Screw machine

Abstract

Even when the bulk density of the second material is low, the second material is supplied stably from the second supply port. [Solution] The extruder 100 is rotationally driven around an axis by a first motor 50 and includes a screw 10 that attaches a second material to a first material supplied at the base end and conveys it to the tip end, and a barrel 20 into which a cylinder 21 into which the screw 10 is inserted is formed. The barrel 20 has a first supply hole 22 for supplying the first material into the cylinder 21 at the base end, a side feed hole 24 provided at a position spaced apart from the first supply hole 22 toward the tip end for supplying the second material, and a discharge port 23 for discharging the first material and the second material from the cylinder 21 to the outside of the barrel 20. The screw 10 has a kneading and conveying section 14 provided at a position that includes the range into which the second material is supplied from the side feed hole 24 and conveys the first material while kneading it and attaching it to the second material.

Description

Technical Field

[0001] The present invention relates to a screw machine.

Background Art

[0002] Patent Document 1 discloses a twin-screw extruder (screw machine) that includes a material supply unit, a melt-kneading unit, and a discharge unit, and manufactures pellets from the supplied materials. In this twin-screw extruder, a thermoplastic resin (first material) is supplied from a main supply unit (first supply hole) arranged on the most upstream side, and an inorganic filler (second material) is supplied from a side port (second supply hole) arranged at an arbitrary position between the upstream and the downstream.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when the bulk specific gravity of the second material supplied from the second supply hole is low, there is a risk that the second material cannot be stably supplied without adhering to the first material supplied from the first supply hole.

[0005] The present invention has been made in view of the above problems, and an object thereof is to stably supply the second material from the second supply hole even when the bulk specific gravity of the second material is low.

Means for Solving the Problems

[0006] According to one aspect of the present invention, a screw machine comprises a screw that is rotationally driven around an axis by a drive source and conveys a second material to a first material supplied at the base end and attaches it to the tip end, and a barrel into which a cylinder into which the screw is inserted is formed, wherein the barrel has a first supply hole for supplying the first material into the cylinder at the base end, a second supply hole provided at a position spaced apart from the first supply hole toward the tip end and for supplying the second material, and a discharge port for discharging the first material and the second material from the cylinder to the outside of the barrel, and the screw has a kneading and conveying section provided at a position including the range into which the second material is supplied from the second supply hole and conveys the first material while kneading it and attaching it to the second material. [Effects of the Invention]

[0007] In this embodiment, a kneading and conveying unit that attaches the second material to the first material and conveys it while kneading is provided at a position that includes the area from which the second material is supplied from the second supply hole. The second material supplied from the second supply hole is supplied to the area where the first material is being kneaded in the kneading and conveying unit, so that the second material can be easily attached to the first material. In addition, since the kneading and conveying unit conveys the first material and the second material attached to the first material in the conveying direction while kneading them, it is possible to prevent delays in the supply of the second material. Therefore, by providing a kneading and conveying unit, the second material can be stably supplied from the second supply hole even when the bulk density of the second material is low. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a front view of a screw machine according to an embodiment of the present invention, and is a schematic diagram showing the barrel in cross-section. [Figure 2] Figure 2 is a cross-sectional view taken along line II-II in Figure 1, and is a schematic diagram illustrating the second supply section. [Figure 3] Figure 3 is a conceptual diagram of the mixing and transferring section in a screw machine. [Figure 4] Figure 4 shows the screw element of the kneading and transfer section as viewed from the axial direction. [Figure 5] Figure 5 illustrates the relationship between the torsional angle of adjacent disks in a screw element and the evaluation of the supply state of the second material. [Modes for carrying out the invention]

[0009] Hereinafter, an extruder 100 as a screw machine according to an embodiment of the present invention will be described with reference to the drawings. Note that, for the sake of explanation, the scale of each component in each drawing has been appropriately changed and is not necessarily strictly illustrated.

