Supercritical Fluid-Assisted Polymer Extrusion Molding Machine

Abstract

The present application discloses a supercritical fluid-assisted polymer material extrusion molding machine, which relates to the field of plastic extrusion molding technology and includes a molding unit and a supercritical fluid supply unit. The molding unit includes a barrel, a screw, and a driving mechanism, and the driving mechanism is used to drive the screw to rotate in the barrel. The barrel is provided with a supercritical fluid input hole, through which the supercritical fluid supply unit injects supercritical fluid. The barrel is provided with a bypass pipe, both ends of which are fixedly connected to the barrel and communicate with the inner cavity of the barrel at the same time. The bypass pipe is a thin-walled metal pipe, and the inner diameter of the bypass pipe is less than or equal to the clearance width between the screw and the barrel. The bypass pipe is fixedly connected to the barrel, is located downstream of the input hole, and an exciter is installed on the outer peripheral surface of the bypass pipe. In the present application, the exciter can indirectly vibrate the polymer material in the barrel, so that the molten polymer material and the supercritical fluid can be fully and evenly mixed.

Description

Technical Field

[0001] This application relates to the field of plastic extrusion molding technology, and particularly to a supercritical fluid assisted polymer material extrusion molding machine. Background Art

[0002] Supercritical refers to the state of a substance when both its pressure and temperature exceed its critical pressure and critical temperature simultaneously. Substances in the supercritical state have high compressibility and a density close to that of ordinary liquids, and thus have good performance in dissolving other substances.

[0003] Critical foaming molding is a process in injection molding, extrusion, and blow molding. First, supercritical carbon dioxide, nitrogen, or other gases are injected into the plasticizing device. After the gases are fully and evenly mixed / diffused with the molten raw material to form a single-phase mixed sol, the sol is then introduced into the mold cavity or extrusion die, causing a large pressure drop in the sol, thereby causing the gas to precipitate and form a large number of bubble nuclei. During the subsequent cooling and molding process, the bubble nuclei inside the sol grow and form, ultimately obtaining a microcellular foamed plastic product.

[0004] The basic process of supercritical fluid microcellular plastic extrusion molding is as follows: Polymer material pellets or powders enter the barrel of the extruder from the hopper opening for plasticization. At the same time, the supercritical fluid stored in the gas storage cylinder is pumped into the barrel by a high-pressure plunger pump. The supercritical fluid is mixed with the molten material in the barrel, and finally a single-phase system of supercritical fluid / molten polymer material is formed. The single-phase system undergoes thermodynamic instability-induced bubble nucleation due to a sudden pressure drop at the die head of the extruder. By controlling the die head temperature of the extruder, the cell structure is solidified and shaped to obtain a microcellular foamed product. The continuous extrusion molding of microcellular plastics has a short cycle and high production efficiency, and is suitable for the industrial production of microcellular plastics.

[0005] However, due to the short residence time of the molten material in the extruder barrel, it is difficult for the molten polymer material and the supercritical fluid to be fully and evenly mixed. Also, due to the complexity of the microcellular plastic extrusion molding process, the products obtained by microcellular plastic extrusion molding often have uneven cell sizes and unstable cell densities. Summary of the Invention

[0006] In order to enable the supercritical fluid injected into the barrel to be fully and evenly mixed with the plastic melt with a very short residence time in the barrel, forming a single-phase system of supercritical fluid / molten polymer material with a high gas content, and obtaining microcellular plastics with a large cell density and uniform cell sizes, this application provides a supercritical fluid assisted polymer material extrusion molding machine.

[0007] The supercritical fluid assisted polymer material extrusion molding machine provided by this application adopts the following technical solutions:

[0008] Supercritical fluid assisted polymer material extrusion molding machine, including a molding unit and a supercritical fluid supply unit. The molding unit includes a barrel, a screw and a driving mechanism, and the driving mechanism is used to drive the screw to rotate in the barrel. The barrel is provided with a supercritical fluid input hole, and the input hole is for the supercritical fluid supply unit to inject supercritical fluid. The barrel is provided with a bypass pipe, both ends of the bypass pipe are fixedly connected to the barrel respectively, and at the same time communicate with the inner cavity of the barrel. The bypass pipe is a thin-walled metal pipe, the inner diameter of the bypass pipe is less than or equal to the clearance width between the screw and the barrel, the bypass pipe is located downstream of the input hole, and an exciter is installed on the outer peripheral surface of the bypass pipe.

