Extrusion device and method for producing resin composition

Abstract

To provide an extrusion apparatus that can impart a stretching activity to a resin raw material while preventing clogging of the resin raw material.SOLUTION: There is provided an extrusion apparatus (1) comprising: a cylinder (2) into which a resin raw material is supplied from a hopper (3); a discharging unit (4) that is arranged at an end part of the cylinder (2) and from which a kneaded resin raw material is discharged; a screw (5) that is rotatably inserted into the cylinder (2), kneads the resin raw material, and conveys the resin raw material to a side of the discharging unit (4); a partitioning unit (6) that is arranged between the cylinder (2) and the screw (5) and is configured in that a penetration part (61) through which the resin raw material passes is formed; a first flow passage that is formed between the screw (5) and the partitioning unit (6) and through which the resin raw material passes; and a second flow passage that is formed between the cylinder (2) and the partitioning unit (6) and through which the resin raw material passes.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an extrusion apparatus and a method for producing a resin composition. [Background technology]

[0002] The extrusion device is configured to impart not only a shearing action but also an elongation action to the resin raw material in order to improve the kneading performance of the resin raw material. For example, the extrusion devices of Patent Documents 1 and 2 are configured such that the resin raw material, to which a shearing action has been imparted by the screw in a conveying section separated by a partition wall formed in the screw, flows into a passage formed in the screw that extends in the axial direction of the screw and connects adjacent conveying sections, and is suddenly squeezed, thereby imparting an elongation action to the resin raw material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-227053 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-203576 Summary of the Invention [Problem to be solved by the invention]

[0004] The present applicant has found the following problem: The extrusion devices of Patent Documents 1 and 2 can impart not only a shearing action but also an elongation action to the resin raw material, but there is a possibility that the resin raw material may become clogged in the passage.

[0005] The present disclosure has been made in consideration of such problems, and provides an extrusion device and a method for producing a resin composition that can impart an elongation effect to a resin raw material while suppressing clogging of the resin raw material. [Means for solving the problem]

[0006] An extrusion device according to one aspect of the present disclosure includes: a cylinder to which resin raw material is supplied from a hopper; a discharge portion provided at an end of the cylinder and configured to discharge the kneaded resin raw material; a screw that is rotatably inserted inside the cylinder and kneads the resin raw material while transporting it to the discharge portion; a partition portion disposed between the cylinder and the screw and having a through-hole formed therein through which the resin raw material passes; a first flow path formed between the screw and the partition portion and through which the resin raw material passes; a second flow path formed between the cylinder and the partition portion, through which the resin raw material passes; Equipped with.

[0007] A method for producing a resin composition according to one embodiment of the present disclosure includes: a step of conveying the resin raw material supplied inside the cylinder to the side of the discharge portion by a screw; a step of causing the resin raw material to flow in a first flow path formed between the screw and the partition part through a through-hole in the partition part disposed between the cylinder and the screw; a step of causing the resin raw material to enter a second flow path formed between the cylinder and the partition part through a through-hole in the partition part and flow in the second flow path; Equipped with The resin raw material is accelerated when passing through the through-hole of the partition. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to realize an extrusion device and a method for producing a resin composition that can impart an elongation effect to a resin raw material while suppressing clogging of the resin raw material. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a partial cross-sectional view showing the extrusion device according to the embodiment. [Figure 2]3 is an enlarged partial cross-sectional view showing a discharge portion side of the extrusion device according to the embodiment. FIG. [Figure 3] 3 is a cross-sectional view showing a first portion and a third portion of a cylinder in the extrusion device of the embodiment. FIG. [Figure 4] FIG. 2 is a perspective view showing a screw in the extrusion device according to the embodiment. [Figure 5] FIG. 2 is a perspective view showing a partition section in the extrusion device according to the embodiment. [Figure 6] 4A and 4B are diagrams for explaining the flow of the resin raw material in the Y-axis + side portion in the cylinder of the extrusion device according to the embodiment. [Figure 7] FIG. 1 is a diagram showing the results of a dispersion test of a composite material obtained by kneading resin raw materials using a general twin-screw extrusion device. [Figure 8] FIG. 8 is an enlarged view of part VIII in FIG. 7. [Figure 9] 10 is a diagram showing the results of a dispersion test of a composite material obtained by kneading a resin raw material using the extrusion device of the embodiment. FIG. [Figure 10] FIG. 10 is an enlarged view of the X portion of FIG. 9. [Figure 11] FIG. 1 is a diagram showing the tensile modulus of a test piece molded from a composite material obtained by kneading a resin raw material using a general twin-screw extrusion device, and a test piece molded from a resin raw material kneaded using the extrusion device of this embodiment. [Figure 12] FIG. 1 is a diagram showing the flexural modulus of a test piece molded from a resin raw material kneaded using a general twin-screw extrusion device and a test piece molded from a resin raw material kneaded using the extrusion device of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Specific embodiments to which the present disclosure is applied will be described in detail below with reference to the drawings. However, the present disclosure is not limited to the following embodiments. In addition, the following description and drawings have been simplified as appropriate for clarity of explanation.

