JP2006022471A - Fiber-reinforced sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiber-reinforced sheet which is reinforced biaxially so that the biaxial directions may be symmetric with respect to the longitudinal direction of the sheet. <P>SOLUTION: The fiber-reinforced sheet 1 is produced by the following process: a fibrous sheet 3 made by uniaxially arranging fiber bundle 2 in parallel is wrapped by sequentially turning back so as to be mutually superimposed at an angle of inclination of θ° along a pair of turn back guides 12 to obtain the objective sheet 1 composed of a first fibrous sheet layer 4 with an angle of +θ and a second fibrous sheet layer 5 with an angle of -θ° with the longitudinal direction of the final sheet 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a biaxial fiber reinforced sheet using reinforcing fiber bundles such as carbon fiber bundles, glass fiber bundles, and aramid fiber bundles.

(Content of fiber reinforced sheet)
Conventionally, the following is proposed as a fiber reinforced sheet.

(1) Unidirectional fiber reinforced sheet A unidirectional fiber reinforced sheet is a sheet in which fiber bundles are aligned in one direction. Although this is a sheet obtained by a simple operation, there is a problem that it is impossible to obtain isotropy for obtaining similar strength characteristics in various directions because it is strengthened only in one direction.

  Although isotropic properties are obtained by lamination, there is a problem that application to a wide range is difficult because the size of the laminated sheet is limited. In addition, there is a problem that the laminating work is complicated.

  Since they are arranged in one direction, there is a problem that it is difficult to form a sheet with only fiber bundles.

(2) Biaxial fiber reinforced sheet A biaxial fiber reinforced sheet is a sheet | seat which consists of a textile fabric or a knitted fabric. This is because the reinforcing directions are the warp direction and the weft direction. That is, reinforcement is performed in the directions of 0 ° and 90 °.

  Therefore, there is a problem that the material cost for obtaining the weaving or knitting process increases.

  Although it can exist as a sheet only with fibers, there is a problem of lack of isotropy.

  Isotropicity can be obtained by stacking, but the stacking takes into account the stacking angle when stacking. Moreover, since the size of the laminated sheet is limited, there is a problem that application to a wide range is difficult. Furthermore, there is a problem that the laminating work is complicated.

(3) Multiaxial fiber reinforced sheet (triaxial woven fabric, multiaxial reinforced stitch base material)
A triaxial fabric is a fabric in which fibers are inserted in directions of 0 °, 60 °, and 120 °.

  Therefore, there is a problem that the material cost increases due to the weaving process, but the isotropic property is improved.

  However, from the viewpoint of the woven structure, there is a problem that the space between the yarns can be widened and the fiber-rich portion and the resin-rich portion are separated.

  The multiaxial reinforcing stitch base material is a sheet in which fibers are oriented in the directions of 0 °, + 45 °, −45 °, and 90 °, and then reinforcing fibers are integrated with stitch yarns. Isotropicity is improved because it is reinforced in four directions. Some manufacturing apparatuses can perform orientation at more angles (for example, + 30 °, −30 °, + 60 °, −30 °).

  However, there is a problem that equipment is expensive because the manufacturing apparatus is large.

  The presence of the stitch yarn causes a problem of resin impregnation. In particular, when a thermoplastic resin is used as a matrix, there are problems in impregnation and compatibility.

  There is a problem that the stacking angle cannot be easily changed.

  When orienting the fibers, because the fiber is hooked on the needles at both ends of the sheet, the fiber width changes extremely at both ends of the sheet and narrows when using spread fibers. is there.

  There is a problem that a sheet material impregnated with resin cannot be used because it is hooked with a needle.

(Fiber-reinforced sheet manufacturing equipment)
For example, the following invention has been proposed as a manufacturing apparatus for the above-described multiaxial fiber reinforced sheet.

(1) First Conventional Invention The first conventional invention relates to a method and an apparatus for manufacturing a multiaxial stitch base material by a spread yarn (see Patent Document 1).

  This first conventional invention has the problem that the needle structure at both ends is the same, and the width of the spread yarn is narrowed.

  Further, as described above, there is a problem that a sheet impregnated with resin cannot be used.

(2) Second Conventional Invention The second conventional invention considers the use of a spread yarn (see Patent Document 2).

  In the second conventional invention, sheets are cut and bonded together without using needles at both ends.

