JP2009248552A - Method for producing fiber-reinforced resin molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a fiber-reinforced resin molding which can prevent defective impregnation with a matrix resin and the elongation of an impregnation time when a molding having a thick wall or a molding having high strength is obtained and is high in productivity. <P>SOLUTION: A reinforcing fiber layer is divided in the thickness direction into a plurality of division layers, and a resin diffusing medium is held between the division layers. The reinforcing fiber layer is impregnated with a matrix resin supplied into an airtight space while the matrix resin is diffused by the resin diffusing medium on the surface of the reinforcing fiber layer and between the division layers. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing a fiber-reinforced resin molded article.

Since the manufacturing method of the fiber reinforced resin molded product is lightweight but has high strength, as a manufacturing method of this fiber reinforced resin molded product used in various industrial fields, recently, as shown in Patent Document 1 Vacuum injection molding methods such as an infusion molding method that is excellent in environmental considerations have attracted attention.
In the infusion molding method, a laminate of reinforcing fiber layers as impregnated materials and a resin diffusion medium that promotes diffusion of a matrix resin impregnated on the uppermost surface of the laminate are laid on a mold, The resin diffusion medium is covered with an airtight film, the laminate is accommodated in an airtight space formed between the airtight film and the mold, and after the pressure inside the airtight space is reduced from atmospheric pressure, this reduced pressure state is maintained. This is a method for producing a fiber reinforced resin molded article in which a matrix resin is supplied from outside the hermetic space to the inside of the hermetic space while being maintained, and the reinforced fiber layer is impregnated while diffusing the matrix resin through the resin diffusion medium.
According to this molding method, since molding is performed in a sealed space in an airtight space, volatilization of styrene, which is a raw material, can be prevented during production, and consideration can be given to the environment.
However, in this molding method, when obtaining a thick molded product or obtaining a molded product with high strength, the reinforcing fiber layer must be thickened or the reinforcing fiber density of the reinforcing fiber layer must be increased. In other words, it took too much time to complete the impregnation of the matrix resin, resulting in a very poor productivity, or it was difficult to impregnate the matrix resin and an unimpregnated portion remained.

Japanese Patent Laid-Open No. 2005-1306

  In view of the above circumstances, the present invention can prevent poor matrix resin impregnation and prolonged impregnation time even when obtaining a thick molded product or a molded product with high strength. It aims at providing the manufacturing method of a highly fiber-reinforced resin molded product.

  In order to achieve the above object, a method for producing a fiber-reinforced resin molded product according to the present invention is laid along a reinforcing fiber layer composed of reinforcing fibers along the mold surface of the mold and along the surface of the reinforcing fiber layer. The laminate including the resin diffusion medium is covered with an airtight film, the laminate is accommodated in an airtight space formed between the airtight film and a mold, and the inside of the airtight space is depressurized from atmospheric pressure. A method for producing a fiber reinforced resin molded article comprising a step of supplying a matrix resin from the outside of the airtight space to the airtight space while maintaining the reduced pressure state and impregnating the reinforcing fiber layer while diffusing the matrix resin through the resin diffusion medium The reinforcing fiber layer is divided into a plurality of divided layers divided in the thickness direction, the resin diffusion medium is sandwiched between the divided layers and the divided layers, and the matrix resin supplied into the airtight space is used as the reinforcing fiber layer. It is characterized by impregnating the reinforcing fiber layer while diffusing by the resin distribution medium between the divided layers surface of the resin distribution medium.

  In the production method of the present invention, a resin diffusion medium (hereinafter referred to as “surface diffusion medium”) disposed on the surface of the reinforcing fiber layer and a resin diffusion medium (hereinafter referred to as “interlayer diffusion medium”) disposed between the divided layers. Is for the purpose of accelerating the flow diffusion of the matrix resin and impregnating the matrix resin into the reinforcing fiber layer uniformly and quickly. Diffusion that allows the matrix resin to flow while diffusing using capillary action etc. If it has a flow path, it will not specifically limit, The resin diffusion medium (for example, GreenFlow75 by AIRTECH) conventionally used for infusion molding can be used.

  As a resin diffusion medium having such a structure, for example, glass fiber yarns (including monofilaments) as lower materials are arranged in parallel as shown in FIG. 6 and FIG. A glass fiber yarn or the like is disposed, and a contact portion between the fibers is bonded with the thermosetting resin or the thermoplastic resin, or the fibers are fused together, or FIG. Examples of the thermoplastic resin sheet-like injection-molded product having the shape as described above. Furthermore, what made glass fiber thread | yarn etc. into the woven fabric can also be used.