[0011] First, the configuration of the extrusion device of this embodiment will be described. Fig. 1 is a partial cross-sectional view showing the extrusion device of this embodiment. Fig. 2 is a partial cross-sectional view showing an enlarged view of the discharge section side of the extrusion device of this embodiment.

[0012] In the following explanation, for clarity, a three-dimensional (XYZ) coordinate system will be used. Here, the term "resin raw material" in the following explanation may be used as a general term including not only the state before melting but also the molten state.

[0013] The extrusion device 1 of this embodiment is suitable for kneading and extruding resin raw materials to form composite materials (i.e., resin compositions such as resin strands, resin pellets, or resin films) that are used in, for example, injection molding machines, extrusion molding machines, etc. As shown in Figures 1 and 2, the extrusion device 1 includes a cylinder 2, a hopper 3, a discharge section 4, a screw 5, a partition section 6, a drive section 7, and a heating section 8.

[0014] Fig. 3 is a cross-sectional view showing the first and third parts of the cylinder in the extrusion device of this embodiment. As shown in Figs. 1 to 3, the cylinder 2 has a substantially cylindrical shape and extends in the Y-axis direction. A cavity 21 and a partition wall (second partition wall) 22 are formed on the inner circumferential surface of the part of the cylinder 2 on the +Y-axis side.

[0015] 1 to 3, the cavity portions 21 are cylindrical recessed portions having an outer diameter larger than the diameter of the partition wall portion 22, and extend in the Y-axis direction. The cavity portions 21 are arranged, for example, at intervals in the Y-axis direction.

[0016] 1 to 3, the partition wall portion 22 is disposed between the cavity portions 21 in the Y-axis direction. The partition wall portion 22 is, for example, a cylindrical protrusion having an inner diameter substantially equal to the outer diameter of the partition portion 6, the details of which will be described later, and extends in the Y-axis direction.

[0017] Such a cylinder 2 is configured as a divided structure, for example, as shown in Figure 1, consisting of a first part 23 in which a cavity part 21 and a partition part 22 are formed, a second part 24 in which a hopper 3 is provided, and a third part 25 which is the other part.

[0018] The first, second, and third parts 23, 24, and 25 can be connected using, for example, bolts passed through through holes in flanges formed on each part. However, the number of parts into which the cylinder 2 is divided is not limited, and can be changed as appropriate depending on the length of the cylinder 2 in the Y-axis direction, the shape of the screw 5, and the like.

[0019] The hopper 3 supplies the resin raw material to the inside of the cylinder 2. As shown in Fig. 1, the hopper 3 is provided in the second portion 24 of the cylinder 2. Here, the hopper 3 stores a plurality of types of resin raw materials.

[0020] The kneaded resin raw material is discharged from the discharge unit 4. As shown in Figures 1 and 2, the discharge unit 4 is provided at the end of the cylinder 2 on the +Y axis side, and has a discharge port 41 that penetrates the discharge unit 4 in the Y axis direction.

[0021] 1, the screw 5 extends in the Y-axis direction and has a spiral flight 51. The screw 5 is connected to the drive unit 7 and passes through the inside of the cylinder 2, with the negative end of the screw 5 on the Y-axis side protruding from the negative end of the cylinder 2 on the Y-axis side.

[0022] Fig. 4 is a perspective view showing a screw in the extrusion device of this embodiment. As shown in Fig. 4, the screw 5 includes a conveying section 52, a kneading section 53, and a partition section (first partition section) 54. The conveying section 52 conveys the resin raw material to the + side of the Y axis while plasticizing it.

[0023] 1, the conveying portion 52 is disposed inside the second portion 24 and the third portion 25 of the cylinder 2. The diameter of the conveying portion 52 (i.e., the diameter of the outer peripheral end of the flight 51a of the conveying portion 52) is, for example, approximately equal to the inner diameter of the second portion 24 and the third portion 25 of the cylinder 2.

[0024] The kneading section 53 kneads the resin raw material and transports it toward the + side of the Y axis. As shown in Fig. 1, the kneading section 53 is disposed on the + side of the Y axis with respect to the transport section 52, and is disposed, for example, inside the first section 23 of the cylinder 2. The diameter of the kneading section 53 (i.e., the diameter of the outer circumferential end of the flight 51b of the kneading section 53) is, for example, approximately equal to the inner diameter of the partition section 6, the details of which will be described later.

[0025] The kneading sections 53 are arranged at intervals in the Y-axis direction, for example, as shown in Figure 4, and include a first section 53a on the + side of the Y-axis, a second section 53b on the - side of the Y-axis, and a third section 53c between the first section 53a and the second section 53b.

[0026] 2, the first portion 53a is disposed on the positive Y-axis side of the first portion 23 of the cylinder 2. The second portion 53b is disposed on the negative Y-axis side of the first portion 23 of the cylinder 2. The third portion 53c is disposed at approximately the center of the first portion 23 of the cylinder 2 in the Y-axis direction, straddling the partition wall portion 22 of the cylinder 2.

