CN102650078A - Water-vapor sealed-type double-screw extruder - Google Patents
Water-vapor sealed-type double-screw extruder Download PDFInfo
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- CN102650078A CN102650078A CN2012100787817A CN201210078781A CN102650078A CN 102650078 A CN102650078 A CN 102650078A CN 2012100787817 A CN2012100787817 A CN 2012100787817A CN 201210078781 A CN201210078781 A CN 201210078781A CN 102650078 A CN102650078 A CN 102650078A
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- screwing element
- screw extruder
- type double
- water vapor
- seal type
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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, the gel spinning manufacturing, and these method operation more complicated, environmental pollution is bigger.Owing to contain great amount of hydroxy group in the polyvinyl alcohol molecular structure, can cause its fusing point and decomposition temperature approaching at a large amount of hydrogen bonds of big intermolecular formation, be difficult to use economy in theory, efficient, the melt spinning method that environmental pollution is little.At present, the researcher limits its crystallization through modifier water destruct polyvinyl alcohol intermolecular hydrogen bonding, 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 most important position again, and it is used also more and more widely.Double screw extruder generally can be divided into the intermeshing co-rotating twin-screw extruder, counter-rotating intermeshing double 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.Chinese patent CN1786302 is said, adopts nitrogen-containing compound, hydrophily auxiliary additive and water and polyvinyl alcohol compound, carries out melt spinning, adopts general extruding-spinning equipment.Chinese patent CN101899722 is said, adopts the compound polyvinyl alcohol with low alcoholysis level of low amounts of water to carry out melt spinning, adopts common single screw extrusion machine.Chinese patent CN102086535 is said, and the polyvinyl alcohol compound to water carried out freezing melt spinning, adopts common single screw extrusion machine.But, in the MELT SPINNING OF POLYVINYLALCOHOL process, owing to contain a large amount of moisture content in the melt; In single screw rod or twin-screw screw rod high-temperature fusion district, under big 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 can't keep, and can't obtain the higher vinal of performance, spinning even can't carry 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; Purpose is to overcome under prior art double screw extruder for the deficiency of polyvinyl alcohol melt spinning; Avoided the contrary of steam in the polyvinyl alcohol melt spinning process to go out; Steam has been played the effect that seals, and the ratio of polyethylene alcohol and water has guaranteed the carrying out of polyvinyl alcohol melt spinning within the specific limits in the maintenance melt.
The objective of the invention is to realize through following technical scheme.
Principle of the present invention is: design following screwing element, screwing element I has screw rod root footpath and the spiral groove depth that is of moderate size; Screwing element II has bigger screw rod root footpath, and less spiral groove depth, material have less flow herein, bigger pressure; Screwing element III has than small screw root footpath, and bigger spiral groove depth, material have bigger flow herein, less pressure.More than three groups of screwing elements have identical external diameter and centre-to-centre spacing, according to screwing element I, screwing element II; The der group of screwing element III is synthesized a basic circulation section, at this moment, and the screw channel place moderate pressure of screwing element I; Pressure is P1, and the screw channel of screwing element II is in the higher-pressure region, and pressure is P2; Be in low-pressure area in the screw channel of screwing element III, pressure is P3.When steam from screwing element II adverse current to screwing element II and during screwing element III junction because P3＜P2,, pressure differential makes steam can't continue toward charging adverse current in the other direction, 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 screwing element I, screwing element II and screwing element III to combine for three kinds; Compound mode comprises at least: be followed successively by at least one circulation of screwing element I, screwing element II and screwing element III, and after said circulation, meet screwing element I again; Perhaps compound mode comprises screwing element I, connects at least one circulation of screwing element II and screwing element III afterwards, and after said circulation, meets screwing element I again;
Relation below described screwing element I, screwing element II and screwing element III satisfy:
h
2S
2＜h
1S
1＜h
3S
3；
D
03＜D
01＜D
02；
Wherein said h
1Be the spiral groove depth of screwing element I, S
1Be the flight pitch of screwing element I, D
01Screw rod root footpath for screwing element I; h
2Be the spiral groove depth of screwing element II, S
2Be the flight pitch of screwing element II, D
02Screw rod root footpath for screwing element II; h
3Be 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 optimized technical scheme:
Aforesaid a kind of water vapor seal type double screw extruder, described screwing element important technological parameters is following:
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
Aforesaid a kind of water vapor seal type double screw extruder, draw ratio 12≤L/D≤80 of described twin-screw.Screw slenderness ratio is an important parameter, and the draw ratio scope of dissimilar screw extruders is different.For simple extruded product of technology and granulation, only need the less screw extruder of draw ratio.When needs carry out blend, filling, enhancing, reaction etc. and handle polymer, need a plurality of charge doors sometimes, need just need to use the bigger screw extruder of draw ratio than long residence time.
