Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1973-08-17
1976-07-27
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264234, 264237, 425 4C, B29D 2700
Patent
active
039718387
ABSTRACT:
Flat plate-type, rod-type or shaped articles of polystyrene foam are continuously produced from preliminarily expanded beads of polystyrene or a mixture of said preliminarily expanded beads with foamed polystyrene pieces recovered for reuse as raw materials by enveloping the beads with a circulating steam-permeable belt, such as cloth belt, passing the enveloped beads through a pressure sealing conduit capable of throttling and succesively a heating zone in a pressure steam chamber at a temperature between 100.degree. and 125.degree.C, thereby softening and re-expanding the preliminarily expanded beads by steam heating, reducing the apparent volume of the enveloped re-expanded beads in a course towards a pressure sealing conduit at an outlet of the pressure steam chamber, thereby allowing the softened and re-expanded beads to adhere tightly one to another in a continuous foamed mass, or also additionally to a liner material, when accompanied therewith, cooling the enveloped foamed mass while maintaining a limited volume of the enveloped foamed mass, and separating the resulting shaped product of foamed mass from the belt by a set of rollers at the end of processing line.
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Anderson Philip
Philpitt Fred
Polymer Processing Research Institute Ltd.
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