JP2006130698A - Multi-axial laminated reinforcing fiber sheet, its manufacturing method and long inclined reinforcing fiber sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a multi-axial laminated reinforcing fiber sheet capable of continuously manufacturing the multi-axial laminated reinforcing fiber sheet by a more simple method. <P>SOLUTION: Reinforcing fiber bundles, each of which is opened and widened so that a width per 1,000 single yarns becomes 1.3 mm or above, are bonded and integrated to manufacture a reinforcing fiber sheet having a predetermined angle of orientation and an inclined reinforcing fiber sheet having an angle θ(-90°<θ<0°, 0°<θ<90°) orientation different from that of the reinforcing fiber sheet is manufactured using the reinforcing fiber sheet. At least two kinds of sheets different in angle of orientation are selected from the manufactured inclined reinforcing fiber sheet, the reinforcing fiber sheet and a reinforcing fiber tape, which is formed by arranging a plurality of the opened and widened reinforcing fiber bundles in parallel to each other to arrange them in a planar state, and laminated, bonded and integrated to manufacture the multi-axial laminated reinforcing fiber sheet. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a multiaxial laminated reinforcing fiber sheet for a composite material, and in particular, a multiaxial laminated reinforcing fiber sheet manufacturing method for continuously producing a multiaxial laminated reinforcing fiber sheet for a composite material from a reinforcing fiber sheet, and a multiaxial The present invention relates to a laminated reinforcing fiber sheet.

BACKGROUND ART Composite materials using reinforcing fibers such as carbon fibers as reinforcing materials have been widely used for aerospace and the like that are conventionally lightweight and require high mechanical performance.
Normally, when reinforcing fibers are used as a composite material, they are used in the state of a uniaxial reinforcing tape in which a large number of reinforcing fibers are arranged in one direction, or a uniaxial reinforcing sheet bonded and integrated with reinforcing fibers or yarns. Yes. And, in particular, when it is desired to obtain in-plane pseudoisotropy, generally, a method of producing a multiaxial laminated sheet by laminating uniaxial reinforcing tapes oriented at various angles has been taken, of which As a simple one, there is a biaxial reinforced fabric in which the spread fiber bundles are arranged in two orthogonal axes, which are insufficient as in-plane pseudoisotropy.

  In the composite material using the reinforcing fiber as a reinforcing material as described above, particularly when a high level of lightness is required, the reinforcing fiber is reinforced with ultrafine materials such as 1K (K means 1000 single yarns). Ultrathin tapes and fabrics obtained from fiber bundles are often used.

However, since the ultrafine reinforcing fiber bundle is extremely expensive, at present, in terms of cost, the applications that can realize the production of composite materials using the ultrafine reinforcing fiber are extremely limited. .
In order to solve this problem, it is conventionally known to widen a bundle of reinforcing fibers that are usually thick or relatively thick by air opening (see Non-Patent Document 1), and the reinforcement that has been opened A dry ultra-thin tape or fabric obtained from a fiber bundle is also known (see Non-Patent Document 2). Here, “dry” means a state in which a tape or fabric produced from reinforcing fibers is not impregnated with a matrix resin.

  If a tape or woven fabric is produced using the reinforcing fiber bundle thus opened, it is considerably thinner than a tape or woven fabric using a reinforcing fiber bundle that is usually thick or relatively thick. Tape and woven reinforcements can be obtained, and as a result, highly lightweight composite materials can be provided at a fairly low cost.

And as the reinforcing material of the composite material, a multiaxial laminated reinforcing fiber sheet in which the opened reinforcing fiber bundles are oriented and laminated at various angles is more desirable, but this opened reinforcing fiber bundle was used. A method and apparatus for producing a multiaxial laminated reinforcing fiber sheet has not been established.
Of course, there have been machines for producing multiaxial laminated sheets using reinforcing fibers such as carbon fibers that have not been opened, and LIBA and MAYER warp knitted systems are well known.

Hereinafter, a method for producing a multiaxial laminated reinforcing fiber sheet using a warp knitted Russell system will be described.
FIG. 12 is a diagram showing a warp knitting Russell system. In a conventional warp knitting Russell system 1100, three standard weft insertion machines 1102 are installed on a fiber orientation machine 1101 having a width of 6 m and a length of about 20 to 30 m. The reinforcing fiber yarns of the fiber orientation machine 1101 are inserted in the guide portion 1103 so that the inserted yarns are not scattered at the same time as the reinforced fiber yarns are simultaneously inserted in the direction of 90 ° or angled (45 °, −45 °, etc.). The fiber orientation of each layer is performed while holding the ends. Then, while maintaining the state, the three-layer sheet is moved to the final stitching unit 1104 of the fiber orientation machine 1101, and each layer is held with the stitching yarn in the Z-axis direction, and then the winding unit At 1105, it is wound up.
Therefore, it is also conceivable to produce a multiaxial laminated reinforcing sheet from the opened reinforcing fiber bundle using this conventional system.
Kawabe, Tomoda and Matsuo: Textile Machinery Journal 50 T68 (1997) Tomoda, Kawabe, Matsuo: Materials 49 1023 (2000)

  However, this warp knitting Russell system 1100 has a very expensive mechanical device, requires a large amount of installation space, and requires a large amount of raw materials and personnel for setting a weft to the weft insertion machine 1102. There were problems such as. Further, in the warp knitted Russell system 1100, since the raw yarn is directly inserted from the weft insertion machine 1102, there is a problem that the density of the fiber density, the defect, the orientation unevenness and the like are likely to occur in the product. The problem is that, in high-weight, thick-layer products using unopened reinforcing fibers, although superior in terms of productivity, low-weight, thin-layer using opened reinforcing fibers For products, etc., very delicate management is required at the time of supplying the raw yarn. Using such a warp knitted Russell system 1100, a multiaxial laminated sheet of reinforced fibers that has been opened can be obtained with high quality. Is considered difficult.

  The present invention has been made in view of the above problems, and a multiaxial laminated reinforcing fiber sheet production method capable of continuously producing a multiaxial laminated reinforcing fiber sheet of opened reinforcing fibers by a simpler method, And it aims at providing a multiaxial lamination reinforcement fiber sheet.

In order to solve the above-mentioned problem, the multiaxial laminated reinforcing fiber sheet manufacturing method according to claim 1 of the present invention is a fiber-opening widening of a reinforcing fiber single yarn bundle so that the width per 1000 fibers is 1.3 mm or more. And a reinforcing fiber sheet preparation step for producing a reinforcing fiber sheet having a predetermined orientation angle by combining and unifying a plurality of the spread fiber reinforcing fibers bundles, and the reinforcing fiber sheet. An inclined reinforcing fiber sheet producing step of producing at least one or more kinds of inclined reinforcing fiber sheets having different orientation angles using the reinforcing fiber sheet; and the inclined reinforcing fiber sheet produced in the inclined reinforcing fiber sheet producing step; In the reinforcing fiber sheet produced in the reinforcing fiber sheet production step, two or more types having different orientation angles are selected, and the selected orientation angles are different. And integrally bonded steps of integrally bonding by laminating over bets, it is intended to include.
Thereby, a multiaxial lamination reinforcement fiber sheet can be obtained more easily using the conventional apparatus.

Further, in the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 2 of the present invention, an opening and widening step of opening and widening a reinforcing fiber single yarn bundle so that a width per 1000 fibers is 1.3 mm or more; A reinforcing fiber sheet producing step of producing a reinforcing fiber sheet having a predetermined orientation angle by combining and unifying a plurality of spread fiber bundles that have been spread and spread, and at least an orientation angle different from that of the reinforcing fiber sheet One or more types of inclined reinforcing fiber sheets are prepared by using the reinforcing fiber sheet, and the inclined reinforcing fiber sheet manufacturing step and a plurality of the spread fiber reinforcing fibers bundles are aligned in parallel and arranged in a plane. A reinforcing fiber tape manufacturing step for manufacturing a reinforcing fiber tape, the inclined reinforcing fiber sheet manufactured in the inclined reinforcing fiber sheet manufacturing step, and the reinforcing fiber sheet manufacturing step From the produced reinforcing fiber sheet or the reinforcing fiber tape produced in the reinforcing fiber tape production step, two or more kinds having different orientation angles are selected, and the selected sheets or tapes having different orientation angles are laminated. Joining integration step of joining and integrating.
Thereby, a multiaxial lamination reinforcement fiber sheet can be obtained more easily using the conventional apparatus.

Moreover, the multiaxial laminated reinforcing fiber sheet producing method according to claim 3 of the present invention is the multiaxial laminated reinforcing fiber sheet producing method according to claim 1 or 2, wherein the inclined reinforcing fiber sheet producing step comprises: A joining step for joining the opposing side ends of the reinforcing fiber sheet into a cylindrical shape, and a reinforcing fiber sheet joined in the cylindrical shape with a predetermined angle with respect to the axial direction of the cylindrical reinforcing fiber sheet and an inclined cutting step for continuously inclined cutting at θ (−90 ° <θ <0 °, 0 ° <θ <90 °).
Thereby, the long inclination reinforcement fiber sheet orientated by the predetermined angle (theta) can be produced in a simple process, As a result, it becomes possible to produce a multiaxial lamination reinforcement fiber sheet using a conventional apparatus.

Moreover, the multiaxial laminated reinforcing fiber sheet producing method according to claim 4 of the present invention is the multiaxial laminated reinforcing fiber sheet producing method according to claim 1, wherein the inclined reinforcing fiber sheet producing step comprises the reinforcing fiber sheet. And a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis, and the angle θ and the slope reinforcing fiber sheet are integrally joined in the joining and integration step. A width determined by the width of the sheet to be converted, a slant cutting step for slant cutting the reinforcing fiber sheet, and a joining step for joining while joining the end portions of the plurality of slant reinforcing fiber sheets obtained by the slant cutting, Is included.
Thereby, the long inclination reinforcement fiber sheet orientated by the predetermined angle (theta) can be produced in a simple process, As a result, it becomes possible to produce a multiaxial lamination reinforcement fiber sheet using a conventional apparatus.