[0010] First, the overall configuration of the extruder 100 will be described with reference to Figures 1 and 2. Figure 1 is a front view of the extruder 100, a schematic diagram showing the barrel 20 in cross-section. Figure 2 is a cross-sectional view taken along line II-II in Figure 1, a schematic diagram illustrating the side feed device 40 as the second feeding unit.

[0011] As shown in Figures 1 and 2, the extruder 100 comprises a pair of screws 10a and 10b, a barrel 20, a main feed device 30 as a first feed unit, a side feed device 40 (see Figure 2), a first motor 50 as a drive source, and a controller 60. The extruder 100 is a so-called twin-screw compounding extruder equipped with a pair of screws 10a and 10b. However, the extruder 100 is not limited to a twin-screw compounding extruder; for example, it may be a single-screw or multi-screw extruder with three or more screws.

[0012] The extruder 100 is an extruder that kneads granular or powdery material (first material and second material) supplied into the cylinder 21 of the barrel 20 while conveying it with screws 10a and 10b, and then extrudes the kneaded material from the discharge port 23 of the barrel 20 to form a shape.

[0013] The bulk density of the second material is 0.2 or less. Bulk density is the specific gravity obtained by dividing the weight of a granular or powdery material by the volume including the air gaps between the materials. In other words, bulk density is the apparent specific gravity of materials that have air gaps between them, such as granular or powdery materials. A material with a bulk density of 0.2 or less has a weight of 20 g or less per 100 cc and is a very fine powder containing air. The second material has a lower bulk density than the first material. In the following, when the first and second materials are not distinguished, they will be collectively referred to as "material". Also, the direction in which the rotation shafts of screws 10a and 10b extend, that is, the direction in which the material is conveyed, will be referred to as the "conveying direction" or "axial direction".

[0014] The barrel 20 has a cylinder 21 into which a pair of screws 10a and 10b are inserted. The barrel 20 is formed by connecting a plurality of barrel units 20a along one direction. The barrel 20 is a cylindrical member formed to extend in one direction, with a pair of through holes 21a and 21b (see Figure 2) formed along its longitudinal direction (axial direction). The pair of through holes 21a and 21b are in communication with each other, and the cylinder 21 is formed by the pair of through holes 21a and 21b.

[0015] The main supply device 30 includes a first supply hole 22 and a first hopper 32.

[0016] The first supply hole 22 is formed in the barrel unit 20a at one end of the barrel 20 in the longitudinal direction. The first supply hole 22 is formed opening into the cylinder 21. The first supply hole 22 is a hole for supplying the first material into the cylinder 21 at the base end. The first material is supplied from a feeder (not shown) to the first supply hole 22 through the first hopper 32.

[0017] At the other longitudinal end of the barrel unit 20a at the longitudinal other end of the barrel 20, a discharge port 23 for discharging the kneaded material generated by the melted and kneaded material is formed by opening into the cylinder 21. Hereinafter, in the cylinder 21, the side of the first supply hole 22 (the right side in FIG. 1) is also referred to as the "upstream" or "base end side" of the cylinder 21, and the side of the discharge port 23 (the left side in FIG. 1) is also referred to as the "downstream" or "tip side" of the cylinder 21. The material supplied into the cylinder 21 through the first supply hole 22 is conveyed downstream by the screws 10a and 10b and discharged outside the barrel 20 through the discharge port 23.

[0018] The barrel 20 is formed with a side feed hole 24 as a second supply hole for supplying a second material into the cylinder 21 from the side feed device 40, and a plurality of vent holes (not shown) for discharging and removing the gas in the cylinder 21 to the outside of the cylinder 21.

[0019] The side feed hole 24 is provided at a position spaced from the tip side of the first supply hole 22.

[0020] The barrel 20 is further provided with a heating device (not shown) for heating the barrel 20, a cooling device (not shown) for cooling the barrel 20, a temperature sensor (not shown) for detecting the temperature of the barrel 20, and the like.

