JP2005238517A - Tubular laminate having nonwoven fabric and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a tubular laminate excellent in strength, durability, a surface grade and design effect at a low cost by enhancing process passing properties of lamination, and the tubular laminate excellent in strength, durability surface grade and design effect and suitably usable as a golf club shaft or the like. <P>SOLUTION: In the tubular laminate manufacturing method, a plurality of unidirectional prepregs reinforced by reinforcing fiber bundles arranged in one direction are laminated in a tubular form so that the directions of the reinforcing fiber bundles are different from each other and reinforcing fiber bundles mutually arranged in a warp direction, a weft direction, an oblique direction and a reversely inclined direction are laminated and mutually bonded to form a nonwoven fabric. Nonwoven fabric prepregs, each of which is reinforced by the nonwoven fabric, are laminated and heated to the reaction temperature of the unidirectional prepreg and the nonwoven prepregs or above to manufacture the tubular laminate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tubular laminated body including a nonwoven fabric, which is a fiber-reinforced composite material using carbon fibers or the like as reinforcing fibers, a manufacturing method thereof, and a golf club shaft.

  Fiber reinforced composite materials using continuous fibers such as carbon fibers as reinforcing fibers are generally woven layers reinforced with woven bundles of reinforced fibers or unidirectional layers reinforced with bundles of reinforced fibers aligned in one direction. Have a laminated structure. In particular, a tubular laminate, which is a fiber-reinforced composite material having a high level of demand for weight reduction, such as a golf club shaft and a fishing rod, is mainly composed of a unidirectional layer.

  Tubular laminates composed of unidirectional layers are thermosetting by laminating multiple unidirectional prepregs, which are impregnated with a thermosetting resin into reinforcing fiber bundles aligned in one direction, and heating them. It is generally manufactured by a method of curing a resin.

  And since a unidirectional layer has anisotropy regarding intensity | strength and rigidity, in order to provide the appropriate intensity | strength and rigidity with respect to each stress direction, a tubular laminated body usually differs in the direction of a reinforced fiber bundle mutually. The plurality of unidirectional layers are combined and laminated.

  However, in order to obtain such a tubular laminate, it is necessary to cut out a large number of unidirectional prepregs having different directions, shapes, sizes, etc. of the reinforcing fiber bundles and to laminate them with high accuracy, and the process is complicated. Therefore, improvements are desired in terms of manufacturing speed and yield.

Therefore, for example, in the application of a golf club shaft, a method of obtaining a tubular laminate by a simpler process by introducing a fabric layer using a fabric prepreg using a multiaxial fabric has been proposed (for example, patents). Reference 1).
JP 2000-245880 A

  However, when using a woven prepreg, the number of steps when laminating may be reduced compared to when using only a unidirectional prepreg, but because of its low flexibility and poor formability, the laminating step There is a problem that the permeability is rather lowered or a defect may occur in the obtained material.

  In particular, when producing a tubular laminate having a large curvature, such as a golf club shaft, if the flexibility of the prepreg is inferior, it may not be possible to laminate the tube itself, even if it can be laminated. In the obtained tubular laminate, defects such as local undulation, wrinkles and the like are likely to be caused. Such defects may significantly reduce the strength and durability of the tubular laminate.

  In addition, the laminated body in which a layer that can visually recognize the state in which reinforcing fiber bundles cross like a woven layer is laminated on the outermost layer is said to be excellent in design, but when a woven prepreg is laminated on the outermost layer It has been difficult to obtain a tubular laminate having a surface quality at a level that does not cause any practical problems.

  The present invention has been made in view of the above circumstances, and is a production method that can improve the processability of lamination and can produce a tubular laminate excellent in strength, durability, surface quality, and design at low cost. In addition, an object of the present invention is to provide a tubular laminate that is excellent in strength, durability, surface quality, and design and can be suitably used for a golf club shaft or the like.