Moreover, the multiaxial laminated reinforcing fiber sheet producing method according to claim 5 of the present invention is the multiaxial laminated reinforcing fiber sheet producing method according to claim 2, wherein the inclined reinforcing fiber sheet producing step comprises the reinforcing fiber sheet. And a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis, and the angle θ and the slope reinforcing fiber sheet are integrally joined in the joining and integration step. A step of inclining and cutting the reinforcing fiber sheet at a width determined by the width of the sheet or tape to be converted, and a joining step of joining the end portions of the plurality of inclined reinforcing fiber sheets obtained by the inclining cutting while joining them And.
Thereby, the long inclination reinforcement fiber sheet orientated by the predetermined angle (theta) can be produced in a simple process, As a result, it becomes possible to produce a multiaxial lamination reinforcement fiber sheet using a conventional apparatus.

The method for producing a multiaxial laminated reinforcing fiber sheet according to claim 6 of the present invention is the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 1, wherein the step of producing the inclined reinforcing fiber sheet comprises the reinforcing fiber sheet. Width determined by a predetermined angle (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis and the sheet width to be surface-bonded to the inclined reinforcing fiber sheet. The inclined cutting step for cutting the reinforcing fiber sheet in an inclined manner, and the plurality of inclined reinforcing fiber sheets obtained by the inclined cutting, the reinforcing fiber sheet or the plurality of spread fiber reinforced fiber bundles in parallel. A joining step of joining the end portions of the sloped reinforcing fiber sheet while surface joining to the reinforcing fiber tapes that are aligned and arranged in a plane.
Thereby, the long inclination reinforcement fiber sheet orientated by the predetermined angle (theta) can be produced by a simpler process, As a result, it becomes possible to produce a multiaxial lamination reinforcement fiber sheet using a conventional apparatus.

Moreover, the multiaxial laminated reinforcing fiber sheet manufacturing method according to claim 7 of the present invention is the multiaxial laminated reinforcing fiber sheet manufacturing method according to claim 2, wherein the inclined reinforcing fiber sheet manufacturing step includes the reinforcing fiber sheet. And a predetermined angle (−90 ° <θ <0 °, 0 ° <θ <90 °), and the angle θ and the width of the sheet or tape to be surface-bonded to the inclined reinforcing fiber sheet An inclined cutting step for inclinedly cutting the reinforcing fiber sheet with a width determined by the step, and a plurality of inclined reinforcing fiber sheets obtained by the inclined cutting, the reinforcing fiber sheet or a plurality of the spread fiber-reinforced reinforcing fiber bundles. A step of joining the end portions of the sloped reinforcing fiber sheet to each other while surface-bonding them to the reinforcing fiber tape arranged in a plane by aligning them in parallel.
Thereby, the long inclination reinforcement fiber sheet orientated by the predetermined angle (theta) can be produced by a simpler process, As a result, it becomes possible to produce a multiaxial lamination reinforcement fiber sheet using a conventional apparatus.

The multiaxial laminated reinforcing fiber sheet production method according to claim 8 of the present invention is the multiaxial laminated reinforcing fiber sheet production method according to claim 1 or 2, wherein the reinforcing fiber sheet is the spread fiber. This is a uniaxially oriented reinforcing fiber sheet in which widened reinforcing fiber bundles are bonded and integrated using yarns.
Thereby, since the reinforcing fiber bundle opened by the yarn is fixed, it is possible to obtain an easy-to-handle uniaxial reinforcing fiber sheet having almost no irregularities on its surface.

The multiaxial laminated reinforcing fiber sheet production method according to claim 9 of the present invention is the multiaxial laminated reinforcing fiber sheet production method according to claim 8, wherein the yarn has an adhesive function.
Thereby, it is possible to further prevent the reinforcing fiber bundle that has been spread and expanded from moving in the width direction and losing its shape, and to obtain a uniaxial reinforcing fiber sheet excellent in handleability.

The multiaxial laminated reinforcing fiber sheet production method according to claim 10 of the present invention is the multiaxial laminated reinforcing fiber sheet production method according to claim 1 or 2, wherein the reinforcing fiber sheet comprises a plurality of reinforcing fiber sheets. A uniaxially oriented reinforcing fiber sheet in which an adhesive fiber web is joined to a reinforcing fiber tape in which the reinforcing fiber bundles that have been widened and spread are arranged into a sheet, and the reinforcing fiber bundles that have been widened and spread are joined and integrated. It is.
Thereby, since the reinforcing fiber bundles are bonded and integrated by the adhesive fiber web, it is possible to prevent the expanded reinforcing fiber bundle from moving in the width direction and losing its shape, and having excellent handleability. A uniaxial reinforcing fiber sheet is obtained.

Further, the multiaxial laminated reinforcing fiber sheet production method according to claim 11 of the present invention is the multiaxial laminated reinforcing fiber sheet production method according to claim 1 or 2, wherein the reinforcing fiber sheet is the spread fiber. This is a biaxially oriented reinforcing fiber sheet obtained by weaving or knitting a widened reinforcing fiber bundle and integrating them.
Thereby, the multiaxial lamination | stacking reinforcement fiber sheet which used the biaxially-oriented reinforcement fiber sheet as one constituent sheet using the conventional apparatus can be obtained easily.

A multiaxial laminated reinforcing fiber sheet production method according to claim 12 of the present invention is the multiaxial laminated reinforcing fiber sheet production method according to claim 1 or 2, wherein the surface of the reinforcing fiber sheet is weighted. A porous adhesive layer of 10 g / m ² or less is bonded.
Thereby, it is possible to obtain a reinforced fiber sheet excellent in handleability, which can more reliably prevent the reinforced fiber bundle that has been spread and expanded in the width direction from being deformed. In addition, a molded product using the reinforcing fiber sheet as a reinforcing material can be made ultra-light, and high mechanical performance can be maintained.

A multiaxial laminated reinforcing fiber sheet production method according to claim 13 of the present invention is the multiaxial laminated reinforcing fiber sheet production method according to claim 2, wherein the basis weight of the reinforcing fiber tape is 10 g / m ^2. The following porous adhesive layers are joined.
Thereby, it is possible to obtain a reinforced fiber tape excellent in handleability, which can more reliably prevent the reinforced fiber bundle that has been spread and widened from moving in the width direction and being deformed. In addition, a molded product using the reinforcing fiber sheet as a reinforcing material can be made ultra-light, and high mechanical performance can be maintained.

Moreover, the multiaxial laminated reinforcing fiber sheet production method according to claim 14 of the present invention is the multiaxial laminated reinforcing fiber sheet production method according to claim 1 or 2, wherein the reinforcing fiber sheet production step includes the step of After bonding a porous adhesive layer having a basis weight of 10 g / m ² or less to the surface of the reinforcing fiber bundle that has been spread and spread, the reinforcing fiber bundle to which the porous adhesive layer is bonded is joined and integrated. .
Thereby, it can make it easy to produce a reinforced fiber sheet.

  Moreover, the multiaxial laminated reinforcing fiber sheet production method according to claim 15 of the present invention is the multiaxial laminated reinforcing fiber sheet production method according to claim 1 or 2, wherein the joining and integrating step is porous. Bonding and integration are performed using an adhesive.

The multiaxial laminated reinforcing fiber sheet production method according to claim 16 of the present invention is the multiaxial laminated reinforcing fiber sheet production method according to claim 1 or 2, wherein the joining and integrating step includes stitching. Are joined and integrated.
Thereby, the component sheet | seat of a multiaxial lamination reinforcing fiber sheet can be joined and integrated using the conventional apparatus.

In addition, the multiaxial laminated reinforcing fiber sheet manufacturing method according to claim 17 of the present invention is the multiaxial laminated reinforcing fiber sheet manufacturing method according to claim 1 or 2, wherein the joining and integrating step includes joining and integrating. When forming, a matrix layer is included between the laminated layers.
Thereby, a composite material molded product can be molded more easily and efficiently from a multiaxial laminated reinforcing fiber sheet.

The multiaxial laminated reinforcing fiber sheet production method according to claim 18 of the present invention is the multiaxial laminated reinforcing fiber sheet production method according to claim 17, wherein the matrix layer is made of a thermoplastic resin or a thermoplastic resin. It consists of a fiber web.
Thereby, when producing a multiaxial laminated reinforcing fiber sheet using reinforcing fibers as a constituent sheet, it is possible to prevent a problem that air contained in the multiaxial laminated reinforcing fiber sheet is difficult to escape.

  Moreover, the multiaxial laminated reinforcing fiber sheet production method according to claim 19 of the present invention is the multiaxial laminated reinforcing fiber sheet production method according to claim 1 or 2, wherein the reinforcing fiber sheet production step comprises the steps of: When producing a reinforcing fiber sheet, the reinforcing fiber sheet is impregnated with a matrix resin.

Moreover, the multiaxial laminated reinforcing fiber sheet producing method according to claim 20 of the present invention is the multiaxial laminated reinforcing fiber sheet producing method according to claim 2, wherein the reinforcing fiber tape producing step uses the reinforcing fiber tape. In production, the reinforcing fiber tape is impregnated with a matrix resin.
Thereby, a composite material molded product can be molded more easily and efficiently from a multiaxial laminated reinforcing fiber sheet.

Further, in the long inclined reinforcing fiber sheet according to claim 21 of the present invention, a plurality of reinforcing fiber bundles that are spread and widened so that the width per 1000 single yarns is 1.3 mm or more are combined and integrated. A reinforcing fiber sheet having a predetermined orientation angle is prepared, and the reinforcing fiber sheet formed into a cylindrical shape by joining opposite side ends of the reinforcing fiber sheet is formed at a predetermined angle with respect to the axial direction of the cylinder. It is formed by continuous inclined cutting at θ (−90 ° <θ <0 °, 0 ° <θ <90 °).
As a result, a long and slanted reinforcing fiber sheet oriented at a predetermined predetermined θ degree can be produced more easily.

In the long inclined reinforcing fiber sheet according to claim 22 of the present invention, a plurality of reinforcing fiber bundles that are spread and widened so that the width per 1000 single yarns is 1.3 mm or more are combined and integrated. To prepare a reinforcing fiber sheet having a predetermined orientation angle, and the reinforcing fiber sheet has a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis. And the angle θ and the width determined by the sheet width for joining and integrating the sloped reinforcing fiber sheets, while being inclined and cut, and joining each end of a plurality of sloped reinforcing fiber sheets obtained by the inclined cutting Concatenated.
As a result, a long and slanted reinforcing fiber sheet oriented at a predetermined predetermined θ degree can be produced more easily.

