JP2010253733A - Method of manufacturing pultrusion molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a lightweight shaft product for transportation which is excellent in vibration resistance by using a plurality of sheets of allocation fixtures and a threading method of them and performing opening of a plurality of fiber bundles. <P>SOLUTION: The method of manufacturing pultrusion molded article comprises processes of: impregnating the plurality of fiber bundles played out of a bobbin 2 with a heat-curable resin composition in a resin bath 4; and, thereafter, causing the plurality of fiber bundles impregnated with a thermosetting resin composition to pass through a die 6 via the allocation fixtures 5 for allocating the fiber bundles evenly and, at the same time, curing the resin composition, wherein the plurality of sheets of allocation fixtures 5 are used and the threading is performed such that the fiber bundles are opened from different directions by the respective allocation fixtures 5 (5a to 5d). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a pultruded product that is a manufacturing material for a transport shaft used for transporting a liquid crystal panel or the like, and in particular, a lightweight pultrusion molding with little warpage and a small transport shaft amplitude. The present invention relates to a method for manufacturing a product.

  The pultruded product is widely used for a transport shaft used in a transport device for electronic parts such as a printed circuit board, a liquid crystal, and a shadow mask. Conventionally, it has been common to use a metal with high rigidity for the transport shaft. However, as the size of the device increases, it is necessary to reduce the weight more than before, and use reinforcing fibers such as carbon fiber as the base material. Hollow pultruded products molded with epoxy resins have been used.

  Such a cylindrical hollow conveying shaft product cannot convey a conveyance object such as a printed circuit board or a liquid crystal panel straight when the amount of deflection when the conveying shaft rotates is large, Glass substrates such as liquid crystal panels may be damaged.

  In recent years, due to the expansion of the panel size, the conveying shaft has a tendency to become longer, and in order to improve productivity, the conveying speed tends to be increased (the rotating speed of the conveying shaft is increased). The effect of the amount of runout during rotation on the production efficiency of products is increasing.

  By the way, until now, molded products with glass fiber and carbon fiber drawing impregnated and cured with thermosetting resin have been manufactured by the hand layup method and filament winding method, but the hand layup method is a manual operation. In addition, since the filament winding method has a complicated process, the productivity is inferior and the molding cost is high.

  Therefore, a method of manufacturing a conveyance shaft by impregnating a glass fiber bundle converged from a plurality of glass fibers with a thermosetting resin composition and performing pultrusion has been proposed and performed ( For example, see Patent Document 1.)

  In addition, before introducing the reinforcing fiber into the mold, it can be passed through one allocating jig and then the inlet of the mold drawing passage so that the tensile strength of the pultruded product can be improved and the conveyance can be performed stably. Reinforcing fiber by introducing it into the drawing passage in a state where each reinforcing fiber is aligned in parallel with each other through a die having a shape substantially similar to the shape of A method for reducing the degree of meandering has been proposed (see, for example, Patent Document 2).

  In addition, although it is a manufacturing method of a fine filament like an optical fiber, it tries to obtain the shape of an FRP fine filament with high precision by running and impregnating and converging a plurality of fiber bundles spirally. A method has also been proposed (see, for example, Patent Document 3).

JP 2007-255507 A JP 2002-160303 A JP 2000-254978 A

  However, the manufacturing method in which the degree of meandering as in Patent Document 2 is reduced is effective in improving the tensile strength of the molded product, but the shape is stable so as to reduce the amount of runout required for the conveying shaft. Sex was insufficient. Further, the manufacturing method in which the optical fiber as in Patent Document 3 is spirally run is intended to eliminate the anisotropy of the spring back of the fine filaments, It was not intended to suppress runout during rotation.

  As described above, in addition to the strength and weight reduction that have been issues to date, it has become a major challenge to prevent the amount of warping, twisting, and run-out during conveyance more than ever. ing.

  Accordingly, the object of the present invention is to provide a method for producing a pultruded product that eliminates non-uniformity of a plurality of fiber bundles and is excellent in runout resistance, and is suitable for a lightweight transport shaft. is there.

  As a result of diligent investigations to solve the above problems, the present inventors have devised a method for passing a fiber bundle impregnated with a thermosetting resin composition using a plurality of allocating jigs. By opening the fiber bundle and curing it while passing it through the mold and performing pultrusion molding, the reinforcing fibers are evenly distributed in the cross-sectional direction, and the molded product has less amplitude even when rotated And the present invention has been completed.

