CN201538027U - A large polymer product extrusion molding device - Google Patents
A large polymer product extrusion molding device Download PDFInfo
- Publication number
- CN201538027U CN201538027U CN2009202202106U CN200920220210U CN201538027U CN 201538027 U CN201538027 U CN 201538027U CN 2009202202106 U CN2009202202106 U CN 2009202202106U CN 200920220210 U CN200920220210 U CN 200920220210U CN 201538027 U CN201538027 U CN 201538027U
- Authority
- CN
- China
- Prior art keywords
- melt
- branch
- planetary gear
- gear pump
- runner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001125 extrusion Methods 0.000 title claims abstract description 36
- 229920000642 polymer Polymers 0.000 title abstract 3
- 239000000155 melt Substances 0.000 claims abstract description 37
- 238000013016 damping Methods 0.000 claims abstract description 20
- 238000000465 moulding Methods 0.000 claims abstract description 11
- 230000004931 aggregating effect Effects 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 19
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000036760 body temperature Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
-
- 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
- B29C48/365—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pumps, e.g. piston pumps
- B29C48/37—Gear pumps
-
- 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
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle zone
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92961—Auxiliary unit, e.g. for external melt filtering, re-combining or transfer between units
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model discloses a large-scale polymer product extrusion molding device, which comprises an extrusion system, a melt collecting device, a melt planet gear pump, a melt planet gear pump transmission and control device, a melt planet gear pump temperature control device, branch flow channels, branch flow channel temperature control devices, a branch flow channel connector, a head body, branch flow channels inside a head, a damping device, a molding flow channel, a die, a die adjusting device and a head temperature control device. A material flow is divided into a plurality of material flows through the melt planet gear pump and sectioned to enter the branch flow channels inside the head in even pressure, and the material flows evenly flow out the die through auxiliary adjustment of the damping device and the die adjusting device. The large-scale polymer product extrusion molding device solves the difficult problem that the requirement of high precision is difficult to be realized when a large-scale head is processed, and remedies negative influence caused by ambient temperature change, flow channel roughness difference, head body material heat treatment difference, melt flow difference and the like by employing the branch flow channel temperature control devices to independently control the temperature of each section.
Description
Technical field
The utility model relates to extrusion molding equipment technology field, refers in particular to a kind of extruder of realizing large-scale high molecular products extrusion molding.
Background technology
Extrusion molding occupies very consequence in plastic product forming processing industry.According to statistics, in plastic product forming processing, the output of extrusion moulding product ranks first.With other forming methods relatively, extrusion molding has serialization production, productivity ratio height, be widely used the characteristics with smail investments and quick rerurn.Along with plastic extruding forming broad application and development, the type of extruder is increasing.
Extruder high speed, high yield can make the investor obtain the bigger output and the repayment of great number with lower input.Extruder efficiently be mainly reflected in high production, low energy consumption, low manufacturing cost aspect.In function aspects, screw extruder not only is used for the extrusion molding and the mixing processing of macromolecular material, and its purposes has been widened fields such as food, feed, electrode, explosive, building materials, packing, paper pulp, pottery.
But, the difficult point that extruder screw rotating speed high speed has also brought a series of needs to overcome: it is uneven that time of staying minimizing in screw rod can cause the mixing plasticizing of material as material, the excessive shear that stands material may cause hurried intensification of material and thermal decomposition, extrude stability control difficulty and can cause the fluctuation of extrudate physical dimension, the relevant servicing unit and the precision of control system must improve, the wearing and tearing of screw rod and machine barrel aggravation needs to adopt high abrasion and superelevation wear-resistant material, and how decelerator and bearing improve problem such as its life-span under situation about running up all need solution.
In addition, realize that the maximization of extrusion equipment can reduce production costs, this is more obvious in aspect advantages such as large-scale twin-screw granulation unit, blown film unit, pipe extruder groups.Yet, massive article is extruded mould required precision height, when especially extruding bigger film of bigger thin-gage goods of diameter or fabric width and sheet material, even mouthful mould machining accuracy height, if but the fluctuation of bead mould temperature also can exert an influence to the flowability of melt, and then influence the resultant articles quality, low owing to extruding the high head pressure of output in addition, the fluctuation of extruder plasticizing process also can produce bigger influence to the precision of extruded product.
The utility model content
The purpose of this utility model provides a kind of extrusion molding apparatus that is fit to extrude large-scale high molecular products, can eliminate the influence of extrusion plasticizing fluctuation to shaped article quality, the mouth mould is divided into plurality of sections, minimizing is to the dependence of head machining accuracy, the forming process degree of controllability is improved, and the machining large thin-gage goods is more prone to.