  Therefore, according to this conventional invention, it is possible to manufacture a sheet material reinforced with fibers other than the directions of 0 ° and 90 °. However, this manufacturing apparatus has a problem that it is large in size and requires equipment cost.

  Since the sheet is inserted in consideration of the process of cutting the sheet at both ends, it is difficult to increase the processing speed and the sheet cost cannot be reduced.

(3) Third Conventional Invention The third conventional invention is a fixed yarn that makes a reinforcing sheet in the ± θ ° direction and prevents the fiber sheet in the + θ ° direction and the fiber sheet layer in the −θ ° direction from separating. (See Patent Document 3).

  The 3rd conventional invention has a problem that it cannot be used for the fiber sheet which supplies an open yarn or a prepreg sheet.

Since the method in which the supply bobbin is rotated 90 ° at both ears of the sheet is used, there is a problem that the sheet width is deformed when the supplied fiber is a sheet.
WO01 / 63033 Special table 2001-516406 JP-A-9-169070

  As described above, the fiber reinforced sheet has the following problems.

  The first problem is to reduce the material cost. In other words, the carbon fiber bundle has a problem that the price becomes lower as the fineness becomes larger, but the impregnation property of the resin becomes worse. Further, when used in a woven fabric, there is a problem that the bending of the woven yarn becomes large and the strength characteristics are reduced.

  The second problem is a pseudo-isotropic problem. That is, the reinforcing direction of the fibers is increased so that the strength characteristics are substantially the same in any direction of the sheet. However, in a sheet in which fibers are simply laminated at various angles, there is a problem that deformation such as warpage or bending of the plate material occurs when it becomes a composite plate material. For this reason, fiber lamination considering the symmetry in the longitudinal direction of the sheet and the thickness direction of the sheet is important.

  In view of the above problems, the present invention makes the following proposal.

  The first object is to provide a fiber reinforced sheet reinforced in biaxial directions other than 0 ° and 90 °, the biaxial direction being symmetrical with respect to the longitudinal direction of the fiber reinforced sheet. It is.

  That is, this makes it easy to obtain a pseudo-isotropic large composite material plate reinforced with fibers in various directions. Further, if the stacking order is symmetric in the thickness direction, it is possible to obtain a plate material that can easily eliminate warpage and bending as a stacked plate.

  The second object is to provide a fiber bundle that enables the use of a fiber bundle having a large fineness. That is, a thick fiber bundle can be used in the form of a sheet by opening, and material costs can be reduced.

  A third object is to provide a sheet material that can be used with a resin-impregnated sheet material. In particular, the present invention provides a product capable of developing a composite material molded product such as a thermoplastic resin.

  A fourth object of the present invention is to provide a manufacturing method that eliminates the change in sheet width at both ears, thereby enabling the manufacture of a resin-impregnated sheet or the like.

  A fifth object is to provide a device in which both ear portions are fixed, so that the fiber bundle does not disperse and can exist as a sheet without stitch yarn.

  The invention according to claim 1 is a fiber reinforced sheet, wherein at least one fiber sheet in which fiber bundles are aligned in one direction with respect to the longitudinal direction of the fiber reinforced sheet is a predetermined angle θ ° (however, First, the fiber sheet is wound in a spiral manner so as to overlap with each other with an inclination of 0 ° <θ ° <90 °, and the fiber sheet direction is + θ ° with respect to the longitudinal direction. A fiber reinforced sheet comprising two layers of a fiber sheet layer and a second fiber sheet layer having a fiber sheet direction of −θ ° with respect to the longitudinal direction.

  The invention according to claim 2 is the fiber reinforced sheet according to claim 1, wherein the first fiber sheet layer and the second fiber sheet layer are in close contact with each other.

  The invention according to claim 3 is characterized in that the first fiber sheet layer and the second fiber sheet layer positioned at both ears of the fiber reinforced sheet are bonded and fixed by an adhesive. Item 3. A fiber-reinforced sheet according to item 1 or 2.

  The invention according to claim 4 is characterized in that at least one of the fiber bundles constituting the fiber sheet is a spread yarn that is a fiber bundle continuously opened in a wide and thin state. The fiber-reinforced sheet according to item.

  The invention according to claim 5 is characterized in that the fiber sheet is made of a heat-bonding yarn or a fiber bundle to which a sealing agent is attached. It is a fiber reinforced sheet.

  The invention according to claim 6 is the fiber reinforced sheet according to at least one of claims 1 to 4, wherein the fiber sheet is a prepreg sheet impregnated with a thermoplastic resin.

