CN115157591B - Alternating stretching mixing element and method - Google Patents
Alternating stretching mixing element and method Download PDFInfo
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- CN115157591B CN115157591B CN202210704176.XA CN202210704176A CN115157591B CN 115157591 B CN115157591 B CN 115157591B CN 202210704176 A CN202210704176 A CN 202210704176A CN 115157591 B CN115157591 B CN 115157591B
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- 238000002156 mixing Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 47
- 239000000155 melt Substances 0.000 claims abstract description 33
- 239000011159 matrix material Substances 0.000 claims abstract description 22
- 230000003247 decreasing effect Effects 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims description 36
- 239000000289 melt material Substances 0.000 claims description 23
- 229920000642 polymer Polymers 0.000 claims description 15
- 230000007704 transition Effects 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 3
- 238000004898 kneading Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 16
- 238000012545 processing Methods 0.000 abstract description 16
- 239000006185 dispersion Substances 0.000 abstract description 12
- 238000010008 shearing Methods 0.000 abstract description 8
- 238000009826 distribution Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 238000005728 strengthening Methods 0.000 abstract description 3
- 238000001746 injection moulding Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 239000000306 component Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 101100334009 Caenorhabditis elegans rib-2 gene Proteins 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004595 color masterbatch Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/58—Details
- B29C45/60—Screws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/58—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/565—Screws having projections other than the thread, e.g. pins
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model discloses an alternating stretching mixing element and a method; the different curved surface convergence ribs are uniformly arranged in the central area of the surface of the drum-shaped matrix along the circumferential direction; two side surfaces of the converging convex rib with different curved surfaces are respectively a male surface and a female surface; when the positive faces of two adjacent different curved surface convergence convex edges are opposite, the single convergence flow channel is formed; when the concave surfaces of two adjacent different curved surface convergence convex edges are opposite, the axial secondary convergence flow channel is formed; the curvature radius of the outer surface of the drum-shaped matrix is firstly increased and then decreased, so that the sizes of the melt which enters the axial single convergence flow channel and the axial secondary convergence flow channel in the direction perpendicular to the flow direction of the melt are firstly decreased and then increased. The utility model is based on the plasticizing mixing process taking the stretching flow field as the leading, and is provided with a multi-dimensional and alternating convergent flow channel, thereby having the advantages of strengthening the dispersion distribution mixing effect and plasticizing effect, improving the processing energy efficiency, avoiding the large temperature rise caused by strong shearing, being convenient to assemble and disassemble, and the like, and widening the adaptability of the material and processing equipment.
Description
Technical Field
The utility model relates to the technical field of polymer molding processing, in particular to an alternating stretching mixing element and a method.
Background
Injection molding can efficiently produce polymer material products with complex surfaces or structures. Because most of the raw materials for injection molding are multiphase multicomponent systems containing various functional solid fillers, such as cross-linking agents, plasticizers, foaming agents, stabilizers, conductive fillers, color master batches and the like, the high requirements are put forward on a screw which is a core component of a plasticizing system of injection molding processing equipment. The kneading plasticizing capacity of the screw affects the final properties of the product and the cost of production.
To obtain a multi-phase multi-component polymer composite system modified material with the expected function, each component needs to be dispersed and distributed in a polymer matrix in a relatively uniform way according to a certain particle size. The two flow fields for realizing the mixing effect are a shearing flow field and a stretching flow field, which often coexist in a compound way. The traditional screw element or equipment taking the shear flow field as the dominant one is used for plasticizing the formed polymer by providing strong shearing action, and the excessive shearing action often generates a large amount of viscous heat dissipation, has limited dispersion and mixing effects on a multiphase multicomponent system, easily causes the chain breakage of a molecular chain to degrade due to the overlong thermo-mechanical process of the material, has larger melt temperature rise amplitude, and is unfavorable for the temperature control and thermal energy management of the whole forming process, so that the mixing plasticizing device of the high polymer material is needed to break through the limitation of the traditional screw for improvement. At present, a great deal of research shows that the tensile flow field can provide about twice as much force as the shearing flow field under the same deformation rate to realize the breaking of solid agglomerated particles, has higher dispersion efficiency and stronger dispersion capability, and has low processing temperature rise, low energy consumption and little degradation.
