Patent ID: 6325307
Filing Date: 2001-12-04
Classification: B29B

Abstract:
Apparatus for producing powder from polymeric material comprising:a grinding casing provided with an inlet opening and a discharging outlet;a grinding chamber in said casing;a grinding rotor mounted coaxially within said casing, said grinding rotor being shaped as a body of revolution and being spaced by a clearance from the inner surface of the casing;a compacting casing with a compacting chamber located therein, said compacting chamber being aligned with and located prior to said grinding chamber, said compacting chamber having a charging inlet and an outlet opening;a compacting screw in said compacting chamber, said compacting screw having helical channels which have a depth which is gradually reduced toward the outlet opening; and,a ring shaped recess of a predetermined depth at at least one of the following locations:in the compacting screw, near the outlet opening of the compacting chamber;in the grinding rotor, near the inlet opening of the grinding casing.