JP7125604B2 - Reinforced resin molding manufacturing apparatus and manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a production apparatus and a production method for a reinforced resin molding.

Reinforced resin molded articles whose material properties are improved by reinforcing materials such as glass fiber and carbon fiber are manufactured by injection molding or extrusion molding of thermoplastic resin pellets (reinforced resin pellets) containing reinforcing materials inside. is common. However, since the material cost of reinforced resin pellets is high, in recent years, in order to reduce the material cost, a technique has been developed in which the resin pellets and the reinforcing material are separately supplied to the molding machine to mold the reinforced resin molded body. there is This technique is also called direct blend molding.

Patent Literature 1 discloses an injection molding apparatus for injection molding a fiber reinforced resin by direct blend molding. The injection molding apparatus disclosed in Patent Document 1 includes a cylinder, a screw rotatably provided inside the cylinder, a resin material supply hopper, and a reinforcing material supply hopper. The resin material supply hopper is connected to a resin material supply opening provided on the side surface of the cylinder. The reinforcing material supply hopper is connected to a reinforcing material supplying opening provided at a position forward of the resin material supplying opening in the side surface of the cylinder. According to the injection molding apparatus disclosed in Patent Document 1, resin is supplied from the resin material supply hopper through the resin material supply opening into the cylinder, and reinforcing fibers are supplied into the cylinder from the reinforcement material supply hopper through the reinforcement material supply opening. be. The resin supplied into the cylinder is heated and melted within the cylinder. Further, the reinforcing fiber supplied into the cylinder through the reinforcing material supply opening joins the molten resin flowing to the supply position, and then dispersed in the molten resin by the rotation of the screw. A fiber-reinforced resin molding is manufactured by injecting molten resin in which reinforcing fibers are dispersed.

WO2014/170932

(Problems to be solved by the invention)
According to the manufacturing method described in Patent Document 1, the reinforcing material joins the molten resin flowing in the cylinder. must be secured to Therefore, when trying to manufacture a reinforced resin molded body with a particularly high reinforcing material content, the amount of resin is limited as the space for supplying the reinforcing material into the cylinder increases. As a result, the plasticizing ability (transporting ability) of the resin is lowered. In addition, since the reinforcing material is forcibly pushed into the molten resin in the cylinder, the reinforcing material mixed with the molten resin is subjected to high resin pressure. Then, the reinforcing material is broken due to the shearing force caused by the rotation of the screw while receiving the high resin pressure. Furthermore, since the molten resin is present in the area where the reinforcing material is supplied into the cylinder, the molten resin narrows the clearance between the flight of the screw and the inner wall of the cylinder in the area where the reinforcing material is supplied. Therefore, there is a high possibility that the reinforcing material will be sandwiched in the narrowed clearance, and the reinforcing material thus sandwiched in the clearance will be broken due to the shear force caused by the rotation of the screw. As described above, according to Patent Document 1, there is a high possibility that the reinforcing material is broken in the cylinder, and as a result, the size of the reinforcing material in the reinforced resin molding, for example, the fiber length of the reinforcing fiber is shortened.

FIG. 15 is a graph showing the relationship between the fiber length of the glass fiber as a reinforcing material contained in the glass fiber reinforced resin molded article and the material properties (rigidity, strength, impact resistance) of the glass fiber reinforced resin molded article. (Source: Automotive technology, [3](2010)). In FIG. 15, the horizontal axis represents the fiber length of the glass fiber, and the vertical axis represents the magnitude of the material properties of the glass fiber reinforced resin molding. As shown in FIG. 15, the longer the fiber length of the glass fiber, the more improved the material properties such as modulus, strength, and impact resistance of the glass fiber reinforced resin molding. .

Therefore, in order to improve the material properties of the reinforced resin molded body, it is preferable that the reinforcing material is large (or long). The material properties of the molded body cannot be sufficiently improved.

The present invention provides a manufacturing apparatus and manufacturing method for a reinforced resin molding that can suppress breakage of the reinforcing material during molding and can manufacture a reinforced resin molding with a high reinforcing material content. With the goal.

(means to solve the problem)
The present invention is formed in a cylindrical shape having a front end (31) and a rear end (32), and has a reinforcing material supply opening (34) on its side peripheral surface and a melting point located closer to the front end than the reinforcing material supply opening. A cylinder (3) in which a resin supply opening (35) is formed, and a reinforcing material supplying device connected to the reinforcing material supplying opening and capable of supplying the reinforcing material to the inside of the cylinder through the reinforcing material supplying opening. (7), a molten resin supply device (6) connected to the molten resin supply opening and configured to supply the molten resin to the inside of the cylinder through the molten resin supply opening, and the cylinder inside the cylinder. a screw (4) which is arranged along the axial direction and is configured to be able to feed the material supplied into the cylinder from the rear end side to the front end side of the cylinder by being rotationally driven; Provided is an apparatus (1) for manufacturing a reinforced resin molded body.

According to the present invention, the reinforcing material is supplied to the inside of the cylinder through the reinforcing material supply opening, and the molten resin is supplied to the inside of the cylinder through the molten resin supply opening. Further, the molten resin supply port is located closer to the front end of the cylinder than the reinforcing material supply opening. Therefore, the molten resin supplied into the cylinder through the molten resin supply opening joins the reinforcing material already supplied into the cylinder and sent to the front end side by the rotation of the screw. That is, conventionally, the reinforcing material joins the molten resin flowing inside the cylinder, whereas in the present invention, the molten resin joins the reinforcing material flowing inside the cylinder. Since the bulk density of the reinforcing material flowing in the cylinder is smaller than that of the molten resin, even if the amount of the reinforcing material is large, a sufficient amount of the molten resin can be mixed therein. Therefore, it is possible to produce a reinforced resin molded article having a high reinforcing material content. In addition, since there is no molten resin in the reinforcing material supply area into the cylinder, that is, in the area near the reinforcing material supply opening, the clearance between the flight of the screw and the inner wall of the cylinder in the reinforcing material supply area is caused by the molten resin. not be narrowed. Therefore, it is possible to reduce the possibility of breakage of the reinforcement due to the reinforcement being sandwiched between the clearances in the supply region of the reinforcement, and as a result, the reinforcement can be made small (or shortened). can be effectively prevented. Thus, by using the apparatus for manufacturing a reinforced resin molded body according to the present invention, it is possible to suppress breakage of the reinforcing material and manufacture a reinforced resin molded body having a high content of the reinforcing material.

