CN203141815U - Screw of single screw extruder - Google Patents
Screw of single screw extruder Download PDFInfo
- Publication number
- CN203141815U CN203141815U CN2013201071147U CN201320107114U CN203141815U CN 203141815 U CN203141815 U CN 203141815U CN 2013201071147 U CN2013201071147 U CN 2013201071147U CN 201320107114 U CN201320107114 U CN 201320107114U CN 203141815 U CN203141815 U CN 203141815U
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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
- 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
- B29C48/64—Screws with two or more threads
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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
- 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
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
Abstract
The utility model relates to a screw of a single screw extruder. The screw comprises a feeding section, a compression-separation section and a metering section from front to back in sequence; wherein the feeding section is provided with a main thread; the compression-separation section is provided with a main thread and an auxiliary thread; and the metering section is provided with a main thread. The screw is characterized in that a mixing section is arranged between the compression-separation section and the metering section; the mixing section is provided with the main thread and the auxiliary thread and comprises a plurality of small mixing sections from front to back in sequence; on the Nth ( N is an odd number) mixing section, the bottom diameter of the main thread is gradually decreased from front to back, and the bottom diameter of the auxiliary thread is gradually increased from front to back; on the (N+1)th mixing section, the bottom diameter of the main thread is gradually increased from front to back, and the bottom diameter of the auxiliary thread is gradually decreased from front to back. As the bottom diameters of the main thread and the auxiliary thread of the the mixing section are alternately changed, so that materials are compressed and loosened alternately, and the materials are completely plasticized and evenly mixed; the plastic materials extruded by the single screw extruder adopting the screw is high in viscosity; and the prepared plastic product has few crystal points and bubbles.
Description
Technical field
The utility model relates to the parts of extruder, is specifically related to a kind of screw rod of single screw extrusion machine.
Background technology
At present, adopt extruder to extrude in the process of processing plastic goods (as PETG (PET) goods), device therefor is generally: adopt not the single screw extrusion machine with degassing function, and supporting use crystallizing and drying equipment, plastic raw materials is sent into single screw extrusion machine and is extruded processing after crystallizing and drying equipment is done the crystallizing and drying processing; Perhaps adopt double screw extruder or the multi-screw extruder of band exhaust structure, plastic raw materials can directly send into this double screw extruder or multi-screw extruder is extruded processing.
Adopt not extrude with the single screw extrusion machine of degassing function to add man-hour, following problem occurs through regular meeting: 1, melt mixed is even inadequately, so that the plastic products (as the PET goods) that make crystalline substance is put and bubble is more; 2, in order to realize plasticizing effect preferably, require screw rod to have bigger compression ratio, it is bigger that this can cause the plastics materials temperature to raise, so that the plastics materials viscosity of extruding is low, and the plastic products color that makes is yellow partially; 3, energy consumption height in the extrusion process.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of screw rod of single screw extrusion machine, and the plastics materials viscosity that adopts the single screw extrusion machine of this screw rod to extrude is higher, and the brilliant point of the plastic products that make and bubble are few.The technical scheme that adopts is as follows:
A kind of screw rod of single screw extrusion machine, comprise feed zone successively from A-P, compression segregation section and metering section, feed zone is provided with main thread, compression segregation section is provided with main thread and deputy thread, metering section is provided with main thread, it is characterized in that: be provided with mixing section between described compression segregation section and the metering section, mixing section is provided with main thread and deputy thread, mixing section comprises a plurality of mixing segments successively from A-P, wherein on the odd number mixing segment end of main thread without leave A-P reduce gradually, the end of deputy thread without leave A-P increase gradually, on the even number mixing segment end of main thread without leave A-P increase gradually, the end of deputy thread without leave A-P reduce gradually.
