B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/673
B29C 35/06 (2006.01) B29C 44/08 (2006.01) C08J 9/12 (2006.01)
Patent
CA 1292347
ABSTRACT Process for reducing the density of an extruded foam board of a thermoplastic resin The density of an extruded foam board (32) of a thermo- plastic resin which board has a thickness of 1 cm or more is reduced by exposing the foam board simultaneously or in sequence to heated air and steam. The density reduction can be carried out in an expansion device (11) which comprises at least one chamber 12 in which simultaneously an atmosphere of steam and heated air is maintained. The chamber (12) is provided with a steam inlet port (14) which is in communication with a steam source (16) and with an air inlet port (18) which is in communication with an air source (20). The invention allows to control the density reduction of a foam material without influencing the supply of the installation and under atmosphere pressure. Figure to be published: Figure 2 C-35,071
548318
Eschenlauer Georges
Vo Chau V.
Smart & Biggar
The Dow Chemical Company
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