Aforesaid a kind of water vapor seal type double screw extruder, the centre-to-centre spacing A of described twin-screw >=D-h.Centre-to-centre spacing between two screw rods of double screw extruder is an important parameter, and he has determined double screw extruder transmission system output shaft, the size design in thrust bearing and screw rod external diameter and root footpath etc.For the 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.
Aforesaid a kind of water vapor seal type double screw extruder, described D
03=0.5D
02=2/3D
01For parallel double-screw extruder; Each screwing element has identical external diameter; Reacted the production capacity size of double screw extruder to a great extent, the screw rod root has directly then determined the size of the mass flow that screwing element is local with spiral groove depth, can in twin-screw, set up different pressure distribution.
Aforesaid a kind of water vapor seal type double screw extruder, described h
1=0.4D
01, B
1=S
1
Aforesaid a kind of water vapor seal type double screw extruder, described h
2=0.2D
02, B
2=S
2
Aforesaid a kind of water vapor seal type double screw extruder, described h
3=D
03, 1.1S
3≤B
3≤2S
3
For the engagement type double screw extruder; The size of flight pitch and spiral shell rib width has directly influenced 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, have stronger mass transport ability.As flight pitch S during greater than spiral shell rib width B, can produce vertically or the twin-screw of sideways open, have mixing of materials ability preferably.
Water vapor seal type screwing element combination of the present invention can be applicable to the intermeshing co-rotating twin-screw extruder; The counter-rotating intermeshing double 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 purpose 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 of which has than small screw root footpath, and the screwing element place mass flow of bigger spiral groove depth is big, material at this section screwing element everywhere in partly filling up state and having less pressure.Have bigger screw rod root footpath, the screwing element place mass flow of less spiral groove depth is little and be in the state of filling up, and has big pressure.Utilizing pressure differential that steam is sealed, is the brand-new design of making to the polyvinyl alcohol melt-spinning process.
Its two, the double screw extruder with vapor seal function can keep the material ratio of melt, keeps the viscosity of melt, and spinning is carried out smoothly, can improve the stability of performance of products and product quality.
Description of drawings
Fig. 1 is the sketch map 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 sketch map of the water vapor seal type double screw extruder of a kind of compound mode of the present invention
Fig. 4 is the sketch map of the water vapor seal type double screw extruder of another kind of compound mode 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 only to be used to the present invention is described and be not used in the restriction scope of the present invention.Should be understood that in addition those skilled in the art can do various changes or modification to the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion 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 screwing element I (7), screwing element II (8) and screwing element III to combine for (9) three kinds; Compound mode comprises at least: be followed successively by at least one circulation of screwing element I (7), screwing element II (8) and screwing element III (9), and after said circulation, meet screwing element I (7) again; Perhaps compound mode comprises screwing element I (7), connects at least one circulation of screwing element II (8) and screwing element III (9) afterwards, and after said circulation, meets screwing element I (7) again;
Described screwing element I (7), screwing element II (8) and screwing element III (9) satisfy following the relation:
h
2S
2＜h
1S
1＜h
3S
3；
D
03＜D
01＜D
02；
Wherein said h
1Be the spiral groove depth of screwing element I (7), S
1Be the flight pitch of screwing element I (7), D
01Screw rod root footpath for screwing element I (7); h
2Be the spiral groove depth of screwing element II (8), S
2Be the flight pitch of screwing element II (8), D
02Screw rod root footpath for screwing element II (8); h
3Be 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).
Aforesaid a kind of water vapor seal type double screw extruder, described screwing element important technological parameters is following:
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
Aforesaid a kind of water vapor seal type double screw extruder, draw ratio 12≤L/D≤80 of described twin-screw.
Aforesaid a kind of water vapor seal type double screw extruder, the centre-to-centre spacing A of described twin-screw >=D-h.
Aforesaid a kind of water vapor seal type double screw extruder, described D
03=0.5D
02=2/3D
01
Aforesaid a kind of water vapor seal type double screw extruder, described h
1=0.4D
01, B
1=S
1
Aforesaid a kind of water vapor seal type double screw extruder, described h
2=0.2D
02, B
2=S
2
Aforesaid a kind of water vapor seal type double screw extruder, described h
3=D
03, 1.1S
3≤B
3≤2S
3
Fig. 1 is the sketch map 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 made up 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 a basic circulation is formed by the order of screwing element I (7), screwing element II (8), screwing element III (9) in described water vapor seal type double screw extruder screwing element part.