  The invention according to claim 7 is the fiber reinforced sheet according to at least one of claims 1 to 4, wherein the fiber sheet is a prepreg sheet impregnated with a thermosetting resin.

  The invention according to claim 8 is characterized in that the first fiber sheet layer and the second fiber sheet layer are bonded by performing pressure treatment or pressure treatment while heating. To 7. The fiber-reinforced sheet according to at least one of items 7 to 7.

  The invention according to claim 9 is the fiber reinforced sheet according to at least one of claims 1 to 8, wherein 15 ° = <θ ° = <75 °.

  The invention according to claim 10 is the fiber reinforced sheet according to at least one of claims 1 to 9, characterized in that a plurality of the fiber sheets are folded in a state of being arranged.

  In the fiber reinforced sheet of the present invention, the orientation direction of the fiber bundle is ± θ ° direction, and if this fiber reinforced sheet is used, there is a quasi-isotropic property, and the laminate is symmetrically laminated in the thickness direction. A plate material can be realized.

(Configuration of fiber reinforced sheet)
Hereinafter, the fiber reinforced sheet 1 of the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a plan view of a fiber reinforced sheet 1 of the present embodiment, and FIG. 2 is a longitudinal sectional view thereof.

  The fiber reinforcing sheet 1 is formed by stacking the fiber sheets 3 in which the fiber bundles 2 are aligned in one direction with an inclination of a predetermined angle θ ° (hereinafter referred to as a winding angle θ) with respect to the longitudinal direction of the fiber reinforcing sheet 1. In this way, the first fiber sheet layer 4 having a fiber sheet 3 direction of + θ ° and the second fiber sheet layer 5 having a fiber sheet 3 direction of −θ ° The double-sided adhesive tapes 6 and 6 for bonding the first fiber sheet layer 4 and the second fiber sheet layer 5 are present at both ears of the fiber reinforced sheet 1.

  Here, the winding angle θ ° is 0 ° <θ ° <90 °, and preferably 15 ° = <θ ° = <75 °. In addition, it becomes the longitudinal direction of the fiber reinforced sheet 1 when θ ° = 0 °, and the width direction when it is 90 °.

  When this fiber reinforced sheet 1 is used, it is quasi-isotropic and becomes a symmetrical laminate in the thickness direction, so that a large composite plate material can be realized.

  Hereinafter, each Example about the manufacturing apparatus for manufacturing this fiber reinforced sheet 1 is described.

(First embodiment)
A manufacturing apparatus 10 according to the first embodiment will be described with reference to FIGS.

  FIG. 3 is a structure of the fiber reinforced sheet 1 manufactured by the manufacturing apparatus 10 of the present embodiment, and FIG. 4 is a perspective view of the manufacturing apparatus 10.

(1) Structure of manufacturing apparatus 10 The structure of the manufacturing apparatus 10 will be described with reference to FIGS.

  FIG. 4 is a perspective view of the manufacturing apparatus 10.

  First, the coordinate system in this specification is defined. In FIG. 4, the longitudinal direction of the fiber reinforced sheet 1 is set as the Z-axis direction, the width direction of the fiber reinforced sheet is set as the X-axis direction, and the direction orthogonal to the width direction is set as the Y-axis direction.

  As shown in FIG. 4, a pair of left and right folding guide portions 12 are provided in parallel to each other along the Z axis at locations corresponding to the positions of both ear portions of the fiber reinforced sheet 1.

  First, the left folding guide portion 12 will be described with reference to FIG.

  The folding guide part 12 is a cylindrical body having a linear cross section and has a hollow part 14 therein.

  A pair of tape supply rolls 20 and 22 are disposed on the upper part of the folding guide part 12 so that the double-sided adhesive tapes 16 and 18 are supplied downward along the front and rear surfaces of the folding guide part 12. The tape supply rolls 20 and 22 are rotated with a constant torque by the torque control motors TM4 and TM4.

  A release paper collecting roll 28 for collecting the two release papers 24 and 26 separated from the double-sided adhesive tapes 16 and 18 is disposed above the folding guide portion 12. The release paper collecting roll 28 is rotated by a torque control motor TM3.