[0027] 2 and 4, the partition wall 54 is disposed between the first portion 53a and the third portion 53c of the kneading section 53, and between the third portion 53c and the second portion 53b of the kneading section 53. The partition wall 54 is a cylindrical protrusion having a diameter substantially equal to the inner diameter of the partition portion 6, the details of which will be described later.

[0028] At this time, the partition wall portion 54 on the +Y-axis side is positioned approximately in the center of the Y-axis direction in the cavity portion 21 on the +Y-axis side of the cylinder 2, as shown in Figure 2, and the partition wall portion 54 on the -Y-axis side is positioned approximately in the center of the Y-axis direction in the cavity portion 21 on the -Y-axis side of the cylinder 2.

[0029] Therefore, as shown in Figure 2, at least the Y-axis - side portion of the first part 53a of the kneading section 53 is arranged so as to be covered by the Y-axis + side portion of the cavity part 21 on the Y-axis + side of the cylinder 2, and the Y-axis + side portion of the third part 53c of the kneading section 53 is arranged so as to be covered by the Y-axis - side portion of the Y-axis + side of the cavity part 21 on the Y-axis + side of the cylinder 2.

[0030] Also, as shown in Figure 2, at least the portion of the second part 53b of the kneading section 53 on the +Y-axis side is arranged so as to be covered by the portion of the cavity part 21 on the -Y-axis side of the cylinder 2 on the -Y-axis side, and the portion of the third part 53c of the kneading section 53 on the -Y-axis side is arranged so as to be covered by the portion of the cavity part 21 on the -Y-axis side of the cylinder 2 on the +Y-axis side.

[0031] Here, although the detailed mechanism will be described later, it is preferable that the flight angle θ1 of the flight 51b of the kneading section 53 is smaller than the flight angle θ2 of the flight 51a of the conveying section 52, as shown in FIG.

[0032] In addition, the second portion 53b of the kneading section 53 is preferably formed so that the depth of the groove in the portion on the +Y-axis side of the second portion 53b becomes shallower toward the partition portion 54 on the -Y-axis side, and the third portion 53c of the kneading section 53 is preferably formed so that the depth of the groove in the portion on the +Y-axis side of the third portion 53c becomes shallower toward the partition portion 54 on the +Y-axis side.

[0033] 1 and 2, the partition section 6 is disposed between the inner peripheral surface of the first portion 23 of the cylinder 2 and the outer peripheral ends of the kneading section 53 and partition wall section 54 of the screw 5. Fig. 5 is a perspective view showing the partition section in the extrusion device of the present embodiment.

[0034] 5, the partition section 6 has a substantially cylindrical shape and is formed with a plurality of through-holes 61. The outer diameter of the partition section 6 is substantially equal to the diameter of the partition section 22 of the cylinder 2, and the inner diameter of the partition section 6 is substantially equal to the diameters of the kneading section 53 and the partition section 54 of the screw 5.

[0035] 5, the through-holes 61 are circular holes that penetrate the partition 6 in the thickness direction of the partition 6. A plurality of the through-holes 61 are formed in each of a plurality of regions of the partition 6 that are spaced apart in the Y-axis direction. For example, the through-holes 61 are formed in the first region A1, the second region A2, the third region A3, and the fourth region A4 of the partition 6.

[0036] 2, the first region A1 is a region that covers a portion of the first portion 53a of the kneading section 53 of the screw 5 that is covered by the portion on the +Y-axis side of the cavity portion 21 on the +Y-axis side of the cylinder 2. The second region A2 is a region that covers a portion of the third portion 53c of the kneading section 53 of the screw 5 that is covered by the portion on the -Y-axis side of the cavity portion 21 on the +Y-axis side of the cylinder 2.

[0037] 2, the third region A3 is a region that covers a portion of the third portion 53c of the kneading section 53 of the screw 5 that is covered by the portion on the +Y-axis side of the cavity portion 21 on the -Y-axis side of the cylinder 2. The fourth region A4 is a region that covers a portion of the second portion 53b of the kneading section 53 of the screw 5 that is covered by the portion on the -Y-axis side of the cavity portion 21 on the -Y-axis side of the cylinder 2.

[0038] 5, for example, no through-holes 61 are formed in the regions of the partitioning section 6 corresponding to the partition wall 54 of the screw 5, i.e., the region between the first region A1 and the second region A2, and the region between the third region A3 and the fourth region A4. Also, no through-holes 61 are formed in the regions of the partitioning section 6 corresponding to the partition wall 22 of the cylinder 2, i.e., the region between the second region A2 and the third region A3.

[0039] The ratio (width) of the penetrating portion 61 per unit area in the first region A1, the second region A2, the third region A3 and the fourth region A4 can be set taking into consideration the elongation effect to be imparted to the resin raw material and the fluidity of the resin raw material, etc.

[0040] Here, in order to enable the partition portion 6 to be inserted into the first portion 23 of the cylinder 2 from the Y-axis direction, the cylinder 2 may be provided with removable ring-shaped lid portions 26 at the end portion on the +Y-axis side and the -Y-axis side of the cylinder 2, as shown in Figures 2 and 3.

