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US 6,875,394 B2Granted
Method and device for transforming crystalline or semicrystalline polymers
AssigneeInternational Brain System S.A.
InventorJoël Soulier
Life of this patent
Estimating the term…
Abstract
A method for processing thermoplastics in a shaping device, whereby before and/or during its passage in the shaping device the thermoplastic is submitted to a static electrical field.
Claims25
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.
4 more elements
A method for processing a thermoplastic material containing at least one compound selected among the group consisting of crystalline polymers, crystalline copolymers, semi-crystalline polymers and semi-crystalline copolymer, said compound presenting a melting point, a crystallization temperature lower than the melting point, and a glass transition temperature,
- in which the material is heated to a temperature higher than the melting point of the compound, and
- in which said heated material is processed in a forming device by lowering therein the temperature of the material from a temperature higher than the crystallization temperature to a temperature lower than the glass transition temperature of the compound,
- 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 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;
- 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
- whereby the material is subjected to a static electric field at least in respect of a temperature higher than the glass transition temperature.
5 more elements
Dependencies are inferred from the claim text.