CN204172318U - A kind of polyolefin extrusion screw rod - Google Patents
A kind of polyolefin extrusion screw rod Download PDFInfo
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- CN204172318U CN204172318U CN201420634436.1U CN201420634436U CN204172318U CN 204172318 U CN204172318 U CN 204172318U CN 201420634436 U CN201420634436 U CN 201420634436U CN 204172318 U CN204172318 U CN 204172318U
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Abstract
The utility model discloses a kind of polyolefin extrusion screw rod, its main body is provided with feeding section in turn, compression section, metering section, barrier screen and mixing section, wherein feeding section and metering section are single thread structure, compression section is provided with the different main thread of pitch and added thread, and on compression section, form the solid phase groove be connected with charging spout respectively and the liquid phase groove be connected with measuring tank, the external diameter of added thread is less than the external diameter of main thread, mask segments is provided with some feed auger blind slots to being surrounded by non-common screw thread and shared screw thread respectively and discharging spiral blind slot, separate by sharing screw thread between often pair of feed auger blind slot and discharging spiral blind slot, and the entrance of feed auger blind slot is connected with measuring tank, the outlet of discharging spiral blind slot is connected with mixing section, the external diameter sharing screw thread is less than the external diameter of non-common screw thread, mixing section is provided with parallel double wedge, the length of screw rod is 42 times of outer screw diameter.Screw speed of the present utility model is high, and output is high, and plasticizing quality is good.
Description
Technical field
The utility model relates to a kind of plastic extrusion facility, especially relates to the extrusion screw rod of polyolefin extrusion molding.
Background technology
Accompanying drawing 1 is the structural representation of existing common polyolefin extrusion screw rod, its screw rod is single thread structure, comprise bringing-up section 1, compression section 2, metering section 3 and screw head 4, when plastics enter barrel from hopper, under screw rod turning effort, feeding section 1 is fed forward to by material tube inner wall and the effect of screw surface fricting shearing, be fed forward at this loose solid and be compacted simultaneously and enter compression section 2, the spiral groove depth of compression section 2 shoals, solid material is by further compacting, simultaneously at barrel external heat, and under screw rod and the effect of material tube inner wall fricting shearing, material heats up and starts melting, material after melting enters metering section 3 and to distribute homogenizing, the quantitative level pressure of constant temperature go out extrusion plastic melt from screw head 4.
The draw ratio of extrusion screw rod conventional mostly at present is the specification being less than 36, its output receives head pressure obvious effect, plastic extrusion fluctuation is large, and especially under high head pressure, screw rod output obviously declines, production efficiency is lower, output fluctuation is large, and material melts efficiency is low in addition, and homogenization degree is poor, melting effect is bad, and constant product quality is poor.
Summary of the invention
The purpose of this utility model be to provide a kind of melting efficiency high, plastify even, mixing evenly and the polyolefin extrusion screw rod of stable yield.
Technical solution of the present utility model is: a kind of polyolefin extrusion screw rod, along being fed to screw head direction, its main body is provided with feeding section in turn, compression section, metering section, barrier screen and mixing section, wherein feeding section is provided with the charging spout that single thread is formed, metering section is provided with the measuring tank that single thread is formed, compression section is provided with the different main thread of pitch and added thread, and on compression section, form the solid phase groove be connected with charging spout respectively and the liquid phase groove be connected with measuring tank, the external diameter of added thread is less than the external diameter of main thread, mask segments is provided with some feed auger blind slots to being surrounded by non-common screw thread and shared screw thread respectively and discharging spiral blind slot, separate by sharing screw thread between often pair of feed auger blind slot and discharging spiral blind slot, and the entrance of feed auger blind slot is connected with measuring tank, the outlet of discharging spiral blind slot is connected with mixing section, the external diameter sharing screw thread is less than the external diameter of non-common screw thread, mixing section is provided with parallel double wedge, the effective length of screw rod is 42 times of outer screw diameter.
