JP2005232224A - Resin film for manufacturing reinforced fiber prepreg, reinforced fiber prepreg and method for manufacturing resin film for manufacturing reinforced fiber prepreg - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin film for manufacturing a small resin basis weight reinforced fiber prepreg which enables rendering the amount of a resin as small as possible without giving rise to portions unimpregnated with the resin, and thereby enables manufacturing a prepreg as thin as possible, a reinforced fiber prepreg using the same, and a method for manufacturing the resin film for manufacturing the reinforced pregreg. <P>SOLUTION: The resin film for manufacturing the reinforced fiber prepreg is obtained by coating a resin on a release film, and has the number of uncoated portions of a discontinuous resin of ≥10/m<SP>2</SP>, and the reinforced fiber prepreg and the method for manufacturing the same resin film are also described. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a release film coated with a resin for producing a reinforced fiber prepreg, which is an intermediate substrate for producing a fiber reinforced composite material (referred to herein as a resin film for producing a reinforced fiber prepreg), particularly a resin. The present invention relates to a reinforcing fiber prepreg manufacturing resin film having a reduced basis weight, a thin reinforcing fiber prepreg manufactured using the reinforcing fiber prepreg manufacturing resin film, and a method of manufacturing the reinforcing fiber prepreg manufacturing resin film.

  When molding a composite material using a reinforcing fiber prepreg, which is an intermediate substrate for producing a fiber-reinforced composite material, for example, a fiber-reinforced composite material suitable for sports applications such as lightweight golf shafts and fishing rods, the reinforcing fiber is usually used. It is used in a form in which a plurality of prepregs are laminated. In this case, it is often required to form the laminated reinforcing fiber prepreg as thin as possible, and for that purpose, it is necessary to form the reinforcing fiber prepreg for one layer as thin as possible, thereby reducing the overall thickness. It becomes possible to make it thinner.

  In addition, as a typical manufacturing method for reinforcing fiber prepregs, a release film coated with resin is carried on a sheet made of reinforcing fibers, and the resin applied to the release film is transferred to the reinforcing fiber sheet side. There is known a method of impregnating a reinforcing fiber sheet. In such a production method, in order to match the above-mentioned target, the reinforcing fiber content of the prepreg is further increased for the purpose of making the reinforcing fiber composite material obtained from the prepreg lighter and stronger. Therefore, various proposals for obtaining a resin film for producing a reinforced prepreg having a low resin basis weight have been made (for example, Patent Document 1). In such a conventional method, basically, the resin is uniformly applied onto the release film, so there is a limit to the reduction in the resin basis weight of the resin film for producing the reinforced fiber prepreg. There is a limit to reducing the thickness of one layer of the reinforcing fiber prepreg produced by using the.

For the purpose of reducing voids and the like, methods such as those shown in FIGS. 7 and 8 have also been proposed (Patent Document 2). In this method, the release film 11 unwound from the release film roll body 11 and guided through the guide roll 13 is coated on the backup roll 14 with a coating roll 15, a metering roll 16, a weir plate 18, and the like. In a method in which the resin 17 is applied to a predetermined thickness via a roll and wound around the roll body 21 as the resin film 1 for manufacturing a reinforcing fiber prepreg, the applied resin has a width w and an interval L as shown in FIG. In this method, a groove is formed along the longitudinal direction by a comb-shaped resin scraping device 60 provided with a plurality of comb portions. However, even in this method, only the groove is formed on the surface of the resin layer, and the resin layer remains formed on the entire surface. Therefore, there is a limit to the reduction of the resin basis weight of the resin film 1 for producing the reinforcing fiber prepreg, Therefore, there is a limit to reducing the thickness of one layer of the reinforcing fiber prepreg manufactured using this resin film.
JP-A-11-254435 JP-A-4-89209

  Accordingly, an object of the present invention is to produce a reinforced prepreg with a small resin basis weight, which can produce a prepreg that is as thin as possible without generating a resin non-impregnated portion as a prepreg. It is providing the manufacturing method of the resin film for reinforcing fiber prepreg using the resin film for manufacture, and the reinforcing fiber prepreg using the same.

In order to solve the above-mentioned problems, the resin film for producing reinforced fiber prepreg according to the present invention is a resin film for producing reinforced fiber prepreg in which a resin is applied to a release film, and 10 uncoated portions of discontinuous resin are present. consisting of those wherein there pieces / m ² or more.

