CN208148457U - A kind of high revolving speed high yield PP extrusion screw rod of seven segmentation of two-stage - Google Patents
A kind of high revolving speed high yield PP extrusion screw rod of seven segmentation of two-stage Download PDFInfo
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- CN208148457U CN208148457U CN201820382238.9U CN201820382238U CN208148457U CN 208148457 U CN208148457 U CN 208148457U CN 201820382238 U CN201820382238 U CN 201820382238U CN 208148457 U CN208148457 U CN 208148457U
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Abstract
The utility model discloses a kind of high revolving speed high yield PP extrusion screw rods of seven segmentation of two-stage, feeding section is arranged in sequence along screw head direction is fed into, compression section, first metering section, cut section, depressurize section, second metering section and polyhedron mixing section, the feeding section is equipped with the charging spout that single thread is constituted, first and second described metering section is equipped with the measuring tank that single thread is formed, the decompression section is equipped with the relief groove that single thread is formed, the compression section is equipped with main thread and added thread, the single thread of the main thread and feeding section connects to form solid phase groove, the added thread connect to form liquid phase groove with the single thread of the first metering section, the cut section is equipped with multipair feed auger blind slot and discharging spiral blind slot, the entrance of the feed auger blind slot is connect with the first metering section, the discharging spiral blind slot is connect with decompression section.The utility model melting efficiency is high, plasticizing is uniform, it is high to be kneaded yield under uniform and high revolving speed.
Description
Technical field
The utility model relates to high revolving speed high yield PP extrusion screw rods, and in particular to a kind of high revolving speed high yield PP of seven segmentation of two-stage
Extrusion screw rod.
Background technique
The structure of existing common PP extrusion screw rod shows that screw rod is single thread structure, from the direction for being fed to screw head
Generally comprise feeding section, compression section, metering section and screw head, when plastics enter in barrel from hopper, thus material enter plus
Material section is gradually fed forward to compression section by material tube inner wall and screw surface rubbing action under the action of screw rotation, compresses
The spiral groove depth of section shoals, and solid material is further consolidated, while in barrel external heat, and is cut in screw rod and material tube inner wall friction
It cuts under effect, material heats up and starts to melt, and the material after melting enters metering section, this section squeezes the slave screw head of material dosing
Plastic melt out.
Currently used extrusion screw rod, when processing PP, generally there are matter homogenizing degree is poor, melting effect is poor, causes
Poor product quality, for yield by head pressure obvious effect, output fluctuation is big, especially under high head pressure, produces
Amount is decreased obviously, and production efficiency is lower, and output fluctuation is big, and furthermore in high yield or under the high revolving speed of screw rod, material does not reach
Melting.
Utility model content
In order to overcome shortcoming and deficiency of the existing technology, it is high that the utility model provides a kind of high revolving speed of seven segmentation of two-stage
Production PP extrusion screw rod, the utility model melting efficiency is high, plasticizing is uniform, is kneaded yield height and stable yield under uniform and high revolving speed
PP extrusion screw rod, under different rotating speeds and head pressure, the screw rod of stability of flow.
The utility model adopts the following technical solution：
A kind of high revolving speed high yield PP extrusion screw rod of seven segmentation of two-stage, along be fed into screw head direction be arranged in sequence feeding section,
Compression section, the first metering section, cut section, decompression section, the second metering section and polyhedron mixing section, the feeding section, compression end, the
One metering section and cut section constitute first order screw rod, and the decompression section, the second metering section and polyhedron mixing section constitute the second level
Screw rod, the feeding section are equipped with the charging spout that single thread is constituted, first and second described metering section is equipped with the meter that single thread is formed
Measuring tank, the decompression section are equipped with the relief groove that single thread is formed, and the compression section is equipped with main thread and added thread, the main spiral shell
The single thread of line and feeding section connects to form solid phase groove, and the added thread connect to form liquid phase with the single thread of the first metering section
Slot, the cut section are equipped with multipair feed auger blind slot and discharging spiral blind slot, the entrance and first of the feed auger blind slot
Metering section connection, the discharging spiral blind slot are connect with decompression section.
0.05-0.1 times of outer screw diameter of width of the charging spout, the depth of charging spout are 0.09-0.15 times of outer screw diameter,
The total length of feeding section is 5-10 times of outer screw diameter.