  That is, in the method for producing a pultruded product of the present invention, after impregnating a thermosetting resin composition into a plurality of fiber bundles, each fiber bundle is used as a guide hole of an allocation jig having a plurality of guide holes. A method of manufacturing a pultruded product that is guided through a mold and cured while passing through the mold, wherein a plurality of allocation jigs are arranged at predetermined intervals along the path of the fiber bundle. Each fiber bundle is threaded at a predetermined angle so as to be pressed against the side surface of the guide hole of each allocating jig.

  The allocating jig used here distributes the fiber bundles evenly and guides the fiber bundles uniformly into the mold so that the fiber bundles are present in the pultruded product without unevenness. This allocating jig preferably has a plurality of guide holes at equal intervals on the circumference that is equidistant from the center thereof. In the present invention, a plurality of allocating jigs are used before being drawn into the mold. In addition, the fiber bundle is efficiently opened. At this time, as a method for passing the fiber bundle from the first assignment jig to the last assignment jig, it is preferable that the fiber bundle travels in a spiral shape.

  When the fiber bundle is run spirally, the fiber bundle impregnated with the thermosetting resin composition passes through the guide hole of the first assignment jig and then guides the next assignment jig. The position of the hole is shifted so that the fiber bundle is not drawn straight into the mold. In this case, the fiber bundle passes through the guide hole at a predetermined angle, and at this time, the fiber bundle is pressed against the side surface of the guide hole. And also in the guide hole of the next allocating jig, the fiber bundle is pressed against the side surface of the guide hole and the fiber bundle is subjected to pressure from a plurality of different directions so that the fiber The bundle is opened and made uniform.

  In this way, by opening with a plurality of pressures from different directions, non-uniformity can be efficiently eliminated. At this time, as a guide hole through which a certain fiber bundle passes, the guide hole of one allocation jig was shifted from the guide hole of the next allocation jig to rotate in the same direction with respect to the center of the allocation jig. When the position is shifted to the position and the next allocation jig is shifted in the same manner, the fiber bundle is threaded through the allocation jig so as to draw a locus in a spiral shape and drawn into the mold.

  At this time, in order for the fiber bundle to be threaded to draw a spiral shape, at least three allocation jigs are used, and preferably 4 to 8 are used, each time passing through the allocation jig. It is preferable to shift the position so that an angle is formed, and draw a spiral trajectory of just one rotation when the fiber bundle passes from the first allocation jig to the last allocation jig. Even if the rotation is less than one rotation at this time, if the extended locus is a spiral, it is included in the spiral in this specification.

  In addition, the spiral shape in the present specification has a broad meaning including the state of a fiber bundle that is guided to rotate while twisting in the same direction around the center axis passing through the centers of the plurality of allocating jigs. It is. In order to guide the fiber bundle in a spiral shape, it is preferable to arrange the guide holes of the allocating jig so as to be on the locus of the spiral, and it is optimal to arrange the allocating jigs at equal intervals.

  When the allocating jig is equally spaced, the guide holes through which the fiber bundles pass are placed on the spiral trajectory so that they all rotate in the same direction and at the same angle from one guide hole to the next guide hole. In this case, since the pressure applied to the fiber bundle from the guide hole becomes almost equal, a preferable result can be obtained for uniformizing the fiber bundle.

  According to the method for producing a pultruded product of the present invention, it is possible to produce a pultruded product with less warping and excellent vibration resistance. For example, an extremely reliable product when used as a conveying shaft It can be.

It is the schematic block diagram which showed the manufacturing apparatus of the pultruded product used for the manufacturing method of the pultruded product of this invention. It is the figure which showed an example of the threading method to the allocation jig | tool of a fiber bundle in the manufacturing apparatus of the pultruded product of FIG. It is a sectional side view of the metal mold | die 6 shown in FIG. FIG. 4 is a side view of the inner core jig 62 of the mold shown in FIG. 3. FIG. 5 is a front view of an inner core jig 62 of the mold shown in FIG. 4.

Hereinafter, the present invention will be described in detail.
The pultruded product manufacturing method of the present invention is carried out by the pultruded product manufacturing apparatus shown in FIG. 1, and can produce a pultruded product that is less warped and twisted and has excellent vibration resistance.