[0021] As shown in FIG. 2, the pair of screws  10a and 10b have the same shape as each other and are provided so as to extend in parallel, and are inserted into the cylinder 21 of the barrel 20 in a meshed state with each other. The pair of screws 10a and   10b are rotated in the same direction around their respective central axes (axes) by the first motor 50 (see FIG. 1) via the speed reduction unit 55. That is, the pair of screws 10a and 10b are rotated synchronously with each other. Hereinafter, the pair of screws 10a and 10b are collectively referred to simply as "screw 10", and the specific configuration will be described.

[0022] As shown in Figure 1, the screw 10 is a shaft member provided along the longitudinal direction of the barrel 20, extending from its base end, which is connected to the first motor 50, to its tip. The base end of the screw 10 is located upstream of the cylinder 21, and the tip of the screw 10 is located downstream of the cylinder 21. The screw 10 is rotationally driven around its axis by the first motor 50, and it attaches the second material to the first material supplied at the base end and conveys it to the tip end.

[0023] The screw 10 has a first transfer section 11a, a second transfer section 11b, and a third transfer section 11c that transfer the material in the cylinder 21 downstream, a first kneading section 13 that kneads the material in the cylinder 21, a kneading transfer section 14 that kneads and transfers the material in the cylinder 21, and an end section 15 that protrudes to the outside of the barrel 20. In this embodiment, the first transfer section 11a, the first kneading section 13, the second transfer section 11b, the kneading transfer section 14, and the third transfer section 11c are arranged in that order from upstream to downstream of the cylinder 21. In the following, when the first transfer section 11a, the second transfer section 11b, and the third transfer section 11c are not distinguished, they will be collectively referred to as "transfer section 11".

[0024] The transfer section 11 has spiral flights 12 (screw blades) on its outer circumference. The first material supplied to the cylinder 21 from the first supply hole 22 is transferred downstream toward the first kneading section 13 by the first transfer section 11a of the rotating screw 10. In other words, the first supply hole 22 is formed in the barrel 20 so as to face the first transfer section 11a.

[0025] The second transfer unit 11b is located between the first kneading unit 13 and the kneading transfer unit 14, and transports the first material, which has been kneaded and melted by the first kneading unit 13, toward the kneading transfer unit 14.

[0026] The third transfer unit 11c transports the material, which has been mixed and melted by the kneading transfer unit 14 with the second material attached to it, toward the discharge port 23.

[0027] The first kneading section 13 is composed of a plurality of discs 13a arranged in the longitudinal direction (the axial direction of the screw 10). The discs 13a are kneading discs with a substantially elliptical shape.

[0028] As disk 13a, a forward-feed disk having a twist in the same direction as the twist of the flight 12 of the transfer unit 11, a reverse-feed disk having a twist in the opposite direction to the twist of the flight 12 of the transfer unit 11, and a neutral disk without twist can be used.

[0029] The forward-feed disc, like the transfer unit 11, transports the material from upstream to downstream of the cylinder 21 (in other words, from the base end to the tip end of the screw 10). The reverse-feed disc transports the material in the opposite direction to the transfer unit 11 and the forward-feed disc. Therefore, the reverse-feed disc functions to brake the material flow that is transported from upstream to downstream. The neutral disc has no twist and therefore only has the ability to knead the material and does not have the ability to transport the material.

[0030] The kneading and transferring section 14 is located relatively downstream of the first kneading section 13 (towards the tip of the screw 10). That is, the kneading and transferring section 14 is located spaced apart from the first kneading section 13 in the axial direction of the screw 10. The kneading and transferring section 14 is located in a position that includes the area into which the second material is fed from the side feed hole 24. The kneading and transferring section 14 conveys the first material while kneading it by adhering the second material to it. The specific configuration of the kneading and transferring section 14 will be described in detail later with reference to Figures 3 to 5.

[0031] Furthermore, a second mixing section (not shown) configured similarly to the first mixing section 13 may be provided downstream of the mixing and transferring section 14 (towards the tip of the screw 10).

[0032] The end 15 of the screw 10 is connected to the first transfer section 11a on the side opposite to the first kneading section 13 in the axial direction of the screw 10. The end 15 passes through the barrel unit 20a at the upstream end of the barrel 20 and is connected to the motor shaft 51 of the first motor 50 via a reduction section 55, which will be described later.