The Chinese patent application CN107471537A discloses a screw mixing element for an injection molding machine, which is introduced into a stretching flow field, and mainly introduces a stretching flow channel through a special structure with trapezoidal threads and tapered threads which are alternately arranged, so that materials are forced to undergo repeated shearing stretching actions to realize quick plasticization, the mixing effect is improved, and a flow dead zone is easily generated in the structure.
The utility model patent No. CN211279618 proposes a mixing element assembled based on an embedded half cylinder and provided with stretching holes, and the dispersing and mixing effects of the polymer are enhanced by arranging a series of stretching holes and separating edges, but the structure is complex.
However, optimization for the whole forming and processing equipment is often long in modification period and high in cost, and is mainly oriented to laboratory research needs.
Therefore, in the technical field of polymer molding processing, how to construct a plasticizing unit with low energy consumption, low temperature rise and high mixing, which can be applied to large-scale industrial production is still needed to be studied.
Disclosure of Invention
The present utility model aims to overcome the disadvantages and shortcomings of the prior art described above and to provide an alternating stretch mixing element and method. It has excellent mixing and mixing effects aiming at a multi-component polymer composite system, can effectively reduce the temperature rise amplitude in the plasticizing processing process, good heat energy management is realized, and meanwhile, the degradation and processing energy consumption of a molecular chain are reduced, so that the material has wider material adaptability.
The utility model is realized by the following technical scheme:
an alternating tensile mixing element comprising a barrel 18 and a tensile element matrix therein; the stretching element substrate is a drum-shaped substrate 1;
a plurality of converging convex edges 2 with different curved surfaces are uniformly arranged in the central area of the surface of the drum-shaped substrate 1 along the circumferential direction;
two side surfaces of the convergence rib 2 with different curved surfaces are respectively a male surface 7 and a female surface 8;
when the male faces 7 of two adjacent different curved surface convergence ribs 2 are opposite, the gaps between the two adjacent different curved surface convergence ribs form a plurality of groups of axial single convergence flow passages 5;
when the female surfaces 8 of two adjacent different curved surface convergence ribs 2 are opposite, a plurality of groups of axial secondary convergence flow passages 4 are formed by the gap;
a plurality of guide ribs 3 are respectively arranged at the two end surfaces of the drum-shaped matrix 1; a plurality of guide passages 6 are formed between the guide rib side surfaces 9 of the guide ribs 3; the space between the material guiding edge 3 and the converging convex edge 2 with different curved surfaces forms a transition flow passage 10;
the curvature radius of the outer surface 12 of the drum-shaped matrix 1 is firstly increased and then decreased, so that the sizes of the melt which enters the axial single convergence flow channel 5 and the axial secondary convergence flow channel 4 in the direction perpendicular to the flow direction of the melt are firstly decreased and then increased gradually, namely the melt is firstly converged and thinned in the radial direction of the drum-shaped matrix 1, and then dispersed and thickened.
The profile curve of the male surface 7 of the converging convex edge 2 with different curved surfaces is an elliptic curve; the major axis of the elliptic curve is parallel to the drum base 1 axis.
The profile curve of the concave surface 8 of the convergence convex edge 2 with different curved surfaces is a wavy curve with the curvature periodically changed; the two sides of the wavy curve are respectively tangent to the corresponding elliptical curve of the male surface 7.
The wavy curve is an axisymmetric curve; the symmetry axis of the axisymmetric curve is a straight line where the minor axis of the elliptical curve of the male surface 7 is located;
the curvature radius of the wavy curve continuously changes along the axial direction of the drum-shaped substrate 1, at least one curvature radius extreme point is arranged on each of two sides of the symmetry axis, and the symmetry axis is a curvature radius extreme point to form at least two converging-diverging flow passages, so that the melt materials are repeatedly subjected to stretching and crushing.
The axial section of the guide rib 3 is arched, so that the melt can flow forwards; the included angles between the adjacent guide ribs 3 are 18 degrees, and the phases of the two groups of guide ribs at the end surfaces are aligned periodically.
