JP2005161797A - Manufacturing method and manufacturing apparatus for prepreg - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method and a manufacturing apparatus for a prepreg suitable for fabricating a bundle of thin reinforcing fibers in particular into the prepreg. <P>SOLUTION: The present invention relates to a manufacturing method for the prepreg of impregnating the bundle of a plurality of running reinforcing fibers paralleled in one direction with a resin. The bundle of the reinforcing fibers is supplied to a resin impregnating portion, after the bundle is passed while the bundle is made to come into contact with a roll having a protrusion parallel to the axial direction on the surface in a direction perpendicular to the axial direction, keeping a ratio ¾Vr/Vf¾ of an absolute value of the roll velocity Vr in the circumferential direction to an absolute value of the transferring velocity Vf of the reinforcing fibers in the range of ¾Vr/Vf¾<1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a manufacturing method and a manufacturing apparatus for manufacturing a unidirectional prepreg from a reinforcing fiber bundle.

  As is well known, unidirectional prepregs are used for molding FRP (fiber reinforced plastic). Such a unidirectional prepreg, for example, aligns a plurality of reinforcing fiber bundles such as carbon fiber bundles in parallel in one direction, and opens and widens each reinforcing fiber bundle as necessary to strengthen it. After forming the fiber sheet, a release paper coated with a matrix resin such as a B-stage epoxy resin is superimposed on the reinforcing fiber sheet on the resin application surface, and the matrix resin on the release paper is transferred to and impregnated into the reinforcing fiber sheet. Manufactured by. This is a so-called hot melt method, but if there is variation in the yarn width of the reinforcing fiber bundle at the portion impregnated with the resin, the resulting unidirectional prepreg can be cracked or reinforced even if cracking is not possible. The surface unevenness of the surface becomes large. In that case, of course, the molded FRP has non-uniform characteristics. That is, the presence or absence of yarn width variation in the reinforcing fiber bundle affects the characteristics of the unidirectional prepreg, and thus the characteristics of the FRP.

  In general, when preparing a prepreg, a reinforcing fiber bundle is drawn from a reinforcing fiber bundle bobbin installed in a creel, passed through a guide roll, a comb that aligns the pitch interval of reinforcing fibers, etc., or into a resin-impregnated part, or a spread part. And supplied to the resin-impregnated portion (for example, see Patent Document 1). At that time, in the free zone or the comb between the guide rolls, the reinforcing fiber bundle may be reversed due to the tension fluctuation of the reinforcing fiber bundle or the fluctuation of the yarn swing angle. When the reinforcing fiber bundle is reversed, the yarn width of the reinforcing fiber bundle is partially narrowed at the reversed portion. In particular, in the case of a so-called untwisted flat reinforcing fiber wound up in a tape shape, if the reinforcing fiber bundle that has been inverted is supplied to the impregnation part as it is, the reinforcing fiber bundle is twisted at the inverted part, and the original yarn width is reduced. In some cases, the prepreg produced may be defective. Further, even when a reinforcing fiber bundle opening device is installed upstream of the resin-impregnated portion, it is needless to say that the reversal portion of the reinforcing fiber bundle is not sufficiently opened and the same defect as described above occurs.

As a method for preventing the reversal of the fiber reinforced bundle, a stepwise creel is installed to reduce the horizontal swing angle to the comb (for example, see Patent Document 1) or a roller that rotates at a lower speed than the reinforced fiber bundle. There is a method of using an anti-inversion device made of Of these, the method of installing the step-like creel has some effect in preventing twisting at the comb portion, but the width direction of the reinforcing fiber bundle is rotated by 90 ° with respect to the width direction of the prepreg to be produced by the comb. The resin-impregnated part is horizontal with respect to the width direction of the prepreg to be produced, and therefore the reinforcing fiber bundle needs to be rotated at least 90 ° between the comb and the resin-impregnated part, so that twisting is likely to occur. Nevertheless, the twist that occurs here cannot be resolved. Also, in the method of using a reversal prevention device comprising a roller that rotates at a lower speed than the reinforcing fiber bundle, when applied to a reinforcing fiber bundle having 12,000 filaments or more and a yarn width of 6 mm or more, reversal is prevented to some extent. However, when applied to a narrow yarn having a filament number of about 3,000 to 12,000 and a yarn width of about 2 to 6 mm, the reversal part gets over the roller because the yarn width is thin. In some cases, sufficient effects cannot be obtained.
JP 2002-020033 A (all pages) JP 11-156852 A (all pages)

  An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a prepreg manufacturing method and a manufacturing apparatus suitable particularly when processing a prepreg using a narrow reinforcing fiber bundle. .

