CN203125925U - Screw rod specially used for exhaust type mixing single-screw rod extruder pelletizing unit - Google Patents
Screw rod specially used for exhaust type mixing single-screw rod extruder pelletizing unit Download PDFInfo
- Publication number
- CN203125925U CN203125925U CN2012205186111U CN201220518611U CN203125925U CN 203125925 U CN203125925 U CN 203125925U CN 2012205186111 U CN2012205186111 U CN 2012205186111U CN 201220518611 U CN201220518611 U CN 201220518611U CN 203125925 U CN203125925 U CN 203125925U
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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
- B29C48/59—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw
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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
-
- 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
- B29C48/53—Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The utility model relates to a screw rod specially used for an exhaust type mixing single-screw rod extruder pelletizing unit; a screw rod body with an integral structure is sequentially provided with a feeding section, a first compression section, a first metering section, an exhaust section, a second compression section, a second metering section and an extrusion section, wherein the feeding section is a single-ended gradient lead conical screw rod; the first compression section is a deep thread large-lead screw rod; the first metering section is a deep thread large-lead screw rod connected with the first compression section, and is provided with a plurality of irregular pins which are taken as plastic elements and used for fully plastifying material; the exhaust section is a thread type screw rod connected with the first metering section, and the thread deepness of the exhaust section is gradually deeper than that of the first metering section; the second compression section is a uniform pitch screw rod provided with a spiral groove which gradually shallows; the second metering section is a uniform pitch screw rod provided with a spiral groove which gradually shallows, and is connected with the second compression section; and the extrusion section is a screw rod which is connected with the spiral groove of the second metering section, and the spiral groove of the extrusion section gradually shallows until being not available. The extruded product is compact and even without impurities, does not have an obvious air hole on the cross section, and is good in mechanical performances.
Description
Technical field
The utility model relates to a kind of exhaust extrusion screw rod, particularly a kind of exhaust banburying single-screw bar extruding pelletization unit bolt special that can produce the high filled plastics pellet of inorganic particle.
Background technology
Produce inorganic particle (calcium carbonate at present, calcium sulfate, copper sulphate, kaolin, carclazyte, mica powder, diatomite, titanium dioxide, zinc oxide, dolomite dust, silica, calcium silicates, talcum powder, pigment, glass fibre, hollow glass micropearl, Cab-O-sil, bentonite, whiting and composition thereof etc.) high fill (loading 40%～85%) produced plastics, during the rubber series of products, need make pellet earlier, the equipment of producing high granular filling material mainly contains the double-screw extruding pelletizing unit, single screw extruder pelletizer group, two steps type is extruded unit and exhaust banburying-single screw extruder pelletizer group; Though the twin-screw exhaust is fine, when but loading is excessive, material fluidity is poor, cause between material and the screw rod, shear between material and the machine barrel too big, frictional heat constantly increases, and molten temperature is difficult to control, causes partial material to be decomposed, the pellet physical property of producing is reduced, therefore limited addition and the scope of application; Single screw extruder pelletizer group does not have degassing function, and bad to the material plasticizing that loading is big, the pellet of producing and goods bubble are many, poor performance, and surface smoothness is bad, the product size poor stability, qualification rate is low; It is to enter single screw rod again after adopting double screw extruder to plastify earlier to carry out extruding pelletization that two steps type is extruded unit, this equipment also has the disadvantage of twin-screw, when material is carried from double screw extruder to single screw extrusion machine, through simultaneously and opening transfer, single screw extrusion machine does not have degassing function, therefore the pellet of producing still has bubble, poor performance; Exhaust banburying-single screw extruder pelletizer group is to produce the optimal equipment of high packing material; banbury can be set the banburying time according to the material situation; guarantee that material plasticizing reaches optimum efficiency; again through bipyramid feeding feeding extruder; this moment, material had air to be wrapped in the material when banburying and bipyramid feeding; therefore need the exhaust single screw extrusion machine extruding pelletization with special construction; the gas that melt is carried secretly when bipyramid feeding feeding extruder; gas in the fused materials is not discharged and be wrapped in to material in the banburying process; monomer; oligomer; condensation polymer; moisture and material are in banburying; the volatile matter the like waste that a large amount of volatilization of extrusion Yin Wendu rising compositions produce are thoroughly discharged; and the closely knit pore-free of the pellet of extruding; the goods of producing do not have bubble; bubble and volatile matter abscess promote product quality.