  Here, the movement of the double-sided adhesive tapes 16 and 18 will be described. The sheets are supplied along the front surface and the rear surface of the folding guide portion 12, respectively. At this time, the release papers 24 and 26 are present on the surfaces in contact with the folding guide portion 12. Therefore, the double-sided adhesive tapes 16 and 18 do not adhere to the folded guide portion 12. When reaching the lower end position of the folding guide portion 12, the release papers 24 and 26 are folded upward and collected by the release paper collecting roll 28 through the hollow portion 14. On the other hand, the surfaces of the double-sided adhesive tapes 16 and 18 from which the release papers 24 and 26 have been peeled are bonded to each other, so that a single-sided double-sided adhesive tape 6 with the adhesive surfaces exposed on both sides is obtained.

  The right folded guide portion 12 has the same structure.

  A sheet supply roll 30 in which the fiber bundles 2 are aligned in one direction is disposed outside the pair of folding guide portions 12 (see FIG. 7). The sheet supply roll 30 is rotated by a torque control motor TM1. The rotation axis of the sheet supply roll 30 is arranged with an inclination of θ ° with respect to the longitudinal direction of the fiber reinforced sheet 1, that is, the Z axis.

  A laminated rotation device 32 is provided so that the torque control motor TM1 and the sheet supply roll 30 can be rotated integrally with the outer periphery of the pair of folding guide portions 12 in parallel with the XY plane.

  In this laminated rotating device 32, an arm member 36 protrudes outward from a ring-shaped ring gear 34, and a torque control motor TM1 is disposed at the tip of the arm member 36 with an angle θ °, and the rotation shaft of the torque control motor TM1 is provided. The rotating shaft of the sheet supply roll 30 is connected to the above.

  The ring gear 34 is rotated about an axis parallel to the Z axis by the rotation speed control motor SM2 via the gear 38.

  A pair of traveling rolls 40 and 42 for traveling the completed fiber reinforced sheet 1 are provided below the lamination rotating device 32. The traveling roll 42 is rotated by a rotation speed control motor SM1.

  A sheet collecting roll 44 for collecting the fiber reinforced sheet 1 is disposed below the traveling rolls 40 and 42, and the sheet collecting roll 44 is rotated by a torque control motor TM2.

  FIG. 6 is a block diagram of the manufacturing apparatus 10.

  A rotational speed control motors SM1 and SM2 and torque control motors TM1 and TM2, two TM3 and four TM4 are connected by a control unit 46 comprising a computer, and the rotational speed and torque are respectively controlled.

  An operation unit 48 for operating the control unit 46 is provided.

(2) Operational state of the manufacturing apparatus 10 The manufacturing process of the fiber reinforced sheet 1 shown in FIG. 3 is demonstrated using the manufacturing apparatus 10 demonstrated above.

(2-1) First Step The ring gear 34 is rotated at a constant speed, and the fiber sheet 3 is pulled out from the sheet supply roll 30 with an inclination of θ °.

(2-2) Second Step The ring gear 34 is rotated at a constant speed, and the drawn fiber sheet 3 is folded, for example, at the position of the right folding guide portion 12. In this case, it is folded back so as to adhere to the double-sided adhesive tape 6 protruding from the lower end of the folding guide portion 12. This folding can be done by rotating the ring gear 34 of the layered rotation device 32. When the fiber sheet 3 is folded back, it adheres to both sides of the double-sided adhesive tape 6.

  In addition, what is important here is that the fiber sheet 3 is folded back by the folding guide portion 12, so that even a fiber bundle having a large fineness can be folded. That is, the thick fiber bundle is formed into a sheet by opening, but can be folded along the folding guide portion 12.

(2-3) Third Step While rotating the ring gear 34 at a constant speed and pulling out the fiber sheet 3 folded by the right folding guide section 12 from the sheet supply roll 30, the right folding guide section 12 with an inclination of + θ °. Pull out toward the left folding guide portion 12. Thereby, the first fiber sheet layer 4 can be formed.

(2-4) Fourth Step The ring gear 34 is rotated at a constant speed, and the first fiber sheet layer 4 is folded back by the left folding guide portion 12. By this folding, it is bonded to the left double-sided adhesive tape 6.

(2-5) Fifth Step The ring fiber 34 is rotated at a constant speed, and the folded first fiber sheet layer 4 is moved from the left folding guide portion 12 toward the right folding guide portion 12 by the sheet supply roll 30. The second fiber sheet layer 5 is formed while being pulled out.

(2-6) Sixth Step The ring gear 34 is rotated at a constant speed, and the second fiber sheet layer 5 is folded at the right folding guide portion 12. When the second fiber sheet layer 5 is folded by the right folding guide portion 12, the inside thereof is bonded by the right double-sided adhesive tape 6. And the 1st fiber sheet layer 4 is formed like a 2nd process.