  In the resin film for reinforcing fiber prepreg production, it is preferable that the integrated area of the uncoated part is smaller than the area of the coated part. As the size of the uncoated portion, the major axis is preferably less than 5 mm. The planar shape of the uncoated portion is not particularly limited, and for example, a circle or an ellipse can be adopted. In a resin film for manufacturing a reinforced fiber prepreg having such a resin uncoated portion, a resin uncoated portion exists at the stage of the resin film, but by appropriately forming the resin uncoated portion. In the stage of producing a prepreg using the resin film, it is possible to uniformly impregnate the reinforcing fiber sheet, thereby making it possible for the reinforcing fiber prepreg to have no resin uncoated portion. become. And by appropriately forming the resin uncoated part as described above at the resin film stage, it becomes possible to reduce the amount of the applied resin to the minimum necessary, and the reinforcement produced using it The fiber prepreg can be made thin with a low resin basis weight.

As described above, the resin film for producing reinforced fiber prepreg according to the present invention is particularly suitable when it is desired to have a low resin basis weight, and the reinforcing fiber produced by using the low resin basis weight as described above. The prepreg can also be formed thin with a low resin basis weight. The average resin basis weight of the resin film for producing reinforcing fiber prepreg can be 10 g / m ² or less. Here, as a specific example, the average resin basis weight is obtained by cutting a resin film into a rectangle of 0.1 m ² or more with one side being 100 mm or more, preparing this cut out n = 3 or more, and removing the resin from the release film. The resin weight scraped off with a spatula or the like can be obtained by averaging the resin weights measured with a balance.

  As the resin, any resin usually used for the production of reinforcing fiber prepregs can be used, and examples thereof include epoxy resins, unsaturated polyester resins, vinyl ester resins, phenol resins, and cyanate ester resins. In particular, an epoxy resin or a resin composition containing an epoxy resin as a main component can be used.

  Further, as the release film, a plastic film or the like can be used, but it is particularly preferable that the release film is made of release paper having good release properties.

The reinforcing fiber prepreg according to the present invention is a reinforcing fiber prepreg in which a sheet made of reinforcing fibers is impregnated with a resin, and is formed by impregnating a resin transferred from the resin film for manufacturing the reinforcing fiber prepreg as described above. Consists of features.
As the reinforcing fiber, any reinforcing fiber that is normally used for reinforcing fiber prepregs can be used. For example, carbon fiber, glass fiber, aramid fiber, boron fiber, alumina fiber, silicon carbide fiber, etc. are used. . Two or more of these fibers may be mixed. Among these, carbon fiber is useful because it is light and has high strength. Carbon fibers include polyacrylonitrile-based and pitch-based ones, and any of them may be used, and graphite fibers may also be included. In addition, the carbon fiber bundle in the present invention is not particularly limited in the number of filaments per single fiber bundle (the number of single fibers), but is preferably 1000 to 72000, more preferably 1000 to 48000, and 3000 to 48000. More preferred are books.

In this reinforced fiber prepreg, the average resin basis weight can be a low resin basis weight of 20 g / m ² or less. Here, the resin basis weight of the reinforcing fiber prepreg is obtained by drawing the reinforcing fiber basis weight obtained by removing the resin from the reinforcing fiber prepreg with a solvent capable of dissolving the resin from the reinforcing fiber prepreg basis weight. As a specific example, a reinforcing fiber prepreg is cut out into a rectangle of 0.1 m ² or more with one side being 100 mm or more, and this cut out is prepared with n = 3 or more, which is a solvent capable of dissolving the resin. Washing, collecting only the reinforcing fiber, obtaining the dry weight of this, obtaining the difference between the weight of the reinforcing fiber prepreg cut out first and the weight of the reinforcing fiber, and dividing each difference by the area of the sample cut out It can be obtained by averaging the resin basis weight.

  The above-described resin film for producing a reinforcing fiber prepreg can be produced by the following method. That is, the method for producing a resin film for producing a reinforced fiber prepreg according to the present invention is a method for producing a resin film for producing a reinforced fiber prepreg in which a molten resin is applied on a release film, and the resin is once applied uniformly. Thereafter, the method comprises scraping the resin discontinuously from the resin film by the resin scraping means.