The compression ratio of the screw provided in the cylinder is preferably 2.0 or less. By using a screw with a compression ratio of 2.0 or less, it is possible to reduce the resin pressure of the molten resin supplied into the cylinder. Therefore, it is possible to reduce the possibility that the reinforcing material in the molten resin is broken due to the resin pressure of the molten resin supplied into the cylinder. In this case, the screw provided in the cylinder is preferably a non-compression screw. Since the resin pressure of the molten resin can be further reduced by using the non-compression screw, it is possible to further reduce the possibility of breakage of the reinforcing material in the molten resin due to the resin pressure.

In addition, among the flights (44) of the screw provided in the cylinder, the flight (44A) facing the reinforcing material supply opening formed in the cylinder is formed with a first slit (441) opening to the outer periphery. good. According to this, the reinforcement sandwiched in the clearance between the flight facing the reinforcement supply opening and the inner wall of the cylinder after being supplied into the cylinder through the reinforcement supply opening falls into the first slit, Reinforcement pinching in the clearance is eliminated. Therefore, it is possible to further reduce the frequency of breakage of the reinforcing material due to being sandwiched by the clearance, and as a result, it is possible to further improve the mechanical strength of the reinforced resin molded article.

The width of the first slit should be large enough to allow the reinforcing material to pass through. For example, when the reinforcing material is reinforcing fibers, the width of the first slit is preferably equal to or greater than the width of the reinforcing fibers. For example, when the width of the reinforcing fiber is 0.5 mm, the width of the first slit is preferably 0.5 mm or more.

Further, of the flights of the screw provided in the cylinder, it is preferable that the flight (44C) facing the molten resin supply opening formed in the cylinder is formed with a second slit (442) open to the outer periphery. According to this, the molten resin supplied into the cylinder from the molten resin supply opening passes through the second slit, so that the transportation of the molten resin to the front end side of the cylinder can be promoted, and the molten resin can be smoothly transported. can reduce the resin pressure. As a result, it is possible to further prevent the reinforcing material in the molten resin from being broken by the resin pressure.

Further, the apparatus for manufacturing a reinforced resin molded product according to the present invention controls the molten resin so that the resin pressure of the molten resin supplied into the cylinder through the molten resin supply opening matches a preset resin pressure as a low pressure. It is preferable to provide a control device (8) for controlling the amount of molten resin supplied from the supply device into the cylinder. In this case, the controller preferably controls the amount of molten resin so that the resin pressure becomes zero. According to this, by reducing the resin pressure of the molten resin in the cylinder, preferably by setting the resin pressure to 0, it is possible to effectively prevent the reinforcing material in the cylinder from flowing back due to the resin pressure. In addition, it is possible to further prevent the reinforcing material in the molten resin from being broken due to the resin pressure.

Further, the present invention includes a reinforcing material supply step of supplying a reinforcing material into a cylindrically formed cylinder having a front end portion and a rear end portion, and rotating a screw provided in the cylinder to drive the reinforcing material into the cylinder. A reinforcing material transporting step of transporting the supplied reinforcing material to the front end side, a joining step of supplying the molten resin into the cylinder to merge the molten resin with the reinforcing material flowing in the cylinder, and a joining step of joining the molten resin. The control process controls the amount of molten resin supplied into the cylinder so that the resin pressure of the melted resin matches the set resin pressure preset as a low pressure, and the merging process is performed by rotating the screw. A method for producing a reinforced resin molding, comprising a dispersing step of further transporting the melted resin and reinforcing material to the front end side and dispersing the reinforcing material in the molten resin.

According to the manufacturing method according to the present invention, since the molten resin joins the reinforcing material flowing in the cylinder, as described above, it is possible to suppress breakage of the reinforcing material and to strengthen the reinforcing material with a high content rate of the reinforcing material. A resin molding can be produced.

FIG. 1 is a schematic diagram showing the configuration of a manufacturing apparatus for a reinforced resin molded body according to this embodiment. FIG. 2 is a schematic partial cross-sectional view of the main transport device and the molten resin supply device cut horizontally and viewed from above. 3 is a schematic partial cross-sectional view of the main transport device taken along line III--III of FIG. 2; FIG. FIG. 4 is a schematic partial cross-sectional view of the molten resin supply device taken along line IV--IV in FIG. FIG. 5 is a side view of the sub-screw. FIG. 6 is an enlarged view of part C in FIG. FIG. 7 is an enlarged view of part D in FIG. FIG. 8 is a diagram showing various configuration examples of the first slit or the second slit. FIG. 9 is a diagram showing how materials flow in the main cylinder of the main transport device and the sub-cylinder of the molten resin supply device shown in FIG. FIG. 10 is a diagram showing a manufacturing process of a sample of the reinforced resin molding according to Example 1. FIG. FIG. 11 is a diagram showing a manufacturing process of a sample of the reinforced resin molding according to Example 2. FIG. 12A and 12B are diagrams showing a manufacturing process of a sample of the reinforced resin molding according to Example 3. FIG. FIG. 13 is a diagram showing a manufacturing process of a sample of a reinforced resin molding according to a comparative example. FIG. 14 is a side view of a variable pitch screw applicable as the screw according to the present invention. FIG. 15 is a graph showing the relationship between the fiber length of the glass fiber as a reinforcing material contained in the glass fiber reinforced resin molded article and the material properties (rigidity, strength, impact resistance) of the glass fiber reinforced resin molded article. .

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of a manufacturing apparatus for a reinforced resin molded product (hereinafter simply referred to as a manufacturing apparatus) according to this embodiment. As shown in FIG. 1 , the manufacturing apparatus 1 according to this embodiment includes a main transport device 2 , a molten resin supply device 6 , a reinforcing material supply device 7 and a control device 8 . The main transport device 2 has a function of transporting the reinforcing material and the molten resin containing the reinforcing material. The molten resin supply device 6 has a function of supplying molten resin to the main transport device 2 . The reinforcing material supplying device 7 has a function of supplying reinforcing material to the main transportation device 2 . A control device 8 controls the main transport device 2 , the molten resin supply device 6 and the reinforcing material supply device 7 .

FIG. 2 is a schematic partial cross-sectional view of the main transport device 2 and the molten resin supply device 6 cut horizontally and viewed from above. As shown in FIGS. 1 and 2 , the main transport device 2 comprises a main cylinder 3 , a main screw 4 and a drive device 5 . The main cylinder 3 corresponds to the cylinder of the present invention, and the main screw 4 corresponds to the screw of the present invention.