  Similarly, the second to sixth steps are defined as one cycle, and this cycle is repeated to wind the fiber sheet 3 around the pair of folding guide portions 12 in a spiral shape with an inclination of the winding angle θ °. A fiber reinforced sheet 1 as shown is manufactured.

  The manufactured fiber reinforced sheet 1 is collected by the sheet collecting roll 44 while being pulled by the pair of traveling rolls 40 and 42.

  In this manufacturing process, the rotational speed of the laminated rotating device 32 rotated by the rotary speed control motor SM2 is matched with the rotational speed of the rotary speed control motor SM1 for rotating the pair of traveling rolls 40, 42, and the double-sided adhesive tape 16 The torques of the torque control motors TM3 and TM4 for supplying the first and second fiber sheets 18 and 18 need to be matched with the tension pulled by laminating the first fiber sheet layer 4 and the second fiber sheet layer 5, and the sheet collecting roll 44 is caused to travel. The torque of the torque control motor TM2 is adjusted to the rotational speed and tension of the laminated fiber reinforced sheet 1. This adjustment is performed by the control unit 46. And it controls so that there is no slack.

  Specifically, while the laminated sheet 3 rotates once by the rotation of the rotation speed control motor SM2, the rotation of the rotation speed control motor SM1 sends the fiber reinforced sheet 1 by L (winding length for one rotation). To control.

Here, the relationship between the winding length L for one rotation of the lamination rotating device 32 and the width B of the fiber sheet 3 shown in FIG.

L = B / sin θ

And the relationship with the width W of the fiber reinforced sheet 1 is

W = B / (2 × cos θ)

It is.

(Modification of the first embodiment)
In the first embodiment, the sheet supply roll 30 is used to supply the fiber sheet 3 as shown in FIG. 7, but a plurality of bobbins 31 around which the fiber bundles 2 are wound are arranged as shown in FIG. In this case, the fiber sheet 3 may be supplied.

(Second embodiment)
A manufacturing apparatus 100 according to the second embodiment will be described with reference to FIG.

  The difference between the present embodiment and the first embodiment is that the fiber reinforced sheet 1 from the pair of traveling rolls 40 and 42 is further heated and pressurized.

  Specifically, the release films 50 and 52 are disposed on both surfaces of the fiber reinforced sheet 1 and laminated on the fiber reinforced sheet 1 at the pair of traveling rolls 40 and 42.

  A plurality of heating and pressing rolls 54 are pressed and heated from both sides through the laminated release films 50 and 52.

  The both ends 64, 64 of the fiber reinforced sheet 1 on which the double-sided adhesive tapes 6, 6 are present are cut with a pair of cutters 56, 58, and the both ends 64, 64 are cut. The sheet is collected by the sheet collecting roll 44 together with the release films 50 and 52.

  The release films 50 and 52 are supplied by film supply rolls 60 and 62 connected to the torque control motor TM5.

  The cut both ear portions 64 and 64 are collected by the both ear portion collecting rolls 66 and 66. The both ear recovery rolls 66, 66 are rotated by a torque control motor TM7, respectively.

  The fiber reinforced sheet 1 manufactured by the manufacturing apparatus 100 is made of a sealant or a prepreg sheet. Details will be described in the following experimental example.

(Third embodiment)
A manufacturing apparatus 200 according to the third embodiment will be described with reference to FIG.

  In the manufacturing apparatuses 10 and 100 of the first embodiment and the second embodiment, the lamination rotating device 32 is rotated. However, in the manufacturing apparatus 200 of the present embodiment, the sheet supply roll 30 is inclined by θ °. The pair of folding guide portions 12 and 12, the pair of traveling rolls 40 and 42, and the sheet collection roll 44 are provided on a disk-shaped disk gear 68, and the disk gear 68 is rotated by the rotation speed control motor SM2. Thus, the fiber reinforced sheet 1 is manufactured by rotating relative to the sheet supply roll 30.

(Fourth embodiment)
In the first to third embodiments, the fiber reinforced sheet 1 is manufactured by folding the single fiber sheet 1 to form the first fiber sheet layer 4 and the second fiber sheet layer 5. In the example, as shown in FIG. 11, the first fiber sheet layer 4 and the second fiber sheet layer 5 are formed while the two fiber sheets 3-1 and 3-2 are alternately folded back and forth, and the fiber reinforcing sheet 1. Manufacturing.

