CN201471714U - Backpressure milling-type screw rod - Google Patents
Backpressure milling-type screw rod Download PDFInfo
- Publication number
- CN201471714U CN201471714U CN2009201403589U CN200920140358U CN201471714U CN 201471714 U CN201471714 U CN 201471714U CN 2009201403589 U CN2009201403589 U CN 2009201403589U CN 200920140358 U CN200920140358 U CN 200920140358U CN 201471714 U CN201471714 U CN 201471714U
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- CN
- China
- Prior art keywords
- section
- rod
- mixing
- back pressure
- screw rod
- 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
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Classifications
-
- 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
- B29C48/585—Screws provided with gears interacting with the flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/565—Screws having projections other than the thread, e.g. pins
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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 provides a backpressure mixing-type screw rod which comprises a rotating head, a rod body and an external thread, wherein the rotating head and the rod body are fixed together. The backpressure mixing-type screw rod has reasonable and compact structure and is convenient to use. All parts from the feed end and the discharge end are of the mixing type. Since the operating pressure and the outlet backpressure of the extruding machine are increased, the mixing effect of the molten materials is improved and the dispersion coefficient of supercritical carbon dioxide in the materials is increased, the uniform distribution of carbon dioxide in the molten materials is ensured. Besides, the operating pressure and the outlet backpressure of the second extruding machine are increased, the die orifice pressure difference and the foaming power are increased, the die orifice material temperature is reduced, the material viscosity is increased, and the escape of carbon dioxide during the release of the die orifice pressure is prevented, so that the foaming rate of the expanded polystyrene plastic product is increased by 28.5 to 31 times, the bulk density is reduced from 35 kg/m3 to 32 kg/m3, the flexibility is increased by 20%, and the compression strength is increased by 20%, and the product quality is greatly improved. The backpressure mixing-type screw rod achieves the purpose of environment-friendly production of expanded polystyrene plastics for heat insulation by using carbon dioxide.
Description
One, technical field
The utility model relates to the extruder bolt special, is the mixing formula screw rod of a kind of back pressure, is specially adapted to the adiabatic polystyrene foam plastics second extruder bolt special of using of supercritical carbon dioxide foam production.
Two, background technology
Usually extrusion molding polystyrene polyfoam for heat insulation second extruder screw in the foam production of fluorine Lyons is pusher screw rod, draw ratio is 28 to 1, and power of motor is less, and this screw rod operating pressure is little, the material fltting speed is fast, the material melting effect is poor, and when being used for blown with carbon dioxide, it is mixing and dispersion effect is relatively poor, thereby it is adiabatic lower with the polystyrene foam plastics expansion ratio, have only 20 to 22 times, product unit weight is heavier, is 45kg/m
3To 50kg/m
3The cavity is more, of poor quality, has therefore lost commodity value.
Three, summary of the invention
The utility model provides a kind of back pressure mixing formula screw rod, has overcome the deficiency of above-mentioned prior art, and it can effectively solve existing pusher screw rod can't make product reach the problem of acceptable quality when being used for blown with carbon dioxide.
The technical solution of the utility model realizes by following measure: the mixing formula screw rod of a kind of back pressure, comprise rotary head, the body of rod and external screw thread, the rotary head and the body of rod are fixed together, external screw thread is arranged on the body of rod, the body of rod is a feed end near an end of rotary head, the other end of the body of rod is a discharge end, this body of rod is divided into 5 sections, and being that high-temperature mixing section, cooling increase propulsive force section, cooling mixer, melt advances in regular turn from feed end to the discharge end of the body of rod increases back pressure section and the strong temperature descending section of melt mixed; The footpath, the end of each section is all identical.
Be further optimization and/or improvements below to above-mentioned utility model technical scheme:
On at the bottom of the externally threaded tooth on the above-mentioned high-temperature mixing section backflash can be arranged, increase at the bottom of the externally threaded tooth of a side of close high-temperature mixing section of propulsive force section in cooling on backflash is arranged, backflash is arranged advance at the bottom of the externally threaded tooth of increase back pressure section and the strong temperature descending section of melt mixed at melt on.
The length of the above-mentioned body of rod can be 35 to 1 with the ratio of body of rod external diameter.
The length of the above-mentioned body of rod can be 7 meters, and body of rod external diameter is 0.2 meter.
The length of above-mentioned high-temperature mixing section can be 0.8 meter, and the length that cooling increases the propulsive force section is 3.2 meters, and the length of cooling mixer is 0.8 meter, and it is 1.6 meters that melt advances the length that increases the back pressure section, and the length of the strong temperature descending section of melt mixed is 0.6 meter.
