Single-screw extruder and use of the single-screw extruder and method of using the single-screw extruder to change the morphology of superabsorbent polymers, ie, SAP polymer gels

摘要

The present invention relates to a single screw extruder (10) for changing the morphology of a superabsorbent polymer gel (SAP polymer gel) (24). The single screw extruder (10) has an inlet opening (36), a guide passage (16), a worm shaft (12) and an outlet opening (30). According to the invention, the worm shaft (12) has a first lead value (G1) of a lead (G) of the worm (14) along a feed zone (18) of the guide passage (16). A second lead value (G2) of the lead (G) of the worm (14) following the feed direction (20) along the feed zone (18) of the guide passage (16). The second read value (G2) is smaller than the first read value (G1).