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AssigneesNPO Norplast, Hermann Berstorff Maschinenbau GmbH
InventorsNikolai S. Enikolopow, Stanislaw A. Wolfson, Anatolie I. Nepomnjaschtschie, Wadim G. Nikolskie, Wiktor A. Teleschow, Lidia A. Filmakowa, Heinz Brinkmann, Eckart Pantzer, Eberhard Uhland
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A method and apparatus for pulverizing polymers. The apparatus comprises a hollow barrel within which at least one screw rotates. The interior of the hollow barrel is divided into a plurality of zones. Heating members are associated with a first of these zones and cooling members are associated with at least a second of these zones. Pre-crushing and pulverizing members are also disposed in said second zone. In the method, polymeric material is fed into the first zone of the hollow barrel and is fused therein. The fused material is then conveyed into the second zone wherein it is cooled, pre-crushed and pulverized. The powdered polymeric material is then discharged from said second zone. The method can therefore be effected continuously in a single apparatus.
A method of producing a powder from polymeric material in an extrusion device, said extrusion device comprising a barrel having an internal surface defining a hollow cavity extending longitudinally within said barrel, screw means rotatable in and extending longitudinally with respect to said hollow cavity, said barrel having opposed first and second end regions, polymeric material feed means disposed in said first end region and communicating with said hollow cavity, powder discharge means disposed in said second end region and also communicating with said hollow cavity, said hollow cavity, intermediate said first and second end regions, being divided into at least first and second zones, heating means in thermal communication with at least said first zone and cooling means in thermal communication with at least said second zone, comprising the steps of:
Dependencies are inferred from the claim text.