CN102650078B - Water-vapor sealed-type double-screw extruder - Google Patents
Water-vapor sealed-type double-screw extruder Download PDFInfo
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- CN102650078B CN102650078B CN201210078781.7A CN201210078781A CN102650078B CN 102650078 B CN102650078 B CN 102650078B CN 201210078781 A CN201210078781 A CN 201210078781A CN 102650078 B CN102650078 B CN 102650078B
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- screwing element
- screw extruder
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Abstract
The invention relates to a water-vapor sealed-type double-screw extruder, which is mainly used for the melt spinning of polyvinyl alcohol fiber adopting water as a plasticizer. The water-vapor sealed-type double-screw extruder comprises two screws (1), a jacket (2), a cooling bushing (3), a drive transmission system (4), a screw temperature control device (5) and a motor (6). The water-vapor sealed-type double-screw extruder is characterized in that a thread element of each screw at least consists of a thread element I (7), a thread element II (8) and a thread element III (9); the assembling way of the thread elements at least comprises at least one circulation of the thread element I, the thread element II and the thread element III and the thread element I is reconnected behind the circulation; or the thread element I is connected at least one circulation of the thread element II and the thread element III, and the thread element I is reconnected behind the circulation. Through the design of the screws, the water and vapor are sealed by utilizing the pressure difference, the proportion and viscosity of the spun molten material can be maintained, and the product quality can be improved.
Description
Technical field
The present invention relates to a kind of double screw extruder, particularly relate to a kind of water vapor seal type double screw extruder.
Background technology
Polyvinyl alcohol (PVA) is a kind of function admirable, broad-spectrum polymer.Conventional P VA fiber can pass through wet spinning, gel spinning manufacture, and these method operation more complicated, environmental pollution is larger.Owing to containing great amount of hydroxy group in polyvinyl alcohol molecule structure, can cause its fusing point and decomposition temperature to approach at a large amount of hydrogen bonds of large intermolecular formation, be difficult in theory use economy, efficient, the melt spinning method that environmental pollution is little.At present, researcher, by hydrogen bond between modifier water destruct polyvinyl alcohol molecule, limits its crystallization, has reduced its fusing point, has obtained the melt spinning process window of vinal.
In Polymer Processing equipment, screw extruder is one of the most important and the most outstanding equipment, at present, single screw extrusion machine, double screw extruder and multi-screw extruder have all been realized commercialization in industry, wherein, double screw extruder can be used as polyblend, a kind of continuous chemical reactor of polymer reaction, occupies again most important position, and its application is also more and more extensive.Double screw extruder generally can be divided into intermeshing co-rotating twin-screw extruder, intermeshing counter rotating twin screw extruder, non-engaging twin-screw extruder and conical double screw extruder etc.
Single screw extrusion machine, double screw extruder etc. have been obtained good effect in the processing and forming of thermoplastic.Described in Chinese patent CN1786302, adopt nitrogen-containing compound, hydrophily auxiliary additive and water and polyvinyl alcohol compound, carry out melt spinning, adopt general extruding-spinning equipment.Described in Chinese patent CN101899722, adopt the compound polyvinyl alcohol with low alcoholysis level of a small amount of water to carry out melt spinning, adopt common single screw extrusion machine.Described in Chinese patent CN102086535, the polyvinyl alcohol compound to water carried out freezing melt spinning, adopts common single screw extrusion machine.But, in the melt spinning process of polyvinyl alcohol, owing to containing a large amount of moisture content in melt, at single screw rod or twin-screw screw at high temp melting zone, under larger pressure, can evaporate a large amount of steam, steam can be from charge door against going out, polyvinyl alcohol and water ratio are uncontrollable within certain scope, melt viscosity cannot keep, and cannot obtain the vinal that performance is higher, and spinning even cannot be carried out smoothly.Above-mentioned patent can not solve this problem that polyvinyl alcohol faces in melt-spinning technology.
Summary of the invention
The invention provides a kind of water vapor seal type double screw extruder, object is to overcome under prior art double screw extruder for the deficiency of polyvinyl alcohol melt spinning, avoided the contrary of steam in polyvinyl alcohol melt spinning process to go out, steam has been played to the effect of sealing, keep the ratio of polyethylene alcohol and water in melt within the specific limits, guaranteed the carrying out of polyvinyl alcohol melt spinning.