In this case, the winding length L for one rotation is

L = (B1 + B2) / sin θ

The width W of the fiber reinforced sheet 1 is

(B1 + B2) / (2 × cos θ)

It becomes.

  B1 is the width of the first fiber sheet 3-1, and B2 is the width of the second fiber sheet 3-2.

(Fifth embodiment)
In the fourth embodiment, a structure in which the two fiber sheets 3-1 and 3-2 are alternately folded and wound alternately is shown. However, the present invention is not limited to this, and the fiber reinforced sheet 1 is formed by sequentially folding three or more fiber sheets 3. May be manufactured.

  FIG. 12 is a schematic view when the fiber reinforced sheet 1 is manufactured using the four fiber sheets 3-1, 3-2, 3-3, 3-4.

  FIG. 13 shows a schematic diagram when the four fiber sheets 3 are wound, and FIG. 13 is a diagram schematically illustrating the manufacturing apparatus 10 from the upper surface. That is, it is a view of the XY plane.

  Four sheet supply rolls 30 exist around the pair of folding guide portions 12 and 12 and are arranged at 45 ° intervals. And the fiber reinforced sheet 1 as shown in FIG. 12 can be manufactured by rotating these four sheet supply rolls 30 around the pair of folding guide portions 12 and 12 in order at the same rotational speed. .

Here, the width W of the fiber reinforced sheet 1 when n fiber sheets 3 are used and the length L of the fiber reinforced sheet 1 manufactured in one cycle can be expressed as follows.

  Bk means the k-th (1 = <k = <n) width of the fiber sheet 1, and θ is the winding angle.

(Experimental example)
Hereinafter, the case where the fiber reinforced sheet 1 is experimentally manufactured using the manufacturing apparatuses 10 and 100 of each Example described above will be described in order.

(1) Experimental example 1
(1-1) Experimental conditions A fiber obtained by continuously opening a carbon fiber bundle 12K (Pyrofil TR50S, manufactured by Mitsubishi Rayon Co., Ltd.) as a reinforcing fiber bundle to a width of 20 mm by the method described in Japanese Patent No. 3064019. A unidirectional sheet having a weight of 40 g / m ^{2 and} a width of 460 mm was prepared by arranging 23 bundles in the width direction, and this was used as a fiber sheet.

  The manufacturing apparatus 10 of the first example was used.

  The winding angle θ ° was set to 45 °, and an attempt was made to create a fiber reinforced sheet having a width of 325 mm and a direction of ± 45 °. A double-sided adhesive tape with a width of 18 mm was used.

  While the fiber sheet was rotated once, the fiber reinforced sheet of about 650 mm in the ± 45 ° direction was set to be wound. The time for one rotation of the fiber sheet was 10 seconds (the processing speed was set to about 3.9 m / min).

  When the manufactured fiber reinforced sheet in the direction of ± 45 ° was wound, it was wound up with a release paper having a width of 400 mm (a release paper supply device is not shown) so that the quality of the product was not impaired.

(1-2) Experimental Results A fiber reinforced sheet having a width of 325 mm and a direction of ± 45 ° was produced by about 30 m.

  In the state where each fiber bundle was in tension, there was no sagging as a fiber bundle.

  Since both ends of the fiber reinforced sheet are fixed with a double-sided adhesive tape, and the fiber reinforced sheet is wound together with the release paper, there is no dispersion of the fiber bundle and the shape stability as a fiber reinforced sheet is also good. It was.

  There were almost no gaps between the fiber bundles, and the quality was good.

(2) Experimental example 2
(2-1) Experimental conditions A unidirectionally strengthened prepreg sheet (manufactured by Mitsubishi Rayon Co., Ltd.) was used as the fiber sheet. This prepreg sheet has carbon fiber bundles (Pyrofil TR50S, manufactured by Mitsubishi Rayon Co., Ltd.) arranged in one direction and impregnated with an epoxy resin. The specifications of the prepreg sheet are a carbon fiber bundle basis weight of 54 g / m ² , a resin amount (wt) of 37.5%, and a thickness of 0.057 mm.

  What cut this prepreg sheet into width 554mm was used as a fiber sheet.

  The manufacturing apparatus 10 of the first example was used.

  The winding angle θ ° was set to 30 °, and an attempt was made to create a fiber reinforced sheet having a width of 320 mm and a direction of ± 30 °. A double-sided adhesive tape having a width of 18 mm was used.

