Figure 4, dimensional defects such as the internal dimensions of the R portion deviating significantly from the design target, and material defects due to a lower fiber content in the R portion). This prevents issues such as reduced performance, excessive bending and fiber breakage of the reinforcing fiber base material in the R-shaped section as shown in Figure 5, the occurrence of localized voids in the R-shaped section as shown in Figure 6, resulting in reduced dimensional accuracy and strength, and a decrease in design quality due to the frequent occurrence of voids, as well as the occurrence of localized wrinkles and folds as shown in Figure 7, resulting in poor shape and reinforcing fiber breakage in the R-shaped section. This prevents a decrease in the dimensional accuracy (thickness, radius of curvature, etc.) and strength of the R-shaped section of the molded body after molding, and also prevents a decrease in quality due to the occurrence of voids, etc.

[0024] The effects of the present invention described above are particularly obtainable for the shapes shown in Figure 2. Specifically, Figure 2 illustrates the shapes of molds from which the present invention provides effective results. In the present invention, the target effects are particularly obtained when, as shown in Figure 2(A), the R portion 12 of the mold 11 (corresponding to the R portion of the molded body to be molded) is configured as a portion in which a bent or curved portion having a certain radius of curvature is continuously formed between two surfaces (a two-faceted structure portion); as shown in Figure 2(B), the R portion 22 of the mold 21 is configured as a portion in which a bent or curved portion having a certain radius of curvature is continuously formed between three surfaces (a three-faceted structure portion); or as shown in Figure 2(C), the R portion 32 of the mold 31 is configured as a portion having a certain radius of curvature and formed as part of a spherical body (a spherical structure portion).

[0025] The sheet-like prepreg used in the prepreg lamination process in the method for manufacturing a molded article according to the present invention, as described above, consists of a reinforcing fiber base material containing continuous reinforcing fibers impregnated with a matrix resin composition. The type of continuous reinforcing fiber is not particularly limited, and examples include various reinforcing fibers such as polyacrylonitrile (PAN), rayon, lignin, and pitch-based carbon fibers, glass fibers, and aramid fibers. In particular, carbon fibers are highly effective in preventing bridging, reinforcing fiber breakage, and abnormal bending of the prepreg according to the present invention. These reinforcing fibers may also be surface-treated. Examples of surface treatments include treatment with coupling agents, treatment with sizing agents, treatment with binding agents, and treatment with additives. Furthermore, one type of reinforcing fiber may be used alone, or two or more types may be used in combination. From the viewpoint of obtaining a lightweight, high-strength, and high-rigidity molded article, it is preferable that carbon fibers be included as continuous reinforcing fibers. The form of the fiber layer containing the continuous reinforcing fibers is also not particularly limited, and may be in the form of a unidirectional material in which the continuous reinforcing fibers are oriented in one direction, or in the form of a woven fabric containing continuous reinforcing fibers.

[0026] The matrix resin of the matrix resin composition is not particularly limited, and thermosetting resins such as epoxy resins, unsaturated polyester resins, vinyl ester resins, phenol (resol type) resins, and polyimide resins can be used. In addition, polyester resins such as polyethylene terephthalate (PET) resin, polybutylene terephthalate (PBT) resin, polytrimethylene terephthalate (PTT) resin, polyethylene naphthalate (PEN) resin, and liquid crystal polyester resin can be used, as well as polyolefin resins such as polyethylene (PE) resin, polypropylene (PP) resin, and polybutylene resin, polyarylene sulfide resins such as polyoxymethylene (POM) resin, polyamide (PA) resin, and polyphenylene sulfide (PPS) resin, polyketone (PK) resin, polyetherketone (PEK) resin, polyetheretherketone (PEEK) resin, and poly In addition to fluororesins such as ethernitrile (PEN) resin and polytetrafluoroethylene resin, crystalline resins such as liquid crystal polymer (LCP), and styrene resins, amorphous resins such as polycarbonate (PC) resin, polymethyl methacrylate (PMMA) resin, polyvinyl chloride (PVC) resin, polyphenylene ether (PPE) resin, polyimide (PI) resin, polyamide-imide (PAI) resin, polyetherimide (PEI) resin, polysulfone (PSU) resin, polyethersulfone resin, and polyarylate (PAR) resin can also be used. Furthermore, thermoplastic resins such as phenolic resins, phenoxy resins, polystyrene resins, polyolefin resins, polyurethane resins, polyester resins, polyamide resins, polybutadiene resins, polyisoprene resins, fluororesins, and acrylonitrile resins, as well as copolymers and modified versions thereof, can also be used. Among these, epoxy resins and vinyl ester resins are preferable when considering adhesion to carbon fibers, mechanical properties of the molded product, and moldability.

[0027] Furthermore, when carbon fiber is used as a reinforcing fiber, the weight fiber content of carbon fiber in the prepreg is preferably in the range of 15 to 80% by weight. More preferably, it is 30 to 70% by weight, and even more preferably, 45 to 60% by weight. If the content is less than 15% by weight, the load-bearing capacity and rigidity may be lost, and the product may not be able to perform the intended function. If the content exceeds 80% by weight, the possibility of voids forming in the matrix resin composition increases, which may make molding difficult.

[0028] In the method for manufacturing a molded article according to the present invention, which includes the prepreg lamination process described above, for example, by having a step after the prepreg lamination process in which the prepreg laminate is covered with a film bag, the inside is depressurized, the prepreg laminate is pressurized with the film bag, and the prepreg laminate is heat-cured, a molded article having the desired physical properties such as the shape and strength of the R portion can be manufactured.

