CN213382904U - PLA modified double-screw rod configuration for biodegradable material - Google Patents
PLA modified double-screw rod configuration for biodegradable material Download PDFInfo
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- CN213382904U CN213382904U CN202022210475.7U CN202022210475U CN213382904U CN 213382904 U CN213382904 U CN 213382904U CN 202022210475 U CN202022210475 U CN 202022210475U CN 213382904 U CN213382904 U CN 213382904U
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Abstract
The utility model belongs to the technical field of the double screw extruder, concretely relates to be used for biodegradable materials PLA modified double screw rod configuration. The utility model comprises a material cylinder which is formed by splicing a plurality of material cylinder bodies, wherein two screw rods are arranged in the material cylinder, and each screw rod comprises a first conveying and compressing section, a first mixing section, a second conveying and compressing section, a second mixing section, a third conveying and compressing section, a third mixing section, a conveying section, a fourth mixing section and an extrusion section which are sequentially arranged along the material conveying direction; the charging barrel is provided with a feeding hole, a natural exhaust port, a first vacuum exhaust port and a second vacuum exhaust port. The utility model selects the right-handed meshing block and the left-handed meshing block to be used in a mixing section, the shearing strength of the right-handed meshing block is moderate, and the biodegradable material is not yellowed or decomposed; the left-handed meshing block replaces a left-handed thread element to increase the fullness of the mixing section, and the left-handed meshing block can provide the local fullness required by the mixing section, so that uniform mixing is ensured, and the melt pressure cannot be increased too high.
Description
Technical Field
The utility model belongs to the technical field of the double screw extruder, concretely relates to be used for biodegradable materials PLA modified double screw rod configuration.
Background
Twin-screw extruders are widely used in industrial production due to their many characteristics. The twin-screw extruder consists of a transmission device, a feeding device, a charging barrel, a screw and the like, and has a plurality of different forms, wherein the main difference is the structure difference of the screw components, and the structure difference of the screw components is mainly due to the difference of screw elements in the screw components. Different screw elements have their own advantages and disadvantages, which are reflected in particular in the extrusion, mixing and power consumption characteristics of the screw elements.
In the prior art, the double-screw configuration is mainly aimed at modification processing of polyethylene, polypropylene, engineering plastics and the like, local shearing is too strong, meshing block combinations with staggered angles of 45 degrees, 60 degrees and 90 degrees are frequently used in a mixing section, and even a reverse left-handed thread element is adopted to increase the local fullness of the mixing section and the melt pressure of materials. For the modification processing operation of the biodegradable material PLA, the shearing of the mixing section is too strong, the melt pressure is too high, the biodegradable material is yellowed, even decomposed, and various performances of the modified material are influenced.
SUMMERY OF THE UTILITY MODEL
In view of the above insufficiency, the utility model aims at providing a be used for biodegradable materials PLA modified twin-screw configuration.
The utility model provides a following technical scheme:
a double-screw rod configuration for modifying a biodegradable material PLA comprises a material barrel formed by splicing a plurality of material barrel bodies, wherein two screws are arranged in the material barrel side by side, each screw comprises a first conveying and compressing section, a first mixing section, a second conveying and compressing section, a second mixing section, a third conveying and compressing section, a third mixing section, a third conveying section, a fourth mixing section and an extruding section, which are sequentially arranged along the material conveying direction, wherein a feeding hole is formed in the material barrel positioned at one end of the first conveying and compressing section, which is far away from the first mixing section, a natural exhaust hole is formed in the material barrel positioned at the second conveying and compressing section, a first vacuum exhaust hole is formed in the material barrel positioned at the third conveying and compressing section, and a second vacuum exhaust hole is formed;
the conveying compression section I is sequentially provided with a right-handed conveying element II, a plurality of right-handed conveying elements I, a right-handed conveying element II and a plurality of right-handed conveying elements III along the material conveying direction;
a plurality of right-handed meshing block elements and a left-handed meshing block element are sequentially arranged on the first mixing section along the material conveying direction;
the conveying compression section II is sequentially provided with a plurality of right-handed conveying elements I, a plurality of right-handed conveying elements II and a plurality of right-handed conveying elements III along the material conveying direction;
the mixing section II is sequentially provided with a plurality of right-handed meshing block elements and a left-handed meshing block element along the material conveying direction;
the conveying compression section III is sequentially provided with a plurality of right-handed conveying elements I, a plurality of right-handed conveying elements II and a plurality of right-handed conveying elements III along the material conveying direction;
a plurality of right-handed meshing block elements are sequentially arranged in the mixing section III along the material conveying direction;
the conveying section is sequentially provided with a plurality of right-handed conveying elements II along the material conveying direction;
a plurality of right-handed meshing block elements and a left-handed meshing block element are sequentially arranged in the mixing section IV along the material conveying direction;
and the extrusion section is sequentially provided with a plurality of right-handed conveying elements I, a plurality of right-handed conveying elements II and a plurality of right-handed conveying elements III along the material conveying direction.