Glass fiber yarns and the like are not impregnated with the matrix resin between the fibers constituting the yarn, so that the diffusion flow of the matrix resin can be performed smoothly, and in order to ensure the strength of the resin diffusion medium, It is preferable to use a fiber in which the fibers are bound together by the thermosetting resin or the thermoplastic resin.
In addition, since the interlayer diffusion medium constitutes a part of the molded product, the material used for the interlayer diffusion medium is not the reinforcing fiber constituting the reinforcing fiber layer or the reinforcing fiber layer. It is preferable to use the same material as the matrix resin.

Since the interlayer diffusion medium is sandwiched between the divided layers, the reinforcing fibers constituting the upper and lower divided layers do not enter the diffusion flow path and prevent the matrix resin from flowing. There is a need.
Incidentally, when a resin diffusion medium having a structure as shown in FIGS. 6 to 8 is used, if the distance between the glass fiber yarns arranged in parallel becomes too large, the matrix resin does not flow smoothly between the glass fiber yarns. If the distance between the fiber yarns becomes too small, there is no space for the matrix resin to flow. Therefore, the distance between the glass fiber yarns is preferably about 2 to 5 mm.
Further, when the resin diffusion medium is a woven fabric, the weaving method is not particularly limited, and any weaving method such as plain weave, twill weave, satin weaving, etc. may be used. Does not flow smoothly, and if the texture becomes too small, there is no space for the matrix resin to impregnate, so the texture is preferably about 2 to 5 mm.

Regarding the strength of the interlayer diffusion medium, the thickness of the interlayer diffusion medium is maintained at 1 mm or more even when the diffusion flow path is subjected to atmospheric pressure due to reduced pressure in a reduced pressure atmosphere when impregnating the matrix resin. It is preferable that the strength be sufficient to ensure a space for a road.
The interlayer diffusion medium is not particularly limited in terms of its size, positions arranged between the divided layers, and the like as long as predetermined fluid diffusion can be performed, but at least a part of the interlayer diffusion medium extends from the edge of the reinforcing fiber layer to the outside of the reinforcing fiber layer. It is preferable that the matrix resin is provided so as to protrude, and the matrix resin is supplied to the protruding portion.

  Since the fiber-reinforced resin molded product manufacturing method of the present invention may be that the inside of the airtight space is in a decompressed state, the resin can be supplied after confirming the decompressed state and stopping the suction / exhaust operation. It is preferable to supply the matrix resin while sucking and exhausting the air in the airtight space from the air inlet to the outside of the airtight space and reducing the pressure in the airtight space.

  The arrangement of the resin supply port and the air intake port used in the present invention is appropriately determined according to the shape of the molded product, and is not particularly limited, but if the distance between the resin supply port and the air intake port is too close, the reinforcing fiber Since a situation occurs in which the matrix resin is sucked and discharged from the air intake port before the entire layer is not impregnated with the matrix resin, a reinforcing fiber layer is disposed between the resin supply port and the intake port, It is preferable to supply the matrix resin from the resin supply port while sucking and exhausting the air in the airtight space from the mouth to make the inside of the airtight space in a decompressed state, and it is arranged to be the farthest distance such as a diagonal shape. preferable.

  The method of supplying the matrix resin is not particularly limited as long as the matrix resin can be supplied into the airtight space, and the matrix resin is supplied to the resin supply port provided on the mold surface through the resin flow path provided in the mold. The resin may be supplied, and a tube having a plurality of resin supply ports is arranged so that the resin supply port faces the end of the reinforcing fiber layer, and an airtight space is formed from the gap between the airtight film and the mold. You may make it take out and fill a sealing material in the clearance gap between a pipe | tube, an airtight film, and a shaping | molding die. In addition, for pipes having a plurality of resin supply ports, for example, a spiral plastic resin called a spiral hose used to wrap and use electric cords or the like so that matrix resin can be supplied evenly. A tube having a structure in which resin oozes out from the entire circumference of the tube may be used.

  The method for sucking and exhausting air is not particularly limited as long as it is a method capable of sucking air in an airtight space, and is sucked and exhausted from an intake port provided on a mold surface through an intake passage provided in a mold. Alternatively, the pipe provided with the air inlet is arranged so that the resin supply port faces the end of the reinforcing fiber layer, and the pipe is taken out of the airtight space through the gap between the airtight film and the mold. You may make it fill a sealing material in the clearance gap between an airtight film and a shaping | molding die. Moreover, you may connect a pressure gauge so that the pressure in airtight space can be grasped | ascertained as needed.