The object of the invention is to be achieved through the following technical solutions.
Principle of the present invention is: design following screwing element, screwing element I has screw rod root footpath and the spiral groove depth being of moderate size; Screwing element II has larger screw rod root footpath, less spiral groove depth, and material has less flow herein, larger pressure; Screwing element III has compared with small screw root footpath, larger spiral groove depth, and material has larger flow herein, less pressure.Above three groups of screwing elements have identical external diameter and centre-to-centre spacing, according to screwing element I, screwing element II, the synthetic basic circulation section of der group of screwing element III, now, the screw channel place moderate pressure of screwing element I, pressure is P1, and the screw channel of screwing element II is in higher-pressure region, and pressure is P2, in the screw channel of screwing element III, in low-pressure area, pressure is P3.When steam is from screwing element II adverse current to screwing element II and during screwing element III junction, due to P3 < P2,, pressure differential cannot continue toward charging adverse current in the other direction steam, and vapor seal is achieved.
A kind of water vapor seal type double screw extruder of the present invention, comprise twin-screw, chuck, cooling cover, driving transmission system, extruder temperature control device and motor etc., the screwing element of described twin-screw has at least tri-kinds of screwing element I, screwing element II and screwing element III to combine; Combination at least comprises: be followed successively by least one circulation of screwing element I, screwing element II and screwing element III, and after described circulation, meet screwing element I again; Or combination comprises screwing element I, connect afterwards at least one circulation of screwing element II and screwing element III, and after described circulation, meet again screwing element I;
Described screwing element I, screwing element II and screwing element III meet following relation:
h
2S
2＜h
1S
1＜h
3S
3；
D
03＜D
01＜D
02；
Wherein said h
1for the spiral groove depth of screwing element I, S
1for the flight pitch of screwing element I, D
01screw rod root footpath for screwing element I; h
2for the spiral groove depth of screwing element II, S
2for the flight pitch of screwing element II, D
02screw rod root footpath for screwing element II; h
3for the spiral groove depth of screwing element III, S
3the flight pitch of screwing element III, D
03screw rod root footpath for screwing element III.
As preferred technical scheme:
A kind of water vapor seal type double screw extruder as above, described screwing element important technological parameters is as follows:
Screwing element I
Screw rod root footpath D
01>=15mm, spiral groove depth h
1>=15mm, flight pitch S
1>=10mm, spiral shell rib width B
1>=10mm;
Wherein, 0.3D
01≤ h
1≤ 0.6D
01, B
1≤ S
1;
Screwing element II
Screw rod root footpath D
02>=20mm, spiral groove depth h
2>=10mm, flight pitch S
2>=5mm, spiral shell rib width B
2>=5mm;
Wherein, 0.1D
02≤ h
2≤ 0.3D
02, B
2≤ S
2;
Screwing element III
Screw rod root footpath D
03>=10mm, spiral groove depth h
3>=20mm, flight pitch S
3>=10mm, spiral shell rib width: B
3>=10mm;
Wherein, 0.6D
03≤ h
3≤ 2D
03, B
3≤ S
3.
A kind of water vapor seal type double screw extruder as above, draw ratio 12≤L/D≤80 of described twin-screw.Screw slenderness ratio is an Important Parameters, and the draw ratio scope of dissimilar screw extruder is different.For the simple extruded product of technique and granulation, only need the smaller screw extruder of major diameter.When needs carry out the processing such as blend, filling, enhancing, reaction to polymer, sometimes need a plurality of charge doors, need to, compared with long residence time, just need to use the screw extruder that draw ratio is larger.
A kind of water vapor seal type double screw extruder as above, the centre-to-centre spacing A >=D-h of described twin-screw.Centre-to-centre spacing between two screw rods of double screw extruder is an important parameter, and he has determined Transmission System in Twin Screw Extruder output shaft, the size design in thrust bearing and screw rod external diameter and root footpath etc.For engagement type parallel double-screw, D-h≤A≤D, for non-engagement type parallel double-screw, general A=D, or A is slightly larger than D.
A kind of water vapor seal type double screw extruder as above, described D
03=0.5D
02=2/3D
01.For parallel double-screw extruder, each screwing element has identical external diameter, the production capacity size of having reacted to a great extent double screw extruder, screw rod root footpath and spiral groove depth have determined the size of the mass flow of screwing element part, can in twin-screw, set up different pressure distribution.