Above-mentioned screw rod is followed successively by feed zone, compression segregation section, mixing section and metering section from A-P.At feed zone, material enters screw rod and fusing, flows to compression segregation section behind the formation melt; Compression segregation section has melt screw channel and solid screw channel, the solid of the melt in the material with not fusion can be separated, and improves melting efficiency, tentatively material is plastified; The major-minor core diameter of thread alternately changes (being corrugated) on the mixing section, realizes the compression of material, the alternately generation of loosening, and finally makes material plastify fully and mix; Metering section makes from the material fusion homogenizing of mixing section and is quantitatively transferred to the extruder die head.
The draw ratio of preferred described screw rod is (30-37): 1.
Above-mentioned mixing section has two melt screw channels, wherein forms the first melt screw channel between main thread and the deputy thread, forms the second melt screw channel between deputy thread and the main thread.Usually, in the above-mentioned mixing section, the end of back one mixing segment front end main thread, directly equal the footpath, the end of last mixing segment rear end main thread, the end of back one mixing segment front end deputy thread, directly equal the footpath, the end of last mixing segment rear end deputy thread, makes the first melt screw channel and the second melt screw channel in the adjoiner smooth transition of adjacent two mixing segments.
On the preferred above-mentioned mixing section, the outer A-P without leave of main thread reduces gradually on the odd number mixing segment, the outer A-P without leave of deputy thread increases gradually, and the outer A-P without leave of main thread increases gradually on the even number mixing segment, the outer A-P without leave of deputy thread reduces gradually.Bigger position, footpath at the bottom of main thread, the material in the first melt screw channel can be crossed the deputy thread top and overflow in the second melt screw channel; Bigger position, footpath at the bottom of deputy thread, material in the second melt screw channel can be crossed the main thread top and overflow in the first melt screw channel, like this, material (fused materials) along mixing section in the process that A-P is carried, the first melt screw channel can carry out material each other with the second melt screw channel and exchange, and makes mixing of materials more even.
Preferred above-mentioned mixing section comprises successively that from A-P 3-6 is mixed segment.In a kind of concrete scheme, above-mentioned mixing section comprises successively that from A-P first mixes segment, second mixes segment, the 3rd mixes segment and the 4th mixes segment, first footpath, the end and the external diameter that mixes main thread on the segment all reduces gradually from A-P, second footpath, the end and the external diameter that mixes main thread on the segment all increases gradually from A-P, the 3rd footpath, the end and the external diameter that mixes main thread on the segment all reduces gradually from A-P, the 4th footpath, the end and the external diameter that mixes main thread on the segment all increases gradually from A-P, first footpath, the end and the external diameter that mixes deputy thread on the segment all increases gradually from A-P, second footpath, the end and the external diameter that mixes deputy thread on the segment all reduces gradually from A-P, the 3rd footpath, the end and the external diameter that mixes deputy thread on the segment all increases gradually from A-P, and the 4th footpath, the end and the external diameter that mixes deputy thread on the segment all reduces gradually from A-P.
On the preferred above-mentioned compression segregation section end of main thread without leave A-P increase (footpath, the end that the end of compressing segregation section front end main thread usually directly equals main thread on the feed zone) gradually; Compression segregation section comprises compression segregation section leading portion and compression segregation section back segment, on the compression segregation section leading portion end of deputy thread without leave A-P increase (footpath, the end that the end of compressing segregation section leading portion front end deputy thread usually directly equals main thread on the feed zone) gradually, on the compression segregation section back segment end of deputy thread without leave A-P reduce (footpath, the end that the end of compressing segregation section back segment front end deputy thread usually directly equals to compress the deputy thread of segregation section leading portion rear end) gradually, the 3-7%(that the length of described compression segregation section leading portion accounts for compression segregation section total length is 4-6% more preferably).Like this, the compression segregation section on, the end of main thread without leave A-P increase gradually, and footpath, the end of deputy thread reduces gradually from A-P generally, that is to say, along the mass transport direction, the degree of depth of solid screw channel reduces gradually, and the degree of depth of melt screw channel increases generally gradually.Usually the external diameter that compresses main thread on the segregation section is consistent, the external diameter of deputy thread also is consistent.The external diameter of deputy thread is less than the external diameter of main thread on the preferred compressed segregation section, and along with the conveying of material, the solid material in solid screw channel fusion gradually becomes melt, and enters into the melt screw channel.
