CN115972533A - Polymer melt composite vibration extrusion molding device - Google Patents
Polymer melt composite vibration extrusion molding device Download PDFInfo
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- CN115972533A CN115972533A CN202211629499.3A CN202211629499A CN115972533A CN 115972533 A CN115972533 A CN 115972533A CN 202211629499 A CN202211629499 A CN 202211629499A CN 115972533 A CN115972533 A CN 115972533A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses a polymer melt composite vibration extrusion molding device, which comprises a composite vibration system, wherein the composite vibration system comprises a material passing die and a vibration system, the material passing die is formed by combining an upper die and a lower die, and a parting surface of the material passing die is provided with a flow channel which penetrates through two ends of the material passing 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 vertical to and communicated with the flow channel; the middle-low frequency vibration module comprises a vibration rod which is arranged in the first through hole and extends into the flow channel, and the driving piece drives the vibration rod to do piston motion in the first through hole; the high-frequency ultrasonic module comprises an ultrasonic vibration head arranged at one end of the amplitude transformer; the amplitude transformer is arranged in the second through hole, and the ultrasonic vibration head extends into the flow passage. The invention can obviously improve the processing performance of the polymer, and the composite vibration field can also change the microstructure form of the polymer, thereby improving the mechanical property, the thermal property and the like of the product and realizing the industrialized polymer melt extrusion production application.
Description
Technical Field
The invention relates to the field of polymer processing equipment, in particular to a polymer melt composite vibration extrusion molding device.
Background
The existing mainstream polymer melt composite vibration extrusion molding device can only provide a simple shearing field, and the generated shearing direction, shearing rate and the like are not changed. This simple shear field can cause the molecular chains between the layers of the fluidized bed to slip in a direction perpendicular to the direction of flow, thereby releasing the entanglement points to some extent, causing a phenomenon of viscosity reduction, known as "shear thinning". Although the viscosity reduction caused by shear thinning is beneficial to the processing process, the shear rate is constant and the shear time is short, when the recovery entanglement caused by the thermal motion of the molecular chain and the shear-induced disentanglement reach the dynamic balance, the entanglement state of the molecular chain is kept unchanged, the disentanglement cannot be continued, and the viscosity is also kept unchanged.
Chinese patent publication No. CN110815628A discloses a polymer melt disentangling device, which specifically discloses a polymer melt disentangling device that applies a circumferential rotation stress field or a circumferential vibration stress field or a composite motion stress field in which circumferential rotation and circumferential vibration are superimposed to a melt, so that molecular chains in the melt gradually move away in the circumferential shear field or the circumferential vibration field, especially in the composite stress field in which circumferential shear and circumferential vibration are superimposed, while the stress direction is constantly changed by one relaxation, thereby achieving a high disentangling effect. It has the following problems: 1. the disentanglement mode is single, mainly depends on a mechanical mode (vibration and shearing), and the disentanglement effect is limited; 2. the polymer melt enters the device in a direction different from that of the extrusion device, and an additional power device (a driving motor) is required to enable the polymer melt to flow and extrude in a specified direction.