A kind of water vapor seal type double screw extruder as above, described h
1=0.4D
01, B
1=S
1.
A kind of water vapor seal type double screw extruder as above, described h
2=0.2D
02, B
2=S
2.
A kind of water vapor seal type double screw extruder as above, described h
3=D
03, 1.1S
3≤ B
3≤ 2S
3.
For engagement type double screw extruder, the size of flight pitch and spiral shell rib width has directly affected the engagement system of twin-screw, when flight pitch S equates with spiral shell rib width B, can produce the full engagement type twin-screw that portraitlandscape all seals, there is stronger mass transport ability.When flight pitch S is greater than spiral shell rib width B, can produce longitudinally or the twin-screw of sideways open, there is good mixing of materials ability.
Water vapor seal type screwing element combination of the present invention can be applicable to intermeshing co-rotating twin-screw extruder, intermeshing counter rotating twin screw extruder, non-engagement in the same way, counter rotation twin screw extruder and tapered double screw extruder etc., described water vapor seal type screwing element is applied to the object that above-mentioned double screw extruder can both be realized water vapor seal.
Beneficial effect
The present invention compared with prior art has the following advantages:
One, has compared with small screw root footpath, and the screwing element place mass flow of larger spiral groove depth is large, material at this section of screwing element everywhere in partly filling up state and thering is less pressure.Have larger screw rod root footpath, the screwing element place mass flow of less spiral groove depth is little and in filling up state, has larger pressure.Utilizing pressure differential to seal steam, is the brand-new design of making for polyvinyl alcohol melt-spinning process.
Its two, there is the double screw extruder of vapor seal function, can keep the material ratio of melt, keep the viscosity of melt, spinning is carried out smoothly, can improve the performance of product and the stability of product quality.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of water vapor seal type double screw extruder of the present invention
Fig. 2 is the local enlarged diagram of a kind of water vapor seal type double screw extruder screwing element of the present invention
Fig. 3 is the schematic diagram of the water vapor seal type double screw extruder of a kind of combination of the present invention
Fig. 4 is the schematic diagram of the water vapor seal type double screw extruder of another kind of combination of the present invention
Wherein, 1: twin-screw 2: chuck 3: cooling cover 4: drive transmission system 5: extruder temperature control device 6: motor 7: screwing element I 8: screwing element II 9: screwing element III
The specific embodiment
Below in conjunction with the specific embodiment, further set forth the present invention.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
A kind of water vapor seal type double screw extruder of the present invention, comprise twin-screw (1), chuck (2), cooling cover (3), drive transmission system (4), extruder temperature control device (5) and motor (6) etc., it is characterized in that: the screwing element of described twin-screw has at least (9) three kinds of screwing element I (7), screwing element II (8) and screwing element III to combine; Combination at least comprises: be followed successively by least one circulation of screwing element I (7), screwing element II (8) and screwing element III (9), and after described circulation, meet screwing element I (7) again; Or combination comprises screwing element I (7), connect afterwards at least one circulation of screwing element II (8) and screwing element III (9), and after described circulation, meet again screwing element I (7);
Described screwing element I (7), screwing element II (8) and screwing element III (9) meet following relation:
h
2S
2＜h
1S
1＜h
3S
3；
D
03＜D
01＜D
02；
Wherein said h
1for the spiral groove depth of screwing element I (7), S
1for the flight pitch of screwing element I (7), D
01screw rod root footpath for screwing element I (7); h
2for the spiral groove depth of screwing element II (8), S
2for the flight pitch of screwing element II (8), D
02screw rod root footpath for screwing element II (8); h
3for the spiral groove depth of screwing element III (9), S
3the flight pitch of screwing element III (9), D
03screw rod root footpath for screwing element III (9).
