Polymer melt composite vibration extrusion molding device

Abstract

The present invention discloses a polymer melt composite vibration extrusion molding device, including a composite vibration system including a feed die composed of an upper die and a lower die, a feed die parting surface provided with a flow channel that runs through both ends of the feed die and is used for polymer melt to flow; the upper die is provided with at least one first through hole, and the lower die is provided with at least one second through hole; the first through hole and the second through hole are respectively perpendicular to and connected with the flow channel; a medium and low frequency vibration module includes a vibration rod installed in the first through hole and extending into the flow channel, and a driving member drives the vibration rod to perform piston movement in the first through hole; a high frequency ultrasonic module includes an ultrasonic vibration head arranged at one end of a variable amplitude rod; the variable amplitude rod is installed in the second through hole and the ultrasonic vibration head extends into the flow channel. The present invention can significantly improve the processing performance of polymers, and the composite vibration field can also change the microstructure morphology of polymers, thereby improving the mechanical properties and thermal properties of products, etc., and realizing industrialized polymer melt extrusion production and application.

Description

Technical Field

[0001] The invention relates to the field of polymer processing equipment, in particular to a polymer melt composite vibration extrusion molding device. Background Art

[0002] The existing mainstream polymer melt composite vibration extrusion molding device can only provide a simple shear field, and the shear direction, shear rate, etc. are unchanged. This simple shear field can cause the slippage of the molecular chains between the upstream layers perpendicular to the flow direction, so that the entanglement points are released to a certain extent, causing the viscosity to decrease, which is called "shear thinning". Although the viscosity decrease caused by shear thinning is beneficial to the processing process, due to the constant shear rate and short shear time, when the recovery entanglement caused by the thermal motion of the molecular chain and the shear-induced disentanglement reach a dynamic equilibrium, the entanglement state of the molecular chain will remain unchanged, the disentanglement will not continue, and the viscosity will remain unchanged.

[0003] The Chinese invention patent with the publication number CN110815628A discloses a polymer melt disentanglement device, which specifically discloses a method of applying a circumferential rotation stress field or a circumferential vibration stress field or a composite motion stress field of circumferential rotation and circumferential vibration to the melt, so that the molecular chains in the melt are gradually moved away when the force direction is continuously changed by tension and relaxation under the circumferential shear field or circumferential vibration field, especially under the composite stress field of circumferential shear and circumferential vibration superposition, thereby achieving a high degree of disentanglement. The problems it has are as follows: 1. Its disentanglement method is relatively single, mainly relying on mechanical methods (vibration + shearing), and the disentanglement effect is limited; 2. The direction in which the polymer melt enters the device is different from the direction of the extrusion device, and an additional power device (drive motor) is required to make the polymer melt flow and extrude in a specified direction.

[0004] The Chinese invention patent with publication number CN114633448A discloses a testing machine with integrated functions of wide-band vibration test / rheological measurement, which specifically discloses that high-amplitude and low-frequency mechanical vibration and high-frequency and low-amplitude ultrasonic vibration are used together to form a wide-band vibration field to improve the processing efficiency and mechanical properties of polymers. However, it has the following shortcomings:

[0005] 1. Its feed port, material flow channel and discharge port are perpendicular to each other, and the flow direction of the polymer needs to pass through two 90-degree right angles. Obviously, these right angles will inevitably lead to a slower flow rate and lower temperature of the polymer melt here. However, since it is a test instrument, as long as it produces material at the discharge port, even if the material fluidity becomes worse or the temperature is lower, it will not affect the measurement of its performance in subsequent experiments. If it is used in industrial production, it will be a big problem;