Further, the long inclined reinforcing fiber sheet oriented at θ degrees according to claim 23 of the present invention is a plurality of fibers that are spread and widened so that the width per 1000 single yarns is 1.3 mm or more. A reinforcing fiber bundle is bonded and integrated to produce a reinforcing fiber sheet having a predetermined orientation angle, and the reinforcing fiber sheet has a predetermined angle θ (−90 ° <θ <0 °, 0 ° with respect to the orientation axis). <Θ <90 °), and a plurality of inclined reinforcing fiber sheets obtained by performing inclined cutting at a width determined by the angle θ and the width of the sheet or tape to be surface-bonded to the inclined reinforcing fiber sheet, and the inclined cutting. The end portions of the sloped reinforcing fiber sheet are connected to the reinforcing fiber sheet or the reinforcing fiber tape in which a plurality of the expanded and widened reinforcing fiber bundles are aligned in parallel and arranged in a plane. It will be.
As a result, a long and slanted reinforcing fiber sheet oriented at a predetermined predetermined θ degree can be produced more easily.

In the multiaxial laminated reinforcing fiber sheet according to claim 24 of the present invention, a plurality of reinforcing fiber bundles that are spread and widened so that the width per 1000 single yarns is 1.3 mm or more are combined and integrated. Then, a reinforcing fiber sheet having a predetermined orientation angle is produced, and the reinforcing fiber sheet formed by joining the opposing side end portions of the reinforcing fiber sheet into a cylindrical shape has a predetermined angle θ ( -90 ° <θ <0 °, 0 ° <θ <90 °), and the slope reinforcing fiber sheet having an orientation angle different from that of the reinforcing fiber sheet was continuously cut by slope cutting. Two or more types having different orientation angles are selected from the inclined reinforcing fiber sheet and the reinforcing fiber sheet, and the selected sheets having different orientation angles are laminated and joined together.
Thereby, a multiaxial lamination reinforcement fiber sheet can be produced more simply and at low cost.

In the multiaxial laminated reinforcing fiber sheet according to claim 25 of the present invention, a plurality of reinforcing fiber bundles that are spread and widened so that the width per 1000 single yarns is 1.3 mm or more are combined and integrated. A reinforcing fiber sheet having a predetermined orientation angle is prepared, and the reinforcing fiber sheet has a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis, and A plurality of inclined reinforcing fiber sheets are produced by being inclined and cut at a width determined by the angle θ and a sheet width to be joined and integrated with the inclined reinforcing fiber sheet, and each end of the plurality of inclined reinforcing fiber sheets obtained by the inclined cutting. The sloped reinforcing fiber sheet having an orientation angle different from that of the reinforcing fiber sheet is produced by joining the parts together, and the orientation angle of the produced sloped reinforcing fiber sheet and the reinforcing fiber sheet are different. Select two or more types and select Different sheet orientation angle laminated those formed by integrally bonding.
Thereby, a multiaxial lamination reinforcement fiber sheet can be produced more simply and at low cost.

In the multiaxial laminated reinforcing fiber sheet according to claim 26 of the present invention, a plurality of reinforcing fiber bundles that are spread and widened so that the width per 1000 single yarns is 1.3 mm or more are combined and integrated. A reinforcing fiber sheet having a predetermined orientation angle is prepared, and the reinforcing fiber sheet has a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis, and A plurality of inclined reinforcing fiber sheets are produced by inclining and cutting at a width determined by the angle θ and the width of a sheet or tape to be surface-bonded to the plurality of inclined reinforcing fiber sheets. The reinforcing fiber sheet, or the sheet in which a plurality of the expanded and widened reinforcing fiber bundles are aligned in parallel and arranged in a plane, and are surface-bonded, and the inclined reinforcing fiber sheet is surface-bonded or Tape and said reinforcing fiber sheet Of the, select two or more different orientation angles, in which by laminating different sheet orientation angle obtained by the selected formed by integrally bonding.
Thereby, a multiaxial lamination reinforcement fiber sheet can be produced more simply and at low cost.

  According to the method for producing a multiaxial laminated reinforcing fiber sheet of the present invention, a reinforcing fiber sheet having a predetermined orientation angle is produced from a reinforcing fiber bundle that has been spread and widened, and at least one having an orientation angle different from that of the reinforcing fiber sheet. More than one type of inclined reinforcing fiber sheet was produced using the reinforcing fiber sheet, and the produced inclined reinforcing fiber sheet and the reinforcing fiber sheet or a plurality of reinforcing fiber bundles that were spread and expanded were formed into a sheet shape. Since at least two types with different orientation angles are selected from the reinforcing fiber tape and laminated and joined together to obtain a multiaxial laminated reinforcing fiber sheet, without introducing a new machine, Using this apparatus, a multiaxial laminated reinforcing fiber sheet can be produced.

  In addition, according to the method for producing a multiaxial laminated reinforcing fiber sheet of the present invention, each constituent sheet constituting the multiaxial laminated reinforcing fiber sheet is separately prepared in advance, and the constituent sheets are laminated and integrated. Since the multiaxial laminated reinforcing fiber sheet is produced, the multiaxial laminated reinforcing fiber sheet can be produced more easily and at low cost. It is also possible to easily add a thermosetting resin as a matrix or a fiber web of thermoplastic resin as the constituent sheet. And the composite material which made the reinforcement material the multiaxial lamination | stacking reinforcement fiber sheet which added the fiber web of the said thermosetting resin or a thermoplastic resin as a structure sheet | seat can be shape | molded easily.

  Further, according to the method for producing a multiaxial laminated reinforcing fiber sheet of the present invention, the inclined reinforcing fiber sheet is formed into a cylindrical shape by joining opposite side end portions of the reinforcing fiber sheet, and the reinforcing fiber sheet is formed into the cylindrical shape. Is obtained by continuously inclined cutting at a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the axial direction of the cylindrical reinforcing fiber sheet. Therefore, it is possible to obtain an inclined reinforcing fiber sheet that is a constituent sheet of a multiaxial laminated sheet by a simple process.

  In addition, according to the method for producing a multiaxial laminated reinforcing fiber sheet of the present invention, the inclined reinforcing fiber sheet and the reinforcing fiber sheet are given a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90). °) and a width determined by the angle θ and the sheet width to be bonded to the inclined reinforcing fiber sheet surface, and inclined cutting to produce a plurality of inclined reinforcing fiber sheets, and each end of the plurality of inclined reinforcing fiber sheets Since the parts are joined and joined, the sloped reinforcing fiber sheet, which is a constituent sheet of the multiaxial laminated sheet, can be obtained by a simple process.

  In addition, according to the method for producing a multiaxial laminated reinforcing fiber sheet of the present invention, as the constituent sheet constituting the multiaxial laminated reinforcing fiber sheet, a reinforcing fiber bundle that has been spread and widened is used. It can be impregnated quickly and has the effect of being easily molded.

  Further, according to the method for producing a multiaxial laminated reinforcing fiber sheet of the present invention, since the reinforcing fiber tape or the reinforcing fiber sheet is joined with the porous adhesive layer, the handling property of the reinforcing fiber tape or the reinforcing fiber sheet is improved. Can be improved.

  Further, according to the method for producing a multiaxial laminated reinforcing fiber sheet of the present invention, when the constituent sheets of the multiaxial laminated reinforcing fiber sheet are laminated and joined and integrated, a matrix layer is included between the laminated layers. From the multiaxial laminated reinforcing fiber sheet, a composite material molded product can be molded more easily and efficiently.

  Further, according to the method for producing a multiaxial laminated reinforcing fiber sheet of the present invention, when producing the reinforcing fiber sheet, since the reinforcing fiber sheet is impregnated with a matrix resin, from the multiaxial laminated reinforcing fiber sheet, A composite material molded product can be molded more easily and efficiently.

  According to the inclined reinforcing fiber sheet of the present invention, the inclined reinforcing fiber sheet is formed into a cylindrical shape by joining opposite end portions of the reinforcing fiber sheet, and the reinforcing fiber sheet having the cylindrical shape is formed into the cylindrical reinforcing fiber. The sheet is formed by continuous inclined cutting at a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the axial direction of the sheet. An inclined reinforcing fiber sheet can be obtained.

  Further, according to the inclined reinforcing fiber sheet of the present invention, a plurality of reinforcing fiber bundles spread and widened so that the width per 1000 single yarns is 1.3 mm or more are combined and integrated to obtain a predetermined orientation angle. A reinforcing fiber sheet having a cylindrical shape formed by joining opposite side ends of the reinforcing fiber sheet to a predetermined angle θ (−90 ° <θ < 0 °, 0 ° <θ <90 °), continuously inclined and cut to produce an inclined reinforcing fiber sheet having an orientation angle different from that of the reinforcing fiber sheet, and the prepared inclined reinforcing fiber sheet, Since two or more kinds having different orientation degrees are selected from the reinforcing fiber sheets, and the selected sheets having different orientation angles are laminated and joined together, a low-cost multiaxial laminated reinforcing fiber sheet is obtained. Obtainable.

  Further, according to the multiaxial laminated reinforcing fiber sheet of the present invention, a plurality of reinforcing fiber bundles that have been spread and widened so that the width per 1000 single yarns is 1.3 mm or more are combined and integrated to obtain a predetermined orientation. A reinforcing fiber sheet having an angle is prepared, and the reinforcing fiber sheet is set to a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis of the reinforcing fiber sheet, and A plurality of inclined reinforcing fiber sheets are produced by being inclined and cut at a width determined by the angle θ and the sheet width to be bonded to the inclined reinforcing fiber sheet surface, and the end portions of the plurality of inclined reinforcing fiber sheets are bonded together. Since two or more types having different orientation angles are selected from the connected inclined reinforcing fiber sheet and the reinforcing fiber sheet, the selected sheets are stacked and joined and integrated. Obtain cost-effective multiaxial laminated reinforcing fiber sheet Door can be.