Compression section is provided with main thread and added thread, thus form on its surface the solid phase groove communicated with charging spout, and the liquid phase groove to communicate with measuring tank, therefore, the solid-phase material entered from charging spout can enter compression section smoothly, can not produce charging and hinder, simultaneously under screw rod runs up lower and barrel external heat, climb over added thread after the melting of solid-phase material major part and enter liquid phase groove, the solid-phase material of a small amount of non-melting also can enter in metering section smoothly, strong shearing force can not be produced and hinder charging, improve the fusion plastification effect of material in barrel, and the material in solid phase groove can continue to be heated, increase the heat exchange area of solid-phase material, shorten melting length and relative reduction melt temperature on the whole, be conducive to low temperature to extrude, avoid material overheated, the helicla flute arranged in mask segments, the promotion effect to material can be strengthened, shared screw thread can stop that the solid-phase material of non-melting enters discharging, simultaneously can by shear and friction impels solid-phase material melting or plasticizing, melt can be broken up destruction by the double wedge of mixing section, upset the flowing of solid phase and liquid phase material, be material repeatedly by separately and converge, increase mixing to material, homo-effect, improve the dispersiveness of additive, improve mixing uniformity, in addition longer screw rod can ensure the time of staying of material in barrel, it is made also can fully to plastify at high speeds.
Identical with described charging spout width at the width of the described solid phase groove of described feeding section side, at 0.1-0.3 times that the described solid phase well width of described metering section side is described measuring tank width, be 2-5mm at the described liquid phase well width of described feeding section side, at 0.7-0.9 times that the described liquid phase well width of described metering section side is described measuring tank width, the external diameter 0.5-1.5mm less of described main thread external diameter of described added thread.Solid phase well width reduces gradually, and liquid phase well width increases gradually, effectively can improve the stability that material runs in screw rod, be conducive to running up.
Described main thread width is 0.05 ~ 0.09 times of outer screw diameter, and described added thread width is 0.04 ~ 0.07 times of outer screw diameter, and length is 10 ~ 20 times of outer screw diameter.Be conducive to ensureing that main thread promotes solid material and moves and impel its melting, the solid material of convenient melting is simultaneously separated by added thread.
The orthogonal cross-sectional shape of described feed auger blind slot and described discharging spiral blind slot is semicircle, half elliptic, U-shaped or trapezoidal.
The external diameter 0.5-2mm less of the external diameter of described non-common screw thread of described shared screw thread.Fully can carry out shearing friction to solid-phase material, larger resistance can be avoided the formation of again simultaneously, ensure the smooth and easy of material communication.
The trench bottom of described feed auger blind slot is concordant with described measuring tank bottom land, and the bottom of described discharging spiral blind slot is concordant with the root of described double wedge.Facilitate charging and discharging.
The cross sectional shape of described double wedge is rectangle, circle, square, rhombus or trapezoidal.Be applicable to the occasion of different material extrusion plasticizing.
The utility model has the advantages that: feeding section adopts one start screw, improves charging capability, compression section adopts the double thread structure optimized, and enhances fusion plastification effect, improves the clogging of material in compression section, improve plasticizing capacity.Barrier screen adopts several to helical groove structure, strengthens fusion plastification and mixed effect, and adds the progradation to material, thus decrease the impact of head pressure on feeding section charging capability.Mixing section adopts convex tooth type structures, and the distributed rendering ability of screw rod is strengthened, and improves that the uniformity on direction in length and breadth, melting effect are good, good dispersion.Extrusion screw rod takes large draw ratio, can improve the rotating speed of screw rod, thus improves extrusion capacity.The polyolefin products that high rotating speed, high yield, plasticizing quality are good, accurate measurement, low temperature are extruded can be obtained.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of extrusion screw rod in prior art;
Accompanying drawing 2 is the structural representation of the utility model embodiment;
Accompanying drawing 3 is the structural representation of compression section in the utility model embodiment;
Accompanying drawing 4 is the structural representation of barrier screen in the utility model embodiment;
Accompanying drawing 5 is the structural representation of mixing section in the utility model embodiment;
1, feeding section, 2, compression section, 3, metering section, 4, screw head, 5, feeding section, 51, charging spout, 6, compression section, 61, liquid phase groove, 62, solid phase groove, 63, main thread, 64, added thread, 7, metering section, 71, measuring tank, 8, barrier screen, 81, share screw thread, 82, feed auger blind slot, 83, discharging spiral blind slot, 84, non-common screw thread, 9, mixing section, 91, double wedge, 10, screw head.