[0006] 2. Its mechanical vibration direction reciprocates along the flow direction of the polymer melt, which is equivalent to applying a single-direction shear flow field in the melt flow direction. The melt is sheared by friction with the upper and lower mold walls. It is consistent with the shear field principle in the conventional extrusion process, except that the melt is pushed back and forth on both sides for shearing. This shear field is difficult to achieve effective disentanglement. In the direction perpendicular to the flow, due to the speed difference between layers, the macromolecules will slip relative to each other, so that the cohesion entanglement points and topological entanglement points are both released to a certain extent, causing the viscosity to decrease. This disentanglement is inevitable in the processing process, but the disentanglement effect is general, and it cannot achieve deep disentanglement and efficient disentanglement. On the other hand, its ultrasonic vibration head acts on the mold, rather than directly on the polymer melt, which weakens its disentanglement effect to a certain extent. Summary of the invention

[0007] In response to the above technical problems, the present application provides a polymer melt composite vibration extrusion molding device with medium and low frequency mechanical vibration + ultrasonic vibration, which has a simple structure and is suitable for industrial production applications.

[0008] In order to achieve the above invention objectives, this application provides the following technical solutions:

[0009] A polymer melt composite vibration extrusion molding device, comprising a bracket, a composite vibration system, a driving device, an extruder connecting piece and a die;

[0010] The bracket is used to fix and install the composite vibration system and the driving device;

[0011] The composite vibration system includes a feeding die, a medium and low frequency vibration module and a high frequency ultrasonic module;

[0012] The transfer mold is composed of an upper mold and a lower mold. The transfer mold parting surface is provided with a flow channel that runs through both ends of the transfer mold and allows the polymer melt to flow. The upper mold is provided with at least one first through hole, and the lower mold is provided with at least one second through hole. The first through hole and the second through hole are respectively perpendicular to the flow channel and connected.

[0013] The medium and low frequency vibration module comprises a vibration rod and a driving member; the vibration rod is installed in the first through hole and extends into the flow channel, and the end of the vibration rod away from the upper mold is connected to the driving member, and the driving member is used to drive the vibration rod to perform piston movement in the first through hole;

[0014] The high-frequency ultrasonic module includes an ultrasonic vibration head and a horn; the ultrasonic vibration head is arranged at one end of the horn; the horn is installed in the second through hole and the ultrasonic vibration head extends into the flow channel.

[0015] The driving device is used to provide power to the driving member;

[0016] The two ends of the flow channel are respectively connected to the extruder connecting piece and the die.

[0017] In some preferred embodiments, the parting surfaces of the upper mold and the lower mold are stepped.

[0018] In some preferred embodiments, a convergent boss is further provided at a position of the flow channel surface facing the second through hole, so as to reduce the thickness of the flow channel at this position.

[0019] In some preferred embodiments, a wear-resistant sleeve is disposed in the first through hole, the inner surface of the wear-resistant sleeve has a clearance fit with the vibration rod, and the outer surface of the wear-resistant sleeve has an interference fit with the first through hole; and a flexible sleeve is disposed in the second through hole.

[0020] In some preferred embodiments, the cross-sectional shape of the flow channel is rectangular, and the width thereof is not less than the diameter of any one of the first through hole and the second through hole.

[0021] In some preferred embodiments, the driving member includes a horizontal slide groove; the vibration rod is connected to the horizontal slide groove via a sliding block arranged at one end away from the mold.

[0022] In some preferred embodiments, a plurality of third through holes are provided on a side of the horizontal slide groove away from the left groove, and threaded blind holes are provided at positions of the sliding block corresponding to the third through holes.

[0023] In some preferred embodiments, the driving member further includes a telescopic member; the movable end of the telescopic member is connected to the horizontal slide groove; and the driving device provides power for the movement of the telescopic member.

[0024] Beneficial Effects

[0025] 1. The polymer melt flow channel is reasonably designed. The extruder can be connected at the feed end of the flow channel and the die can be connected at the discharge end. The superposition of high-frequency ultrasonic vibration and medium- and low-frequency vibration can greatly reduce the viscosity of the polymer melt. The device can significantly improve the polymer processing performance. The composite vibration field can also change the microstructure of the polymer, thereby improving the mechanical and thermal properties of the product, etc., and realizing the industrialized polymer melt extrusion production application;

[0026] 2. The continuous disentanglement and molding of polymer melt can be achieved through the composite external force field of ultrasonic vibration and mechanical vibration, which can greatly reduce the melt viscosity and improve the polymer extrusion processing performance, reduce the die pressure, increase the extrusion flow rate, reduce the die expansion, and improve the unstable flow of the melt; it can improve the degree of crystallization of the polymer, form an oriented structure, improve the distribution of fillers, and greatly improve the mechanical properties of the extruded products.

