JP4038521B2 - Long fiber reinforced resin strand production equipment - Google Patents

Description

  The present invention relates to an apparatus for producing long fiber reinforced resin strands.

  Injection-molded products using pellets obtained by cutting long long fiber reinforced resin strands to about 3 to 15 mm, for example, are automobile interior members (console boxes, instrument panels, etc.), automobile exterior members (bumpers, fenders, etc.), electronic It is used for housings of equipment members (notebook computers, mobile phones, etc.).

  The present applicant has previously proposed an apparatus for producing long fiber reinforced resin strands as disclosed in JP-A-5-169445. This will be described with reference to FIG. FIG. 6 is a diagram illustrating the configuration of a conventional long fiber reinforced resin strand manufacturing apparatus.

This conventional apparatus for producing long fiber reinforced resin strands is intended to produce long fiber reinforced resin strands having high adhesion between reinforcing fibers and resin. The molten resin material 52 is continuously supplied from an extruder 56 into a cross head (impregnation head) 55. On the exit side of the cross head 55, a shaping die 59, a cooler 60, twisting rollers (also called cross roller capstans) 61a and 61b, and a drawing roller 62 are arranged in this order. Is provided with a spreader 58 for defibrating the reinforcing fiber bundle.

  The reinforcing fibers 51, 51... Are immersed in the molten resin material 52 in the crosshead 55 and impregnated with the resin, and then the cross-sectional shape is determined by the shaping die 59 and cooled and cured in the cooler 60. . The twisting rollers 61a and 61b are rubber rollers, and are configured to be driven in reverse rotation. The twist rollers 61a and 61b are inclined in the opposite direction in the horizontal plane, and the long fiber reinforced resin strands 53 are sandwiched at the intersections of the twist rollers 61a and 61b and pulled in the direction of the arrow. The long fiber reinforced resin strand 53 is rotated about the axis. As a result, twist is imparted between the cooler 60 and the most downstream spreader 58a in the cross head 55. And the long fiber reinforced resin strand 53 to which the twist is given is cut by a pelletizer 63 provided at a position away from the drawing roller 62.

  By the way, in producing the long fiber reinforced resin strand by continuously taking out the long fiber reinforced resin strand composed of the resin impregnated reinforcing fiber bundle to which the twist is applied from the impregnation head (cross head), the present inventor According to these experiments, in the case of a long fiber reinforced resin strand having an outer diameter of 2.4 mm, the long fiber reinforced resin strand was twisted when the take-up speed (production speed) of the long fiber reinforced resin strand exceeded 40 m / min. On the other hand, slipping of the long fiber reinforced resin strand occurred with respect to the twisting roller.

  Therefore, in order to sufficiently cool the long fiber reinforced resin strand that has been taken from the impregnation head and travels in the horizontal direction before reaching the twisting roller, a long fiber reinforced resin strand that travels in the horizontal direction by storing cooling water is provided. A cooling water tank that was cooled by passing through the cooling water was used. As a result, a long cooling water tank is required for sufficient cooling, and a twisting roller is provided on the downstream side of the long cooling water tank, so that twisting is applied upstream of the cooling water tank. Reinforcing fibers because the tension is weak and the twisting of the reinforcing fiber bundle is performed while the resin impregnation is performed while the reinforcing fiber bundle is twisted as the take-up speed of the long fiber reinforced resin strand increases. It has been found that the bundle may not be sufficiently impregnated with molten resin.

Japanese Patent Laid-Open No. 5-169445 (paragraph number [0010], FIG. 1)

  Accordingly, an object of the present invention is to continuously take up a long fiber reinforced resin strand composed of a fiber bundle for reinforcing resin impregnation strengthened with a twist from an impregnation head, and to produce a long fiber reinforced resin strand at a higher speed than before. An object of the present invention is to provide a long fiber reinforced resin strand production apparatus capable of producing a long fiber reinforced resin strand at a speed (production speed), for example, a take-up speed exceeding 40 m / min.

  In order to solve the above problems, the present invention takes the following technical means.

