EXTRUDED FILTERING MATERIALS, MANUFACTURE METHODS AND DESTRUCTIBLE SMOKING ARTICLE Russian patent published in 1999 - IPC

FIELD: production of materials for manufacture of cigarette filters. SUBSTANCE: filtering material contains plastic material or inorganic substance with melting point above working temperature, polycaccharide expansion medium, binder and water. Method involves feeding mentioned components into extruder and subjecting to extrusion process including reduction of pressure upon extrusion through discharge tip of extrusion head up to about 70 bar to cause swelling of extrudate for obtaining cellular structure of material, easily destructible in natural medium into natural products. EFFECT: increased efficiency and controlled ecology. 30 cl, 1 dwg, 10 tbl