[0033] The first motor 50 rotates a pair of screws 10a and 10b within the cylinder 21. The first motor 50 is an electric motor whose operation is controlled by a controller 60. The motor shaft 51 of the first motor 50 is connected to a reduction unit 55, and the rotation of the motor shaft 51 is transmitted to the pair of screws 10a and 10b via the reduction unit 55. As a result, the pair of screws 10a and 10b are rotationally driven by the first motor 50.

[0034] The reduction gear unit 55 reduces the rotation of the motor shaft 51 of the first motor 50 by a gear mechanism (not shown) composed of multiple gears and transmits it to a pair of screws 10a and 10b. The end 15 of the screw 10 is connected to the reduction gear unit 55. Since a known configuration can be used for the gear mechanism of the reduction gear unit 55, a detailed explanation and illustration are omitted.

[0035] The controller 60 controls the rotational speed of the first motor 50 and the second motor 48, which will be described later. The controller 60 is composed of a microcomputer equipped with a CPU, RAM, ROM, input / output interface, etc. The controller 60 performs various processes by having the CPU read and execute a program stored in the ROM. The controller 60 can also be composed of multiple microcomputers.

[0036] As shown in Figure 2, the side feed device 40 includes a pair of screw members, side screws 45a and 45b, a housing 47 into which a side cylinder 47a into which the side screws 45a and 45b are inserted, a second hopper 47c, and a second motor 48 as a drive source for rotating the pair of side screws 45a and 45b around their axes.

[0037] Although detailed illustrations are omitted, the pair of side screws 45a and 45b have similar shapes, extend parallel to each other, and are aligned in the axial direction of the screw 10. The pair of side screws 45a and 45b are inserted into the side cylinder 47a of the housing 47 in a meshed state. The pair of side screws 45a and 45b are rotated in the same direction around their respective central axes by the second motor 48. In other words, the pair of side screws 45a and 45b rotate synchronously with each other. In the following, the pair of side screws 45a and 45b will be collectively referred to simply as "side screws 45," and their specific configuration will be described.

[0038] As shown in Figure 2, the side screw 45 is a shaft member whose base end is connected to the second motor 48 and whose tip is inserted into the side feed hole 24 of the barrel 20. The side screw 45 is mounted on approximately the same horizontal plane as the screw 10 and approximately perpendicular to the screw 10.

[0039] On the outer circumference of the side screw 45, a spiral-shaped flight 46 (screw blade) is provided, similar to the screw 10.

[0040] The second motor 48 is an electric motor whose operation is controlled by the controller 60. The second motor 48 rotates the side screw 45, which in turn supplies the second material into the cylinder 21 from the side feed hole 24.

[0041] The housing 47 is attached to the barrel 20 by bolts or the like (not shown) so as to cover the side feed holes 24. The housing 47 is in contact (metal-to-metal contact) with the barrel 20, thereby sealing the space between the housing 47 and the barrel 20 to prevent material leakage. Similar to the cylinder 21 of the barrel 20, although not shown, the side cylinder 47a of the housing 47 is composed of through holes into which a pair of side screws 45a and 45b are inserted and communicate with each other.

[0042] With the housing 47 attached to the barrel 20, the side cylinder 47a of the housing 47 communicates with the side feed hole 24. The housing 47 has a side supply hole 47b that communicates with the side cylinder 47a. The second material is supplied from a feeder (not shown) through the second hopper 47c to the side supply hole 47b.

[0043] Next, the kneading and transferring section 14 will be described with reference to Figures 3 to 5. Figure 3 is a conceptual diagram of the kneading and transferring section 14. Figure 4 is a diagram showing the disk element 16 of the kneading and transferring section 14 as viewed from the axial direction. Figure 5 is a diagram illustrating the evaluation of the torsional angle of adjacent disks 16a in the disk element 16 and the supply state of the second material. The shaded areas in Figure 3 indicate the positions of both ends of the major axis of the disk 16a, which is formed in a substantially elliptical shape, that is, the positions of both ends of the disk 16a that are closest to the inner wall of the cylinder 21.

