Method of keeping nozzle bodies or breaker plates clean during extrusion of polymer melts
AssigneeBayer Aktiengesellschaft
InventorsGerd Wilhelm, Artur Jaschke, Hans-Jurgen Simon, Jens Schmidt, Surinder S. Sandhu
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Abstract
The invention relates to a method of keeping nozzle bodies or breaker plates clean during extrusion of polymer which can be shaped from the melt which comprises preventing the formation of deposits near the nozzle orifices by gassing these orifices at the point of extrusion of the melt, said gas consisting entirely or partly of vapors of substances which have a depolymerizing action on the deposits formed from the melt at the edge of the nozzle orifice.
Claims11
Method of keeping nozzle bodies or breaker plates clean during extrusion of polymer which can be shaped from the melt which comprises preventing the formation of deposits near the nozzle orifices by gassing these orifices at the point of extrusion of the melt, said gas consisting entirely or partly of vapours of substances which have a depolymerising action on the deposits formed from the melt at the edge of the die orifice.
Method of keeping nozzle bodies or breaker plates clean during extrusion of polymer which can be shaped from the melt which comprises preventing the formation of deposits on or near the nozzle orifices by washing or cleaning these orifices at the point of extrusion of the melt by means of a stream of gas consisting at least partly of vapours of a material selected from the group consisting of steam, an amine and an alcohol which have a depolymerising action on the deposits normally formed from the melt at the outer edge of the nozzle orifice.
Dependencies are inferred from the claim text.