detailed description of the invention
Embodiment:
Consult Fig. 2-5, a kind of polyolefin extrusion screw rod, along being fed to screw head 10 direction, its main body is provided with feeding section 5 in turn, compression section 6, metering section 7, barrier screen 8 and mixing section 9, wherein feeding section 5 is provided with the charging spout 51 that single thread is formed, metering section 7 is provided with the measuring tank 71 that single thread is formed, compression section 6 is provided with the different main thread of pitch 63 and added thread 64, and on compression section 6, form the solid phase groove 62 be connected with charging spout 51 respectively and the liquid phase groove 61 be connected with measuring tank 71, the external diameter of added thread 64 is less than the external diameter of main thread 63, mask segments 8 is provided with some feed auger blind slots 82 to being surrounded by non-common screw thread 84 and shared screw thread 81 respectively and discharging spiral blind slot 83, separate by sharing screw thread 81 between often pair of feed auger blind slot 82 and discharging spiral blind slot 83, and the entrance of feed auger blind slot 82 is connected with measuring tank 71, the outlet of discharging spiral blind slot 83 is connected with mixing section 9, the external diameter sharing screw thread 81 is less than the external diameter of non-common screw thread 84, mixing section 9 is provided with parallel double wedge 91.
Wherein, the effective length of this screw rod is 42 times of outer screw diameter, material adopts the wear-resisting nitrated steel 38CrMoAlA of high-quality to manufacture, the surface carburization of screw rod, nitrided case depth is 0.5 ~ 0.7mm, hardness is HV950 ~ 1100, and surface roughness is 0.4 μm, makes smooth being not easy of the internal face of runner wear and tear and make material easily movement.The form of screw head 10 is globular model screw head.
Feeding section 5 adopts one start screw to design, and pitch is equal with outer screw diameter, and pitch is constant, major diameter of thread is constant, and footpath, charging spout 51 end is constant, and charging spout 51 degree of depth is 0.09 ~ 0.15 times of outer screw diameter, the width of thread is 0.06 ~ 0.1 times of outer screw diameter, and feeding section 5 length is 5 ~ 9 times of outer screw diameter.
See Fig. 3, compression section 6 adopts double thread to design, and wherein solid phase groove 62 is connected with the charging spout 51 of feeding section 5, and liquid phase groove 61 is connected with the measuring tank 71 of metering section 7.Solid phase groove 62 width in feeding section 5 side and charging spout 51 wide, be 0.1 ~ 0.3 times of measuring tank 71 width at solid phase groove 62 width of metering section 7 side, the degree of depth of solid phase groove 62 is reduced in measuring tank 71 grade dark by charging spout 51 grade deeply gradually; The width of liquid phase groove 61 is increased to 0.7 ~ 0.9 times of measuring tank 71 width gradually by the 3-6mm of feeding section 5 side, the degree of depth of liquid phase groove 61 is increased to measuring tank 71 grade dark by the major diameter of thread of added thread 63.Major diameter of thread 0.4 ~ the 0.9mm less of the major diameter of thread of main thread 64 of added thread 63.Main thread 64 still plays a part to promote solid plastics and advances and impel solid plastics melting, and added thread 63 makes the melt that melted and solid plastics separately; Main thread 64 width of compression section 6 is 0.05 ~ 0.09 times of outer screw diameter, and added thread 63 width is 0.04 ~ 0.07 times of outer screw diameter, and length is 10 ~ 20 times of outer screw diameter.