  In order to achieve the above object, the method for producing a tubular laminate of the present invention is a method of forming a unidirectional prepreg reinforced with a reinforced fiber bundle aligned in one direction into a tubular shape so that the directions of the reinforced fiber bundles are different from each other. Laminating a plurality of laminated layers, and further laminating non-woven prepregs reinforced with non-woven fabrics laminated to each other in a longitudinal direction, a weft direction, an oblique direction, and a reverse oblique direction, and bonded to each other. It heats more than the reaction temperature of a prepreg and the said nonwoven fabric prepreg, It is characterized by the above-mentioned.

  Since the nonwoven fabric prepreg used in this manufacturing method is excellent in flexibility, it can be easily laminated in a tubular shape along the curved surface, and the workability of the lamination is improved. Moreover, generation | occurrence | production of defects, such as a void, in the tubular laminated body obtained is suppressed, and the intensity | strength and durability reduce significantly. This is thought to be because, in the case of a nonwoven fabric, since the impregnation of the thermosetting resin is easier than that of the woven fabric, the amount of air brought in as an unimpregnated portion of the prepreg is reduced.

  Furthermore, by laminating the nonwoven fabric prepreg on the outermost layer, a tubular laminate having excellent design properties and good surface quality such as smoothness can be obtained. In the case of a woven prepreg, since the amount of resin in the vicinity of the surface of the tubular laminate is small, the resin sinks at the portion of the weave, so that defects such as so-called pits are likely to occur. The amount of resin in the vicinity of the surface of the tubular laminate can be increased, and the occurrence of defects on the surface such as pits can be suppressed.

  It is preferable that the nonwoven fabric used for the said manufacturing method is a nonwoven fabric formed by adhere | attaching the reinforced fiber bundles arranged together with the thermoplastic resin fiber.

  Thereby, the impregnation property of the thermosetting resin to the nonwoven fabric is further improved. Moreover, since the nonwoven fabric prepreg which has moderate softness | flexibility and is excellent also in shape stability is obtained, the workability | operativity in a lamination process is further improved.

  In the production method of the present invention, the reinforcing fiber bundle of the nonwoven fabric is preferably made of carbon fibers. By using carbon fiber, the obtained tubular laminate can be further reduced in weight, and the design of the tubular laminate can be enhanced.

  The tubular laminate of the present invention is a tubular laminate obtained by the above-described production method, and the strength and rigidity against twisting, bending, and crushing stress are increased without significant weight increase.

  In addition, since it is easy to increase the resin content in the nonwoven fabric layer, the tubular laminate of the present invention has good surface quality and excellent design.

  In the tubular laminate of the present invention, the reinforcing fiber bundles of the nonwoven fabric are preferably bonded with thermoplastic resin fibers. Thereby, the local disturbance of the arrangement | sequence of a reinforced fiber bundle is suppressed, and the intensity | strength and durability of a tubular laminated body are further improved.

  Moreover, by using the carbon fiber as the reinforcing fiber bundle of the nonwoven fabric, the tubular laminate can be further reduced in weight, and high-quality design can be obtained.

  The golf club shaft of the present invention is characterized by comprising the tubular laminate of the present invention, and has high strength and rigidity in each mode of twisting, bending and crushing while being lightweight, and Also, it has excellent surface smoothness and design.

  Furthermore, the golf club shaft of the present invention is excellent in feel when a golf ball is hit. This is presumably because the vibration damping property of the golf club shaft was improved due to the increase in the resin content in the vicinity of the surface due to the nonwoven fabric prepreg being arranged in the outermost layer.

  According to the present invention, a method for producing a tubular laminate capable of improving the processability of lamination and producing a tubular laminate excellent in strength, durability, surface quality, and designability at low cost, and strength. In addition, a tubular laminate that is excellent in durability, surface quality, and design properties and can be suitably used for a golf club shaft or the like is obtained.

