IMPROVEMENTS RELATING TO FILTERING MATERIALS

摘要

FIELD: filtering materials. SUBSTANCE: extruded filtering material which is destructible and includes plastic material or inorganic substance whose melting point is higher than the working temperature, polysaccharide expansion medium, binder and water. These components are supplied to extruder and subjected to extrusion which includes lowering of the pressure after extrusion from head tip up to a value near 70 bars to provide for swelling of extrudate to produce cellular structure. When the elements of tobacco smoke are exposed to normal natural weather conditions they are disintegrated without leaving the melted amalgamation of plastic or inorganic substance. EFFECT: higher efficiency.