Screw extruder mechanism, in particular twin-screw extruder mechanism, for the processing of strongly outgassing materials
View Patent ↗A screw extruder mechanism for the processing of strongly outgassing materials comprises a main extruder for proper material processing, a material feed and discharge device and a degassing device on the main extruder for the discharge of the gas stream from the portion of evaporation. For the gas stream to branch into at least three separate streams, the degassing device comprises a first degassing port and at least two degassing elements which are opposed radially to each other in relation to the main extruder and are disposed between the portion of evaporation and the first degassing port and which are designed preferably as ancillary screw extruders opening radially into the main extruder.
1. A screw extruder mechanism for processing strongly outgassing materials, comprising:
a main extruder ( 1 ) with screws ( 2 , 3 ) for proper material processing, with a conveying direction (F) and with a portion of evaporation,
a material feed device ( 4 ) at the main extruder ( 1 ) for a supply of material to be processed,
a material discharge device ( 5 ) at an end of the main extruder, and
a degassing device on the main extruder ( 1 ) for a discharge of a gas stream from the portion of evaporation ( 14 ), and
wherein for the gas stream to branch into at least three separate streams ( 19 , 20 , 21 ) in a closed portion of the main extruder ( 1 ), the degassing device comprises at least a first degassing port ( 13 , 13 ′) disposed upstream or downstream of the portion of evaporation ( 14 ) and at least two degassing elements ( 7 , 8 ; 7 ′, 8 ′) opposed to each other radially in relation to the main extruder ( 1 ) and extending from opposite sides of the main extruder, said degassing elements being disposed between the portion of evaporation ( 14 ) and the at least one first degassing port ( 13 , 13 ′).
2. A screw extruder mechanism according to claim 1 wherein the at least two degassing elements are ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) which open radially into the main extruder ( 1 ) via mouths.
3. A screw extruder mechanism according to claim 2 , wherein a conveying direction of the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) points in a direction towards the main extruder.
4. A screw extruder mechanism according to claim 2 , comprising damming elements ( 16 ) disposed in the main extruder ( 1 ) before the mouths of the ancillary screw extruders ( 7 , 8 ).
5. A screw extruder mechanism according to claim 2 , comprising damming elements ( 16 ) disposed in the ancillary screw extruders ( 7 , 8 ).
6. A screw extruder mechanism according to claim 2 , wherein the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) comprise degassing ports ( 11 , 12 ), which are directed downwards.
7. A screw extruder mechanism according to claim 2 , wherein the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ,) comprise degassing ports ( 11 12 ), which are directed upwards.
8. A screw extruder mechanism according to claim 2 , wherein the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) comprise degassing ports ( 11 , 12 ), which discharge all-over externally.
9. A screw extruder mechanism according to claim 2 , wherein the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) are twin-screw extruders which are mounted on the main extruder ( 1 ) in such a way that a positional plane (E 1 ) spanned by axes of the screws of the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) is parallel to the conveying direction (F) of the main extruder ( 1 ).
10. A screw extruder mechanism according to claim 2 , wherein the ancillary screw extruders ( 23 , 24 ) are twin-screw extruders which are mounted on the main extruder ( 1 ) in such a way that a positional plane (E 2 , E 3 ) spanned by axes of the screws of the ancillary screw extruders ( 23 , 24 ) is at right angles to the conveying direction (F) of the main extruder ( 1 ).
11. A screw extruder mechanism according to claim 2 , wherein said radially opposed ancillary screw extruders ( 7 , 8 ) have varying conveying directions and pitches.
12. A screw extruder mechanism according to claim 1 , wherein for combined concurrent and countercurrent flow degassing, one of said degassing devices is disposed upstream and one of said degassing devices is disposed downstream of the portion of evaporation ( 14 ).