[0009] By adopting the above technical solution, the driving mechanism drives the screw to rotate, so that the screw extrudes the molten polymer material in the barrel. During this process, the supercritical fluid supply unit inputs the supercritical fluid into the barrel from the input hole, so that the supercritical fluid is mixed with the polymer material. When the mixture of the polymer material and the supercritical fluid passes through the bypass pipe, part of the polymer material enters the bypass pipe and then enters the barrel through the bypass pipe. During the process that the molten polymer material flows through the bypass pipe, the exciter vibrates the polymer material in the bypass pipe through the pipe wall of the bypass pipe, and then indirectly vibrates the polymer material in the barrel, so that the molten polymer material and the supercritical fluid can be fully and evenly mixed, and the cell density distribution is stable. The bypass pipe is set as a thin-walled metal pipe, so that the bypass pipe is relatively easy to vibrate driven by the exciter. Since the polymer material in the bypass pipe and the polymer material in the barrel are continuous, the exciter can indirectly vibrate the polymer material in the barrel. The exciter does not need to directly vibrate the screw or the barrel, which can reduce the vibration effect of the exciter on the screw and the barrel, is beneficial to reducing the dynamic friction between the screw and the barrel, and is beneficial to protecting the screw and the barrel.

[0010] Optionally, both ends of the bypass pipe are respectively sleeved with union sleeves. The union sleeve is provided with an inner flange, both ends of the bypass pipe are respectively provided with outer flanges, and the outer flanges are used to prevent the union sleeve from detaching from the bypass pipe. A buffer pad is arranged between the inner flange of the union sleeve and the corresponding outer flange. The union sleeve is provided with an internal thread. The barrel is provided with two connecting pipes, and the connecting pipes are provided with external threads adapted to the internal threads. The two connecting pipes are respectively connected to the two union sleeves correspondingly. A metal O-ring is arranged inside the union sleeve, and the metal O-ring is located between the outer flange and the end face of the connecting pipe far away from the barrel. An annular groove is arranged on the end face of the connecting pipe far away from the barrel or the end face of the outer flange close to the barrel, and the annular groove is used to accommodate the metal O-ring.

[0011] By adopting the above technical solution, both ends of the bypass pipe are detachably connected to two joint pipes through union sleeves respectively, which facilitates the disassembly and cleaning of the bypass pipe. When the union sleeve is connected to the joint pipe, the union sleeve and the joint pipe are screwed and locked, so that the end face of the joint pipe and the outer flange jointly extrude the metal O-ring, and the metal O-ring plays a sealing role at the connection position between the joint pipe and the bypass pipe. The metal O-ring is made of metal material, which is not easy to fail under the high temperature of the molten polymer material and is not easy to fuse with the molten polymer material. On the other hand, both sides of the outer flange of the bypass pipe are buffered by the metal O-ring and the buffer pad respectively, so that the vibration of the bypass pipe is not easily transmitted to the joint pipe, which is beneficial to further reduce the vibration effect of the vibrator on the barrel.

[0012] Optionally, the buffer pad is a spring washer.

[0013] By adopting the above technical solution, the spring washer can play a role in preventing loosening in the connection between the union sleeve and the joint pipe, thereby reducing the loosening of the connection part between the union sleeve and the joint pipe under the vibration of the vibrator.

[0014] Optionally, the joint pipe is provided with a vibration isolator, and the vibration isolator is used to connect an external fixed member.

[0015] By adopting the above technical solution, the vibration isolator is fixedly connected to the external structure, and the vibration isolator can play a role in strengthening the joint pipe to further reduce the vibration effect of the vibrator on the joint pipe and the barrel.

[0016] Optionally, the vibration isolator includes a fixed connecting rod and a fixed connecting piece. The fixed connecting piece includes a first clamping plate and a second clamping plate. The first clamping plate and the second clamping plate are detachably connected. The first clamping plate and the second clamping plate jointly clamp the joint pipe, and the fixed connecting rod is fixedly connected to the side of the first clamping plate away from the second clamping plate.

[0017] By adopting the above technical solution, the fixed connecting piece of the vibration isolator is detachably connected to the joint pipe, so that the barrel of the forming unit can be separated from the vibration isolator, making the forming unit easy to disassemble and assemble.

[0018] Optionally, the vibrator is connected to the bypass pipe through a mounting seat. The mounting seat includes a first clip and a second clip. The first clip and the second clip are detachably connected. The first clip and the second clip jointly clamp the bypass pipe, and the vibrator is fixedly installed on the side of the first clip away from the second clip.