The spiral shell rib width of the main thread of each several part directly is consistent the end of with on the common above-mentioned feed zone, and the spiral shell rib width of the main thread of each several part also is consistent with footpath, the end on the metering section; The footpath, the end of metering section is greater than the footpath, the end of feed zone, and the footpath, the end of metering section and the footpath, the end of feed zone are determined according to extruding required compression ratio.
In the specific design, owing to have additional deputy thread on compression segregation section and the mixing section, the pitch than main thread on feed zone and the metering section is big usually therefore to compress the pitch of main thread on segregation section and the mixing section; The pitch of main thread is usually consistent with the pitch of main thread on the mixing section on the compression segregation section; Above-mentioned feed zone comprises feed zone leading portion and feed zone back segment, wherein the pitch of the main thread of each several part is consistent on the feed zone leading portion, the pitch of main thread increases gradually from A-P on the feed zone back segment, and the main thread pitch of feed zone back segment rear end is consistent with the main thread pitch of compression segregation section; Above-mentioned metering section comprises metering section leading portion and metering section back segment, wherein the pitch of main thread reduces gradually from A-P on the metering section leading portion, the pitch of the main thread of each several part is consistent on the metering section back segment, and the main thread pitch of metering section leading portion front end is consistent with the main thread pitch of mixing section.
The utility model is by setting up mixing section in compression segregation section back, the major-minor core diameter of thread alternately changes on the mixing section, realize the compression of material, the alternately generation of loosening, finally make material plastify fully and mix, therefore, plastics (as the PET) material viscosity that adopts the single screw extrusion machine of this screw rod to extrude higher (by the test of viscosity measuring instrument, the viscosity of material descends less than 6% before and after the processing), and the brilliant point of the plastic products that make and bubble are few, meet industry standard.
Description of drawings
Fig. 1 is the structural representation of the utility model preferred embodiment;
Fig. 2 is the footpath, the end of main thread on the screw rod shown in Figure 1 and the variation schematic diagram of external diameter;
Fig. 3 is the footpath, the end of deputy thread on compression segregation section and the mixing section and the variation schematic diagram of external diameter.
The specific embodiment
As shown in Figure 1-Figure 3, the screw rod of this single screw extrusion machine comprises feed zone 1, compression segregation section 2, mixing section 3 and metering section 4 successively from A-P, feed zone 1 is provided with main thread 5, compression segregation section 2 is provided with main thread 5 and deputy thread 6, mixing section 3 is provided with main thread 5 and deputy thread 6, and metering section 4 is provided with main thread 5.In the present embodiment, feed zone 1 comprises feed zone 1 leading portion and feed zone 1 back segment, wherein the pitch of the main thread 5 of each several part is consistent on feed zone 1 leading portion, the pitch of main thread 5 increases gradually from A-P on feed zone 1 back segment, and main thread 5 pitch of feed zone 1 back segment rear end are consistent with main thread 5 pitch of compression segregation section 2; The pitch of the main thread 5 of each several part is consistent on the compression segregation section 2, and the pitch of the deputy thread 6 of each several part also is consistent on the compression segregation section 2; The pitch of the main thread 5 of each several part is consistent on the mixing section 3, and the pitch of the deputy thread 6 of each several part also is consistent on the mixing section 3; On the compression segregation section 2 on pitch and the mixing section 3 of main thread 5 pitch of main thread 5 consistent; Metering section 4 comprises metering section 4 leading portions and metering section 4 back segments, wherein the pitch of main thread 5 reduces gradually from A-P on metering section 4 leading portions, main thread 5 pitch of metering section 4 leading portion front ends are consistent with main thread 5 pitch of mixing section 4, and the pitch of the main thread 5 of each several part is consistent on metering section 4 back segments.