Metering section 7 adopts one start screw to design, and lead angle is 25 ~ 35 °, and major diameter of thread is constant, footpath, measuring tank 71 end is constant, and the degree of depth is 0.03 ~ 0.09 times of outer screw diameter, and the width of thread is 0.07 ~ 0.13 times of outer screw diameter, pitch is constant, and metering section 7 total length is 8 ~ 13 times of outer screw diameter.
As shown in Figure 4, the face of cylinder of barrier screen 8 is equidistantly opened even number (6 ~ 24), lead angle has been the helicla flute of 50 ~ 70 °, wherein feed auger blind slot 82 is communicated with measuring tank 71, and its bottom land is concordant with measuring tank 71, discharging spiral blind slot 83 communicates with mixing section 9, and its bottom land is concordant with double wedge 91 root of mixing section 9; These two groups of spiral blind slots separate by sharing screw thread 81, and both sides are respectively non-common screw thread 84.Share screw thread 81 external diameter 0.4 ~ 1.3mm less of non-common screw thread 84 external diameter, the width of thread is 4 ~ 10mm, and barrier screen 8 length is 3 ~ 8 times of outer screw diameter.The cross sectional shape of feed auger blind slot 82 and discharging spiral blind slot 83 can be semicircle, half elliptic, U-shaped, trapezoidal.
As shown in Figure 5, the face of cylinder of the mixing section 9 of screw rod equidistantly opens double wedge 91 that is several and axis being parallel, be 4 ~ 30 in the number of screw rod circumferentially annular array, the row that screw axial arranges is 4 ~ 10 row, and mixing section 9 length is 4 ~ 8 times of major diameter of threads.The cross sectional shape of double wedge 91 can be rectangle, circle, square, rhombus or trapezoidal, and this form is convenient to processing, and processing cost is lower.
Operation principle and the course of work of the present embodiment are described in detail in detail below in conjunction with said structure:
Material enters the feeding section 5 of screw rod from hopper, under screw speed effect, is pushed to screw head 10 gradually and is compacted, simultaneously melting gradually under the shearing and external heater effect of screw rod and barrel.In the compression section 6 of screw rod, material starts melting in course of conveying, under the rotary action of screw rod, the material of melting is crossed added thread 63 and is entered liquid phase groove 61, and the solids of non-melting are blocked by added thread 63, still, in solid phase groove 62, the material of melting and the feed separation of non-melting is realized; , an in-built solid plastic of thread groove, the in-built molten plastic of another thread groove, the shearing be subject to regard to making the plastics of melting reduces; Simultaneously, solid phase groove 62 is communicated with metering section 7, also do not have a small amount of material of melting can not be subject to suddenly strong shearing force and hinder the reinforced of screw thread, the charging capability that material heats up and reduces screw rod can not be produced, thus realize low temperature and extrude and high yield, guarantee the stable of melt pressure and output, this also provides condition for realizing running up of screw rod.
At metering section 7, melt, under the promotion of screw thread, sets up the pressure of melt, accurate as measuring pump, quantitative melt conveying material, increases and just flows, and reduces pressure current and leakage current, make to plastify more fully evenly.