A kind of water vapor seal type double screw extruder as above, described screwing element important technological parameters is as follows:
Screwing element I (7)
Screw rod root footpath D
01>=15mm, spiral groove depth h
1>=15mm, flight pitch S
1>=10mm, spiral shell rib width B
1>=10mm;
Wherein, 0.3D
01≤ h
1≤ 0.6D
01, B
1≤ S
1;
Screwing element II (8)
Screw rod root footpath D
02>=20mm, spiral groove depth h
2>=10mm, flight pitch S
2>=5mm, spiral shell rib width B
2>=5mm;
Wherein, 0.1D
02≤ h
2≤ 0.3D
02, B
2≤ S
2;
Screwing element III (9)
Screw rod root footpath D
03>=10mm, spiral groove depth h
3>=20mm, flight pitch S
3>=10mm, spiral shell rib width B
3>=10mm;
Wherein, 0.6D
03≤ h
3≤ 2D
03, B
3≤ S
3;
A kind of water vapor seal type double screw extruder as above, draw ratio 12≤L/D≤80 of described twin-screw.
A kind of water vapor seal type double screw extruder as above, the centre-to-centre spacing A >=D-h of described twin-screw.
A kind of water vapor seal type double screw extruder as above, described D
03=0.5D
02=2/3D
01.
A kind of water vapor seal type double screw extruder as above, described h
1=0.4D
01, B
1=S
1.
A kind of water vapor seal type double screw extruder as above, described h
2=0.2D
02, B
2=S
2.
A kind of water vapor seal type double screw extruder as above, described h
3=D
03, 1.1S
3≤ B
3≤ 2S
3.
Fig. 1 is the schematic diagram of a kind of water vapor seal type double screw extruder of the present invention, and described water vapor seal type double screw extruder is comprised of twin-screw (1), chuck (2), cooling cover (3), driving transmission system (4), extruder temperature control device (5) and motor (6) etc.
Fig. 2 is the local enlarged diagram of a kind of water vapor seal type double screw extruder screwing element of the present invention, and described water vapor seal type double screw extruder screwing element part forms a basic circulation by the order of screwing element I (7), screwing element II (8), screwing element III (9).
Fig. 3 is the schematic diagram of the water vapor seal type double screw extruder of a kind of combination of the present invention, described combination is at least two circulations of screwing element I (7), screwing element II (8) and screwing element III (9), and after described circulation, meets screwing element I (7) again.
Fig. 4 is the schematic diagram of the water vapor seal type double screw extruder of another kind of combination of the present invention, described combination is screwing element I (7), connect afterwards at least two circulations of screwing element II (8) and screwing element III (9), and after described circulation, meet again screwing element I (7).
Claims (6)
1. a water vapor seal type double screw extruder, comprise twin-screw, chuck, cooling cover, driving transmission system, extruder temperature control device and motor, it is characterized in that: the screwing element of described twin-screw has at least three kinds of screwing element I, screwing element II and screwing element III to combine; Combination at least comprises: be followed successively by least one circulation of screwing element I, screwing element II and screwing element III, and after described circulation, connect screwing element I again; Or combination comprises screwing element I, connect afterwards at least one circulation of screwing element II and screwing element III, and after described circulation, connect again screwing element I;
Described screwing element I, screwing element II and screwing element III meet following relation:
h
2S
2＜h
1S
1＜h
3S
3；
D
03＜D
01＜D
02；
Wherein said h
1for the spiral groove depth of screwing element I, S
1for the flight pitch of screwing element I, D
01screw rod root footpath for screwing element I; h
2for the spiral groove depth of screwing element II, S
2for the flight pitch of screwing element II, D
02screw rod root footpath for screwing element II; h
3for the spiral groove depth of screwing element III, S
3the flight pitch of screwing element III, D
03screw rod root footpath for screwing element III;
Described screwing element important technological parameters is as follows:
Screwing element I
Screw rod root footpath D
01>=15mm, spiral groove depth h
1>=15mm, flight pitch S
1>=10mm, spiral shell rib width B
1>=10mm;
Wherein, 0.3D
01≤ h
1≤ 0.6D
01, B
1≤ S
1;
Screwing element II
Screw rod root footpath D
02>=20mm, spiral groove depth h
2>=10mm, flight pitch S
2>=5mm, spiral shell rib width B
2>=5mm;
Wherein, 0.1D
02≤ h
2≤ 0.3D
02, B
2≤ S
2;
Screwing element III
Screw rod root footpath D
03>=10mm, spiral groove depth h
3>=20mm, flight pitch S
3>=10mm, spiral shell rib width B
3>=10mm;
Wherein, 0.6D
03≤ h
3≤ 2D
03, B
3≤ S
3.
