KR20190033686A - Method for preparing Long-fiber reinforced sheet using prepreg - Google Patents

Abstract

The present invention relates to a method for manufacturing a long fiber-reinforced sheet using a prepreg, which improves formability and productivity using a prepreg applied with a reinforced fiber, comprising the steps of: in an insertion guide part (10), supplying a unidirectional prepreg (2) including a reinforced fiber in a longitudinal direction from; in a slitting part (20), cutting the unidirectional prepreg (2) supplied from the insertion guide part (10) in a longitudinal direction to form a plurality of prepreg tapes (4) extending in a longitudinal direction; in a cutting part (50) cutting the longitudinally extending prepreg tapes (4) in a perpendicular direction of the longitudinal direction, and forming a plurality of prepreg chips (6); in a collection plate (66), collecting the prepreg chips (6) formed by the cutting part (50) in a sheet shape; and melting and pressing the prepreg chips (6) collected in the sheet shape.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a long fiber reinforced sheet using a prepreg,

The present invention relates to a method for manufacturing a long fiber-reinforced sheet using a prepreg, and more particularly, to a method for manufacturing a long fiber-reinforced sheet using a prepreg which is widely used as an intermediate material for forming a composite material in various industrial fields.

A prepreg is an abbreviation of "Preimpregnated Material" means a product in the form of a sheet in which matrix is preliminarily impregnated with reinforcing fibers and is used as an intermediate material for composite material molding. Generally, prepregs are classified into unidirectional prepregs in which the reinforcing fibers are aligned in one direction and woven prepregs in which the reinforcing fibers are in the form of a fabric. In general prepregs, carbon fibers and the like having high strength and elasticity are used as the reinforcing fibers, and polymeric resins such as epoxy resin are mainly used as the matrix.

The reason why the prepreg is applied to the composite material molding is that the ratio between the matrix (resin) and the reinforcing material (reinforcing fiber) can be precisely controlled, and the material properties of the designed material can be maximized. In addition, since the intermediate material is used for the composite material forming process using the prepreg, the cost of the raw material is high, but the molding process is simple and simple, so that the operation cost can be reduced. Because prepreg has mainly sheet form, it is easy to handle, energy cost is reduced during molding, and the number of parts required for processing can be reduced due to the nature of cutting, and it can be applied not only to prepreg sheet but also to tape form and chip form And is widely used as an intermediate material for composite molding in various industrial fields such as aerospace, space, automobile, sports, leisure, civil engineering, and construction. However, the conventional unidirectional or woven prepregs are excellent in rigidity, but they are heavy because they have a large density, and in order to obtain a desired rigidity, prepregs of several layers must be laminated, resulting in an increase in thickness of the molded articles. Further, in the case of unidirectional prepreg, since the direction of lamination must be considered in order to impart isotropy to the molded product, molding of complicated structures is limited.

Accordingly, an object of the present invention is to provide a method of manufacturing a long fiber-reinforced sheet using a prepreg.

Another object of the present invention is to provide a method for producing a long fiber-reinforced sheet which improves physical properties and formability and productivity by using a prepreg to which a reinforcing fiber is applied.

In order to achieve the above object, the present invention provides a method of manufacturing a reinforcing fiber, comprising the steps of: feeding a unidirectional prepreg (2) containing reinforcing fibers in a longitudinal direction in an inserting guide section (10); Forming a plurality of prepreg tapes 4 extending in the longitudinal direction by cutting the unidirectional prepreg 2 supplied from the insertion guide portion 10 in the longitudinal direction in the slitting portion 20; Forming a plurality of prepreg chips (6) by cutting the prepreg tape (4) extending in the longitudinal direction in a direction perpendicular to the longitudinal direction in the cutting portion (50); The prepreg chips 6 formed in the cutting portion 50 are collected in a sheet form at the collecting plate 66; And a step of melt-pressing the prepreg chip (6) collected in the sheet form.