The chinese patent publication No. CN114633448A discloses a testing machine with an integrated function of broadband amplitude vibration test/rheological measurement, and specifically discloses that a broadband amplitude vibration field is formed by simultaneously using high-amplitude low-frequency mechanical vibration and high-frequency low-amplitude ultrasonic vibration to improve the processing efficiency and mechanical properties of a polymer. However, it has the following disadvantages:
1. the material inlet, the material flow channel and the material outlet are vertical to each other, the flow direction of the polymer in the material flow channel needs to pass through 2 90-degree right angles, obviously, the right angles inevitably cause the flow speed of the polymer melt at the position to be slowed down, and the temperature to be reduced, but as the material flow channel is a test instrument, the material flow channel only needs to output the material at the material outlet, and even if the material flow property is poor or the temperature is low, the performance of the material flow channel is not influenced in the subsequent experiment, and the material flow channel is a great problem if the material flow channel is used in industrial production;
2. the mechanical vibration direction of the polymer melt reciprocating along the flow direction of the polymer melt is equivalent to that only a single-direction shear flow field is applied in the melt flow direction, the melt is in frictional shear with the wall surfaces of an upper die and a lower die, the shear field is consistent with the shear field in the conventional extrusion process in principle, only the melt is pushed by two sides to shear in a reciprocating manner, the effective disentanglement is difficult to realize by the shear field, and in the direction perpendicular to the flow direction, because of the speed difference between layers, macromolecules can slide relatively, so that the aggregation entanglement point and the topological entanglement point are both released to a certain degree, and the viscosity is reduced. The disentanglement is inevitable during the processing, but the disentanglement effect is general, and the deep disentanglement effect and the high-efficiency disentanglement effect cannot be achieved. On the other hand, the ultrasonic vibration head acts on the mould, but not directly acts on the polymer melt, so that the disentangling effect is weakened to a certain extent.
Disclosure of Invention
Aiming at the technical problems, the application provides a polymer melt composite vibration extrusion molding device which is simple in structure and suitable for industrial production and application and has medium and low frequency mechanical vibration and ultrasonic vibration.
In order to achieve the above object, the present application provides the following technical solutions:
a polymer melt composite vibration extrusion molding device comprises a bracket, a composite vibration system, a driving device, an extruder connecting piece and a neck mold;
the bracket is used for fixedly mounting the composite vibration system and the driving device;
the composite vibration system comprises a material passing mold, a medium-low frequency vibration module and a high-frequency ultrasonic module;
the material passing mold is formed by combining an upper mold and a lower mold, and a flow channel which penetrates through two ends of the material passing mold and is used for polymer melt to flow is arranged on a parting surface of the material passing mold; 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 vertical to and communicated with the flow channel;
the medium-low frequency vibration module comprises a vibration rod and a driving piece; the vibrating rod is arranged in the first through hole and extends into the flow channel, one end, far away from the upper die, of the vibrating rod is connected with a driving piece, and the driving piece is used for driving the vibrating rod to do piston motion in the first through hole;
the high-frequency ultrasonic module comprises an ultrasonic vibration head and an amplitude transformer; the ultrasonic vibration head is arranged at one end of the amplitude transformer; the amplitude transformer is arranged in the second through hole, and the ultrasonic vibration head extends into the flow channel.
The driving device is used for providing power for the driving piece;
and two ends of the flow channel are respectively connected with the extruder connecting piece and the mouth mold.
In some preferred embodiments, the parting surfaces of the upper and lower molds are stepped.
In some preferred embodiments, a convergent boss is further provided at a position of the flow passage surface facing the second through hole, for reducing the thickness of the flow passage at the position.
In some preferred embodiments, a wear-resistant sleeve is arranged in the first through hole, the inner surface of the wear-resistant sleeve is in clearance fit with the vibrating rod, and the outer surface of the wear-resistant sleeve is in interference fit with the first through hole; and a flexible sleeve is arranged in the second through hole.
In some preferred embodiments, the flow passage has a rectangular cross-sectional shape, and a width thereof is not smaller than a diameter of any one of the first through hole and the second through hole.
In some preferred embodiments, the drive member comprises a horizontal chute; the vibrating rod is connected with the horizontal sliding groove through a sliding block arranged at one end far away from the die.
In some preferred embodiments, one side of the horizontal sliding groove, which is far away from the slot, is provided with a plurality of third through holes, and the sliding block is provided with threaded blind holes at positions corresponding to the third through holes.
In some preferred embodiments, the drive member further comprises a telescoping member; the movable end of the telescopic piece is connected with the horizontal sliding groove; the driving device provides power for the movement of the telescopic piece.