  In order to solve the above-described problems, the present invention provides a method for manufacturing a prepreg in which a plurality of reinforcing fiber bundles that are aligned and run parallel to one direction are impregnated with a resin, in the axial direction on the upstream side of the resin-impregnated portion. The ratio of the absolute value of the peripheral speed Vr of the roll and the conveying speed Vf of the reinforcing fiber | Vr / Vf | is in the range of | Vr / Vf | <1. This is a method for producing a prepreg that is supplied to a resin-impregnated portion after passing through a reinforcing fiber bundle while being in contact with each other in a direction perpendicular to the axial direction.

  Furthermore, in order to solve the said subject, this invention has the following structure. That is, the rotation direction of the roll that vibrates in the axial direction and has protrusions parallel to the axial direction on the surface is the same as the conveyance direction of the reinforcing fiber bundle, and the protrusion that vibrates in the axial direction and parallel to the axial direction The roll has an amplitude of 0.5 to 20 mm, vibrates in the axial direction, and a roll having a protrusion parallel to the axial direction on the surface has a frequency of 0.5 to 30 Hz.

  Furthermore, in order to solve the above-described problems, the present invention provides a guide portion that guides the reinforcing fiber bundle, an aligning portion that aligns the reinforcing fiber bundle conveyed through the guide portion at a predetermined interval, and the aligning portion. In a prepreg manufacturing apparatus comprising an impregnation portion for impregnating a resin into a bundle of reinforcing fibers aligned by a surface, a projection that vibrates in the roll axis direction and is parallel to the roll axis direction between the alignment portion and the impregnation portion. Is a prepreg manufacturing apparatus provided with at least one drive roll.

  The present invention relates to a method for manufacturing a prepreg in which a plurality of reinforcing fiber bundles that are aligned and run parallel to one direction are impregnated with resin, and vibrates in the axial direction upstream of the resin-impregnated portion and parallel to the axial direction. The rolls having various protrusions on the surface, the ratio of absolute values of the roll peripheral speed Vr and the reinforcing fiber transport speed Vf, | Vr / Vf |, is in the range of | Vr / Vf | <1, It is a manufacturing method of a prepreg that is supplied to a resin-impregnated part after passing while contacting in a direction perpendicular to the axial direction, and prevents twisting and inversion of the reinforcing fiber bundle from being brought into the resin-impregnated part. A prepreg can be produced while suppressing the occurrence of poor smoothness sites.

  Next, the present invention will be described in more detail.

  In a general prepreg manufacturing method, the reinforcing fiber bundle is sent to the resin impregnated part after being aligned in one direction via the guide part and the aligning part. When passing, the reinforcing fiber bundle may be twisted or inverted. In the present invention, the reinforcing fiber bundle is perpendicular to the axial direction on a driving roll having a projection on the surface that vibrates in the axial direction and is parallel to the axial direction after the alignment portion that aligns the reinforcing fiber bundle in one direction. By bringing them into contact with each other in the direction, the reinforcing fiber bundle maintains a certain shape on the roll, so that twisting and reversal are dammed before the roll. As a result, a suitable prepreg can be obtained without twisting or reversing exceeding the roll and being supplied to the resin-impregnated portion.