The lead of the right-handed conveying element I is 74.4 mm-76.8 mm; the lead of the right-handed conveying element II is 62-64 mm; and the lead of the right-handed conveying element III is 43.4 mm-44.8 mm.
The angle of the meshing disc of the right-handed meshing block element is 45 degrees.
The number of the engaging discs of the right-hand engaging block element is 5.
The lead of the right-handed meshing block element is 55.8 mm-57.6 mm.
The angle of the engaging disk of the left-handed engaging block element is 45 degrees.
The number of the engaging discs of the left-handed engaging block member is 5.
The lead of the left-handed meshing block element is 31 mm-32 mm.
The utility model has the advantages that:
the utility model selects the right-handed meshing block and the left-handed meshing block to be used in a matching way in the mixing section, the shearing strength of the right-handed meshing block is moderate, and the biodegradation material is prevented from yellowing and decomposing while the uniform mixing of the materials of all components is ensured; the left-handed meshing block replaces a left-handed thread element to increase the fullness of the mixing section, and the left-handed meshing block can provide the local fullness required by the mixing section, so that uniform mixing is ensured, and the melt pressure cannot be increased too high.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic structural diagram of various elements of the present invention;
FIG. 3 is a schematic structural diagram of a conveying and compressing section of the present invention;
FIG. 4 is a schematic structural diagram of a mixing section of the present invention;
FIG. 5 is a schematic structural view of a second conveying and compressing section of the present invention;
FIG. 6 is a schematic structural view of a second mixing section of the present invention;
FIG. 7 is a schematic diagram of the three-structure of the conveying and compressing section of the present invention;
FIG. 8 is a schematic diagram of a mixing section three-structure of the present invention;
fig. 9 is a schematic structural view of a conveying section of the present invention;
fig. 10 is a schematic structural view of a mixing section four of the present invention;
fig. 11 is a schematic view of the structure of the extrusion section of the present invention.
Labeled as: the device comprises a first conveying and compressing section 101, a first mixing section 102, a second conveying and compressing section 103, a second mixing section 104, a third conveying and compressing section 105, a third mixing section 106, a conveying section 107, a fourth mixing section 108, an extrusion section 109, a barrel 110, a first vacuum exhaust port 111, a second vacuum exhaust port 112, a feed inlet 113, a natural exhaust port 114, a first right-handed conveying element 201, a second right-handed conveying element 202, a third right-handed conveying element 203, a right-handed meshing block element 204 and a left-handed meshing block element 205.