The technical solution of the utility model is, a kind of large-scale high molecular products extrusion molding apparatus, mainly comprise extrusion system, the melt aggregating apparatus, the melt planetary gear pump, pump drive of melt planetary gear and control device, melt planetary gear pump temperature control equipment, branch's runner, affluent-dividing channel temp control device, branch's flow path connector, handpiece body, branch's runner in the head, damping unit, molding runners, the mouth mould, mouth mould adjusting device, the head temperature control device, extrusion system comprises one or more extruder, the inlet of melt aggregating apparatus is connected with the outlet of the melt of extrusion system, the melt aggregating apparatus will compile from the melt of one or more extruder, the melt aggregating apparatus has one or more inlets, the melt aggregating apparatus has an outlet, the outlet of melt aggregating apparatus is connected with melt planetary gear pump intake, flow through its temperature of melt of melt planetary gear pump temperature control equipment control, the rotation of pump drive of melt planetary gear and control device control melt planetary gear pump middle gear, regulate rotating speed, the flow of control melt, melt is divided into some branches and flows out from melt planetary gear pump discharge behind the melt planetary gear pump, each melt planetary gear pump discharge connects branch's runner, control the temperature of the melt of each branch's runner by affluent-dividing channel temp control system according to the mobility status of mouth mould place melt, branch's runner is connected with handpiece body by its branch's flow path connector, for endless shaper article, branch's runner circumferentially in the handpiece body, branch's runner and branch's flow path connector can be made an integral body, damping unit is installed on the handpiece body, be positioned at the end of branch's runner, be used to provide and stop, make the melt pressure and the flow velocity that converge once more reach even, the mouth mould is installed in the exit of handpiece body, mouth mould adjusting device is used to regulate mouthful size of mould outlet gap, it between mouth mould and damping unit the molding runners of handpiece body, be used for transition, and make the further homogenizing of melt flows from damping unit to mouth mould runner gap.
The extrusion system of a kind of large-scale high molecular products extrusion molding apparatus of the utility model can be single screw extrusion machine, double screw extruder, multi-screw extruder, two-rotor continuous mixer, reciprocating screw extruder or mill extruder or two or more type combination wherein.
Melt planetary gear pump temperature control equipment add thermal recovery heating rod, heating collar, heater strip or fluid media (medium).The heating of runner temperature control system also can be adopted heating rod, heating collar, heater strip or fluid media (medium).
Different according to branch's runner and handpiece body link position, the sectional area of branch's runner can be different, for being the situation of sheet material as goods, near flowing of molding runners both sides melt because wall effect flow velocity resistance is big, branch's cross section of fluid channel can be greatly, also can on branch's runner, cut-off equipment be set, regulate pressure.
The expressing technique process of a kind of large-scale high molecular products extrusion molding apparatus of the utility model is: macromolecular material is after the loading hopper of extruder enters machine barrel, macromolecular material is plastifying under the effect of extruder temperature controller system and under the effect of the shearing force of screw rod rotation formation, the macromolecular material of fusing is that melt enters into the melt aggregating apparatus from the outlet of extruder outflow, melt enters into the melt planetary gear pump again through the melt aggregating apparatus, the melt that the melt planetary gear pump will compile is divided into uniform some branches, divide number to equal planetary number, each branch outlet of melt planetary gear pump connects branch's runner, each branch's runner length of flow is identical, identical to guarantee the melt speed that branch's runner enters the mouth in handpiece body with pressure, melt enters into branch's runner in the handpiece body through branch's flow path connector, under the stopping of damping unit, evenly distribute, melt flows through the head molding runners after crossing damping unit, transient process through molding runners, make melt with uniform flowing velocity and pressure current outlet mould, again through typing, cooling obtains goods.The handpiece body temperature control equipment can only be controlled the bulk temperature of head, can't eliminate along the junction of circumferentially segmentation or the influence that environmental change brings for the handpiece body temperature control equipment, flow velocity and flow difference according to flow export mould melt, can control the temperature of the melt of each branch's runner by affluent-dividing channel temp control system, because the flow behavior of macromolecular material is very big to dependence on temperature, mouth mould adjusting device is mainly used in the gap of regulating melt-flow outlet mould, and heat treated difference of water passage surface roughness difference and head and fluidity of molten difference can adapt to by the adjusting of melt temperature.
