CN215396796U - Screw structure of double-screw extruder for mixing and modifying powder coating - Google Patents
Screw structure of double-screw extruder for mixing and modifying powder coating Download PDFInfo
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- CN215396796U CN215396796U CN202121682077.3U CN202121682077U CN215396796U CN 215396796 U CN215396796 U CN 215396796U CN 202121682077 U CN202121682077 U CN 202121682077U CN 215396796 U CN215396796 U CN 215396796U
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Abstract
The utility model provides a screw structure of a double-screw extruder for blending and modifying powder coating, and particularly relates to the field of screw extrusion devices, wherein the screw structure comprises a conveying compression section, a mixing section and an extrusion section which are sequentially arranged from a feed port; wherein the mixing section consists of 8 engaging blocks of K90 degrees, and the total length-diameter ratio of the screw is 20 to 1. The utility model solves the problems of the prior art that the double-screw structure has long length-diameter ratio and long retention time, which causes the increase of black spots and yellowing of the powder coating.
Description
Technical Field
The utility model belongs to the field of screw extrusion devices, and particularly relates to a screw structure of a double-screw extruder for blending and modifying powder coating.
Background
In the prior art, the double-screw structure mainly aims at modification processing of polyethylene, polypropylene, engineering plastics and the like, has long length-diameter ratio and long retention time, the mixing section often adopts meshing block combinations with staggered angles of 30 degrees, 45 degrees, 60 degrees and 90 degrees, and even a reverse thread element is adopted to increase the local fullness of the mixing section and the melt pressure of materials. The screw structure is used for the mixing modification processing operation of the powder coating, and has long length-diameter ratio and long retention time, so that the black spots and yellowing of the powder coating are increased, and the performances of various aspects of modified materials are influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a screw structure of a double-screw extruder for mixing and modifying powder coating, and solves the problems of increase of black spots and yellowing of the powder coating due to long length-diameter ratio and long retention time of the double-screw structure in the prior art.
The utility model provides the following technical scheme:
a screw structure of a double-screw extruder for mixing and modifying powder coating comprises a conveying compression section, a mixing section and an extrusion section which are arranged in sequence from a feeding port; wherein the mixing section consists of 8 engaging blocks of K90 degrees, and the total length-diameter ratio of the screw is 20 to 1.
Preferably, the ratio of the length of the conveying compression section to the total length of the screw is 8 to 20.
Preferably, the delivery compression section consists of 4 right-hand delivery elements with a lead of 1.5D and 2 right-hand delivery elements with a lead of 1.0D.
Preferably, 4 right-handed conveying elements with the lead of 1.5D are arranged closely in sequence, and 2 right-handed conveying elements with the lead of 1.0D are arranged on two sides of the right-handed conveying element with the lead of 1.5D.
Preferably, the ratio of the length of the mixing section to the total length of the screw is 8 to 20, and the meshing block adopts meshing block elements of K90 DEG/5/1.0D.
Preferably, the ratio of the length of the extruded section to the total length of the screw is 4 to 20.
Preferably, the extrusion section consists of 2 right-hand conveying elements with a lead of 1.0D and 3 right-hand conveying elements with a lead of 0.75D, which are closely arranged in sequence.
The utility model has the beneficial effects that:
according to the utility model, the types of the existing screw elements are utilized, the mixing section adopts a combination of the meshing blocks with the K90 degrees and the meshing block with the K90 degrees, which have strong shearing, so that the materials of all components are fully and uniformly dispersed in a short time, the length-diameter ratio is shortened and the retention time is reduced under the condition of ensuring full mixing, the black point and yellowing of the powder coating are reduced, and meanwhile, the performance indexes of all aspects meet the performance requirements of the use link.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic view of the overall structure of the present invention;
labeled as: 1. a right-handed conveying element with a lead of 1.5D; 2. the lead of the right-handed conveying element group is 1.0D; 3. an engagement block; 4. right-handed conveying elements with a lead of 0.75D.