  FIG. 1 shows a schematic configuration diagram of a pultruded product manufacturing apparatus. The pultruded product manufacturing apparatus 1 includes a bobbin 2, a guide roll 3, a resin bath 4, an allocation jig 5 ( 5a to 5d), a mold 6, and a belt conveyor 7.

  The bobbin 2 rotates to supply a fiber bundle. The plurality of wound fiber bundles are immersed in the resin in the resin bath 4 through the guide roll 3 and impregnated with the thermosetting resin composition.

  The fiber bundle to which the thermosetting resin composition is adhered is guided to the allocating jig 5 and drawn into the mold 6, and the molded product cured by the mold 6 is pulled out by the belt conveyor 7 to obtain a pultruded molded product. At this time, the allocating jig 5 has a plurality of guide holes at equal intervals on the circumference that is equidistant from the center thereof, and the fiber bundle is evenly distributed on the mold through the allocating jig 5. Can be pulled into. If it does in this way, the fiber bundle in a pultruded product will be allocated equally, and the pultruded product suitable for the shaft for conveyance with few curvature and torsion will be obtained.

  Pulling a fiber bundle into a mold using an allocating jig has been performed in the past and is not new at all. The bundle was not sufficiently opened, and in this case, the non-uniformity due to the flattening of the fiber bundle in a specific direction was the biggest cause that the vibration of the resulting conveying shaft could not be suppressed.

  Therefore, in the present invention, a plurality of the assignment jigs 5 are used, and the fiber bundles are pressed against the side surfaces of the guide holes of the assignment jig when the fiber bundles pass through the guide holes of the assignment jig 5. By doing so, the fiber bundle before being drawn into the mold is threaded so that the fiber bundle is opened and made uniform.

  As a specific method of pressing, each fiber bundle may be threaded through the guide hole of the allocating jig 5 at a predetermined angle, and more specifically, the fiber drawn into the guide hole of the allocating jig 5. There is a method in which the angle formed by the travel path of the bundle and the travel path of the fiber bundle drawn from the guide hole is equal to or greater than a predetermined angle. The angle formed at this time can be, for example, 15 ° or more, preferably 25 ° or more, and more preferably 45 ° or more.

  Further, at this time, it is preferable that the fiber bundle to be drawn is drawn obliquely so as to have a predetermined angle or more with respect to the axis of the guide hole. The angle of the fiber bundle with respect to the axis of the guide hole is preferably 10 ° or more, and more preferably 20 ° or more.

  By adopting such a configuration, the fiber bundle passes while being pressed against the side surface of the guide hole of the allocating jig 5, and at this time, the fiber bundle is opened or made uniform by the pressure received from the side surface.

  Next, the threading method in the manufacture of the pultruded product of the present invention will be described more specifically with reference to FIG. 2 showing the arrangement of the allocating jig and the traveling path of the fiber bundle.

  FIG. 2 shows an example in which four allocating jigs are used, and only one fiber bundle is displayed in order to explain what locus the fiber bundle travels. Here, FIG. 2A is a perspective view of the thread passing through the allocating jig 5, and FIG. 2B is a perspective view of the allocating jig 5 viewed from the allocating jig 5a side.

  The allocation jig actually used is provided with a plurality of guide holes at equal intervals on the circumference so as to be equidistant from the center. Although only one row is provided in FIG. 2, a plurality of rows may be provided, and in this case, it is preferably 1 to 3 rows. As shown in FIG. 2, one fiber bundle passes through the guide hole (0 o'clock position) of the first allocating jig 5a, and then the position is shifted clockwise in the second allocating jig 5b. Pass through the guide hole (position at 3 o'clock) and then sequentially pass through the guide holes shifted in the clockwise direction (position at 6 o'clock in the assignment jig 5c, position at 9 o'clock in the assignment jig 5d), Pass the guide hole.

  In this way, by shifting the passage position of the guide hole to a position different from the position corresponding to the guide hole of the allocating jig passed immediately before, a spiral travel path in which the carbon fiber bundle travels spirally is formed. And finally drawn into the mold 6.

  At this time, the number of allocation jigs to be used is determined by the shaft diameter and the number of filaments constituting the fiber bundle, but is preferably 3 or more, and more preferably 4 or more. The same effect can be obtained even if this is performed counterclockwise.

