APPARATUS FOR FILTERING PLASTICIZED THERMOPLASTICS AND A FILTER ELEMENT THEREFOR

摘要

A device for filtering plasticised thermoplastics has a housing (1) with at least one supply channel (6) for the material to be filtered, via which said material is taken to the inlet side of at least one filter unit (3). The filtrate passes through fine holes (7) in the filter unit (3) and passes from its discharge side into at least one outlet channel (9) leading out of the housing (1). The inlet side of the filter element is scraped by the edges of doctor blades (11) moved in relation to said filter element (3), which guides the residues along the surface of the filter element (3) to at least one discharge channel (12). In the residue discharge direction the region (20) provided with holes (7) of the filter element adjoins an unperforated region (21) which is also scraped by the doctor blades (11). In the surface of the unperforated region (21) facing the doctor blades (11) there are grooves (29), the direction of which crosses that of the edges (24) of the doctor blades (11) extending over said grooves (29). The thickened compound on the unperforated region (21) is thus taken in concentrated form to the discharge channel (12).