The outer screw diameter that the lead of the main thread is 1.1-2.1 times, width are 0.05-0.1 times of outer screw diameter；It is described
0.8-1.8 times of lead of outer screw diameter of added thread, width are 0.03-0.06 times of outer screw diameter, and length is 10-21 times of spiral shell
Bar outer diameter.
The width of the solid phase groove is gradually reduced from feeding section to first order metering section direction, and slot bottom is along feeding section
Slot bottom extends to first order metering section direction；Meter of the slot bottom of the liquid phase groove from added thread appearance towards first order metering section
Measuring tank slot bottom direction extends.
The width of the measuring tank of first metering section is greater than outer screw diameter, and remains unchanged, and the depth of measuring tank is 0.05-
0.11 times of outer screw diameter, less than the depth of charging spout, single thread width is 0.05-0.09 times of outer screw diameter, the first metering section
Total length is 2-6 times of outer screw diameter.
The cylindrical surface of the cut section is additionally provided with shared screw thread and non-common screw thread, the feed auger blind slot and discharging spiral shell
Rotation blind slot be even-even, the feed auger blind slot and discharging spiral blind slot orthogonal cross-sectional shape be semicircle.
The outer diameter of the shared screw thread is 0.6-1.5mm smaller than the outer diameter of non-common screw thread, and the length of the cut section is 1-4
Times outer screw diameter.
The metering groove width of second metering section is greater than outer screw diameter, and depth is 0.05-0.09 times of outer screw diameter, and
Less than the depth of decompression section.
The surface of the polyhedron mixing section is equipped with multiple spiral polyhedrons equidistantly arranged, annular on screw rod circumference
The number of arrangement is 4-30, is 4-10 row in the number of rows that screw shaft arranges upwards, the polyhedral cross sectional shape of spiral is parallel
Quadrangle, the length of polyhedron mixing section are 2-8 times of outer screw diameter.
The screw head is coning angle, and cone angle is 20-60 degree, and the effective length of screw rod is 38 times of outer screw diameter.
The beneficial effects of the utility model：
(1) at high speed, compared with the general single screw rod of same specification, output increased 30~90% is squeezed out；
(2) at high speed, compared with the general single screw rod of same specification, energy consumption reduces 10~30%；
(3) at high speed, compared with the general single screw rod of same specification, melt temperature reduces 5 DEG C；
(4) at high speed, compared with the general single screw rod of same specification, the service life of screw rod improves 10~50%.
Detailed description of the invention
Fig. 1 is a kind of high revolving speed high yield PP extrusion screw rod structural schematic diagram of seven segmentation of two-stage of the utility model；
Fig. 2 is the structural schematic diagram of compression section in Fig. 1；
Fig. 3 is the structural schematic diagram of cut section in Fig. 1；
Fig. 4 is the structural schematic diagram of polyhedron mixing section in Fig. 1.
Specific embodiment
Below with reference to examples and drawings, the utility model is described in further detail, but the reality of the utility model
It is without being limited thereto to apply mode.
Embodiment
As Figure 1-Figure 4, the high revolving speed high yield PP extrusion screw rod of a kind of seven segmentation of two-stage, edge are fed into 12 direction of screw head
Feeding section 5, compression section 6, the first metering section 7, cut section 8, decompression section 9, the second metering section 10 and polyhedron mixing is arranged in sequence
Section 11.
The feeding section, compression section, the first metering section and cut section constitute first order screw rod, the decompression section, the second meter
Measure section and polyhedron mixing section and constitute second level screw rod, the feeding section is equipped with the charging spout that single thread is constituted, described first and
Second metering section is equipped with the measuring tank that single thread is formed, and the decompression section is equipped with the relief groove that single thread is formed, the compression section
Equipped with main thread and added thread, the single thread of the main thread and feeding section connects to form solid phase groove, the added thread with
The single thread of first metering section connects to form liquid phase groove, and the cut section is equipped with multipair feed auger blind slot and discharging spiral is blind
The entrance of slot, the feed auger blind slot is connect with the first metering section, and the discharging spiral blind slot is connect with decompression section.
The screw head 12 is cone, and cone angle is 20~60 °.The effective length of screw rod is 38 times of outer screw diameter.
