| 摘要 |
The new double screw extrusion unit, processes materials strongly evolving gases (here including evolved vapours), includes a main extruder (1), materials feed unit (4) and an extraction unit (5). As appropriate, there is a feed for e.g. an agent promoting gas evolution, a solvent, emulsion, moist bulk material or pastes, into a de-gasification region (14) in the main extruder (1). A de-gasification system at the main extruder, removes gases and vapours from this region (14). Improved features of the de-gasification unit include the branchings (19, 20, 21) for gases into three partial streams at the closed region of the main extruder. There is a gas vent (13) up- or downstream of the de-gasification zone with at least two intermediate, radially-opposite vents (11, 12) on either side, with auxiliary degasification screws (7, 8). |