The main cylinder 3 is a tubular member having a front end portion 31 (left end portion in FIG. 2) and a rear end portion 32 (right end portion in FIG. 2) which are respectively open, and a columnar internal space is formed therein. be.

A plurality of main band heaters 91 are attached to the outer circumference of the main cylinder 3 . The main cylinder 3 is heated by operating the main band heater 91 . By heating the main cylinder 3, the material in the main cylinder 3 is heated. A temperature sensor is installed at an appropriate location on the main cylinder 3, and temperature information detected by this temperature sensor is input to a heater control device (not shown). The heater control device controls the operation of the main band heater 91 so that the detected temperature matches the set temperature. By individually controlling the plurality of main band heaters 91 , it is possible to set a plurality of different set temperatures along the axial direction of the main cylinder 3 .

A main screw 4 is arranged inside the main cylinder 3 along the axial direction of the main cylinder 3 . The main screw 4 has a leading end 41 and a trailing end 42 and is formed in a long bar shape. The main screw 4 is positioned in the cylindrical internal space inside the main cylinder 3 so that the tip 41 side is positioned on the front end portion 31 side of the main cylinder 3 and the rear end 42 is positioned on the rear end portion 32 side of the main cylinder 3 . It is arranged coaxially with the main cylinder 3 .

The main screw 4 has a screw shaft 43 and a plurality of flights 44 . A plurality of flights 44 are provided on the outer circumference of the screw shaft 43 along the axial direction of the screw shaft 43 . Also, in this example, the main screw 4 is a non-compression screw. That is, the plurality of flights 44 are provided at equal pitch intervals along the axial direction of the screw shaft 43, and all the flights 44 have the same outer diameter. That is, the groove depth of the main screw 4 is constant.

A driving device 5 is connected to the rear end portion 32 of the main cylinder 3 . The drive device 5 is connected to the rear end 42 of the main screw 4 disposed within the main cylinder 3 and is driven so that the main screw 4 can rotate about its axis within the main cylinder 3 . configured to Therefore, the main screw 4 is rotatably arranged within the main cylinder 3 . The main screw 4 is driven to rotate so that the material (resin, reinforcing material, etc.) supplied into the main cylinder 3 can be sent from the rear end 32 side of the main cylinder 3 to the front end 31 side. Configured.

FIG. 3 is a schematic partial cross-sectional view of the main transport device 2 taken along line III--III in FIG. As shown in FIG. 3 , a reinforcing material supply opening 34 is formed at a position near the rear end 32 of the side peripheral surface of the main cylinder 3 of the main transportation device 2 . The opening shape of the reinforcing material supply opening 34 is circular in this embodiment. A reinforcing material supply device 7 is arranged above the reinforcing material supply opening 34 .

The reinforcing material supplying device 7 has a reinforcing material quantitative supplying device 71 and a reinforcing material supplying hopper 72 . The reinforcing material constant supply device 71 is configured to supply a fixed amount of reinforcing material S to the reinforcing material supply hopper 72 . The reinforcing material supply hopper 72 has a container shape capable of receiving the reinforcing material S, and a reinforcing material storage space 72a in which the reinforcing material S is stored is formed inside. The reinforcing material S is supplied from the reinforcing material constant supply device 71 to the reinforcing material storage space 72a. A reinforcing material outlet passage 73 communicating with the reinforcing material storage space 72 a is formed at the lower end of the reinforcing material supply hopper 72 . It communicates with the supply opening 34 . Therefore, the reinforcing material S stored in the reinforcing material storage space 72 a of the reinforcing material supply hopper 72 is supplied to the inner space of the main cylinder 3 via the reinforcing material outlet passage 73 and the reinforcing material supply opening 34 . Thus, the reinforcing material supply device 7 is connected to the reinforcing material supply opening 34 and configured to be able to supply the reinforcing material S into the main cylinder 3 through the reinforcing material supply opening 34 . Further, the reinforcing material supply opening 34 is provided at a portion near the rear end portion 32 of the main cylinder 3 as described above. Therefore, the reinforcing material S stored in the reinforcing material storage space 72 a of the reinforcing material supply hopper 72 is supplied to the inner space near the rear end portion 32 of the main cylinder 3 .

Any reinforcing material S may be used as long as it improves the material properties of the molded body when mixed with the resin. Examples of the reinforcing material S include fiber reinforcing materials such as glass fiber and carbon fiber, and fillers such as calcium carbonate and talc. Typically, the reinforcement S is a fibrous reinforcement. When the reinforcing material is a fiber reinforcing material, the fiber reinforcing material supplied to the reinforcing material supply hopper 72 may be in the form of a bundle (chopped strand), or roving fibers may be supplied as the reinforcing material. It may be cut to the desired length before being fed to the hopper 72 . In addition, generally, the reinforcing material S is bundled with a binding material and formed to have a predetermined size.

FIG. 4 is a schematic partial cross-sectional view of the molten resin supply device 6 cut along the IV-IV line in FIG. As shown in FIG. 4 , the molten resin supply device 6 includes a sub-cylinder 61 , a sub-screw 62 , a drive device 63 , a resin material supply hopper 64 , and a resin material constant supply device 65 . 2, the resin material supply hopper 64 and the resin material constant supply device 65 are omitted.

The sub-cylinder 61 is a cylindrical member having an open front end 611 (left end in FIG. 4) and a rear end 612 (right end in FIG. 4), and a cylindrical internal space is formed therein. be. A plurality of sub-band heaters 92 are attached to the outer circumference of the sub-cylinder 61 . The sub-cylinder 61 is heated by operating the sub-band heater 92 . The material (resin) in the sub-cylinder 61 is heated by heating the sub-cylinder 61 . A temperature sensor is installed at an appropriate position of the sub-cylinder 61, and temperature information detected by this temperature sensor is input to a heater control device (not shown). The heater control device controls the operation of the subband heater 92 so that the detected temperature matches the set temperature. By individually controlling the plurality of sub-band heaters 92 , it is possible to set a plurality of different set temperatures along the axial direction of the sub-cylinder 61 .

A sub-screw 62 is arranged in the sub-cylinder 61 along the axial direction of the sub-cylinder 61 . 5 is a side view of the subscrew 62. FIG. As shown in FIG. 5, the sub-screw 62 has a leading end 621 and a trailing end 622 and is shaped like an elongated bar. As shown in FIG. 4 , the sub-screw 62 is positioned inside the sub-cylinder 61 such that the tip 621 side thereof is positioned on the front end portion 611 side of the sub-cylinder 61 and the rear end 622 is positioned on the rear end portion 612 side of the sub-cylinder 61 . is arranged coaxially with the sub-cylinder 61 in the cylindrical inner space of the .