At barrier screen 8, share on the one hand screw thread 81 and stop that a certain size solid phase is passed through, the shearing making it stay to continue to stand screw thread in feed auger blind slot 82, extruding or heating, impel melting; Share on the other hand screw thread 81 and carry out stronger shearing to the material crossing shared screw thread 81, material is got back further melting or plasticizing; The material crossing shared screw thread 81 produces eddy motion in discharging spiral blind slot 83, and material is got back mixing.These are sheared and mechanical energy is heat energy by mixing, thus the melting homogenizing of strength imparting material.When material flows through shared screw thread 81, each interlayer of stream has larger speed difference, produces interlayer slip and produces frictional heat, thus facilitating the plasticizing of material; Material is when entering feed auger blind slot 82, material is divided into some stocks by banded laminar flow, when flowing out discharging spiral blind slot 83, material is merged together by some stocks, such stream easily produces eddy current, the direction producing stream changes, each several part material redistribution mixing, is conducive to the dispersion of additive and look mother.
At mixing section 9, that solid material is smashed by double wedge 91 on the one hand, destroy melt, upset the two-phase flow of solid and liquid, and stream is separated repeatedly, change the direction of stream between barrel and screw rod and VELOCITY DISTRIBUTION, solid phase and liquid phase are fully mixed, increase the heat transfer area between solid phase and liquid phase, and certain resistance and fricting shearing are produced to material, make solid phase fusion; On the other hand material is carried out repeated segmentation, shunting and the dispersiveness that increases mixing, the homogenizing of material and additive, look mother.
The polyolefin extrusion screw rod of the present embodiment, the structural design of its compression section, can not play inhibition to solid-state stream, the plastics of melting and solid plastic can be separated, accommodating solid plastic in a thread groove; Accommodating molten plastic in another thread groove, the shearing making the plastics of melting be subject to like this reduces, and avoids molten plastic be subject to high temperature and decompose, and guarantees the stable of melt pressure and output; At barrier screen, do not have fused materials and the larger solid phase fragment of granularity not by barrier, the shearing or heating that make it stay in helicla flute to continue to stand screw thread, impel melting; The material of melting and the less solid phase fragment of granularity are when by barrier, and be subject to having comparatively strong shear action and certain shear-mixed, material obtains further melting or plasticizing; At mixing section, the mixing of solid phase and liquid phase can be strengthened, the mixed effect of reinforced plastics and other additives.Extrusion screw rod has large draw ratio, can high-speed rotation, and plasticizing quality and output promote greatly, and then effectively can shorten the time of staying of material in barrel, greatly enhance productivity.
Above-listed detailed description is illustrating for one of the utility model possible embodiments, this embodiment is also not used to limit the scope of the claims of the present utility model, allly do not depart from the equivalence that the utility model does and implement or change, all should be contained in the scope of the claims of this case.
Claims (7)
1. a polyolefin extrusion screw rod, it is characterized in that: along being fed to screw head direction, its main body is provided with feeding section in turn, compression section, metering section, barrier screen and mixing section, wherein feeding section is provided with the charging spout that single thread is formed, metering section is provided with the measuring tank that single thread is formed, compression section is provided with the different main thread of pitch and added thread, and on compression section, form the solid phase groove be connected with charging spout respectively and the liquid phase groove be connected with measuring tank, the external diameter of added thread is less than the external diameter of main thread, mask segments is provided with some feed auger blind slots to being surrounded by non-common screw thread and shared screw thread respectively and discharging spiral blind slot, separate by sharing screw thread between often pair of feed auger blind slot and discharging spiral blind slot, and the entrance of feed auger blind slot is connected with measuring tank, the outlet of discharging spiral blind slot is connected with mixing section, the external diameter sharing screw thread is less than the external diameter of non-common screw thread, mixing section is provided with parallel double wedge, the length of screw rod is 42 times of outer screw diameter.
2. a kind of polyolefin extrusion screw rod according to claim 1, it is characterized in that: identical with described charging spout width at the width of the described solid phase groove of described feeding section side, at 0.1-0.3 times that the described solid phase well width of described metering section side is described measuring tank width, be 2-5mm at the described liquid phase well width of described feeding section side, at 0.7-0.9 times that the described liquid phase well width of described metering section side is described measuring tank width, the external diameter 0.5-1.5mm less of described main thread external diameter of described added thread.