  Hereinafter, embodiments of the tubular laminate according to the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

  FIG. 1 is a perspective view schematically showing a tubular laminate according to the present embodiment. However, for the sake of explanation, the layers constituting the tubular laminate are illustrated so that the layers can be seen, but in the present embodiment, the layers are laminated over the entire length of the tubular laminate.

  A tubular laminate 200 shown in FIG. 1 includes a bias layer 40 and a straight layer 50 as unidirectional layers, and a non-woven fabric layer 60 disposed outside the straight layer 50 and laminated on the outermost layer of the tubular laminate 200. .

  The nonwoven fabric layer 60 includes the nonwoven fabric 100 illustrated in FIG. 2 and a resin impregnated in the nonwoven fabric 100. The tubular laminate 200 does not necessarily include only one nonwoven fabric layer as in this embodiment, and may include a plurality of nonwoven fabric layers.

  Further, the nonwoven fabric layer 60 may not be laminated over the entire length of the tubular laminate 200. For example, when the tubular laminate 200 is used for a golf club shaft, the nonwoven fabric layer 60 may be laminated only in the vicinity of the grip portion, or conversely, may be laminated only in the vicinity of the head portion.

  Further, in addition to the outermost layer, the nonwoven fabric layer 60 may be laminated at a position other than the outermost layer, for example, between the bias layer 40 and the straight layer 50.

  As shown in FIG. 2, the nonwoven fabric 100 included in the nonwoven fabric layer 60 has a first fiber bundle layer composed of a plurality of warps 11 aligned in one direction and a direction (warp direction) of the warps 11 of 0. And a second fiber bundle layer composed of a plurality of weft yarns 12 aligned in the 90 ° direction (weft direction) and a plurality of diagonal lines aligned in the −45 ° direction (oblique direction). A third fiber bundle layer composed of the spun yarn 13; a fourth fiber bundle layer composed of a plurality of oblique yarns 14 aligned in the + 45 ° direction (reverse oblique direction); and a 90 ° direction (the weft direction). ) And a sixth fiber layer composed of a plurality of warp yarns 16 aligned in the direction of 0 ° (warp direction), in this order. It has a stacked configuration. The warp yarns 11 and 16, the weft yarns 12 and 15, and the oblique yarns 13 and 14 are each composed of a reinforcing fiber bundle.

  And the warps 11 and 16 which comprise the 1st fiber bundle layer and the 6th fiber bundle layer laminated | stacked on the outermost layer of the nonwoven fabric 100 are staggered when seen from the direction perpendicular | vertical to the main surface of the nonwoven fabric 100. Are arranged so that the weft and the oblique yarn are sandwiched. Such sandwiching is preferable from the viewpoint of preventing misalignment in the nonwoven fabric 100.

  In the nonwoven fabric 100, the reinforcing fiber bundles do not necessarily have to be arranged at the angles as described above. However, when the direction of the warps 11 and 16 (warp direction) is 0 °, the direction of the wefts 12 and 15 (weft) Direction) is preferably 80 ° to 100 °, and the directions of the oblique yarns 13 and 14 (oblique direction and reverse oblique direction) are −35 ° to −55 ° and 35 ° to 55 °, respectively. preferable.

  For example, the nonwoven fabric 100 in which the reinforcing fiber bundles are aligned so as to have an angle in such a range is laminated so that the directions of the warp yarns 11 and 16 coincide with the axial direction of the tubular laminate 200. The strength and rigidity against bending, twisting and crushing of the body 200 can be efficiently increased. At this time, in the tubular laminate 200, the bending stress in the central axis is perpendicular to the central axis, and the warp yarns 11 and 16 are perpendicular to the central axis in the rotational direction around the central axis (torsional stress). The compressive stress (crushing stress) in the direction is mainly borne by the wefts 12 and 15, respectively.

  Further, when the nonwoven fabric 100 is regarded as a planar lattice, the positions (lattice points) at which the reinforcing fiber bundles cross each other are not necessarily fixed. For example, the lattice points formed by the first and second fiber bundle layers and the lattice points formed by the second and third fiber bundle layers may be different from each other in the lattice plane.