As shown in FIG. 5, the sub-screw 62 has a screw shaft 623 and a plurality of flights 624 . A plurality of flights 624 are provided on the outer circumference of the screw shaft 623 along the axial direction of the screw shaft 623 . The subscrew 62 is a full flight screw commonly used in extrusion molding or injection molding. A first region 62A, a second region 62B, and a third region 62C are formed in the sub-screw 62 from its rear end 622 toward its tip 621 . The groove depth of the first region 62A (the distance from the outer periphery of the flight 624 to the outer periphery of the screw shaft 623) and the groove depth of the third region 62C are constant. Also, the groove depth of the first region 62A is deep, and the groove depth of the third region 62C is shallow. The groove depth of the second region 62B becomes shallower from the rear end 622 side toward the tip 621 side. Furthermore, the groove depth on the side closest to the rear end 622 of the second region 62B is equal to the groove depth of the first region 62A, and the groove depth on the side closest to the tip 621 of the second region 62B is the third region 62C. equal to the groove depth of

As shown in FIG. 4 , the driving device 63 is connected to the rear end portion 612 of the sub-cylinder 61 . The driving device 63 is connected to the rear end 622 of the sub-screw 62 disposed within the sub-cylinder 61, and is driven so that the sub-screw 62 can rotate about its axis within the sub-cylinder 61. configured to Therefore, the sub-screw 62 is rotatably arranged within the sub-cylinder 61 .

A resin material supply opening 613 is formed at a position near the rear end portion 612 of the side peripheral surface of the sub-cylinder 61 . The opening shape of the resin material supply opening 613 is circular in this embodiment. A resin material supply hopper 64 is connected to the resin material supply opening 613 . A resin material constant supply device 65 is arranged above the resin material supply hopper 64 . A resin material (resin pellet) is supplied from a resin material constant supply device 65 to a resin material supply hopper 64 .

The resin material constant supply device 65 is configured to be able to supply a constant amount of the resin material R to the resin material supply hopper 64 . The resin material supply hopper 64 has a container shape capable of receiving the resin material R, and a resin material storage space 64a in which the resin material R is stored is formed inside. A resin material R is supplied from a resin material constant supply device 65 to the resin material storage space 64a. A resin material outlet passage 66 communicating with the resin material storage space 64 a is formed at the lower end of the resin material supply hopper 64 . communicate. Therefore, the resin material R stored in the resin material storage space 64 a of the resin material supply hopper 64 is supplied to the internal space of the sub-cylinder 61 via the resin material outlet passage 66 and the resin material supply opening 613 . Here, the resin material supply opening 613 is provided at a portion near the rear end portion 612 of the sub-cylinder 61 as described above. Therefore, the resin material R stored in the resin material storage space 64a of the resin material supply hopper 64 is disposed in the area near the rear end portion 612 of the internal space of the sub-cylinder 61, that is, the first area 62A of the sub-screw 62. will be supplied to the region.

The resin material R may be spherical, cylindrical, or powdery. Moreover, the main resin component constituting the resin material R may be any thermoplastic resin (including general-purpose resins, engineering plastics, and super engineering plastics) generally used for resin molding.

In addition to the resin material R, the resin material supply hopper 64 may contain other additives such as modifiers, colorants, heat stabilizers, etc., as necessary (for example, according to the required characteristics of the product to be manufactured). can be supplied.

As shown in FIG. 2 , a molten resin supply opening 35 is formed in the side peripheral surface of the main cylinder 3 in addition to the reinforcing material supply opening 34 described above. A front end portion 611 of a sub-cylinder 61 of the molten resin supply device 6 is connected to the molten resin supply opening 35 . The internal space of the sub-cylinder 61 communicates with the internal space of the main cylinder 3 through the molten resin supply opening 35 . In addition, in FIG. 2, the reinforcing material supply opening 34 is indicated by a dashed line. As can be seen from FIG. 2, the molten resin supply opening 35 is formed closer to the front end portion 31 of the main cylinder 3 than the reinforcing material supply opening 34 is formed.

FIG. 6 is an enlarged view of part C in FIG. FIG. 6 shows the structure around the reinforcing material supply opening 34 formed in the main cylinder 3 . As shown in FIG. 6, among the flights 44 of the main screw 4 in the main cylinder 3, a flight 44A facing the reinforcing material supply opening 34 and a flight 44B adjacent to the front side of the flight 44A have a first slit. 441 is formed. The first slit 441 is opened in the outer peripheral surface of the flight 44 (44A, 44B) and formed by notching radially inward toward the center of the screw shaft 43 from the opening. Via this first slit 441, the front space and back space of flights 44A and 44B in which it is formed are communicated. Although the number of first slits 441 formed in one flight 44 is not particularly limited, it is preferably two or more. Moreover, the width of the first slit 441 is preferably equal to or greater than the size of the reinforcing material S supplied into the main cylinder 3 from the reinforcing material supply opening 34 . For example, if the reinforcing material is reinforcing fibers, the width of the first slit 441 should be equal to or greater than the width of the reinforcing fibers. More specifically, when the width of the reinforcing fiber is 0.5 mm, the width of the first slit 441 should be 0.5 mm or more.

FIG. 7 is an enlarged view of part D in FIG. 7 shows the structure around the molten resin supply opening 35 formed in the main cylinder 3. As shown in FIG. As shown in FIG. 7, among the flights 44 of the main screw 4 in the main cylinder 3, a flight 44C facing the molten resin supply opening 35 and a flight 44D adjacent to the front side of the flight 44C are provided with a second slit. 442 is formed. Similar to the first slit 441, the second slit 442 opens on the outer peripheral surface of the flight 44 (44C, 44D), and is notched radially inward from the opening toward the center of the screw shaft 43. be done. Via this second slit 442, the front space and rear space of the flights 44C and 44D in which it is formed communicate. The number of second slits 442 formed in one flight 44 is not particularly limited, but is preferably two or more.