[0044] As shown in Figures 3 and 4, the kneading and transferring section 14, like the first kneading section 13, is composed of a plurality of discs 16a arranged in the longitudinal direction (the axial direction of the screw 10). The discs 16a are kneading discs with a substantially elliptical shape.

[0045] Multiple disks 16a arranged in stacks in the transport direction constitute a disk element 16. Here, the disk element 16 is composed of five disks 16a. It is preferable that the disk element 16 consists of 2 to 10 disks 16a.

[0046] Furthermore, multiple disk elements 16 (two in this case) are arranged in the transport direction. It is preferable that the number of disk elements 16 arranged in the transport direction be two to three.

[0047] Generally, with the disc element 16, the smaller the twist angle α, the better the transportability but the worse the kneading ability, and the larger the twist angle α, the better the kneading ability but the worse the transportability.

[0048] As shown in Figure 5, it was confirmed that when the twist angle α is 10 degrees, the second material supplied from the side feed device 40 is supplied into the cylinder 21 without any problems, and the material can be conveyed in the conveying direction.

[0049] It was confirmed that when the twist angle α is 30 degrees, the second material supplied from the side feed device 40 is supplied into the cylinder 21 without any problems, and the material can be conveyed in the conveying direction.

[0050] However, when the twist angle α falls below 10 degrees, it becomes difficult to transport the material in the transport direction. This is because adjacent disks 16a are almost straight with little twist, significantly reducing the material transport performance. In other words, 10 degrees, the lower limit of the twist angle α, is the limit of the material transport performance in the transport direction.

[0051] On the other hand, when the twist angle α is 45 degrees, it was confirmed that an overflow occurs in which the second material supplied from the side feed device 40 into the cylinder 21 returns to the side feed device 40 without adhering to the first material inside the cylinder 21. In other words, the upper limit of the twist angle α, 30 degrees, is set as the upper limit for the second material supplied from the side feed device 40 to be supplied into the cylinder 21 without any problems.

[0052] Thus, the torsional angle α (see Figure 4) between adjacent disks 16a in the axial direction is preferably 10 to 30 degrees. This ensures that the second material supplied from the side feed device 40 is supplied into the cylinder 21 without interruption, and that the material is transported in the transport direction.

[0053] In the disk element 16, the torsional angle α between adjacent disks 16a in the axial direction is 22.5 degrees. That is, the total torsional angle θ of the disk element 16, which is composed of five disks 16a, is 90 degrees. Also, since there are two disk elements 16, the total torsional angle of the two disk elements 16 (not shown) is 180 degrees.

[0054] The end disks 161 located at the uppermost and lowermost points in the transport direction of the multiple disks 16a have a smaller thickness in the transport direction than the intermediate disks 162 located between the end disks 161. In this case, the end disks 161 are half the thickness of the intermediate disks 162.

[0055] Multiple disk elements 16 are arranged side by side in the transport direction. In this case, two disk elements 16 are arranged side by side in the transport direction.

[0056] The end disks 161 adjacent to other disk elements 16 are set to the same twist angle α. As a result, the end disks 161 of adjacent disk elements 16 overlap and become the same thickness as the intermediate disk 162.

[0057] In this way, when multiple disk elements 16 are arranged in the transport direction, adjacent end disks 161 overlap to form the same thickness as a single intermediate disk 162. Furthermore, when adjacent end disks 161 overlap to form the same thickness as a single intermediate disk 162, the adjacent end disks 161 can be configured to appear as if they are one integrated intermediate disk 162.

[0058] As shown in Figure 3, when the thickness of the disc 16a is L [mm] and its outer diameter is φD [mm], it is desirable that L / D be in the range of 0.2 to 1.25. Furthermore, it is desirable that the outer diameter of the disc element 16 be sized to have a wider gap than a normal kneading disc, such that there is a gap of 0.60 to 1.75% relative to the inner diameter of the cylinder 21.