  Here, the ratio | Vr / Vf | of the absolute value of the peripheral speed Vr of the driving roll that vibrates in the axial direction and has protrusions parallel to the axial direction on the surface and the conveying speed Vf of the reinforcing fiber is | Vr / Vf | It is important that it is within the range of <1. If it is in the range other than that, twist or inversion exceeds the driving roll and is supplied to the resin impregnated part, or vibrates in the axial direction, and in the axial direction. The reinforced fiber bundle may be damaged by rubbing between the driving roll having parallel protrusions on the surface and the reinforcing fiber bundle, leading to deterioration in quality when a prepreg is obtained. Note that the ratio | Vr / Vf | of the absolute value of the circumferential speed Vr of the driving roll that vibrates in the axial direction and has protrusions parallel to the axial direction on the surface and the conveying speed Vf of the reinforcing fiber bundle is 0.05 ≦ | More preferably, Vr / Vf | ≦ 0.5, and even more preferably 0.05 ≦ | Vr / Vf | ≦ 0.4. Within such a range, it is possible to more effectively prevent the twisted or inverted supply to the impregnated portion.

  Further, by making the drive roll that vibrates in the axial direction and has protrusions parallel to the axial direction on the surface thereof, the direction of the reinforcing fiber bundle by rubbing between the drive roll and the reinforcing fiber bundle becomes the same. Damage can be suppressed.

  Furthermore, the amplitude and frequency of the driving roll that vibrates in the axial direction and has protrusions parallel to the axial direction on the surface are appropriately selected depending on the reinforcing fiber bundle to be used, and are not particularly specified. If it is about 20 mm and the frequency is about 0.5 to 30 Hz, the reinforcing fiber bundle is rarely damaged, which is preferable. Furthermore, it is more preferable if the amplitude is about 1 to 15 mm and the frequency is about 3 to 20 Hz.

  In the above, the reinforcing fiber bundle is, for example, a carbon fiber bundle, a glass fiber bundle, or an aramid fiber bundle. Among them, the present invention is suitable when a carbon fiber bundle having a relatively high elastic modulus and easily causing single fiber breakage or fluff is used. Examples of the carbon fiber bundle include polyacrylonitrile fiber and pitch fiber. The material is preferably made of raw material fibers.

  In the present invention, the number of filaments of the reinforcing fiber bundle can be 1,000 to 100,000, and in particular, the number of filaments is about 3,000 to 12,000 and the yarn width is about 2 to 6 mm. In the case of using a carbon fiber bundle, the effect that the drive roll vibrates in the axial direction is remarkable, which is preferable.

  If the traveling speed Vf of the reinforcing fiber bundle is too slow, the efficiency of prepreg production is deteriorated, and if it is too fast, the apparatus for impregnating the resin becomes large, and is preferably about 3 to 20 m / min. It is more preferable if it is about 15 m / min.

  Further, the tension of the reinforcing fiber bundle when supplying the roll having protrusions parallel to the axial direction on the surface is not particularly limited, but is preferably 0.05 to 0.82 N per 1,000 filaments. 0.08 to 0.65N is more preferable. When the tension is less than 0.05N per 1,000 fibers, the running performance of the reinforcing fiber bundle may be deteriorated and the processability may be deteriorated. When the tension exceeds 0.82N per 1,000 fibers, the guide When the reinforcing fiber bundle is abraded with the like, the reinforcing fiber bundle may be easily fuzzed. Further, the reinforcing fiber bundle that vibrates in the axial direction and that is supplied to the roll having protrusions parallel to the axial direction on the surface thereof is a temperature at which the sizing agent that is attached to the reinforcing fiber bundle in advance with a heater or the like is softened. If heated to about 180 ° C., the convergence of the reinforcing fiber bundle is moderately removed, and the running properties of the reinforcing fiber on a roll that vibrates in the axial direction and has protrusions parallel to the axial direction on the surface. It is preferable because it is stable, and 70 to 130 ° C. is more preferable. When the temperature is less than 50 ° C., the sizing agent may not be sufficiently softened. When the temperature exceeds 180 ° C., the characteristics of the FRP may be adversely affected due to the weight loss or alteration of the sizing agent itself.