The utility model is owing to having adopted melt planetary gear pump and the pump drive of melt planetary gear thereof and control device, melt planetary gear pump temperature control equipment, melt enters flowing of head and is not subjected to directly influencing of extrusion system, if when requiring extrusion system that high output is provided, can select many middle-size and small-size extruders feed simultaneously for use, reduce and made processing and the adjusting cost that large-scale extruder brings.Because planetary gear pump shunting precision height, the melt planetary gear pump evenly is divided into multiply with one materials flow, segmentation enters into branch's runner of handpiece body with uniform pressure again, even flow export mould under the auxiliary adjustment of damping unit and mouthful mould adjusting device, obtain high-quality goods, overcome the high-leveled and difficult difficult problem of precision prescribed that the machining large head faces, by affluent-dividing channel temp control device the independence of each section temperature has been controlled and remedied variation of ambient temperature to realize, runner roughness difference, handpiece body material heat treatment difference, the adverse effect that melt flows difference etc. is brought.
Description of drawings
Fig. 1 is the vertical view of a kind of large-scale high molecular products extrusion molding apparatus of the utility model.
Among the figure: 1. pump drive of melt planetary gear and control device, 2. extrusion system, 3. melt aggregating apparatus, 4. melt planetary gear pump temperature control equipment, 5. melt planetary gear pump, 6. branch's runner, 7. affluent-dividing channel temp control device, 8. branch's flow path connector, 9. handpiece body, 10. branch's runner in the head, 11. damping unit, 12. molding runners, 13. mouthfuls of moulds, 14. mouthful mould mounting screw, 15. mouthful mould adjustment screw, 16. head temperature control device, 17. branch's runner inlets, 18. melt planetary gear pump discharge, 19. melt planetary gear pump intakes.
The specific embodiment
Figure 1 shows that an embodiment of the present utility model, goods are sheet material.A kind of large-scale high molecular products extrusion molding apparatus of the utility model, mainly comprise pump drive of melt planetary gear and control device 1, extrusion system 2, melt aggregating apparatus 3, melt planetary gear pump temperature control equipment 4, melt planetary gear pump 5, branch's runner 6, affluent-dividing channel temp control device 7, branch's flow path connector 8, handpiece body 9, branch's runner 10 in the head, damping unit 11, molding runners 12, mouth mould 13, mouth mould adjusting device, head temperature control device 16, mouth mould adjusting device comprises a mouthful mould mounting screw 14, mouth mould adjustment screw 15, the inlet of melt aggregating apparatus 3 is connected with the melt outlet of extrusion system 2, melt aggregating apparatus 3 will compile from the melt of one or more extruder, melt aggregating apparatus 3 has one or more inlets, melt aggregating apparatus 3 has an outlet, the outlet of melt aggregating apparatus 3 is connected with melt planetary gear pump intake 19, flow through its temperature of melt of melt planetary gear pump temperature control equipment 4 control, the rotation of pump drive of melt planetary gear and control device 1 control melt planetary gear pump 5 middle gears, regulate rotating speed, the flow of control melt, melt is divided into some branches and flows out from melt planetary gear pump discharge 18 behind melt planetary gear pump 5, each melt planetary gear pump discharge 18 of melt planetary gear pump 5 connects branch's runner 6, the affluent-dividing channel temp control system 7 that is installed on branch's runner 6 is regulated the melt temperature of flowing through herein, branch's runner 6 is connected with handpiece body 9 by its branch's flow path connector 8, the inlet of melt on handpiece body 9 is branch's runner inlet 17, branch's runner 6 can be made an integral body with branch's flow path connector 8, damping unit 11 is installed on the handpiece body 9, be positioned at the end of head branch runner 10, be used to provide and stop, make the melt pressure and the flow velocity that converge once more reach even, mouth mould 13 is installed in the exit of handpiece body 9, a mouth mould mounting screw 14 and a mouthful mould adjustment screw 15 are distributed on mouthful mould 13, unclamp a mouthful mould mounting screw 14 when regulating mouth mould 13 earlier, mouth mould adjustment screw 15 drives mouthful moulds 13, and trace is mobile up or down, after finishing, adjustment tightens a mouthful mould mounting screw 14 again, adjusting device is used to regulate the size of mouthful mould 13 outlet gaps, it between mouth mould 13 and damping unit 11 molding runners 12 of handpiece body, be used for transition, and make the further homogenizing of melt flows from damping unit 11 to mouth mould 13 runner gaps.The melt planetary gear has 6 planetary gears in the present embodiment, and branch's runner 6 is 6, and damping unit 11 comprises damping sheet and mounting screw, and damping sheet is screwed on handpiece body.Shown in Figure 1 in handpiece body 9 be about two parts, be illustrated as the top of having removed handpiece body 9.Control the temperature of the melt of each branch's runner 6 according to the mobility status of mouth mould 13 place's melts by affluent-dividing channel temp control system, for example when certain section melt flow rate is slow, improve the melt control temperature of corresponding therewith branch's runner 6.Because programming rate is slower, slowly carries out during adjusting, waiting flows mediates when stablizing again.13 places can increase some sensors at the mouth mould, and the adjustment formation closed-loop control with affluent-dividing channel temp control device 7 is carried out conciliation automatically.