As described above, the method for producing a long fiber-reinforced sheet using the prepreg according to the present invention can produce a long fiber-reinforced sheet having improved physical properties and moldability and productivity by using a prepreg to which a reinforcing fiber is applied .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining a method for producing a long fiber-reinforced sheet according to the present invention;
2 is a view showing an insertion guide portion 10 according to the present invention.
3 is a view showing the operation principle of the slitting part 20 according to the present invention.
4 is a view showing a cutting method of the slitting part 20 according to the present invention.
5 is a view showing a cutter type of the cutter portion 50 according to the present invention
6 is a view showing the separating means of the cutter portion 50 according to the present invention.
7 is a view showing a process in which the prepreg chip 6 formed in the cutter unit 50 according to the present invention is collected in the form of a sheet.
8 is a view showing the dispersion of the prepreg chip 6 according to the distance between the cutting portion 50 and the collecting plate 66 according to the present invention.
9 is a schematic diagram of an overall apparatus for producing a long fiber-reinforced sheet according to another embodiment of the present invention.
10 is a view showing the pressing roller 74 of the pressing portion 70 according to the present invention.
11 is a graph showing the thickness of long fiber-reinforced sheet 8 versus compression conditions according to an embodiment of the present invention.

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

1 is a view for explaining a method for producing a long fiber-reinforced sheet according to the present invention. 1, in order to manufacture a long fiber prepreg sheet (hereinafter referred to as LFPS [Long Fiber Prepreg Sheet]) according to the present invention, a unidirectional prepreg 2 containing reinforcing fibers is inserted into the insertion guide portion 10 Supply.

First, the unidirectional prepreg 2 supplied from the insertion guide portion 20 is a unidirectional prepreg 2 to which reinforcing fibers are applied, and includes a reinforcing fiber and a matrix. The unidirectional prepreg 2 is made of a reinforcement material including carbon fiber, glass fiber, Bassalt fiber, aramid fiber, cellulose fiber and other oil / Can be used. As the resin composition of the unidirectional prepreg (2), an epoxy resin, a phenol resin, an unsaturated polyester resin, a vinyl ester resin, a urethane resin, a polypropylene resin, a polyphenylene sulfide resin, Thermosetting resin and thermoplastic resin used as a material can be used. The thickness of the unidirectional prepreg 2 containing the reinforcing fibers can be used according to a desired thickness, and is usually 0.02 to 0.6 mm.

Reinforced sheet, which is a composition of the unidirectional prepreg 2 containing the reinforcing fiber, affects the manufacturing process of the next long fiber-reinforced sheet due to the tackiness, which is a raw material characteristic of the resin, the melting temperature of the composition and the toughness of the reinforcement.

As shown in FIG. 1, the unidirectional prepreg 2 to which the reinforcing fibers are applied is fed in the longitudinal direction in the insertion guide portion 10. Here, the longitudinal direction means the longitudinal direction of the fibers included in the unidirectional prepreg 2. As described above, the unidirectional prepreg 2 is a prepreg in which fibers are arranged in one direction in a resin, and the width of the prepreg (the direction perpendicular to the unidirectional fiber) is usually 400 to 600 mm, for example, 500 mm, The length can be freely manufactured and used in the required length

1, the insertion guide portion 10 includes a feed roller 12 wound with a unidirectional prepreg 2 and a reinforcing fiber wound around the feed roller 12, And a guide roller (guide roller) 14 for guiding the prepreg 2 to the slitting portion 20. FIG. 2 is a view showing a specific example of the insertion guide portion 10. FIG. 2, the insertion guide portion 10 includes a feed roller 12 on which the unidirectional prepreg 2 is wound, a unidirectional prepreg 2 wound on the feed roller 12, A guide roller 14 for guiding the unidirectional prepreg 2 to the slider portion 20 and a puller 16 for pulling the unwound unidirectional prepreg 2 to the slider portion 20, And a guide plate (18) for moving the guide plate (18).

The feeding roller 12 adjusts the tension and unwinds and uncovers the unidirectional prepreg 2 containing the reinforcing fibers in the roll state. The feed roller 12 may include a rotating shaft electromagnetic brake (Powder Brake) to adjust the tension. The unidirectional prepreg 2 containing the wound reinforcing fibers is moved to the puller 16 by a guide roller 14 which adjusts the tension of the left and right tensions. The puller 16 is a roller for pulling the unidirectional prepreg 2 containing the wound reinforcing fibers so that the unidirectional prepreg 2 can be inserted into the slitter portion 20. The unidirectional prepreg 2 containing the reinforcing fibers having passed through the puller 16 moves to the slitter portion 20 through the guide plate 18. [

The unidirectional prepreg 2 containing the reinforcing fibers may have adhesiveness depending on the raw material of the resin. Depending on the raw material of the resin, the unidirectional prepreg 2 which is tacky may require an additional winding roll capable of recovering the release film or release paper. However, additional unrolling rolls may not be necessary since unidirectional prepregs 2 that are not tacky do not have other release materials. The guide plate 18 may coat the guide plate 18 with Teflon or may include a chiller to reduce the adhesive force of the unidirectional prepreg 2 including tackifying reinforcing fibers. have.