  The allocating jig 5 preferably has a thickness of 5 to 10 mm, and the material is not particularly limited as long as it can stably allocate the fiber bundle. Moreover, although the guide hole formed in the allocation jig | tool 5 is decided by the number of filaments which comprise a fiber bundle, it is preferable that a diameter is about 1-10 mm. When this diameter is smaller than 1 mm, workability is deteriorated, and when it is larger than 10 mm, the fiber bundle opening effect is limited, which is not preferable. Furthermore, it is preferable to form a guide hole with an inclination so as to gradually decrease from the bobbin side to the mold side, because it becomes easy to remove excess resin and improves the uniformity of the filament.

  Further, the fiber bundle used in the present invention is not particularly limited as long as it is a fiber base material capable of increasing the strength of the pultruded product. In addition to the properties, carbon fibers are preferred for applications that require flex resistance. Use of carbon fiber is also effective in reducing the weight.

  Examples of carbon fibers include PAN-based carbon fibers and pitch-based carbon fibers. In PAN-based carbon fibers, Best Fight HTA series (trade name) manufactured by Toho Tenax Co., Ltd. and Pyrofil (trade name) manufactured by Mitsubishi Rayon Co., Ltd. ) For pitch-based carbon fibers, use the GRANOC yarn YSH-A series, YS-A series, XN series (trade name) manufactured by Nippon Graphite Industries Co., Ltd., and Diamond Lead (trade name) manufactured by Mitsubishi Chemical Corporation. The selected one can be preferably used.

  As the fiber base material, a mixture of a plurality of types may be used. In particular, a mixture of carbon fiber characterized by a high elastic modulus and carbon fiber characterized by a high strength has a good load-deflection property and is preferable. Can be used. Further, all products using a combination of glass fiber on the inner side and carbon fiber on the outer peripheral side can be manufactured at a lower cost than when carbon fiber is used.

  The content of the fiber bundle is preferably 50 to 80% in terms of the average mass content (mass ratio) of the fiber base material in the molded product. If it is less than 50%, the rigidity of the molded product becomes poor, and if it exceeds 80%, a portion where the fiber reinforcing material is not impregnated with the resin composition is formed, and the physical properties of the pultruded product are deteriorated.

  The mixing of the thermosetting resin composition for pultrusion and the fiber bundle is preferably performed by impregnating the fiber bundle with the thermosetting resin composition so that the resin composition adheres to the fiber bundle. Since it is necessary for the fiber bundle to be able to withstand the drawing force at the time of pultrusion molding, it is preferable to use the structure of the fiber bundle with the roving of the fiber bundle oriented in the drawing direction.

  And in the manufacturing method of the pultruded product used here, a thermosetting resin composition varnish is impregnated into a fiber bundle obtained by converging a plurality of the above-described fibers, for example, 100 to 500 fiber yarns, The fiber reinforced resin composition is passed through a heating mold to cure the thermosetting resin composition, and the outer shape of the mold shape is adjusted and drawn to form a molded product. In this pultrusion molding, Depending on the resin composition to be used, the heating temperature and the drawing speed can be selected as appropriate.

  The carbon fiber used here is preferably subjected to sizing treatment with a silane coupling agent on the surface to maintain chemical resistance, and the sizing agent for performing this sizing treatment has low reactivity with an alkali component. Examples thereof include agents having good wettability with respect to the matrix resin. Specifically, a silane coupling agent such as methacryl silane or ureido silane or a mixture thereof is preferable.

  Next, the thermosetting resin composition used in the present invention can use a thermosetting resin such as an epoxy resin, a vinyl ester resin, or an unsaturated polyester resin as a base resin, and is preferably a vinyl ester resin.

  Examples of the thermosetting resin composition include (A) a vinyl ester resin, (B) a crosslinking agent, (C) a low shrinkage agent, (D) an inorganic filler, and (E) a release agent. (F) The thing containing an organic peroxide as an essential component is preferable.

  The (A) vinyl ester resin used in the present invention can be used without particular limitation as long as it is generally used as a molding material. For example, D-953 (Dainippon Ink Industries, Ltd., product) Name). Such (A) vinyl ester resin is obtained by reacting (a) an acidic component and (b) an epoxy resin component.

