METHOD AND DEVICE FOR TRANSFORMING CRYSTALLINE OR SEMICRYSTALLINE POLYMERS

摘要

The invention concerns a method and a device for transforming thermoplastic materials having a melting point and a solidification temperature, which consists in heating the thermoplastic material to a temperature higher than the melting point, whereby said heated material is transformed in a forming device by lowering therein the temperature of the thermoplastic material by a temperature at least close to melting point down to a temperature less than solidification temperature. Said method is characterised in that it consists in subjecting the thermoplastic material before and/or during its passage in the forming device, to a static electric field between a positive electrode in contact with the thermoplastic material and a negative or ground electrode in contact with the thermoplastic material.