Next, the unidirectional prepreg 2 supplied from the insertion guide portion 10 is cut in the longitudinal direction in the slitting portion 20 to form a plurality of prepreg tapes 4 extending in the longitudinal direction. The width of the prepreg tape 4 is 5 to 25 mm, preferably 6 to 18 mm, more preferably 8 to 10 mm, for example 8 mm, and the thickness is equal to the thickness of the prepreg . Here, if the width of the prepreg tape 4 is too wide, there is a problem that molding processability is deteriorated. If the prepreg tape 4 is too narrow, there is a problem that the reinforcing material in the process is broken to cause defects.

 3 is a view for explaining the operation principle of the slitting part 20 used in the method for producing a long fiber-reinforced sheet according to the present invention. As shown in Fig. 3 (a), the unidirectional prepreg 2 is cut to a constant width in the direction of 0 ° of the fiber (longitudinal direction) by using the upper surface 21, The unidirectional prepreg 2 is cut into a predetermined width in the longitudinal direction by the interval of the multiple blades constituted by the upper surface 22 and the lower surface 23 while the multiple blades constituted by the upper surface 22 and the lower surface 23 are engaged with each other A prepreg tape 4 is formed.

4 is a view showing a cutting method of the slitting part 20 used in the method of manufacturing a long fiber-reinforced sheet according to the present invention. The slitter portion 20 can select a slitting method in consideration of the tackiness of the resin, the width of the long fiber-reinforced sheet (8, LFPS) chip, and the wear characteristics of the blade of the slitter. 4A), shear cutting (FIG. 4B), scoring cutting (FIG. 4C), special gang cutting (Special Gang cutting, Fig. 4 (d)). The laser cutting (a in FIG. 4) is a method of slitting using a commercially available blade 24. Even laser cutting, air cutting laser cutting can be used by anyone with simple mechanism and operation, easy to adjust the gap of the desired slitter width, and easy to exchange blade. In general, except for hard or thick materials, various film materials, medicines. It can be used for food-use laminates films and the like. 4B), the upper and lower blades 25 and 26 are slid while engaging the upper and lower blades 25 and 26, with the pair of upper and lower blades 25 and 26 having the same scissors on the outer side of the rotating circular knife. Generally, shear cutting is used for products or scales that require precision, and is used for slitting rigid or thick materials and films impossible with laser cutting. The score cutting (c in Fig. 4) is a method in which a round knife 27 is pushed against a hard lower roll 28 and a nick is cut into the material. And is mainly used for trimming of both ends in a slit of various adhesive tapes or in a laminating process. The special gang cutting (d in Fig. 4) is slit while the upper surface 29 and the lower surface 30 are engaged with each other.

Next, the prepreg tape 4 is cut in the vertical direction in the longitudinal direction in the cutting portion 50 to form the prepreg chip 6. The length of the prepreg chip 6 is 10 to 100 mm, preferably 15 to 80 mm, more preferably 25 to 50 mm, and the thickness is equal to the thickness of the prepreg. Here, if the width of the prepreg chip 6 is too long, there is a problem that the formability and the degree of dispersion decrease, and when the width of the prepreg chip 6 is too short, the property is deteriorated.

5 is a view showing a cutter type of a cutting portion 50 that can be used in the method of manufacturing a long fiber-reinforced sheet according to the present invention. As shown in FIG. 5, a guillotine cutter 51 and a rotary cutter 56 may be used as the cutter of the cutting unit 50. The guillotine cutter 51 is in a short form and cuts the prepreg tape 4 into a transverse length by using the upper surface 53 and the lower surface 55. The rotary cutter 56 is cut and the prepreg tape 4 is cut by the interval of the blade 57 while rotating. The length of the prepreg chip 6 can be adjusted in consideration of the rotational speed of the rotary cutter 56, the interval of the blade 57, and the like. Since the rotary cutter 56 is faster than the guillotine cutter 51, it is preferable to use the rotary cutter 56 in the present invention.

And a prepreg chip separating means for separating the prepreg chip 6 cut from the cutting portion 50 at the rear end of the cutting portion 50. There is a phenomenon that the prepreg chip 6 becomes sticky and can not be separated from the rotary blade 57 (cutter blade). To solve this problem, a prepreg chip separating means is used. 6 is a view showing the prepreg chip separating means. 6, an air knife 58 (FIG. 6A), a brush roller 59 (FIG. 6B), or the like can be used as the prepreg chip separating means. The air knife injects the condensed air to separate the prepreg chip 6 from the rotary knife 57. The brush roller 59 may be disposed at the rear end of the rotary cutter 56 to physically separate the prepreg chip 6.