  While the fiber sheet was rotated once, the fiber reinforced sheet of about 1108 mm in the ± 30 ° direction was set to be wound.

  The time for one rotation of the fiber sheet was 20 seconds (the processing speed was set to about 3.32 m / min).

  When the produced fiber reinforced sheet in the direction of ± 30 ° was wound, it was wound up with a release paper having a width of 400 mm (a release paper supply device is not shown) so that the quality of the product was not impaired.

(2-2) Experimental results A fiber reinforced sheet having a width of 320 mm and a direction of ± 30 ° was produced by about 10 m.

  There was no sagging or wrinkle on the prepreg sheet.

  Since the prepreg sheet has tackiness, the prepreg sheet in the + 30 ° direction and the prepreg sheet in the −30 ° direction were bonded to each other by the pressure applied by the traveling roll. That is, not only the both ears of the fiber reinforced sheet are fixed with the double-sided adhesive tape, but also the prepreg sheet in the + 30 ° direction and the entire prepreg sheet sheet in the −30 ° direction are bonded to form an integrated fiber reinforced sheet. .

  There was almost no gap between prepreg sheets (fiber sheets), and the quality was good.

(3) Experimental example 3
(3-1) Experimental conditions A fiber bundle obtained by continuously opening a carbon fiber bundle 12K (Pyrofil TR50S, manufactured by Mitsubishi Rayon Co., Ltd.) as a reinforcing fiber bundle to a width of 20 mm by the method described in Japanese Patent No. 3064019. A unidirectional sheet having a basis weight of 40 g / m ^{2 and} a width of 300 mm was prepared by arranging 15 pieces in the width direction.

  As the thermoplastic resin, a nylon 6 resin film (Emblem ON-15, width 320 mm, thickness 15 μm, manufactured by Unitika Ltd.) was used.

  A unidirectional fiber sheet and a thermoplastic resin film are arranged in five layers of a resin film, a unidirectional fiber sheet, a resin film, a unidirectional fiber sheet, and a resin film in order from the bottom, and this sheet is continuously heated. A thermoplastic resin prepreg sheet having a thickness of about 0.093 mm and a Vf (fiber volume content) of about 50% was prepared.

  This thermoplastic prepreg sheet was cut into a width of 226 mm to obtain a fiber sheet. Two fiber sheets were prepared.

  The method of the fourth example was used. That is, two fiber sheets were prepared by arranging them diagonally as shown in FIG.

  The winding angle θ ° was set to 45 °, and an attempt was made to create a fiber reinforced sheet with a width of 320 mm in the ± 45 ° direction.

  A double-sided adhesive tape having a width of 18 mm was used.

  While the fiber sheet was rotated once, it was set to wind up a fiber reinforced sheet of about 640 mm in the ± 45 ° direction. The time for one rotation of the fiber sheet was 20 seconds (the processing speed was set to about 1.92 m / min).

  Release film having a width of 400 mm when winding the manufactured fiber reinforced sheet in the direction of ± 45 ° (glass cloth reinforced fluorine sheet: Chuko Flow G type fabric, FGF-500-4, width 400 mm, thickness 0.1 mm, Chuko Take-up with Kasei Kogyo Co., Ltd. (release paper feeder is not shown) so that the quality of the product is not impaired.

(3-2) Experimental results A fiber reinforced sheet having a width of 320 mm and a direction of ± 45 ° was produced by about 20 m.

  There was no sagging or wrinkle on the prepreg sheet.

  Since both ear portions of the fiber reinforced sheet were fixed with a double-sided adhesive tape, and the fiber reinforced sheet was wound together with the release film, the form stability as the fiber reinforced sheet was also good.

  There were almost no gaps between the fiber sheets, and the quality was good.

(4) Experimental example 4
(4-1) Experimental conditions A method of pressurizing the fiber reinforced sheets in the ± 45 ° direction by the thermoplastic resin prepreg sheet prepared in Experimental Example 3 while heating was performed. That is, the manufacturing apparatus of the second embodiment was used.

  Pull out the fiber reinforced sheet in the ± 45 ° direction together with the release film (with the fiber reinforced sheet in the ± θ ° direction on the release film), and its upper surface, that is, the fiber reinforced sheet in the ± 45 ° direction. A release film (same as that used in Experimental Example 3) is superimposed on the upper side of the film. Then, while heating the fiber reinforced sheet in the direction of ± 45 ° sandwiched between the pair of release films to about 250 ° C. with a roll-type heating and pressurizing device (see the manufacturing apparatus 100 of the second embodiment). The pressurizing process was performed.