8A and 8B are diagrams showing various configuration examples of the first slit 441 or the second slit 442. FIG. FIG. 8A shows an example in which a first slit 441 or a second slit 442 is formed over the entire area from two positions on the outer peripheral surface of the flight 44 to the inner peripheral surface (the outer peripheral surface of the screw shaft 43). FIG. 8B shows an example in which a first slit 441 or a second slit 442 is formed over a predetermined area from two positions on the outer peripheral surface of the flight 44 toward the inner peripheral surface. FIG. 8C shows an example in which the first slits 441 or the second slits 442 are formed over the entire area from six positions on the outer peripheral surface of the flight 44 to the inner peripheral surface. The first slit 441 or the second slit 442 is not limited to the example shown in FIG. 8, and can be modified in various ways. For example, the example shown in FIG. may be formed by Further, the first slit 441 or the second slit 442 formed in the adjacent flights 44 may be formed at the same position when viewed from the axial direction of the screw shaft 43, or may be formed at different positions. . Furthermore, although it is preferable that a plurality of first slits 441 or second slits 442 are formed in one flight 44 at regular intervals, they may be formed at irregular intervals.

In addition, when the main screw 4 is an injection screw, the screw retreats when the resin to be injected is metered, so that a plurality of flights face the reinforcing material supply opening 34 and the molten resin supply opening. In this case, it is preferable to provide the first slit 441 in each of the plurality of flights facing the reinforcing material supply opening 34 and provide the second slit 442 in each of the plurality of flights facing the molten resin supply opening. Further, when the main screw 4 is an extrusion screw, a first slit 441 is provided in a flight facing the reinforcing material supply opening 34 and a plurality of flights provided from the flight toward the tip of the screw, and the molten resin supply opening 35 It is preferable to provide the second slit 442 in the flight facing the screw and a plurality of flights 442 provided from the flight toward the tip of the screw.

The control device 8 controls the drive state of the drive device 5 of the main transport device 2, the drive state of the drive device 63 of the molten resin supply device 6, the operation state of the reinforcing material constant supply device 71, the operation state of the resin material constant supply device 65, etc.

Also, as shown in FIG. 2, a resin pressure sensor 45 is attached to the internal space of the main cylinder 3 . The resin pressure sensor 45 is configured to detect the resin pressure of the molten resin supplied from the molten resin supply device 6 to the main cylinder 3 through the molten resin supply opening 35 . The detected resin pressure is input to the control device 8 .

The operation of the manufacturing apparatus 1 having the above configuration will be described below.

First, the main band heater 91 and the sub-band heater 92 are operated. Thereby, the temperature of the main cylinder 3 and the temperature of the sub-cylinder 61 are adjusted to the set temperatures. The preset temperature of the sub-cylinder 61 is set to a temperature higher than the melting point of the resin material used. For example, when the resin material to be used is polypropylene, the preset temperature of the sub-cylinder 61 is set to about 220.degree. On the other hand, in this embodiment, the set temperature of the main cylinder 3 is set to different temperatures across the molten resin supply opening 35 . The temperature of the area between the molten resin supply opening 35 and the front end portion 31 of the main cylinder 3, that is, the area in front of the molten resin supply opening 35 (area 3A in FIG. 2) is higher than the set temperature of the sub-cylinder 61. is set to a slightly higher temperature. For example, when the set temperature of the sub-cylinder 61 is about 220°C, the temperature of the region 3A is set to about 270°C, for example. On the other hand, in the main cylinder 3, the temperature of the area between the reinforcing material supply opening 34 and the molten resin supply opening 35, that is, the area behind the molten resin supply opening 35 (area 3B in FIG. 2) is It is set based on the binding state of the reinforcing material S. The reason why the temperature of the region 3B is set as described above is as follows. That is, only the reinforcing material S flows in the region 3B. Further, as described above, the reinforcing material S is bundled with a binding material and formed to have a predetermined size. If the reinforcing material S bundled with the binding material is heated before being mixed with the molten resin and the binding material is melted, the reinforcing material S becomes flocculent and cannot be transported. Therefore, in the region 3B where only the reinforcing material S is transported, the temperature is set to a temperature that does not melt the binding material that binds the reinforcing material S so that the reinforcing material S is transported without being unbundled (for example, defibrated). set. For example, when an olefin-based (polypropylene) binding material is used, the temperature of the region 3B is set to about 140° C., which is about 20° C. lower than the melting point (for example, 160° C.) of the binding material.

After the temperature of the main cylinder 3 and the temperature of the sub-cylinder 61 are adjusted to the set temperatures, the reinforcing material constant supply device 71 and the resin material constant supply device 65 of the molten resin supply device 6 are operated. By operating the reinforcing material quantitative supply device 71, a certain amount of reinforcing material S is supplied to the reinforcing material supply hopper 72, and further, a certain amount of reinforcing material S is supplied from the reinforcing material supplying hopper 72 into the main cylinder 3 through the reinforcing material supply opening 34. Material S is supplied (reinforcing material supply step). The reinforcing material S supplied from the reinforcing material supply hopper 72 to the main cylinder 3 is shaped into chopped strands with a binding agent, for example. A constant amount of resin material R is supplied to the resin material supply hopper 64 by the operation of the resin material constant supply device 65, and further, a constant amount of the resin material R is supplied from the resin material supply hopper 64 into the sub-cylinder 61 through the resin material supply opening 613. of resin material R is supplied.

Further, the drive device 5 of the main transport device 2 and the drive device 63 of the molten resin supply device 6 are driven. When the drive 5 of the main transport device 2 is driven, the main screw 4 rotates within the main cylinder 3 . As a result, the reinforcing material S supplied into the main cylinder 3 is transported from the rear end portion 32 side of the main cylinder 3 toward the front end portion 31 side (reinforcing material transportation step). It should be noted that until the reinforcing material S reaches the formation position of the molten resin supply opening 35, the setting temperature of the region 3B is low, so that the reinforcing material S is bound with a binding agent (that is, in a state where the binding is not untied). Material S is transported.

Further, when the driving device 63 of the molten resin supply device 6 is driven, the sub-screw 62 rotates within the sub-cylinder 61 . As a result, the resin material R supplied into the sub-cylinder 61 is transported from the rear end portion 612 side of the sub-cylinder 61 toward the front end portion 611 side. Also, the resin material R is compressed and kneaded when passing through the second region 62B of the sub-screw 62 . Further, the resin material R is heated in the sub-cylinder 61 so that the resin material R is melted.

The resin (molten resin) melted by the molten resin supply device 6 is supplied into the main cylinder 3 from the front end portion 611 of the sub-cylinder 61 through the molten resin supply opening 35 . In this manner, the molten resin supply device 6 is connected to the molten resin supply opening 35 and configured to supply the molten resin to the inside of the main cylinder 3 through the molten resin supply opening 35 .