[0019] By adopting the above technical solution, the vibrator is fixed on the first clamping piece of the mounting seat, and the first clamping piece and the second clamping piece of the mounting seat are detachably connected, so that the mounting seat is detachably mounted on the bypass pipe, making the disassembly and assembly of the vibrator relatively convenient.

[0020] Optionally, the bypass pipe is coated with a heat insulation layer.

[0021] By adopting the above technical solution, the bypass pipe uses the heat insulation layer to insulate from the outside world, which can reduce the heat loss of the bypass pipe to ensure the fluidity of the molten polymer material in the bypass pipe.

[0022] Optionally, both ends of the bypass pipe are tangentially connected to the barrel, and both ends of the bypass pipe are arranged staggeredly along the length direction of the barrel and are respectively located on both sides of the center line of the bypass pipe, and the pipe orifice orientation of the bypass pipe is adapted to the tangential speed of the rotation of the screw.

[0023] By adopting the above technical solution, the orientations of the two ports of the bypass pipe are adapted to the tangential speed of the rotation of the screw, making it easier for the molten polymer material to enter and exit the bypass pipe.

[0024] Optionally, a spiral compensation sleeve is sleeved on the screw, the spiral compensation sleeve is fixedly connected to the screw, the volume of the material of the spiral compensation sleeve is greater than or equal to the volume of the bypass pipe, and the position of the spiral compensation sleeve in the axial direction of the screw corresponds to the position of the feeding port of the bypass pipe.

[0025] By adopting the above technical solution, the polymer material in the barrel enters the bypass pipe, which changes the density of the material in the barrel. By setting a spiral compensation sleeve at the position of the screw corresponding to the feeding port of the bypass pipe, the space occupied by the spiral compensation sleeve is used to compensate for the volume change caused by the reduction of the polymer material, making the density of the material in the barrel generally more balanced.

[0026] Optionally, the spiral compensation sleeve includes a plurality of arc-shaped plates, the arc-shaped plates are sequentially connected along the spiral direction of the screw, the arc angle of the arc-shaped plate is between 180 degrees and 200 degrees, and the arc-shaped plate is fixedly installed on the screw by screws.

[0027] By adopting the above technical solution, the arc-shaped plates are sequentially connected to form a spiral compensation sleeve, the arc-shaped plates are fixedly installed on the screw by screws, and the arc angle of the arc-shaped plate is between 180 degrees and 200 degrees, enabling the arc-shaped plate to hold the screw.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] During the process that the molten polymer material flows through the bypass pipe, the vibrator vibrates the polymer material in the bypass pipe through the pipe wall of the bypass pipe, thereby indirectly vibrating the polymer material in the barrel, enabling the molten polymer material and the supercritical fluid to be fully and evenly mixed, and stabilizing the cell density distribution.

[0030] The vibration isolator is fixedly connected to the external structure, and the vibration isolator can play a reinforcing role on the joint pipe to further reduce the vibration effect of the vibrator on the joint pipe and the barrel. Description of the Drawings

[0031] Figure 1 is the overall structural schematic diagram of this embodiment.

[0032] Figure 2 is the side view of this embodiment for showing the connection relationship between the bypass pipe and the barrel.

[0033] Figure 3 is the cross-sectional view of this embodiment for showing the connection relationship between the bypass pipe and the joint pipe.

[0034] Figure 4 is Figure 3 the enlarged view of part A in

[0035] Figure 5 is the schematic diagram of this embodiment for showing the installation state of the spiral compensating sleeve.

[0036] Description of the Reference Numerals:

[0037] 10, forming unit; 1, barrel; 11, input hole; 12, bypass pipe; 121, outer flange; 13, union sleeve; 131, internal thread; 132, inner flange; 14, joint pipe; 141, external thread; 142, annular groove; 15, buffer pad; 16, metal O-ring; 17, vibration isolator; 171, fixed connecting rod; 172, fixed connecting piece; 1721, first clamping plate; 1722, second clamping plate; 18, heat insulation layer; 181, inner heat insulation cotton layer; 182, outer spiral sheath layer; 2, screw; 21, spiral compensating sleeve; 211, arc plate; 3, hopper; 4, heater; 6, driving mechanism; 5, vibrator; 51, mounting seat; 511, first clip; 512, second clip; 20, supercritical fluid supply unit; 7, gas storage cylinder; 8, high-pressure plunger pump; 9, gas injection joint. Detailed Description of the Embodiment

[0038] The following Figures 1-5 further describes the present application in detail with reference to the attached drawings.

