CN1559783A - Multi-step double-screw rod extruder - Google Patents
Multi-step double-screw rod extruder Download PDFInfo
- Publication number
- CN1559783A CN1559783A CNA2004100186651A CN200410018665A CN1559783A CN 1559783 A CN1559783 A CN 1559783A CN A2004100186651 A CNA2004100186651 A CN A2004100186651A CN 200410018665 A CN200410018665 A CN 200410018665A CN 1559783 A CN1559783 A CN 1559783A
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- screw
- screw rod
- extruder
- internal diameter
- double
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
A multi-step dual-screw extruder for high-molecular material or its mixturefeatures that external diameter of screw bolt and the internal diameter of screw bolt's sleeve pipe for its plasticizing segment are greater than those for delivery segment but less than those for homogenizing segment and metering segment, and the internaldiameter of screw bolt for plasticizing segment is less than that for delivery segment but greater than that of homogenizing and metering segments.
Description
Technical field
The invention belongs to macromolecular material manufacturing and contour machining equipment field, relate to the extrusion device of a kind of macromolecular material or its mixture manufacturing or processing and forming, particularly a kind of multi-functional multiple stage type double screw extruder.
Background technology
Extruder is the important plant equipment of macromolecular material manufacturing and processing and forming, dividing has single screw extrusion machine, double screw extruder, multi-screw extruder etc., the screw rod of these extruders and machine barrel (screw sleeve)/fuselage can be that combined type also can be a monoblock type, but generally be equalization or gradual change directly within footpath and the machine barrel outside the screw rod in every kind of extruder, as conical screw extruder.In order to process or make some macromolecular material or its mixture, people have invented that screw pitch equates that footpath, the end do not wait and/or pitch does not wait the directly equal screw extruder in the end or contain the extruder of various functional sections.
Along with science and technology development, the macromolecular material that some is novel can not or be difficult to make or processing and forming with above-mentioned traditional extruder such as the pulverous macromolecular material of some thermal sensitivitys.Therefore people have invented the device that is chained together with two extruders, such as double screw extruder-single screw extrusion machine device, that is: raw material add from the charge door of double screw extruder, enter single screw extrusion machine through twin-screw running plasticizing, fusion, exhaust etc., avoid machine inner macromolecule material overheated, exporting out from single screw extrusion machine again becomes product or semi-finished product.But this device needs two machines, two cover control systems and two cover drive units, and floor space is big, and investment is big, the power consumption height, so production cost is higher.
German patent DE 8449678 discloses a kind of double screw extruder, the screw rod external diameter of this extruder and end footpath/machine barrel internal diameter are not wait, but by charging aperture here the screw rod external diameter of section and machine barrel internal diameter than cross-head section big here, this design causes the inventory of extruder back segment (charging aperture here) greater than leading portion (head here), cause that material increases at advance deflation of process experience and pressure, make in the extruder material be difficult for being evacuated in exhaust and the material void gas or moisture is difficult for being overflowed, so that the final products performance is not good.
United States Patent (USP) 2003219507 (priority number: Deutsche Bundespatent 20021016754) disclose a kind of injection molding double screw extruder that is used for, it is characterized by extrusion device is made up of fluxing zone and metering section, wherein the screw rod sectional area of metering section is greater than the screw rod sectional area of fluxing zone, and the metering section function is that admittance and storage, the past head of continuation then transport the melt from fluxing zone.But, this application prospectus fails to define the footpath, the end of screw rod, when footpath (although also satisfying the feature of extrusion device in this patent) at the bottom of footpath at the bottom of the screw rod of metering section is greater than the screw rod of fluxing zone, from the melt of fluxing zone and be difficult for being stored in metering section, moreover that the melt in this metering section easily produces is overheated.Moreover it is simple that the disclosed extrusion device structure of this patent is crossed what, is unsuitable for complicated macromolecular material system, such as the manufacturing or the processing and forming of the polymerisation of devolatilization drying.
Summary of the invention
The objective of the invention is to overcome above-mentioned shortcomings and deficiencies, a kind of technical scheme of multiple stage type double screw extruder is provided.
The multiple stage type double screw extruder that the present invention relates to has transportation section/fluxing zone, homogenizing zone and metering section, it is characterized in that: outer warp of the screw rod of its fluxing zone and screw sleeve internal diameter are more than or equal to outer warp of the screw rod of transportation section and screw sleeve internal diameter, outer warp of the screw rod of little what homogenizing zone and metering section and screw sleeve internal diameter, the footpath is smaller or equal to warp at the bottom of the screw rod of transportation section, greater than footpath at the bottom of the screw rod of homogenizing zone and metering section at the bottom of the screw rod of its fluxing zone.