The feeding section designs for one start screw, and the width of charging spout is less than outer screw diameter, and remains unchanged, charging spout
Depth is 0.09-0.15 times of outer screw diameter, and is remained unchanged, and the width of thread is 0.05-0.1 times of outer screw diameter, feeding section 5 it is total
Length is 5-10 times of outer screw diameter, preferably 6 times of outer screw diameters.
The depth of the charging spout is greater than the depth of the measuring tank of the first metering section, to form enough compression ratios,
The compression section is equipped with the unequal main thread 63 of lead and added thread 64, and is formed and be connected respectively with charging spout
Solid phase groove and the liquid phase groove that is connected with measuring tank, the lead of main thread is 1.1-2.1 times of outer screw diameter, and added thread 64 is led
Journey is 0.8-1.8 times of outer screw diameter.
Compression segment length is 10~21 times of outer screw diameters.Advantageously ensure that main thread pushes solid material mobile and promotes it
Melting, while the convenient solid material melted is attached thread separation.
The width of the solid phase groove 62 gradually becomes smaller from feeding section to the first metering section direction, and the slot bottom of solid phase groove is along charging
The slot bottom of slot extends to the slot bottom direction of the first metering section.
The solid-phase material entered from charging spout can smoothly enter compression section, obstruction will not be generated to charging, in screw rod
Under operating and under barrel external heat, added thread is crossed after solid-phase material melting and enters liquid phase groove, improves material in barrel
Interior fusion plastification effect, and the material in solid phase groove can be persistently heated, and increase the heat exchange area of solid-phase material,
The solid-phase material that does not melt can also smoothly enter in metering section on a small quantity, will not generate strong shearing force or hinder into
Material shortens melting length and relative reduction melt temperature on the whole, is conducive to low temperature extrusion, material is avoided to overheat.
Of same size in the width and charging spout of the solid phase groove of feeding section side, the solid phase groove width in metering section side is
0.08-0.2 times for measuring groove width, the liquid phase groove width in feeding section side are 0.05-0.15 times of charging groove width,
The liquid phase groove width of metering section side is 0.7-0.9 times for measuring groove width, and the outer diameter of added thread is smaller than main thread outer diameter
0.7-1.5mm.Solid phase groove width is gradually reduced, and liquid phase groove width is gradually increased, and be can effectively improve material and is run in screw rod
Stability, be conducive to run at high speed.
The width of the measuring tank of first metering section is greater than outer screw diameter, and remains unchanged, and the depth of measuring tank is 0.05-
0.11 times of outer screw diameter, less than the depth of charging spout, single thread width is 0.05-0.09 times of outer screw diameter, the first metering section
Total length is 2-6 times of outer screw diameter.
Shearing segment length is 1~5 times of outer screw diameter；Multipair feed auger blind slot is set in cut section and discharging spiral is blind
Slot, each pair of feed auger blind slot and discharging spiral blind slot are separated, and the entrance of feed auger blind slot is connect with the first metering section,
The outlet for the spiral blind slot that discharges is connect with section is depressurized, and can reinforce the promotion effect to material, and the screw thread that material can pass through can be with
The solid-phase material that does not melt is stopped to enter discharging, while can be by shearing and friction promotes solid-phase material to melt or be plasticized；Object
Expect the small 0.6-2mm of outer diameter for the outer diameter screw thread more intransitable than material of screw thread that can pass through, can sufficiently to solid-phase material into
Row shearing friction, while being avoided that again and to form larger resistance, guarantee that material passes through smooth.
The depth of the relief groove of decompression section is greater than the depth of the measuring tank of the first metering section, in entire velocity interval inner screw
It operates, and is not influenced by pressure and speed under precise constant yield.
In the present embodiment, it is equipped with even number feed auger blind slot and discharging spiral blind slot, wherein the slot of feed auger blind slot
Bottom extends along liquid phase groove slot bottom to shared 81 surface direction of screw thread, discharge spiral blind slot slot bottom along share screw thread 81 surface to
The slot bottom direction for depressurizing section extends, and the outer diameter for sharing screw thread 81 is 0.6-1.5mm smaller than the outer diameter of non-common screw thread 84, screw thread
Width is 3-5mm.The length of cut section 8 is 1-4 times of outer screw diameter, preferably 2 times of outer screw diameters.Feed auger blind slot 82 and go out
The orthogonal cross-sectional shape for expecting spiral blind slot 83 is semicircle.