2. a kind of water vapor seal type double screw extruder according to claim 1, is characterized in that draw ratio 12≤L/D≤80 of described twin-screw.
3. a kind of water vapor seal type double screw extruder according to claim 1, is characterized in that, the centre-to-centre spacing A >=D-h of described twin-screw,
Wherein said D is screw diameter, and h is spiral groove depth.
4. a kind of water vapor seal type double screw extruder according to claim 1, is characterized in that described D
03=0.5D
02=2/3D
01.
5. a kind of water vapor seal type double screw extruder according to claim 1, is characterized in that described h
1=0.4D
01, B
1=S
1.
6. a kind of water vapor seal type double screw extruder according to claim 1, is characterized in that described h
2=0.2D
02, B
2=S
2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210078781.7A CN102650078B (en) | 2012-03-22 | 2012-03-22 | Water-vapor sealed-type double-screw extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210078781.7A CN102650078B (en) | 2012-03-22 | 2012-03-22 | Water-vapor sealed-type double-screw extruder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102650078A CN102650078A (en) | 2012-08-29 |
| CN102650078B true CN102650078B (en) | 2014-12-03 |
Family
ID=46692200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210078781.7A Expired - Fee Related CN102650078B (en) | 2012-03-22 | 2012-03-22 | Water-vapor sealed-type double-screw extruder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102650078B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107775937A (en) * | 2017-11-21 | 2018-03-09 | 南京科森挤出装备有限公司 | Changeable Lead becomes groove and becomes rib combined type supercharging thread bush |
| CN108527714A (en) * | 2018-05-04 | 2018-09-14 | 江苏睿博环保设备有限公司 | The preparation facilities of granules regeneration rubber |
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|---|---|---|---|---|
| US3599292A (en) * | 1967-07-17 | 1971-08-17 | Montedison Spa | Equipment for the injection molding of thermoplastic materials having a high content of volatile substances |
| US3655850A (en) * | 1969-10-30 | 1972-04-11 | Dart Ind Inc | Method for the continuous production of glass fiber reinforced thermoplastics |
| CN2334574Y (en) * | 1998-10-15 | 1999-08-25 | 北京化工大学 | Four-section type reaction extrusion screw bolt |
| CN2380373Y (en) * | 1999-06-17 | 2000-05-31 | 南京橡塑机械厂 | Head-variable diameter-changeable depth-variable combined screw arbor for parallel double-screw-arbor extruder |
| CN201366785Y (en) * | 2009-03-20 | 2009-12-23 | 韩旻 | Three-change screw rod with screw pitch, groove depth and groove width |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030016585A1 (en) * | 1998-05-06 | 2003-01-23 | Leveque Alain Yves | Low compression screw |
| US6328919B1 (en) * | 1999-02-16 | 2001-12-11 | The Dow Chemical Company | Method for extruding polycarbonate of low bulk density |
| US6513963B2 (en) * | 2001-01-19 | 2003-02-04 | Eastman Kodak Company | Multi-staged vented extrusion screw with dual channel depth pumping section |
| WO2010134208A1 (en) * | 2009-05-20 | 2010-11-25 | 日世株式会社 | Extruder, and method adapted to produce material for biodegradable foamed molding by using the extruder |
-
2012
- 2012-03-22 CN CN201210078781.7A patent/CN102650078B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3599292A (en) * | 1967-07-17 | 1971-08-17 | Montedison Spa | Equipment for the injection molding of thermoplastic materials having a high content of volatile substances |
| US3655850A (en) * | 1969-10-30 | 1972-04-11 | Dart Ind Inc | Method for the continuous production of glass fiber reinforced thermoplastics |
| CN2334574Y (en) * | 1998-10-15 | 1999-08-25 | 北京化工大学 | Four-section type reaction extrusion screw bolt |
| CN2380373Y (en) * | 1999-06-17 | 2000-05-31 | 南京橡塑机械厂 | Head-variable diameter-changeable depth-variable combined screw arbor for parallel double-screw-arbor extruder |
| CN201366785Y (en) * | 2009-03-20 | 2009-12-23 | 韩旻 | Three-change screw rod with screw pitch, groove depth and groove width |
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| Publication number | Publication date |
|---|---|
| CN102650078A (en) | 2012-08-29 |
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Granted publication date: 20141203 Termination date: 20170322 |