Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work – To degas or prevent gas entrapment
Patent
1995-03-20
1997-09-30
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Vacuum treatment of work
To degas or prevent gas entrapment
264 37, 264DIG69, 425203, B29C 4776
Patent
active
056723040
ABSTRACT:
The invention relates to a method for manufacturing a foaming synthetic material, for example, polystyrol, by means of an extruder, in whose entry the synthetic material is fed, to which by means of a fumigation aperture foaming gas in a liquid form, for example pentane, is introduced at a pressure maintaining the foaming gas in its liquid form, whereby throughout a following extruder region, the synthetic material provided with the foaming gas is homogenecised. For processing the reusable synthetic foam, this foam is supplied in a shredded to the extruder, from which prior to the fumigation aperture by means of a degassing aperture gasses contained in the synthetic foam are extruded, whereby the degassing occurs so far away from the entry of the extruder that the synthetic material has at least reached a doughy state in the region of the degassing aperture, and degassing and fumigation are performed at such a distance from one another that the foaming gas supplied to the fumigation aperture cannot reached the region of the degassing aperture against the current of the synthetic material.
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Keilert Jurgen
Nogossek Alfred
Kuhns Allan R.
Rieter Automatik GmbH
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