The top surface of the guide rib 3 is a plane or a spherical surface with constant curvature or gradually increased curvature;
when spherical surfaces are used, a plurality of circumferential secondary convergent flow passages 14 are formed between the top surface 16 of the guide rib 3 and the connecting surface 15 and the inner surface 13 of the barrel 18; the circumferential secondary converging channel 14 serves to enhance turbulence in the flow of melt into and out of the drum base 1.
The radius of curvature of the outer surface 12 of the drum base 1 gradually increases and decreases in the axial direction at a rate of change.
The compression ratio range of the axial single convergence flow passage 5 is 4:1 to 5:1, a step of; the compression ratio range of the axial secondary convergence flow passage 4 is 2:1 to 3:1.
the material guiding passage 6 is arranged in staggered arrangement with each axial single convergence flow passage 5 and each axial secondary convergence flow passage 4, so that the melt is dispersed and converged for a plurality of times.
The number of the different curved surface convergence ribs 2 is even and at least four, so that the number of the axial single convergence flow passages 5 is consistent with that of the axial secondary convergence flow passages 4; the number of the material guiding edges 3 on the two end surfaces of the drum-shaped substrate 1 is consistent with that of the converging convex edges 2 with different curved surfaces, namely, the number of the material guiding passages 6 is consistent with that of the axial single converging flow passages 5 and the axial secondary converging flow passages 4, so that the melt flows in and flows out at least once in a dispersing and converging way.
The different curved surface convergence ribs 2 are completely the same; the heights of the guide ribs 3 are consistent with those of the converging ribs 2 with different curved surfaces.
The drum-shaped matrix 1 is provided with a connecting hole at the core part, so that the connecting hole is convenient to position and assemble with the screw mandrel 17.
A polymer melt stretching and mixing method comprises the following implementation steps:
during operation, molten melt materials are disturbed by a material guiding edge 3 at one side end surface of a drum-shaped substrate 1 and are divided into a plurality of material flows, and the material flows firstly enter a transition flow passage 10 at the upstream position and then enter an axial single convergence flow passage 5 and an axial secondary convergence flow passage 4 which are formed by a plurality of different curved convergence ribs 2;
when the melt material passes through the axial single convergence flow passage 5, the melt material is gradually converged and then gradually diverged, then flows into the downstream transition flow passage 10, and is disturbed and divided into a plurality of material flows by the material guiding edges 3 on the other side end surface of the drum-shaped substrate 1 until the next working procedure is carried out;
when the melt material passes through the axial secondary convergence flow channel 4, the melt material is gradually converged, then gradually diverged, gradually converged and gradually diverged again, so that the melt material is repeatedly stretched and broken, then flows into the downstream transition flow channel 10, and is disturbed and divided into a plurality of material flows by the material guiding edges 3 on the other side end surface of the drum-shaped substrate 1 until the next working procedure is carried out;
when the melt material passes through the axial single convergence flow channel 5 and the axial secondary convergence flow channel 4, the curvature radius of the outer surface 12 of the drum-shaped substrate 1 is firstly increased and then decreased, so that the sizes of the melt entering the axial single convergence flow channel 5 and the axial secondary convergence flow channel 4 in the direction perpendicular to the flow direction of the melt are firstly gradually decreased and then gradually increased, namely the melt is firstly converged and thinned in the radial direction of the drum-shaped substrate 1, and then dispersed and thickened.