  Here, examples of the acid component (a) include unsaturated monobasic acids such as acrylic acid, methacrylic acid, crotonic acid, and sorbic acid, and phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, A mixture of two or more dibasic acids such as tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid, hexahydrophthalic anhydride, and adipic acid can also be used.

  In addition, as the (b) epoxy resin component, as long as it has two or more epoxy groups in one molecule, it can be widely used without being limited by molecular structure, molecular weight, etc. Specifically, Examples thereof include an epoxy resin having a bisphenol type, novolak type, or biphenyl type aromatic group, an epoxy resin obtained by polyglyconic acid glycidyl etherification, and an epoxy resin having an alicyclic group in which an epoxy group is condensed to a cyclohexane derivative. These epoxy resins can be used individually or in mixture of 2 or more types. Furthermore, as an epoxy resin component, in addition to these, a liquid monoepoxy resin can be used as a combined component as required.

  It is preferable that the compounding quantity of this (A) vinyl ester resin is the range of 70-85 mass% in a thermosetting resin composition.

  As the (B) cross-linking agent used in the present invention, any one having a double bond polymerizable with the (A) vinyl ester resin can be used. For example, styrene monomer, divinylbenzene, diallyl phthalate monomer, methacrylic acid Examples include methyl and triallyl isocyanurate. It is preferable that the compounding quantity of this (B) crosslinking agent is the range of 1-2 mass% in a thermosetting resin composition.

  As the (C) low shrinkage material used in the present invention, polyethylene resin, saturated polyester resin, rubber, polyethylene, etc., which are thermoplastic resins, can be used. From the viewpoint of chemical resistance, light weight, and low shrinkage, polyethylene is used. A resin is preferred. Among these, a polyethylene resin powder having a glass transition point of 70 to 120 ° C. is particularly preferable for improving chemical resistance and molding shrinkage. It is preferable that the compounding quantity of this (C) low shrinkage | contraction material is the range of 0.5-1.5 mass% in a thermosetting resin composition.

  Examples of the (D) inorganic filler used in the present invention include those usually used such as barium sulfate, calcium carbonate, aluminum hydroxide, silica, and glass balloon, and are not particularly limited. It is preferable that the compounding quantity of this (D) inorganic filler is the range of 10-20 mass% in a thermosetting resin composition.

  The (E) mold release agent used in the present invention may be any mold release agent that is usually used as a molding material. Examples thereof include commercially available silicone oils, and among these, epoxy-modified silicone oils are preferred. It is preferable that the compounding quantity of this (E) mold release agent is 0.01-2 mass% in a thermosetting resin composition.

  The organic peroxide (F) used in the present invention is not particularly limited as long as it is a compound that is usually used as a curing agent for vinyl ester resins, and examples thereof include benzoyl peroxide and di-t-butyl peroxide. And isobutyryl peroxide. It is preferable that the compounding quantity of this (F) organic peroxide is the range of 0.1-2 mass% in a thermosetting resin composition.

  As a result, the cured resin composition can be efficiently cured and molded with good operability. The molded product thus obtained can be made into a molded product with small volume shrinkage and excellent physical properties such as warping and twisting and appearance by mixing a low shrinkage agent.

  In this vinyl ester resin composition, when polyethylene is used as a low shrinkage material, it satisfies chemical resistance, light weight and dimensional stability, and can satisfy long-term reliability as a support product. Product can be manufactured. The same applies to the case where an unsaturated polyester resin is used as the base resin.

  Next, the mold 6 used in the present invention is not particularly limited as long as it is used in a conventionally used pultrusion molding. At this time, in order to obtain a pultruded product suitable for the conveying shaft, an outer mold 61 that forms the outer shape of the molded product as shown in FIGS. 3 to 5 and a hollow portion through which a cooling medium can pass. It is preferable that the die is composed of the sub jig 62.

  The core jig 62 is formed by passing a cooling medium through the hollow portion of the core jig main body 62a, thereby lowering the temperature of the heated core jig 62 and providing a temperature difference with the outer die 61. By producing a product, it is possible to obtain a pultruded product having a uniform wall thickness, high roundness, little warping and twisting, and excellent in light weight and molding shrinkage.