  In addition, according to the multiaxial laminated reinforcing fiber sheet of the present invention, a plurality of reinforcing fiber bundles that have been spread and widened so that the width per 1000 single yarns is 1.3 mm or more are combined and integrated to obtain a predetermined A reinforcing fiber sheet having an orientation angle is produced, and the reinforcing fiber sheet is subjected to a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °), the angle θ, and the inclined reinforcing fiber. A plurality of inclined reinforcing fiber sheets are produced by being inclined and cut at a width determined by the width of the sheet or tape to be joined to the sheet surface, and the plurality of inclined reinforcing fiber sheets are reinforced by expanding the reinforcing fiber sheets or by spreading the fibers. Two or more kinds of sheets having different orientation angles among the sheet or tape on which the inclined reinforcing fiber sheet is surface bonded and the reinforcing fiber sheet are surface bonded to a reinforcing fiber tape in which a plurality of fiber bundles are arranged side by side. Selected, Since it is assumed that by laminating a selected sheet formed by integrally bonding, it is possible to obtain a multi-axis laminated reinforcing fiber sheet of low cost.

(Embodiment 1)
Hereinafter, a method for producing the multiaxial laminated reinforcing fiber sheet of the first embodiment will be described.
In the method for producing a multiaxial laminated reinforcing fiber sheet according to the first embodiment, first, a reinforcing fiber sheet having a predetermined orientation angle is produced by combining and unifying the reinforcing fiber bundles that have been spread and widened, and the produced reinforcing fiber. From the sheet, an inclined reinforcing fiber sheet having an orientation angle different from that of the reinforcing fiber sheet is produced. And at least two types having different orientation angles among the prepared gradient reinforcing fiber sheet and the reinforcing fiber sheet or the reinforcing fiber tape in which the reinforcing fiber bundles that have been spread and widened are aligned in parallel and arranged in a planar shape. A multiaxial laminated reinforcing fiber sheet is obtained by selecting, laminating them using a conventional apparatus, and joining and integrating them.

FIG. 1 is a flowchart showing a series of flows for producing a multiaxial laminated reinforcing fiber sheet according to the first embodiment.
(Step 1) First, as shown in FIG. 1, the reinforcing fiber bundle is spread and widened.
In the present application, the reinforcing fiber bundle means a bundle of reinforcing fiber single yarns. Typical examples of the reinforcing fiber include carbon fiber, glass fiber, and aramid fiber, but are not limited thereto.

In addition, the spread width of the fiber means that the single fiber bundle is widened to a width of 1000 mm or more, more preferably 1.8 mm or more. Here, the reason why the width per 1000 single yarns is increased to 1.3 mm or more is that the effect of opening the fiber unit bundle, for example, improvement in resin impregnation property, etc. appears remarkably.

  A method for spreading and widening the reinforcing fiber bundle is not described in detail here, but a method in which a rectified air flow is applied to the suspended reinforcing fiber bundle traveling in a relaxed state directly and opened. Is more preferable.

(Step S2) Next, the reinforcing fiber bundles that have been spread and widened as described above are combined and integrated to produce a reinforcing fiber sheet having a predetermined orientation angle.
In the present application, the reinforced fiber sheet means a cloth (sheet) that is formed by combining and unifying the reinforced fiber bundles that have been spread and expanded, and oriented at a predetermined angle. It means a bundle of reinforcing fiber bundles that have been spread and widened in parallel and arranged in a plane. In other words, the difference between the “sheet” and the “tape” in the present application is whether or not a plurality of the spread fiber reinforced fiber bundles are joined and integrated so as not to be separated.

FIG. 2 is a diagram illustrating an example of a uniaxial reinforcing fiber sheet.
In FIG. 2, a uniaxial reinforcing fiber sheet 10 is obtained by plain weaving a reinforcing fiber bundle 11 that has been spread and spread and a thread 12 that does not have a reinforcing effect, thereby combining and unifying the reinforcing fiber bundle 11 that has been spread and spread. FIG. 2 (a) shows a uniaxial reinforcing fiber sheet oriented at 0 ° using a reinforcing fiber bundle 11 that has been widened and spread as warps and a thread 12 as wefts, and FIG. A 90 ° -oriented uniaxial reinforcing fiber sheet using the reinforcing fiber bundle 11 that has been widened and spread as the weft 12 and the weft is shown.

  Here, specific examples of the yarn 12 include glass fiber and polyester fiber. Furthermore, if an adhesive fiber having a function such as thermal bonding is used as the yarn 12, the spread fiber-reinforced reinforcing fiber bundle 11 can be further prevented from moving in the width direction and losing its shape, and handleability is improved. An excellent uniaxial reinforcing fiber sheet can be obtained. Further, as the uniaxial reinforcing fiber sheet composed of the reinforcing fiber bundle 11 that has been widened and the yarn 12 that does not have a reinforcing effect, not only the woven fabric described above, but also, for example, a yarn that does not have a reinforcing effect forms a knitted loop. A uniaxial reinforcing fiber knitted fabric having a structure in which reinforcing fiber bundles that are linearly arranged while being formed are entangled may be used.

  Further, the reinforcing fiber sheet may be obtained by bonding an adhesive fiber web to a reinforcing fiber tape in which the spread fiber bundles are spread in parallel and arranged in a plane.

Fig.3 (a) is a figure which shows an example of the reinforcing fiber sheet produced from the uniaxial reinforcing fiber tape.
In FIG. 3A, a uniaxial reinforcing fiber sheet 20 is joined to a reinforcing fiber tape 22 in which a plurality of expanded fiber bundles 22a that are spread and spread are arranged in parallel and arranged in a plane, and the reinforcing fiber tape 22 is bonded onto the reinforcing fiber tape 22. The adhesive fiber web 23 is formed. The reason why the adhesive fiber web 23 is used as the sheet bonded on the reinforcing fiber tape 22 is to allow the uniaxial reinforcing fiber sheet to have flowability. In this way, when the uniaxial reinforcing fiber sheet 20 is molded, it is possible to prevent the impregnation of the matrix resin or the air from being inhibited.

  Further, the reinforcing fiber sheet may be a biaxial reinforcing fiber sheet obtained by weaving or knitting a reinforced fiber bundle that has been spread and widened and joined together.

FIG.3 (b) is a figure which shows an example of a biaxial reinforcement fiber sheet.
As a typical example of the biaxial reinforcing fiber sheet, as shown in FIG. 3 (b), a biaxial reinforcing fiber fabric 24 composed of reinforcing fiber bundles 24a and 24b in which both warps and wefts are spread and widened.
In FIG. 3B, a porous adhesive layer 25 is bonded on the surface of the biaxial reinforcing fiber fabric 24.

  Here, the porous adhesive layer 25 means a fluid-like adhesive body such as a fiber web, and examples thereof include a fiber web made of a hot melt adhesive. In this way, if the adhesive layer is made to have flowability, impregnation with the matrix resin is hindered during molding or when a multiaxial laminated reinforcing fiber sheet is produced using this reinforcing fiber as a constituent sheet. Further, it is possible to prevent the air contained in the multiaxial laminated reinforcing fiber sheet from being obstructed.

The porous adhesive layer 25 is preferably a fiber web made of an adhesive having a basis weight of 10 g / m ² or less. If the basis weight of the fiber web is 10 g / m ² or less, the molded product that has been molded can be made ultra-light, and its high mechanical performance can be maintained. At this time, the porous adhesive layer 25 may be bonded to the surface after producing a biaxial reinforcing fiber sheet using the reinforcing fiber bundles 24a and 24b that have been widened and spread. Alternatively, first, the adhesive layer 25 is bonded onto the surface of each of the expanded and widened reinforcing fiber bundles 24a and 24b, and then the reinforcing fiber sheet is bonded to the reinforcing fiber bundle with the adhesive layer 25 bonded thereto. It may be produced. If the adhesive layer 25 is bonded onto the sheet in this manner, the handleability of the sheet can be improved, or the handleability of the fiber bundle in the sheet production stage can be improved.

Similarly, the porous adhesive layer 25 may be bonded to the uniaxial reinforcing fiber sheet 10 as shown in FIG.
As another example of the biaxial reinforcing fiber sheet, a woven fabric having a structure in which reinforcing fiber bundles are arranged in two orthogonal biaxial axes and a weft yarn is entangled with these biaxial reinforcing fiber bundles, or two orthogonal biaxial reinforcing fiber sheets are used. Examples thereof include a knitted fabric having a structure in which yarns are intertwined with a reinforcing fiber bundle arranged on a shaft while forming a warp or weft loop structure.

  (Step S3) Then, using the reinforcing fiber sheet prepared in Step S2, a long inclined reinforcing fiber sheet oriented at an angle different from that of the reinforcing fiber sheet is prepared.

Hereinafter, a method for producing a long inclined reinforcing fiber sheet will be described.
FIG. 4 is a diagram for explaining a method for producing a long inclined uniaxial strength fiber sheet from a uniaxial reinforcing fiber sheet.
First, as shown in FIG. 1 (a), the opposite side ends of the uniaxial reinforcing fiber sheet 10, that is, the X end and the Y end are joined, and a cylindrical uniaxial reinforcing fiber sheet as shown in FIG. 30. A typical example of this XY end joining method is a method in which the XY end joining portion 15 is joined by bonding with an adhesive, for example, a tape-like hot melt, or the XY end joining portion 15 is stitched. However, it is not limited to this. In addition, it is preferable to join the XY end joining part 15 so that a sheet | seat may not overlap.

  The cylindrical uniaxial reinforcing fiber sheet 30 is continuously formed along a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °), that is, along the cutting position 16 shown in FIG. The long inclined uniaxial reinforcing fiber sheet oriented at θ ° as shown in FIG.

  In the above description, an example in which a tilted uniaxial reinforcing fiber sheet having a θ ° orientation is prepared from a uniaxial reinforcing fiber sheet has been described. Of course, a long inclined biaxial reinforcing fiber is formed from a biaxial reinforcing fiber sheet in the same manner. A sheet can be produced. In this case, an inclined biaxial reinforcing fiber sheet with a ± θ ° orientation is obtained.

  (Step S4) Then, at least two or more types having different orientation angles are selected from the sloped reinforcing fiber sheet produced in Step S3 and the reinforcing fiber sheet produced in Step S2, and they are multiaxial. The laminated reinforcing fiber sheets are laminated and joined together as a constituent sheet.

