Extrusion die for thermoplastic plastics, especially for producing film or sheet, has a ceramic operating member for the adjustable die lip

摘要

The die has an adjustable lip (2), a fixed opposing lip (3), a control member (5) for the adjustable lip and an open and/or closed loop control system (6) for varying the die gap and hence the extrudate thickness. A plunger (8) between the control member and the variable lip is made of a ceramic oxide.