Advantageous effects
1. The flow channel of the polymer melt is reasonable in design, the feed end of the flow channel can be connected with an extruder, the discharge end of the flow channel is connected with a port die, the viscosity of the polymer melt can be greatly reduced due to the superposition of high-frequency ultrasonic vibration and medium-low frequency vibration, the device can obviously improve the processability of the polymer, and the composite vibration field can also change the microstructure form of the polymer, so that the mechanical property, the thermal property and the like of a product are improved, and the industrial polymer melt extrusion production application is realized;
2. the continuous disentanglement molding of the polymer melt is realized through the composite external force field superposed by ultrasonic vibration and mechanical vibration, the viscosity of the melt can be greatly reduced, the extrusion processability of the polymer is improved, the pressure of a neck ring die is reduced, the extrusion flow rate is increased, the die-separation expansion is reduced, and the unstable flow of the melt is improved; can improve the crystallization perfection of the polymer, form an oriented structure, improve the distribution of the filler and greatly improve the mechanical property of an extruded product.
3. The macromolecule after chain disentanglement has higher movement capability, the ordering process of the system is accelerated, the crystallization capability of the polymer is enhanced, and the 'configuration' process of the polymer melt crystal form is easier to control and adjust, so that special crystal structures such as a crystal string structure and a column crystal structure can be generated under the induction of an external field or a nucleating agent, the crystallization perfection degree can be improved, an oriented structure is generated, and the physical and mechanical properties of the product are obviously improved.
Drawings
FIG. 1 is a schematic axial side view of a preferred embodiment of the present invention;
FIG. 2 is a schematic front view of a preferred embodiment of the present invention;
FIG. 3 is a schematic axial side view of a composite vibration system in a preferred embodiment of the present invention;
FIG. 4 is a schematic elevation view of a composite vibration system in a preferred embodiment of the present invention;
FIG. 5 is a schematic side view of a composite vibration system in accordance with a preferred embodiment of the present invention;
FIG. 6 is an enlarged schematic view of the main structure of section A-A inbase:Sub>A preferred embodiment of the present invention;
FIG. 7 isbase:Sub>A schematic view ofbase:Sub>A preferred embodiment of the present invention showingbase:Sub>A cross-section A-A ofbase:Sub>A flow die equipped with extruder attachment and die;
FIG. 8 is an enlarged schematic view of the cross-sectional structure A-A of the passing die inbase:Sub>A preferred embodiment of the present invention;
FIG. 9 is an enlarged schematic view of a cross-sectional structure B-B of a material passing mold in a preferred embodiment of the present invention;
FIG. 10 is a graph showing the results of mechanical properties of LDPE extrusion in a preferred experimental example of the present invention;
FIG. 11 is a diagram showing the results of the mechanical properties of PLA extrusion in a preferred example of the invention;
FIG. 12 is a first graphical representation of the LDPE extrusion processability results of a preferred experimental example of the present invention;
FIG. 13 is a second schematic diagram of the LDPE extrusion processability results of a preferred experimental example of the present invention;
FIG. 14 is a first graphical representation of PLA extrusion processability results in a preferred example of the invention;
FIG. 15 is a second schematic diagram of the PLA extrusion processability results of a preferred experimental example of the present invention;
in the figure: 1. a support; 2. a composite vibration system; 3. a drive device; 4. an extruder attachment; 5. a neck ring mold; 21. a material passing mold; 22. a medium-low frequency vibration module; 23. a high-frequency ultrasonic module; 210. a convergent boss; 211. an upper die; 212. a lower die; 213. a feeding end; 214. a discharge end; 215. a flow channel; 216. a first through hole; 217. a second through hole; 218. a wear-resistant sleeve; 219. a flexible sleeve; 221. a vibrating rod; 222. a drive member; 231. an amplitude transformer; 232. an ultrasonic vibration head; 2221. a horizontal chute; 2222. a telescoping member; 2223. a threaded blind hole; 2224. a third through hole;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The embodiment discloses a polymer melt composite vibration extrusion molding device, which comprises a bracket 1, a composite vibration system 2, a driving device 3, an extruder connecting piece 4 and a mouth mold 5, wherein the bracket 1 is shown in figures 1 to 9;