The invention of claim 1 includes an impregnation head into which the reinforcing fiber bundle is continuously introduced from the upstream side, and a twister provided on the downstream side of the impregnation head, and the reinforcing fiber bundle is provided by the impregnation head. And impregnating the resin bundle with the molten resin, applying a twist by the twister to the fiber bundle for reinforcing resin impregnation, and continuously forming a long fiber reinforced resin strand composed of the fiber bundle for reinforcing resin impregnation to which the twist is applied from the impregnation head. withdrawal, the apparatus for manufacturing a continuous fiber-reinforced resin strand, provided between the twister and the impregnation head, a cooling device for cooling the continuous fiber-reinforced resin strand which runs taken off from the impregnation head cooling water A take-off machine for taking up the long fiber reinforced resin strand downstream from the cooling device, wherein the cooling device stores cooling water and draws it from the impregnation head. A cooling water tank that allows the long fiber reinforced resin strands to pass therethrough, and a plurality of the water reinforced resin strands are provided in the cooling water tank at intervals along the running direction of the long fiber reinforced resin strands. And a water spray nozzle that sprays water toward the surface, wherein the twister is composed of at least a pair of metal twist rollers having irregularities formed on the roller surface. It is a manufacturing apparatus of a long fiber reinforced resin strand.

  According to a second aspect of the present invention, in the long fiber reinforced resin strand manufacturing apparatus according to the first aspect of the invention, the water jet nozzles are arranged oppositely or staggered so as to sandwich the long fiber reinforced resin strand traveling path. It is a feature.

  Invention of Claim 3 is the manufacturing apparatus of the long fiber reinforced resin strand of Claim 1 or 2, The said twist machine hold | maintains so that each rotational axis may be located on a parallel plane, and this It is constituted by a pair of twisting rollers arranged so as to sandwich the long fiber reinforced resin strand with the rotation axis crossed, and is also used as the take-up machine. .

  According to a fourth aspect of the present invention, in the long fiber reinforced resin strand manufacturing apparatus according to the first, second, or third aspect, the reinforcing fiber bundle guided to the impregnation head is further heated upstream of the impregnation head. An apparatus for producing a long fiber reinforced resin strand, comprising a preheating heating device.

  The apparatus for producing long fiber reinforced resin strands according to claim 1 is a cooling water tank in which a high temperature long fiber reinforced resin strand taken from the impregnation head travels in cooling water as a cooling device between the impregnation head and the twister. In addition, a plurality of water jet nozzles that are provided at intervals along the traveling direction of the long fiber reinforced resin strands and that spray water toward the long fiber reinforced resin strands in the cooling water are provided. Therefore, by stirring the cooling water in the cooling water tank by the water flow generated when these water injection nozzles inject water, continuous fiber reinforced resin strands traveling in the cooling water from the inlet side to the outlet side are continuously formed. Compared with a cooling water tank that does not have a water injection nozzle, a new cooling water flow is introduced and brought into contact with the cooling water tank to efficiently perform heat exchange between the long fiber reinforced resin strand and the cooling water, thereby cooling the long fiber reinforced resin strand. Speed can be increased. Thus, for example, when producing a long fiber reinforced resin strand at a high take-up speed exceeding 40 m / min, the length of the cooling water tank (long fiber) compared to the conventional take-up speed of 40 m / min or less. Even if the length of the reinforcing resin strand running direction) is not increased, the long fiber reinforced resin strand can be sufficiently cooled. Therefore, a long fiber reinforced resin strand in which a reinforcing fiber bundle is sufficiently impregnated with a resin material at a higher take-up speed than that of a conventional method, for example, a take-up speed exceeding 40 m / min. It can be manufactured without slipping.

  The apparatus for producing a long fiber reinforced resin strand according to claim 2 is such that a water injection nozzle for injecting water toward the long fiber reinforced resin strand traveling in the cooling water faces the long fiber reinforced resin strand traveling path. Arranged or staggered. Therefore, it is possible to prevent the long fiber reinforced resin strand from being displaced in one direction due to the water flow from the water jet nozzle, and it is possible to run the long fiber reinforced resin strand straight and smoothly.

  The apparatus for producing a long fiber reinforced resin strand according to claim 3 is a state in which the twisting machine holds the respective rotation axes so as to be located on parallel planes (horizontal planes) and crosses the rotation axes. It is composed of a pair of twist rollers arranged so as to sandwich the long fiber reinforced resin strands, and has a function of imparting twist to the resin impregnated reinforcing fiber bundle and a function of taking a continuous long fiber reinforced resin strand. Therefore, this twister can also be used as a take-up machine, and a separate take-up machine can be dispensed with. Therefore, the apparatus configuration can be simplified.

