Entwässern und Trocknen von EP(D)M

A process for dewatering EP(D)M rubber comprises sequentially: (i) introducing wet EP(D)M rubber, containing up to 50 wt.% water, into a single screw extruder which includes a die plate and an inlet section, wherein the screw has a constant pitch and decreasing channel depth and traverses a shell ca...

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Bibliographische Detailangaben
Hauptverfasser:	KEFFER, ROBERT E, FRAZIER, JAMES R, KELLEHER, KEVIN M, ZIEROLD, DONALD M, GYASI, CHRIS B
Format:	Patent
Sprache:	ger
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 dewatering EP(D)M rubber comprises sequentially: (i) introducing wet EP(D)M rubber, containing up to 50 wt.% water, into a single screw extruder which includes a die plate and an inlet section, wherein the screw has a constant pitch and decreasing channel depth and traverses a shell casing comprising (a) an expeller section and (b) an expander section positioned immediately downstream from (a), with (a) being half the length of (b), and wherein the screw has discontinuous helix flights and a ratio between its length and diameter of 9-15; (ii) conveying the wet rubber through the extruder under conditions sufficient to expel water through (a), to increase pressure across the die plate to 1200 psi or more, to heat the crumb to a temperature of up to 400[deg]F, and to extrude dried crumb containing less than 1 wt.% water; and (iii) collecting dried crumb.