CN1994722A - Screw dedicated for extruding pelletizing and pelleting for radiation cross-linking polyolefin foamed plastic - Google Patents
Screw dedicated for extruding pelletizing and pelleting for radiation cross-linking polyolefin foamed plastic Download PDFInfo
- Publication number
- CN1994722A CN1994722A CNA2005100970348A CN200510097034A CN1994722A CN 1994722 A CN1994722 A CN 1994722A CN A2005100970348 A CNA2005100970348 A CN A2005100970348A CN 200510097034 A CN200510097034 A CN 200510097034A CN 1994722 A CN1994722 A CN 1994722A
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- China
- Prior art keywords
- section
- screw rod
- slot type
- screw
- foamed plastic
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- 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.)
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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
- B29C48/67—Screws having incorporated mixing devices not provided for in groups B29C48/52 - B29C48/66
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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
- B29C48/53—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)
Abstract
The invention relates to a screw used to protrude particles and sheets of polyolefin foam plastic, wherein it comprises transmission screw section, groove baffle fold section, incline groove multi-head screw diverting section, etc. The groove baffle fold section is formed by several torsion channels on the face of screw; the torsion channel is formed by groove whose outlet is sealed and the narrow slim whose inlet is sealed. The invention can uniformly disperse the material in transmission, via shade structure to stop the non-fused solids, divert the direction and improve the disperse degree of additive. The inventive foam product has uniform holes.
Description
Technical field
The present invention relates to irradiated crosslinked polyalkene foam coiled material equipment part, specifically a kind of radiation cross-linking polyolefin foamed plastic extrusion granulating, extruding-tablet screw.
Background technology
The radiation cross-linking polyolefin foamed plastic coiled material, its raw material base-material is a polyethylene, adds auxiliary agents such as AC blowing agent, antioxidant, blowing promotor, colouring agent.The product typical process flow is as follows: PE base-material and various additives batch mixing → granulation → squeeze sheet → irradiation → foaming → check → packing to put in storage.
Expect evenly fine and closely woven irradiated crosslinked polyalkene froth pulp of abscess, granulation, crowded sheet are crucial, if granulation, crowded sheet process AC blowing agent and other auxiliary agent dispersed homogeneous degree height in polyethylene, the soffening of extrudate is good, and temperature range is controlled at the interval that the AC blowing agent can not decompose in advance again.Then the finished product expansion ratio of output is stable, and abscess is fine and closely woven, even, coiled material tensile strength, percentage elongation, resilience are good.Otherwise, at extrusion granulating, squeeze in the sheet product process auxiliary agent such as AC blowing agent and fail fully to disperse, mix, though extruded material plastifying state difference or extruded material plastifying state are good, but the extrusion molding processing temperature is higher, then can cause the finished product expansion ratio ratio of output not reach the design multiple, or because of the AC blowing agent decomposes in advance, it is thick that the finished product abscess will take place, inhomogeneous, the result of tensile strength, percentage elongation, resilience difference.It is good to reach material plasticizing, just improve the extrusion molding processing temperature, avoid the AC blowing agent to decompose in advance, then require to reduce the extrusion molding processing temperature, realize the lifting of production capacity, need to improve extruded velocity, for fear of material in machine barrel, owing to internal friction causes local heating, cause the AC blowing agent to decompose, must reduce extruded velocity again.Because the operation of granulation, crowded sheet is to adopt screw-type extruder to realize, and existing extruder screw is plain edition or divergence type basically, function singleness can not satisfy the requirement of the industry.
Summary of the invention
The object of the present invention is to provide and a kind ofly can improve the mixed material decentralization, not radiation cross-linking polyolefin foamed plastic extrusion granulating, the extruding-tablet screw of blow phase materials can dam.