[0039] The embodiment of the present application discloses a supercritical fluid assisted polymer material extrusion molding machine. Refer to Figure 1The supercritical fluid-assisted polymer material extrusion molding machine includes a molding unit 10 and a supercritical fluid supply unit 20. The supercritical fluid supply unit 20 includes a gas storage bottle 7, a high-pressure plunger pump 8 and a gas injection joint 9. The high-pressure plunger pump 8 is connected to the gas storage bottle 7 and the gas injection joint 9 through a pipeline. The high-pressure plunger pump 8 pumps the supercritical fluid in the gas storage bottle 7 into the barrel 1 through the gas injection joint 9.

[0040] The molding unit 10 includes a barrel 1, a screw 2, a hopper 3, a heater 4 and a driving mechanism 6. The hopper 3 is connected to the inner cavity of the barrel 1, the heater 4 is installed on the outer surface of the barrel 1, and the driving mechanism 6 is an electric motor with a reducer. The driving mechanism 6 is used to drive the screw 2 to rotate in the barrel 1 so that the screw 2 pushes the molten polymer material in the barrel 1 to the front end of the barrel 1; the barrel 1 is provided with a supercritical fluid input hole 11, and the input hole 11 is used for the supercritical fluid supply unit 20 to inject supercritical fluid.

[0041] The barrel 1 is provided with a bypass pipe 12, both ends of which are fixedly connected to the barrel 1 respectively and connected to the inner cavity of the barrel 1 at the same time. The bypass pipe 12 is a thin-walled metal pipe. The bypass pipe 12 is located downstream of the input hole 11, that is, the bypass pipe 12 is close to the outlet end of the barrel 1 relative to the input hole 11. An exciter 5 is installed on the outer peripheral surface of the bypass pipe 12. The exciter 5 is a vibration motor or an ultrasonic generator. The exciter 5 is close to the outlet end of the bypass pipe 12.

[0042] The driving mechanism 6 drives the screw 2 to rotate, so that the screw 2 pushes the molten polymer material in the barrel 1 forward. In this process, the supercritical fluid supply unit 20 inputs the supercritical fluid into the barrel 1 from the input hole 11, so that the supercritical fluid is mixed with the polymer material. When the mixture of the polymer material and the supercritical fluid passes through the bypass pipe 12, part of the polymer material enters the bypass pipe 12, and then enters the barrel 1 through the bypass pipe 12. In the process of the molten polymer material flowing through the bypass pipe 12, the vibrator 5 vibrates the polymer material in the bypass pipe 12 through the pipe wall of the bypass pipe 12, and then indirectly vibrates the polymer material in the barrel 1, so that the molten polymer material and the supercritical fluid can be fully and evenly mixed, so that the pore density distribution is stable, and it can adapt to the preparation of thin and fine structure foaming materials, for example, it can make the pore density in the foaming yarn more uniform.

[0043] Reference Figure 2 and Figure 3 The two ends of the bypass pipe 12 are tangentially connected to the barrel 1. The two ends of the bypass pipe 12 are staggered with each other along the length direction of the barrel 1 and are respectively located on both sides of the center line of the bypass pipe 12. The direction of the pipe mouth of the bypass pipe 12 is tangentially adapted to the rotation speed of the screw 2.

[0044] In this embodiment, within the range where the inner diameter of the bypass pipe 12 is smaller than the variation in the clearance width between the screw 2 and the barrel 1, the clearance width between the screw 2 and the barrel 1 refers to the unilateral width of the annular clearance between the screw 2 and the barrel 1.

[0045] Referring to Figure 3 and Figure 4 , both ends of the bypass pipe 12 are respectively sleeved with union nuts 13. The union nuts 13 are provided with internal threads 131; the union nuts 13 are provided with internal flanges 132, and both ends of the bypass pipe 12 are respectively provided with external flanges 121. The inner diameter of the internal flange 132 is larger than the outer diameter of the bypass pipe 12 and smaller than the outer diameter of the external flange 121. The external flange 121 is used to prevent the union nut 13 from detaching from the bypass pipe 12. A buffer pad 15 is provided between the internal flange 132 of the union nut 13 and the corresponding external flange 121. The buffer pad 15 is a spring gasket, specifically, it can be a disc spring gasket or a corrugated spring gasket, etc. The spring gasket can also be replaced with a rubber gasket, a silicone gasket or a cork gasket, etc.