  The long fiber reinforced resin strand manufacturing apparatus according to claim 4 is further provided with a preheating heating device for heating the reinforcing fiber bundle prior to introduction into the impregnation head on the upstream side of the impregnation head. When normal-temperature reinforcing fiber bundles are supplied to the impregnation head at high speed, the degree of impregnation of the molten resin into the reinforcing fiber bundles is increased by increasing the viscosity of the molten resin by lowering the molten resin temperature in the impregnation head. As a result, the tension (retraction resistance) of the reinforcing fiber bundle traveling while being taken up in the impregnation head is increased. Therefore, by providing the heating device for preheating, the deterioration of the impregnation degree can be eliminated, and the increase in the tension can be greatly suppressed, and the take-up speed (production speed) of the long fiber reinforced resin strand can be reduced. The speed can be increased.

  In the apparatus for producing a long fiber reinforced resin strand according to claim 5, the twisting machine is constituted by at least a pair of twisting rollers made of metal having irregularities formed on the roller surface. Accordingly, since the coefficient of friction between the metal twisting roller and the long fiber reinforced resin strand is increased, the paired metal products are combined with the sufficient cooling effect of the long fiber reinforced resin strand by the cooling device. The twisting machine constituted by the twisting roller can twist the long fiber reinforced resin strand more reliably without causing slippage of the long fiber reinforced resin strand. Moreover, since it is a metal twisting roller, it is less likely to wear than a rubber twisting roller and has a long service life. Therefore, the long fiber reinforced resin strand can be taken up over a long period of time without causing slippage.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration explanatory view of an apparatus for producing a long fiber reinforced resin strand according to an embodiment of the present invention.

  As shown in FIG. 1, a reinforcing fiber bundle 2 made of reinforcing fibers 1 fed out from a plurality of bobbins 5 includes a pair of heating rollers 8A and 8B arranged up and down in order to perform preheat treatment. Then, it is guided to the preheating heating device 7. The reinforcing fiber bundle 2 is heated by heating the heating roller 8A, which is heated by being alternately wound around the pair of heating rollers 8A, 8B while being back tensioned by a plurality of guide bars 6. The temperature is raised by contact heating due to close contact with 8B.

  An extruder 9 containing a screw 10 is provided immediately downstream of the preheating heating device 7, and a molten resin (molten thermoplastic resin) 3 is continuously supplied from the extruder 9, and the preheating is performed. An impregnation head (molten resin bath container) 11 to which the heated reinforcing fiber bundle 2 from the heating device 7 is guided is provided. In the impregnation head 11, a plurality of impregnation rollers (defibration / impregnation rollers) 12 for impregnating the molten fiber 3 into the continuously supplied reinforcing fiber bundle 2 are disposed. At the outlet of the impregnation head 11, a shaping die 13 for shaping (molding) the high-temperature long fiber reinforced resin strand 4 made of a twisted resin-impregnated reinforcing fiber bundle taken from the impregnation head 11. It is attached.

  A cooling device 14 for cooling the high-temperature long fiber reinforced resin strand 4 from the impregnation head 11 in the cooling water is provided on the downstream side of the impregnation head 11 to which the shaping die 13 is attached. A twister 18 is provided immediately downstream of the cooling device 14. In addition, the long fiber reinforced resin strand 4 manufactured by the manufacturing apparatus of this embodiment and guided to the downstream side of the twister 18 is cut by a pelletizer (strand cutter) 30 on the downstream side of the twister 18 and pelletized. It has come to be.

  The preheating heating device 7 will be described. The preheating heating device 7 includes a pair of heating rollers 8A and 8B arranged one above the other, and the reinforcing fiber bundle 2 is placed on the outer peripheral surface of each heating roller 8A and 8B a plurality of times (for example, 10 turns). ) A groove for winding and guiding is provided in parallel. Each of the heating rollers 8A and 8B has a flat plate-like electric heater attached to the disk-shaped web, and slips from the outside of the roller to these electric heaters that rotate integrally with the heating rollers 8A and 8B. Electric power is supplied through the ring. The heating rollers 8A and 8B are each adjusted to have a predetermined set temperature by controlling the power supplied to the electric heater based on the temperature measurement result by the non-contact thermometer. ing. The set temperature of the heating rollers 8A and 8B is set in a range where the molten resin temperature in the impregnation head 11 is not excessively lowered by the high-speed take-up of the reinforcing fiber bundle 2.