Detailed Description
As shown in figure 1, a screw structure of a double-screw extruder for compounding and modifying powder coating comprises a conveying compression section, a mixing section and an extrusion section which are arranged in sequence from a feeding port; wherein the mixing section consists of 8K 90 DEG meshing blocks 3, and the total length-diameter ratio of the screw is 20 to 1. The length-diameter ratio of the screw is 20:1, the screw is in a screw configuration, 1 mixing section configuration is arranged from a feeding port to an outlet of the extruder, and the screw is matched with 1 conveying compression section and 1 extrusion section; the design of the mixing section 1 is the key point of the device, 8 engaging blocks with the angle of K90 degrees are combined, and the shearing is concentrated, so that the powder coating can be fully and uniformly dispersed in a short time when passing through the mixing section, and under the condition of ensuring full mixing, the length-diameter ratio is shortened, and the retention time is reduced; the ratio of the length of the conveying compression section to the total length of the screw is 8 to 20, and the proportional length can be adapted to production, so that the quality of products is ensured. The conveying compression section consists of 4 right-handed conveying elements 1 with the lead of 1.5D and 2 right-handed conveying elements 2 with the lead of 1.0D, and provides compression in the material conveying and conveying processes; 4 dextrorotation conveying element 1 that the lead is 1.5D closely arrange in proper order, dextrorotation conveying element 1 both sides that the lead is 1.5D are equipped with 2 dextrorotation conveying element 2 that the lead is 1.0D, and K90 degree meshing block uses in combination, improves the mixed section and cuts. The length of the mixing section and the total length of the screw are 8 to 20, the proportional length can be adapted to production, the quality of products is ensured, and the meshing block 3 adopts meshing block elements with K90 degrees/5/1.0D, and provides shearing force required by material mixing. The ratio of the length of the extrusion section to the total length of the screw is 4 to 20, and the proportional length can be adapted to production, so that the quality of products is ensured. The extrusion section consists of 2 right-hand conveying elements 2 with a lead of 1.0D and 3 right-hand conveying elements 4 with a lead of 0.75D, which are closely arranged in sequence. The length proportion of the device is adjusted according to the actual length in production, and the proportion is ensured to accord with the record of the application.
Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the utility model as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A screw structure for a twin-screw extruder for powder coating compounding modification, characterized in that: comprises a conveying compression section, a mixing section and an extrusion section which are arranged in sequence from a feeding port; wherein the mixing section consists of 8 engaging blocks of K90 degrees, and the total length-diameter ratio of the screw is 20 to 1.
2. A screw structure for a twin screw extruder for powder coating compounding modification according to claim 1, characterized in that: the ratio of the length of the conveying compression section to the total length of the screw is 8 to 20.
3. A screw structure for a twin screw extruder for powder coating compounding modification according to claim 2, characterized in that: the conveying compression section consists of 4 right-hand conveying elements with a lead of 1.5D and 2 right-hand conveying elements with a lead of 1.0D.
4. A screw structure for a twin screw extruder for powder coating compounding modification according to claim 3, characterized in that: 4 dextrorotation conveying elements with 1.5D lead are closely arranged in sequence, and 2 dextrorotation conveying elements with 1.0D lead are arranged on two sides of the dextrorotation conveying elements with 1.5D lead.
5. A screw structure for a twin-screw extruder modified for powder coating compounding as claimed in claim 4, characterized in that: the ratio of the length of the mixing section to the total length of the screw is 8 to 20, and the meshing block adopts meshing block elements of K90 degrees/5/1.0D.
6. A screw structure for a twin screw extruder modified for powder coating compounding as claimed in claim 5, characterized in that: the ratio of the length of the extruded section to the total length of the screw was 4 to 20.
7. A screw structure for a twin screw extruder modified for powder coating compounding as claimed in claim 6, characterized in that: the extrusion section consists of 2 right-handed conveying elements with a lead of 1.0D and 3 right-handed conveying elements with a lead of 0.75D, which are closely arranged in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121682077.3U CN215396796U (en) | 2021-07-20 | 2021-07-20 | Screw structure of double-screw extruder for mixing and modifying powder coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121682077.3U CN215396796U (en) | 2021-07-20 | 2021-07-20 | Screw structure of double-screw extruder for mixing and modifying powder coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215396796U true CN215396796U (en) | 2022-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121682077.3U Active CN215396796U (en) | 2021-07-20 | 2021-07-20 | Screw structure of double-screw extruder for mixing and modifying powder coating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215396796U (en) |
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2021
- 2021-07-20 CN CN202121682077.3U patent/CN215396796U/en active Active
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