The footpath, the end of above-mentioned each section all can be 0.135 meter.
The utility model reasonable and compact in structure, easy to use, all mixing formula from the feed end to the discharge end, owing to increased extruder operating pressure and outlet back pressure, improved the melting effect and the coefficient of dispersion of supercritical carbon dioxide in material of fused materials, carbon dioxide is uniformly dispersed in fused materials; Increase the second extruder operating pressure and outlet back pressure again, increased die orifice pressure reduction and foaming power; Reduced the die orifice temperature of charge, improved material viscosity, stoped carbon dioxide to be escaped when die orifice pressure discharges, thereby made thermal insulation bring up to 28.5 to 31 times with polystyrene foam plastics product expansion ratio, unit weight is reduced to 35kg/m
3To 32kg/m
3, pliability improves 20%, and compressive strength improves 20%, so the quality of product is greatly improved, and has realized the adiabatic purpose with polystyrene foam plastics of carbon dioxide environmental protection foam production.
Four, description of drawings
Accompanying drawing 1 is the main TV structure schematic diagram of the utility model most preferred embodiment.Coding in the accompanying drawing is respectively: 1 is rotary head, and 2 is the body of rod, and 3 is external screw thread, and A is the high-temperature mixing section, and B increases the propulsive force section for lowering the temperature, and C is the cooling mixer, and D is that melt advances increase back pressure section, and E is the strong temperature descending section of melt mixed, and H is a body of rod external diameter, and I is footpath, the end.
Five, the specific embodiment
The utility model is not subjected to the restriction of following embodiment, can determine concrete embodiment according to the technical solution of the utility model and actual conditions.
Below in conjunction with embodiment and accompanying drawing the utility model is further described:
As shown in Figure 1, the mixing formula screw rod of this back pressure comprises rotary head 1, the body of rod 2 and external screw thread 3, the rotary head 1 and the body of rod 2 are fixed together, external screw thread 3 is arranged on the body of rod 2, the body of rod 2 is a feed end near an end of rotary head 1, the other end of the body of rod 2 is a discharge end, and this body of rod 2 is divided into 5 sections, and being that high-temperature mixing section A, cooling increase propulsive force section B, cooling mixer C, melt advances in regular turn from feed end to the discharge end of the body of rod 2 increases back pressure section D and the strong temperature descending section E of melt mixed; Footpath, the end I of each section is all identical.
Can according to actual needs the mixing formula screw rod of above-mentioned back pressure be made further optimization and/or improvements:
As shown in Figure 1, on at the bottom of the externally threaded tooth on the high-temperature mixing section A backflash is arranged, increase at the bottom of the externally threaded tooth of a side of close high-temperature mixing section A of propulsive force section B in cooling on backflash is arranged, on at the bottom of the externally threaded tooth of melt propelling increase back pressure section D and the strong temperature descending section E of melt mixed, backflash is arranged, backflash is set blend melt is refluxed, thereby can make blend melt mixing more even.
As shown in Figure 1, the length of the body of rod 2 is 35 to 1 with the ratio of body of rod external diameter H.
As shown in Figure 1, according to actual needs, the length of the body of rod is 7 meters, and body of rod external diameter is 0.2 meter.
As shown in Figure 1, according to actual conditions, the length of high-temperature mixing section A is 0.8 meter, the length that cooling increases propulsive force section B is 3.2 meters, the length of cooling mixer C is 0.8 meter, and it is 1.6 meters that melt advances the length that increases back pressure section D, and the length of the strong temperature descending section E of melt mixed is 0.6 meter.
As shown in Figure 1, footpath, the end of each section I is 0.135 meter.
Above technical characterictic has constituted most preferred embodiment of the present utility model, and it has stronger adaptability and best implementation result, can increase and decrease non-essential technical characterictic according to actual needs, satisfies the demand of different situations.
The use of the utility model most preferred embodiment: seating nipple is arranged in the outside of the present utility model, during work, rotary head 1 drives the body of rod 2 and rotates, the blend melt that has carbon dioxide and material enters in the seating nipple from feed end, pressure in the seating nipple is 16Mpa to 10Mpa, when blend melt enters into high-temperature mixing section A in regular turn, cooling increases propulsive force section B, cooling mixer C, melt all can carry out mixing when advance increasing the strong temperature descending section E of back pressure section D and melt mixed and carbon dioxide and material are fully disperseed and melt mixed, body temperature is controlled at about 100 ℃ to 70 ℃, the die temperature of discharge end is controlled at 50 ℃ to 45 ℃, fuselage pressure is controlled at 16Mpa to 10Mpa, and the die orifice back pressure is controlled at 7Mpa to 8Mpa.Like this, improve material viscosity and to carbon dioxide affinity, barrier property, prevent that carbon dioxide from escaping when die orifice pressure discharges with low temperature; Improve the die orifice back pressure to 7Mpa, can increase die orifice pressure reduction, strengthen the foaming power of die orifice extruded material, thereby can improve the expansion ratio of XPS, reduce product unit weight.