  The prepreg manufacturing apparatus of the present invention includes a guide unit that guides a reinforcing fiber bundle, an alignment unit that aligns the reinforcing fiber bundles conveyed through the guide unit at predetermined intervals, and a reinforcement that is aligned by the alignment unit. In a prepreg manufacturing apparatus comprising an impregnation unit for impregnating a fiber bundle with resin, a driving roll that vibrates in the roll axis direction between the alignment unit and the impregnation unit and has a protrusion parallel to the roll axis direction on the surface. At least one is provided.

  Here, the guide part generally conveys a necessary number of reinforcing fiber bundles fed out from a package such as a bobbin while being guided, but the method is not particularly limited. The guide part may be provided with a roller, a pin or the like for changing the direction of the fed reinforcing fiber bundle.

  Further, in order to align the reinforcing fiber bundles in parallel, the alignment portion generally uses combs with pins arranged at equal pitch intervals or rolls having grooves between equal pitches. The means is not particularly limited.

  Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings.

  FIG. 1 shows a prepreg manufacturing apparatus according to an embodiment of the present invention, in which a guide portion 3 for guiding reinforcing fiber bundles 2, 2,..., And a reinforcement conveyed through the guide portion 3. The comb 4 is an alignment portion that aligns the fiber bundles at a predetermined interval, and the impregnation portion 8 that impregnates the reinforcing fiber bundles aligned by the alignment portion with resin. Here, the guide portion 3 has guide rolls 31 and 32.

  The multiple reinforcing fiber bundles 2, 2,... Fed out from the multiple packages 1, 1,... Are parallel to each other in one direction via the freely rotating guide rolls 31 and 32 and the comb 4. The sheet is fed into a sheet shape, vibrated in the axial direction, and sent to a driving roll 6 having protrusions parallel to the axial direction on the surface.

  The reinforcing fiber bundles 2, 2,... Are preheated by the heater 5 before entering the roll 6. The heating means and the heating temperature are not particularly defined, but a heater is preferable because a wide range can be heated relatively easily. The heating temperature is 50 to 180 ° C. at which the sizing agent adhering to the reinforcing fiber bundle is softened. preferable. The roll 6 has, for example, the shape shown in FIG.

  Here, by setting the protrusion height t of the roll 6 to a height exceeding r {[1 / cos (θ / 2)]-1} with respect to the roll radius r, the reinforcing fiber bundle is not brought into contact with the roller surface. Thus, damage to the yarn can be prevented. Note that the protrusion height t of the drive roll need not be higher than necessary, and is preferably less than 10r {[1 / cos (θ / 2)]-1} because roll processing is easy.

  Further, the angle θ between the adjacent protrusions and the roll axis is preferably 5 to 50 °, more preferably 10 to 45 °. If θ is less than 5 °, the pitch of the protrusions may be too narrow and the force to stop twisting may be weakened. If it exceeds 50 °, the curvature of the protrusions will increase and the single fiber of the reinforcing fiber bundle Cutting and fluffing may occur. Here, the drive roll is made of hard chrome plating, ceramics, polyfluorinated ethylene-treated metal or the like, and the radius r is preferably about 20 to 100 mm, more preferably 25 to 80 mm. When the radius r is less than 20 mm, the roll may be deformed due to the tension of the reinforcing fiber bundle. When the radius r exceeds 100 mm, the size of the equipment increases and the effect of preventing twisting may decrease. is there. The surface roughness of the drive roll is preferably a 3-20S satin surface, and more preferably 6-16S. When the surface roughness is less than 3S, the contact area of the reinforcing fiber bundle with the roller increases. For example, when dirt such as a sizing agent of the reinforcing fiber bundle adheres to the roll, the single fiber of the reinforcing fiber bundle is easily wound. On the other hand, if the surface roughness exceeds 20S, the reinforcing fiber bundle is likely to be damaged due to the irregularities on the surface of the roll, which tends to lead to yarn breakage or yarn damage.

  The roll 6 is driven and controlled by a motor and a transmission. Further, the method for imparting vibration to the roll 6 is not particularly limited, but a vibration motor, a crank mechanism, or the like can be used.