the bracket 1 is used for fixedly mounting the composite vibration system 2 and the driving device 3;
the composite vibration system 2 comprises a material passing mold 21, a medium-low frequency vibration module 22 and a high-frequency ultrasonic module 23;
the material passing mold 21 is formed by combining an upper mold 211 and a lower mold 212, and a runner 215 which penetrates through two ends of the material passing mold 21 and is used for polymer melt to flow is arranged on the parting surface of the material passing mold 21; 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 vertical to and communicated with the flow channel 215; in some preferred embodiments, in order to achieve more precise positioning of the upper and lower molds 212 when they are closed and to enable the material to overflow the flow channel 215 into the parting surface due to the higher pressure during extrusion, the parting surfaces of the upper mold 211 and the lower mold 212 are stepped, for example, with matching grooves and shoulders, to solve the above-mentioned problems. The cross-sectional size of the flow channel 215 is generally small, and in order to make the vibration module and the high-frequency ultrasonic module 23 contact the polymer melt in the flow channel 215 more sufficiently, it is considered to design the cross-sectional shape of the flow channel 215 to be rectangular, and the width of the flow channel is not less than the diameter of any one of the first through hole 216 and the second through hole 217.
The middle and low frequency vibration module 22 comprises a vibration rod 221 and a driving piece 222; the vibrating rod 221 is installed in the first through hole 216 and extends into the flow channel 215, one end of the vibrating rod 221, which is far away from the upper die 211, is connected with a driving member 222, and the driving member 222 is used for driving the vibrating rod 221 to perform piston motion in the first through hole 216; it should be understood that the vibrating rod 221 may be driven by a variety of driving methods, such as mechanical driving, electric driving, and hydraulic driving. In the present application, the vibration frequency of the vibration rod 221 is 0-200Hz and the vibration amplitude is 0-140mm, depending on the driving mode, and in practice, the vibration amplitude is sufficient, and generally not more than 10Hz.
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 amplitude transformer 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 device commonly used in the art, and includes necessary components such as an ultrasonic transmitter, a transducer, a cooling device, an ultrasonic generator, and an electric parameter device in addition to the ultrasonic vibration head 232 and the horn 231, so that the present application does not describe structures and components not directly related to the present technical solution. Since the ultrasonic vibration head 232 is inserted into the lower mold 212 from bottom to top in the present application, the horn 231 should be provided with a connecting device for connecting and fixing at a suitable position on the outer surface thereof, and in some preferred embodiments, may be a connecting flange; after the horn 231 is inserted in place, the horn 231 is fixedly connected to the lower mold 212 through the connecting flange. In other preferred embodiments, considering that the mold is generally a metal mold and the ultrasonic waves are not directly applied to the metal surface, a flexible sleeve 219 is disposed in the second through hole 217, the inner surface of the flexible sleeve 219 is in interference fit with the ultrasonic vibration head 232, and the outer surface of the flexible sleeve 219 is in transition fit with the second through hole 217. Preferably, the flexible sleeve 219 is a high temperature rubber.
The driving device 3 is used for providing power for the driving piece 222;
the two ends of the flow channel 215 are respectively connected with the extruder connecting piece 4 and the mouth mold 5. It should be understood that the extruder connection 4 and the die 5 are both removably connected, preferably flanged, to the flow die 21. The extruder connecting piece 4 is used for connecting a die and an extruder, the extruder can be any one of a double-screw extruder and a single-screw extruder commonly used in the field, and in order to realize industrial extrusion production, other necessary equipment such as a feeding device, a charging barrel, a preheating device, a cooling device, a traction device and the like are all equipped by the technical personnel in the field according to needs, and are not repeated as the equipment is not the key point of the invention.