Next, the prepreg chip 6 formed in the cutting portion 50 is collected in the form of a sheet at the collecting plate 66. 7 is a view showing a process in which prepreg chips 6 are collected in a sheet form. 6, the prepreg chips 6 formed in the cutting portion 50 are randomly dispersed and dropped onto the collecting plate 66. As shown in Fig. At this time, an outlet 64 for collecting and discharging the prepreg chip 6 is included so that the prepreg chip 6 can be collected on the collecting plate 66. The collecting plate 66 can raise the viscosity of the resin to a heated plate, and the prepregs can be tacky and adhere to each other. The lamination thickness of the prepreg chips 6 collected on the plate is generally 1 to 20 mm, preferably 1 to 10 mm, more preferably 2 to 5 mm, for example, 3.5 mm.

The reason for randomly dispersing the prepreg chip 6 is that, in the case of unidirectional prepreg, the lamination direction must be considered in order to impart isotropy to the molded product, and there is a limit in forming a complicated structure. However, If the leg chips 6 are randomly dispersed, it is possible to overcome such limitations and to improve moldability and productivity. An air blower may be used to improve the degree of dispersion.

The distance between the cutting portion 50 and the collecting plate 66 can be appropriately set in accordance with the dispersion degree of the prepreg chip 6, the size and density of the prepreg chip sheet, and the like. 8 is a view showing the dispersion of the prepreg chip 6 according to the distance between the cutting portion 50 and the collecting plate 66. As shown in FIG. 8, the dispersion of the prepreg chip 6 according to the distance between the cutting portion 50 and the collecting plate 66, based on the sheet set to 300 mm in width and 300 mm in length in the figure, The difference can be confirmed. When the distance between the cutting portion 50 and the collecting plate 66 is 20 cm, 200 sheets of the prepreg chips 6 are seated on the sheet, but they are concentrated at the center and are uneven in the fiber arrangement. When the distance is 40 cm, 198 pieces are seated on the seat set by the prepreg chip 6, but there is a problem that they can not be filled. When the distance is 60 cm, 189 pieces are appropriately dispersed on the sheet set by the prepreg chip 6 and the fiber arrangement is also excellent. 8, the distance between the cutting portion 50 and the collecting plate 66 is 400 to 800 mm, preferably 500 to 700 mm. If the distance is too high, the dispersion and the arrangement of the chips 6 are good. However, if the distance is too high, the number of falling chips 6 falling out of the sheet width of the product is not good, Lengthwise direction), which results in poor dispersion.

9 is a schematic diagram showing an overall configuration of a long fiber reinforced sheet 8 according to another embodiment of the present invention. In the embodiment shown in Fig. 9, the long fiber-reinforced sheet 8 is manufactured by using the two or more cutting units 52, 54 having different dropping distances of the prepreg chip 6 with the cutting unit 50 . 9, the distance between the first cutting device 52 and the collecting plate 66 is set larger than the distance between the second cutting device 54 and the collecting plate 66. As shown in Fig. The distance between the first cutting device 52 and the collecting plate 66 is generally 600 to 700 mm and the distance between the second cutting device 54 and the collecting plate 66 is generally 400 to 500 mm.

If the installation height of the cutting devices 52 and 54 is different, the prepreg chip sheets having different degrees of dispersion, size, and density are overlapped with each other, so that the formability and physical properties of the long fiber-reinforced sheet are varied desirable.

9, when two or more cutting devices 52 and 54 are used, a plurality of prepreg tapes 4 formed in the slitting part 20 are separated into two or more cutting devices 52 and 54 A separating guide 40 is provided between the slitting portion 20 and the cutting portion 50 to supply the cutting guide portion 40. [

The separation guide unit 40 includes a pulling roller 42 for pulling the prepreg tape formed in the slitting unit 20 and a prepreg tape pulled out from the pulling roller 42 by two or more cutting devices 52 and 54 Reinforced sheet 8 including guide rollers 44 and 46 for separating and moving the sheet.

The pull-out roller 42 pulls the prepreg tape 4 supplied from the slitting portion 20 to the cutting portion 50. And may include additional parts for adjusting the tension of the drawing-out roller 42.