  The number of resin supply ports and air intake ports used in the present invention is not particularly limited, and two or more may be provided. By providing a plurality of resin supply ports and air intake ports, the impregnation of the matrix resin can be promoted.

  The impregnation state of the matrix resin can be easily grasped because the color of the reinforcing fiber layer changes to the color of the matrix resin. The impregnation is completed when the color of the entire reinforcing fiber layer changes to the color of the matrix resin, when the matrix resin oozes from the end face of the reinforcing fiber layer, or when the air intake starts to suck the matrix resin. Etc. can be used as a guide.

The reinforcing fibers used in the present invention are preferably glass fibers, carbon fibers, and aramid fibers, but if necessary, polyvinyl alcohol fibers, vinyl chloride fibers, acrylic fibers, polyester fibers, polyurethane fibers, polyethylene fibers, polypropylene fibers, polystyrene fibers. Other organic synthetic fibers such as acetate fibers, other inorganic fibers such as metal fibers, natural fibers such as hemp and bamboo, and regenerated fibers such as rayon can also be used.
In addition, these fibers may be used as a mixture, or may be processed into a sheet state such as making the fibers into a mat shape or a cloth shape in order to develop more strength.

  The matrix resin used in the present invention can be appropriately selected according to the desired molded product, and is not particularly limited. For example, unsaturated polyester resin, acrylic resin, vinyl ester resin, alkyd resin, amino resin, epoxy resin, urethane resin Thermosetting resins such as phenol resin and silicone resin, polyethylene resin, polypropylene resin, polystyrene resin, polybutadiene resin, styrene butadiene resin, polyacetal resin, polyamide resin, polycarbonate resin, polyphenylene ether resin, polyethylene terephthalate resin, polybutylene terephthalate Resin, polyarylate resin, polystyrene resin, polyethersulfone resin, polyimide resin, polyamideimide resin, polyphenylene sulfide resin, polyoxyben Yl resins, polyether ether ketone resin, polyether imide resin, it is possible to use a thermoplastic resin such as cellulose acetate resin.

The matrix resin used preferably has a viscosity of 0.2 Pa · s or less in order to promote the impregnation of the reinforcing fiber layer. When the viscosity exceeds 0.2 Pa · s, it becomes difficult for the matrix resin to impregnate the reinforcing fiber layer, and the possibility of poor impregnation increases. Therefore, when the matrix resin used is a thermoplastic resin, it may be necessary to preheat the supplied resin to a molten state and to reduce the viscosity.
Note that an antioxidant, a flame retardant, a heat stabilizer, an ultraviolet absorber, a light stabilizer, and the like may be appropriately blended in the matrix resin in consideration of coloring pigments and durability after molding.

  The airtight film used in the present invention is a so-called bag film, and the material is not particularly limited as long as the space covered with the film can be kept airtight at the time of decompression. For example, polyamide, nylon resin It is preferable to use a film-like material.

  In the present invention, if necessary, a release cloth for promoting the peeling of the airtight film can also be used. Here, as the release cloth, it is preferable to use a silicon-coated nylon cloth having fine holes through which the resin can easily pass and having good release characteristics with the matrix resin. In addition, a release cloth is laid in the upper layer or lower layer of the resin diffusion medium mentioned later as needed.

  In the present invention, a sealing material is used to make the space covered with the airtight film airtight. The sealing material used here is not particularly limited as long as it can be kept in an airtight state so that air does not enter the airtight space during decompression, but a butyl rubber tape or the like is preferably used.

  In addition, the manufacturing method in this invention can be used not only for the manufacture of flat plate-shaped molded products, but also for the manufacturing of molded products of any shape such as curved, cylindrical, columnar and the like.

In the method for producing a fiber-reinforced resin molded article according to the present invention, the reinforcing fiber layer is divided into a plurality of divided layers divided in the thickness direction, a resin diffusion medium is sandwiched between the divided layers and the divided layers, and the air-tight space is formed. The supplied matrix resin is impregnated in the reinforcing fiber layer while being diffused by the resin diffusion medium on the surface of the reinforcing fiber layer and the resin diffusion medium between the divided layers.
Therefore, the matrix resin impregnated only from the uppermost surface of the reinforcing fiber layer in contact with the resin diffusion medium laid on the uppermost surface of the laminated reinforcing fiber layer, whereas in the present invention, from the inside of the reinforcing fiber layer as well. That is, the sandwiched resin diffusion medium impregnates the matrix resin also from the upper and lower reinforcing fiber layers in contact with the resin diffusion medium.
As a result, in the case of obtaining a thick molded product or a molded product having a high strength, it is possible to prevent poor impregnation of the matrix resin and prolonged impregnation time.