[0027] 3. After chain disentanglement, the macromolecules have higher mobility, the ordering process of the system is accelerated, and the crystallization ability of the polymer is enhanced, making the "structural" process of the polymer melt crystal morphology easier to control and adjust, so that under the induction of external fields or nucleating agents, special crystal structures such as string crystal structures and columnar crystal structures can be generated, which can improve the degree of crystallization perfection and produce oriented structures, thereby significantly improving the physical and mechanical properties of the products. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the shaft side structure of a preferred embodiment of the present invention;

[0029] Figure 2 It is a front view structural schematic diagram of a preferred embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the shaft side structure of a composite vibration system in a preferred embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of the front view structure of a composite vibration system in a preferred embodiment of the present invention;

[0032] Figure 5 It is a schematic diagram of the side structure of a composite vibration system in a preferred embodiment of the present invention;

[0033] Figure 6 It is an enlarged schematic diagram of the main structure of the AA section in a preferred embodiment of the present invention;

[0034] Figure 7 It is a structural schematic diagram of the installation of the extruder connector and the die of the material transfer die of the AA section in a preferred embodiment of the present invention;

[0035] Figure 8 It is an enlarged schematic diagram of the AA cross-section structure of the feeding die in a preferred embodiment of the present invention;

[0036] Fig. 9 It is an enlarged schematic diagram of the BB cross-section structure of the feeding die in a preferred embodiment of the present invention;

[0037] Fig.10 This is a schematic diagram of the results of LDPE extrusion mechanical properties in a preferred experimental example of the present invention;

[0038] Fig.11 This is a schematic diagram of the PLA extrusion mechanical properties results in a preferred experimental example of the present invention;

[0039] Fig.12 The results of LDPE extrusion processing performance in a preferred experimental example of the present invention are shown in FIG. Figure 1 ;

[0040] Fig.13 The results of LDPE extrusion processing performance in a preferred experimental example of the present invention are shown in FIG. Figure 2 ;

[0041] Fig.14 The results of PLA extrusion processing performance in a preferred experimental example of the present invention are shown in FIG. Figure 1 ;

[0042] Fig.15 The results of PLA extrusion processing performance in a preferred experimental example of the present invention are shown in FIG. Figure 2 ;

[0043] In the figure: 1, bracket; 2, composite vibration system; 3, driving device; 4, extruder connector; 5, die; 21, feeding die; 22, medium and low frequency vibration module; 23, high frequency ultrasonic module; 210, convergent boss; 211, upper die; 212, lower die; 213, feed end; 214, discharge end; 215, flow channel; 216, first through hole; 217, second through hole; 218, wear-resistant sleeve; 219, flexible sleeve; 221, vibration rod; 222, driving member; 231, amplitude rod; 232, ultrasonic vibration head; 2221, horizontal slide; 2222, telescopic member; 2223, threaded blind hole; 2224, third through hole; DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described below in conjunction with the accompanying drawings. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0045] This embodiment discloses a polymer melt composite vibration extrusion molding device, such as Figure 1-Figure 9 As shown, it includes a bracket 1, a composite vibration system 2, a driving device 3, an extruder connecting piece 4 and a die 5;

[0046] The bracket 1 is used to fix and install the composite vibration system 2 and the driving device 3;

[0047] The composite vibration system 2 includes a feeding die 21, a medium and low frequency vibration module 22 and a high frequency ultrasonic module 23;