In this method, it is preferable to scrape off the resin so that the number of non-applied portions of the discontinuous resin is 10 / m ² or more. As the resin scraping means, for example, a roll having a plurality of protrusions can be used.

Further, the method for producing a resin film for producing a reinforced fiber prepreg according to the present invention is a method for producing a resin film for producing a reinforced fiber prepreg in which a molten resin is applied on a release film. After coating on the film having, the resin is transferred from the film onto the release film. In this method, it is preferable to transfer the resin onto the release film so that the number of discontinuous uncoated portions of the resin is 10 / m ² or more.

  According to the present invention, it is possible to obtain a resin film for producing a reinforced prepreg having a low resin basis weight in which an unapplied portion of an appropriately discontinuous resin is formed, and using this, the necessary minimum amount or an amount close thereto is used. It is possible to obtain a thin reinforcing fiber prepreg with a low resin basis weight in which the above resin is uniformly impregnated. Therefore, it is possible to provide a reinforcing fiber prepreg suitable for molding a composite material requiring such a low resin basis weight.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a method for producing a resin film for producing reinforced fiber prepreg according to an embodiment of the present invention. The release film 12 unwound from the roll body 11 of the release film is sent to the backup roll 14 through the guide roll 13 made of a free roll, and the resin 17 on the surface of the coating roll 15 is transferred and applied. The The resin 17 is supplied on the surface of the coating roll 15 at a predetermined thickness while being measured by the clearance between the metering roll 16 and the coating roll 15 and the speed M of the metalling roll 16 and the speed of the coating roll 15. The surplus resin after the transfer is scraped off the surface of 15 by the weir plate 18. In the present embodiment, the resin film 1 in which the resin 17 is applied on the release film 12 is wound up as a roll body 21 of the resin film.

In such a process, in this embodiment, the resin film 1 to which the resin 17 is applied is a resin scraping means comprising a roll having a plurality of protrusions 19a on the surface as shown in FIG. 19, the resin applied to the surface is scraped off by niping with a predetermined pressure between the receiving roll 20 made of a free roll, particularly with the plurality of protrusions 19a. As shown in FIG. 3, the portion where the resin has been scraped forms a discontinuous resin non-coated portion 4 with respect to the resin-coated portion 3 on the release film 2. The resin-uncoated portion 4 is formed at a density of 10 pieces / m ² or more. However, it is preferable that the integrated area of the resin non-application part 4 is smaller than the area of the application part. The major axis or diameter of each non-resin-applied portion 4 is preferably less than 5 mm.

  FIG. 4 shows a method for producing a resin film for producing reinforcing fiber prepreg according to another embodiment of the present invention. In the present embodiment, the resin 17 that is measured by the metering roll 16 and supplied onto the surface of the coating roll 15 with a predetermined thickness is once a resin as a film having a plurality of openings 22a as shown in FIG. After being applied onto the transfer belt 22, it is transferred onto the release film 12 via an upper press roll 24 and a lower press roll 25. Since the resin transfer belt 22 is a perforated film, no resin is applied to the portion of the opening 22a, and therefore, it is not transferred onto the release film 12, and this portion is discontinuous on the release film 12. A resin uncoated portion is formed. The number, shape, and size of the resin-uncoated portion may be the same as described above. The release film 12 is conveyed through the introduction roll 23 and the direction changing roll 26, and the resin transfer belt 22 is circulated between the backup roll 14 and the drive roll 27.

  FIG. 6 shows a method of manufacturing a reinforcing fiber prepreg using the reinforcing fiber prepreg manufacturing resin film manufactured as described above. The reinforcing fiber bundle 32 drawn out from the package 31 of the plurality of reinforcing fiber bundles is a reinforcing fiber in which the plurality of reinforcing fiber bundles 32 are arranged in a sheet shape in parallel with each other through the alignment rolls 33 and 34 and the comb 35. It is in the form of a sheet 36. With respect to the reinforcing fiber sheet 36, an upper release film 40 (for example, a release film made of release paper) drawn from the upper release film roll body 37 is provided through the introduction rolls 38 and 39. The lower release film 44 drawn out from the lower release film roll body 41 is arranged on the lower surface side of the reinforcing fiber sheet 36 through the introduction rolls 42 and 43. The As described above, the resin is applied and supported on at least one of the upper and lower release films 40 and 44. In this embodiment, the resin is applied and supported on at least the upper release film 40. However, a resin may be applied and supported on both release films 40 and 44.