  In addition, by causing at least a part of the resin diffusion medium disposed between the divided layers to protrude from the edge of the reinforcing fiber layer to the outside of the reinforcing fiber layer, and supplying the matrix resin to the protruding portion, the matrix resin can be made faster. Since it can be supplied to the diffusion medium, the matrix resin can be more efficiently impregnated.

  Furthermore, if the matrix resin is supplied while the air in the airtight space is exhausted out of the airtight space from the intake port and the inside of the airtight space is sucked into the reduced pressure state, the matrix resin is simply impregnated into the reinforcing fiber layer by capillary action. Therefore, the reinforcing fiber layer can be more efficiently impregnated with the matrix resin, and a fiber-reinforced resin molded article free from poor impregnation can be produced.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
FIG. 1 is a schematic view showing a state before impregnation with a matrix resin in the first embodiment of the method for producing a fiber-reinforced resin molded product according to the present invention.
In FIG. 1, 1 is an interlayer diffusion medium, 2 is a surface diffusion medium, 3 is a release cloth, 4 is an airtight film, 5 is a resin supply pipe, 6 is an air intake pipe, 7 is a sealing material, and 8 is a reinforcing fiber layer. , 9 is a mold.

In this method for manufacturing a fiber-reinforced resin molded article, first, a reinforcing fiber is placed on a mold 9 to form a lowermost divided layer 81.
Next, the interlayer diffusion medium 1 is placed on the divided layer 81 so as to cover the entire upper surface of the divided layer 81 and partly protrude from the side surface of the divided layer 81.
And after repeating lamination | stacking of the division layer 81 and the interlayer diffusion medium 1 until it becomes the thickness of the desired molded article and obtaining the reinforced fiber layer 8 (in this embodiment, three division layers 81), the uppermost surface A release cloth 3 for facilitating release from the airtight film 4 after the matrix resin is cured is placed on the divided layer 81. A conventionally used surface diffusion medium 2 is placed on the release cloth 3 so as to protrude from the side surface of the reinforcing fiber layer 8 in the same manner as the interlayer diffusion medium 1. The order of the release cloth 3 and the surface diffusion medium 2 may be reversed as necessary.

Next, the resin supply pipe 5 is disposed such that the resin supply port (not shown) faces the protruding portion of the interlayer diffusion medium 1 and the surface diffusion medium 2 from the reinforcing fiber layer 8, and the air intake pipe 6 is formed of resin. The reinforcing fiber layer 8 is arranged between the supply pipe 5 and the supply pipe 5. The air intake pipe 6 is preferably disposed under the release cloth 3 in order to make it easier to suck the air in the reinforcing fiber layer 8.
Thereafter, the air-tight film 4 covers the interlayer diffusion medium 1, the surface diffusion medium 2, the release cloth 3, the reinforcing fiber layer 8, the resin supply port part of the resin supply pipe 5, and the air intake pipe 6. Between the mold 9 and the airtight film 4 and between the mold 9 and the resin supply pipe 5 and the air intake pipe 6 (not shown), the airtight film 4 and the resin supply pipe 5. The space between the air intake pipe 6 and the air intake pipe 6 is hermetically sealed using a sealing material 7 to form an airtight space S.

  Next, the air intake pipe 6 is connected to a vacuum pump (not shown), and the resin supply pipe 5 is connected to a container containing a matrix resin (not shown). Thereafter, the vacuum pump is operated, and the air in the airtight space S is sucked and exhausted from the suction port of the air intake pipe 6, and the pressure in the airtight space S is reduced to −0.08 MPa or less. After the pressure reduction is completed, the matrix resin in the container is removed from the resin supply port of the resin supply pipe 5 from the interlayer diffusion medium 1 and the reinforcing fiber layer 8 of the surface diffusion medium 2 while continuing the vacuum pump operation. Then, the reinforcing fiber layer 8 is impregnated while the matrix resin is diffused by the interlayer diffusion medium 1 and the surface diffusion medium 2. Here, the matrix resin first flows and diffuses into the interlayer diffusion medium 1 and the surface diffusion medium 2, and then the uppermost surface of the reinforcing fiber layer 8 in contact with the interlayer diffusion medium 1 and the surface diffusion medium 2 as shown in FIG. It diffuses in the surface direction in the inner layer and then impregnates in the thickness direction of the reinforcing fiber layer 8.