  Next, the cooling device 14 will be described. 2 is a plan view schematically showing the configuration of the water cooling apparatus in FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA in FIG.

  The cooling device 14 has a box shape with a lid that can be opened on the upper side, stores cooling water, and passes through the cooling water through the long fiber reinforced resin strand 4 that is drawn from the impregnation head 11 and travels in the horizontal direction. 15 and a staggered arrangement in the cooling water tank 15 at a predetermined interval from the upstream side to the downstream side along the running direction of the long fiber reinforced resin strand 4 and sandwiching the running path of the long fiber reinforced resin strand 4 A plurality of water injection nozzles 16 for injecting water toward the long fiber reinforced resin strand 4 in the cooling water and a pressurized water supply pipe 17 for supplying pressurized water to these water injection nozzles 16 are provided. Instead of the staggered arrangement, the arrangement may be opposed.

  Further, the cooling water tank end plates 15a, 15a of the cooling water tank 15 are provided with U-shaped notch openings (not shown) so that the resin-impregnated reinforcing fiber bundle can pass therethrough. The cooling water in the cooling water tank 15 spills from the U-shaped notch opening of the cooling water tank end plates 15a, 15a, but the cooling water is supplied into the cooling water tank 15 through the water jet nozzle 16 from the pressurized water supply pipe 17 and the water level. Is kept constant. In addition, you may make it keep a water level constant by supplying cooling water from the supply port which supplies cooling water in the cooling water tank provided separately besides the water injection nozzle. Under the cooling water tank end plates 15a, 15a, a pump, a drain container and a drain pipe (not shown) for returning and circulating the cooling water from the cooling water tank 15 are provided.

  Next, the twister 18 will be described. FIG. 4 is an explanatory view of the twisting machine 18 in FIG.

The twisting machine 18 holds the respective rotation axes on parallel planes (horizontal planes), and is disposed so as to sandwich the long fiber reinforced resin strands 4 from the cooling device 14 in a state where the rotation axes are crossed. The pair of twisting rollers 19A and 19B. That is, the rotation axis of the upper twisting roller 19A and the rotation axis of the lower twisting roller 19B in FIG. 4 are not in a direction orthogonal to the take-up direction (traveling direction) of the long fiber reinforced resin strand 4, but are taken in a plan view. The directions are set in directions opposite to each other and at a predetermined angle with the same angle. In addition, the metal twist rollers 19A and 19B are respectively provided with irregularities 19Aa and 19Ba by knurling over the entire roller surface (roller outer peripheral surface).

  In this embodiment, the pair of twisting rollers 19A and 19B are both configured to be rotationally driven. The twisting machine 18 provided with the pair of twisting rollers 19A and 19B has a function of twisting the resin-impregnated reinforcing fiber bundle and a function of taking the long fiber-reinforced resin strand 4 from the cooling device 14. Therefore, it is not necessary to separately provide a take-up machine on the downstream side of the twisting machine 18. In addition, when the installation distance from the twister 18 to the strand cutter becomes long, or when it is desired to take up a fragile strand at a high speed, the same configuration as the twister 18 as a take-up device downstream of the twister 18 You may provide a pair of take-up roller which has these.

  Next, the production of the long fiber reinforced resin strand by the long fiber reinforced resin strand production apparatus configured as described above will be described. The reinforcing fiber bundle 2 made of reinforcing fibers fed out from the plurality of bobbins 5 is guided to a pair of heating rollers 8A and 8B arranged above and below, and applied to the heating rollers 8A and 8B while applying back tension. It is led into the impregnation head 11 while being heated by contact heating by being alternately wound a plurality of times. The reinforcing fiber bundle 2 is subjected to resin impregnation in the process of passing through each impregnation roller 12 in the impregnation head 11 filled with the high-temperature molten resin 3 supplied from the extruder 9, and the resin impregnation reinforcing fiber Made with a bunch. In addition, the resin-impregnated reinforcing fiber bundle is twisted by a twisting operation by the twisting machine 18 so that the twist is generated and grown from the downstream impregnation roller 12 in the impregnation head 11. In this way, the impregnating head 11 impregnates the reinforcing fiber bundle 2 with the molten resin 3 supplied from the extruder 9 and imparts twist to the resin impregnated reinforcing fiber bundle by the twisting operation by the twisting machine 18. The long fiber reinforced resin strands 4 made of the resin-impregnated reinforcing fiber bundle to which the twist is applied from 11 are continuously taken up.