  Further, the roll 6 vibrates in the axial direction and rotates in the same direction as the reinforcing fiber bundle, and the ratio | Vr / Vf | of the absolute value of the peripheral speed Vr and the reinforcing fiber transport speed Vf is set to | Vr / Vf | <1. Within the range.

  The reinforcing fiber bundles 2, 2,... That have vibrated in the axial direction and passed through the driving roll 6 having protrusions parallel to the axial direction on the surface are sent to the resin-impregnated portion 8 through the guide roll 7. In the resin-impregnated portion 8, the upper and lower surfaces of the reinforcing fiber bundles 2, 2,... Are separated by applying a matrix resin such as B-stage epoxy resin or unsaturated polyester resin introduced through the introduction rolls 81, 81. The pattern papers 9, 9 are overlapped so that their resin-coated surfaces face the reinforcing fiber bundles 2, 2,..., Preheated by the heater 82, and then passed between heated impregnating rolls 83, 83 to release the release paper 9 , 9 is transferred and impregnated into the reinforcing fiber bundles 2, 2,... That is, it is set as a unidirectional prepreg. After the transfer and impregnation of the matrix resin, the upper release paper 10 is peeled off through the take-up rolls 84 and 84, and the lower release paper 10 is taken up into a roll shape to obtain a roll body 11 of a unidirectional prepreg.

  Further, as shown in FIG. 4, the fiber opening means 12 may be provided on the downstream side of the drive roll 6 and the guide roll 7 that vibrate in the axial direction and have protrusions parallel to the axial direction on the surface. There are no particular restrictions on the opening means, and known techniques are used as appropriate. For example, as described in JP-A 03-146735, three bars are passed through in tension, and the reinforcing fiber bundle is passed through. A means for expanding and a means described in Japanese Patent Laid-Open No. 10-292238 can be used for passing and opening a plurality of roller groups while bending them at a predetermined angle.

(Example 1)
Using the apparatus shown in FIG. 1, as the reinforcing fiber bundles 2, 2,..., Carbon having an average single fiber diameter of 7 μm, the number of single fibers of 12,000, a fineness of 0.8 kg / m, and a yarn width of 6 mm on the package. Using a fiber bundle (Toray Industries, Inc. “Torayca” T700SC-12K), 188 of them were aligned in a comb 4 so as to be parallel in one direction at a pitch of 5.3 mm, and axially at a speed of 8 m / min. The roll 6 which vibrates and has a protrusion parallel to the axial direction on the surface was supplied. The tension per 1,000 single fibers at the time of supply was set to 0.26N.

  The roll 6 that vibrates in the axial direction and has protrusions parallel to the axial direction on the surface has a diameter of 50 mm, a protrusion height of 5 mm, and a protrusion tip having a radius of 2 mm. The angle formed between the adjacent protrusions and the roll axis (θ ) Was set to 45 °, and a hard chrome plating roll processed on a satin surface having a surface roughness of 10S was used. It was vibrated in the axial direction with an amplitude of 10 mm and a frequency of 3 Hz.

  Furthermore, the roll 6 was rotated in the same direction as the reinforcing fiber bundle at a peripheral speed of 2 m / min, and the ratio | Vr / Vf | of the peripheral speed Vr of the roll 6 and the conveying speed Vf of the reinforcing fiber bundle was set to 0.25.

  Note that an infrared heater was used as the heater 5, and the heater 5 was heated so that the carbon fiber bundle became 77 ° C. This temperature of 77 ° C. is the softening point temperature of the sizing agent adhered to the carbon fiber bundle.

  The reinforcing fiber bundle that passed through the roll 6 was not twisted or reversed, and was sent to the resin-impregnated portion 8 through the guide roll 7.