[0059] Next, the operation of the extruder 100 will be explained.

[0060] When the extruder 100 is operated, the first motor 50 is controlled so that the pair of screws 10 rotate in the same direction at the same speed. In addition, the side screws 45 of the side feed device 40 are rotated by the second motor 48.

[0061] The material supplied into the cylinder 21 through the first supply hole 22 is transported longitudinally downstream by the first transfer section 11a of the screw 10.

[0062] The material transported downstream by the first transfer unit 11a is kneaded by the first kneading unit 13. The material kneaded by the first kneading unit 13 is transported downstream toward the kneading transfer unit 14 by the second transfer unit 11b. At this point, the first material has been kneaded and is completely melted.

[0063] In the mixing and transferring section 14, the second material is supplied after the first material has been mixed and completely melted.

[0064] Typically, a transfer section 11 having a spiral flight 12 is provided in a position that includes the area where the second material is supplied from the side feed hole 24.

[0065] However, the second material is a very fine powder with a bulk density of 0.2 or less. Therefore, when attempting to supply the second material from the side feed device 40 to the transfer unit 11 having spiral flights 12, the second material enters the cylinder 21 while entraining air, and thus the second material does not adhere properly to the molten first material.

[0066] Therefore, in the extruder 100, a kneading and transfer section 14 is provided in a position that includes the area where the second material is supplied from the side feed hole 24. The kneading and transfer section 14 is formed by arranging two disc elements 16, each formed by stacking five kneading discs 16a, in the axial direction.

[0067] Thus, the kneading and transferring unit 14, which adsorbs the second material onto the first material and conveys it while kneading, is positioned in a location that includes the area from which the second material is supplied through the side feed holes 24. Since the second material supplied through the side feed holes 24 is supplied to the area where the first material is being kneaded in the kneading and transferring unit 14, the second material can be easily adsorbed onto the first material. In addition, since the kneading and transferring unit 14 conveys the first material and the second material adsorbed onto the first material in the conveying direction while kneading them together, it is possible to prevent delays in the supply of the second material.

[0068] Therefore, by providing the kneading and transfer section 14, the second material can be stably supplied from the second supply hole even when the bulk density of the second material is low.

[0069] Subsequently, the second material is attached to the first material by the kneading and transfer unit 14, and the melted material is transported toward the discharge port 23 by the third transfer unit 11c, and discharged through the discharge port 23 to be transferred to the next process.

[0070] The effects and advantages of this embodiment will be described below.

[0071] The extruder 100 includes a screw 10 that is rotationally driven around an axis by a first motor 50 and conveys a second material to a first material supplied at the base end and attaches it to the tip end, and a barrel 20 into which a cylinder 21 into which the screw 10 is inserted is formed. The barrel 20 has a first supply hole 22 for supplying the first material into the cylinder 21 at the base end, a side feed hole 24 provided at a position spaced apart from the first supply hole 22 toward the tip end for supplying the second material, and a discharge port 23 for discharging the first material and the second material from the cylinder 21 to the outside of the barrel 20. The screw 10 has a kneading and conveying section 14 provided at a position that includes the range into which the second material is supplied from the side feed hole 24 and conveys the first material while kneading it and attaching it to the second material.

[0072] Furthermore, when the thickness of disk 16a is L and its outer diameter is D, the ratio L / D is in the range of 0.2 to 1.25.

[0073] With these configurations, a kneading and conveying unit 14, which adsorbs the second material onto the first material and conveys it while kneading, is provided in a position that includes the area from which the second material is supplied from the side feed hole 24. The second material supplied from the side feed hole 24 is supplied to the area where the first material is being kneaded in the kneading and conveying unit 14, making it easier for the second material to adhere to the first material. In addition, since the kneading and conveying unit 14 conveys the first material and the second material adhering to the first material in the conveying direction while kneading them together, it is possible to prevent delays in the supply of the second material. Therefore, by providing the kneading and conveying unit 14, the second material can be stably supplied from the second supply hole even when the bulk density of the second material is low.