  Then, the high-temperature long fiber reinforced resin strand 4 continuously taken from the impregnation head 11 through the shaping die 13 is guided to the cooling device 14 and travels in the cooling water in the cooling water tank 15, and its travel path. Is cooled and hardened by receiving a water flow from the water jet nozzles 16 arranged in a staggered manner so as to sandwich them, and led to the twisting rollers 19A and 19B. The twisting operation and the take-up are performed by the twisting rollers 19A and 19B on the long fiber reinforced resin strand 4 that has been cooled from the cooling device 14. Then, the long fiber reinforced resin strand 4 guided to the downstream side of the twister 18 is cut and pelletized by a pelletizer 30 on the downstream side of the twister 18 (see FIG. 5).

  As described above, the apparatus for producing a long fiber reinforced resin strand according to the present embodiment includes the high temperature long fiber reinforced resin strand 4 taken out from the impregnation head 11 as the cooling device 14 between the impregnation head 11 and the twister 18. In the cooling water tank 15 that travels in the cooling water in the horizontal direction, a plurality of the long fiber reinforced resin strands 4 are provided at intervals along the traveling direction of the long fiber reinforced resin strands 4 and water is sprayed toward the long fiber reinforced resin strands 4 in the cooling water. A water injection nozzle 16 is provided.

  Therefore, by stirring the cooling water in the cooling water tank by the water flow generated by the water jet nozzle 16 jetting water, the long fiber reinforced resin strand 4 traveling in the cooling water from the inlet side to the outlet side, By continuously introducing and bringing into contact with a new cooling water flow, heat exchange between the long fiber reinforced resin strand 4 and the cooling water can be performed more efficiently than a conventional cooling water tank that does not have the water jet nozzle 16. The cooling rate for the fiber reinforced resin strand 4 can be increased. Thus, for example, when producing a long fiber reinforced resin strand at a high take-up speed exceeding 40 m / min, the length of the cooling water tank (long fiber) compared to the conventional take-up speed of 40 m / min or less. Even if the length of the reinforcing resin strand running direction) is not increased, the long fiber reinforced resin strand 4 can be sufficiently cooled. Therefore, the long fiber reinforced resin strand 4 in which the reinforcing fiber bundle is sufficiently impregnated with the resin material at a higher take-up speed than the conventional one, for example, a take-up speed exceeding 40 m / min. 4 can be produced without slipping.

  The water injection nozzles 16 are staggered so as to sandwich the long fiber reinforced resin strand traveling path. Therefore, it is possible to prevent the long fiber reinforced resin strand 4 from being displaced in one direction due to the water flow from the water jet nozzle 16 and to run the long fiber reinforced resin strand 4 straight and smoothly. Instead of the staggered arrangement, the counter arrangement may be used.

  Moreover, the manufacturing apparatus of the long fiber reinforced resin strand according to the present embodiment has a pair in which the twister 18 has a function of twisting the resin impregnated reinforcing fiber bundle and a function of taking up the continuous long fiber reinforced resin strand 4. The twisting rollers 19A and 19B are provided, and a separate take-up machine is not required. Therefore, the apparatus configuration can be simplified.

  The long fiber reinforced resin strand manufacturing apparatus according to the present embodiment is further provided with a preheating heating device 7 for heating the reinforcing fiber bundle 2 prior to introduction into the impregnation head 11 on the upstream side of the impregnation head 11. It has been. When normal-temperature reinforcing fiber bundles are supplied to the impregnation head at high speed, the degree of impregnation of the molten resin into the reinforcing fiber bundles is increased by increasing the viscosity of the molten resin by lowering the temperature of the molten resin in the impregnation head. As a result, the tension (retraction resistance) of the reinforcing fiber bundle that travels while being taken up in the impregnation head increases. Therefore, by providing the preheating heating device 7, the deterioration of the impregnation degree can be eliminated, and the increase in the tension can be greatly suppressed, and the take-up speed (production speed) of the long fiber reinforced resin strand 4 can be reduced. The speed can be further increased.