Compared with the prior art, the utility model has the following advantages and effects:
the stretching element matrix is a drum matrix 1; a plurality of converging convex edges 2 with different curved surfaces are uniformly arranged in the central area of the surface of the drum-shaped substrate 1 along the circumferential direction; two side surfaces of the convergence rib 2 with different curved surfaces are respectively a male surface 7 and a female surface 8; when the male faces 7 of two adjacent different curved surface convergence ribs 2 are opposite, the gaps between the two adjacent different curved surface convergence ribs form a plurality of groups of axial single convergence flow passages 5; when the female surfaces 8 of two adjacent different curved surface convergence ribs 2 are opposite, a plurality of groups of axial secondary convergence flow passages 4 are formed by the gap; a plurality of guide ribs 3 are respectively arranged at the two end surfaces of the drum-shaped matrix 1; a plurality of guide passages 6 are formed between the guide rib side surfaces 9 of the guide ribs 3; the space between the material guiding edge 3 and the converging convex edge 2 with different curved surfaces forms a transition flow passage 10; the curvature radius of the outer surface 12 of the drum-shaped matrix 1 is firstly increased and then decreased, so that the sizes of the melt which enters the axial single convergence flow channel 5 and the axial secondary convergence flow channel 4 in the direction perpendicular to the flow direction of the melt are firstly decreased and then increased gradually, namely the melt is firstly converged and thinned in the radial direction of the drum-shaped matrix 1, and then dispersed and thickened.
The utility model has the characteristics that the dispersion distribution mixing and plasticizing forming process taking the stretching flow field as the dominant is realized. Compared with the traditional processing mode with the shear flow field as the dominant mode, the method has higher dispersion efficiency and stronger dispersion capacity; the processing temperature rise range is small, the degradation of molecular chains is effectively prevented, the temperature is only increased by 1-3 ℃, and the material adaptability is widened; the processing energy consumption is low, and the cost is saved.
The converging flow passage has the outstanding characteristics of alternating type and multi-dimension. An axial convergence flow passage in the vertical direction is formed between the outer surface of the drum-shaped substrate and the inner surface of the screw barrel; meanwhile, the identical surfaces of a plurality of different curved surface convergence ribs are arranged oppositely, and a plurality of groups of single-secondary alternating axial convergence flow channels are formed along the circumferential direction; in addition, a plurality of circumferential secondary convergence flow passages are formed between a plurality of guide ribs at two end surfaces of the drum-shaped base body and the inner surface of the screw barrel. Therefore, the materials flowing into the mixing element are repeatedly subjected to homogenization, confluence and stretching, so that the dispersion, distribution, mixing and plasticizing effects of the materials are improved.
The mixing element provided by the utility model can be assembled on a screw mandrel of molding equipment such as an extruder, an injection molding machine and the like to construct a multifunctional plasticizing system, and the application and the operation are simple and convenient, and the application range is wider.
The utility model is based on the plasticizing and mixing process taking the stretching flow field as the main part, is provided with a multi-dimensional and alternating convergent flow channel, has the advantages of strengthening the dispersion distribution mixing effect and the plasticizing effect, improving the processing energy efficiency, avoiding the large temperature rise caused by strong shearing, being convenient to assemble and disassemble and the like, and widens the adaptability of the material and processing equipment.
Drawings
FIG. 1 is a schematic perspective view of an alternating tensile kneading element of the present utility model.
FIG. 2 is a schematic illustration of an alternate stretch mixing member and barrel assembly according to the present utility model.
Fig. 3 is a cross-sectional view of fig. 2 taken along the direction A-A.
FIG. 4 is a schematic perspective view of another alternative construction of an alternative stretch mixing member of the present utility model.
FIG. 5 is a schematic view of the assembly of the alternating stretch mixing member and barrel of FIG. 4.
Fig. 6 is an enlarged partial schematic view of fig. 5 a.
FIG. 7 is a schematic perspective view of an exemplary alternating tensile mixing element of the present utility model in combination with a screw.
Detailed Description
The present utility model will be described in further detail with reference to specific examples.