[0041] In this case, as shown in Figure 3, it is preferable to form the Y-axis + side end of the Y-axis + side cavity portion 21 of the cylinder 2 at the Y-axis + side end around the through-portion of the Y-axis + side lid portion 26 (i.e., the Y-axis + side side wall portion of the Y-axis + side cavity portion 21).

[0042] Also, as shown in Figure 3, it is preferable to form the Y-axis - side end of the Y-axis - side cavity portion 21 of the cylinder 2 at the Y-axis - side end around the through-portion of the Y-axis - side lid portion 26 (i.e., the Y-axis - side side wall portion of the Y-axis - side cavity portion 21).

[0043] Furthermore, the partition 6 may be fixed to the cylinder 2. For example, a convex engaging portion 62 protruding in the Y-axis direction of the partition 6 may be engaged with a concave engaged portion 26a formed on the lid 26 of the cylinder 2, thereby restricting rotation around the Y-axis.

[0044] The drive unit 7 drives the screw 5 to rotate. As shown in FIG. 1, the drive unit 7 is connected to the end of the screw 5 on the negative Y-axis side so as to be able to transmit a driving force. The heating unit 8 heats the resin raw material supplied to the inside of the cylinder 2 to melt the resin raw material. The heating unit 8 can be configured, for example, by a sheet heater, and is wound around the outer circumferential surface of the cylinder 2.

[0045] Next, the flow of the resin raw material when a composite material is produced using the extrusion apparatus 1 of this embodiment will be described. Figure 6 is a diagram for explaining the flow of the resin raw material in the Y-axis + side portion of the cylinder in the extrusion apparatus of this embodiment. In Figure 6, the flow of the resin raw material is indicated by arrows.

[0046] First, the resin raw material supplied from the hopper 3 to the cylinder 2 is plasticized while being conveyed to the + side of the Y axis by the conveying section 52 of the screw 5, and is heated by the heating section 8 to be melted.

[0047] When the molten resin is pushed by the following molten resin and enters the gap between the second portion 53b of the kneading portion 53 of the screw 5 and the partition portion 6 (i.e., the groove portion of the second portion 53b of the kneading portion 53 of the screw 5) and reaches the vicinity of the partition portion 54 on the negative Y-axis side of the screw 5, the flow of the molten resin toward the positive Y-axis side is blocked by the partition portion 54 on the negative Y-axis side of the screw 5, and the speed of the molten resin is reduced. At this time, the gap between the second portion 53b of the kneading portion 53 of the screw 5 and the partition portion 6 forms a flow path (first flow path) through which the molten resin passes.

[0048] The molten resin is pushed by the following molten resin and passes through the through-hole 61 formed in the fourth region A4 of the partition 6 due to the rotation of the kneading section 53 of the screw 5, and enters the cavity 21 on the negative Y-axis side of the cylinder 2. As a result, the molten resin experiences a sudden reduction in the cross-sectional area of ​​the flow path when it flows into the through-hole 61 of the partition 6, causing it to rapidly accelerate. Furthermore, the molten resin experiences a sudden expansion in the cross-sectional area of ​​the flow path when it flows out of the through-hole 61 of the partition 6, causing it to rapidly decelerate. As a result, an elongation effect is imparted to the molten resin.

[0049] At this time, the partition wall portion 54 on the Y-axis - side of the screw 5 functions as a guide portion (first guide portion) that guides the molten resin from the gap between the second part 53b of the kneading portion 53 of the screw 5 and the partition portion 6 to the through portion 61 formed in the fourth region A4 of the partition portion 6.

[0050] In addition, the through portion 61 formed in the fourth region A4 of the partition portion 6 functions as an outflow hole that allows the molten resin to flow out from the gap between the second part 53b of the kneading portion 53 of the screw 5 and the partition portion 6 into the cavity portion 21 on the Y-axis - side of the cylinder 2.

[0051] Here, the groove portion of the second part 53b of the kneading section 53 of the screw 5 is formed so that it becomes shallower as it approaches the partition wall portion 54 on the Y-axis - side, so that the molten resin can be smoothly guided to the through portion 61 formed in the fourth area A4 of the partition portion 6.

[0052] When the molten resin is pushed by the following molten resin and flows through cavity portion 21 on the negative Y-axis side of cylinder 2 toward the positive Y-axis side, the flow of the molten resin toward the positive Y-axis side is blocked by partition wall 22 of cylinder 2, and the molten resin is decelerated. At this time, cavity portion 21 on the negative Y-axis side of cylinder 2, which is the gap between cylinder 2 and partition portion 6, forms a flow path (second flow path) through which the molten resin passes.

[0053] Here, when the flight angle θ1 of the flight 51b of the kneading section 53 of the screw 5 is smaller than the flight angle θ2 of the flight 51a of the conveying section 52 of the screw 5, the conveying force toward the Y-axis + side in the kneading section 53 is weakened compared to the conveying section 52 of the screw 5, while promoting the flow of the molten resin toward the X-axis + side and the Z-axis + side.

