VERFAHREN UND VORRICHTUNG ZUM KONTINUIERLICHEN AUFSCHÄUMEN VON POLYIMIDPULVER

摘要

A method of continuously foaming a polyimide prepolymer powder comprises: (a) preheating a continuous metallic conveyor belt (12) to at least 175 deg.C, (b) continuously depositing the prepolymer powder in a continuous layer onto the conveyor belt, (c) moving the conveyor belt and powder layer through a heated oven (18), (d) causing the prepolymer powder to react and foam by heating the upper portion of the layer by convection and infrared radiation, and the lower portion by heat conduction from the conveyor belt.