[0029] In a molded article manufactured from a prepreg laminate produced by the manufacturing method of the present invention, traces of the wavy shape of the prepreg formed in the prepreg lamination process (especially traces of the wavy shape of the reinforcing fiber substrate) remain to a greater or lesser extent even in the molded article stage after the heat curing of the matrix resin composition. However, these traces do not substantially adversely affect the target design shape, target design properties, or quality of the molded article. Rather, they can be considered verifiable evidence of improved shape accuracy, quality, and strength, especially in the R portion, as they prevent the occurrence of voids and the breakage and abnormal bending of the reinforcing fibers. Traces of the wavy shape of the reinforcing fiber substrate can be confirmed in the molded article by observing the surface of the molded article after heat curing, and a more regular wavy shape can be observed compared to the surrounding area. Alternatively, the reinforcing fiber substrate remaining after the matrix resin composition has been burned off in the molded article may be examined. However, during the heat curing of the matrix resin composition, the size of the wavy shape of the reinforcing fiber substrate may be smaller than that in the prepreg lamination process due to the flow and deformation of the matrix resin composition under heating and pressurizing. Also, after the matrix resin composition is burned off, it is difficult to maintain the wavy shape of the reinforcing fiber substrate, so the difference in wave height is often mitigated, and in most cases it is smaller than the range of 0.1t to 2.0t relative to the thickness t of one prepreg layer. Nevertheless, if it is in the range of 0.1t to 1.5t relative to the thickness t of the layer, it can be inferred that the aforementioned condition that the difference in wave height of the wavy shape of the prepreg was in the range of 0.1t to 2.0t relative to the thickness t of one prepreg layer was largely satisfied. [Examples]

[0030] A prepreg laminate was formed by laminating sheet-like prepregs, each having a thickness in the range of 0.44 to 0.72 mm, which are reinforced fiber substrates containing continuous carbon fibers and impregnated with a matrix resin composition, and having the R-shaped portion shown in Figure 1. A molded body was then formed from this prepreg laminate, and the relationship between the wavy shape (wavy size) of the prepreg formed in the prepreg lamination process, the range of the wavy region, and the evaluation results under those conditions was investigated, as shown in Table 1. In Table 1, Vf represents the fiber volume content of the reinforcing fibers. From the results shown in Table 1, it was confirmed that if the difference in wave height of the wavy shape defined in the present invention is in the range of 0.1t to 2.0t relative to the thickness t of one prepreg layer at the prepreg laminate stage, the R-shaped portion as designed can be obtained.

[0031] [Table 1] [Industrial applicability]

[0032] This invention is not limited to various types of enclosures, cases, and covers, but can be used in all applications employing fiber-reinforced plastics, including internal structural materials, stiffening materials, and applications in automotive, aircraft, and industrial equipment. Its range of applications is not limited to these. [Explanation of symbols]

[0033] 1 R section 2 Molding mold 3, 3a, 3b prepregs 4 Prepreg shape corresponding to the R section 5 Unevenness imparting means 5a hitting surface 6. Wavy shape 11, 21, 31 mold 12, 22, 32 R section θ1, θ2, θ3, θ4 regions

Claims

1. A method for manufacturing a molded article, comprising a prepreg lamination step of laminating multiple sheet-like prepregs, each sheet-like prepreg impregnated with a matrix resin composition and containing continuous reinforcing fibers, into a mold having an R-shaped portion, while shaping them to conform to the shape of the mold, characterized in that, for at least one of the prepregs laminated in the prepreg lamination step, excluding the prepreg in contact with the mold surface of the mold, at least a portion of the prepreg shape corresponding to the R-shaped portion of the mold is formed into a wavy shape in which the entire prepreg layer is minutely wavy in the thickness direction of the prepreg using a means for impregnating irregularities.

2. The method for manufacturing a molded article according to claim 1, wherein each time a prepreg other than the prepreg in contact with the mold surface of the molding die is laminated, the wavy shape is formed on the prepreg.

3. The method for manufacturing a molded article according to claim 1, wherein the wavy shape is formed over the entire area of ​​the prepreg-shaped portion corresponding to the R portion of the mold.

4. The method for manufacturing a molded article according to claim 1, wherein the wavy shape is formed in a prepreg region that extends beyond the entire area of ​​the prepreg shape portion corresponding to the R portion of the mold.

5. The method for manufacturing a molded article according to claim 1, wherein the wavy shape is formed on prepregs equal to or greater than the number of prepreg layers laminated in at least the latter half of the prepreg lamination process.

6. The method for manufacturing a molded article according to claim 1, wherein the means for imparting the unevenness is a hammer equipped with a striking surface having minute unevenness, and the wavy shape is formed by striking the laminated prepreg with the hammer.

7. The method for manufacturing a molded article according to claim 1, wherein the difference in height of the waves in the undulating shape is in the range of 0.1t to 2.0t with respect to the thickness t of one prepreg layer.

8. The method for manufacturing a molded article according to claim 1, wherein the R portion is formed continuously between two or three inner surfaces of the mold, or is formed as part of a spherical body.

9. The method for manufacturing a molded article according to claim 1, wherein the reinforcing fiber base material includes unidirectional reinforcing fibers or a reinforcing fiber fabric.

10. The method for manufacturing a molded article according to claim 1, wherein the reinforcing fiber base material includes carbon fibers.

11. A method for manufacturing a molded article according to any one of claims 1 to 10, further comprising the step of covering the prepreg laminate with a film bag, reducing the pressure inside the film bag, pressurizing the prepreg laminate with the film bag, and heat-curing the prepreg laminate.

12. A molded article manufactured from a prepreg laminate prepared by any one of claims 1 to 10.

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