[0048] The feed die 21 is composed of an upper die 211 and a lower die 212. The parting surface of the feed die 21 is provided with a flow channel 215 that runs through both ends of the feed die 21 for the polymer melt to flow. The upper die 211 is provided with at least one first through hole 216, and the lower die 212 is provided with at least one second through hole 217. The first through hole 216 and the second through hole 217 are respectively perpendicular to and connected with the flow channel 215. In some preferred embodiments, in order to enable more precise positioning of the upper and lower dies 212 when they are closed, and to allow the greater pressure during the extrusion process to cause the material to overflow the flow channel 215 and enter the parting surface, causing leakage, the parting surfaces of the upper die 211 and the lower die 212 are stepped, for example, matching grooves and bosses are provided to solve the above problems. The cross-sectional size of the flow channel 215 is generally small. In order to make the vibration module and the high-frequency ultrasonic module 23 more fully contact the polymer melt in the flow channel 215, it is considered to design the cross-sectional shape of the flow channel 215 to be rectangular, and its width is not less than the diameter of any one of the first through hole 216 and the second through hole 217.

[0049] The medium and low frequency vibration module 22 includes a vibration rod 221 and a driving member 222; the vibration rod 221 is installed in the first through hole 216 and extends into the flow channel 215, and the end of the vibration rod 221 away from the upper mold 211 is connected to the driving member 222, and the driving member 222 is used to drive the vibration rod 221 to perform piston movement in the first through hole 216; it should be understood that there are many ways to drive the vibration rod 221, and various driving methods such as mechanical drive, electric drive, and hydraulic drive can be used. In this application, according to the different driving forms adopted, the vibration frequency of the vibration rod 221 is 0-200Hz, and the vibration amplitude is 0-140mm. In actual selection, in order to ensure sufficient amplitude, it generally does not exceed 10Hz.

[0050] The high-frequency ultrasonic module 23 includes an ultrasonic vibration head 232 and an horn 231; the ultrasonic vibration head 232 is arranged at one end of the horn 231; the horn 231 is installed in the second through hole 217 and the ultrasonic vibration head 232 extends into the flow channel 215. It should be understood that the ultrasonic vibration module is a commonly used device in the field. In addition to the ultrasonic vibration head 232 and the horn 231, it also includes necessary components such as an ultrasonic transmitter, a transducer, a cooling device, an ultrasonic generator and an electric parameter meter. Therefore, this application no longer describes structures and components that are not directly related to this technical solution. Since in this application, the ultrasonic vibration head 232 is inserted into the lower mold 212 from bottom to top, therefore, a suitable position on the outer surface of the horn 231 should also be provided with a connection device for connecting and fixing. In some preferred embodiments, it can be a connecting flange; when the horn 231 is inserted into place, the horn 231 is connected and fixed to the lower mold 212 by the connecting flange. In some other preferred embodiments, considering that the mold is generally a metal mold and ultrasonic waves are not suitable for directly acting on metal surfaces, a flexible sleeve 219 is provided in the second through hole 217, and the inner surface of the flexible sleeve 219 is interference fit with the ultrasonic vibration head 232, and the outer surface is transition fit with the second through hole 217. Preferably, the flexible sleeve 219 is high temperature rubber.

[0051] The driving device 3 is used to provide power to the driving member 222;

[0052] The two ends of the flow channel 215 are respectively connected to the extruder connector 4 and the die 5. It should be understood that the extruder connector 4 and the die 5 are both detachably connected to the feed die 21, preferably by flange connection. The extruder connector 4 is used to connect the die and the extruder, and the extruder can be any one of the twin-screw extruders and single-screw extruders commonly used in the art, and in order to realize industrial extrusion production, other necessary equipment such as a feeding device, a barrel, a preheating device, a cooling device, a traction device, etc., are all equipped by those skilled in the art as needed, because it is not the focus of the present invention, so it will not be repeated.