[0054] Therefore, the molten resin is pressurized and can be strongly pushed into the cavity portion 21 of the cylinder 2. This makes it possible to prevent the molten resin from clogging the through portion 61 of the partition portion 6 and the cavity portion 21 of the cylinder 2.

[0055] The molten resin is pushed by the following molten resin, passes through the through-hole 61 formed in the third region A3 of the partitioning section 6, and enters the gap between the Y-axis minus side portion of the third portion 53c of the kneading section 53 of the screw 5 and the partitioning section 6 (i.e., the groove portion of the third portion 53c of the kneading section 53 of the screw 5). As a result, the flow path cross-sectional area of ​​the molten resin suddenly decreases when it flows into the through-hole 61 of the partitioning section 6, causing it to rapidly accelerate. Furthermore, the flow path cross-sectional area of ​​the molten resin suddenly increases when it flows out of the through-hole 61 of the partitioning section 6, causing it to rapidly decelerate. As a result, an elongation effect is imparted to the molten resin.

[0056] At this time, the partition portion 22 of the cylinder 2 functions as a guide portion (second guide portion) that guides the molten resin from the cavity portion 21 on the Y-axis - side of the cylinder 2 to the through portion 61 formed in the third region A3 of the partition portion 6.

[0057] In addition, the through portion 61 formed in the third region A3 of the partition portion 6 functions as an inlet hole that allows molten resin to flow from the cavity portion 21 on the Y-axis - side of the cylinder 2 into the gap between the third part 53c of the kneading portion 53 of the screw 5 and the partition portion 6.

[0058] The molten resin is kneaded while being transported toward the + side of the Y axis by the third portion 53c of the kneading portion 53 of the screw 5. This applies a shearing action to the molten resin. At this time, the gap between the third portion 53c of the kneading portion 53 of the screw 5 and the partition portion 6 forms a flow path (first flow path) through which the molten resin passes.

[0059] When the molten resin is pushed by the following molten resin and flows toward the +Y-axis side, the flow of the molten resin toward the +Y-axis side is blocked by the partition wall 54 on the +Y-axis side of the screw 5, causing the molten resin to slow down. Then, the molten resin is pushed by the following molten resin and passes through the through-hole 61 formed in the second region A2 of the partition 6, and enters the cavity 21 on the +Y-axis side of the cylinder 2. As a result, the flow path cross-sectional area of ​​the molten resin suddenly decreases when it flows into the through-hole 61 of the partition 6, causing a sudden acceleration. Furthermore, the flow path cross-sectional area of ​​the molten resin suddenly increases when it flows out of the through-hole 61 of the partition 6, causing a sudden deceleration. As a result, an elongation effect is imparted to the molten resin.

[0060] At this time, the partition wall portion 54 on the Y-axis + side of the screw 5 functions as a guide portion (first guide portion) that guides the molten resin from the gap between the third part 53c of the kneading portion 53 of the screw 5 and the partition portion 6 to the through portion 61 formed in the second region A2 of the partition portion 6.

[0061] In addition, the through portion 61 formed in the second region A2 of the partition portion 6 functions as an outflow hole that allows the molten resin to flow out from the gap between the third part 53c of the kneading portion 53 of the screw 5 and the partition portion 6 to the cavity portion 21 on the Y-axis + side of the cylinder 2.

[0062] Here, the third portion 53c of the kneading section 53 of the screw 5 is formed so that the groove portion of the third portion 53c becomes shallower as it approaches the partition portion 54 on the + side of the Y axis, so that the molten resin can be efficiently guided to the through portion 61 formed in the second region A2 of the partition portion 6.

[0063] When the molten resin is pushed by the following molten resin and flows toward the Y-axis + side through the cavity portion 21 on the Y-axis + side of the cylinder 2, the flow of the molten resin toward the Y-axis + side is blocked by the Y-axis + side end of the cavity portion 21 on the Y-axis + side of the cylinder 2, and the molten resin slows down.

[0064] At this time, the cavity 21 on the +Y-axis side of the cylinder 2, which is the gap between the cylinder 2 and the partition 6, forms a flow path (second flow path) through which the molten resin passes. Therefore, in this embodiment, the second flow path is divided by the partition wall 22 of the cylinder 2.

[0065] The molten resin is pushed by the following molten resin, passes through the through-holes 61 formed in the first region A1 of the partitioning section 6, and enters the gap between the first portion 53a of the kneading section 53 of the screw 5 and the partitioning section 6 (i.e., the groove portion of the first portion 53a of the kneading section 53 of the screw 5). As a result, the flow path cross-sectional area of ​​the molten resin suddenly decreases when it flows into the through-holes 61 of the partitioning section 6, causing it to rapidly accelerate. Furthermore, the flow path cross-sectional area of ​​the molten resin suddenly increases when it flows out of the through-holes 61 of the partitioning section 6, causing it to rapidly decelerate. As a result, an elongation effect is imparted to the molten resin.