  Examples of the reinforcing fiber bundle used for the nonwoven fabric 100 include glass fiber, carbon fiber, alumina fiber, and aramid fiber, and these can be used alone or in combination. Among these, it is preferable to use carbon fiber in terms of weight reduction of the tubular laminate, design properties, and the like. In particular, in order to reduce the weight of the tubular laminate, the tensile elastic modulus of the carbon fiber used for the nonwoven fabric 100 is preferably 100 to 800 GPa, and the tensile strength is preferably 2000 to 7000 MPa.

  The number of filaments constituting the reinforcing fiber bundle used in the nonwoven fabric 100 is preferably 500 to 24000, more preferably 1000 to 6000. In each fiber bundle layer, the reinforcing fiber bundles are preferably arranged at a density in the range of 1 to 25 fibers / 25 mm. However, when there are a plurality of fiber bundle layers that are alternately arranged in the same direction, such as the first fiber bundle layer and the sixth fiber bundle layer, the total density of the reinforcing fiber bundles they have is 1 It is preferable that it is -25 pieces / 25mm. By setting the number of filaments and the density in such a range, the interval between the reinforcing fiber bundles is widened, and the freedom of movement of the reinforcing fiber bundles is increased. Accordingly, the reinforcing fiber bundle is easy to move, and the flexibility of the nonwoven fabric prepreg is further increased. Moreover, it becomes easy to enlarge resin content in a nonwoven fabric layer because resin fills the clearance gap between reinforcement fiber bundles. When the resin content is large, a tubular laminate having good surface smoothness can be easily obtained, and when the tubular laminate is used for a golf club shaft, a good feel can be obtained.

  When using a woven fabric of reinforcing fiber bundles as in the past, if the spacing between the reinforcing fiber bundles is increased as described above, misalignment is likely to occur, and the strength and design of the resulting tubular laminate are impaired. In many cases, such a problem is less likely to occur when the nonwoven fabric 100 as described above is used.

  In the nonwoven fabric 100, for example, the reinforcing fiber bundles are bonded to each other in the fiber bundle layers that overlap each other like the first and second fiber bundle layers. By bonding the reinforcing fiber bundles to each other, a form as a nonwoven fabric in which a plurality of reinforcing fiber bundles are gathered is maintained.

  Specifically, for example, as shown in FIG. 3, a first fiber bundle layer 21 made of warp 11 and a second fiber bundle layer 22 made of weft 12 are bonded to each other by thermoplastic resin fibers 30. ing. The thermoplastic resin fibers 30 are attached along the weft yarns 12, and the warp yarns 11 and the weft yarns 12 are bonded by interposing the thermoplastic resin fibers 30 therebetween.

  As described above, the nonwoven fabric in which the fiber bundle layers are bonded to each other via the thermoplastic resin fibers has an appropriate flexibility, has good resin impregnation properties, and has no misalignment when the prepreg is laminated. It is difficult to cause problems such as occurrence.

  As the thermoplastic resin fiber 30, for example, a fiber such as copolymer nylon, copolymer polyester, or copolymer acrylate can be used. As the copolymer nylon, a copolymer using at least one selected from the group consisting of nylon 6, nylon 66, nylon 12, and nylon 610 can be suitably used.

  The thermoplastic resin fiber 30 is usually a fiber bundle composed of a plurality of filaments, and the thickness thereof is preferably 2 to 50 TEX, and more preferably 3 to 20 TEX. If the thermoplastic resin fiber 30 is less than 2 TEX, the adhesive strength between the fiber bundle layers may not be sufficient, and if it exceeds 50 TEX, the flexibility of the nonwoven fabric prepreg tends to decrease.