Detailed Description
As shown in the figure, the PLA modified twin-screw configuration for the biodegradable material comprises a first conveying and compressing section 101, a first mixing section 102, a second conveying and compressing section 103, a second mixing section 104, a third conveying and compressing section 105, a third mixing section 106, a conveying section 107, a fourth mixing section 108, an extruding section 109, a barrel 110, a first vacuum exhaust port 111, a second vacuum exhaust port 112, a feed inlet 113 and a natural exhaust port 114. The cartridge 110 is made by joining several cartridge bodies by welding or bolting. Two screws are arranged in the charging barrel 110 side by side and connected with a power mechanism. The screw comprises a first conveying and compressing section 101, a first mixing section 102, a second conveying and compressing section 103, a second mixing section 104, a third conveying and compressing section 105, a third mixing section 106, a conveying section 107, a fourth mixing section 108 and an extrusion section 109 which are sequentially arranged along the material conveying direction. The feed inlet 113 is arranged on the charging barrel 110 which is positioned at one end, far away from the mixing section 102, of the first conveying and compressing section 101, materials can be injected into the charging barrel 110 through the feed inlet 113, and the materials are mixed, compressed, sheared and conveyed through the double screws.
The material cylinder 110 is also provided with an exhaust port, wherein a natural exhaust port 114 is arranged on the material cylinder 110 at the second conveying and compressing section 103, a first vacuum exhaust port 111 is arranged on the material cylinder 110 at the third conveying and compressing section 105, and a second vacuum exhaust port 112 is arranged on the material cylinder 110 at the extrusion section 109.
The conveying compression section I101 is sequentially provided with a right-handed conveying element II 202, a plurality of right-handed conveying elements I201, a right-handed conveying element II 202 and a plurality of right-handed conveying elements III 203 along the material conveying direction. The lead of the right-handed conveying element I201 is 74.4 mm-76.8 mm; the lead of the right-handed conveying element II 202 is 62 mm-64 mm; the lead of the right-handed conveying element III 203 is 43.4 mm-44.8 mm. The staggered arrangement of the conveying elements with different leads can fully compress and smoothly convey the material newly injected into the barrel of the extruder.
The first mixing section 102 is provided with a plurality of right-handed engaging block elements 204 and a left-handed engaging block element 205 in sequence along the material conveying direction. The right hand engagement block element 204 has an engagement disc angle of 45 degrees. The right-hand engagement block member 204 has 5 engagement plates. The lead of the right-handed meshing block element 204 is 55.8 mm-57.6 mm. The engagement disc angle of the left-handed engagement block member 205 is 45 degrees. The engaging disk number of the left-hand engaging block member 205 is 5. The lead of the left-handed engagement block element 205 is 31mm to 32 mm. The right-handed meshing block elements 204 are used in combination, and the shearing force is moderate, so that when the biodegradable material PLA passes through the first mixing section 102, the mixing effect is achieved, and meanwhile, the material is not broken down due to over-shearing caused by the mechanical shearing force applied to the material. By providing a left-handed engagement block element 205 at the end of the first mixing section 102, the residence time of the material in the first mixing section can be increased to provide the desired degree of fullness during mixing, while the left-handed engagement block element 205 has a certain leakage flow so that the melt pressure of the material in the first mixing section 102 is not too high. The right-handed meshing block element 204 and the left-handed meshing block element 205 are used in combination, so that the problems of yellowing and decomposition in the modification process of the biodegradable material PLA can be solved.
The conveying compression section II 103 is sequentially provided with a plurality of right-handed conveying elements I201, a plurality of right-handed conveying elements II 202 and a plurality of right-handed conveying elements III 203 along the material conveying direction. The lead length of each conveying element is reduced along the material conveying direction, and the lead of the right-handed conveying element I201 close to the mixing section I102 is larger than that of the right-handed conveying element II 202 and that of the right-handed conveying element III 203, so that the material extruded from the mixing section I102 enters the conveying compression section II 103 smoothly. The conveying elements with different leads are arranged in a staggered mode, so that the materials can be fully compressed and conveyed smoothly. And a natural exhaust port 114 is formed in the material barrel 110 at the position corresponding to the second conveying and compressing section 103 and used for exhausting air.
The second mixing section 104 is sequentially provided with a plurality of right-handed meshing block elements 204 and a left-handed meshing block element 205 along the material conveying direction. The material compressed by the second conveying and compressing section 103 enters the second mixing section 104, the right-handed meshing block element 204 with moderate shearing force shears the material, and the left-handed meshing block element 205 arranged at the tail end of the second mixing section 104 can provide the fullness required by the mixing process and reduce the melt pressure in the second mixing section 104.