[0066] At this time, the end portion of the cavity portion 21 on the Y-axis + side of the cylinder 2 functions as a guide portion (second guide portion) that guides the molten resin from the cavity portion 21 on the Y-axis + side of the cylinder 2 to the through portion 61 formed in the first region A1 of the partition portion 6.

[0067] In addition, the through portion 61 formed in the first region A1 of the partition portion 6 functions as an inlet hole that allows molten resin to flow from the cavity portion 21 on the Y-axis + side of the cylinder 2 into the gap between the first part 53a of the kneading portion 53 of the screw 5 and the partition portion 6.

[0068] The molten resin is then transported toward the + side of the Y axis by the first portion 53a of the kneading section 53 of the screw 5, and is discharged as a composite material from the discharge port 41 of the discharge section 4. At this time, the gap between the first portion 53a of the kneading section 53 of the screw 5 and the partition section 6 forms a flow path (first flow path) through which the molten resin passes. Therefore, in this embodiment, the first flow path is divided by the partition wall section 54 of the screw 5.

[0069] In this way, the extrusion device 1 and the method for manufacturing a composite material of this embodiment allow the resin raw material to flow between the first flow path and the second flow path through the through-hole 61 of the partition section 6, thereby imparting not only a shearing effect but also an elongation effect to the resin raw material.

[0070] In this case, the second flow path is formed between the cylinder 2 and the partition 6, and a larger space can be secured compared to the flow paths of Patent Documents 1 and 2, thereby making it possible to prevent clogging of the resin raw material in the second flow path. Therefore, the extrusion device 1 and the method for producing a composite material of the present embodiment can impart an elongation effect to the resin raw material while preventing clogging of the resin raw material.

[0071] Furthermore, the extrusion device 1 and the method for manufacturing a composite material of this embodiment can make the end of the cavity portion 21 of the cylinder 2 and the partition portion 54 of the screw 5 function as guide portions for the resin raw material, so that the resin raw material can be efficiently guided to the through portion 61 of the partition portion 6.

[0072] In particular, when the second portion 53b and the third portion 53c of the kneading portion 53 of the screw 5 are formed so that the depth of the grooves in the second portion 53b and the third portion 53c becomes shallower toward the + side of the Y axis, the resin raw material can be well guided to the through portion 61 of the partition portion 6. Therefore, clogging of the resin raw material in the through portion 61 of the partition portion 6 can be suppressed.

[0073] Furthermore, when the flight angle θ1 of the flight 51b of the kneading section 53 of the screw 5 is smaller than the flight angle θ2 of the flight 51a of the conveying section 52 of the screw 5, the force of conveying the resin material toward the +Y-axis side in the kneading section 53 is weakened compared to the conveying section 52 of the screw 5, while promoting the flow of the resin material toward the +X-axis side and the +Z-axis side. As a result, the resin material is pressurized and can be strongly pushed into the cavity section 21 of the cylinder 2. This makes it possible to prevent the molten resin from clogging the through-hole 61 of the partition section 6 or the second flow path.

[0074] Next, we will explain the results of a comparison between the dispersion test results of a composite material obtained by kneading resin raw materials using a general twin-screw extrusion device and the dispersion test results of a composite material obtained by kneading resin raw materials using the extrusion device 1 of this embodiment.

[0075] Fig. 7 shows the results of a dispersion test of a composite material obtained by kneading resin raw materials using a general twin-screw extrusion device. Fig. 8 is an enlarged view of part VIII in Fig. 7. Fig. 9 shows the results of a dispersion test of a composite material obtained by kneading resin raw materials using the extrusion device of this embodiment. Fig. 10 is an enlarged view of part X in Fig. 9.

[0076] Here, in a typical twin-screw extrusion device, a screw with a barrel diameter of 32 mm was rotated at 500 rpm, and dispersion test results were obtained for a composite material obtained by kneading polypropylene (80%) and ethylene-vinyl alcohol resin (20%).

[0077] In addition, in the extrusion device 1 of this embodiment, the screw 5 with a barrel diameter of 35 mm was rotated at 1300 rpm, and dispersion test results were obtained for a composite material obtained by kneading polypropylene (80%) and ethylene-vinyl alcohol resin (20%).

[0078] As shown in Figures 7 and 8, in the composite material obtained by kneading the resin raw materials using a general twin-screw extrusion device, the average dispersed diameter of the ethylene-vinyl alcohol resin was 9.53 μm, whereas, as shown in Figures 9 and 10, in the composite material obtained by kneading the resin raw materials using the extrusion device 1 of this embodiment, the average dispersed diameter of the ethylene-vinyl alcohol resin was 2.73 μm.

[0079] This shows that the extrusion apparatus 1 of this embodiment can demonstrate higher kneading performance than a general twin-screw extrusion apparatus. In particular, it is difficult to finely knead the above-mentioned resin raw materials unless they are given an elongation effect, but the extrusion apparatus 1 of this embodiment can achieve finer kneading than a general twin-screw extrusion apparatus, and therefore can effectively impart an elongation effect to the composite material.