Here, as described above, the molten resin supply opening 35 is positioned closer to the front end portion 31 than the position where the reinforcing material supply opening 34 is formed in the side peripheral surface of the main cylinder 3 . Accordingly, the reinforcing material S flows to the position where the molten resin is supplied into the main cylinder 3 through the molten resin supply opening 35 . That is, the molten resin supplied to the main cylinder 3 merges with the reinforcing material S flowing inside the main cylinder 3 (merging step). The reinforcing material S is impregnated with the molten resin that joins the reinforcing material. The molten resin impregnated in the reinforcing material S is further kneaded together with the reinforcing material S by the rotation of the main screw 4, and is transported to the front end portion 31 side of the main cylinder 3, and the reinforcing material S is dispersed in the molten resin. (dispersion process). Further, the reinforcing material S is sufficiently heated by the heat of the molten resin supplied from the molten resin supply opening 35 and the heat from the area 3A of the main cylinder 3, and the binding agent binding the reinforcing material S is melted by this heating. do. Therefore, the reinforcing material S is unbunched (for example, unfiberized) in the region 3A. This makes the reinforcement more dispersed. Then, the molten resin in which the reinforcing material S is dispersed is discharged from the front end portion 31 of the main cylinder 3 as reinforcing material-containing molten resin. FIG. 9 is a diagram showing how materials flow in the main cylinder 3 of the main transport device 2 and the sub-cylinder 61 of the molten resin supply device 6 shown in FIG.

Further, the control device 8 inputs the resin pressure in the main cylinder 3 from the resin pressure sensor 45 while the drive device 5 and the drive device 63 are being driven, and the input resin pressure reaches the preset set resin pressure as a low pressure. The operation of the resin material constant supply device 65 is feedback-controlled so as to match. Here, since the lower the resin pressure in the main cylinder 3, the better, the set resin pressure is also set to a low pressure. The set resin pressure may be set to 0 Pa. In this way, the control device 8 controls the molten resin supply device 6 so that the resin pressure of the molten resin supplied into the main cylinder 3 through the molten resin supply opening 35 is low (for example, the resin pressure is 0). Control the amount of molten resin supplied into the main cylinder 3

The reinforcing material-containing molten resin discharged from the front end portion 31 of the main cylinder 3 is extruded, for example, by being passed through an extrusion die. After that, it is cooled and cut into a suitable size to produce a reinforced resin molding. Further, by injecting a reinforcing material-containing molten resin from the front end portion 31 of the main cylinder 3 into an injection mold, a reinforced resin molded body can be injection molded. In this case, the reinforcing material-containing molten resin is accumulated in the front end portion 31 of the main cylinder 3 by retracting the main screw 4 while rotating in the main cylinder 3 . After that, the rotation of the main screw 4 is stopped, and then the main screw 4 advances to inject the reinforcement-containing molten resin pooled at the front end portion 31 of the main cylinder 3 into the injection mold. Further, the reinforcement-containing molten resin discharged from the front end portion 31 of the main cylinder 3 is once filled into the injection cylinder, and the thus-filled reinforcement-containing molten resin is injected into the injection mold using an injection plunger. By doing so, the reinforcing material-containing molten resin can also be injection molded. In this case, it is not necessary to retract and advance the main screw 4 within the main cylinder 3 . Thus, a reinforced resin molded body is manufactured using the manufacturing apparatus 1 according to the present embodiment.

By the way, in the conventional method as disclosed in Patent Document 1, for example, the reinforcing material joins the molten resin flowing through the cylinder. That is, conventionally, the reinforcing material is side-fed into the molten resin in the cylinder. In contrast, in this embodiment, the molten resin is side-fed to the reinforcing material S in the main cylinder 3 . In other words, the manufacturing method of the reinforced resin molding according to the present embodiment is characterized in that the material to be side-fed and the material to be side-fed are opposite to those of the conventional manufacturing method.

The bulk density of the reinforcing material S (for example, the bulk density of reinforcing fibers) is sufficiently smaller than the bulk density of the molten resin, and many voids exist in the reinforcing material S flowing through the main cylinder 3 . Therefore, when the molten resin is side-fed into the reinforcing material S flowing through the main cylinder 3 as in this embodiment, the molten resin supplied to the main cylinder 3 easily impregnates the reinforcing material S in the main cylinder 3 . Therefore, the molten resin can be supplied to the main cylinder 3 without limiting the supply amount of the molten resin. That is, it is possible to produce a reinforced resin molded article without lowering its transportability (plasticizing ability).

Further, since the reinforcing material S has a low bulk density as described above, even if the amount of the reinforcing material S is increased, the reinforcing material S can be easily impregnated with the molten resin. Therefore, it is possible to manufacture a reinforced resin molded article having a high reinforcing material content.

Further, the position where the reinforcing material S is supplied to the main cylinder 3, that is, the position of the reinforcing material supply opening 34, is a rear end portion of the position where the molten resin is supplied to the main cylinder 3, that is, the position of the molten resin supply opening 35. 32 side. Therefore, no molten resin exists at the position where the reinforcing material S is supplied to the main cylinder 3 . Therefore, when the reinforcing material S is supplied to the main cylinder 3, the reinforcing material S is not subjected to resin pressure. Therefore, it is possible to prevent the reinforcing material S from being broken by the resin pressure at the supply position of the reinforcing material S.

Further, the reinforcing material S that has entered the main cylinder 3 from the reinforcing material supply opening 34 fills the clearance between the flights 44 of the main screw 4 facing the reinforcing material supply opening 34 and the inner wall surface of the main cylinder 3. Sometimes you can pass through. At this time, in the prior art (for example, Patent Document 1), the molten resin exists in the supply region of the reinforcing material S, so the clearance is narrowed by the molten resin. For this reason, there is a high possibility that the reinforcing material S is sandwiched in the narrowed clearance, and the reinforcing material S thus sandwiched by the clearance receives a shearing force due to the rotation of the screw, resulting in breakage of the reinforcing material S. Regarding this point, in the present embodiment, since the molten resin does not exist in the supply region of the reinforcing material S, the clearance is not narrowed by the molten resin. Therefore, the possibility of breakage of the reinforcing material S due to the reinforcing material being sandwiched between the clearances in the supply area of the reinforcing material S can be reduced.