[0053] In order to improve the effect of the ultrasonic vibration head 232 on the polymer melt in the flow channel 215 and increase the penetration of ultrasonic waves, some preferred embodiments also consider providing a convergent boss 210 on the surface of the flow channel 215 opposite to the second through hole 217, so as to reduce the thickness of the flow channel 215 at this location, thereby achieving the following effects: 1. It helps to establish a higher pressure on both sides of the convergent boss 210 in the flow channel 215, so that the vibration module can better shear and stretch the polymer melt; 2. It reduces the thickness of the polymer melt at this location, so that it can better accept the high-frequency vibration force field of ultrasonic waves, so that ultrasonic waves can play a better penetration role, thereby achieving a better disentanglement effect.

[0054] It should be noted that from the perspective of melt disentanglement, in a simple shear force field generated by a single mechanical vibration, the cohesive entanglements perpendicular to the shear direction are pulled apart, while the cohesive entanglement points parallel to the shear direction are not greatly affected. When the topological entanglement point is located at one end of the molecular chain, the macromolecular chain may slip and be pulled apart in the shear force field, while when the entanglement point is in the middle of the macromolecule, it will become tighter and tighter in the pure shear force field and difficult to disengage, resulting in a limited degree of melt disentanglement.

[0055] However, in a single ultrasonic vibration field, the cavitation effect of ultrasound is reduced due to the high viscosity of the polymer melt, and its penetration ability is limited. In addition, in the absence of shear and stretching external fields, a single ultrasonic field can only relax the topological entanglement points, making it difficult to achieve relative sliding disentanglement of molecular chains from the entanglement points.

[0056] The design idea of ​​the present invention is to use ultrasound to apply ultra-high frequency impact to the melt to instantly break the condensation and entanglement in the melt, and then combine it with a high-frequency reciprocating vibration shear field. Under the action of the tension and relaxation vibration field, the shear force field can make the molecular chains gradually loosen and gradually pull apart from the opened entanglement points, thereby achieving a high degree of disentanglement.

[0057] At the same time, from the analysis of the essential characteristics of molecular chain movement, the molecular weight of the polymer chain has a certain dispersion and exhibits typical viscoelastic behavior characteristics. The response time of different molecular chains to the external field is inconsistent and is distributed within a time range (relaxation time spectrum). If the external field changes at a certain moment, some molecular chains may be able to respond in time to keep up with the pace of external field changes, but the majority of molecular chains will show varying degrees of lag and still move in the original way, resulting in differences in the movement of each molecular chain. The composite external field that combines different forms of movement can cause maximum disturbance to the melt, which is conducive to the "opening" of entangled molecular chains.

[0058] In some preferred embodiments, a specific structural example of a vibration rod 221 connected to a driving member 222 is provided, wherein the driving member 222 includes a horizontal slide groove 2221; the vibration rod 221 is connected to the horizontal slide groove 2221 via a slider disposed at one end away from the mold. During installation, the vibration rod 221 is installed by sliding one end of the vibration rod 221 with the slider into the horizontal slide groove 2221, and then inserting the other end into the first through hole 216. In other preferred embodiments, in order to lock the installed vibration rod 221 in position in the slide groove, a plurality of third through holes 2224 are disposed on the side of the horizontal slide groove 2221 away from the groove, and threaded blind holes 2223 are disposed at positions corresponding to the slider and the third through holes 2224. The position of the third through hole 2224 corresponds to the installation position of the vibration rod 221. When the vibration rod 221 slides into position in the slide slot, a bolt is passed through the third through hole 2224 and screwed into the threaded blind hole 2223 to lock the position of the vibration rod 221. It should be understood that in order to prevent the bolt head from being exposed on the surface of the horizontal slide slot 2221 after installation, it is considered to set the third through hole 2224 as a stepped through hole.