Fig. 3 is the sketch map of the water vapor seal type double screw extruder of a kind of compound mode of the present invention; Described compound mode is at least two circulations of screwing element I (7), screwing element II (8) and screwing element III (9), and after said circulation, meets screwing element I (7) again.
Fig. 4 is the sketch map of the water vapor seal type double screw extruder of another kind of compound mode of the present invention; Described compound mode is screwing element I (7); Connect at least two circulations of screwing element II (8) and screwing element III (9) afterwards, and after said circulation, meet screwing element I (7) again.
Claims (8)
1. 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 screwing element I, screwing element II and screwing element III to combine for three kinds; Compound mode comprises at least: be followed successively by at least one circulation of screwing element I, screwing element II and screwing element III, and after said circulation, meet screwing element I again; Perhaps compound mode comprises screwing element I, connects at least one circulation of screwing element II and screwing element III afterwards, and after said circulation, meets screwing element I again;
Relation below described screwing element I, screwing element II and screwing element III satisfy:
h
2S
2＜h
1S
1＜h
3S
3；
D
03＜D
01＜D
02；
Wherein said h
1Be the spiral groove depth of screwing element I, S
1Be the flight pitch of screwing element I, D
01Screw rod root footpath for screwing element I; h
2Be the spiral groove depth of screwing element II, S
2Be the flight pitch of screwing element II, D
02Screw rod root footpath for screwing element II; h
3Be 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.
2. a kind of water vapor seal type double screw extruder according to claim 1 is characterized in that described screwing element important technological parameters is following:
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
3. a kind of water vapor seal type double screw extruder according to claim 1 and 2 is characterized in that draw ratio 12≤L/D≤80 of described twin-screw.
4. a kind of water vapor seal type double screw extruder according to claim 1 and 2 is characterized in that the centre-to-centre spacing A of described twin-screw >=D-h.
Wherein said D is a screw diameter, and h is a spiral groove depth.
5. a kind of water vapor seal type double screw extruder according to claim 1 and 2 is characterized in that described D
03=0.5D
02=2/3D
01
6. a kind of water vapor seal type double screw extruder according to claim 2 is characterized in that described h
1=0.4D
01, B
1=S
1
7. a kind of water vapor seal type double screw extruder according to claim 2 is characterized in that described h
2=0.2D
02, B
2=S
2
8. a kind of water vapor seal type double screw extruder according to claim 2 is characterized in that described h
3=D
03, 1.1S
3≤B
3≤2S
3
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 true CN102650078A (en) | 2012-08-29 |
| CN102650078B 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) |
Cited By (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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| 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 |
| WO2000048817A1 (en) * | 1999-02-16 | 2000-08-24 | The Dow Chemical Company | Method and apparatus for extruding polycarbonate material of low bulk density |
| US20020136084A1 (en) * | 2001-01-19 | 2002-09-26 | Eastman Kodak Company | Multi-staged vented extrusion screw with dual channel depth pumping section |
| US20030016585A1 (en) * | 1998-05-06 | 2003-01-23 | Leveque Alain Yves | Low compression screw |
| CN201366785Y (en) * | 2009-03-20 | 2009-12-23 | 韩旻 | Three-change screw rod with screw pitch, groove depth and groove width |
| JP2011000881A (en) * | 2009-05-20 | 2011-01-06 | Nissei Co Ltd | Extruder and method for producing 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 (9)
| 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 |
| US20030016585A1 (en) * | 1998-05-06 | 2003-01-23 | Leveque Alain Yves | Low compression screw |
| CN2334574Y (en) * | 1998-10-15 | 1999-08-25 | 北京化工大学 | Four-section type reaction extrusion screw bolt |
| WO2000048817A1 (en) * | 1999-02-16 | 2000-08-24 | The Dow Chemical Company | Method and apparatus for extruding polycarbonate material of low bulk density |
| 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 |
| US20020136084A1 (en) * | 2001-01-19 | 2002-09-26 | Eastman Kodak Company | Multi-staged vented extrusion screw with dual channel depth pumping section |
| CN201366785Y (en) * | 2009-03-20 | 2009-12-23 | 韩旻 | Three-change screw rod with screw pitch, groove depth and groove width |
| JP2011000881A (en) * | 2009-05-20 | 2011-01-06 | Nissei Co Ltd | Extruder and method for producing material for biodegradable foamed molding by using the extruder |
Cited By (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102650078B (en) | 2014-12-03 |
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Granted publication date: 20141203 Termination date: 20170322 |