Patent ID: 6875394
Filing Date: 2005-04-05
Classification: B29C,B29K,D01D

Abstract:
1. A method for processing thermoplastic materials presenting a melting point and a solidification temperature, wherein the thermoplastic material is heated to a temperature higher than the melting point, and wherein said heated material is processed in a forming device by lowering therein the temperature of the thermoplastic material from a temperature at least close to the melting point, to a temperature below the solidification temperature, said method comprising a treatment step selected from the group consisting of: step of subjecting the thermoplastic material, before its passage in the forming device, to a static electric field between a positive electrode in contact with the thermoplastic material and a reference electrode selected from the group consisting of negative electrode and earth, said reference electrode being in contact with the thermoplastic material; step of subjecting the thermoplastic material, during its passage through at least a part of the forming device, to a static electric field between a positive electrode in contact with the thermoplastic material and a reference electrode selected from the group consisting of negative electrode and earth, said reference electrode being in contact with the thermoplastic material; and step of subjecting the thermoplastic material, before and during its passage in the forming device, to a static electric field between a positive electrode in contact with the thermoplastic material and a reference electrode selected from the group consisting of negative electrode and earth, said reference electrode being in contact with the thermoplastic material.