B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 67/20 (2006.01) B29C 44/34 (2006.01) B29C 47/12 (2006.01) B29C 47/86 (2006.01) B29C 47/88 (2006.01)
Patent
CA 2064199
2064199 9101212 PCTABS00003 A process for the continuous or semi-continuous production of cellular plastic material from a plastic compound containing a blowing agent and, optionally, other process-regulative substances and additives, comprising: (a) feeding of the raw materials to a plastic processing machine; (b) kneading of the raw materials in the plastic processing machine under conditions of temperature and pressure which will produce an expanding compound upon release of pressure alone; (c) transfer of the plastic compound directly to a cooling zone; (d) cooling of the compound in the cooling zone to a continuous stock having high viscosity and rigidity and an approximately flat velocity profile under pressure formed by an upstream-directed pressure component; (e) optionally, stepless transfer to a braking-retaining zone; (f) build-up of the upstream-directed pressure component until the pressure in the plastic mass in the upstream located zones is sufficient to prevent expansion of the plastic compound; (g) control to expand the compound to the desired density after transfer to a heating/expansion/forming zone.
Ridout & Maybee Llp
Scandinor A/s
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