The utility model discloses an alternating stretching and mixing element, which comprises a charging barrel 18 and a stretching element matrix therein; the stretching element substrate is a drum-shaped substrate 1;
a plurality of converging convex edges 2 with different curved surfaces are uniformly arranged in the central area of the surface of the drum-shaped substrate 1 along the circumferential direction;
two side surfaces of the convergence rib 2 with different curved surfaces are respectively a male surface 7 and a female surface 8;
when the male faces 7 of two adjacent different curved surface convergence ribs 2 are opposite, the gaps between the two adjacent different curved surface convergence ribs form a plurality of groups of axial single convergence flow passages 5;
when the female surfaces 8 of two adjacent different curved surface convergence ribs 2 are opposite, a plurality of groups of axial secondary convergence flow passages 4 are formed by the gap;
a plurality of guide ribs 3 are respectively arranged at the two end surfaces of the drum-shaped matrix 1; a plurality of guide passages 6 are formed among the guide rib side surfaces 9 of each guide rib 3 so as to quickly divide the flowing polymer melt and increase the disturbance and exchange of the polymer melt in the transition flow passage; the space between the material guiding edge 3 and the converging convex edge 2 with different curved surfaces forms a transition flow passage 10;
the curvature radius of the outer surface 12 of the drum-shaped matrix 1 is firstly increased and then decreased, so that the sizes of the melt which enters the axial single convergence flow channel 5 and the axial secondary convergence flow channel 4 in the direction vertical to the flow direction of the melt are firstly decreased gradually and then increased gradually, namely the melt is firstly converged and thinned in the radial direction of the drum-shaped matrix 1, and then dispersed and thickened, so that the effective crushing and thinning of large-size disperse phases are realized.
The profile curve of the male surface 7 of the converging convex edge 2 with different curved surfaces is an elliptic curve; the major axis of the elliptic curve is parallel to the drum base 1 axis.
The profile curve of the concave surface 8 of the convergence convex edge 2 with different curved surfaces is a wavy curve with the curvature periodically changed; the two sides of the wavy curve are respectively tangent to the corresponding elliptical curve of the male surface 7.
The wavy curve is an axisymmetric curve; the symmetry axis of the axisymmetric curve is a straight line where the minor axis of the elliptical curve of the male surface 7 is located;
the curvature radius of the wavy curve continuously changes along the axial direction of the drum-shaped substrate 1, at least one curvature radius extreme point is arranged on each of two sides of the symmetry axis, and the symmetry axis is a curvature radius extreme point to form at least two converging-diverging flow passages, so that the melt materials are repeatedly subjected to stretching and crushing.
The axial section of the guide rib 3 is arched, so that the melt can flow forwards; the included angles between the adjacent guide ribs 3 are 18 degrees, and the phases of the two groups of guide ribs at the end surfaces are aligned periodically.
The top surface of the guide rib 3 is a plane or a spherical surface with constant curvature or gradually increased curvature;
when spherical surfaces are used, a plurality of circumferential secondary convergent flow passages 14 are formed between the top surface 16 of the guide rib 3 and the connecting surface 15 and the inner surface 13 of the barrel 18; the circumferential secondary converging channel 14 serves to enhance turbulence in the flow of melt into and out of the drum base 1.
The radius of curvature of the outer surface 12 of the drum base 1 gradually increases and decreases in the axial direction at a rate of change.
The compression ratio range of the axial single convergence flow passage 5 is 4:1 to 5:1, a step of; the compression ratio range of the axial secondary convergence flow passage 4 is 2:1 to 3:1, a step of; the material guide passage 6 is staggered with each axial single convergence flow passage 5 and each axial secondary convergence flow passage 4, so that the melt is dispersed and converged for multiple times, the polymer melt is forced to undergo multiple dispersion and convergence actions, and the mass and heat transfer effect is enhanced. The structure forms a multi-dimensional convergent flow passage for material flow, and the material flow is subjected to stronger homogenization, confluence and stretching effects, so that the dispersion distribution mixing and plasticizing effects are further improved.
The number of the different curved surface convergence ribs 2 is even and at least four, so that the number of the axial single convergence flow passages 5 is consistent with that of the axial secondary convergence flow passages 4; the number of the material guiding edges 3 on the two end surfaces of the drum-shaped substrate 1 is consistent with the number of the convergence ribs 2 with different curved surfaces, namely the material guiding passage 6 is consistent with the total number of the axial single convergence flow passage 5 and the axial secondary convergence flow passage 4, so that the melt flows in and flows out at least once in a dispersing and converging way.
The different curved surface convergence ribs 2 are completely the same; the height of the guide ribs 3 is consistent with that of the converging ribs 2 with different curved surfaces, and the clearance between the guide ribs and the inner surface of the charging barrel 18 is about 0.25mm.