[0059] In some preferred embodiments, a specific example of the composition of the driving member 222 is also given, wherein the driving member 222 also includes a telescopic member 2222; the movable end of the telescopic member 2222 is connected to the horizontal slide 2221; and the driving device 3 provides power for the movement of the telescopic member 2222. The telescopic member 2222 can be any common telescopic structure, such as a hydraulic cylinder, a pneumatic cylinder, an electric cylinder or a mechanical telescopic structure, etc., which is not further limited in the present application, and those skilled in the art can determine the specific shape of the energy supply device according to the specific shape of the telescopic member 2222 in combination with conventional technology in the field. For example, when the telescopic member 2222 adopts a hydraulic cylinder, the energy supply device includes hydraulic pipes, hydraulic pumps, a liquid outlet box, a hydraulic valve, a hydraulic control system and other components. Furthermore, in order to adjust the telescopic amplitude of the telescopic member 2222 and thus adjust the vibration amplitude of the vibration rod 221, an amplitude adjustment device such as an adjustment nut commonly used in the field can also be provided.

[0060] The following description is given below with regard to the working process of the present invention:

[0061] The molten compound is extruded from the extruder and enters the flow channel 215 in the feed die 21 through the extruder connector 4. The cross-sectional size of the flow channel 215 is smaller than the discharge size of the extruder connector 4, so the molten compound converges in the flow channel 215, forming a higher pressure and tensile convergence effect. The vibration rod 221 extends into the flow channel 215 when the piston moves under the action of the driving member 222, directly contacts and acts on the molten compound, and directly acts on the molten compound with the vibration force, so that it is reciprocatedly compressed and released in the flow channel 215, and when the vibration rod 221 moves to the lowest end, the distance between the surface of the vibration rod 221 and the bottom surface of the flow channel 215 is small, forming a convergent flow channel 215, and strengthening the repeated tensile effect on the molten compound; with the reciprocating movement of the vibration rod 221, the molten polymer is repeatedly compressed, released, sheared and stretched. The flow channel 215 at the ultrasonic vibration head 232 is narrowed by the convergent boss 210, so that the flow channel 215 produces a convergent effect and increases the pressure of the molten compound, prolonging the action time of the ultrasonic wave on the molten compound. After the mechanical vibration and the ultrasonic wave act together, the molten compound enters the die 5 through the discharge end 214 and is formed into the required plastic product. The vibration action area of ​​the present application is large, has a strong vibration effect, and can not only provide a mechanical vibration stress field and an ultrasonic high-frequency stress field of compression release separately, but also provide a synergistic effect of the two stress fields, so as to achieve effective regulation and control of the processing performance of the polymer melt and efficient disentanglement.

[0062] Experimental example

[0063] This experimental example takes PLA (biodegradable plastic polylactic acid, polylactic acid) and LDPE (low-density polyethylene, Low Density Polyethylene) as examples to study the various properties of materials produced by the polymer melt composite vibration extrusion molding device of the present application.

[0064] like Figure 10-11 As shown in the figure, after the composite force field of ultrasound and mechanical vibration, the tensile strength of PLA is greatly improved, from 40MPa to 121MPa at most, with an increase of about 202.5%; the reason is that after the composite external force field treatment, the molecular chains are highly disentangled, forming a highly oriented state, and the crystallinity is higher and the crystals are more perfect, which greatly improves the mechanical properties of the continuously extruded splines. Fig.10In the figure, "0Hz" on the horizontal axis represents the material mechanical properties when both the vibration module and the high-frequency ultrasonic module 23 are not working; "4Hz" represents the material mechanical properties when the vibration frequency of the vibration module is 4Hz and the high-frequency ultrasonic module 23 is not working; "800W" represents the material mechanical properties when the vibration module is not working and the ultrasonic power is 800W; "4Hz-800W" represents the material mechanical properties when the vibration frequency of the vibration module is 4Hz and the ultrasonic power is 800W. Fig.11 In the figure, "0Hz" on the horizontal axis represents the material mechanical properties when both the vibration module and the high-frequency ultrasonic module 23 are not working; "0-960W" represents the material mechanical properties when the vibration module is not working and the ultrasonic power is 960W; "2-960W" represents the material mechanical properties when the vibration frequency of the vibration module is 2Hz and the ultrasonic power is 960W; "4-960W" represents the material mechanical properties when the vibration frequency of the vibration module is 4Hz and the ultrasonic power is 960W.