[0074] This method is particularly suitable when the bulk density of the second material is very low, such as 0.2 or less.

[0075] Furthermore, the kneading and transfer section 14 has a disc element 16 composed of multiple discs 16a arranged in overlapping positions in the transfer direction, and the twist angle between adjacent discs 16a is 10 to 30 degrees.

[0076] In this configuration, the lower limit of the twist angle α, which is 10 degrees, is the limit of the performance for conveying the material in the conveying direction. The upper limit of the twist angle α, which is 30 degrees, is set as the upper limit for the second material supplied from the side feed device 40 to be supplied into the cylinder 21 without interruption. Therefore, the second material supplied from the side feed device 40 is supplied into the cylinder 21 without interruption, and the material can be conveyed in the conveying direction.

[0077] Furthermore, the end discs 161 located at the uppermost and lowermost points in the transport direction among the multiple discs 16a have a smaller thickness in the transport direction than the intermediate discs 162 located between the end discs 161. Specifically, the end discs 161 are half the thickness of the intermediate discs 162.

[0078] With this configuration, when multiple disk elements 16 are arranged in the transport direction, adjacent end disks 161 overlap to become the same thickness as one intermediate disk 162.

[0079] Furthermore, multiple disk elements 16 are arranged in a row in the transport direction, and end disks 161 adjacent to other disk elements 16 are set to the same twist angle α.

[0080] With this configuration, adjacent end disks 161 overlap to become the same thickness as a single intermediate disk 162, making it appear as if the adjacent end disks 161 are integrated to form a single intermediate disk 162.

[0081] Although embodiments of the present invention have been described above, these embodiments only represent a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

[0082] For example, the side feed device 40 is a twin-screw device having a pair of side screws 45a, but like the extruder 100, it may be a single-screw (one-screw) or multi-screw device with three or more shafts. [Explanation of Symbols]

[0083] 100 Extruders (Screw Machines) 10 screws 10a screw 10b screw 14. Mixing and Transfer Section 16 disk elements 16a disk 20 barrels 21 Cylinders 22 1st supply hole 23 Discharge port 24 Side feed holes (second supply holes) 30 Main supply device (1st supply section) 40 Side feed device (second supply unit) 50 First motor (drive source) 161 End disk 162 Intermediate disk α Torsion angle

Claims

1. It is a screw machine, A screw that is rotationally driven around an axis by a drive source, attaches a second material to a first material supplied at the base end and conveys it to the tip end, A barrel into which the cylinder into which the screw is inserted is formed, Equipped with, The aforementioned barrel, The base end has a first supply hole for supplying the first material into the cylinder, A second supply hole is provided at a position spaced apart from the first supply hole toward the tip side for supplying the second material, A discharge port for discharging the first material and the second material from the cylinder to the outside of the barrel, It has, The aforementioned screw is The apparatus has a kneading and transferring section provided in a position that includes the area in which the second material is supplied from the second supply hole, and which attaches the second material to the first material and conveys it while kneading it, Screw machine.

2. A screw machine according to claim 1, The kneading and transfer unit has a disk element composed of a plurality of disks arranged in stacked positions in the transfer direction, The twist angle of adjacent disks is between 10 and 30 degrees. Screw machine.

3. A screw machine according to claim 2, When the thickness of the disk is L and the outer diameter is D, the ratio L / D is in the range of 0.2 to 1.

25. Screw machine.

4. A screw machine according to claim 2, The end disks provided at the uppermost and lowermost points in the transport direction among the multiple disks have a smaller thickness in the transport direction than the intermediate disks provided between the end disks. Screw machine.

5. A screw machine according to claim 4, The end disk has half the thickness of the intermediate disk. Screw machine.

6. A screw machine according to claim 5, The disk elements are arranged in a plurality in the transport direction, The end disks adjacent to other disk elements are set to the same twist angle. Screw machine.

7. A screw machine according to any one of claims 1 to 6, The second material has a bulk density of 0.2 or less. Screw machine.

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