[0046] The barrel 1 is provided with two connecting pipes 14. The connecting pipes 14 are provided with external threads 141 adapted to the internal threads 131. The two connecting pipes 14 are respectively connected to the two union nuts 13 correspondingly; a metal O-ring 16 is provided inside the union nut 13. The metal O-ring 16 is located between the external flange 121 and the end face of the connecting pipe 14 away from the barrel 1. An annular groove 142 is provided on the end face of the connecting pipe 14 away from the barrel 1 or on the end face of the external flange 121 close to the barrel 1. The annular groove 142 is used to accommodate the metal O-ring 16.

[0047] Referring to Figure 2 and Figure 3 , the connecting pipe 14 is provided with a vibration isolator 17. The vibration isolator 17 is a steel component. The vibration isolator 17 includes a fixed connecting rod 171 and a fixed connecting piece 172. The fixed connecting piece 172 includes a first clamping plate 1721 and a second clamping plate 1722. The first clamping plate 1721 and the second clamping plate 1722 are detachably connected by a bolt and nut assembly. The first clamping plate 1721 and the second clamping plate 1722 jointly clamp the connecting pipe 14. The fixed connecting rod 171 is fixedly welded to the side of the first clamping plate 1721 away from the second clamping plate 1722. The fixed connecting rod 171 is used to connect an external fixed component, such as the frame of an extrusion molding machine or a building structure adjacent to the extrusion molding machine.

[0048] Referring to Figure 3 , the vibrator 5 is connected to the bypass pipe 12 through a mounting seat 51. The mounting seat 51 includes a first clip 511 and a second clip 512. The first clip 511 and the second clip 512 are detachably connected by a bolt and nut assembly. The first clip 511 and the second clip 512 jointly clamp the bypass pipe 12. The vibrator 5 is fixedly installed on the side of the first clip 511 away from the second clip 512.

[0049] Reference Figure 4 , the bypass pipe 12 is coated with a heat insulation layer 18. The heat insulation layer 18 includes an inner heat insulation cotton layer 181 and a spiral sheath outer layer 182. The heat insulation cotton covers the outer peripheral surface of the bypass pipe 12. The heat insulation cotton material of the inner heat insulation cotton layer 181 is glass wool or rock wool, etc. The heat insulation cotton material is wound and covered with a spiral sheath to form a layered structure. The spiral sheath covering the heat insulation cotton material serves as the spiral sheath outer layer 182, and the spiral sheath is fixed by tying with a cable tie or steel wire, etc.

[0050] Reference Figure 5 , a spiral compensation sleeve 21 is sleeved on the screw rod 2. The spiral compensation sleeve 21 includes a plurality of arc-shaped plates 211. The arc-shaped plates 211 are connected in sequence along the spiral direction of the screw rod 2. The arc angle of the arc-shaped plate 211 is between 180 degrees and 200 degrees. The number of the arc-shaped plates 211 is set according to the multiple of the pitch of the bypass pipe 12 striding across the screw rod 2. The arc-shaped plates 211 are attached and installed on the screw rod 2 by screws. The volume of the material of the spiral compensation sleeve 21 is greater than or equal to the volume of the bypass pipe 12. The position of the spiral compensation sleeve 21 in the axial direction of the screw rod 2 is located between the two ends of the bypass pipe 12. By arranging the spiral compensation sleeve 21 at the position corresponding to the feeding port of the bypass pipe 12 on the screw rod 2, the volume change caused by the reduction of the polymer material is compensated by the space occupied by the spiral compensation sleeve 21, so that the density of the material in the barrel 1 is generally more balanced.

[0051] The implementation principle of the supercritical fluid-assisted polymer material extrusion molding machine in the embodiment of the present application is as follows: The bypass pipe 12 is set as a thin-walled metal pipe, so that the bypass pipe 12 is relatively easy to vibrate under the drive of the vibrator 5, thereby indirectly vibrating the polymer material in the barrel 1 by the bypass pipe 12. The vibrator 5 does not need to directly vibrate the screw rod 2 or the barrel 1, which can reduce the vibration effect of the vibrator 5 on the screw rod and the barrel 1, is beneficial to reducing the dynamic friction between the screw rod 2 and the barrel 1, and is beneficial to protecting the screw rod 2 and the barrel 1.