In practical application, the core of the drum-shaped matrix 1 is provided with a connecting hole, so that the drum-shaped matrix is convenient to position and assemble with other components, such as the screw mandrel 17.
The polymer melt stretching and mixing method can be realized by the following steps:
during operation, molten melt materials are disturbed by a material guiding edge 3 at one side end surface of a drum-shaped substrate 1 and are divided into a plurality of material flows, and the material flows firstly enter a transition flow passage 10 at the upstream position and then enter an axial single convergence flow passage 5 and an axial secondary convergence flow passage 4 which are formed by a plurality of different curved convergence ribs 2;
when the melt material passes through the axial single convergence flow passage 5, the melt material is gradually converged and then gradually diverged, then flows into the downstream transition flow passage 10, and is disturbed and divided into a plurality of material flows by the material guiding edges 3 on the other side end surface of the drum-shaped substrate 1 until the next working procedure is carried out;
when the melt material passes through the axial secondary convergence flow channel 4, the melt material is gradually converged, then gradually diverged, gradually converged and gradually diverged again, so that the melt material is repeatedly stretched and broken, then flows into the downstream transition flow channel 10, and is disturbed and divided into a plurality of material flows by the material guiding edges 3 on the other side end surface of the drum-shaped substrate 1 until the next working procedure is carried out;
when the melt material passes through the axial single convergence flow channel 5 and the axial secondary convergence flow channel 4, the curvature radius of the outer surface 12 of the drum-shaped substrate 1 is firstly increased and then decreased, so that the sizes of the melt entering the axial single convergence flow channel 5 and the axial secondary convergence flow channel 4 in the direction perpendicular to the flow direction of the melt are firstly gradually decreased and then gradually increased, namely the melt is firstly converged and thinned in the radial direction of the drum-shaped substrate 1, and then dispersed and thickened.
The utility model is based on the plasticizing mixing process taking the stretching flow field as the leading, and is provided with a multi-dimensional and alternating convergent flow channel, thereby having the advantages of strengthening the dispersion distribution mixing effect and plasticizing effect, improving the processing energy efficiency, avoiding the large temperature rise caused by strong shearing, being convenient to assemble and disassemble, and the like, and widening the adaptability of the material and processing equipment.
As described above, the present utility model can be preferably realized.
The embodiments of the present utility model are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the utility model should be made and equivalents should be construed as falling within the scope of the utility model.
Claims (2)
1. A polymer melt stretching and mixing method is characterized in that an alternating stretching and mixing element is adopted;
the alternating tensile mixing element comprises a barrel (18) and a tensile element matrix therein; the stretching element substrate is a drum-shaped substrate (1);
a plurality of converging ribs (2) with different curved surfaces are uniformly arranged in the central area of the surface of the drum-shaped substrate (1) along the circumferential direction;
two side surfaces of the convergence rib (2) with different curved surfaces are respectively a male surface (7) and a female surface (8);
when the male faces (7) of two adjacent different curved surface convergence ribs (2) are opposite, the gaps between the two adjacent curved surface convergence ribs form a plurality of groups of axial single convergence flow passages (5);
when the female surfaces (8) of two adjacent different curved surface convergence ribs (2) are opposite, a plurality of groups of axial secondary convergence flow passages (4) are formed in the gap;
a plurality of material guiding edges (3) are respectively arranged at the two end surfaces of the drum-shaped substrate (1); a plurality of guide passages (6) are formed between the guide edge side surfaces (9) of the guide edges (3); the space between the material guiding edge (3) and the convergence rib (2) with different curved surfaces forms a transition flow passage (10);
the curvature radius of the outer surface (12) of the drum-shaped matrix (1) is firstly increased and then decreased, so that the sizes of the melt which enters the axial single convergence flow channel (5) and the axial secondary convergence flow channel (4) in the direction perpendicular to the flow direction of the melt are firstly gradually decreased and then gradually increased, namely the melt is firstly converged and thinned in the radial direction of the drum-shaped matrix (1) and then dispersed and thickened;