Produce high (loading 40%～85%) plastics, the special-purpose pellet of rubber series of products of filling of inorganic particle because loading is big, therefore need exhaust, if not exhaust will cause the pellet packing low, the combination property of goods is poor, product surface fineness is bad, and bubble is arranged.Want to solve air bubble problem, the parts of exhaust banburying-single screw extruder pelletizer group most critical namely are screw rods.The screw-rod structure design of exhaust banburying-single screw extruder pelletizer group all has critical impact to feeding ability, metering conveying capacity, plasticizing rate, exhaust power, volatile matter and moisture content elimination ability, exhaust outlet overflow, melt extrusion temperature, melt extrusion pressure, the extruded product dimensional stability of packing material material.Therefore the screw rod design is determining the exhaust banburying-ability to work of single screw extruder pelletizer group and the product properties of producing.
The working thread of extruder screw generally is made up of feeding section, compression section, metering section, exhaust section, second compression section, second metering section, the section of pumping seven parts in exhaust banburying both at home and abroad-single screw extruder pelletizer group at present, and screw slenderness ratio ratio all is greater than 25:1.This exhaust banburying-single screw extruder pelletizer group is to producing not enough as follows that high filled plastics pellet mainly exists:
1, screw slenderness ratio is oversize, because material has reached molten condition through banburying secret refining plasticizing, do not need plasticizing for a long time, material slow-witted overlong time in screw rod can produce chain rupture or cross the shearing phenomenon material, influence product properties, especially when loading is above above 50%, in the process along with the continuous operation of screw speed, melt and screw rod, the frictional heat that machine barrel produces improves constantly, loading is more big, the frictional heat that produces is more big, melt temperature also constantly increases, and along with the temperature of the continuous increase melt of screw rod running time can more and more be difficult to control, causes the performance of material to descend, its colour changed into yellow can influence output again if painstakingly control screw speed;
2, the feeding section mostly is shallow thread greatly, pitch is little, and its material feeding feeding ability is relatively poor, and speed is slow, yields poorly;
3, the compression section is long, and screw thread is shallow, and material is long operational time under high pressure, and material and screw rod and machine barrel fraction time are long, and the material plasticizing time is long, easily causes material to cross plasticizing phenomenon, incipient scorch, jaundice even degraded, causes the granule performance of producing relatively poor;
4, metering section pitch is too wide, oversize, because material is in the fully plasticizing of banburying process, the viscosity flow of material is better, enter from the compression section and to have formed more closely knit lamellar morphology very soon behind the metering section, the chance of " freedom " Surface Renewal of melt is little, and gas is little from the inner escape probability of material, entering moisture and the volatile matter that the exhaust section sheet material is wrapped in material inside can not effectively be taken away by vacuum, influences moisture and volatile matter and discharges;
5; the screw rod exhaust section of exhaust banburying-single screw extruder pelletizer group of using both at home and abroad is long at present; because the material that extruder is extruded mainly is to utilize the propelling of screw rod spiral shell rib to transmit material forward by the frictional force between stickiness material and the machine barrel; and existing extruder exhaust section is long; exhaust outlet design is from the place of decompression section starting point away from; will cause material like this in the process of being fed forward; inevitably contact between material and the machine barrel; vacuum extractor supply and exhaust mouth place on the exhaust outlet causes very big negative pressure; and make the material of pressing close to exhaust ports on the machine barrel be easy to be sucked in the exhaust outlet, stop up exhaust outlet.Influencing material is fed forward; cause material to stockpile at metering section simultaneously; the exhaust outlet overflow; be fed forward ability; therefore have to reduce extruded velocity for fear of this situation; therefore there are defectives such as the adaptability that yields poorly, fills a prescription is narrow, the easy overflow of exhaust outlet, self-cleaning ability difference mostly in exhaust banburying both at home and abroad-single screw extruder pelletizer group at present, and mostly is small dimension unit, the little Φ big specification exhaust banburying-single screw extruder pelletizer group more than 150.
6, exhaust screw rod in the market mostly is the sudden change formula, and this screw rod dead angle is many, is easy to generate the thickener phenomenon, makes material be easy to generate impurity and degraded, reduces the combination property of pellet and goods.