[0052] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. Supercritical fluid assisted polymer material extrusion molding machine, characterized in that: It includes a forming unit (10) and a supercritical fluid supply unit (20). The forming unit (10) includes a barrel (1), a screw (2) and a driving mechanism (6). The driving mechanism (6) is used to drive the screw (2) to rotate in the barrel (1). The barrel (1) is provided with a supercritical fluid input hole (11) through which the supercritical fluid supply unit (20) injects supercritical fluid. The barrel (1) is provided with a bypass pipe (12). Both ends of the bypass pipe (12) are fixedly connected to the barrel (1) and communicate with the inner cavity of the barrel (1) at the same time. The bypass pipe (12) is a thin-walled metal pipe. The inner diameter of the bypass pipe (12) is less than or equal to the clearance width between the screw (2) and the barrel (1). The bypass pipe (12) is located downstream of the input hole (11), and a vibrator (5) is installed on the outer peripheral surface of the bypass pipe (12). Both ends of the bypass pipe (12) are respectively sleeved with union nuts (13). The union nuts (13) are provided with inner flanges (132). Both ends of the bypass pipe (12) are respectively provided with outer flanges (121). The outer flanges (121) are used to prevent the union nuts (13) from detaching from the bypass pipe (12). A buffer pad (15) is arranged between the inner flange (132) of the union nut (13) and the corresponding outer flange (121). The union nut (13) is provided with an internal thread (131). The barrel (1) is provided with two connecting pipes (14). The connecting pipes (14) are provided with external threads (141) adapted to the internal threads (131). The two connecting pipes (14) are respectively connected to the two union nuts (13) correspondingly. A metal O-ring (16) is arranged inside the union nut (13). The metal O-ring (16) is located between the outer flange (121) and the end face of the connecting pipe (14) away from the barrel (1). An annular groove (142) is arranged on the end face of the connecting pipe (14) away from the barrel (1) or the end face of the outer flange (121) close to the barrel (1). The annular groove (142) is used to accommodate the metal O-ring (16). A spiral compensation sleeve (21) is sleeved on the screw (2). The spiral compensation sleeve (21) is fixedly connected to the screw (2). The volume of the material of the spiral compensation sleeve (21) is greater than or equal to the volume of the bypass pipe (12). The position of the spiral compensation sleeve (21) in the axial direction of the screw (2) is between both ends of the bypass pipe (12).

2. The supercritical fluid-assisted polymer material extrusion molding machine according to claim 1, wherein: The buffer pad (15) is a spring washer.

3. The supercritical fluid assisted polymer material extrusion molding machine according to claim 1, wherein: The connecting pipe (14) is provided with a vibration isolator (17) which is used to connect an external fixed member.

4. The supercritical fluid-assisted polymer material extrusion molding machine according to claim 3, characterized in that: The vibration isolator (17) includes a fixed connecting rod (171) and a fixed connecting piece (172). The fixed connecting piece (172) includes a first clamping plate (1721) and a second clamping plate (1722). The first clamping plate (1721) is detachably connected to the second clamping plate (1722). The first clamping plate (1721) and the second clamping plate (1722) jointly clamp the joint pipe (14). The fixed connecting rod (171) is fixedly connected to the side of the first clamping plate (1721) away from the second clamping plate (1722).

5. The supercritical fluid-assisted polymer material extrusion molding machine according to claim 1, wherein: The vibrator (5) is connected to the bypass pipe (12) through a mounting seat (51). The mounting seat (51) includes a first clamping piece (511) and a second clamping piece (512). The first clamping piece (511) is detachably connected to the second clamping piece (512). The first clamping piece (511) and the second clamping piece (512) jointly clamp the bypass pipe (12). The vibrator (5) is fixedly installed on the side of the first clamping piece (511) away from the second clamping piece (512).

6. The supercritical fluid-assisted polymer material extrusion molding machine according to claim 1, wherein: The bypass pipe (12) is coated with a heat insulation layer (18).

7. The supercritical fluid assisted polymer material extrusion molding machine according to claim 1, characterized in that: Both ends of the bypass pipe (12) are tangentially connected to the barrel (1). The two ends of the bypass pipe (12) are arranged staggeredly along the length direction of the barrel (1), and are respectively located on both sides of the center line of the bypass pipe (12). The pipe orifice direction of the bypass pipe (12) is adapted to the tangential speed of the rotation of the screw (2).

8. The supercritical fluid-assisted polymer material extrusion molding machine according to claim 1, wherein: The spiral compensation sleeve (21) includes a plurality of arc-shaped plates (211). The arc-shaped plates (211) are sequentially connected along the spiral direction of the screw (2). The arc angle of the arc-shaped plate (211) is between 180 degrees and 200 degrees. The arc-shaped plate (211) is attached to the screw (2) by screws.

Images