UNDIRECTIONALLY ROTATING TWIN-SCREW EXTRUDER AND KNEADING METHOD USING THE SAME

PROBLEM TO BE SOLVED: To provide a undirectionally rotating twin-screw extruder suppressing color change and carbonization of a thermal plastic resin caused by heat deterioration during a kneading process and suitable for obtaining the kneaded material of the thermal plastic resin excellent in color...

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Bibliographische Detailangaben
Hauptverfasser:	KAWAZOE SHINYA, OTA YOSHIO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS MAKING GRANULES OR PREFORMS METALLURGY MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a undirectionally rotating twin-screw extruder suppressing color change and carbonization of a thermal plastic resin caused by heat deterioration during a kneading process and suitable for obtaining the kneaded material of the thermal plastic resin excellent in color shade, and physical properties, tensile strength and tensile elongation, by injecting carbon dioxide during melting and kneading of the thermal plastic material to reduce the viscosity of the melted resin and prevent shear heating. SOLUTION: This undirectionally rotating twin-screw extruder has the specific torque of a gear box being 150-400 N.m/cm , and the screw configuration of a first kneading zone comprising a zone A showing the highest pressure peak, a zone C showing a pressure peak lower than that of the zone A, and a zone B, which is a trough between the pressure peaks of the zones A and C, and arranging the zones A, B, and C in this order along the extrusion direction, and is equipped with an injection device for injecting carbon dioxide in the zone B.