The utility model content
The utility model is in view of the deficiency that exists on the above-mentioned prior art; a kind of exhaust banburying single-screw bar extruding pelletization unit bolt special is provided; can make high (loading 40%～85%) material of filling of inorganic particle in banburying, extruding pelletization production process, get rid of material gas inside, monomer, oligomer, condensation polymer, moisture and other volatile matters effectively; enhance productivity, strengthen product quality and performances.
The technical scheme that adopts is:
Exhaust banburying single-screw bar extruding pelletization unit bolt special, the screw rod body that is structure as a whole is established feeding section, first compression section, first metering section, exhaust section, second compression section, second metering section, extruding zone successively.Described feeding section is the single head gradual change helical pitch conical screw that prevents the anti-stream of material.It is to make material push the big helical pitch screw rod of closely knit deep thread gradually when being fed forward that fluxing zone also is in described first compression section.Described first metering section is the big helical pitch screw rod of deep thread that connects first compression section, and is provided with many at this section and makes random pin that material fully plastifies, stirs as the plasticizing element.Described exhaust section is the connection first metering section screw thread, and the screw-type screw rod that this section depth of thread deepens gradually than the first metering section depth of thread; Described second compression section is the uniform pitch screw that screw channel shoals gradually, makes the compression of extrusion plastic pellet complete, closely knit, even.Described second metering section is for connecting the uniform pitch screw that the second compression section screw channel shoals gradually.Described extruding zone is for connecting the second metering section screw channel, and this section spiral groove depth shoals gradually until the screw rod of no screw channel.
Above-mentioned its draw ratio of screw rod body is 20:1, reduces the time that the good material of internal mixing and plasticizing stops in screw rod, the physical property of favourable raising pellet.
The beneficial effect that the utility model is obtained is:
1, the utility model and exhaust screw rod difference in the past are that the draw ratio of screw rod shortens and to have only 20:1, and this point is innovative point in the exhaust screw rod.Its advantage is to have reduced the time that stops behind the good material feeding extruder of internal mixing and plasticizing in screw rod, reduces material and the shearing defective excessively that screw rod, machine barrel friction cause, and improves the physical property of pellet.
2, feeding section screw thread, pitch spacing darker 10% than screw flight in the market also grown 5%, increased the feeding ability, improved output, producing high packing material is doubled than present exhaust list screw rod output, general output is at 400-500 ㎏ per hour, and the utility model output per hour can reach 600-800 ㎏.
3, fully plastify owing to material banburying, long with screw rod and machine barrel fraction time under high-voltage operation in order to prevent material, produce frictional heat, plasticizing, material jaundice even signs of degradation appearred, shorten about 10-15% than general screw rod the compression section of the utility model design screw rod, shortens running time about 10%, when improving rate of feeding, reduce material because of frictional heat and cross the probability that the shearing appearance is decomposed, guaranteed product quality and output;
4, the general screw rod of the metering section pitch ratio of the utility model screw rod shortens 5%, and a plurality of random pins of two spiral shell sections have been increased in this section, form alternately dentation, increased the shearing frequency of material at metering section, make material after the process shearing of cotter slot, fully stir, form irregular fragment or fragment, increased " freedom " surface area and the renewal rate thereof of melt, the moisture and the volatile matter that are wrapped in material inside are overflowed rapidly, taken away by vacuum, thereby improve degassing efficiency.Make the closely knit even pore-free of the pellet of extruding, the goods of production do not have bubble, bubble and volatile matter abscess, promote product quality.
5, in order to improve the degassing efficiency of exhaust screw rod, avoid exhaust outlet putty, overflow problem, screw rod in the market adopts the lengthening exhaust section more, and exhaust outlet design is from the place of decompression section starting point away from, reduce extruded velocity, or increase the mode of porous disc.It is still not thorough to lengthen the exhaust section exhaust for high packing material, has also strengthened the negative pressure of exhaust outlet simultaneously, also can strengthen the problem of overflow and putty.Reduce the extruded velocity mode and be unfavorable for improving output.The mode that increases porous disc has increased the dead angle, and material is stayed easily to produce in the dead angle and decomposed, and reduces the performance of material.Therefore the utility model has adopted in the screw rod design and has shortened the exhaust section distance, exhaust section short about 20% than general screw rod, the design of decompression section is the gradual change form, and it is the darkest that exhaust outlet is located at screw thread, stress-free position, avoid contacting between material and the machine barrel, and material is not full of whole screw channel through short exhaust section the time, can not form bigger negative pressure, so exhaust outlet can not stopped up by material, can remove the gas between the material well, solve exhaust outlet overflow problem simultaneously.Improve output simultaneously, improved the performance of product again.The big small screw of the design is all suitable, has broken through the present situation of the big specification exhaust banburying-single screw extruder pelletizer group of no Φ more than 150.