[0080] Next, we will explain the results of a comparison between the mechanical strength of a test piece molded from a composite material obtained by kneading resin raw materials using a general twin-screw extrusion device and the mechanical strength of a test piece molded from a composite material obtained by kneading resin raw materials using the extrusion device 1 of this embodiment.

[0081] Fig. 11 is a graph showing the tensile modulus of a test piece molded from a composite material obtained by kneading a resin raw material using a general twin-screw extrusion apparatus and a test piece molded from a resin raw material kneaded using the extrusion apparatus of this embodiment. Fig. 12 is a graph showing the flexural modulus of a test piece molded from a resin raw material kneaded using a general twin-screw extrusion apparatus and a test piece molded from a resin raw material kneaded using the extrusion apparatus of this embodiment.

[0082] In a typical twin-screw extrusion device, a screw with a barrel diameter of 32 mm was rotated at 500 rpm, and the length of the glass fiber in the composite material obtained by kneading polypropylene (70%) and glass fiber (30%) as resin raw materials was measured, as well as the tensile modulus and flexural modulus of the test piece molded from the composite material.

[0083] In addition, in the extrusion device 1 of this embodiment, the screw 5 with a barrel diameter of 35 mm was rotated at 1300 rpm, and the length of the glass fiber of the composite material obtained by kneading polypropylene (70%) and glass fiber (30%) as resin raw materials, and the tensile modulus and flexural modulus of the test piece molded from the composite material were obtained.

[0084] The average fiber length of the glass fibers in the composite material obtained by kneading using a general twin-screw extruder was 0.51 mm, and the standard deviation of the fiber lengths of the glass fibers in the composite material was 0.34 mm.

[0085] On the other hand, the average fiber length of the glass fibers in the composite material obtained by kneading using the extrusion device of this embodiment was 0.36 mm, and the standard deviation of the fiber lengths of the glass fibers in the composite material was 0.24 mm.

[0086] As shown in FIG. 11, the tensile modulus of the test piece of the composite material obtained using the extrusion apparatus 1 of this embodiment is lower than the tensile modulus of the test piece of the composite material obtained using a general twin-screw extrusion apparatus, but the reduction in the tensile modulus was only 11%.

[0087] On the other hand, as shown in FIG. 12, the flexural modulus of the test piece of the composite material obtained using the extrusion apparatus 1 of this embodiment was 5% higher than that of the test piece of the composite material obtained using a general twin-screw extrusion apparatus, even though the glass fiber length of the composite material obtained using the extrusion apparatus 1 was shorter than that of the composite material obtained using a general twin-screw extrusion apparatus.

[0088] Based on these results, the relationship between the flexural modulus of a test piece of a composite material obtained using the extrusion apparatus 1 of this embodiment and the flexural modulus of a test piece of a composite material obtained using a general twin-screw extrusion apparatus is reversed to the relationship between the length of the glass fibers in the composite material obtained using the extrusion apparatus 1 and the length of the glass fibers in the composite material obtained using a general twin-screw extrusion apparatus, but it appears that the high dispersion of the glass fibers themselves rather than the fiber length of the glass fibers in the composite material contributes to the improvement in flexural strength. In other words, even if the glass fibers are broken and shortened by kneading, an improvement in mechanical strength can be expected as long as the glass fibers can be finely dispersed in the resin raw material, and it can be seen that this improvement in mechanical strength can be achieved when the extrusion apparatus 1 of this embodiment is used.

[0089] This means that, for example, when using the extrusion device 1 of this embodiment to re-obtain a composite material from resin pieces in which the glass fibers have been shortened when a resin product is crushed for recycling, a recycled product with high mechanical strength can be obtained.

[0090] The present disclosure is not limited to the above-described embodiments, and can be modified as appropriate within the scope of the present disclosure.

[0091] Although the extrusion device 1 in the above embodiment is configured as a single-screw extrusion device, it may be configured as an extrusion device having a plurality of screws.

[0092] Although the extrusion device 1 of the above embodiment has two cavities 21, it may have one or three or more cavities. In this case, the number of cavities 21 can be determined taking into consideration the elongation effect to be imparted to the resin raw material and deformation of the resin raw material due to a rise in temperature as the resin raw material moves back and forth between the first flow path and the second flow path. Furthermore, the arrangement of the partition walls of the cylinder 2 and the screw 5 and the arrangement of the through-holes 61 of the partition 6 can be changed as appropriate depending on the number of cavities 21.

[0093] In the above embodiment, the cavity 21 is formed on the inner peripheral surface of the cylinder 2, but for example, the inner diameter of the cylinder 2 may be made substantially equal and a recess may be formed on the outer peripheral surface of the partition 6, thereby forming a cavity between the cylinder 2 and the partition 6. Furthermore, the cavity is not limited to a substantially cylindrical shape, and may be a groove extending in the Y-axis direction, for example.