The conveying compression section III 105 is sequentially provided with a plurality of right-handed conveying elements I201, a plurality of right-handed conveying elements II 202 and a plurality of right-handed conveying elements III 203 along the material conveying direction. The lead length of each conveying element is reduced along the material conveying direction, and the lead of the right-handed conveying element I201 close to the mixing section I102 is larger than that of the right-handed conveying element II 202 and that of the right-handed conveying element III 203, so that the material extruded from the mixing section II 104 can smoothly enter the conveying compression section III 105 for compression and conveying. And a first vacuum exhaust port 111 is formed in the material barrel 110 at the position corresponding to the third conveying and compressing section 105 and used for exhausting.
A plurality of right-handed meshing block elements 204 are sequentially arranged in the third mixing section 106 along the material conveying direction; a plurality of second right-handed conveying elements 202 are sequentially arranged on the conveying section 107 which is adjacent to the third mixing section 106 along the material conveying direction, and the number of the second right-handed conveying elements 202 is 3; the mixing section four 108 adjacent to the conveying section 107 is sequentially provided with a plurality of right-handed meshing block elements 204 and a left-handed meshing block element 205 along the material conveying direction. The materials are compressed by the conveying compression section III 105 and then enter the mixing section III 106 for further shearing and mixing. And the right-handed conveying element II 202 with moderate lead is selected for the conveying section 107 next to the mixing section III 106 for conveying. In order to increase the fullness of mixing section three 106, the conveying section 107 should not be too long. The materials enter the mixing section four 108, the right-handed meshing block element 204 with moderate shearing force shears the materials, and the left-handed meshing block element 205 arranged at the tail end of the mixing section four 108 can provide the fullness required by the mixing process and reduce the melt pressure in the mixing section four 108
The extrusion section 109 is sequentially provided with a plurality of first right-handed conveying elements 201, a plurality of second right-handed conveying elements 202 and a plurality of third right-handed conveying elements 203 along the material conveying direction. The material is finally extruded through extrusion section 109 to complete the process. A second vacuum exhaust port 112 is formed on the material cylinder 110 at the position corresponding to the extrusion section 109 for exhausting air.
The first embodiment is as follows:
when the diameter of the screw is phi 62mm, the lead of the right-handed conveying element I201 is 74.4 mm; the lead of the right-handed conveying element II 202 is 62 mm; the lead of the right-handed conveying element III 203 is 43.4 mm; the lead of the right-handed meshing block element 204 is 55.8 mm; the lead of the left-handed engagement block element 205 is 31 mm. The conveying compression section I101 is sequentially provided with a right-handed conveying element II 202, 3 right-handed conveying elements I201, a right-handed conveying element II 202 and 4 right-handed conveying elements III 203 along the material conveying direction; the first mixing section 102 is sequentially provided with 3 right-handed meshing block elements 204 and a left-handed meshing block element 205 along the material conveying direction; the conveying compression section II 103 is sequentially provided with a first 3-dextrorotation conveying element 201, a second 3-dextrorotation conveying element 202 and a third 3-dextrorotation conveying element 203 along the material conveying direction; the second mixing section 104 is sequentially provided with 3 right-handed meshing block elements 204 and a left-handed meshing block element 205 along the material conveying direction; the conveying compression section III 105 is sequentially provided with 2 right-handed conveying elements I201, 2 right-handed conveying elements II 202 and 4 right-handed conveying elements III 203 along the material conveying direction; the third mixing section 106 is sequentially provided with 3 right-handed meshing block elements 204 along the material conveying direction;
the conveying section 107 is sequentially provided with 3 second right-handed conveying elements 202 along the material conveying direction; the fourth mixing section 108 is sequentially provided with 3 right-handed meshing block elements 204 and a left-handed meshing block element 205 along the material conveying direction; the extrusion section 109 is sequentially provided with a first 3 right-handed conveying elements 201, a second 2 right-handed conveying elements 202 and a third 3 right-handed conveying elements 203 along the material conveying direction.