The prepreg tape 4 that is output from the drawing-out roller 42 is moved from the guide rollers 44 and 46 to the two or more cutting devices 52 and 54. The odd-numbered prepreg tape 4 is fed to the first guide roller 44 while the even-numbered prepreg tape 4 is fed to the first guide roller 44. The odd- 2 guide rollers 46, respectively. For example, with respect to the position of the prepreg tape 4, the first, third, and fifth prepreg tapes are drawn out to the first guide roller 44, and the second, fourth, 46). The first guide roller 44 and the second guide roller 46 adjust the tension and move the prepreg tape 4 to two or more cutting devices 52 and 54 having different dropping distances.

Finally, the prepreg chip 6 collected in the sheet form is melt-pressed in the crimping portion 70. Fig. 10 is a view showing the pressing roller 74 of the pressing portion 70. Fig. The temperature of the pressing roller 74 of the pressing portion 70 can be set according to the type of resin. It is important that the prepreg chips 6 containing the thermosetting resin are not cured, but that the prepreg chips 6 are squeezed by setting a proper temperature at which melting of the resin occurs. For example, when an epoxy resin is used, 60 to 80 占 폚 is appropriate. It is important that the prepreg chip 6 containing the thermoplastic resin causes melting of the resin at a temperature higher than the melting point but proceeds at a temperature below the boiling point.

The pressing portion 70 can set the number of times of pressing in order to obtain a long-fiber-reinforced sheet 8 having high productivity. When the pressing is performed once, the density of the prepreg chips 6 is low, ) Is thick and contains pores such as air and gas, which may cause problems in the molding process or deteriorate physical properties after molding. If the pressing is performed three times or more, the thickness of the sheet 8 is reduced, but there is a possibility that the prepreg chip 6 is detached outside the width of the sheet 8 set by heat and pressure, . Therefore, the two-time pressing is suitable for the thickness of the long fiber-reinforced sheet 8 and the removal of the inner pores, and the molded article has excellent physical properties after molding.

With reference to this, the crimping portion 70 uses two rollers of a heating / pressurizing device, and the pressure and temperature of the rollers are set differently depending on the resin. The pressure and temperature of the crimping portion 70 are set in accordance with the resin of the prepreg. The thermosetting resin can be set to a temperature equal to or higher than a temperature at which resin flowability occurs, and at a temperature equal to or lower than a temperature at which a curing reaction occurs. For example, the temperature can be set at 25 to 150 ° C at normal temperature, and the roller temperature can be set at 50 to 90 ° C in the case of epoxy resin. The thermoplastic resin can also be squeezed by setting the melting point at which resin fluidity occurs and the temperature at or below the deterioration point (boiling point). This also depends on the resin.

The temperature can be set by referring to Table 1 below.

Molecular arrangement Polymer type Tg (占 폚) Tm (占 폚) Semi-crystalline Polypropylene
(PP, polypropylene) -10 175 Semi-crystalline High density polyethylene
(HDPE, Highdensity polyethylene) -125 135 Amorphous polystyrene
(PS, Polystyrene) 100 Since it softens gradually until it melts, the exact Tm temperature can not be known. Amorphous Polycarbonate
(PC, Polycarbonate) 150 Since it softens gradually until it melts, the exact Tm temperature can not be known. Semi-crystalline Polyamide 6
(PA6, Polyamide 6) 50 215 Semi-crystalline Polyether ether ketone
(PEEK, Polyetheretherketone) 145 335 Amorphous Polyetherimide
(PEI, Polyetherimide) 218 Since it softens gradually until it melts, the exact Tm temperature can not be known. Amorphous Acrylonitrile butadiene styrene (ABS) 110 Since it softens gradually until it melts, the exact Tm temperature can not be known.

Referring to Table 1, the two rollers of the crimping portion 70 are based on an epoxy resin, the temperature of the first roller 76 is usually 60 to 70 ° C, and the pressure of the first roller 76 is usually 8 To 10 kgf / cm < 2 >. The temperature of the second roller 78 is usually 70 to 80 DEG C, and the pressure of the second roller 78 is usually 15 to 20 kgf / cm < 2 >. The prepreg chip 6 is melt-pressed to obtain a long fiber reinforced sheet 8 having a thickness of 0.5 to 4 mm.

The crimping portion 70 further includes a winding roller 80 for winding the formed long fiber-reinforced sheet 8 in the form of a roll. The winding roller 80 winds the long fiber-reinforced sheet 8 formed from the crimping portion 70 in the form of a roll. The long fiber-reinforced sheet 8 is obtained in the form of a roll by a take-up roller 80. As described above, the long fiber-reinforced sheet 8 having improved physical properties and moldability and productivity of a metal level or more is used in various industries.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.