  Further, when joining and integrating, a reinforcing fiber tape in which a plurality of the spread fiber bundles are spread in parallel and arranged in a plane is produced, and the reinforcing fiber tape is also a multiaxial laminated reinforcing fiber sheet. It is good also as one composition sheet. In this case, at least two types having different orientation angles are selected from the sloped reinforcing fiber sheet prepared in step S3 and the reinforcing fiber sheet prepared in step S2 or the above-described reinforcing fiber tape, and many of them are selected. They are laminated and joined together as a constituent sheet of a shaft laminated fiber sheet. In addition, when producing the reinforcing fiber tape, if a porous adhesive layer 25 as shown in FIG. 3B is bonded to the surface thereof, the handling property of the reinforcing fiber tape is improved. Therefore, it is easy to perform the treatment when joining and integrating.

FIG. 5 is a diagram showing a reinforced fiber laminate joining apparatus that laminates the constituent sheets and joins and integrates them to produce a multiaxial laminated reinforced fiber sheet.
As shown in FIG. 5, the reinforcing fiber laminate bonding apparatus 50 includes a reinforcing fiber sheet supply unit 51 including pull-out rollers 51 a to 51 e that supply the constituent sheets 60 a to 60 e that constitute the multiaxial laminated reinforcing sheet, and the constituent sheets. It consists of a joining part 52 that joins and integrates 60 into a multiaxial laminated reinforcing fiber sheet 61 and a winding part 53 that winds up the multiaxial laminated reinforcing fiber sheet 61.
As a joining method, first, constituent sheets constituting the multiaxial laminated reinforcing fiber sheet are respectively attached to the drawing rollers 51.

  Examples of the constituent sheets 60a to 60e attached to the pull-out roller include the reinforcing fiber sheet prepared in Step S2, the sloped reinforcing fiber sheet prepared in Step S3, and the above-described reinforcing fiber tape. Further, if necessary, a random mat of reinforcing fibers, a mat made of adhesive fibers, a matrix resin mat or a film may be added as the constituent sheet 60. In addition, an adhesive layer may be laminated in advance. Note that the mat or film added as the constituent sheet 60 is preferably a permeable material such as a fiber web. Thus, if each sheet is provided with a permeable property, a matrix can be formed during molding. It is possible to prevent the impregnation of the resin from being hindered or the escape of air contained in the multiaxial laminated reinforcing fiber sheet from being hindered.

Drawing 6 is a figure showing an example of the 1st-5th composition sheet which constitutes a multiaxial lamination reinforcement fiber sheet.
In FIG. 6, the first component sheet 60a is a 0 ° -oriented uniaxial reinforcing fiber sheet produced in step S2, and the second component sheet 60b is a 90 ° -oriented uniaxial reinforcing material similarly produced in step S2. The fiber sheet, the third component sheet 60c is a 45 ° -oriented inclined uniaxial reinforcing fiber sheet prepared in step S3, and the fourth component sheet 60d is the −45 ° -oriented gradient prepared in step S3. The uniaxial reinforcing fiber sheet and the fifth component sheet 60e are fiber webs having a reinforcing effect. In addition, although not shown in figure, the adhesive layer for joining and integrating each component sheet shall be laminated | stacked on each component sheet 60a-60e.

Then, the constituent sheets 60 a to 60 e attached to the drawing rollers 51 a to 51 e of the fiber reinforced sheet supply unit 51 are drawn out from the drawing rollers and supplied to the joining unit 52.
In the joining part 52, each structural sheet 60a-60e supplied from the said fiber reinforced sheet supply part 51 is laminated | stacked, and it unites and integrates.

This joining and integration method is performed by joining with a thermal adhesive or the like, or stitching such as a warp knitting method or a sewing method using a yarn or a fiber having a reinforcing effect. For example, when the constituent sheets 60 a to 60 e shown in FIG. 6 are joined, since the adhesive layer is previously applied to each constituent sheet, the constituent sheets are joined by pressing while applying heat at the joint portion 52. In addition, when joining with a thermal adhesive etc., in order to ensure the three-dimensional drape property of a multiaxial laminated reinforcing fiber sheet, it is more preferable to use point bonding or partial bonding than surface bonding.
Thereafter, the multiaxial laminated reinforcing fiber sheet 61 joined and integrated at the joining portion 52 is wound up by the winding portion 53.

  If the multiaxial laminated reinforcing fiber sheet obtained as described above is used as a composite material reinforcing material, a composite material molded product can be efficiently realized.

Examples of the molding process will be given below.
First, after forming a near net using the multiaxial laminated reinforcing fiber sheet 61, it is molded by a resin transfer molding method.

  Furthermore, in the production process of the multiaxial laminated reinforcing fiber sheet of the first embodiment, constituent sheets constituting the multiaxial laminated reinforcing fiber sheet are produced in advance, and finally they are joined and integrated. Therefore, it is also possible to add a layer made of a matrix used at the time of forming the composite material between the constituent sheets. If it does in this way, a composite material molded object can be shape | molded more simply and efficiently from the said multiaxial laminated reinforcing fiber sheet. The matrix layer is preferably a fiber web made of a matrix resin. In this way, when producing a multiaxial laminated reinforcing fiber sheet using the fibrous web made of a matrix resin as a constituent sheet, the multiaxial laminated reinforcing sheet is used. It is possible to prevent the air contained in the fiber sheet from becoming difficult to escape.

  For example, when a thermosetting resin fiber web is used as the constituent sheet, as shown in FIG. 7, the thermosetting resin fiber web 74, the reinforcing fiber sheets 71 to 72, and the inclined reinforcing fiber sheet 73. The multiaxial laminated reinforcing fiber sheet 70 is produced by alternately stacking, and the multiaxial laminated reinforcing fiber sheet including the fiber web of the thermosetting resin as the matrix is formed on an open mold by so-called vacuum bag thermoforming. By performing the above, molding processing becomes possible.

  On the other hand, when a thermoplastic resin fiber web is used as a constituent sheet of the multiaxial laminated reinforcing fiber sheet, as shown in FIG. 7, the thermoplastic resin fiber web, the reinforcing fiber sheet, and the inclined reinforcing fiber sheet, A multiaxial laminated reinforcing fiber sheet is produced by alternately laminating, and the multiaxial laminated reinforcing fiber sheet containing the thermoplastic resin fiber web as the matrix is heated and pressed by a press machine, thereby enabling molding processing. Become.

  Further, as a constituent sheet of the multiaxial laminated reinforcing fiber sheet, instead of adding a thermosetting resin as a matrix or a fiber web of thermoplastic resin, when producing a reinforcing fiber sheet or tape in the step S2, A prepreg may be prepared by impregnating the reinforcing fiber sheet or the reinforcing fiber tape with a matrix agent. In this way, if the matrix is a thermosetting resin, the multiaxial laminated reinforcing fiber sheet can be molded by performing so-called vacuum bag thermoforming on an open mold, or If the matrix is a thermoplastic resin, the multiaxial laminated reinforcing fiber sheet can be molded by performing so-called vacuum bag heat molding or heat compression molding on an open mold, and the multiaxial laminated reinforcing fiber sheet becomes possible. Therefore, the composite material molded product can be molded more easily and efficiently.

  As described above, according to the first embodiment, a reinforcing fiber sheet having a predetermined orientation angle is produced by combining and integrating a multiaxial laminated reinforcing fiber sheet with a reinforcing fiber bundle that has been spread and widened. An inclined reinforcing fiber sheet having an orientation angle θ different from that of the reinforcing fiber sheet is produced using the reinforcing fiber sheet, and the inclined reinforcing fiber sheet and the reinforcing fiber sheet or the reinforcing fiber bundle that has been widened and spread are parallel to each other. Since at least two types of reinforcing fiber tapes that have been aligned and arranged in a plane are selected and at least two types having different orientation angles are stacked and joined together, without introducing a new machine Using a conventional apparatus, a multiaxial laminated reinforcing fiber sheet can be produced at a low cost.

  In addition, according to the first embodiment, the inclined reinforcing fiber sheet oriented at the angle θ is formed into a cylindrical shape by joining opposite side ends of the reinforcing fiber sheet, and the reinforcing fiber sheet is formed into the cylindrical shape. Is produced by continuously inclining and cutting at an angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) and a constant width. It can be manufactured easily and at low cost.

  Furthermore, according to the first embodiment, since the multiaxial laminated reinforcing fiber sheet is produced by laminating and separately joining the constituent sheets produced separately, Axial laminated reinforced fiber sheet can be produced. In addition, if a fiber web of thermosetting resin or thermoplastic resin is added in advance as a constituent sheet, it can be easily molded and multiaxial laminated reinforced A composite material using a fiber sheet as a reinforcing material can be provided.

  Furthermore, according to the first embodiment, as the constituent sheet constituting the multiaxial laminated reinforcing fiber sheet, the reinforcing fiber obtained by expanding and spreading the fiber single yarn bundle so that the width per 1000 fibers is 1.3 mm or more. Since a bundle is used, even a matrix resin having a high viscosity can be impregnated quickly and has an effect of being easily molded. In addition, in a composite material molding using a multiaxial laminated reinforcing fiber sheet, the swell in the thickness direction of the multiaxial laminated reinforcing fiber sheet as the reinforcing material is extremely small, and the block-like lump size is small and more uniform. Since it is distributed, even if an external force is applied to the composite material molded article, the degree of stress concentration is reduced, it can withstand a larger load, and the fatigue resistance against the external force is excellent.

(Embodiment 2)
Hereinafter, a method for producing the multiaxial laminated reinforcing fiber sheet of the second embodiment will be described.
In the first embodiment, the sloped reinforcing fiber sheet is obtained by joining the opposing side end portions of the reinforcing fiber sheet and continuously cutting the slope, but in Embodiment 2, the reinforcing fiber sheet is sloped and cut. Thus, a plurality of inclined reinforcing fiber sheets are produced, and the end portions of the inclined reinforcing fiber sheets are joined to each other.

  As shown in FIG. 1, the multiaxial laminated reinforcing fiber sheet according to the second embodiment first widens and spreads the reinforcing fiber bundle (step S1), as shown in FIG. A reinforcing fiber sheet having a predetermined orientation angle is produced using the reinforcing fiber bundle (step S2).

  (Step S3) Then, from the reinforcing fiber sheet produced in Step S2, a length having an orientation angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) different from that of the reinforcing fiber sheet. A slanted reinforcing fiber sheet is produced.