Claims (3)
1. one kind large-scale high molecular products extrusion molding apparatus, it is characterized in that: mainly comprise extrusion system, the melt aggregating apparatus, the melt planetary gear pump, pump drive of melt planetary gear and control device, melt planetary gear pump temperature control equipment, branch's runner, affluent-dividing channel temp control device, branch's flow path connector, handpiece body, branch's runner in the head, damping unit, molding runners, the mouth mould, mouth mould adjusting device, the head temperature control device, the melt aggregating apparatus has entrance and exit, the inlet of melt aggregating apparatus is connected with the outlet of the melt of extrusion system, the outlet of melt aggregating apparatus is connected with melt planetary gear pump intake, the rotation of pump drive of melt planetary gear and control device control melt planetary gear pump middle gear, the control of melt planetary gear pump temperature control equipment is arranged in the temperature of melt planetary gear pump melt, melt is divided into some branches and flows out from melt planetary gear pump discharge behind the melt planetary gear pump, each melt planetary gear pump discharge connects branch's runner, the affluent-dividing channel temp control system that is installed on branch's runner is regulated the melt temperature of flowing through herein, branch's runner is connected with handpiece body by its branch's flow path connector, damping unit is installed on the handpiece body and is positioned at the end of head branch runner, the mouth mould is installed in the exit of handpiece body, mouth mould adjusting device is regulated a mouthful mould outlet gap, the temperature of head temperature control device control head is the molding runners of handpiece body between mouth mould and damping unit.
2. a kind of large-scale high molecular products extrusion molding apparatus according to claim 1 is characterized in that: extrusion system adopts single screw extrusion machine, double screw extruder, multi-screw extruder, two-rotor continuous mixer, reciprocating screw extruder or mill extruder or two or more type combination wherein.
3. a kind of large-scale high molecular products extrusion molding apparatus according to claim 1 is characterized in that: on branch's runner cut-off equipment is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202202106U CN201538027U (en) | 2009-10-26 | 2009-10-26 | A large polymer product extrusion molding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202202106U CN201538027U (en) | 2009-10-26 | 2009-10-26 | A large polymer product extrusion molding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201538027U true CN201538027U (en) | 2010-08-04 |
Family
ID=42589481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202202106U Expired - Lifetime CN201538027U (en) | 2009-10-26 | 2009-10-26 | A large polymer product extrusion molding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201538027U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029717A (en) * | 2010-10-13 | 2011-04-27 | 北京化工大学 | Vulcanized rubber processing device and method |
| CN102039657A (en) * | 2009-10-26 | 2011-05-04 | 青岛科技大学 | Extrusion moulding apparatus for large-scale macromolecular product and process thereof |
| CN113635511A (en) * | 2020-05-11 | 2021-11-12 | 禄弘股份有限公司 | Die head and extrusion molding method for extrusion molding equipment for foamed materials |
-
2009
- 2009-10-26 CN CN2009202202106U patent/CN201538027U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102039657A (en) * | 2009-10-26 | 2011-05-04 | 青岛科技大学 | Extrusion moulding apparatus for large-scale macromolecular product and process thereof |
| CN102039657B (en) * | 2009-10-26 | 2013-03-20 | 青岛科技大学 | Extrusion moulding apparatus for large-scale macromolecular product and process thereof |
| CN102029717A (en) * | 2010-10-13 | 2011-04-27 | 北京化工大学 | Vulcanized rubber processing device and method |
| CN102029717B (en) * | 2010-10-13 | 2013-05-29 | 北京化工大学 | A vulcanized rubber processing device and method |
| CN113635511A (en) * | 2020-05-11 | 2021-11-12 | 禄弘股份有限公司 | Die head and extrusion molding method for extrusion molding equipment for foamed materials |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100804 Effective date of abandoning: 20091026 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20100804 Effective date of abandoning: 20091026 |
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| RGAV | Abandon patent right to avoid regrant |