Realize that technical scheme of the present invention is such: be provided with and not only have the convey materials function and have not only and make the not molten solid phase material can not be by damming face and can make flow direction of material produce the special screw rod of eddy current, turnover, redistribution but also compound.It comprises conveying screw rod section, straight channel type barrier baffling section, oblique slot type multiple-threaded screw shunting section etc. concrete structure, and this straight channel type barrier baffling section is to be made of a plurality of kinking passages that are distributed in the screw rod surface, and the kinking passage can be that groove and the partition of groove in the same way that adjacent arrival end seals of port of export sealing is provided with long and narrow excessive seam and is communicated with and forms; The conveying screw rod section and the constant volume type screw rod transmission section that subtract the appearance formula also can be arranged for the conveying screw rod section, and the conveying screw rod section that subtracts the appearance formula generally adopts at initial delivery end; Subtract appearance formula conveying screw rod segment structure and also can be in form uniform pitch subtract appearance formula conveying screw rod and non-uniform pitch subtract appearance formula conveying screw rod; Also have in the junction of conveying screw rod section and straight channel type barrier baffling section, conveying screw rod section and oblique slot type multiple-threaded screw shunting section, slot type barrier baffling section and oblique slot type multiple-threaded screw shunting section, oblique slot type multiple-threaded screw shunting section and oblique slot type multiple-threaded screw shunting section and can also be equipped with constriction shape annular groove to increase the eddy current of material.
Radiation cross-linking polyolefin foamed plastic extrusion granulating of the present invention, extruding-tablet screw, increased straight channel type barrier baffling section, not molten solid phase conductively-closed can not be passed through, and can impel solid phase fusion, simultaneously, material is divided into some strands by original banded laminar flow by straight trough, produces eddy current when entering and flow out the barrier groove, the materials flow direction change that produces therefrom, the redistribution of each several part material have promoted mixed effect; Being dispersed throughout the circumferential oblique slot type multiple-threaded screw shunting section in screw rod posterior segment can smash Solid Bed, destroy the molten bath, upset two-phase flow, and materials flow cut apart repeatedly, change the direction and the VELOCITY DISTRIBUTION of materials flow in the screw channel, solid phase and liquid phase are fully mixed, increase the heat transfer area between Solid Bed fragment and the melt, materials flow is produced certain resistance and friction shearing, and promote fusion; In addition, melt repeated segmentation, shunting are increased mixing, the homogenizing of material and the dispersiveness of additive, obtain low temperature and extrude by pin; Constriction shape annular groove places the junction of variant structural sections to strengthen the effect of eddy current.
By using proof, the generation of prefoam does not appear in the material favorable dispersibility that adopts the extruder of this kind form screw rod to extrude yet, and its foamed products abscess is even, fine and closely woven, and mechanical property promotes about 20%.
Description of drawings
Fig. 1 is the front view of embodiments of the invention one
Fig. 2 is the A-A profile of embodiments of the invention one
Fig. 3 is the B-B cutaway view of embodiments of the invention one
The specific embodiment
The present invention is further illustrated below in conjunction with embodiment, and following each embodiment only is used to illustrate technical scheme of the present invention, but to not restriction of invention.
Embodiment one
As shown in fig. 1, radiation cross-linking polyolefin foamed plastic extrusion granulating of the present invention, extruding-tablet screw, it be comprise uniform pitch subtract appearance formula conveying screw rod section, straight channel type barrier baffling section, constant volume type screw rod transmission section, oblique slot type multiple-threaded screw shunting section, constriction shape annular groove, be followed successively by spindle nose 1 from right to left, one subtracts appearance formula conveying screw rod section 2, one constriction shape annular groove 3, one straight channel type barrier pack stream section 4, a constriction shape annular groove 3 again, one constant volume type screw rod transmission section 5, staggered for alternate four sections constriction shape annular grooves 3 and three sections oblique slot type multiple-threaded screw shunting sections 6, connect a constant volume type screw rod transmission section 5 again, connect staggered again for alternate three sections constriction shape annular grooves 3 and three sections oblique slot type multiple-threaded screw shunting sections 6.Can find out that from figure subtracting appearance formula conveying screw rod section 2 is uniform pitch, in conjunction with Fig. 1 and Fig. 3 as can be known, straight channel type barrier baffling section 4 is to be made of a plurality of kinking passages 41 that are distributed in the screw rod surface, the kinking passage can be port of export sealing groove 41a, with the partition 41c of the 41b of groove in the same way of adjacent arrival end sealing, two grooves long and narrow nick shaped is set and overflows to stitch to be communicated with and form; By among Fig. 4 as can be known, oblique slot type multiple-threaded screw shunting section 6 is short bigger multiple-threaded screws of lead angle with respect to the conveying screw rod section.