In the resin impregnated portion 8, as the release papers 9, 9, a B-stage epoxy resin coated on one side with a width of 1,005 mm and a basis weight of 37 g / m ² was used. The heating temperature by the heater was 120 ° C., and the linear pressure of the impregnating roll was 1,000 kg / 1,000 mm width. The obtained prepreg had a width of 1000 mm, a basis weight of 150 g / m ² and a fiber weight content of 67%, and the prepreg had no defects such as cracks and defective smoothness.
(Example 2)
A prepreg is produced under the same conditions as in Example 1 except that the roll 6 that vibrates in the axial direction and has protrusions parallel to the axial direction on the surface is rotated in the direction opposite to the reinforcing fiber bundle at a peripheral speed of 2 m / min. did.

The reinforcing fiber bundle that passed through the roll 6 was not twisted or reversed, and was sent to the resin impregnated portion 8 through the guide roll 7, but the reinforcing fiber bundle was slightly damaged by contact with the roll. The obtained prepreg was not problematic as a prepreg product although a small amount of keratin defects due to the damage of the reinforcing fiber bundle was observed.
(Example 3)
94 carbon fiber bundles similar to those in Example 1 are aligned so as to be aligned in one direction at a pitch of 10.6 mm, and supplied to the apparatus shown in FIG. 4 at a speed of 6 m / min. A prepreg was produced under the same conditions as in Example 1 except that the basis weight of the applied epoxy resin was 22 g / m ² . The ratio | Vr / Vf | of the peripheral speed Vr of the roll 6 that vibrates in the axial direction and has protrusions parallel to the axial direction on the surface and the conveying speed Vf of the reinforcing fiber bundle is 0.33, As the means 12, a means described in Example 1 of Japanese Patent Laid-Open No. 10-292238, which is opened by passing through a plurality of roller groups while being bent at a predetermined angle, was used.

The reinforcing fiber bundle that passed through the roll 6 was not twisted or reversed, and was sent to the resin impregnated portion 8 through the guide roll 7 and the fiber opening means 12. The obtained prepreg had a width of 1000 mm, a basis weight of 119 g / m ² and a fiber weight content of 63%, and the prepreg had no defects such as cracks and defective smoothness.
Example 4
Similar to Example 1, except that the peripheral speed Vr of the roll 6 is rotated in the same direction as the reinforcing fiber bundle at 5 m / min, and the ratio | Vr / Vf | with respect to the conveying speed Vf of the reinforcing fiber bundle is set to 0.63. A prepreg was prepared.

The reinforcing fiber bundle that passed through the roll 6 was slightly twisted. However, the obtained prepreg had no defects such as cracks and poor smoothness.
(Comparative Example 1)
A prepreg was produced in the same manner as in Example 1 except that the roll 6 was not installed.

The reinforcing fiber bundle sent to the resin-impregnated portion 8 through the guide roll 7 includes twisting and reversal, and the obtained prepreg has crack defects at the twisting and reversing portion of the reinforcing fiber bundle, and many smooth defective portions occur. The quality of the prepreg was inferior.
(Comparative Example 2)
The ratio of the circumferential speed Vr of the roll 6 that vibrates in the axial direction and has protrusions parallel to the axial direction to the same direction as the reinforcing fiber bundle at a speed of 9 m / min. A prepreg was produced in the same manner as in Example 1 except that Vr / Vf | was changed to 1.13.

The reinforcing fiber bundle sent to the resin-impregnated portion 8 through the guide roll 7 includes twisting and reversing, and the obtained prepreg has crack defects at the twisting and reversing portion of the reinforcing fiber bundle, and many smooth defective portions occur. The quality of the prepreg was inferior.
(Comparative Example 3)
A ratio of the circumferential speed Vr of the roll 6 that vibrates in the axial direction and has protrusions parallel to the axial direction to the same direction as the reinforcing fiber bundle at a speed of 10 m / min. A prepreg was produced in the same manner as in Example 2 except that Vr / Vf | was changed to 1.25.

The reinforcing fiber bundle that passed through the roll 6 was not twisted or reversed, and was sent to the resin impregnated portion 8 through the guide roll 7, but the damage of the reinforcing fiber bundle was noticeable due to contact with the roll. . The obtained prepreg was inferior in quality as a prepreg because of frequent defects due to damage of the reinforcing fiber bundle.
(Comparative Example 4)
In Example 3, instead of the roll 6, an isomorphous roll that is free of vibration and rotates freely was installed. Otherwise, a prepreg was produced in the same manner as in Example 2.