Here, a method for producing a long inclined reinforcing fiber sheet in the second embodiment will be described.
FIG. 9 is a diagram for explaining a method of producing a long inclined uniaxial strength fiber sheet from the uniaxial reinforcing fiber sheet according to the second embodiment.

  First, the uniaxial reinforcing fiber sheet 10 is inclined and cut at a predetermined angle θ and a constant width, that is, at a cutting position 16 shown in FIG. (A), and a plurality of inclined uniaxial reinforcing fiber sheets shown in FIG. 101-103 are obtained. The cutting width of the reinforcing fiber sheet 10 is determined by the angle θ and the width of the sheet or tape to be joined and integrated in step S4 described later.

  Then, the uniaxial reinforcing fiber sheets 101 to 103 that have been inclined and cut are rotated in the same direction (see FIG. 2C), and the end portions of the inclined and cut uniaxial reinforcing fiber sheets are joined and connected. That is, as shown in FIG. 3C, the Y1 end of the uniaxial reinforcing fiber sheet 101 that is inclined and the X2 end of the inclined uniaxial reinforcing fiber sheet 102 are joined, and the uniaxial reinforcing fiber sheet 102 that is inclined and cut. All of the uniaxial reinforcing fiber sheets that have been cut by inclination are connected in such a manner as to join the Y2 end of X2 and the X3 end of the uniaxial reinforcing fiber sheet 103 that has been cut by inclination.

  As a result, finally, a long inclined uniaxial reinforcing fiber sheet oriented at an angle θ as shown in FIG. A typical example of this XY end joining method is a method in which the XY end joining portion 15 is joined by bonding with an adhesive, for example, a tape-like hot melt, or the XY end joining portion 15 is stitched. 2, and further, the porous adhesive layer 23 shown in FIG. 2 is joined on the surface of the uniaxial reinforcing fiber sheet subjected to inclined cutting, and the plurality of inclined uniaxial reinforcing fiber sheets are gently bonded to each other. However, it is not limited to this. In addition, the said porous adhesive bond layer 23 means the thing of adhesive-like bodies with flowability, such as a fiber web, for example, the fiber web which consists of a hot-melt-adhesive etc. is mentioned as an example.

  Furthermore, in the above description, an example in which a tilted uniaxial reinforcing fiber sheet with θ orientation is produced from a uniaxial reinforcing fiber sheet has been given. Of course, a long inclined biaxial reinforcing fiber is formed from a biaxial reinforcing fiber sheet in the same manner. A sheet can also be produced. In this case, an inclined biaxial reinforcing fiber sheet with a ± θ ° orientation is obtained.

(Step S4) Then, the sloped reinforcing fiber sheet produced in Step S3 and the reinforcing fiber sheet produced in Step S2 or the reinforcing fiber bundle that has been widened and spread are aligned in parallel and arranged in a planar shape. Among the reinforced fiber tapes, at least two kinds having different orientation angles are selected, and they are laminated as a constituent sheet of a multiaxial laminated fiber sheet and joined and integrated.
Since this joining and integration method is the same as that described with reference to FIGS. 5 and 6 in the first embodiment, the description thereof is omitted.

  Furthermore, the constituent sheets of the multiaxial laminated fiber sheet joined and integrated in the step S4 are only the sloped reinforcing fiber sheet obtained in the step S3, the reinforcing fiber sheet obtained in the step S2, and the above-mentioned reinforcing fiber tape. Instead, as described with reference to FIG. 6 or FIG. 7 in the first embodiment, a random mat of fibers having a reinforcing effect, a mat of adhesive fibers, or a matrix resin mat used at the time of molding a composite material Alternatively, a film or the like may be added. If it does in this way, the composite material which uses the said multiaxial laminated reinforcing fiber sheet as a reinforcing material can be shape | molded more simply and efficiently.

  The random mat, the adhesive fiber mat, the matrix resin mat, or the like added as the component sheet is preferably a fiber web. In this way, when a multiaxial laminated reinforcing fiber sheet is produced using a fiber web made of a matrix resin as a constituent sheet, it is possible to prevent the air contained in the multiaxial laminated reinforcing fiber sheet from becoming difficult to escape.

  Further, as a constituent sheet of the multiaxial laminated reinforcing fiber sheet, instead of adding a thermosetting resin as a matrix or a fiber web of thermoplastic resin, when producing a reinforcing fiber sheet or tape in the step S2, A prepreg may be prepared by impregnating the reinforcing fiber sheet or the reinforcing fiber tape with a matrix agent. In this way, if the matrix is a thermosetting resin, the multiaxial laminated reinforcing fiber sheet can be molded by performing so-called vacuum bag thermoforming on an open mold, or If the matrix is a thermoplastic resin, the multiaxial laminated reinforcing fiber sheet can be molded by performing so-called vacuum bag heat molding or heat compression molding on an open mold, and the multiaxial laminated reinforcing fiber sheet becomes possible. Therefore, the composite material molded product can be molded more easily and efficiently.

  As described above, according to the second embodiment, a reinforcing fiber sheet having a predetermined orientation angle is produced by combining and integrating a multiaxial laminated reinforcing fiber sheet with reinforcing fiber bundles that have been spread and widened, An inclined reinforcing fiber sheet having an orientation angle θ different from that of the reinforcing fiber sheet is produced using the reinforcing fiber sheet, and the inclined reinforcing fiber sheet and the reinforcing fiber sheet or the reinforcing fiber bundle that has been widened and spread are parallel to each other. Since at least two types of reinforcing fiber tapes that have been aligned and arranged in a plane are selected and at least two types having different orientation angles are stacked and joined together, without introducing a new machine Using a conventional apparatus, a multiaxial laminated reinforcing fiber sheet can be produced at a low cost.

  Further, according to the second embodiment, the inclined reinforcing fiber sheet oriented at the angle θ, the reinforcing fiber sheet, the predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ < 90 °), and a plurality of inclined reinforcing fiber sheets are produced by being inclined and cut at a constant width, and the end portions of the inclined and cut sheets are joined and connected to produce a long inclined reinforcing fiber sheet. Since it did in this way, a long inclination reinforcement fiber sheet can be produced easily and at low cost.

  Furthermore, according to the second embodiment, since the multiaxial laminated reinforcing fiber sheet is prepared by laminating the separately produced constituent sheets and joining and integrating them, the heat that becomes the matrix is formed on the constituent sheets. If a fiber web of curable resin or thermoplastic resin is added, a composite material using a multiaxial laminated reinforcing fiber sheet as a reinforcing material can be easily molded.

  Furthermore, according to the second embodiment, as the constituent sheet constituting the multiaxial laminated reinforcing fiber sheet, the reinforcing fiber obtained by expanding and spreading the fiber single yarn bundle so that the width per 1000 fibers is 1.3 mm or more. Since a bundle is used, even a matrix resin having a high viscosity can be impregnated quickly and has an effect of being easily molded. In addition, in a composite material molding using a multiaxial laminated reinforcing fiber sheet, the swell in the thickness direction of the multiaxial laminated reinforcing fiber sheet as the reinforcing material is extremely small, and the block-like lump size is small and more uniform. Since it is distributed, even if an external force is applied to the composite material molded article, the degree of stress concentration is reduced, it can withstand a larger load, and the fatigue resistance against the external force is excellent.

(Embodiment 3)
Hereinafter, a method for producing the multiaxial laminated reinforcing fiber sheet of the third embodiment will be described.
In the embodiment, in the step of preparing the gradient reinforcing fiber sheet, a long inclined reinforcing fiber sheet is prepared from the reinforcing fiber sheet, and the long inclined strength fiber sheet is used as a constituent sheet of the multiaxial laminated fiber sheet. However, in the third embodiment, a long inclined reinforcing fiber sheet is not produced, and the reinforcing fiber sheet is obliquely cut to produce a short inclined reinforcing fiber sheet. The sheet joined to the reinforcing fiber sheet is used as a constituent sheet of the multiaxial laminated fiber sheet.

  As shown in FIG. 1, the multiaxial laminated reinforcing fiber sheet according to the third embodiment first widens and spreads the reinforcing fiber bundle (step S1), as shown in FIG. A reinforcing fiber sheet having a predetermined orientation angle is produced using the reinforcing fiber bundle (step S2).

(Step S3) Then, an inclined reinforcing fiber sheet having an orientation angle θ different from that of the reinforcing fiber sheet is prepared from the reinforcing fiber sheet prepared in Step S2.
Here, the manufacturing method of the inclination reinforcement fiber sheet in this Embodiment 3 is demonstrated.

FIG. 10 is a diagram for explaining a method of producing an inclined uniaxial strength fiber sheet from a uniaxial reinforcing fiber sheet according to the third embodiment.
The inclined reinforcing fiber sheet is cut at a predetermined angle θ and at a constant width, that is, at a cutting position 16 shown in FIG. The uniaxial reinforcing fiber sheets 101 to 103 are obtained. Note that the cutting width of the reinforcing fiber sheet 10 is determined by the angle θ and the width of the sheet or tape that surface-bonds the plurality of inclined sheets 101 to 103 in step S4 described later.

  Of course, the inclined reinforcing fiber sheet obtained in step S3 is not limited to the inclined uniaxial reinforcing fiber sheet shown in FIG. 10, but may be an inclined biaxial reinforcing fiber sheet. And also in the case of an inclination biaxial reinforcement fiber sheet, it can obtain by carrying out the inclination cutting of the biaxial reinforcement fiber sheet by the method similar to the above-mentioned.

  (Step S4) Then, the plurality of gradient reinforcing fiber sheets 101 to 103 obtained as described above are first bonded onto, for example, a 0 ° -oriented uniaxial reinforcing fiber sheet 10 as shown in FIG. Of course, it is not restricted to a uniaxial reinforcement fiber sheet, You may make it join the said some inclination reinforcement fiber sheets 101-103 to a biaxial reinforcement fiber sheet and a reinforcement fiber tape.

  Examples of the joining method include a method of joining by bonding with an adhesive, for example, hot melt, or a method of joining by joining the XY end joining portion 15. In the case where the inclined reinforcing fiber sheet is bonded to the other component sheet with an adhesive or the like, in order to ensure the three-dimensional drape of the component sheet, not point bonding but point bonding or partial bonding. Is preferred.