  Thus, the reinforcing fiber sheet 36 sandwiched between the release films 40 and 44 from both sides is heated by the heater 45 and the resin applied to the release film is heated and softened, and is nipped by the impregnating rolls 46 and 47. By being pressurized, the resin is impregnated into the reinforcing fiber sheet 36. The reinforcing fiber sheet 36 impregnated with the resin is wound up and collected as the roll body 53 at the position of the take-up rolls 48 and 49, and the upper release film 50 after the resin is transferred to the reinforcing fiber sheet 36 side. . The reinforcing fiber sheet 36 impregnated with the resin is wound up as a roll body 52 as the reinforcing fiber prepreg 51. In this embodiment, the lower release film 44 is also wound together with the reinforcing fiber prepreg 51, and functions as a release material when the reinforcing fiber prepreg 51 is unwound and used for molding a composite material.

The result of manufacturing the resin film for manufacturing reinforcing fiber prepreg and the reinforcing fiber prepreg using the apparatus as described above will be described.
Example 1
As the coating apparatus, the reverse roll coater provided with the resin scraping apparatus shown in FIG. 1 was used. For the resin scraping device, a resin scraping roll having protrusions shown in FIG. 2 was used. The protrusion 19a has a hemispherical shape with a diameter of 2 mm and a height of 2 mm, and the protrusion occupation area is 40% in the resin scraping roll.

The resin to be applied was prepared in advance with the following composition, and a resin composition having a minimum viscosity of 50 poise and a minimum temperature viscosity of 120 ° C. was used.
The resin composition is as follows.
Bisphenol A type epoxy resin: 20 parts by weight (Epicoat 828, registered trademark, manufactured by Japan Epoxy Resins Co., Ltd.)
Bisphenol A type epoxy resin: 30 parts by weight (Epicoat 1001, registered trademark, manufactured by Japan Epoxy Resins Co., Ltd.)
Phenol novolac type epoxy resin: 50 parts by weight (Epicoat 154, registered trademark, manufactured by Japan Epoxy Resins Co., Ltd.)
Polyvinyl formal: 10 parts by weight (Vinylec K, trade name, manufactured by Chisso Corporation)
3- (3,4-dichlorophenyl) -1,1-dimethylurea: 10 parts by weight (DCMU99, model number, manufactured by Hodogaya Chemical Co., Ltd.)
As the release film, a carbon fiber prepreg peeling process paper (WBE90R-DT, trade name, manufactured by Lintec Corporation) having a width of 1080 mm was used.

The resin is heated so that the resin temperature at the time of application is 75 ° C., and the clearance between the metering roll 16 and the coating roll 15 is set to 22 μm on the release film 12 so that the resin basis weight is 20 g / m ^2. Combined and applied to a width of 1000 mm. At this time, the resin scraping roll was reversely rotated at the same speed with respect to the coating speed (release paper speed) to scrape the resin from the release film.

The obtained resin film had a major axis of 3.8 mm, and a discontinuous resin-uncoated portion, which was 43% of the total area, was formed at 100 or more / 100 mm ² . The average basis weight of this resin film was 12.2 g / m ² .

A reinforcing fiber prepreg was produced using the two resin films using the apparatus shown in FIG. As the reinforcing fibers, 95 carbon fiber bundles (fineness: 0.8 g / m) having an average single fiber diameter of 7 μm, the number of single fibers of 12,000, a tensile strength of 4.9 GPa, and a tensile modulus of 230 GPa were used. The carbon fiber sheet in which these carbon fiber bundles are aligned is sandwiched between the two resin films from above and below, the heater 45 and the impregnating rolls 46 and 47 are heated to 130 ° C., the speed is 7 m / min, and the linear pressure is 4 kg / A carbon fiber prepreg was obtained by impregnating the carbon fiber bundle with a resin under pressure at cm. The carbon fiber prepreg had a prepreg basis weight of 100.2 g / m ² , a fiber basis weight of 76.1 g / m ² , and a fiber content of 75.9%. There were no resin-impregnated portions on the prepreg surface.