In order to enhance the effect of the ultrasonic vibration head 232 on the polymer melt in the flow channel 215 and increase the penetration effect of the ultrasonic wave, it is also considered in some preferred embodiments that a converging boss 210 is further provided on the surface of the flow channel 215 opposite to the second through hole 217 for reducing the thickness of the flow channel 215 at this point, thereby achieving the following effects: 1. the higher pressure is facilitated to be established on the two sides of the convergence boss 210 in the flow channel 215, so that the vibration module can better shear and stretch the polymer melt; 2. the thickness of the polymer melt at this point is reduced so that the polymer melt can better receive the high-frequency vibration power field of ultrasonic waves, and the ultrasonic waves can play a better penetrating role so as to play a better disentanglement effect.
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 entanglement perpendicular to the shear direction is pulled apart, while the influence on the cohesive entanglement parallel to the shear direction is not great, and when the topological entanglement is located at one end of the molecular chain, the macromolecular chain is likely to slip apart in the shear force field, and when the entanglement is in the middle of the macromolecular, the entanglement is more and more pulled in the pure shear force field and is difficult to detach, resulting in a limited degree of melt disentanglement.
In a single ultrasonic vibration field, the cavitation effect of ultrasonic waves is reduced due to the high viscosity of polymer melt, the penetration capacity is limited, and the topological entanglement points can be loosened only by the single ultrasonic field under the condition of no shearing and stretching external fields, so that the relative slippage and disentanglement of molecular chains from the entanglement points are difficult to realize.
The design idea of the invention is that the ultra-high frequency impact is applied to the melt by using ultrasonic waves to instantly break the condensation entanglement in the melt, then the shear force field can enable molecular chains to gradually loosen from opened entanglement points and gradually pull apart under the action of a relaxation vibration field by combining with a high-frequency reciprocating vibration shear field, and the high disentanglement is realized.
Meanwhile, from the analysis of the intrinsic characteristics of molecular chain motion, the molecular weight of a high molecular chain has certain dispersibility and shows typical viscoelastic behavior characteristics, the response time of different molecular chains to an external field is inconsistent and is distributed in a time range (relaxation time spectrum), if the action of the external field changes at a certain moment, a part of the molecular chains can timely respond to the pace of changing with the external field, but the larger part of the molecular chains show different degrees of hysteresis and still move in the original mode, so that the motion conditions of all the molecular chains are different; the composite external fields combined with different movement forms can cause disturbance to the melt to the maximum extent, and are beneficial to opening entangled molecular chains.
In some preferred embodiments, a specific structural example is given of the connection between the vibration rod 221 and the driving member 222, and the driving member 222 includes a horizontal sliding groove 2221; the vibration rod 221 is connected to the horizontal sliding groove 2221 through a sliding block disposed at an end far from the mold. During installation, one end of the vibration rod 221 with the sliding block slides into the horizontal sliding groove 2221, and the other end is inserted into the first through hole 216, so that the installation of the vibration rod 221 can be completed. In other preferred embodiments, in order to lock the vibrating rod 221 installed in place in the sliding chute, a plurality of third through holes 2224 are formed in one side of the horizontal sliding chute 2221 away from the slot, and threaded blind holes 2223 are formed in positions of the sliding block corresponding to the third through holes 2224. The position of the third through hole 2224 corresponds to the installation position of the vibration rod 221, and after the vibration rod 221 slides in the sliding groove to a proper position, a bolt is screwed with the threaded blind hole 2223 through the third through hole 2224, so as to lock the position of the vibration rod 221. It should be understood that, in order to prevent the installed bolt head from being exposed to the surface of the horizontal sliding groove 2221, it is considered that the third through hole 2224 is provided as a stepped through hole.