3. a kind of polyolefin extrusion screw rod according to claim 2, is characterized in that: described main thread width is 0.05 ~ 0.09 times of outer screw diameter, and described added thread width is 0.04 ~ 0.07 times of outer screw diameter, and length is 10 ~ 20 times of outer screw diameter.
4. a kind of polyolefin extrusion screw rod according to claim 1 or 2 or 3, is characterized in that: the orthogonal cross-sectional shape of described feed auger blind slot and described discharging spiral blind slot is semicircle, half elliptic, U-shaped or trapezoidal.
5. a kind of polyolefin extrusion screw rod according to claim 4, is characterized in that: the external diameter 0.5-2mm less of the external diameter of described non-common screw thread of described shared screw thread.
6. a kind of polyolefin base screw rod according to claim 5, is characterized in that: the trench bottom of described feed auger blind slot is concordant with described measuring tank bottom land, and the bottom of described discharging spiral blind slot is concordant with the root of described double wedge.
7. a kind of polyolefin extrusion screw rod according to claim 5, is characterized in that: the cross sectional shape of described double wedge is rectangle, circle, square, rhombus or trapezoidal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420634436.1U CN204172318U (en) | 2014-10-29 | 2014-10-29 | A kind of polyolefin extrusion screw rod |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420634436.1U CN204172318U (en) | 2014-10-29 | 2014-10-29 | A kind of polyolefin extrusion screw rod |
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| CN204172318U true CN204172318U (en) | 2015-02-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104354284A (en) * | 2014-10-29 | 2015-02-18 | 佛山市日丰企业有限公司 | Polyolefin extrusion screw |
| CN106696243A (en) * | 2015-07-27 | 2017-05-24 | 上海贝阳塑料机械科技有限公司 | PVC thermal contraction film blowing machine |
| CN108645101A (en) * | 2018-07-30 | 2018-10-12 | 广东顺德安和磁性制品有限公司 | A kind of PVC dumb lights seal strip for refrigerator door and its production method |
| CN111052264A (en) * | 2017-08-01 | 2020-04-21 | 耐克森公司 | Method for manufacturing a cable by extruding a composition based on a propylene polymer and a dielectric liquid |
-
2014
- 2014-10-29 CN CN201420634436.1U patent/CN204172318U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104354284A (en) * | 2014-10-29 | 2015-02-18 | 佛山市日丰企业有限公司 | Polyolefin extrusion screw |
| CN106696243A (en) * | 2015-07-27 | 2017-05-24 | 上海贝阳塑料机械科技有限公司 | PVC thermal contraction film blowing machine |
| CN111052264A (en) * | 2017-08-01 | 2020-04-21 | 耐克森公司 | Method for manufacturing a cable by extruding a composition based on a propylene polymer and a dielectric liquid |
| CN111052264B (en) * | 2017-08-01 | 2021-09-21 | 耐克森公司 | Method for manufacturing a cable by extruding a composition based on a propylene polymer and a dielectric liquid |
| CN108645101A (en) * | 2018-07-30 | 2018-10-12 | 广东顺德安和磁性制品有限公司 | A kind of PVC dumb lights seal strip for refrigerator door and its production method |
| CN108645101B (en) * | 2018-07-30 | 2024-06-18 | 广东顺德安和密封新材料科技有限公司 | PVC matte refrigerator door seal bar and production method thereof |
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Address after: 528000 Guangdong province Foshan City Temple Road No. 16 HSBC Building 8 floor Patentee after: RIFENG ENTERPRISE GROUP CO., LTD. Patentee after: WENZHOU RIFENG TECHNOLOGY CO., LTD. Address before: 528000 Guangdong province Foshan City Temple Road No. 16 HSBC Building 8 floor Patentee before: Rifeng Enterprise Co., Ltd., Foshan Patentee before: Foshan market day rich science and technology in enterprise company limited |