Example 2
Using the same resin as in Example 1, a resin film was produced with the apparatus shown in FIG. At this time, as the film 22 shown in FIG. 5, a film having an aperture ratio of 45% having a circular hole 22 a having a diameter of 2 mm was used. The same release paper as in Example 1 was used as the release film 12 to which the resin was transferred and applied from the film 22. The speed of the release film 12 during transfer was the same as the traveling speed of the film 22. The linear pressure of the press rolls 24 and 25 at the time of transfer was 0.2 kg / cm. The resin was heated so that the resin temperature at the time of application to the film 22 was 75 ° C., and the clearance between the metalling roll 16 and the coating roll 15 was adjusted to 22 μm on the film 22 and applied to a width of 1000 mm.

As a result, a resin film having a major axis of 3 mm and having discontinuous resin non-coated portions forming 45% of the total area at 100/100 mm ² was obtained. The average basis weight of this resin film was 11.9 g / m ² .

A carbon fiber prepreg was obtained in the same manner as in Example 1 using the obtained resin film. The carbon fiber prepreg had a prepreg basis weight of 100.3 g / m ² , a fiber basis weight of 76.0 g / m ² , and a fiber content of 75.8%. There were no resin-impregnated portions on the prepreg surface.

Example 3
A resin film was produced in the same manner as in Example 2 except that the clearance between the metering roll 16 and the coating roll 15 was set to 12 μm. As a result, a resin film having a major axis of 3 mm and having discontinuous resin non-coated portions forming 45% of the total area at 100/100 mm ² was obtained. The average basis weight of this resin film was 5.1 g / m ² . Using the obtained two resin films and 50 carbon fibers of Example 1, a carbon fiber prepreg was obtained in the same manner as in Example 1. Prepreg basis weight of the carbon fiber prepreg 50.1 g / m ^2, the fiber basis weight 39.9 g / m ^2, the fiber content was 79.5%. There were no resin-impregnated portions on the prepreg surface.

Comparative Example 1
Using the same resin as in Example 1, a resin film was produced using the apparatus shown in FIG. At this time, the resin scraping apparatus in FIG. 8 used a comb having a width w of 0.3 mm and an interval of L2 mm in FIG. The resin was heated so that the resin temperature at the time of application was 75 ° C., and the clearance between the metalling roll 16 and the coating roll 15 was adjusted to 15 μm on the release film 12 and applied to a width of 1000 mm. In the obtained resin film, continuous uncoated grooves having a width of 0.25 mm and a distance of 2.2 mm were formed. The average basis weight of this resin film was 12.3 g / m ² . Using this two resin films, a carbon fiber prepreg was obtained in the same manner as in Example 1. The carbon fiber prepreg had a prepreg basis weight of 100.3 g / m ² , a fiber basis weight of 76.2 g / m ² , and a fiber content of 76.0%. A streak occurred, resulting in a defective product.

Comparative Example 2
As the film 22 of FIG. 5, a film with an opening ratio of 25% having 8 circular holes 22a with a diameter of 100 mm / m ² was used. The same release paper as in Example 1 was used as the release film 12 to which the resin was transferred and applied from the film 22. The speed of the release film 12 during transfer was the same as the traveling speed of the film 22. The linear pressure of the press rolls 24 and 25 at the time of transfer was 0.2 kg / cm. The resin was heated so that the resin temperature at the time of application to the film 22 was 75 ° C., the metalling roll 16 / coating roll 15 clearance was adjusted to 18 μm, and the film 22 was applied to a width of 1000 mm.

As a result, a resin film having a major axis of 10 mm and having a discontinuous resin non-coated portion which is 25% of the total area was obtained at 8 pieces / 1 m ² . The average basis weight of this resin film was 12.3 g / m ² . A carbon fiber prepreg was obtained in the same manner as in Example 1 using the obtained resin film. The carbon fiber prepreg had a prepreg basis weight of 100.4 g / m ² , a fiber basis weight of 76.1 g / m ² , and a fiber content of 75.9%. On the surface of the prepreg, a large resin non-impregnated portion having a diameter of 100 mm was formed, resulting in a defective product.

  The present invention can be applied not only to sports and leisure applications such as golf shafts and fishing rods but also to general industrial applications such as aircraft applications and civil engineering construction, but the application range is not limited to these. Absent.

