Method for rapid purging of blowing agents from foamed...

Details Method for rapid purging of blowing agents from foamed... Method for rapid purging of blowing agents from foamed...

B - Operations, Transporting

01

D

183/5

B01D 57/00 (2006.01) B29C 44/56 (2006.01) B29C 71/02 (2006.01) C08J 9/00 (2006.01) B29C 37/00 (2006.01)

Patent

CA 2012906

ABSTRACT OF THE DISCLOSURE Objects of thermoplastic polymer foam such as, e.g., sheeting of polyolefins such as polyethylene, are treated at elevated temperatures effective to rapidly purge the foam of a substantial portion of the residual blowing agent. Significant economies are achieved by reducing the amounts of residual blowing agents (such as flammable, toxic or environmentally hazardous gases) to levels presenting no fire hazard or other safety hazards in times substantially less than required in conventional aging under ambient conditions. The processes can be carried out in ovens or other heating zones which form continuations of the basic production line, with the extracted blowing agents recycled or disposed of by combustion.

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