Example two:
when the diameter of the screw is phi 63mm, the lead of the right-handed conveying element I201 is 75.6 mm; the lead of the right-handed conveying element II 202 is 63 mm; the lead of the right-handed conveying element III 203 is 44.1 mm; the lead of the right-hand engagement block element 204 is 56.7 mm; the lead of the left-handed engagement block element 205 is 31.5 mm. The conveying compression section I101 is sequentially provided with a right-handed conveying element II 202, 3 right-handed conveying elements I201, a right-handed conveying element II 202 and 4 right-handed conveying elements III 203 along the material conveying direction; the first mixing section 102 is sequentially provided with 3 right-handed meshing block elements 204 and a left-handed meshing block element 205 along the material conveying direction; the conveying compression section II 103 is sequentially provided with a first 3-dextrorotation conveying element 201, a second 3-dextrorotation conveying element 202 and a third 3-dextrorotation conveying element 203 along the material conveying direction; the second mixing section 104 is sequentially provided with 3 right-handed meshing block elements 204 and a left-handed meshing block element 205 along the material conveying direction; the conveying compression section III 105 is sequentially provided with 2 right-handed conveying elements I201, 2 right-handed conveying elements II 202 and 4 right-handed conveying elements III 203 along the material conveying direction; the third mixing section 106 is sequentially provided with 3 right-handed meshing block elements 204 along the material conveying direction;
the conveying section 107 is sequentially provided with 3 second right-handed conveying elements 202 along the material conveying direction; the fourth mixing section 108 is sequentially provided with 3 right-handed meshing block elements 204 and a left-handed meshing block element 205 along the material conveying direction; the extrusion section 109 is sequentially provided with a first 3 right-handed conveying elements 201, a second 2 right-handed conveying elements 202 and a third 3 right-handed conveying elements 203 along the material conveying direction.
Example three:
when the diameter of the screw is phi 64mm, the lead of the right-handed conveying element I201 is 76.8 mm; the lead of the right-handed conveying element II 202 is 64 mm; the lead of the right-handed conveying element III 203 is 44.8 mm; the lead of the right-handed meshing block element 204 is 57.6 mm; the lead of the left-handed engagement block element 205 is 32 mm. The conveying compression section I101 is sequentially provided with a right-handed conveying element II 202, 3 right-handed conveying elements I201, a right-handed conveying element II 202 and 4 right-handed conveying elements III 203 along the material conveying direction; the first mixing section 102 is sequentially provided with 3 right-handed meshing block elements 204 and a left-handed meshing block element 205 along the material conveying direction; the conveying compression section II 103 is sequentially provided with a first 3-dextrorotation conveying element 201, a second 3-dextrorotation conveying element 202 and a third 3-dextrorotation conveying element 203 along the material conveying direction; the second mixing section 104 is sequentially provided with 3 right-handed meshing block elements 204 and a left-handed meshing block element 205 along the material conveying direction; the conveying compression section III 105 is sequentially provided with 2 right-handed conveying elements I201, 2 right-handed conveying elements II 202 and 4 right-handed conveying elements III 203 along the material conveying direction; the third mixing section 106 is sequentially provided with 3 right-handed meshing block elements 204 along the material conveying direction;
the conveying section 107 is sequentially provided with 3 second right-handed conveying elements 202 along the material conveying direction; the fourth mixing section 108 is sequentially provided with 3 right-handed meshing block elements 204 and a left-handed meshing block element 205 along the material conveying direction; the extrusion section 109 is sequentially provided with a first 3 right-handed conveying elements 201, a second 2 right-handed conveying elements 202 and a third 3 right-handed conveying elements 203 along the material conveying direction.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. 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 (8)