Furthermore, in this embodiment, the first slit 441 is formed in at least the flight 44</b>A of the flights 44 of the main screw 4 facing the reinforcing material supply opening 34 . Therefore, even if the reinforcing material S supplied into the main cylinder 3 from the reinforcing material supply opening 34 is caught in the clearance between the outer peripheral surface of the flight 44A and the inner wall surface of the main cylinder 3, the reinforcing material S is By falling into the first slit 441, the pinching described above is eliminated. Therefore, it is possible to more effectively prevent breakage of the reinforcing material S due to the reinforcing material S being sandwiched in the clearance.

Further, after the molten resin is supplied to the main cylinder 3 through the molten resin supply opening 35, the reinforcing material S is kneaded with the molten resin and transported toward the front end portion 31 of the main cylinder 3. Since it is a non-compression screw, the molten resin and reinforcing material S are not compressed during transportation. Therefore, it is possible to prevent the reinforcing material S from being broken due to the compressive force during transportation of the reinforcing material S and the molten resin.

A second slit 442 is formed in at least the flight 44</b>C facing the molten resin supply opening 35 among the flights of the main screw 4 . Therefore, part of the molten resin supplied into the main cylinder 3 from the molten resin supply opening 35 is transported to the front end portion 31 side of the main cylinder 3 through the second slit 442 . In this manner, a flow of the supplied molten resin toward the front end portion 31 side of the main cylinder 3 is formed, so that the molten resin flows toward the rear end portion 32 side of the main cylinder 3, that is, the molten resin backs up. flow can be prevented. As a result, the molten resin is prevented from backflowing and blocking the flow of the reinforcing material S, and by smoothly flowing the molten resin in the regular direction, the resin at the confluence position of the molten resin and the reinforcing material S pressure can be lowered. Since the resin pressure at the joining position is reduced in this manner, breakage of the reinforcing member S due to the resin pressure is further prevented.

As described above, according to the present embodiment, it is possible to suppress breakage of the reinforcing material during molding, and to manufacture a reinforced resin molded body with a high reinforcing material content.

(Example 1)
FIG. 10 is a diagram showing a manufacturing process of a sample of the reinforced resin molding according to Example 1. FIG. As shown in FIG. 10, in Example 1, a molten resin containing glass fibers (reinforcement) (glass fiber-containing molten resin) was produced using the production apparatus 1 described in the above embodiment, and the produced glass The fiber-containing molten resin was passed through an extrusion mold 101 to form a flat plate. After that, the molded product was press-molded using the press-molding die 102 to prepare a sample having a desired shape.

(Example 2)
FIG. 11 is a diagram showing a manufacturing process of a sample of the reinforced resin molding according to Example 2. FIG. As shown in FIG. 11, in Example 2, a glass fiber-containing molten resin was produced using the production apparatus 1 described in the above embodiment, and the produced glass fiber-containing molten resin was injected into an injection mold 103. After that, the molded body was taken out from the injection molding die 103 through the holding pressure and cooling processes. Thus, a sample having the same shape as the sample according to Example 1 was produced.

(Example 3)
12A and 12B are diagrams showing a manufacturing process of a sample of the reinforced resin molding according to Example 3. FIG. As shown in FIG. 12, in Example 3, first, as shown in FIG. The contained molten resin was filled in the injection cylinder 104 . After completion of filling, as shown in FIG. 12B, the glass fiber-containing molten resin in the injection cylinder 104 was injected into the injection mold 103 using the plunger 105 . After that, the molded body was taken out from the injection molding die 103 through the holding pressure and cooling processes. Thus, a sample having the same shape as the sample according to Example 1 was produced.

(Comparative example)
FIG. 13 is a diagram showing a manufacturing process of a sample of a reinforced resin molding according to a comparative example. As shown in FIG. 13, in the comparative example, samples were manufactured using an in-line injection molding machine 110 . Specifically, the resin material was supplied from the resin material supply hopper 111 to the injection cylinder 112, and the glass fiber (reinforcing material) was supplied from the reinforcement material supply hopper 113 to the injection cylinder 112 by side feeding. Then, the screw 114 in the injection cylinder 112 was rotated to knead and melt these, and then inject them into the injection mold 115 . After that, the molded body was taken out from the injection mold 115 through the holding pressure and cooling processes. Thus, a sample having the same shape as the sample according to Example 2 was produced.

(evaluation)
1. Measurement of fiber length in sample Glass reinforcing fibers were extracted from the samples produced in each example and comparative example. After that, the length of the extracted glass reinforcing fibers was measured, and the average value of the measured lengths was calculated as the residual fiber length.
2. Evaluation of Fiber Dispersibility The appearance of the samples prepared in each example and comparative example was observed, and the number of clumps of glass reinforcing fibers appearing on the surface, that is, the number of fiber clumps that were not unbundled was measured. When the number of measured fiber clumps is 0, the dispersibility is evaluated as good (○), and when the number of fiber clumps is small (1 to 9), the dispersibility is evaluated as insufficient (Δ). However, when the number of fiber clumps was large (10 or more), the dispersibility was evaluated as poor (x).

ここで、表１において、ＰＰは、ポリプロピレンであり、ＧＦはガラス繊維であり、ＭＡ－ｇ－ｐｐは、無水マレイン酸変性ポリプロピレンである。 Table 1 shows the type and compounding ratio of the resin material used in each example and comparative example, the type, form, compounding ratio and initial fiber length of the reinforcing fiber, and the type and compounding ratio of the additive (modifier). .

Here, in Table 1, PP is polypropylene, GF is glass fiber, and MA-g-pp is maleic anhydride-modified polypropylene.

Table 2 shows the compression ratio of the screws (main screw 4, sub-screw 62) used in each example, the number and width of the first slit (441) formed in one flight, and the The number and width of the second slits (442) are indicated.

Further, in each embodiment, the set temperature of the main cylinder (3) (this set temperature is the temperature of the front end side (region 3A) of the main cylinder from the molten resin supply opening 35 shown in FIG. 2) was 270°C. In addition, the set temperature of the sub-cylinder (61) was set to 220°C. Incidentally, in the comparative example, the set temperature of the injection cylinder was set to 270°C. Further, in each embodiment, the operation of the resin material constant supply device 65 was feedback-controlled so that the resin pressure detected by the resin pressure sensor was zero.

Table 3 shows the evaluation results of the samples produced in each example and comparative example. For Example 2 and Comparative Example, the plasticizing capacity (transporting capacity) was also measured. The measurement results are also shown in Table 3.