  As shown in FIG. 3, when the entire reinforcing fiber layer 2 is impregnated with the matrix resin, the suction exhaust and the supply of the matrix resin are stopped. Whether or not the matrix resin impregnation has been completed can be easily and accurately determined by observing the color change of the reinforcing fiber layer 2. That is, using FIG. 2 schematically showing the state during resin impregnation, when the matrix resin is impregnated, the color of the reinforcing fiber layer 2 changes from the color of the reinforcing fiber itself to the color of the matrix resin 11. Therefore, when the color change of the reinforcing fiber layer 2 is observed and it is confirmed that the color of the uppermost surface of the reinforcing fiber layer 2 is completely changed to the color of the matrix resin 11, the impregnation of the matrix resin into the reinforcing fiber layer 2 is completed. Can be easily grasped.

  Subsequently, when the matrix resin is a thermosetting resin, the matrix resin is cured by heating or by previously mixing a curing agent. When the matrix resin is a thermoplastic resin, the matrix resin is solidified by cooling the heated resin until it is in a molten state when supplied.

  Finally, after the matrix resin is cured or solidified, the airtight film 4, the surface diffusion medium 2, and the release cloth 3 are removed, and a protruding part of the interlayer diffusion medium 1 is cut out to obtain a molded product.

FIG. 4 is a schematic view showing a state before impregnation of the matrix resin in the second embodiment of the method for producing a fiber-reinforced resin molded product according to the present invention.
As shown in FIG. 4, in this method for manufacturing a fiber reinforced resin molded article, the interlayer diffusion medium 1 has substantially the same vertical and horizontal dimensions as the divided layer 81 so as not to protrude from the reinforcing fiber layer 8, and Instead, it is the same as FIG. 1 except that a gauze 10 is provided to assist impregnation. The gauze 10 is sandwiched between the divided layer 81 and the divided layer 81 in a state where a part of the gauze 10 overlaps the end of the interlayer diffusion medium 1. And after the matrix resin impregnation, it can be easily removed by pulling the gauze 10 before curing or solidification.

FIG. 5 is a schematic view showing a state before impregnation of the matrix resin in the third embodiment of the method for producing a fiber-reinforced resin molded product according to the present invention.
As shown in FIG. 5, in this method for manufacturing a fiber-reinforced resin molded article, the position where the edge on the air intake pipe 6 side of the upper interlayer diffusion medium 1 enters the resin supply pipe 5 side from the edge of the divided layer 81. Except that the end of the surface diffusion medium 2 on the air intake pipe 6 side is further positioned on the resin supply pipe 5 side. ing.
In this way, the impregnation of the matrix resin is completed in order from the lower layer of the divided layer 81, and the air in the reinforcing fiber layer 8 is discharged while being pushed up from the lower layer to the upper layer. Defects can be prevented.

The present invention is not limited to the above embodiment. For example, in the third embodiment, the matrix diffusion resin impregnation rate between the upper layer and the lower layer is adjusted by changing the size of the interlayer diffusion medium 1, but the interlayer diffusion medium 1 disposed in the upper layer The size of the interlayer diffusion medium 1 disposed in the lower layer is the same, and the impregnation speed is adjusted by changing the diffusion performance between the interlayer diffusion medium 1 disposed in the upper layer and the interlayer diffusion medium 1 disposed in the lower layer. It doesn't matter.
Further, when the end surface of the interlayer diffusion medium 1 protrudes from the end surface of the reinforcing fiber layer 8, it protrudes from all the end surfaces of the reinforcing fiber layer 8 even if only the end portion where the matrix resin impregnation is started. Also good.

Specific examples of the present invention will be described below in comparison with comparative examples.
(Example)
A molded product was obtained in the same manner as in the first embodiment shown in FIGS.
Interlayer diffusion medium 1: GreenFlow 75 (polypropylene) manufactured by AIRTECH
Surface diffusion medium 2: GreenFlow 75 (polypropylene) manufactured by AIRTECH
Release cloth 3: BleederLease B (silicon coating film) manufactured by AIRTECH
Iron)
Airtight film 4: AIRTECH WRIGHTLON 5400 (nylon)
Seal material 7: GS-AT-200Y manufactured by AIRTECH
Reinforcing fiber: Unitika Tatesudare R450N (weight per unit area 450g / m ² )
Matrix resin 12: Vinyl ester resin (Neopol 8250, manufactured by Nippon Yupica)
The thickness of the dividing layer 81: 10 mm
Number of divided layers 81: 3
Pressure in the airtight space S during decompression: −0.08 MPa or less Impregnation time: 30 minutes Thermosetting temperature: 70 ° C.
Thermosetting time: 4 hours The molded product obtained under the above conditions had no unimpregnated portion of the matrix resin and was excellent in strength.