In some preferred embodiments, a specific example of the driving member 222 is also provided, and the driving member 222 further comprises a telescopic member 2222; the movable end of the telescopic part 2222 is connected with the horizontal sliding groove 2221; the driving device 3 provides power for the movement of the telescopic member 2222. The telescopic part 2222 may be any common telescopic structure, such as a hydraulic cylinder, a pneumatic cylinder, an electric cylinder, or a mechanical telescopic structure, which is not further limited in this application, and a person skilled in the art may determine the specific form of the energy supply device according to the specific form of the telescopic part 2222 and the conventional technology in the art, for example, when the telescopic part 2222 is a hydraulic cylinder, the energy supply device includes a hydraulic pipe, a hydraulic pump, a liquid outlet tank, a hydraulic valve, a hydraulic control system, and other components. Furthermore, in order to adjust the expansion and contraction amplitude of the expansion and contraction member 2222 and further adjust the vibration amplitude of the vibration rod 221, an amplitude adjustment device such as an adjustment nut commonly used in the art may be further provided.
The working process of the present invention is explained as follows:
the molten compound is extruded from the extruder and passes through the extruder connecting piece 4 into the flow channel 215 in the feed die 21, the cross-sectional dimension of the flow channel 215 being smaller than the discharge dimension of the extruder connecting piece 4, so that the molten compound converges in the flow channel 215, resulting in a higher pressure and stretch convergence. 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 smaller to form a convergent flow channel 215, and the repeated stretching action of the molten compound is enhanced; as the vibration rod 221 reciprocates, the molten polymer is repeatedly compressed, released, and sheared and stretched. The flow channel 215 at the ultrasonic vibration head 232 is narrowed by the convergence boss 210, so that the flow channel 215 generates a convergence effect and increases the pressure of the molten compound, and the action time of the ultrasonic waves on the molten compound is prolonged. The molten compound, after the combined action of the mechanical vibration and the ultrasonic waves, enters the die 5 through the discharge end 214 and is molded into the desired plastic article. The application has the advantages that the vibration action area is large, the vibration action is strong, the mechanical vibration stress field and the ultrasonic high-frequency stress field which are released by compression can be provided independently, the synergistic effect of two stress fields can be provided, and the effective regulation and the efficient disentanglement of the processability of the polymer melt are realized.
Examples of the experiments
In the experimental example, PLA (biodegradable plastic polylactic acid) and LDPE (low density polyethylene) are taken as examples to study various properties of the material produced by the polymer melt composite vibration extrusion molding device.
As shown in fig. 10-11, after the composite force field of ultrasonic wave and mechanical vibration, the Tensile Strength (Tensile Strength) of PLA is greatly increased, which is increased from 40MPa to 121MPa at most, and the increase is about 202.5%; the reason is that the molecular chains are highly disentangled after the treatment of the composite external force field, a highly oriented state is formed, the crystallinity is higher, the crystals are more complete, and the mechanical property of the continuously extruded sample strips is greatly improved. In fig. 5, "0Hz" on the abscissa represents the mechanical properties of the material when neither the vibration module nor the high-frequency ultrasonic module 23 is in operation; "4Hz" represents the material mechanical property of the vibration module when the vibration frequency is 4Hz and the high-frequency ultrasonic module 23 does not work; 800W represents the mechanical property of the material when the vibration module does not work and the ultrasonic power is 800W; "4Hz-800W" represents the material mechanical property of the vibration module with vibration frequency of 4Hz and ultrasonic power of 800W. In fig. 6, "0Hz" on the abscissa represents the mechanical properties of the material when neither the vibration module nor the high-frequency ultrasonic module 23 is in operation; 0-960W represents the mechanical property of the material when the vibration module does not work and the ultrasonic power is 960W; the '2-960W' represents the mechanical property of the material when the vibration frequency of the vibration module is 2Hz and the ultrasonic power is 960W; "4-960W" represents the mechanical property of the material when the vibration frequency of the vibration module is 4Hz and the ultrasonic power is 960W.
