FOAMED POLYESTER EXTRUSION EQUIPMENT WHICH CAN BE USED IN PLANTS FOR PRODUCING SHEETS, BOARDS OR TUBES OF FOAMED POLYESTER
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United States of America Patent
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app pub date -
Aug 3, 2015
filing date -
Dec 30, 2008
priority date (Note) -
Abandoned
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Abstract
Foamed polyester extrusion equipment has two co-rotating screws defining with an internal walls of an insulated frame, first degassing zone between a feeding zone at a feeding inlet for polyester and a first tight zone, a second degassing zone downstream of the first degassing zone, foaming agent inlet zone downstream of the second degassing zone and a pumping end zone for melted material downstream of the foaming agent zone. The first degassing zone carries out forced atmospheric degassing at lower temperature and has a first vent stack adjacent the first tight zone. The second degassing zone carries out vacuum degassing at a temperature equal to or greater than the melting point of the treated polyester material. The first degassing zone has, upstream of the first vent stack, a nozzle for inlet of preheated nitrogen gas to entrain vapours.
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