(Comparative example)
As shown in FIGS. 9 to 11, when a molded product was produced in the same manner as in the example except that the interlayer diffusion medium 1 was not used, the thickness of the reinforcing fiber layer 8 was 30 minutes after the start of impregnation. Only about 10 mm was impregnated, and an unimpregnated portion 12 was observed.

  From the above examples and comparative examples, the reinforcing fiber layer 8 is divided into a plurality of divided layers 81 in the thickness direction, and when the interlayer diffusion medium 1 is disposed between the divided layers 81, the reinforcing fiber layer 8 Even if the thickness increases, the matrix resin can be rapidly impregnated.

  The manufacturing method of the fiber reinforced resin molded product of this invention can be used for manufacture of a fiber reinforced resin pipe, a boat, etc., for example.

It is a schematic diagram explaining the state before the matrix resin impregnation in 1st Embodiment of the manufacturing method of the fiber reinforced resin molded product concerning this invention. It is a schematic diagram explaining the state in the middle of resin impregnation of the manufacturing method of the fiber reinforced resin molded product of FIG. It is a schematic diagram explaining the state at the time of completion | finish of resin impregnation of the manufacturing method of the fiber reinforced resin molded product of FIG. It is a schematic diagram explaining the state before the matrix resin impregnation in 2nd Embodiment of the manufacturing method of the fiber reinforced resin molded product concerning this invention. It is a schematic diagram explaining the state before the matrix resin impregnation in 3rd Embodiment of the manufacturing method of the fiber reinforced resin molded product concerning this invention. It is a perspective view which shows one example of a resin diffusion medium. It is the sectional view on the AA line of the resin diffusion medium of FIG. It is a perspective view which shows the other example of the resin diffusion medium. It is a schematic diagram explaining the state before resin impregnation of the manufacturing method of a comparative example. It is a schematic diagram explaining the state in the middle of resin impregnation of the manufacturing method of FIG. It is a schematic diagram explaining the state at the time of completion | finish of resin impregnation of the manufacturing method of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Interlayer diffusion medium 2 Surface diffusion medium 3 Release cloth 4 Airtight film 5 Resin supply pipe 6 Air intake pipe 7 Sealing material 8 Reinforcement fiber layer 81 Split layer 9 Mold 10 Gauze 11 Matrix resin 12 Unimpregnated part S Airtight space

Claims (3)

A laminate comprising a reinforcing fiber layer composed of reinforcing fibers along the mold surface of the mold and a resin diffusion medium laid along the surface of the reinforcing fiber layer is covered with an airtight film, and the airtight film and the molded body are molded. The laminated body is accommodated in an airtight space formed between the mold and the inside of the airtight space is depressurized from the atmospheric pressure, and then the matrix resin is supplied into the airtight space from outside the airtight space while maintaining the reduced pressure state. A method for producing a fiber-reinforced resin molded article comprising a step of impregnating the reinforcing fiber layer while diffusing the matrix resin through the resin diffusion medium,
The reinforcing fiber layer is divided into a plurality of divided layers divided in the thickness direction, a resin diffusion medium is sandwiched between the divided layers and the divided layers, and the matrix resin supplied into the airtight space is placed on the surface of the reinforcing fiber layer A method for producing a fiber-reinforced resin molded article, wherein the reinforcing fiber layer is impregnated while being diffused by the resin diffusion medium of the above and the resin diffusion medium between the divided layers.   2. The fiber according to claim 1, wherein at least a part of the resin diffusion medium disposed between the divided layers protrudes from an edge of the reinforcing fiber layer to the outside of the reinforcing fiber layer, and the matrix resin is supplied from the protruding part. Manufacturing method of reinforced resin molded product.   The reinforcing fiber layer is disposed between a matrix resin supply port provided in the airtight space and an air intake port that sucks and exhausts the air in the airtight space to the outside of the airtight space, and the airtight space extends from the air intake port. The manufacturing method of the fiber reinforced resin molded article of Claim 1 or Claim 2 which supplies the said matrix resin from the said supply port, exhausting the inside air and attracting | sucking the said airtight space in a pressure-reduced state.

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