[0094] In the above embodiment, a cylindrical partition 6 is used, but the shape of the partition 6 may be any shape that can separate the first flow path and the second flow path, and can be changed appropriately depending on, for example, the shape of the cavity. Furthermore, the through-hole 61 of the partition 6 is not limited to a circle, and may be a polygon, an ellipse, or the like. [Explanation of symbols]

[0095] 1. Extrusion equipment 2 cylinder, 23 first part, 24 second part, 25 third part 21 Cavity 22 Bulkhead section 26 Lid part, 26a Engaged part 3 Hopper 4 Discharge part 41 Discharge port 5 screws 51 Flight, 51a Flight in the conveying section, 51b Flight in the kneading section 52 Conveyor 53 kneading section, 53a first section, 53b second section, 53c third section 54 Bulkhead θ1 Flight angle of the flight in the kneading section of the screw θ2 Flight angle of the flight of the screw transport section 6 Partition, A1 First area, A2 Second area, A3 Third area, A4 Fourth area 61 Penetration 62 Engagement part 7 Drive unit 8 Heating section

Claims

1. a cylinder to which resin raw material is supplied from a hopper; a discharge portion provided at an end of the cylinder and configured to discharge the kneaded resin raw material; a screw that is rotatably inserted inside the cylinder and kneads the resin raw material while transporting it to the discharge portion; a partition portion disposed between the cylinder and the screw and having a through-hole formed therein through which the resin raw material passes; a first flow path formed between the screw and the partition portion, through which the resin raw material passes; a second flow path formed between the cylinder and the partition portion, through which the resin raw material passes; Equipped with The partition portion has a cylindrical shape that covers the screw and is provided with a plurality of holes as the through-portions.

2. The extrusion device according to claim 1 , further comprising a first guide portion that guides the resin raw material from the first flow path to the through-hole in the partition portion.

3. The extrusion device according to claim 1 or 2, further comprising a second guide portion that guides the resin raw material from the second flow path to the through-hole in the partition portion.

4. The screw includes a conveying section that conveys the resin raw material, and a kneading section that is arranged on the discharge section side with respect to the conveying section and kneads the resin raw material, The extrusion device according to claim 1 , wherein the partition section is disposed at a position corresponding to a kneading section of the screw.

5. The extrusion device according to claim 4 , wherein a flight angle of the kneading section of the screw is smaller than a flight angle of the conveying section of the screw.

6. The extrusion device according to claim 1 , wherein the partition is fixed to the cylinder.

7. 7. The extrusion device according to claim 1, wherein the through-hole of the partition portion comprises a plurality of outlet holes for allowing the resin raw material to flow from the first flow path to the second flow path, and a plurality of inlet holes for allowing the resin raw material to flow from the second flow path to the first flow path.

8. a first partition wall portion that divides the first flow path between the outlet hole and the inlet hole that is arranged on the discharge portion side with respect to the outlet hole in the axial direction of the screw, 8. The extrusion device of claim 7, wherein the first flow path is disposed across the second flow path.

9. the screw includes a conveying section that conveys the resin raw material, a kneading section that is arranged on the discharge section side with respect to the conveying section and kneads the resin raw material, and the first partition wall section, The extrusion device according to claim 8 , wherein the depth of the grooves in the portion of the kneading section on the side of the first partition wall section becomes shallower toward the side of the first partition wall section.

10. a second partition wall portion that divides the second flow path between the inlet hole and the outlet hole that is disposed on the discharge portion side with respect to the inlet hole in the axial direction of the cylinder, 10. The extrusion device of claim 7, wherein the second flow path is disposed across the first flow path.

11. The extrusion device according to claim 1 , wherein the second flow path is a recess formed in an inner circumferential surface of the cylinder.

12. a cylinder to which resin raw material is supplied from a hopper; a discharge portion provided at an end of the cylinder and configured to discharge the kneaded resin raw material; a screw that is rotatably inserted inside the cylinder and kneads the resin raw material while transporting it to the discharge portion; a partition portion disposed between the cylinder and the screw and having a through-hole formed therein through which the resin raw material passes; a first flow path formed between the screw and the partition portion, through which the resin raw material passes; a second flow path formed between the cylinder and the partition portion, through which the resin raw material passes; Equipped with The screw has a conveying section that conveys the resin raw material, and a kneading section that is arranged on the discharge section side with respect to the conveying section and kneads the resin raw material, The partition section is disposed at a position corresponding to the kneading section of the screw, An extrusion device, wherein a flight angle of the kneading section of the screw is smaller than a flight angle of the conveying section of the screw.

13. a step of conveying the resin raw material supplied inside the cylinder to the side of the discharge portion by a screw; a step of causing the resin raw material to flow in a first flow path formed between the screw and the partition portion through a through-hole in the partition portion disposed between the cylinder and the screw; a step of causing the resin raw material to enter a second flow path formed between the cylinder and the partition part by a recess formed on an inner peripheral surface of the cylinder through the through-hole of the partition part and flow in the second flow path; Equipped with The method for producing a resin composition includes accelerating the resin raw material when the resin raw material passes through the through-hole in the partition.

Images