  And after this, among the reinforcing fiber sheet to which the prepared gradient reinforcing fiber sheet prepared in Step S3 is joined, and the reinforcing fiber sheet prepared in Step S2, or the reinforcing fiber tape, at least have different orientation angles. Two or more types are selected, and they are laminated and integrated as a constituent sheet of a multiaxial laminated fiber sheet.

Since this joining and integration method is the same as that described with reference to FIGS. 5 and 6 in the first embodiment, description thereof is omitted here.
As described in the first embodiment, as a constituent sheet of a multiaxial laminated fiber sheet, a random mat of fibers having a reinforcing effect, a mat of adhesive fibers, or a matrix resin used for molding a composite material A mat or film may be added. If it does in this way, a composite material molded object can be shape | molded more simply and efficiently from the said multiaxial laminated reinforcing fiber sheet.

  Furthermore, the random mat, the adhesive fiber mat, the matrix resin mat, and the like added as the constituent sheet are preferably fiber webs. In this way, when a multiaxial laminated reinforcing fiber sheet is produced using a fiber web made of a matrix resin as a constituent sheet, it is possible to prevent the air contained in the multiaxial laminated reinforcing fiber sheet from becoming difficult to escape.

  Further, as a constituent sheet of the multiaxial laminated reinforcing fiber sheet, instead of adding a thermosetting resin as a matrix or a fiber web of thermoplastic resin, when producing a reinforcing fiber sheet or tape in the step S2, A prepreg may be prepared by impregnating the reinforcing fiber sheet or the reinforcing fiber tape with a matrix agent. In this way, if the matrix is a thermosetting resin, the multiaxial laminated reinforcing fiber sheet can be molded by performing so-called vacuum bag thermoforming on an open mold, or If the matrix is a thermoplastic resin, the multiaxial laminated reinforcing fiber sheet can be molded by performing so-called vacuum bag heat molding or heat compression molding on an open mold, and the multiaxial laminated reinforcing fiber sheet becomes possible. Therefore, the composite material molded product can be molded more easily and efficiently.

  As described above, according to the third embodiment, the reinforcing fiber sheet obtained by combining and integrating the multiaxial laminated reinforcing fiber sheet into a sheet having a predetermined orientation angle from the reinforcing fiber bundle that has been spread and widened. Alternatively, a reinforcing fiber tape in which the spread fiber bundles are spread in parallel and arranged in a plane is produced, and the inclined reinforcing fiber sheet having an orientation angle θ different from that of the reinforcing fiber sheet is used as the reinforcing fiber sheet. Selected from the reinforcing fiber sheet to which the inclined reinforcing fiber sheet is bonded, and the reinforcing fiber sheet or the reinforcing fiber tape, having at least two different orientation angles, and laminating them. Since it is designed to be joined and integrated, it is possible to produce a multiaxial laminated reinforcing fiber sheet more easily and at low cost by using conventional equipment without introducing a new machine. Kill.

  Further, according to the third embodiment, the reinforcing fiber sheet is inclined with the predetermined constant angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) and a constant width. The sloped reinforcing fiber sheet is manufactured by joining the reinforcing fiber sheet to the reinforcing fiber sheet, so that the sloped reinforcing fiber sheet can be manufactured more easily and at low cost.

  Furthermore, according to the third embodiment, since the multiaxial laminated reinforcing fiber sheet is prepared by laminating the separately produced constituent sheets and joining them together, the heat that becomes the matrix is formed on the constituent sheets. If a fiber web of curable resin or thermoplastic resin is added, a composite material using a multiaxial laminated reinforcing fiber sheet as a reinforcing material can be easily molded.

  Furthermore, according to the third embodiment, as a constituent sheet constituting the multiaxial laminated reinforcing fiber sheet, the reinforcing fiber obtained by expanding and spreading the fiber single yarn bundle so that the width per 1000 pieces is 1.3 mm or more. Since a bundle is used, even a matrix resin having a high viscosity can be impregnated quickly and has an effect of being easily molded. In addition, in a composite material molding using a multiaxial laminated reinforcing fiber sheet, the swell in the thickness direction of the multiaxial laminated reinforcing fiber sheet as the reinforcing material is extremely small, and the block-like lump size is small and more uniform. Since it is distributed, even if an external force is applied to the composite material molded article, the degree of stress concentration is reduced, it can withstand a larger load, and the fatigue resistance against the external force is excellent.

Next, examples of the present application will be described.
As the reinforcing fiber, Toray M30S, 18K untwisted carbon fiber is used.
First, by opening air rectified from the orthogonal direction to the carbon fiber bundle that is running in a suspended state, the expanded and widened reinforcing fiber having a width of 31 mm (2.58 mm per 1000 single yarns) is obtained. obtain.

Next, on the surface of the carbon fiber bundle that has been widened, the polyamide-based hot melt adhesive is pulled down by air while being discharged from a melting head having a large number of nozzle holes arranged in a row in the width direction. As a result, a fiber web having a basis weight of 4 g / m ² was formed, which was composed of hot melt adhesive fibers having a diameter of 18 μm.

  Then, using the opened carbon fiber bundle and the yarn on which the fiber web is applied on the surface, a 0 ° -oriented uniaxial reinforcing fiber sheet 81 and a 90 ° -oriented uniaxial reinforcing fiber sheet 82 are produced. did.

  Furthermore, after weaving so that there is substantially no gap between the fiber bundles and there is no overlap between the fiber bundles using the spread and widened carbon fiber bundles on which the fiber web is applied on the surface, 240 ° C. And then immediately lightly pressed with a pressure roll to produce a biaxial reinforced fiber sheet, and after the biaxial reinforced fiber sheet is joined into a cylindrical shape, it is cut at an inclination angle of 45 °. A tilted biaxial reinforcing fiber sheet 83 with an orientation was produced.

  And three reinforcing fiber sheets produced as described above, that is, uniaxial reinforcing fiber sheet 81 oriented 0 °, uniaxial reinforcing fiber sheet 82 oriented 90 °, and inclined biaxial reinforcing fiber sheet 83 oriented 45 °, Are laminated and then joined and integrated to produce a multiaxial laminated reinforcing fiber sheet.

Specifically, as shown in FIG. 8, three component sheets are laminated between two types of uniaxial reinforcing fiber sheets so as to sandwich the inclined biaxial reinforcing fiber sheets, and then heated to 240 ° C. and immediately applied. Pressure was applied with a pressure roll. As a result, a multiaxial laminated reinforcing fiber sheet 80 having a basis weight of 97.3 g / m ² and a four-axis configuration (0 ° / + 45 ° / −45 ° / 90 °) was obtained.

  The method for producing a multiaxial laminate sheet of the present invention and the multiaxial laminate sheet produced by the method are used for composite materials that are particularly lightweight and require high mechanical performance, such as for aerospace and high-grade fishing rods. It is useful as

It is a flowchart which shows the preparation process of the multiaxial lamination reinforcing fiber sheet of Embodiment 1 of this invention. It is a figure which shows an example of the uniaxial reinforcement fiber sheet of 0 degree orientation concerning Embodiment 1 of this invention. It is a figure which shows an example of the uniaxial reinforcement fiber sheet of 90 degree orientation concerning Embodiment 1 of this invention. It is a figure which shows the uniaxial reinforcement fiber sheet of 0 degree orientation concerning Embodiment 1 of this invention. It is a figure which shows the biaxial reinforcement fiber sheet | seat with which the porous adhesive bond layer was joined to the surface concerning Embodiment 1 of this invention. It is a figure explaining the manufacturing method of the inclination uniaxial reinforcement fiber sheet concerning Embodiment 1 of this invention. It is a figure which shows the apparatus which joins each component sheet | seat which comprises the multiaxial laminated reinforcing fiber sheet concerning Embodiment 1 of this invention, and produces a multiaxial laminated reinforcing fiber sheet. It is a figure which shows an example of the structural sheet which comprises the multiaxial lamination | stacking reinforcement fiber sheet concerning Embodiment 1 of this invention. It is a figure which shows an example of the combination of the structure sheet | seat which comprises the multiaxial lamination reinforcing fiber sheet concerning Embodiment 1 of this invention. It is one Example of the structural sheet which comprises the multiaxial lamination reinforcing fiber sheet of this invention. It is a figure explaining the manufacturing method of the inclination uniaxial reinforcement fiber sheet concerning Embodiment 2 of this invention. FIG. 5 is a diagram for explaining a method for producing an inclined uniaxial reinforcing fiber sheet according to a third embodiment of the present invention. It is a figure which shows the uniaxial reinforcement fiber sheet to which the inclination uniaxial reinforcement fiber sheet concerning Embodiment 3 of this invention was joined. It is a figure which shows the system of the conventional warp knitting Russell system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,30 Uniaxial reinforcement fiber sheet 11 Reinforcement fiber bundle 12 which was opened and widened 12 Yarn 20 Uniaxial reinforcement fiber sheet 22 Uniaxial reinforcement fiber tape 22a, 24a Reinforcement fiber bundle which was opened and widened 23 Adhesive fiber web 25 Porous adhesive layer DESCRIPTION OF SYMBOLS 50 Reinforcement fiber lamination joining apparatus 51 Reinforcement fiber sheet supply part 51a-51e Pull-out roller 52 Joining part 53 Winding part 60 Composition sheet 61,70,80 Multiaxial lamination reinforcement fiber sheet 71,72 Reinforcement fiber sheet 73 Inclination reinforcement fiber sheet 74 Fiber web of thermosetting resin 81 Uniaxial reinforcing fiber sheet oriented at 0 ° 82 Uniaxial reinforcing fiber sheet oriented at 90 ° 83 Inclined biaxial reinforcing fiber sheet 101, 102, 103 Inclined uniaxial reinforcing fiber sheet 1100 Warp knitted raschel System 1101 Fiber orientation machine 1102 Weft insertion machine 1103 Ga Id part 1104 Stitching part 1105 Winding part

Claims (26)