As can be seen from Table 3, the dispersibility was good in each example and comparative example. Further, in each example and comparative example, the blending ratio of the glass fiber is as high as 40 wt%. However, the residual fiber length measured in each example is longer than the residual fiber length measured in the comparative example. From this, it can be seen that the production apparatus and production method according to the present embodiment can produce a reinforced resin molded product with a high reinforcing material content and a low frequency of reinforcing fiber breakage (long residual fiber length). Verified. Furthermore, it was verified that Example 2 was superior to Comparative Examples in terms of plasticizing ability.

Although the embodiments of the present invention have been described above, the present invention should not be limited to the above embodiments. For example, in the above embodiment, an example of using a non-compression screw as the main screw 4 was shown, but a screw with a small compression ratio can be used instead of the non-compression screw. This is because if the compression ratio is small, the degree of breakage of the reinforcement due to the rotation of the main screw 4 within the main cylinder 3 can be reduced. In this case, a screw having a compression ratio of 2.0 or less can be used as the main screw 4 . Also, a variable pitch screw 4' as shown in FIG. 14 can be employed as the main screw. In this variable pitch screw 4', the pitch between flights in a region near the tip 41' is narrower than the pitch between flights in a region on the rear end 42' side of that region. By using such a variable pitch screw 4' as the main screw 4, the dispersibility of the reinforcing material in the molten resin can be improved without increasing the resin pressure in the main cylinder 3 so much. Further, in order to improve the dispersibility of the reinforcing material in the molten resin, a mixing element such as Maddock type, Dulmage type, pin type, etc. can be attached to the tip of the main screw 4 as required. A flighted screw can also be used. In this manner, the present invention can be modified without departing from its gist.

DESCRIPTION OF SYMBOLS 1... Manufacturing apparatus, 2... Main transport apparatus, 3... Main cylinder (cylinder), 31... Front end part, 32... Rear end part, 34... Reinforcing material supply opening, 35... Molten resin supply opening, 4... Main screw (screw ), 41... tip, 42... rear end, 43... screw shaft, 44, 44A, 44B, 44C, 44D... flight, 441... first slit, 442... second slit, 45... resin pressure sensor, 5... drive device 6 Molten resin supply device 61 Sub cylinder 611 Front end 612 Rear end 62 Sub screw 63 Drive device 64 Resin material supply hopper 65 Resin material constant supply device 66 Resin material outlet passage 7 Reinforcing material supply device 71 Reinforcing material constant supply device 72 Reinforcement material supply hopper 73 Reinforcement material exit passage 8 Control device 91 Main band heater 92 Sub band Heater 613... Resin material supply opening, R... Resin material, S... Reinforcing material

Claims (6)

a cylinder formed in a cylindrical shape having a front end and a rear end, and having a reinforcing material supply opening and a molten resin supply opening positioned closer to the front end than the reinforcing material supply opening is formed on a side peripheral surface of the cylinder;
a reinforcing material supply device connected to the reinforcing material supply opening and configured to supply the reinforcing material to the inside of the cylinder through the reinforcing material supply opening;
a molten resin supply device connected to the molten resin supply opening and configured to supply the molten resin into the cylinder through the molten resin supply opening;
It is arranged inside the cylinder along the axial direction of the cylinder, and can send the material supplied to the inside of the cylinder from the rear end side of the cylinder to the front end side by rotating it. a screw configured to
with
An apparatus for manufacturing a reinforced resin molding, wherein a first slit opening to an outer periphery is formed in a flight of the screw that faces the reinforcing material supply opening formed in the cylinder . a cylinder formed in a cylindrical shape having a front end and a rear end, and having a reinforcing material supply opening and a molten resin supply opening positioned closer to the front end than the reinforcing material supply opening is formed on a side peripheral surface of the cylinder;
a reinforcing material supply device connected to the reinforcing material supply opening and configured to supply the reinforcing material to the inside of the cylinder through the reinforcing material supply opening;
a molten resin supply device connected to the molten resin supply opening and configured to supply the molten resin to the inside of the cylinder through the molten resin supply opening;
It is arranged inside the cylinder along the axial direction of the cylinder, and can send the material supplied to the inside of the cylinder from the rear end side of the cylinder to the front end side by rotating it. a screw configured to
with
An apparatus for manufacturing a reinforced resin molded body, wherein a second slit opening to an outer periphery is formed in a flight of the screw that faces the molten resin supply opening formed in the cylinder. a cylinder formed in a cylindrical shape having a front end and a rear end, and having a reinforcing material supply opening and a molten resin supply opening positioned closer to the front end than the reinforcing material supply opening is formed on a side peripheral surface of the cylinder;
a reinforcing material supply device connected to the reinforcing material supply opening and configured to supply the reinforcing material to the inside of the cylinder through the reinforcing material supply opening;
a molten resin supply device connected to the molten resin supply opening and configured to supply the molten resin to the inside of the cylinder through the molten resin supply opening;
It is arranged inside the cylinder along the axial direction of the cylinder, and can send the material supplied to the inside of the cylinder from the rear end side of the cylinder to the front end side by rotating it. a screw configured to
The molten resin is supplied from the molten resin supply device into the cylinder so that the resin pressure of the molten resin supplied into the cylinder through the molten resin supply opening matches a set resin pressure preset as a low pressure. a controller for controlling the amount of
A manufacturing apparatus for a reinforced resin molded body. In the apparatus for manufacturing a reinforced resin molded body according to claim 2,
An apparatus for manufacturing a reinforced resin molding, wherein a first slit opening to an outer periphery is formed in a flight of the screw that faces the reinforcing material supply opening formed in the cylinder. In the apparatus for manufacturing a reinforced resin molding according to any one of claims 1, 2, and 4,
The molten resin is supplied from the molten resin supply device into the cylinder so that the resin pressure of the molten resin supplied into the cylinder through the molten resin supply opening matches a set resin pressure preset as a low pressure. An apparatus for manufacturing a reinforced resin molding, comprising a control device for controlling the amount. a reinforcing material supply step of supplying the reinforcing material into a cylindrically formed cylinder having a front end and a rear end;
a reinforcing material transporting step of rotating a screw provided in the cylinder to transport the reinforcing material supplied into the cylinder to the front end side;
A confluence step of supplying the molten resin into the cylinder to join the molten resin with the reinforcing material flowing in the cylinder;
a control step of controlling the amount of molten resin supplied into the cylinder so that the resin pressure of the molten resin merged in the merging step matches a set resin pressure preset as a low pressure;
A dispersing step of further transporting the molten resin and the reinforcing material merged in the merging step to the front end portion side by rotating the screw and dispersing the reinforcing material in the molten resin;
A method for producing a reinforced resin molded body.

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