6, exhaust screw rod in the market mostly is the sudden change formula, and the utility model patent adopts the gradual change type screw rod, and the thickener phenomenon of solved place, screw rod dead angle sizing, gathering materials and producing reduces material impurity, improves the goods combination property.Simultaneously, the section of gradual change type screw rod with section between be connected gently, make that high packing material surge with screw rod in flow process is little, improve the flow rate of material, increased output, and reduced the wearing and tearing of screw rod, in addition, the self-cleaning ability of screw rod is strong, has prolonged the service life of screw rod.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the partial enlarged drawing of cotter slot among Fig. 1.
Fig. 3 is the profile of Fig. 2.
Fig. 4 is the profile of Fig. 1.
The specific embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with the drawings and specific embodiments, be further elaborated.
Exhaust banburying single-screw bar extruding pelletization unit bolt special; the screw rod body that is structure as a whole is established feeding section 1, first compression section 2, first metering section 3, exhaust section 4, second compression section 5, second metering section 6, extruding zone 7 compositions (seeing Fig. 1, Fig. 4) successively.Described feeding section 1 is single head gradual change helical pitch conical screw, prevents from that material is counter to flow.It is to make material push the big helical pitch screw rod of closely knit deep thread gradually when being fed forward that fluxing zone also is in described first compression section 2.Described first metering section 3 is the big helical pitch screw rods of deep thread that connect first compression section, it is closely knit that material is pushed when being fed forward gradually, and a random pin (seeing Fig. 2, Fig. 3) is arranged more than 50 as the plasticizing element in this section design, increase pressure, make material fully plastify, stir, increase " freedom " surface area of melt.Described exhaust section 4 is for connecting the first metering section screw thread, and the screw-type screw rod that this section depth of thread deepens gradually than the first metering section depth of thread, this section must keep zero pressure, the screw channel of this section only fills to realize for polymer moieties, when screw channel is not filled fully, at least in the possibility that does not have pressure to take place along the screw channel direction, the depth of thread of exhaust section is bigger than the depth of thread of first metering section, big at least 3 times, the degree that screw channel is full of material is no more than 50 %, if surpassed, not only influence exhaust effect, also may cause the exhaust outlet overflow; During less than 50 %, material by the time fully get rid of gas and volatile matter, but the screw rod operate as normal.The constant worm pich that described second compression section 5 shoals gradually for screw channel, the constant worm pich that second metering section 6 shoals gradually for the continuous second compression section screw channel, described extruding zone 7 is for connecting the second metering section screw channel, this section spiral groove depth shoals gradually until the screw rod of no screw channel, it is big that pressure becomes gradually, stable equilibrium when material is extruded makes the compression of extrusion plastic pellet complete, closely knit, even, has guaranteed product quality.The draw ratio of the utility model screw rod is 20:1, for having reduced the time that stops behind the good material feeding extruder of internal mixing and plasticizing in screw rod, reduces material and the shearing defective excessively that screw rod, machine barrel friction cause, and improves the physical property of pellet.
The utility model is through being applicable to plurality of specifications exhaust banburying-single screw extruder pelletizer group; the used unit of present embodiment is Φ 150 exhaust banburyings-single screw extruder pelletizer group; this unit rated speed is 60rpm; extruder die is Φ 195; the result shows: the high granular filling material of extruding; output be the 600-800 kilogram/hour; head pressure is about 20Mpa; the closely knit even free from admixture of extruded product; cross section does not have obvious pore; products machinery is functional, does not have the burnt signs of degradation of sticking with paste, and exhaust outlet does not have putty; the overflow phenomenon; stop feeding idle running and shut down dismantling screw after five minutes, no buildup in the screw channel.