  And both ear | edge parts were cut about 25 mm at a time, the release film was peeled, and the fiber reinforcement sheet | seat of +/- 45 degrees direction was wound up about 10m.

(4-2) Experimental result A fiber reinforced sheet having a width of 270 mm and a direction of ± 45 ° was obtained.

  There was no sagging or wrinkle on the prepreg sheet.

  The fiber sheet in the + 45 ° direction and the fiber sheet in the −45 ° direction were bonded to form an integrated fiber reinforced sheet.

  There was almost no gap between prepreg sheets (fiber sheets), and the quality was good.

It is a top view of the fiber reinforcement sheet which shows one Example of this invention. It is a longitudinal cross-sectional view of a fiber reinforced sheet similarly. It is a top view of the fiber reinforced sheet manufactured with the manufacturing apparatus of a 1st Example. It is a perspective view of the manufacturing apparatus of a 1st Example. It is a figure of a folding | returning part, (a) is a side view, (b) is a front view. It is a block diagram of the manufacturing apparatus of a 1st Example. It is a top view of a sheet supply roll. It is explanatory drawing of the state which arranged the bobbin in multiple numbers. It is a perspective view of the manufacturing apparatus of a 2nd Example. It is a perspective view of the manufacturing apparatus of a 3rd Example. It is a top view of the fiber reinforced sheet of the 4th example. It is the schematic of the fiber reinforcement sheet | seat using four fiber sheets. It is the schematic seen from the upper surface of the manufacturing apparatus in a 4th Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fiber reinforcement sheet 2 Fiber bundle 3 Fiber sheet 4 1st fiber sheet layer 5 2nd fiber sheet layer 6 Double-sided adhesive tape 10 Manufacturing apparatus 12 Folding guide part 14 Hollow part 16, 18 Double-sided adhesive tape 24, 26 Release paper 28 Release paper Collection roll 30 Sheet supply roll 32 Stacking rotation device 34 Ring gear 36 Arm member 38 Gear 40, 42 Traveling roll 44 Sheet collection roll

Claims (10)

A fiber reinforced sheet,
At least one fiber sheet in which fiber bundles are aligned in one direction with respect to the longitudinal direction of the fiber reinforced sheet has an inclination of a predetermined angle θ ° (where 0 ° <θ ° <90 °). Folded in order to overlap and wound the fiber sheet spirally,
The first fiber sheet layer having a fiber sheet direction of + θ ° with respect to the longitudinal direction and the second fiber sheet layer having a fiber sheet direction of −θ ° with respect to the longitudinal direction. Characteristic fiber reinforced sheet. The fiber reinforced sheet according to claim 1, wherein the first fiber sheet layer and the second fiber sheet layer are in close contact. The fiber reinforcement according to claim 1 or 2, wherein the first fiber sheet layer and the second fiber sheet layer located at both ears of the fiber reinforcement sheet are bonded and fixed by an adhesive. Sheet. The fiber bundle constituting the fiber sheet is
The fiber-reinforced sheet according to at least one of claims 1 to 3, wherein the fiber-reinforced sheet is a spread yarn which is a fiber bundle continuously opened in a wide and thin state. The fiber sheet is
The fiber-reinforced sheet according to at least one of claims 1 to 4, wherein the fiber-reinforced sheet is made of a heat-bonding yarn or a fiber bundle to which a sealing agent is attached. The fiber sheet is
The fiber reinforced sheet according to at least one of claims 1 to 4, wherein the fiber reinforced sheet is a prepreg sheet impregnated with a thermoplastic resin. The fiber sheet is
The fiber-reinforced sheet according to at least one of claims 1 to 4, wherein the fiber-reinforced sheet is a prepreg sheet impregnated with a thermosetting resin. The first fiber sheet layer and the second fiber sheet layer are
The fiber reinforced sheet according to at least one of claims 5 to 7, wherein the fiber reinforced sheet is bonded by pressure treatment or pressure treatment while heating. The fiber-reinforced sheet according to claim 1, wherein 15 ° = <θ ° = <75 °. The fiber reinforced sheet according to at least one of claims 1 to 9, wherein a plurality of the fiber sheets are folded in a state of being arranged.

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