13. A screw extruder mechanism for processing strongly outgassing materials, comprising:
a main extruder ( 1 ) with screws ( 2 , 3 ) for proper material processing,
with a conveying direction (F) and with a portion of evaporation,
a material feed device ( 4 ) at the main extruder ( 1 ) for a supply of material to be processed,
a material discharge device ( 5 ) at an end of the main extruder, and
a degassing device on the main extruder ( 1 ) for a discharge of a gas stream from the portion of evaporation ( 14 ), and
wherein for the gas stream to branch into at least three separate streams ( 19 , 20 , 21 ) in a closed portion of the main extruder ( 1 ), the degassing device comprises at least a first degassing port ( 13 , 13 ′) disposed upstream or downstream of the portion of evaporation ( 14 ) and at least two degassing elements ( 7 , 8 , 7 ′, 8 ′) opposed to each other radially in relation to the main extruder ( 1 ) and disposed between the portion of evaporation ( 14 ) and the at least one first degassing port ( 13 , 13 ′), and
wherein the at least two degassing elements are ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) which open radially into the main extruder ( 1 ) via mouths, and
wherein the screws ( 10 ) of the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) are provided with plane faces ( 9 ) which are disposed at a minimum distance to the screws ( 2 , 3 ) of the main extruder ( 1 ).
14. A screw extruder mechanism according to claim 13 , wherein for combined concurrent and countercurrent flow degassing, one of said degassing elements is disposed upstream, and one of said degassing elements is disposed downstream of the portion of evaporation ( 14 ).
15. A screw extruder mechanism according to claim 13 , comprising damming elements( 16 ) disposed in the main extruder ( 1 ) before the mouths of the ancillary screw extruders( 7 , 8 ).
16. A screw extruder mechanism according to claim 13 , comprising damming elements( 16 ) disposed in the ancillary screw extruders ( 7 , 8 ).
17. A screw extruder mechanism according to claim 13 , wherein the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) are twin-screw extruders which are mounted on the main extruder ( 1 ) in such a way that a positional plane (E 1 ) spanned by axes of the screws of the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) is parallel to the conveying direction (F) of the main extruder ( 1 ).
18. A screw extruder mechanism according to claim 13 , wherein the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) are twin-screw extruders which are mounted on the main extruder ( 1 ) in such a way that a positional plane (E 2 , E 3 ) spanned by axes of the screws of the ancillary screw extruders ( 23 , 24 ) is at right angles to the conveying direction (F) of the main extruder ( 1 ).
19. A screw extruder mechanism for processing strongly outgassing materials, comprising:
a main extruder ( 1 ) with screws ( 2 , 3 ) for proper material processing, with a conveying direction (F) and with a portion of evaporation,
a material feed device ( 4 ) at the main extruder ( 1 ) for a supply of material to be processed,
a material discharge device ( 5 ) at an end of the main extruder, and
a degassing device on the main extruder ( 1 ) for a discharge of a gas stream from the portion of evaporation ( 14 ), and
wherein for the gas stream to branch into at least three separate streams ( 19 , 20 , 21 ) in a closed portion of the main extruder ( 1 ), the degassing device comprises at least a first degassing port ( 13 , 13 ′) disposed upstream or downstream of the portion of evaporation ( 14 ) and at least two degassing elements ( 7 , 8 , 7 ′, 8 ′) opposed to each other radially in relation to the main extruder ( 1 ) and disposed between the portion of evaporation ( 14 ) and the at least one first degassing port ( 13 , 13 ′), and
wherein the at least two degassing elements are ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) which open radially into the main extruder ( 1 ) via mouths, and
wherein the screws ( 10 ) of the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) expand conically outward.
20. A screw extruder mechanism according to claim 19 , wherein for combined concurrent and countercurrent flow degassing, one of said degassing elements is disposed upstream, and one of said degassing elements is disposed downstream of the portion of evaporation ( 14 ).
21. A screw extruder mechanism according to claim 19 , comprising damming elements( 16 ) disposed in the main extruder ( 1 ) before the mouths of the ancillary screw extruders ( 7 , 8 ).
22. A screw extruder mechanism according to claim 19 , comprising damming elements( 16 ) disposed in the ancillary screw extruders ( 7 , 8 ).
23. A screw extruder mechanism according to claim 19 , wherein the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) are twin-screw extruders which are mounted on the main extruder ( 1 ) in such a way that a positional plane (E 1 ) spanned by axes of the screws of the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) is parallel to the conveying direction (F) of the main extruder ( 1 ).
24. A screw extruder mechanism according to claim 19 , wherein the ancillary screw extruders ( 7 , 8 ; 23 , 24 , 25 , 26 ) are twin-screw extruders which are mounted on the main extruder ( 1 ) in such a way that a positional plane (E 2 , E 3 ) spanned by axes of the screws of the ancillary screw extruders ( 23 , 24 ) is at right angles to the conveying direction (F) of the main extruder ( 1 ).