Polymer and polymer mixture membrane production comprises melting polymers in forming unit, supplying gas, and controlling temperature of nozzle at end of process line

摘要

The production of polymer and polymer mixture membranes comprises melting the polymers in a forming unit in an extruder (11), and supplying gas (14) to form a foam at a nozzle (12) at the end of the process line (15). The nozzle temperature is controlled according to the polymer used, and is about 310[deg]C for polyethersulfone and 183[deg]C for polycarbonate. The production of polymer and polymer mixture membranes comprises melting the polymers in a forming unit in an extruder (11), and supplying gas (14) to form a foam at a nozzle (12) at the end of the process line (15). The nozzle temperature is controlled according to the polymer used, and is about 310[deg]C for polyethersulfone and 183[deg]C for polycarbonate. The process line has a number of temperature zones. The gas used is CO2 and it is supplied in an amount of 1-15 wt.% of the polymer.