[0065] like Figure 12-Figure 15 As shown, after applying the ultrasonic and vibration composite force field, the melt pressure and apparent viscosity of PLA and LDPE when entering the die 5 both decreased significantly, indicating that the highly disentangled melt has excellent processing performance after composite external field treatment. The device can effectively increase the extrusion rate, reduce the die 5 pressure and melt viscosity, and continuously and efficiently extrude products with high mechanical properties.

[0066] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A polymer melt composite vibration extrusion molding device, characterized in that: It comprises a support (1), a composite vibration system (2), a driving device (3), an extruder connecting piece (4) and a die (5); The bracket (1) is used to fix and install the composite vibration system (2) and the driving device (3); The composite vibration system (2) comprises a feeding die (21), a medium and low frequency vibration module (22) and a high frequency ultrasonic module (23); The transfer mold (21) is composed of an upper mold (211) and a lower mold (212); a parting surface of the transfer mold (21) is provided with a flow channel (215) that runs through both ends of the transfer mold (21) and allows the polymer melt to flow; the upper mold (211) is provided with at least one first through hole (216), and the lower mold (212) is provided with at least one second through hole (217); the first through hole (216) and the second through hole (217) are respectively perpendicular to and connected to the flow channel (215); The medium and low frequency vibration module (22) comprises a vibration rod (221) and a driving member (222); the vibration rod (221) is installed in the first through hole (216) and extends into the flow channel (215); one end of the vibration rod (221) away from the upper mold (211) is connected to the driving member (222); the driving member (222) is used to drive the vibration rod (221) to perform piston movement in the first through hole (216); The high-frequency ultrasonic module (23) comprises an ultrasonic vibration head (232) and a horn (231); the ultrasonic vibration head (232) is arranged at one end of the horn (231); the horn (231) is installed in the second through hole (217) and the ultrasonic vibration head (232) extends into the flow channel (215); The driving device (3) is used to provide power for the driving member (222); The two ends of the flow channel (215) are respectively connected to the extruder connector (4) and the die (5), and a convergent boss (210) is also provided on the surface of the flow channel (215) facing the second through hole (217) to reduce the thickness of the flow channel (215) at this location.

2. The polymer melt composite vibration extrusion molding device according to claim 1, characterized in that: The parting surfaces of the upper mold (211) and the lower mold (212) are stepped.

3. The polymer melt composite vibration extrusion molding device according to claim 1, characterized in that: A wear-resistant sleeve (218) is arranged in the first through hole (216), the inner surface of the wear-resistant sleeve (218) is clearance-fitted with the vibration rod (221), and the outer surface is interference-fitted with the first through hole (216); a flexible sleeve (219) is arranged in the second through hole (217).

4. The polymer melt composite vibration extrusion molding device according to claim 1, characterized in that: The cross-sectional shape of the flow channel (215) is rectangular, and the width thereof is not less than the diameter of any one of the first through hole (216) and the second through hole (217).

5. The polymer melt composite vibration extrusion molding device according to claim 1, characterized in that: The driving member (222) comprises a horizontal slide groove (2221); the vibration rod (221) is connected to the horizontal slide groove (2221) via a sliding block arranged at an end away from the mold.

6. The polymer melt composite vibration extrusion molding device according to claim 5, characterized in that: A plurality of third through holes (2224) are arranged on one side of the horizontal sliding groove (2221) away from the groove, and threaded blind holes (2223) are arranged at positions of the sliding block corresponding to the third through holes (2224).

7. The polymer melt composite vibration extrusion molding device according to claim 5, characterized in that: The driving member (222) further comprises a telescopic member (2222); the movable end of the telescopic member (2222) is connected to the horizontal slide groove (2221); and the driving device (3) provides power for the movement of the telescopic member (2222).

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