As shown in fig. 12-fig. 15, after the ultrasonic and vibration composite force field is applied, the melt pressure and apparent viscosity of PLA and LDPE entering the neck ring mold 5 are both significantly reduced, which indicates that the melt processed by the composite external field with high disentanglement has excellent processability, and the device can effectively increase the extrusion rate, reduce the pressure and melt viscosity of the neck ring mold 5, and continuously and efficiently extrude the product with high mechanical properties.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The polymer melt compound vibration extrusion molding device is characterized in that: comprises a bracket (1), a composite vibration system (2), a driving device (3), an extruder connecting piece (4) and a mouth mold (5);
the bracket (1) is used for fixedly mounting the composite vibration system (2) and the driving device (3);
the composite vibration system (2) comprises a material passing mold (21), a medium-low frequency vibration module (22) and a high-frequency ultrasonic module (23);
the material passing mold (21) is formed by combining an upper mold (211) and a lower mold (212), and a runner (215) which penetrates through two ends of the material passing mold (21) and is used for polymer melt to flow is arranged on a parting surface of the material passing mold (21); 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 vertical to and communicated with the flow channel (215);
the medium-low frequency vibration module (22) comprises a vibration rod (221) and a driving piece (222); the vibrating rod (221) is installed in the first through hole (216) and extends into the flow channel (215), one end, far away from the upper die (211), of the vibrating rod (221) is connected with a driving piece (222), and the driving piece (222) is used for driving the vibrating rod (221) to do piston motion in the first through hole (216);
the high-frequency ultrasonic module (23) comprises an ultrasonic vibration head (232) and a variable amplitude rod (231); the ultrasonic vibration head (232) is arranged at one end of the amplitude transformer (231); the amplitude transformer (231) is arranged in the second through hole (217) and the ultrasonic vibration head (232) extends into the flow channel (215).
The driving device (3) is used for providing power for the driving piece (222);
and two ends of the flow channel (215) are respectively connected with the extruder connecting piece (4) and the mouth mold (5).
2. The polymer melt composite vibration extrusion molding apparatus according to claim 1, wherein: the parting surfaces of the upper die (211) and the lower die (212) are in a step shape.
3. The polymer melt composite vibration extrusion molding apparatus according to claim 1, wherein: and a convergent boss (210) is further arranged at the position, facing the second through hole (217), of the surface of the flow channel (215) and is used for reducing the thickness of the flow channel (215) at the position.
4. The polymer melt composite vibration extrusion molding apparatus according to claim 1, wherein: a wear-resistant sleeve (218) is arranged in the first through hole (216), the inner surface of the wear-resistant sleeve (218) is in clearance fit with the vibrating rod (221), and the outer surface of the wear-resistant sleeve (218) is in interference fit with the first through hole (216); a flexible sleeve (219) is arranged in the second through hole (217).
5. The polymer melt composite vibration extrusion molding apparatus according to claim 1, wherein: the cross section of the flow channel (215) is rectangular, and the width of the flow channel is not less than the diameter of any one of the first through hole (216) and the second through hole (217).
6. The polymer melt composite vibration extrusion molding apparatus according to claim 1, wherein: the drive (222) comprises a horizontal chute (2221); the vibrating rod (221) is connected with the horizontal sliding groove (2221) through a sliding block arranged at one end far away from the die.
7. The polymer melt composite vibration extrusion molding apparatus according to claim 6, wherein: one side of the horizontal sliding groove (2221) far away from the open groove is provided with a plurality of third through holes (2224), and threaded blind holes (2223) are formed in the positions, corresponding to the third through holes (2224), of the sliding block.
8. The polymer melt composite vibration extrusion molding apparatus according to claim 6, wherein: the drive member (222) further comprises a telescopic member (2222); the movable end of the telescopic part (2222) is connected with the horizontal sliding groove (2221); the driving device (3) provides power for the movement of the telescopic part (2222).
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| CN115972478A (en) * | 2022-12-19 | 2023-04-18 | 四川大学 | Polymer melt composite vibration injection molding device |
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