  The core jig 62 used in this manufacturing method has, for example, a core in which a hollow portion is formed with a pipe serving as a core, and a heater connected to the lead 64 in the core. 63 can be inserted. Separately from this, the core jig body 62a is formed with a hollow portion through which a cooling medium is passed in order to cool the entire core jig 62. For example, the core jig body 62a is cooled from the cooling medium introduction section 62b. The core jig main body 62a is cooled while drawing the medium and passing through the hollow portion, and the cooling medium is discharged from the cooling medium discharge portion 62c. The whole 62 is cooled so that a temperature difference from the outer mold 61 can be generated. At this time, while passing through the hollow portion of the core jig main body 62a, the cooling medium once goes out of the core jig main body 62a by the cooling medium transfer means 62c, and again the core jig main body. It may be drawn into another hollow part of 62a and guided to the cooling medium discharge part 62c. In this case, the cooling medium transfer means 62c may cool the heated cooling medium again to improve the cooling efficiency. In this way, the temperature of the core can be made lower than that of the outer mold 61 efficiently.

  The mold 6 in the present invention is heated and controlled by a heater or the like in order to obtain a pultruded product by curing the resin. Here, the temperature of the mold is preferably 70 to 170 ° C. If the mold temperature is less than 70 ° C., the fiber reinforced resin composition is easily pulled out in an uncured state, and if it exceeds 170 ° C., the curing reaction occurs rapidly, so cracks and warpage of the molded product are poor. This will increase the possibility of causing

  Here, the drawing speed is preferably in the range of 10 to 120 cm / min. When the drawing speed is less than 10 cm / min, the curing in the molding die is completed at an early stage, and the resistance during drawing is reduced. However, when the drawing speed exceeds 120 cm / min, the fiber-reinforced resin composition is easily drawn in an uncured state. Therefore, it is preferable that the drawing time (time for passing through the mold) is in the range of 0.5 to 3.0 minutes.

  In the pultrusion molding of the present invention, the fiber reinforced resin composition is continuously drawn into a heated mold, and the resin is subjected to a predetermined temperature while passing through the mold to be cured, and at the same time from the mold outlet. It will be pulled out in the time. The apparatus used in this pultrusion method is not particularly limited as long as it is a commonly used pultrusion apparatus.

  Further, by arranging the pitch-based carbon fiber filaments uniformly on the outer periphery of the conveying shaft, it is possible to obtain a conveying shaft with less warping and twisting. In order to uniformly arrange the carbon fibers on the outer periphery of the conveying shaft, it is effective to install an allocating jig having holes for allocating radially before the heating mold. If the guide hole is inclined along the fiber direction, it is effective for preventing the fiber from tearing.

  Furthermore, another effect of the allocating jig is that it is possible to remove excess resin impregnated in the carbon fiber, thereby preventing the meandering of the carbon fiber at the heating mold inlet and twisting. A conveying shaft with less can be obtained.

  Hereinafter, the present invention will be specifically described by way of examples. Here, in the following examples and comparative examples, the pultrusion molding is performed using the pultrusion product manufacturing apparatus of FIG.

Example 1
As a thermosetting resin component, 22 parts by mass of vinyl ester resin (Dainippon Ink Industries, trade name: UE3505), styrene monomer (trade name: Styrene monomer, made by Nippon Upica Co., Ltd.) 0.35 parts by mass, polyethylene (Product name: Flowsen UF-1.5, manufactured by Sumitomo Seika Co., Ltd.) 0.25 parts by mass, barium sulfate (manufactured by Sakai Chemical Industry Co., Ltd., product name: precipitated barium sulfate-100), 3.7 parts by mass, Organic peroxide 1 (Nippon Yushi Co., Ltd., trade name: Perbutyl O) 0.06 parts by mass, Organic peroxide 2 (Nippon Yushi Co., Ltd., trade name: Perhexa HC) 0.35 parts by mass, release agent (Product name: INT-1850HT [Organic acid, glyceride, synthetic resin condensate] manufactured by Kozakura Shokai Co., Ltd.) 0.35 parts by mass was placed in a kneader (disper) and kneaded for about 20 minutes. A thermosetting resin molding material was obtained.

  96 carbon fiber bundles HTA-W24K (manufactured by Toho Tenax Co., Ltd., trade name: 24,000 filaments converged) are prepared as a fiber base material, and this is a resin tank containing the thermosetting resin molding material obtained above. Was impregnated.