Transportation section/the fluxing zone that the present invention relates to has mass transport and shearing usefulness efficiently, and homogenizing zone and metering section make this section material have bigger bath surface and lower shear energy because of footpath and bigger screw rod external diameter/screw sleeve internal diameter at the bottom of the less screw rod are arranged.Thereby guaranteed that material enters homogenizing zone/metering section by the rapid devolatilization aqueous vapor of large tracts of land exhaust after high speed shear, made the material melt obtain better homogenizing simultaneously, and avoid producing overheated.
Another advantageous embodiments of the present invention is, makes long polymer of some induced and reaction time, and it also is favourable taking the outer warp of screw rod of fluxing zone and the outer warp of screw rod and the screw sleeve internal diameter of the little what of screw sleeve internal diameter transportation section.
The extruder screw that the present invention relates to can be processed by split air conditioner, and recombinant is mounted to one, and screw sleeve (being machine barrel/fuselage) also can be processed by split air conditioner, and recombinant is mounted to one.
The present invention's feature of an advantageous embodiments again is, when the geometry of screw rod or screw sleeve was simple, screw rod or screw sleeve can be machined to monoblock type simply.
Description of drawings
Accompanying drawing is the rough schematic that multiple stage type double screw extruder involved in the present invention is implemented in expression.
The specific embodiment
The specific embodiment of the multiple stage type double screw extruder of macromolecular material involved in the present invention or manufacturing of its mixture or processing and forming is described in detail as follows with reference to accompanying drawing:
Multiple stage type double screw extruder involved in the present invention is mainly by containing transportation section (100), fluxing zone (200), the screw sleeve (4) of homogenizing zone/metering section (300) and screw rod (5) composition.The screw rod of its fluxing zone (200) is outer outer through (51) and screw sleeve internal diameter (41) more than or equal to the screw rod of transportation section (100) through (52) and screw sleeve internal diameter (42), outer less than the screw rod of homogenizing zone/metering section (300) through (53) and screw sleeve internal diameter (43), at the bottom of the screw rod of its fluxing zone (200) footpath (56) smaller or equal to the screw rod of transportation section (100) at the bottom of through (55), greater than footpath (57) at the bottom of the screw rod of homogenizing zone/metering section (300).
The extruder that the present invention relates to of band heater (not shown) reach temperature required after, multiple material separately or is in advance mixed the back adds charge door (3) or (contain two kinds) that mixtures of material adds at charge door (3) with a kind of macromolecular material or more than two kinds.When system contained filler, filler was then extruded drawing-in device (not shown) by twin-screw and is extruded drawing-in device (not shown) or auxilliary charging aperture (61) adding in the upper end of natural cutting mode in side-feed (6) or by single screw rod.
Under the rotation of screw rod (5) drives, material constantly moves towards screw tip, carry fast (100) through the transportation section, enter fluxing zone (200), experience high shear and plastifying fusion progressively enter homogenizing zone/metering section (300), in this section material bath surface increase, or/and vacuum extractor of (8) (not shown) or natural exhaust, and constantly extruded outlet of extruder after the homogenizing by escape vents (7).
Claims (6)
1. a macromolecular material or its mixture are made or the double screw extruder of processing and forming, it is characterized in that: outer warp of the screw rod of its fluxing zone and screw sleeve internal diameter are more than or equal to outer warp of the screw rod of transportation section and screw sleeve internal diameter, outer warp of the screw rod of little what homogenizing zone and metering section and screw sleeve internal diameter, the footpath is smaller or equal to warp at the bottom of the screw rod of transportation section, greater than footpath at the bottom of the screw rod of homogenizing zone and metering section at the bottom of the screw rod of its fluxing zone.
2. double screw extruder according to claim 1 is characterized in that: its screw rod is monoblock type or separate assembling.
3. double screw extruder according to claim 1 is characterized in that: its screw sleeve is monoblock type or separate assembling.
4. double screw extruder according to claim 1 is characterized in that: its twin-screw is in the same way or incorgruous rotation.
5. double screw extruder according to claim 3 is characterized in that: its screw sleeve has at least one charging aperture.
6. double screw extruder according to claim 3 is characterized in that: its screw sleeve has at least one exhaust outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100186651A CN1559783A (en) | 2004-02-17 | 2004-02-17 | Multi-step double-screw rod extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100186651A CN1559783A (en) | 2004-02-17 | 2004-02-17 | Multi-step double-screw rod extruder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1559783A true CN1559783A (en) | 2005-01-05 |
Family
ID=34440737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100186651A Pending CN1559783A (en) | 2004-02-17 | 2004-02-17 | Multi-step double-screw rod extruder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1559783A (en) |
-
2004
- 2004-02-17 CN CNA2004100186651A patent/CN1559783A/en active Pending
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |