DEGASSING EXTRUDER WITH MULTI-SCREW UNIT AND METHOD FOR DEGASSING OF POLYMER MELT, USING IT Russian patent published in 2023 - IPC B29C48/435 B29C48/67 B29C48/76 

FIELD: chemistry.

SUBSTANCE: invention relates to a degassing extruder with a multi-screw unit, as well as to a method for degassing of a polymer melt, using it. The degassing extruder with the multi-screw unit contains a case with an input area containing an inlet, an inner recess of the case with a suction hole extending outwards, and an output area with an outlet. Multi-screw unit (10) located in the case recess, capable of rotating contains rotary element (11) with protrusion (12) of the main screw, passing along an outer perimeter of trunk (15) of a rotor shaft, and rotated auxiliary screw (16) installed in receiving groove (13) on rotary element (11), wherein receiving groove (13) passes along at least part of a length of multi-screw unit (10). Protrusion (12) of the main screw has an open recess above receiving groove (13) for passage of auxiliary screw (16) at least in the area of the suction hole. A perimeter of auxiliary screw (16) in passages (14) formed with protrusion (12) of the main screw is for at least 40% and at most 70% covered in receiving groove (13) in trunk (15) of the rotor shaft, and a degree of cross-section coverage of auxiliary screw (16) inside protrusion (12) of the main screw is greater than in passages (14) outside of it, and it is at most 95%.

EFFECT: increase in the quality of a processed polymer melt.

10 cl, 7 dwg