the profile curve of the male surface (7) of the converging convex edge (2) with different curved surfaces is an elliptic curve; the long axis of the elliptic curve is parallel to the axis of the drum-shaped substrate (1);
the profile curve of the concave surface (8) of the convergence convex edge (2) with different curved surfaces is a wavy curve with the curvature periodically changed; both sides of the wavy curve are tangent to the elliptic curve of the corresponding male surface (7) respectively;
the wavy curve is an axisymmetric curve; the symmetry axis of the axisymmetric curve is a straight line where the minor axis of the elliptic curve of the male surface (7) is located;
the curvature radius of the wavy curve continuously changes along the axial direction of the drum-shaped substrate (1), and at least one curvature radius extreme point is respectively arranged on two sides of the symmetrical axis;
the compression ratio range of the axial single convergence runner (5) is 4:1 to 5:1, a step of; the compression ratio range of the axial secondary convergence runner (4) is 2:1 to 3:1, a step of;
the material guide passage (6) is staggered with each axial single convergence flow passage (5) and each axial secondary convergence flow passage (4) to ensure that the melt is dispersed and converged for a plurality of times;
the number of the different curved surface convergence ribs (2) is even and at least four, so that the number of the axial single convergence flow channels (5) is consistent with that of the axial secondary convergence flow channels (4); the number of the guide ribs (3) on the two end surfaces of the drum-shaped substrate (1) is consistent with the number of the convergence ribs (2) with different curved surfaces, namely, the total number of the guide passages (6) is consistent with the total number of the axial single convergence flow passage (5) and the axial secondary convergence flow passage (4), so that the melt flows in and flows out at least once in a dispersing and converging way;
the axial section of the guide rib (3) is arched, so that the melt can flow forwards; the included angles between the adjacent material guiding edges (3) are 18 degrees;
the top surface of the material guiding edge (3) is a plane or a spherical surface with constant curvature or gradually increased curvature;
when a spherical surface is adopted, a plurality of circumferential secondary convergence flow passages (14) are formed between the top surface (16) of the guide rib (3) and the connecting surface (15) and the inner surface (13) of the feed cylinder (18); the circumferential secondary converging channel (14) is used for enhancing the disturbance of the melt flowing into and out of the drum-shaped substrate (1);
the polymer melt stretching and mixing steps are as follows:
during operation, molten melt materials are disturbed and divided into a plurality of material flows through a material guiding edge (3) on one side end surface of a drum-shaped substrate (1), and enter an upstream transition flow channel (10) firstly, and then enter an axial single convergence flow channel (5) and an axial secondary convergence flow channel (4) which are formed by a plurality of different curved convergence ribs (2);
when the melt material passes through the axial single convergence flow channel (5), the melt material is gradually converged, then gradually diverged, then flows into a transition flow channel (10) at the downstream position, and is disturbed and divided into a plurality of material flows by a material guiding edge (3) at the end surface at the other side of the drum-shaped substrate (1) until the next working procedure is carried out;
when the melt material passes through the axial secondary convergence flow channel (4), the melt material is gradually converged, then gradually diverged, gradually converged and then gradually diverged again, so that the melt material is repeatedly stretched and broken and then flows into the downstream transition flow channel (10), and then is disturbed and divided into a plurality of material flows by the material guiding edges (3) on the end surface on the other side of the drum-shaped substrate (1) until the next working procedure is carried out;
when the melt material passes through the axial single convergence flow channel (5) and the axial secondary convergence flow channel (4), as the curvature radius of the outer surface (12) of the drum-shaped substrate (1) is firstly increased and then decreased, the size of the melt entering the axial single convergence flow channel (5) and the axial secondary convergence flow channel (4) in the direction vertical to the flow direction of the melt is firstly gradually decreased and then gradually increased, namely the melt is firstly converged and thinned in the radial direction of the drum-shaped substrate (1) and then dispersed and thickened.
2. The method of stretching and kneading a polymer melt according to claim 1, wherein: the radius of curvature of the outer surface (12) of the drum-shaped substrate (1) is gradually increased and decreased along the axial direction, and the change rate is consistent.
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