  The carbon fibers impregnated with this resin molding material are arranged on a circumference 50 mm away from the center, and four allocation jigs each having 16 guide holes with a hole diameter of 5 mm are arranged at equal intervals of 100 mm. In the same manner as shown in Fig. 6, six carbon fiber bundles impregnated with a resin molding material are sequentially passed so that the carbon fiber bundles rotate 90 ° clockwise while forming a spiral traveling path, Pulled into the mold, continuously heated to 160 ° C., sent to a mold with a core (length: 800 mm, inner diameter 20 mm), fully cured, pulled out at a rate of 20 cm / min, and cylindrical with a diameter of 20 mm A hollow pultruded product was continuously obtained and cut into a length of 1600 mm with a cutting device to obtain a pultruded product having a carbon fiber mass ratio of 70%. A core jig (length: 500 mm, outer shape: 15 mm, set temperature: 140 ° C.) was placed so as to contact the carbon fiber from 10 cm before the mold.

  The resulting pultruded product was placed on a V block (span 1500 mm), a dial gauge was applied to the center, and the run-out when the product was rotated was measured. The results are shown in Table 1.

(Comparative Example 1)
One allocation jig having a hole diameter of 5 mm and a total of 25 guide holes of 5 in the vertical direction and 5 in the horizontal direction is prepared, and this allocation jig is used as the allocation jig 5 (5a to 5d) of the first embodiment. A pultruded product was manufactured in the same manner as in Example 1, except that the carbon fiber bundles were passed through the guide holes by four.

この結果から、本発明の搬送用シャフトの製造方法は、シャフトの振れの低減に効果的であることがわかった。

From this result, it has been found that the method for manufacturing a conveying shaft according to the present invention is effective in reducing shaft deflection.

  DESCRIPTION OF SYMBOLS 1 ... Manufacturing apparatus of a pultruded product, 2 ... Bobbin, 3 ... Guide roll, 4 ... Resin bath, 5 (5a-5d) ... Allocation jig, 6 ... Mold, 7 ... Belt conveyor

Claims (6)

After impregnating the thermosetting resin composition into a plurality of fiber bundles, the fiber bundles are respectively guided through the guide holes of an allocating jig having a plurality of guide holes to guide the mold, A method of manufacturing a pultruded product that is cured while passing through a mold,
A plurality of the assignment jigs are arranged at predetermined intervals along the path of the fiber bundle, and the fiber bundles are arranged in a predetermined manner so as to be pressed against the side surfaces of the guide holes of the assignment jigs. A method for producing a pultruded product, wherein the yarn is threaded at an angle. After impregnating a thermosetting resin composition into a plurality of fiber bundles, the fiber bundles are inserted into the guide holes of the allocating jig having a plurality of guide holes formed at substantially equal intervals on the circumference. Each is a method for producing a pultruded product that is guided through a mold and cured while passing through the mold,
A plurality of the allocation jigs are arranged at a predetermined interval along the path of the fiber bundle, and each fiber bundle is transferred from the guide hole of one allocation jig to the guide hole of the next allocation jig. A method for producing a pultruded product, characterized in that, when threading, the fiber bundle passages are threaded through guide holes that are shifted in the same rotational direction so that the paths of the fiber bundles are spiral.   Each of the allocating jigs is arranged at equal intervals, and when passing each fiber bundle from the guide hole of one allocating jig to the guide hole of the next allocating jig, the same angle in the same rotation direction 3. The method of manufacturing a pultruded product according to claim 2, wherein the thread is passed through the shifted guide hole.   The mold includes an outer mold that forms an outer shape of a molded product, and a core jig having a hollow portion that can pass a cooling medium, and the core jig is molded at a lower temperature than the outer mold. The method for producing a pultruded product according to any one of claims 1 to 3, wherein:   The thermosetting resin composition comprises (A) a vinyl ester resin, (B) a crosslinking agent, (C) a low shrinkage agent, (D) an inorganic filler, (E) a release agent, and (F The organic peroxide is an essential component, and the (C) low shrinkage agent is polyethylene having a glass transition point of 70 to 120 ° C. Manufacturing method of pultruded products.   The method for producing a pultruded product according to any one of claims 1 to 5, wherein the fiber bundle is a carbon fiber.

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