[Example 1] Production of long fiber reinforced sheet

The prepreg chip 6 was prepared by a method of the manufacturing process. The prepreg chip 6 has a width of 8 mm and a length of 25 mm. The prepreg chips 6 were randomly dispersed and collected in a size of 300 mm and 300 mm. The collected prepreg chips 6 were set at a compression temperature of 80 캜, a pressure of 17 Kgf / cm and a LS of 3 m / min at the compression bonding section 70, and the number of times of compression, The thickness of the sheet 8 (LFPS) is shown in Table 2 and Fig.

[Example 2] Production of long fiber reinforced sheet

Except that the temperature was set at 120 占 폚, the pressure was 17 Kgf / cm and the L / S was 3 m / min. As in Example 1, the thickness of the long fiber-reinforced sheet 8 according to the number of times of pressing 1, 2, and 3 is shown in Table 2 and FIG. 11 in comparison.

[Example 3] Production of long fiber reinforced sheet

Except that the temperature was set at 120 DEG C, the pressure was 8 Kgf / cm and the L / S was 3 m / min. As in Example 1, the thickness of the long fiber-reinforced sheet 8 according to the number of times of pressing 1, 2, and 3 is shown in Table 2 and FIG. 11 in comparison.

Item comparison target After dispersion 1 squeeze Squeeze twice Crimping 3 times Long fiber-reinforced sheet thickness
(mm) Example 1 3.5 2.3 2 2 Example 2 3.5 2.1 1.9 1.8 Example 3 3.5 2.7 2.2 2.1

As shown in Table 2, for Examples 1, 2, and 3 prepared at different temperatures and pressures, the change in the thickness of the long fiber-reinforced sheet according to the number of times of pressing was compared. Therefore, it was confirmed that the desired long fiber-reinforced sheet thickness can be obtained by appropriately setting the compression temperature and pressure at the time of compression by the compression bonding portion 70. INDUSTRIAL APPLICABILITY As described above, the prepreg using the reinforcing fiber according to the present invention can be used to apply a long-fiber reinforced sheet having excellent moldability and productivity to various industries.

Claims (7)

Feeding the one-way prepreg (2) containing reinforcing fibers in the longitudinal direction of the reinforcing fibers in the insertion guide portion (10);
Forming a plurality of prepreg tapes 4 extending in the longitudinal direction by cutting the unidirectional prepreg 2 supplied from the insertion guide portion 10 in the longitudinal direction in the slitting portion 20;
Forming a plurality of prepreg chips (6) by cutting the prepreg tape (4) extending in the longitudinal direction in a direction perpendicular to the longitudinal direction in the cutting portion (50);
Dropping the prepreg chips (6) formed in the cutting portion (50) and stacking them in a sheet form at the collecting plate (66); And
And melt-pressing the prepreg chip (6) laminated in the sheet form.
The prepreg chip (6) according to claim 1, wherein the prepreg chip (6) has a width of 8 to 10 mm and a length of 25 to 50 mm. A method for manufacturing a long fiber reinforced sheet. The apparatus of claim 1, wherein the cutting portion (50) comprises two or more cutting devices (52,54) of different heights, the prepreg chips (6) are stacked in sheet form by falling at two or more dropping distances By weight of the sheet. The method of claim 3, wherein a plurality of prepreg tapes (4) formed in the slitting portion (20) are separated and fed by two or more cutting devices (52, 54) A method for manufacturing a reinforced sheet. According to the fourth aspect of the present invention, the separating guide unit 40 separates the odd-numbered prepreg tape 4 from the position of the prepreg tape 4 through the first guide roller 44, And the even-numbered prepreg tape 4 is pulled out through the second guide roller 46 to the lower cutting device 54. The method for producing a long fiber-reinforced sheet according to claim 1, The method of any one of the preceding claims, wherein the distance between the cutting portion (50) and the collection plate (66) is 500 to 700 mm. The method according to claim 1, wherein the unidirectional prepreg (2) is selected from the group consisting of reinforcing fibers selected from the group consisting of carbon fibers, glass fibers, bar-cut fibers and polymer fibers, and epoxy resins, unsaturated polyesters and phenolic resins And a thermoplastic resin selected from the group consisting of a thermosetting resin or a thermoplastic resin selected from the group consisting of polyethylene, polypropylene, urethane resin, polyphenylene sulfide, polyetheretherketone, and the like.

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