  Further, in the long fiber reinforced resin strand manufacturing apparatus according to the present embodiment, the twisting machine 18 is composed of a pair of metal twisting rollers 19A and 19B in which irregularities 19Aa and 19Ba are formed on the roller surface. Therefore, since the friction coefficient between the metal twist rollers 19A and 19B and the long fiber reinforced resin strand 4 is increased, combined with the sufficient cooling effect of the long fiber reinforced resin strand 4 by the cooling device 14, more The long fiber reinforced resin strand 4 can be twisted without causing the long fiber reinforced resin strand 4 to slip. Further, since it is a metal twisting roller, it is less likely to wear than a rubber twisting roller and has a long life, so that the long fiber reinforced resin strand 4 can be taken up over a long period of time without causing slippage. .

  Using the apparatus shown in FIGS. 1 to 4, a production test of long fiber reinforced resin strands was performed. Glass fiber was used as the reinforcing fiber, and polypropylene was used as the thermoplastic resin.

  The cooling device 14 in Examples 1 to 4 will be described. The length of the cooling water tank 15 is 2 m. As for the water injection nozzles 16, 20 in the row on one side (the lower side in FIG. 2) sandwiching the long fiber reinforced resin strand running path and 20 in the row on the other side (the upper side in FIG. 2) A staggered arrangement was made. The distance between the center lines of adjacent water spray nozzles 16 in the strand travel direction is 70 mm. In addition, the length of the cooling water tank 15 in Comparative Example 1 and Comparative Example 2 is also 2 m (Comparative Examples 1 and 2: No water injection nozzle 16).

  In the preheating heating device 7 in Examples 1 to 4 and Comparative Examples 1 and 2, the heating rollers 8A and 8B were heated to a roller temperature of 300 ° C. At this time, the temperature of the reinforcing fiber bundle 2 introduced into the impregnation head 11 was about 250 ° C.

  The twisting rollers (cross rolls) 19A and 19B of the twisting machine 18 in Examples 1 to 4 and Comparative Examples 1 and 2 will be described. The twisting rollers 19A and 19B are both rotationally driven mechanisms, are made of an SKD11 (alloy tool steel) tempered material, and have an unevenness of 1 mm iris pitch on the entire roller surface by knurling.

  From the preliminary test, it is known that if the temperature of the long fiber reinforced resin strand immediately after passing through the cooling water tank is 75 ° C. or less, the long fiber reinforced resin strand can be taken out without slipping in the twisting roller. Therefore, Table 1 shows the results of examining the take-up speed when the temperature of the long fiber reinforced resin strand immediately after passing through the cooling water tank is 75 ° C. or less in a cooling water tank having a length of 2 m.

  In Example 1, under the limitation of a cooling path as short as 2 m, a long fiber reinforced resin strand having an outer diameter of 4 mm and being difficult to cool could be taken up at a speed exceeding 50 m / min.

  In Example 2, a slightly thin long fiber reinforced resin strand having an outer diameter of 2.4 mm is 90 m / min under the limitation of a short cooling path of 2 m (although the take-up speed was not increased any more) compared with the conventional one. I was able to pick it up so fast that I couldn't.

  In Example 3, the 4 mm long fiber reinforced resin strand having the same diameter as that in Example 1 was taken up, and the temperature of the molten resin in the impregnation head was set higher than that in Example 1 to make it difficult to cool. Even when the outer diameter is large and the temperature is much higher than usual, the long fiber reinforced resin strand is drawn at a speed exceeding 40 m / min, which is faster than the conventional take-up speed (see Comparative Example 1), with a cooling path as short as 2 m. I was able to.

  In Example 4, when a 2.4 mm long fiber reinforced resin strand having the same diameter as in Example 2 was taken, the molten resin temperature in the impregnation head was made higher than that in Example 2 to make it difficult to cool. Even when the temperature is very high compared to normal, the cooling path is as short as 2 m, and the speed is 90 m / min (more than that, the take-up speed has not been increased). The long fiber reinforced resin strand could be taken up.