  The amount of the thermoplastic resin fiber 30 used is preferably 0.4 to 10% by weight, and 2 to 5% by weight with respect to 100% by weight of the total amount of the reinforcing fiber bundle and the thermoplastic resin fiber 30 in the nonwoven fabric 100. It is more preferable that If the amount of the thermoplastic resin fiber 30 is less than 0.4% by weight, the adhesive strength between the reinforcing fiber bundles may not be sufficient. If it exceeds 10% by weight, the resin impregnation into the nonwoven fabric and the flexibility of the nonwoven fabric prepreg Tend to decrease.

  In the case of the nonwoven fabric 100, the thermoplastic resin fibers 30 are used. However, as a modified embodiment of the present embodiment, instead of this, a nonwoven fabric in which reinforcing fiber bundles are bonded via thermoplastic resin particles is used. You can also.

  Non-woven fabric 100 is, for example, a fiber bundle layer formed by aligning reinforcing fiber bundles and thermoplastic resin fibers in a predetermined direction, layered while sequentially changing the alignment direction, and then stacked in layers It is obtained by a method of adhering fiber bundle layers by heating and pressurizing a laminate comprising bundle layers.

  Since the nonwoven fabric 100 can be manufactured by such a manufacturing method, the nonwoven fabric 100 can be efficiently manufactured in an extremely short time as compared with a woven fabric of reinforcing fiber bundles.

  In the nonwoven fabric layer 60, the resin impregnated in the nonwoven fabric 100 may be a cured product of a thermosetting resin or a thermoplastic resin. However, from the viewpoint of workability of a lamination process for obtaining the tubular laminate 200, etc. A cured product of a thermosetting resin is preferable. In the nonwoven fabric layer 60, the resin does not necessarily need to be completely impregnated into the reinforcing fiber bundle, and the resin is not impregnated so that the strength and the like of the tubular laminate 200 are not significantly impaired. Part and voids in the layer may be contained in a small amount.

  Examples of the thermosetting resin include an epoxy resin, a vinyl ester resin, an unsaturated polyester resin, and a phenol resin. Among these, when the reinforcing fiber bundle is made of carbon fiber, an epoxy resin is preferable from the viewpoint of adhesiveness between the reinforcing fiber and the resin.

  In the nonwoven fabric layer 60, the ratio (resin content) of the resin to the total amount of the reinforcing fiber bundle and the resin of 100% by weight (resin content) is preferably 20 to 60% by weight, and more preferably 30 to 40% by weight. . When the resin content is less than 20% by weight, the surface smoothness of the tubular laminate 200 tends to be insufficient, and when it exceeds 60% by weight, the tubular laminate 200 tends to be heavy.

  The bias layer 40 bears stress in the rotational direction (torsional stress) around the central axis of the tubular laminate 200, and the straight layer 50 bears bending stress (bending stress) in the central axis direction of the tubular laminate 200, respectively. The main purpose is to do.

  The bias layer 40 includes a + 45 ° layer 41, a −45 ° layer 42, a + 45 ° layer 43, and a −45 ° layer 44 in this order from the inside of the tubular laminate. Each of these layers is a bundle of reinforcing fibers that are aligned along the circumferential direction of the cross section of the tubular laminate that forms angles of + 45 °, −45 °, + 45 °, and −45 ° with respect to the axial direction of the tubular laminate 200, respectively. And a resin impregnated therein.

  The straight layer 50 includes a reinforcing fiber bundle aligned in a direction of 0 ° with respect to the axial direction of the tubular laminate and a resin impregnated therein, and the 0 ° layers 51 and 52 are in this order. It has a stacked configuration.

  The tubular laminate of the present invention only needs to include unidirectional layers in which the directions of the reinforcing fiber bundles are different from each other as in the relationship between the straight layer and the bias layer. As in 52, a plurality of unidirectional layers having the same direction of the reinforcing fiber bundle may be further provided.