Decompression section 9 designs for one start screw, and the width of charging spout is greater than outer screw diameter, and remains unchanged, the depth of screw channel
It is deeper than the screw channel of first order metering section, and remain unchanged, the width of thread is 0.05-0.1 times of outer screw diameter, depressurizes the overall length of section 9
Degree is 1-5 times of outer screw diameter, preferably 2 times of outer screw diameters.
Second metering section 10 designs for one start screw, and the width of measuring tank is greater than outer screw diameter, and remains unchanged, measuring tank
Depth be 0.05-0.09 times of outer screw diameter, less than the depth of the screw channel of decompression section, and remain unchanged, width of thread 0.05-
0.09 times of outer screw diameter, the total length of the second metering section 10 are 5-11 times of outer screw diameter, preferably 7 times of outer screw diameters.
The polyhedron length of mixing is 2-8 times of major diameter of thread, and it is more that multiple spirals equidistantly arranged are arranged in surface
Face body, the cross sectional shape of polyhedron mixing section are parallelogram, and the area of bottom surface is greater than the area of top surface, polyhedron mixing
Melt can be broken up destruction by the polyhedron of section, upset the flowing of solid phase and liquid phase material, be material being separated and converge repeatedly
It closes, increases to material mixing, homo-effect, improve the dispersibility of additive, improve the uniformity of mixing.
The number of spiral polyhedron annular array on screw rod circumference is 4-30, is arranged upwards in screw shaft
Number of rows is 4-10 row.The cross sectional shape of spiral polyhedron 91 is parallelogram, and polyhedron mixing section is preferably outside 3 times of screw rods
Diameter.
Biggish draw ratio can guarantee residence time of the material in barrel under screw rod high-speed state, make it sufficiently
Plasticizing.
Feeding section uses one start screw, improves charging capability；Compression section is enhanced using the double thread structure of optimization
Fusion plastification effect improves material in the clogging of compression section, improves plasticizing capacity；
Cut section uses several pairs of helical groove structures, reinforces fusion plastification and mixed, and increase the propulsion to material
Effect；
Section is depressurized using the one start screw of deeper screw channel, reduces influence of the head pressure to feeding section charging capability, subtracts
Lack the pressure in machine barrel, reduces the abrasion of screw rod and machine barrel；
Polyhedron mixing section uses spiral polyhedral structure, has propulsion and immixture to material, the distribution of screw rod is mixed
Conjunction ability is reinforced, and improves that uniformity on direction in length and breadth, melting effect be good, good dispersion.Extrusion screw rod takes big major diameter
Than the revolving speed of screw rod can be improved, to improve extrusion output.Whole screw design is reasonable, can obtain high revolving speed, is high than producing
Amount, the PP product that plasticizing quality is good, accurate measurement, melt temperature are low.
The course of work of the utility model：
Material enters the feeding section 5 of screw rod from hopper, under screw speed effect, is gradually pushed to screw head 12 and quilt
Compacting, while gradually being melted under the shearing of screw rod and barrel and external heater effect.In the compression section of screw rod 6, material exists
Start to melt in transmission process, under the promotion of screw rod, molten material is crossed added thread 64 and is entered in liquid phase groove 61, and
The solids not melted are attached screw thread 64 and block, still in solid phase groove 62, to realize molten material and unmelted
The feed separation melted, in the place that solid phase groove 62 and liquid phase groove 61 are converged, basic melting is completed；The plastics and solid melted
Plastics are separated, so that the shearing that the plastics melted are subject to reduces, to realize that low temperature squeezes out, this is also to realize screw rod
It runs at high speed and provides condition.In cut section 8, on the one hand shares screw thread 81 and a certain size solid phase is stopped to pass through, stay in it
The shearing, extruding or heating by screw thread are continued on through in feed auger blind slot 82, promote to melt；On the other hand screw thread 81 is shared to more
The stronger shearing of material progress for sharing screw thread 81 is crossed, material, which is got back, further to be melted or be plasticized；Cross shared screw thread 81
Material generate eddy motion in discharging spiral blind slot 83, material is got back mixing.These shearings and mixing turn mechanical energy
Become thermal energy, so that the melting of strength imparting material is homogenized.When material flows through shared screw thread 81, each interlayer of stream has biggish speed
Difference generates interlayer slip and generates frictional heat, thus promotes the plasticizing of material；Material is when entering feed auger slot 82, object
If material is divided into carried interest by band-like laminar flow, after flowing through discharging spiral blind slot 83, if material is merged together by carried interest, stream
