Process and apparatus for underwater pelletization of polymers

The underwater melt cutter die assembly has a die plate (60) or die body having one or more die holes (64) through which molten polymer flows and having a polymer exit face (61). The polymer exit face (61) is in contact with a nonmetallic thermal insulator (69) having a first far face (70) opposite...

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Bibliographische Detailangaben
Hauptverfasser:	JACKSON, RICHARD, ALAN, WAGGONER, MARION, GLEN, ROYER, DENNIS, JACK
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY MAKING GRANULES OR PREFORMS 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 SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR RELEVANT APPARATUS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	The underwater melt cutter die assembly has a die plate (60) or die body having one or more die holes (64) through which molten polymer flows and having a polymer exit face (61). The polymer exit face (61) is in contact with a nonmetallic thermal insulator (69) having a first far face (70) opposite the face in contact with said polymer exit face (61), said first far face (70) is in contact with a backup plate (72) having a second far face (73) opposite a face in contact with said nonmetallic thermal insulator (69), and said second far face (73) is in contact with an abrasion resistant material (71). The die holes (64) can have a reverse taper and are straight. The molten polymer is forced through one or more die holes (64) and as said polymer emerges from said die holes (64) it comes into contact with water and is simultaneously cut.