  The direction of the reinforcing fiber bundle in the bias layer 40 and the straight layer 50 is not limited to the above, but it is preferably 15 ° to 75 ° in the bias layer with respect to the axial direction of the tubular laminate. In the straight layer, it is preferably 0 ° to 10 °.

  Examples of the reinforcing fiber bundle constituting the bias layer 40 and the straight layer 50 include glass fiber, carbon fiber, alumina fiber, and aramid fiber, and these can be used alone or in combination. Among these, it is preferable to use carbon fiber in terms of weight reduction of the tubular laminate.

  In particular, in order to reduce the weight of the tubular laminate, it is preferable that the carbon fiber used for the bias layer 40 and the straight layer 50 has a tensile modulus of 100 to 800 GPa and a tensile strength of 2000 to 7000 MPa.

  As the resin impregnated in the unidirectional layer in the bias layer 40 and the straight layer 50, the same materials as those described above with respect to the resin contained in the nonwoven fabric layer 60 are preferably employed. Even in these unidirectional layers, it is not always necessary that the resin is completely impregnated into the reinforcing fiber bundle, and the non-impregnated portion and voids (voids) are not affected so that the strength of the tubular laminate 200 is not significantly impaired. ) May be present.

  The amount of the resin constituting the bias layer 40 and the straight layer 50 is 20 to 60 with respect to 100% by weight of the total amount of the reinforcing fiber bundle and the resin in each layer from the viewpoint of the balance of the strength and weight of the tubular laminate 200. It is preferable that it is weight%.

  In the present embodiment, the bias layer 40 and the straight layer 50 are each composed of four layers and two layers. However, the number of layers is not limited to this, and the bias layer is 1 to 1 in the diagonal direction and the reverse diagonal direction. The straight layer is preferably composed of 1 to 8 layers.

  Further, the number of layers on which the bias layer 40 and the straight layer 50 are laminated may not be the same over the entire length of the tubular laminate 200. For example, when the tubular laminate 200 is used for a golf club shaft, the number of layers to be laminated may be larger than that of other portions, particularly in the vicinity of the head portion where a large stress load is applied.

  The length, outer diameter, thickness and the like of the tubular laminate 200 are not particularly limited, and may be adjusted as appropriate according to the application. When used for a golf club shaft, the tubular laminate 200 preferably has a taper with an outer diameter decreasing along the longitudinal direction.

  The tubular laminate 200 having the above-described configuration is normally used for golf club shafts, fishing rods, ski poles, climbing sticks, etc., with its surface coated and provided with a paint layer. it can. By using the tubular laminate 200, it is possible to obtain these sports / leisure products that are lightweight, have high strength, and are excellent in design.

  In particular, the golf club shaft made of the tubular laminate 200 can obtain a good feel (feel) when used for a driver or the like.

  The tubular laminate 200 is preferably manufactured by a method of laminating a plurality of unidirectional prepregs into a tubular shape, further laminating a non-woven fabric prepreg reinforced with the non-woven fabric 100, and heating the unidirectional prepreg and the non-woven prepreg to a reaction temperature or higher. can do.

  The unidirectional prepreg and the nonwoven fabric prepreg can be laminated by being wound into a tubular shape by a sheet winding method. That is, a sheet of unidirectional prepreg and non-woven prepreg that has been cut out in a predetermined shape and in the direction of the reinforcing fiber bundle is placed on a cored bar made of stainless steel or the like so that the directions of the reinforcing fiber bundle are different from each other. A unidirectional prepreg is sequentially wound and laminated, and then a nonwoven fabric prepreg is wound and laminated as an outermost layer on the outer side to obtain a tubular prepreg laminate.

  The unidirectional prepreg used in the lamination is, for example, by laminating a film-like thermosetting resin applied on a release paper on one or both sides of a reinforcing fiber bundle aligned in one direction, and heating it through the release paper. And a method of impregnating the reinforcing fiber bundle layer with a thermosetting resin by pressurization.