An opening and widening step for expanding and expanding the reinforcing fiber single yarn bundle so that the width per 1000 fibers is 1.3 mm or more;
Reinforcing fiber sheet production step of producing a reinforcing fiber sheet having a predetermined orientation angle by combining and unifying a plurality of the spread fiber bundles that have been spread and spread,
An inclined reinforcing fiber sheet producing step of producing at least one kind of inclined reinforcing fiber sheet having an orientation angle different from that of the reinforcing fiber sheet, using the reinforcing fiber sheet;
Of the inclined reinforcing fiber sheet produced in the inclined reinforcing fiber sheet production step and the reinforcing fiber sheet produced in the reinforcing fiber sheet production step, two or more kinds having different orientation angles were selected and selected. A bonding integration step of laminating and integrating the sheets with different orientation angles,
A method for producing a multiaxial laminated reinforcing fiber sheet. An opening and widening step for expanding and expanding the reinforcing fiber single yarn bundle so that the width per 1000 fibers is 1.3 mm or more;
Reinforcing fiber sheet production step of producing a reinforcing fiber sheet having a predetermined orientation angle by combining and unifying a plurality of the spread fiber bundles that have been spread and spread,
An inclined reinforcing fiber sheet producing step of producing at least one kind of inclined reinforcing fiber sheet having an orientation angle different from that of the reinforcing fiber sheet, using the reinforcing fiber sheet;
Reinforcing fiber tape production step of producing a reinforcing fiber tape in which a plurality of the spread fiber bundles are spread in parallel and arranged in a plane;
Of the reinforcing fiber sheet prepared in the inclined reinforcing fiber sheet and the reinforcing fiber sheet prepared in the reinforcing fiber sheet or the reinforcing fiber tape prepared step, A joining integration step of selecting two or more types having different orientation angles, and laminating and integrating the selected sheets or tapes having different orientation angles.
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 1 or 2,
The inclined reinforcing fiber sheet production step includes:
A joining step for joining the opposing side ends of the reinforcing fiber sheet to form a cylinder; and
The reinforcing fiber sheets joined in a cylindrical shape are continuously formed at a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the axial direction of the cylindrical reinforcing fiber sheet. An inclined cutting step for performing an inclined cutting,
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 1,
The inclined reinforcing fiber sheet production step includes:
A predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis of the reinforcing fiber sheet, and the angle θ and the inclined reinforcing fiber in the joining and integrating step An inclined cutting step for inclinedly cutting the reinforcing fiber sheet at a width determined by a sheet width to be joined and integrated with the sheet;
A joining step that joins and joins the ends of the plurality of sloped reinforcing fiber sheets obtained by the slope cutting,
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 2,
The inclined reinforcing fiber sheet production step includes:
A predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis of the reinforcing fiber sheet, and the angle θ and the inclined reinforcing fiber in the joining and integrating step An inclined cutting step for inclinedly cutting the reinforcing fiber sheet at a width determined by a sheet or tape width to be joined and integrated with the sheet;
A joining step that joins and joins the ends of the plurality of sloped reinforcing fiber sheets obtained by the slope cutting,
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 1,
The inclined reinforcing fiber sheet production step includes:
A predetermined angle (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis of the reinforcing fiber sheet, and the width of the sheet to be surface-bonded to the inclined reinforcing fiber sheet. An inclined cutting step for inclinedly cutting the reinforcing fiber sheet with a width determined by:
The plurality of inclined reinforcing fiber sheets obtained by the inclined cutting are surface-bonded to the reinforcing fiber sheet or the reinforcing fiber tapes in which the plurality of spread fiber bundles are spread in parallel and arranged in a plane. A step of joining the end portions of the sloped reinforcing fiber sheet,
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 2,
The inclined reinforcing fiber sheet production step includes:
A predetermined angle (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis of the reinforcing fiber sheet, and a sheet to be surface-bonded to the inclined reinforcing fiber sheet and the angle θ An inclined cutting step for inclinedly cutting the reinforcing fiber sheet at a width determined by the width of the tape;
The plurality of inclined reinforcing fiber sheets obtained by the inclined cutting are surface-bonded to the reinforcing fiber sheet or the reinforcing fiber tapes in which the plurality of spread fiber bundles are spread in parallel and arranged in a plane. A step of joining each end of the sloped reinforcing fiber sheet,
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 1 or 2,
The reinforcing fiber sheet is a uniaxially oriented reinforcing fiber sheet obtained by bonding and unifying the reinforcing fiber bundle that has been spread and widened using a thread.
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 8,
The yarn has an adhesive function,
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 1 or 2,
The reinforcing fiber sheet is formed by bonding an adhesive fiber web to a reinforcing fiber tape in which a plurality of the spread fiber bundles that have been spread and spread are arranged into a sheet, and the spread fiber bundles that have been spread and spread are combined and integrated. Is a uniaxially oriented reinforcing fiber sheet,
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 1 or 2,
The reinforcing fiber sheet is a biaxially oriented reinforcing fiber sheet obtained by weaving or knitting the unfolded and widened reinforcing fiber bundle and integrating them.
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 1 or 2,
Bonding a porous adhesive layer having a basis weight of 10 g / m ² or less to the surface of the reinforcing fiber sheet;
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 2,
Bonding a porous adhesive layer having a basis weight of 10 g / m ² or less to the surface of the reinforcing fiber tape;
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 1 or 2,
The reinforcing fiber sheet manufacturing step includes bonding a porous adhesive layer having a basis weight of 10 g / m ² or less to the surface of the spread fiber bundle that has been spread and spread, and then reinforcing fiber to which the porous adhesive layer has been bonded. Bind and unify the bundle,
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 1 or 2,
In the joining and integration step, joining and integration are performed using a porous adhesive.
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 1 or 2,
In the joining and integration step, joining and integration are performed by stitching.
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 1 or 2,
The bonding integration step includes a matrix layer between the laminated layers when bonding and integrating.
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 17,
The matrix layer is made of a thermoplastic resin or a fiber web of thermoplastic resin,
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 1 or 2,
The reinforcing fiber sheet production step impregnates the reinforcing fiber sheet with a matrix resin when producing the reinforcing fiber sheet.
A method for producing a multiaxial laminated reinforcing fiber sheet. In the method for producing a multiaxial laminated reinforcing fiber sheet according to claim 2,
The reinforcing fiber tape production step impregnates the reinforcing fiber tape with a matrix resin when producing the reinforcing fiber tape.
A method for producing a multiaxial laminated reinforcing fiber sheet. A reinforcing fiber sheet having a predetermined orientation angle is produced by bonding and integrating a plurality of reinforcing fiber bundles that are spread and widened so that the width per 1000 single yarns is 1.3 mm or more, and the reinforcing fiber sheet The reinforcing fiber sheet that is formed into a cylindrical shape by joining the opposite side end portions of the tube at a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the axial direction of the cylinder. , Continuously inclined cutting,
A slanted reinforcing fiber sheet oriented at a long θ degree. A reinforcing fiber sheet having a predetermined orientation angle is produced by bonding and integrating a plurality of reinforcing fiber bundles that are spread and widened so that the width per 1000 single yarns is 1.3 mm or more, and the reinforcing fiber sheet A predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis, and the angle θ and a sheet width for joining and integrating the inclined reinforcing fiber sheets In a width determined by the slope cut, connected while joining each end of a plurality of slope reinforcing fiber sheets obtained by the slope cut,
A slanted reinforcing fiber sheet oriented at a long θ degree. A reinforcing fiber sheet having a predetermined orientation angle is produced by bonding and integrating a plurality of reinforcing fiber bundles that are spread and widened so that the width per 1000 single yarns is 1.3 mm or more, and the reinforcing fiber sheet Of a sheet or tape to be surface-bonded to a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis and the angle θ. A plurality of inclined reinforcing fiber sheets obtained by inclined cutting at a width determined by the width, and the reinforcing fiber sheets or a plurality of the expanded fiber bundles that have been widened and spread in parallel to each other. Connecting each end of the sloped reinforcing fiber sheet while surface-bonding to the reinforcing fiber tape arranged in a shape,
A slanted reinforcing fiber sheet oriented at a long θ degree. A plurality of reinforcing fiber bundles spread and widened so that the width per 1000 single yarns is 1.3 mm or more to produce a reinforcing fiber sheet having a predetermined orientation angle. Reinforcing fiber sheet joined to the opposite side ends into a cylindrical shape at a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the axial direction of the tube, The inclined reinforcing fiber sheet having an orientation angle different from that of the reinforcing fiber sheet is produced by continuously inclined cutting, and the orientation angle of the produced inclined reinforcing fiber sheet and the reinforcing fiber sheet is different. Two or more types are selected, and the selected orientation angles are stacked and joined together.
A multiaxial laminated reinforcing fiber sheet characterized by that. A plurality of reinforcing fiber bundles that have been spread and widened so that the width per 1000 single yarns is 1.3 mm or more are bonded and integrated to produce a reinforcing fiber sheet having a predetermined orientation angle. And a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) with respect to the orientation axis, and the angle θ and the sheet width to be joined and integrated with the inclined reinforcing fiber sheet. A plurality of inclined reinforcing fiber sheets are produced by being inclined and cut at a fixed width, and the ends of the inclined reinforcing fiber sheets that have been inclined and cut are joined and joined to have an orientation angle different from that of the reinforcing fiber sheets. An inclined reinforcing fiber sheet is prepared, and two or more types having different orientation angles are selected from the prepared inclined reinforcing fiber sheet and the reinforcing fiber sheet, and the selected sheets having different orientation angles are laminated and bonded. United,
A multiaxial laminated reinforcing fiber sheet characterized by that. A plurality of reinforcing fiber bundles that have been spread and widened so that the width per 1000 single yarns is 1.3 mm or more are bonded and integrated to produce a reinforcing fiber sheet having a predetermined orientation angle. A sheet or tape for surface-bonding a predetermined angle θ (−90 ° <θ <0 °, 0 ° <θ <90 °) to the orientation axis and the angle θ and the plurality of inclined reinforcing fiber sheets A plurality of inclined reinforcing fiber sheets are produced by inclining and cutting at a width determined by the width of the reinforcing fiber sheet, or the plurality of inclined reinforcing fiber sheets or the plurality of spread fiber reinforced fiber bundles. Two or more types having different orientation angles are selected from the sheet or tape on which the inclined reinforcing fiber sheet is surface bonded and the reinforcing fiber sheet, which are surface-bonded to the reinforcing fiber tapes arranged in parallel and arranged in a plane. And the selected orientation Formed by joining integrally laminating degrees different sheets,
A multiaxial laminated reinforcing fiber sheet characterized by that.

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