  The reinforcing fiber bundle sent to the opening means 12 through the guide roll 7 includes twisting and reversing, and the reinforcing fiber bundle that is widened by the opening means 12 and sent to the resin-impregnated portion 8 is also locally twisted and reversed at the yarn width. It was narrow. The obtained prepreg was inferior in quality as a prepreg due to frequent cracking defects at narrow portions due to twisting and reversal of the reinforcing fiber bundle.

It is a schematic side view of the manufacturing apparatus of the prepreg which concerns on one form of this invention. It is a schematic side view of the roll 6 which vibrates to the axial direction which concerns on one form of this invention, and has a processus | protrusion parallel to an axial direction on the surface. It is a whole view of the roll 6 which vibrates to the axial direction which concerns on one form of this invention, and has a processus | protrusion parallel to an axial direction on the surface. It is a schematic side view of another example of the manufacturing apparatus of the prepreg which concerns on one form of this invention.

Explanation of symbols

1: Package 2: Reinforced fiber bundle 3: Guide part 31: Guide roll 32: Guide roll 4: Comb 5: Heater 6: Drive roll having projections on the surface that vibrate in the axial direction and parallel to the axial direction 7: Guide Roll 8: Resin impregnation part 81: Introduction roll 82: Heater 83: Impregnation roll 84: Take-off roll 9: Release paper coated with matrix resin 10: Release paper 11: Roll body of unidirectional prepreg 12: Opening means

Claims (11)

  In a method for manufacturing a prepreg in which a plurality of reinforcing fiber bundles that are aligned and run parallel to one direction are impregnated with resin, a vibration that vibrates in the axial direction on the upstream side of the resin-impregnated portion and that has a projection parallel to the axial direction. While the roll having the surface has a ratio | Vr / Vf | of the absolute value of the peripheral speed Vr of the roll and the conveying speed Vf of the reinforcing fiber within the range of | Vr / Vf | <1, the reinforcing fiber bundle is axially A method for producing a prepreg that is supplied to a resin-impregnated portion after passing through while being brought into contact with a right angle direction.   The prepreg according to claim 1, wherein a ratio | Vr / Vf | of the absolute value of the peripheral speed Vr of the roll and the conveying speed Vf of the reinforcing fiber is in a range of 0.05 ≦ | Vr / Vf | ≦ 0.5. Manufacturing method.   The manufacturing method of the prepreg of Claim 1 or 2 whose rotation direction of the said roll and conveyance direction of a reinforced fiber bundle are the same.   The manufacturing method of the prepreg in any one of Claims 1-3 whose amplitude of the said roll is 0.5-20 mm.   The manufacturing method of the prepreg in any one of Claims 1-4 whose vibration frequency of the said roll is 0.5-30Hz.   The method for producing a prepreg according to any one of claims 1 to 5, wherein a reinforcing fiber bundle is opened between the roll and the resin-impregnated portion.   The method for producing a prepreg according to claim 1, wherein the reinforcing fiber bundle is a carbon fiber bundle.   A guide part for guiding the reinforcing fiber bundle, an aligning part for aligning the reinforcing fiber bundles conveyed via the guide part at a predetermined interval, and an impregnating part for impregnating the reinforcing fiber bundle aligned by the aligning part with resin And a prepreg manufacturing apparatus provided with at least one drive roll having a protrusion on the surface that vibrates in the roll axis direction between the alignment section and the impregnation section. .   The protrusion height t of the driving roll is set to a height exceeding r {[1 / cos (θ / 2)]-1} with respect to the roll radius r, and the angle θ formed between the adjacent protrusions and the roll axis is 5 The apparatus for producing a prepreg according to claim 8, which is ˜50 °.   The prepreg manufacturing apparatus according to claim 8 or 9, wherein the driving roll has a satin surface having a surface roughness of 3 to 20S.   The prepreg manufactured by the method in any one of Claims 1-7.

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