Patent ID: 6309201
Filing Date: 2001-10-30
Classification: B29C

Abstract:
A die for extrusion of a tubular film, the die comprising:a central core;an annular ring arranged around said core so as to define a body having an annular slit for extruding a material;a plurality of inserts peripherally arranged around said ring and mechanically attached to the body of said ring;devices for heating said inserts independently from each other, so as to be able to change, by thermal deformation of said inserts, the thickness of the annular slit;sides of said inserts facing said core are radially arranged around said ring and attached to the body of said ring, while sides of said insets opposite said core are free to radially slide so as to expand in a direction away from said core; andmeans for mechanically attaching said inserts to said ring.