The spiral shell rib width of the main thread 5 of each several part directly is consistent the end of with on the feed zone 1, and the spiral shell rib width of the main thread 5 of each several part also is consistent with footpath, the end on the metering section 4; The footpath, the end of metering section 4 is greater than the footpath, the end of feed zone 1, and the footpath, the end of metering section 4 and the footpath, the end of feed zone 1 are determined according to extruding required compression ratio.
On the compression segregation section 2 end of main thread 5 without leave A-P increase (footpath, the end that the end of compression segregation section 2 front end main threads 5 directly equals main thread 5 on the feed zone 1) gradually; Compression segregation section 2 comprises compression segregation section leading portion 21 and compression segregation section back segment 22, on the compression segregation section leading portion 21 end of deputy thread 6 without leave A-P increase (end of compression segregation section leading portion 21 front end deputy threads 6 directly equals the footpath, the end of main thread 5 on the feed zone 1) gradually, on the compression segregation section back segment 22 end of deputy thread 6 without leave A-P reduce (end of compression segregation section back segment 22 front end deputy threads 6 directly equals to compress the footpath, the end of segregation section leading portion 21 rear end deputy threads 6) gradually, the length of compression segregation section leading portion 21 accounts for 5.6% of compression segregation section 2 total lengths in the present embodiment.On compression segregation section 2, form melt screw channel 7 between main thread 5 and the deputy thread 6, form solid screw channel 8 between deputy thread 6 and the main thread 5; Along the mass transport direction, the degree of depth of solid screw channel 8 reduces gradually, and the degree of depth of melt screw channel 7 increases generally gradually.The external diameter of main thread 5 is consistent on the compression segregation section 2, and the external diameter of deputy thread 6 also is consistent on the compression segregation section 2, and the external diameter of deputy thread 6 is less than the external diameter of main thread 5 on the compression segregation section 2.
Below adopt one group of specific design parameter to this screw rod be described further (referring to figs. 2 and 3, curve 11,13 illustrates the end footpath of main thread 5 on the screw rod and the Changing Pattern of external diameter respectively among Fig. 2, and curve 12,14 illustrates the footpath, the end of deputy thread 6 on compression segregation section 2 and the mixing section 3 and the Changing Pattern of external diameter respectively among Fig. 3): the draw ratio of screw rod is 34.2:1.The length of feed zone 1 is that 9Ds(Ds represents the screw rod external diameter, i.e. the external diameter of main thread 5 on the feed zone 1), the spiral shell rib width of main thread 5 is the end of 0.1Ds, main thread 5 directly to be 0.65Ds; The length of feed zone 1 leading portion is 7Ds, and the length of feed zone 1 back segment is 2Ds, and the pitch of main thread 5 is 1Ds on feed zone 1 leading portion, and the pitch of the main thread 5 of feed zone 1 back segment front end is 1Ds, and main thread 5 pitch of feed zone 1 back segment rear end are 1.2Ds.The length of compression segregation section 2 is 10.7Ds, and the length of compression segregation section leading portion 21 is 0.6Ds, and the length of compression segregation section back segment 22 is 10.1Ds; The pitch of main thread 5 and deputy thread 6 is 1.2Ds on the compression segregation section 2, the distance of deputy thread 6 initiating terminals and main thread 5 is 0.32Ds on the compression segregation section 2, the footpath, the end of 2 main threads 5 increases to 0.94Ds gradually by 0.65Ds on the compression segregation section, the footpath, the end of deputy thread 6 increases to 0.88Ds gradually by 0.65Ds on the compression segregation section leading portion 21, and the footpath, the end of deputy thread 6 is reduced to 0.7Ds gradually by 0.88Ds on the compression segregation section back segment 22.The length of mixing section 3 is 11Ds, and first mixes segment 31, the second mixing segment 32, the 3rd mixing segment 33 and the 4th length of mixing