1. A modified twin-screw configuration of PLA for biodegradable material, includes a barrel (110) made by splicing a plurality of barrel bodies, and is characterized in that: two screws are arranged in the material barrel (110) side by side, each screw comprises a first conveying and compressing section (101), a first mixing section (102), a second conveying and compressing section (103), a second mixing section (104), a third conveying and compressing section (105), a third mixing section (106), a conveying section (107), a fourth mixing section (108) and an extruding section (109), which are sequentially arranged along the material conveying direction, wherein a material inlet (113) is formed in the material barrel (110) at one end, far away from the first mixing section (102), of the first conveying and compressing section (101), a natural exhaust port (114) is formed in the material barrel (110) at the second conveying and compressing section (103), a first vacuum exhaust port (111) is formed in the material barrel (110) at the third conveying and compressing section (105), and a second vacuum exhaust port (112) is formed in the material barrel (110) at the extruding section (109);
the conveying compression section I (101) is sequentially provided with a right-handed conveying element II (202), a plurality of right-handed conveying elements I (201), a right-handed conveying element II (202) and a plurality of right-handed conveying elements III (203) along the material conveying direction;
a plurality of right-handed meshing block elements (204) and a left-handed meshing block element (205) are sequentially arranged on the mixing section I (102) along the material conveying direction;
the conveying compression section II (103) is sequentially provided with a plurality of right-handed conveying elements I (201), a plurality of right-handed conveying elements II (202) and a plurality of right-handed conveying elements III (203) along the material conveying direction;
a plurality of right-handed meshing block elements (204) and a left-handed meshing block element (205) are sequentially arranged on the second mixing section (104) along the material conveying direction;
the conveying compression section III (105) is sequentially provided with a plurality of right-handed conveying elements I (201), a plurality of right-handed conveying elements II (202) and a plurality of right-handed conveying elements III (203) along the material conveying direction;
a plurality of right-handed meshing block elements (204) are sequentially arranged in the third mixing section (106) along the material conveying direction;
the conveying section (107) is sequentially provided with a plurality of right-handed conveying elements II (202) along the material conveying direction;
a plurality of right-handed meshing block elements (204) and a left-handed meshing block element (205) are sequentially arranged on the mixing section IV (108) along the material conveying direction;
the extrusion section (109) is sequentially provided with a plurality of right-handed conveying elements I (201), a plurality of right-handed conveying elements II (202) and a plurality of right-handed conveying elements III (203) along the material conveying direction.
2. A PLA-modified twin-screw configuration for biodegradable materials according to claim 1, characterized in that: the lead of the right-handed conveying element I (201) is 74.4-76.8 mm; the lead of the right-handed conveying element II (202) is 62-64 mm; the lead of the right-handed conveying element III (203) is 43.4 mm-44.8 mm.
3. A PLA-modified twin-screw configuration for biodegradable materials according to claim 1, characterized in that: the right-hand engagement block element (204) has an engagement disc angle of 45 degrees.
4. A PLA-modified twin-screw configuration for biodegradable material according to claim 3, characterized in that: the right-handed engaging block element (204) has 5 engaging discs.
5. A PLA-modified twin-screw configuration for biodegradable material according to claim 4, characterized in that: the lead of the right-handed meshing block element (204) is 55.8 mm-57.6 mm.
6. A PLA-modified twin-screw configuration for biodegradable materials according to claim 1, characterized in that: the left-handed engagement block element (205) has an engagement disc angle of 45 degrees.
7. A PLA-modified twin-screw configuration for biodegradable material according to claim 6, characterized in that: the left-handed engaging block member (205) has 5 engaging discs.
8. A PLA-modified twin-screw configuration for biodegradable material according to claim 6, characterized in that: the lead of the left-handed meshing block element (205) is 31-32 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022210475.7U CN213382904U (en) | 2020-09-30 | 2020-09-30 | PLA modified double-screw rod configuration for biodegradable material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022210475.7U CN213382904U (en) | 2020-09-30 | 2020-09-30 | PLA modified double-screw rod configuration for biodegradable material |
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| CN213382904U true CN213382904U (en) | 2021-06-08 |
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| CN202022210475.7U Active CN213382904U (en) | 2020-09-30 | 2020-09-30 | PLA modified double-screw rod configuration for biodegradable material |
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