B - Operations – Transporting – 29 – B
Patent
B - Operations, Transporting
29
B
B29B 9/10 (2006.01)
Patent
CA 2537760
Using the method, expandable plastic granulate (G) can be manufactured continuously, with a plastic melt (F) being impregnated using a fluid expanding agent (B) and the impregnated melt being granulated. The method is carried out by means of a plant, which includes the following components: - at least one pressure producing feed apparatus (10) for the melt, which is in particular a volumetrically pumping feed apparatus, - a metering apparatus (9) for the expanding agent, - contacting and homogenising apparatus (2) for the impregnation of the melt, - at least one cooler (3) for the impregnated melt, - an underwater granulator (6) and - a plant control (1). The granulation is carried out using a liquid which is used in the granula- tor as a cooling and transport medium for the granulate. The liquid is in particular water or a brine. An elevated pressure is exerted by the liquid used during granulation, due to which an expanding action of the expand- ing agent in the not yet solidified granulate is at least partly suppressed. A regulation of the parameters to be set for the granulation, namely the temperature and pressure of the impregnated melt is effected at the inlet of the granulator. In this regulation, measurements of the named parame- ters are made and also measurement values are compared with desired values and deviations from the desired values due to the unit control are used to influence a heat take-up from the impregnated melt by the cooler or coolers.
Passaplan Claude
Scherrer Herbert
Fetherstonhaugh & Co.
Sulzer Chemtech Ag
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