Claims (2)
1. exhaust banburying single-screw bar extruding pelletization unit bolt special, it is characterized in that the screw rod body that this screw rod is structure as a whole, establish feeding section (1), first compression section (2), first metering section (3), exhaust section (4), second compression section (5), second metering section (6), extruding zone (7) successively; Described feeding section (1) is for preventing the single head gradual change helical pitch conical screw of the anti-stream of material; It is to make material push the big helical pitch screw rod of closely knit deep thread gradually when being fed forward that fluxing zone also is in described first compression section (2); Described first metering section (3) is the big helical pitch screw rod of deep thread that connects first compression section, and is provided with many at this section and makes random pin that material fully plastifies, stirs as the plasticizing element; Described exhaust section (4) is the connection first metering section screw thread, and the screw-type screw rod that this section depth of thread deepens gradually than the first metering section depth of thread; The uniform pitch screw that described second compression section (5) shoals gradually for screw channel; Described second metering section (6) is for connecting the uniform pitch screw that the second compression section screw channel shoals gradually; Described extruding zone (7) is for connecting the second metering section screw channel, and this section spiral groove depth shoals gradually until the screw rod of no screw channel.
2. exhaust banburying single-screw bar extruding pelletization unit bolt special according to claim 1 is characterized in that described its draw ratio of screw rod body is 20:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205186111U CN203125925U (en) | 2012-10-11 | 2012-10-11 | Screw rod specially used for exhaust type mixing single-screw rod extruder pelletizing unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205186111U CN203125925U (en) | 2012-10-11 | 2012-10-11 | Screw rod specially used for exhaust type mixing single-screw rod extruder pelletizing unit |
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| CN203125925U true CN203125925U (en) | 2013-08-14 |
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| CN2012205186111U Expired - Fee Related CN203125925U (en) | 2012-10-11 | 2012-10-11 | Screw rod specially used for exhaust type mixing single-screw rod extruder pelletizing unit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104816398A (en) * | 2015-04-11 | 2015-08-05 | 厦门川汉环保科技有限公司 | Double-heating granulation apparatus with application of recovered waste plastic films |
| CN106584806A (en) * | 2016-12-22 | 2017-04-26 | 无锡南方电工机械有限公司 | Divergence and convergence screw |
| CN106938530A (en) * | 2017-04-05 | 2017-07-11 | 华南理工大学 | A kind of special extrusion screw rod of heat-proof polythene and its extrusion method |
| CN107716524A (en) * | 2017-11-14 | 2018-02-23 | 成都新柯力化工科技有限公司 | It is a kind of that the method for recycling house refuse is cleaned using screw extruder |
| CN107775937A (en) * | 2017-11-21 | 2018-03-09 | 南京科森挤出装备有限公司 | Changeable Lead becomes groove and becomes rib combined type supercharging thread bush |
| CN108972928A (en) * | 2018-08-10 | 2018-12-11 | 芜湖市旭辉电工新材料有限责任公司 | A kind of PTC exothermic material goes bubble mixing method |
| CN111855491A (en) * | 2019-04-28 | 2020-10-30 | 中国石油化工股份有限公司 | Method and device for detecting flow state of polymer melt |
-
2012
- 2012-10-11 CN CN2012205186111U patent/CN203125925U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104816398A (en) * | 2015-04-11 | 2015-08-05 | 厦门川汉环保科技有限公司 | Double-heating granulation apparatus with application of recovered waste plastic films |
| CN106584806A (en) * | 2016-12-22 | 2017-04-26 | 无锡南方电工机械有限公司 | Divergence and convergence screw |
| CN106938530A (en) * | 2017-04-05 | 2017-07-11 | 华南理工大学 | A kind of special extrusion screw rod of heat-proof polythene and its extrusion method |
| CN107716524A (en) * | 2017-11-14 | 2018-02-23 | 成都新柯力化工科技有限公司 | It is a kind of that the method for recycling house refuse is cleaned using screw extruder |
| CN107716524B (en) * | 2017-11-14 | 2020-08-21 | 成都新柯力化工科技有限公司 | Method for cleaning and recycling household garbage by using screw extruder |
| CN107775937A (en) * | 2017-11-21 | 2018-03-09 | 南京科森挤出装备有限公司 | Changeable Lead becomes groove and becomes rib combined type supercharging thread bush |
| CN108972928A (en) * | 2018-08-10 | 2018-12-11 | 芜湖市旭辉电工新材料有限责任公司 | A kind of PTC exothermic material goes bubble mixing method |
| CN111855491A (en) * | 2019-04-28 | 2020-10-30 | 中国石油化工股份有限公司 | Method and device for detecting flow state of polymer melt |
| CN111855491B (en) * | 2019-04-28 | 2023-08-22 | 中国石油化工股份有限公司 | Method and device for detecting flow state of polymer melt |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20161011 |