  On the other hand, Comparative Example 1 was operated by using a 4 mm long fiber reinforced resin strand having the same diameter as that of Example 3 under the same preheating conditions as Example 3, and water was not jetted into the cooling water tank by the water jet nozzle. Is different. In Comparative Example 1, slip occurred when the speed exceeded 26 m / min, which is a lower speed than Example 3 (take-off speed: 44 m / min).

  In Comparative Example 2, a 2.4 mm long fiber reinforced resin strand having the same diameter as in Example 4 was operated under the same preheating conditions as in Example 4, and water was not jetted into the cooling water tank by the water jet nozzle. It is different in point. In Comparative Example 2, slip occurred at a speed exceeding 40 m / min, which is a lower speed than Example 4 (take-off speed: 90 m / min or more).

  In the embodiment of the present invention, the reinforcing fiber bundle is heated by the preheating heating device 7. However, the long fiber reinforced resin strand manufacturing apparatus according to the present invention is not included in the impregnation head without using the preheating heating device. It is effective even when the molten resin viscosity is appropriately maintained.

It is composition explanatory drawing of the manufacturing apparatus of the long fiber reinforced resin strand by one Embodiment of this invention. It is a top view which shows schematically the structure of the water cooling apparatus in FIG. It is AA sectional drawing of FIG. It is explanatory drawing of the twister in FIG. It is a schematic diagram of the pellet which cut | disconnected the twisted long fiber reinforced resin strand. It is composition explanatory drawing of the manufacturing apparatus of the conventional long fiber reinforced resin strand.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Reinforcing fiber 2 ... Reinforcing fiber bundle 3 ... Molten resin 4 ... Long fiber reinforced resin strand 5 ... Bobbin 6 ... Guide bar 7 ... Preheating heating device 8A, 8B ... Heating roller 9 ... Extruder 10 ... Screw 11 DESCRIPTION OF SYMBOLS ... Impregnation head 12 ... Impregnation roller 13 ... Shaping die 14 ... Cooling device 15 ... Cooling water tank 15a ... Cooling water tank end plate 16 ... Water injection nozzle 17 ... Pressurized water supply pipe 18 ... Twisting machine 19A, 19B ... Twisting roller 19Aa, 19Ba ... Unevenness 30 ... Pelletizer (Strand Cutter)

Claims (4)

An impregnation head in which the reinforcing fiber bundle is continuously introduced from the upstream side, and a twister provided on the downstream side of the impregnation head, and the reinforcing fiber bundle is impregnated with the molten resin by the impregnation head. The fiber-reinforced resin strand is provided with a twist by the twister, and the long-fiber-reinforced resin strands made of the resin-impregnated reinforcing fiber bundle to which the twist is applied from the impregnation head are continuously taken up. In an apparatus for manufacturing
A cooling device that is provided between the impregnation head and the twister and that cools the long fiber reinforced resin strand that is taken from the impregnation head and travels in cooling water , and a long fiber reinforced resin downstream of the cooling device. A take-up machine for taking up the strand, wherein the cooling device stores the cooling water, passes the long-fiber reinforced resin strand that is taken from the impregnation head and travels, and the long-fiber reinforced resin in the cooling water tank. A plurality of water jet nozzles that are provided at intervals along the strand running direction and that spray water toward the long fiber reinforced resin strands in the cooling water ; An apparatus for producing long fiber reinforced resin strands, comprising at least a pair of twist rollers made of metal having irregularities formed on the surface .   2. The apparatus for producing long fiber reinforced resin strands according to claim 1, wherein the water injection nozzles are arranged oppositely or staggered so as to sandwich the long fiber reinforced resin strand traveling path.   A pair of twists arranged so as to face each other so that the twisting machine holds the respective rotation axes so as to be positioned on parallel planes, and sandwich the long fiber reinforced resin strand in a state where the rotation axes are crossed. The long-fiber reinforced resin strand manufacturing apparatus according to claim 1 or 2, wherein the long-fiber reinforced resin strand is constituted by a roller and also used as the take-up machine.   The long fiber reinforced resin strand manufacturing apparatus according to claim 1, 2, or 3, further comprising a preheating heating device for heating the reinforcing fiber bundle guided to the impregnation head upstream of the impregnation head. An apparatus for producing a long fiber reinforced resin strand, wherein

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