During work, material is imported from the appearance formula conveying screw rod section 2 that subtracts of right-hand member, in the process of advancing, remove the space of storeroom through extruding gradually, fusion slowly simultaneously, after forming eddy current and change the former flow direction to first section constriction shape annular groove 3, enter straight channel type barrier baffling section 4, because the kinking passage 41 in this section straight channel type barrier baffling section 4, be provided with and become the passage that long and narrow nick shaped overflows and stitches, the material of fusion is passed through, fusion then has not been blocked, the material that flows through straight channel type barrier baffling section 4 enters back to back constriction shape annular groove 3, also having this passage is multichannel, the band shape of material has been divided into thread, enter the constriction shape annular groove 3 that is close to the exit, be incorporated in again again together, after constant volume type screw rod transmission section 5, be delivered to by staggered for alternate four sections constriction shape annular grooves 3 and three sections oblique slot type multiple-threaded screw shunting sections 6, through eddy current, scratch stream, shunt such triplicate again, after carrying by constant volume type screw rod transmission section 5 again, enter staggered again for alternate three sections constriction shape annular grooves 3 and three sections oblique slot type multiple-threaded screw shunting sections.
The screw rod of structure like this, not molten solid phase can not be passed through, and impel solid phase fusion, simultaneously, material is divided into some strands by original banded laminar flow by straight trough, produce eddy current when entering and flow out barrier groove and constriction shape annular groove, the materials flow direction that produces therefrom change, the redistribution of each several part material reach the raising of mixed effect.Coexist as a screw channel mutually and form two-phase flow at solid-liquid in the extrusion.Use the multiple-threaded screw passage, Solid Bed is smashed, destroy the molten bath, upset two-phase flow, and materials flow is cut apart repeatedly, change the direction and the VELOCITY DISTRIBUTION of materials flow in the screw channel, solid phase and liquid phase are fully mixed, increase the heat transfer area between Solid Bed fragment and the melt, materials flow is produced certain resistance and friction shearing, and promote fusion.In addition,, the decentralization of additive is promoted, and can realize that low temperature extrudes by melt repeated segmentation, shunting being increased mixing, homogenizing to material.
By using proof, auxiliary agent is favorable dispersibility in polyethylene, the generation of prefoam also do not occur, and its foamed products abscess is even, fine and closely woven, and mechanical property promotes about 20%.
Each section combination certainly of the present invention, length, the quantity in this screw rod of succession, section all can be different, and local structure also can change to some extent.
Claims (4)
1, a kind of radiation cross-linking polyolefin foamed plastic extrusion granulating, extruding-tablet screw, it is characterized in that: it comprises conveying screw rod section, slot type barrier baffling section, oblique slot type multiple-threaded screw shunting section, described slot type barrier baffling section is to be made of a plurality of kinking passages that are distributed in body of rod surface, and the kinking passage is that groove and the partition of groove in the same way that adjacent arrival end seals of port of export sealing is provided with long and narrow excessive seam and is communicated with and forms.
2, radiation cross-linking polyolefin foamed plastic extrusion granulating as claimed in claim 1, extruding-tablet screw is characterized in that: described conveying screw rod section has conveying screw rod section and the constant volume type screw rod transmission section that subtracts the appearance formula.
3, radiation cross-linking polyolefin foamed plastic extrusion granulating as claimed in claim 1 or 2, extruding-tablet screw is characterized in that: the junction of conveying screw rod section and slot type barrier baffling section, conveying screw rod section and oblique slot type multiple-threaded screw shunting section, slot type barrier baffling section and oblique slot type multiple-threaded screw shunting section, oblique slot type multiple-threaded screw shunting section and oblique slot type multiple-threaded screw shunting section is provided with constriction shape annular groove.
4, radiation cross-linking polyolefin foamed plastic extrusion granulating as claimed in claim 3, extruding-tablet screw is characterized in that: described subtract appearance formula conveying screw rod section be uniform pitch subtract appearance formula conveying screw rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100970348A CN1994722A (en) | 2005-12-31 | 2005-12-31 | Screw dedicated for extruding pelletizing and pelleting for radiation cross-linking polyolefin foamed plastic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100970348A CN1994722A (en) | 2005-12-31 | 2005-12-31 | Screw dedicated for extruding pelletizing and pelleting for radiation cross-linking polyolefin foamed plastic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1994722A true CN1994722A (en) | 2007-07-11 |
Family
ID=38249962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100970348A Pending CN1994722A (en) | 2005-12-31 | 2005-12-31 | Screw dedicated for extruding pelletizing and pelleting for radiation cross-linking polyolefin foamed plastic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1994722A (en) |
-
2005
- 2005-12-31 CN CNA2005100970348A patent/CN1994722A/en active Pending
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20070711 |