segment 34 is respectively 3.7Ds, 2.4Ds, 2.4Ds, 2.5Ds; First footpath, the end of mixing main thread 5 on the segment 31 is consistent by the footpath, the end that 0.94Ds is reduced to main thread 5 ends on footpath, the end that 0.79Ds(first mixes main thread 5 initiating terminals on the segment 31 and the compression segregation section 2 gradually), second footpath, the end of mixing main thread 5 on the segment 32 increases to 0.91Ds gradually by 0.79Ds, the 3rd footpath, the end of mixing main thread 5 on the segment 33 is reduced to 0.8Ds gradually by 0.91Ds, and the 4th footpath, the end of mixing main thread 5 on the segment 34 is consistent by the footpath, the end that 0.8Ds increases to main thread 5 on footpath, the end that 0.9Ds(the 4th mixes main thread 5 ends on the segment 34 and the metering section 4 gradually); First footpath, the end of mixing deputy thread 6 on the segment 31 is consistent by the footpath, the end that 0.7Ds increases to deputy thread 6 ends on footpath, the end that 0.92Ds(first mixes deputy thread 6 initiating terminals on the segment 31 and the compression segregation section 2 gradually), second footpath, the end of mixing deputy thread 6 on the segment 32 is reduced to 0.79Ds gradually by 0.92Ds, the 3rd footpath, the end of mixing deputy thread 6 on the segment 33 increases to 0.93Ds gradually by 0.79Ds, and the 4th footpath, the end of mixing deputy thread 6 on the segment 34 is consistent by the footpath, the end that 0.93Ds is reduced to main thread 5 on footpath, the end that 0.9Ds(the 4th mixes deputy thread 6 ends on the segment 34 and the metering section 4 gradually); The pitch of main thread 5 and deputy thread 6 is 1.2Ds on the mixing section 3.The length of metering section 4 is that the spiral shell rib width of 3.5Ds, main thread 5 is that the end of 0.1Ds, main thread 5 is directly for 0.9Ds, the length of metering section 4 leading portions is 2 Ds, the length of metering section 4 back segments is 1.5 Ds, the pitch of the main thread 5 of metering section 4 leading portion front ends is 1.2 Ds, the pitch of the main thread 5 of metering section 4 leading portion rear ends is 1Ds, and the pitch of main thread 5 is 1Ds on metering section 4 back segments.
Brief description has the operation principle of the single screw extrusion machine of this screw rod once:
At feed zone 1, material enters screw rod and fusing, flows to compression segregation section 2.
The major-minor core diameter of thread alternately changes (being corrugated) on the mixing section 3, realizes the compression of material, the alternately generation of loosening, and finally makes the material from compression segregation section 2 plastify fully and mix.On the mixing section 3, in bigger position, footpath, 5 ends of main thread, the material in the first melt screw channel 9 can be crossed deputy thread 6 tops and overflow in the second melt screw channel 10; In bigger position, footpath, 6 ends of deputy thread, material in the second melt screw channel 10 can be crossed main thread 5 tops and overflow in the first melt screw channel 9, like this, material (fused materials) along mixing section 3 in the process that A-P is carried, the first melt screw channel 9 can carry out material each other with the second melt screw channel 10 and exchange, and makes mixing of materials more even.
Metering section 4 makes from the material fusion homogenizing of mixing section 3 and is quantitatively transferred to the extruder die head.
Claims (6)
1. the screw rod of a single screw extrusion machine, comprise feed zone successively from A-P, compression segregation section and metering section, feed zone is provided with main thread, compression segregation section is provided with main thread and deputy thread, metering section is provided with main thread, it is characterized in that: be provided with mixing section between described compression segregation section and the metering section, mixing section is provided with main thread and deputy thread, mixing section comprises a plurality of mixing segments successively from A-P, wherein on the odd number mixing segment end of main thread without leave A-P reduce gradually, the end of deputy thread without leave A-P increase gradually, on the even number mixing segment end of main thread without leave A-P increase gradually, the end of deputy thread without leave A-P reduce gradually.
