Dewatering and drying of EP(D)M

A process for continuous dewatering/drying of EP(D)M rubber is disclosed. The process comprises continuously charging wet EP(D)M crumb into a single screw extruder having particular structural features and conveying the wet crumb through the length of the extruder under conditions sufficient to expe...

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Bibliographische Detailangaben
Hauptverfasser:	KEFFER, ROBERT E, GYASI, CHRIS B, KELLEHER, KEVIN M, ZIEROLD, DONALD M, FRAZIER, JAMES R
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BLASTING DRYING DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM HEATING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS LIGHTING MAKING GRANULES OR PREFORMS MECHANICAL ENGINEERING PERFORMING OPERATIONS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WEAPONS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A process for continuous dewatering/drying of EP(D)M rubber is disclosed. The process comprises continuously charging wet EP(D)M crumb into a single screw extruder having particular structural features and conveying the wet crumb through the length of the extruder under conditions sufficient to expel water, increase the pressure across the die plate of the extruder and heat the crumb. The dried crumb thus extruded is characterized in that it contains less than 1% water. The single screw extruder suitable for the process comprises an inlet or feeding end, an expeller section which contains cage bars, an expander section having a solid shell cover positioned immediately downstream from the expeller section, a die plate and a screw having a constant pitch and a, preferably gradually, decreasing channel depth.