  Further, the nonwoven fabric prepreg can be obtained by impregnating the nonwoven fabric 100 with a thermosetting resin by the same method as the unidirectional prepreg.

  As the thermosetting resin, an epoxy resin can be suitably used. In this case, other components such as an epoxy resin curing agent and curing accelerator, a thermoplastic resin, and an elastomer are mixed with the epoxy resin. The dissolved thermosetting resin composition can be impregnated.

  Next, the thermosetting resin is cured by heating the entire prepreg laminate obtained as described above to a reaction temperature or higher of these prepregs, and the cored bar is removed to obtain the tubular laminate 200.

  The heating temperature is appropriately determined within a temperature range in which the thermosetting resin impregnated in the prepreg reacts and can be cured to an extent that causes no practical problem. In the case of an epoxy resin, the heating temperature may usually be 100 to 180 ° C., and at this time, the heating time is preferably in the range of 0.5 to 5 hours.

  In the heating step, in order to suppress the generation of voids (voids) inside the tubular laminate 200, it is preferable to heat the prepreg laminate while applying pressure. The prepreg laminate can be pressurized by, for example, winding a tape made of a heat-shrinkable thermoplastic resin such as stretched polyethylene terephthalate.

  Further, the obtained tubular laminate 200 is preferably ground and then coated to obtain a golf club shaft or the like.

It is a perspective view which shows one Embodiment of the tubular laminated body by this invention. It is a top view which shows the nonwoven fabric used for the tubular laminated body shown in FIG. It is a perspective view which shows a part of nonwoven fabric shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Warp, 12 ... Weft, 13, 14 ... Oblique yarn, 15 ... Weft, 16 ... Warp, 21 ... First fiber bundle layer, 22 ... Second fiber bundle layer, 30 ... Thermoplastic resin fiber, 40 ... Bias layer, 41 ... + 45 ° layer, 42 ...- 45 ° layer, 43 ... + 45 ° layer, 44 ...- 45 ° layer, 50 ... straight layer, 51,52 ... 0 ° layer, 60 ... nonwoven fabric layer, 100 ... Nonwoven fabric, 200 ... tubular laminate.

Claims (7)

A plurality of unidirectional prepregs reinforced with a bundle of reinforcing fibers aligned in one direction are laminated in a tubular manner so that the directions of the reinforcing fiber bundles are different from each other,
Furthermore, laminated non-woven prepregs reinforced with non-woven fabric bonded together by laminating reinforcing fiber bundles aligned in the warp direction, weft direction, diagonal direction and reverse diagonal direction,
The manufacturing method of a tubular laminated body which heats more than the reaction temperature of the said unidirectional prepreg and the said nonwoven fabric prepreg.   The said nonwoven fabric is a manufacturing method of the tubular laminated body of Claim 1 which is the nonwoven fabric formed by adhere | attaching the reinforced fiber bundles arranged together with the thermoplastic resin fiber.   The manufacturing method of the tubular laminated body of Claim 1 or 2 with which the reinforced fiber bundle of the said nonwoven fabric consists of carbon fibers. A plurality of unidirectional prepregs reinforced with a bundle of reinforcing fibers aligned in one direction are laminated in a tubular manner so that the directions of the reinforcing fiber bundles are different from each other,
Furthermore, laminated non-woven prepregs reinforced with non-woven fabric bonded together by laminating reinforcing fiber bundles aligned in the warp direction, weft direction, diagonal direction and reverse diagonal direction,
A tubular laminate obtained by heating to a temperature higher than the reaction temperature of the unidirectional prepreg and the nonwoven fabric prepreg.   The tubular laminate according to claim 4, wherein the nonwoven fabric is a nonwoven fabric formed by adhering bundled reinforcing fiber bundles with thermoplastic resin fibers.   The tubular laminate according to claim 4 or 5, wherein the reinforcing fiber bundle of the nonwoven fabric is made of carbon fiber. A golf club shaft comprising the tubular laminate according to any one of claims 4 to 6.

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