公开(公告)号：EP4180465A1

公开(公告)日：2023-05-17

申请号：EP22206572.4

申请日：2022-11-10

申请人： SERMAG S.r.l. ,  Italrec S.r.l.

发明人： PASSERA, Gianluigi ,  BOLLATI, Nicola ,  ROSMINO, Andrea

IPC分类号： C08F6/00 ,  C08F6/28

摘要： The process comprises the steps of feeding a mixture of polymeric material and water, wherein the polymeric material constitutes from 75 to 95 wt.% and the water from 25 to 5 wt.% of the mixture, to a twin-screw extruder (14) having an L/D ratio between 1.25 and 1.50 and kept at a temperature between 180 and 260 °C; extruding from the twin-screw extruder (14) a melt consisting of 97 to 99 wt.% of polymeric material and 3 to 1 wt.% of water; feeding the melt to a single-screw extruder (16) having an L/D ratio between 20 and 32 and kept at a temperature between 180 and 260 °C, so as to obtain an extruded product; feeding the extruded product to a granulator (20) which produces granules of polymeric material containing no more than 0.3 wt.% of water; feeding the granules of polymeric material to the top of a silo (24) provided with a vertical axis feeding device (34), in countercurrent with a flow of air having a temperature between 80 and 90 °C and a flow rate between 4 and 13 m 3 /kg of granules of polymeric material; and obtaining deodorized granules of polymeric material.