The direction for being also easy to produce vortex and stream changes, and such each section material redistribution mixing is conducive to point of additive and color masterbatch
It dissipates.In decompression section 9, since the pressure of head will not be moved along screw rod to feeding section as common screw, keep charging difficult,
Make to be obviously reduced along screw pressure, especially plus feeding section becomes apparent from, in entire velocity interval inner screw under precise constant yield
Operating, and do not influenced by pressure and speed, it measures more accurate.In the second metering section 10, melt under the promotion of screw thread,
Higher melt pressure is established, accurate as metering pump, quantitative melt conveying material increases positive stream, reduces pressure current and leakage
Stream makes to be plasticized more sufficiently more evenly.It is on the one hand that polyhedron mixing section smashes solid material in polyhedron mixing section 11,
Melt is destroyed, upset the two-phase flow of solid and liquid, and stream is repeatedly separated and converged, changes stream in barrel
Direction and VELOCITY DISTRIBUTION are sufficiently mixed solid phase and liquid phase, increase the heat transfer area between solid phase and liquid phase, and generate to material
Certain resistance and fricting shearing, make solid phase fusion；It on the other hand is that material is carried out to repeated segmentation, shunts and converges, to increase
Add the dispersibility to additive, color masterbatch.
After plastic raw materials enter the screw channel of screw rod, gradually pushed to 12 direction of screw head with the rotation of conical screw.
In feeding section 5, screw channel is filled by loose solids, and due to screw channel depth, therefore feeding quantity is larger.When material enters compression section
After 6, since screw channel gradually becomes shallower as, screw pitch becomes smaller, and higher pressure is formd in material, material is pressed very closely knit, and handle
The air and other volatile matters being mixed in material are forced to 5 direction of screw rod feeding section by screw channel and remove and be discharged, while outside
Under the action of frictional heat caused by heating and the shear action of screw rod, machine barrel to material, the temperature of plastics is gradually risen, and works as object
After material temperature degree reaches certain temperature, plastic raw materials gradually start to melt.With being fed forward for material, the plastics of melting gradually increase
It is more, and the plastics not melted gradually decrease, about at the end of compression section 6, plastics melt substantially.In the first metering section 7
Under homogenization, fused materials are squeezed into cut section 8 by screw rod.In polyhedron mixing section 11, polyhedron will repeatedly divide material
It opens and converges, be sufficiently mixed solid phase and liquid phase, and increase the heat transfer area between solid phase and liquid phase simultaneously, be conducive to accelerate
Solid phase fusion process, while the solid phase draw heat constantly from melt in melting process, it is possible to reduce the temperature of melt.
According to experiment, compared with common screw, the radial temperature difference of extrudate can reduce 1~3 DEG C, and transverse temperature difference can reduce 2
~5 DEG C；Material is subjected to repeated segmentation, shunts and converges, the material variation on its direction and position during the motion makes object
Different component can be dispersed and be mixed well in material, thus the available extrudate being uniformly mixed with low temperature.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by described
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (10)
1. a kind of high revolving speed high yield PP extrusion screw rod of seven segmentation of two-stage, which is characterized in that sequentially set along screw head direction is fed into
There are feeding section, compression section, the first metering section, cut section, a decompression section, the second metering section and polyhedron mixing section, the feeding section,
Compression end, the first metering section and cut section constitute first order screw rod, the decompression section, the second metering section and polyhedron mixing section structure
At second level screw rod, the feeding section is equipped with the charging spout that single thread is constituted, first and second described metering section is equipped with single thread
The measuring tank of formation, the decompression section are equipped with the relief groove that single thread is formed, and the compression section is equipped with main thread and added thread,
The single thread of the main thread and feeding section connects to form solid phase groove, and the added thread is connect with the single thread of the first metering section
Liquid phase groove is formed, the cut section is equipped with multipair feed auger blind slot and discharging spiral blind slot, and the feed auger blind slot enters
Mouth is connect with the first metering section, and the discharging spiral blind slot is connect with decompression section.