Claims (9)
1. mixing formula screw rod of back pressure, it is characterized in that comprising rotary head, the body of rod and external screw thread, the rotary head and the body of rod are fixed together, external screw thread is arranged on the body of rod, the body of rod is a feed end near an end of rotary head, the other end of the body of rod is a discharge end, and this body of rod is divided into 5 sections, and being that high-temperature mixing section, cooling increase propulsive force section, cooling mixer, melt advances in regular turn from feed end to the discharge end of the body of rod increases back pressure section and the strong temperature descending section of melt mixed; The footpath, the end of each section is all identical.
2. the mixing formula screw rod of back pressure according to claim 1, on it is characterized in that at the bottom of the externally threaded tooth on the high-temperature mixing section backflash is arranged, increase at the bottom of the externally threaded tooth of a side of close high-temperature mixing section of propulsive force section in cooling on backflash is arranged, backflash is arranged advance at the bottom of the externally threaded tooth of increase back pressure section and the strong temperature descending section of melt mixed at melt on.
3. the mixing formula screw rod of back pressure according to claim 1 and 2, the length that it is characterized in that the body of rod is 35 to 1 with the ratio of body of rod external diameter.
4. the mixing formula screw rod of back pressure according to claim 3, the length that it is characterized in that the body of rod is 7 meters, body of rod external diameter is 0.2 meter.
5. the mixing formula screw rod of back pressure according to claim 4, the length that it is characterized in that the high-temperature mixing section is 0.8 meter, the length that cooling increases the propulsive force section is 3.2 meters, the length of cooling mixer is 0.8 meter, it is 1.6 meters that melt advances the length that increases the back pressure section, and the length of the strong temperature descending section of melt mixed is 0.6 meter.
6. the mixing formula screw rod of back pressure according to claim 1 and 2 is characterized in that the end of each section directly is 0.135 meter.
7. the mixing formula screw rod of back pressure according to claim 3 is characterized in that the end of each section directly is 0.135 meter.
8. the mixing formula screw rod of back pressure according to claim 4 is characterized in that the end of each section directly is 0.135 meter.
9. the mixing formula screw rod of back pressure according to claim 5 is characterized in that the end of each section directly is 0.135 meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201403589U CN201471714U (en) | 2009-08-05 | 2009-08-05 | Backpressure milling-type screw rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201403589U CN201471714U (en) | 2009-08-05 | 2009-08-05 | Backpressure milling-type screw rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201471714U true CN201471714U (en) | 2010-05-19 |
Family
ID=42407957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201403589U Expired - Lifetime CN201471714U (en) | 2009-08-05 | 2009-08-05 | Backpressure milling-type screw rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201471714U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102259403A (en) * | 2011-06-30 | 2011-11-30 | 张建群 | CO2 multi-component cooperative foaming and combined cooling screw rod |
| CN101619139B (en) * | 2009-08-05 | 2012-02-22 | 新疆西龙土工新材料股份有限公司 | Method for producing extrusion molding polystyrene polyfoam for heat insulation by supercritical carbon dioxide foaming |
| CN102615807A (en) * | 2012-03-22 | 2012-08-01 | 上海罗洋新材料科技有限公司 | Sealed twin screw |
-
2009
- 2009-08-05 CN CN2009201403589U patent/CN201471714U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101619139B (en) * | 2009-08-05 | 2012-02-22 | 新疆西龙土工新材料股份有限公司 | Method for producing extrusion molding polystyrene polyfoam for heat insulation by supercritical carbon dioxide foaming |
| CN102259403A (en) * | 2011-06-30 | 2011-11-30 | 张建群 | CO2 multi-component cooperative foaming and combined cooling screw rod |
| CN102259403B (en) * | 2011-06-30 | 2013-07-10 | 张建群 | CO2 multi-component cooperative foaming and combined cooling screw rod |
| CN102615807A (en) * | 2012-03-22 | 2012-08-01 | 上海罗洋新材料科技有限公司 | Sealed twin screw |
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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: 20100519 Effective date of abandoning: 20090805 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20100519 Effective date of abandoning: 20090805 |