2. the screw rod of single screw extrusion machine according to claim 1, it is characterized in that: on the described mixing section, the outer A-P without leave of main thread reduces gradually on the odd number mixing segment, the outer A-P without leave of deputy thread increases gradually, and the outer A-P without leave of main thread increases gradually on the even number mixing segment, the outer A-P without leave of deputy thread reduces gradually.
3. the screw rod of single screw extrusion machine according to claim 1 and 2 is characterized in that: described mixing section comprises successively that from A-P 3-6 is mixed segment.
4. the screw rod of single screw extrusion machine according to claim 2, it is characterized in that: described mixing section comprises successively that from A-P first mixes segment, second mixes segment, the 3rd mixes segment and the 4th mixes segment, first footpath, the end and the external diameter that mixes main thread on the segment all reduces gradually from A-P, second footpath, the end and the external diameter that mixes main thread on the segment all increases gradually from A-P, the 3rd footpath, the end and the external diameter that mixes main thread on the segment all reduces gradually from A-P, the 4th footpath, the end and the external diameter that mixes main thread on the segment all increases gradually from A-P, first footpath, the end and the external diameter that mixes deputy thread on the segment all increases gradually from A-P, second footpath, the end and the external diameter that mixes deputy thread on the segment all reduces gradually from A-P, the 3rd footpath, the end and the external diameter that mixes deputy thread on the segment all increases gradually from A-P, and the 4th footpath, the end and the external diameter that mixes deputy thread on the segment all reduces gradually from A-P.
5. according to the screw rod of claim 1,2 or 4 described single screw extrusion machines, it is characterized in that: on the described compression segregation section end of main thread without leave A-P increase gradually; Compression segregation section comprises compression segregation section leading portion and compression segregation section back segment, on the compression segregation section leading portion end of deputy thread without leave A-P increase gradually, on the compression segregation section back segment end of deputy thread without leave A-P reduce gradually, the length of described compression segregation section leading portion accounts for the 3-7% of compression segregation section total length.
6. the screw rod of single screw extrusion machine according to claim 5 is characterized in that: the external diameter of main thread is consistent on the described compression segregation section, the external diameter of deputy thread also is consistent, and the external diameter of deputy thread is less than the external diameter of main thread on the compression segregation section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201071147U CN203141815U (en) | 2013-03-09 | 2013-03-09 | Screw of single screw extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201071147U CN203141815U (en) | 2013-03-09 | 2013-03-09 | Screw of single screw extruder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203141815U true CN203141815U (en) | 2013-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013201071147U Expired - Fee Related CN203141815U (en) | 2013-03-09 | 2013-03-09 | Screw of single screw extruder |
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| CN (1) | CN203141815U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103101180A (en) * | 2013-03-09 | 2013-05-15 | 广东达诚机械有限公司 | Screw rod of single screw extruder |
| CN105058743A (en) * | 2015-07-24 | 2015-11-18 | 广东轻工职业技术学院 | Homodromous self-cleaning double-screw extrusion machine with number of starts gradually changing and with whole-process self-cleaning function and machining method thereof |
-
2013
- 2013-03-09 CN CN2013201071147U patent/CN203141815U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103101180A (en) * | 2013-03-09 | 2013-05-15 | 广东达诚机械有限公司 | Screw rod of single screw extruder |
| WO2014139065A1 (en) * | 2013-03-09 | 2014-09-18 | 广东达诚机械有限公司 | Screw rod of single screw extruder |
| CN105058743A (en) * | 2015-07-24 | 2015-11-18 | 广东轻工职业技术学院 | Homodromous self-cleaning double-screw extrusion machine with number of starts gradually changing and with whole-process self-cleaning function and machining method thereof |
| US11014267B2 (en) | 2015-07-24 | 2021-05-25 | Guangdong Industry Polytechnic | Co-rotating self-cleaning two-screw extruder with a gradual number of threads and through self-cleaning function, and a processing method using the same |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20150309 |
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