2. the high revolving speed high yield PP extrusion screw rod of seven segmentation of a kind of two-stage according to claim 1, which is characterized in that described to add
0.05-0.1 times of outer screw diameter of width of hopper, the depth of charging spout are 0.09-0.15 times of outer screw diameter, the total length of feeding section
For 5-10 times of outer screw diameter.
3. the high revolving speed high yield PP extrusion screw rod of seven segmentation of a kind of two-stage according to claim 1, which is characterized in that the master
The outer screw diameter that the lead of screw thread is 1.1-2.1 times, width are 0.05-0.1 times of outer screw diameter；The lead of the added thread
0.8-1.8 times of outer screw diameter, width are 0.03-0.06 times of outer screw diameter, and length is 10-21 times of outer screw diameter.
4. the high revolving speed high yield PP extrusion screw rod of seven segmentation of a kind of two-stage according to claim 1, which is characterized in that described solid
The width of phase slot is gradually reduced from feeding section to first order metering section direction, and slot bottom is along feeding section slot bottom to first order meter
Section direction is measured to extend；The slot bottom of the liquid phase groove prolongs from added thread appearance towards the measuring tank slot bottom direction of first order metering section
It stretches.
5. the high revolving speed high yield PP extrusion screw rod of seven segmentation of a kind of two-stage according to claim 1, which is characterized in that the first meter
The width for measuring the measuring tank of section is greater than outer screw diameter, and remains unchanged, and the depth of measuring tank is 0.05-0.11 times of outer screw diameter,
Less than the depth of charging spout, single thread width is 0.05-0.09 times of outer screw diameter, and the total length of the first metering section is 2-6 times of spiral shell
Bar outer diameter.
6. the high revolving speed high yield PP extrusion screw rod of seven segmentation of a kind of two-stage according to claim 1, which is characterized in that described to cut
The cylindrical surface of dissection is additionally provided with shared screw thread and non-common screw thread, and the feed auger blind slot and discharging spiral blind slot are even number
Right, the orthogonal cross-sectional shape of the feed auger blind slot and discharging spiral blind slot is semicircle.
7. the high revolving speed high yield PP extrusion screw rod of seven segmentation of a kind of two-stage according to claim 6, which is characterized in that described total
0.6-1.5mm smaller than the outer diameter of non-common screw thread with the outer diameter of screw thread, the length of the cut section is 1-4 times of outer screw diameter.
8. the high revolving speed high yield PP extrusion screw rod of seven segmentation of a kind of two-stage according to claim 1, which is characterized in that described
The metering groove width of two metering sections is greater than outer screw diameter, and depth is 0.05-0.09 times of outer screw diameter, and is less than the depth of decompression section
Degree.
9. the high revolving speed high yield PP extrusion screw rod of seven segmentation of a kind of two-stage according to claim 1, which is characterized in that described more
The surface of face body mixing section is equipped with multiple spiral polyhedrons equidistantly arranged, and the number of annular array is 4- on screw rod circumference
30, be 4-10 row in the number of rows that screw shaft arranges upwards, the polyhedral cross sectional shape of spiral is parallelogram, and polyhedron is mixed
The length for closing section is 2-8 times of outer screw diameter.
10. the high revolving speed high yield PP extrusion screw rod of seven segmentation of a kind of two-stage according to claim 1, which is characterized in that described
Screw head is coning angle, and cone angle is 20-60 degree, and the effective length of screw rod is 38 times of outer screw diameter.
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| CN201820382238.9U CN208148457U (en) | 2018-03-20 | 2018-03-20 | A kind of high revolving speed high yield PP extrusion screw rod of seven segmentation of two-stage |
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| CN201820382238.9U CN208148457U (en) | 2018-03-20 | 2018-03-20 | A kind of high revolving speed high yield PP extrusion screw rod of seven segmentation of two-stage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108437400A (en) * | 2018-03-20 | 2018-08-24 | 华南理工大学 | A kind of high rotating speed high yield PP extrusion screw rods of seven segmentation of two-stage |
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2018
- 2018-03-20 CN CN201820382238.9U patent/CN208148457U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108437400A (en) * | 2018-03-20 | 2018-08-24 | 华南理工大学 | A kind of high rotating speed high yield PP extrusion screw rods of seven segmentation of two-stage |
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Granted publication date: 20181127 Termination date: 20190320 |