It is a schematic side view of the apparatus for enforcing the manufacturing method of the resin film for reinforced fiber prepreg manufacture which concerns on one embodiment of this invention. It is an expansion perspective view which shows the example of the resin scraping means of the apparatus of FIG. It is a schematic partial top view of the resin film from which resin was scraped off by the resin scraping means of FIG. It is a schematic side view of the apparatus for enforcing the manufacturing method of the resin film for reinforcement fiber prepreg manufacture concerning another embodiment of the present invention. FIG. 5 is a schematic partial plan view of a resin transfer belt of the apparatus of FIG. 4. It is a schematic side view of the apparatus for manufacturing the reinforced fiber prepreg which concerns on one embodiment of this invention. It is a schematic side view of the manufacturing apparatus of the conventional resin film for reinforcing fiber prepreg manufacture. It is a schematic front view of the comb-shaped resin scraping apparatus in the apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin film 2 Release film 3 Resin application part 4 Resin non-application part 11 Release film roll body 12 Release film 13 Guide roll 14 Backup roll 15 Coating roll 16 Metalling roll 17 Resin 18 Dam plate 19 Resin scraping means 19a Projection body 20 Receiving roll 21 Roll body of resin film 22 Resin transfer belt 22a Belt opening 23 Introduction roll 24 Press upper roll 25 Press lower roll 26 Direction change roll 27 Driving roll 31 Reinforcing fiber bundle package 32 Reinforcing fiber bundle 33, 34 Alignment Roll 35 Comb 36 Reinforced Fiber Sheet 37 Upper Release Film Roll 38, 39 Introduction Roll 40 Upper Release Film 41 Lower Release Film Roll 42, 43 Introduction Roll 44 Lower Release Mold fill 45 Heater 46, 47 Impregnation roll 48, 49 Take-up roll 50 Upper release film 51 Reinforced fiber prepreg 52 Reinforced fiber prepreg roll body 53 Upper release film roll body

Claims (13)

Reinforcing fiber prepreg for producing a resin film, characterized in that the release film in the reinforcing fiber prepreg manufacturing the resin film for the resin is formed by coating, uncoated portion of the discontinuous resin is 10 / m ² or more.   The resin film for producing a reinforced fiber prepreg according to claim 1, wherein an integrated area of the uncoated part is smaller than an area of the coated part.   3. The resin film for producing a reinforcing fiber prepreg according to claim 1, wherein a major axis of the uncoated portion is less than 5 mm. The resin film for producing reinforced fiber prepreg according to any one of claims 1 to 3, wherein an average resin basis weight is 10 g / m ² or less.   The resin film for producing a reinforced fiber prepreg according to any one of claims 1 to 4, wherein the resin is made of a resin composition containing an epoxy resin as a main component.   The resin film for producing a reinforcing fiber prepreg according to claim 1, wherein the release film is a release paper.   A reinforcing fiber prepreg in which a sheet made of reinforcing fibers is impregnated with a resin, wherein the resin transferred from the resin film for reinforcing fiber prepreg production according to any one of claims 1 to 6 is impregnated. Reinforcing fiber prepreg. The reinforcing fiber prepreg according to claim 7, wherein an average resin basis weight is 20 g / m ² or less.   In the method for producing a reinforced fiber prepreg resin film in which a molten resin is applied onto a release film, after the resin is applied uniformly, the resin is scraped discontinuously from the resin film by a resin scraping means. The manufacturing method of the resin film for reinforced fiber prepreg manufacture characterized by these. The method for producing a resin film for producing a reinforced fiber prepreg according to claim 9, wherein the resin is scraped off so that the number of unapplied portions of the discontinuous resin becomes 10 pieces / m ² or more.   The method for producing a resin film for producing a reinforcing fiber prepreg according to claim 9 or 10, wherein the resin scraping means is a roll having a plurality of protrusions.   In the method for producing a reinforced fiber prepreg resin film in which a molten resin is applied onto a release film, the resin is once applied on the film having a plurality of openings, and then the resin is applied from the film onto the release film. A method for producing a resin film for producing a reinforced fiber prepreg, which comprises transferring the resin film. 13. The method for producing a resin film for producing a reinforced fiber prepreg according to claim 12, wherein the resin is transferred onto the release film so that the number of non-applied portions of the discontinuous resin is 10 / m ² or more. .

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