Semi-continuous production of solid state polymeric foams

Details Semi-continuous production of solid state polymeric foams Semi-continuous production of solid state polymeric foams

1994-12-13

1997-11-04

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521146, 521180, 521182, 264 453, 264 50, 2641761, 264234, 264237, 264345, 264348, 264DIG13, 264DIG83, C08J 900

Patent

active

056840551

ABSTRACT:
The present invention provides a method for the semi-continuous production of microcellular foam articles. In a preferred embodiment, a roll of polymer sheet is provided with a gas channelling means interleaved between the layers of polymer. The roll is exposed to a non-reacting gas at elevated pressure for a period of time sufficient to achieve a desired concentration of gas within the polymer. The saturated polymer sheet is then separated from the gas channelling means and bubble nucleation and growth is initiated by heating the polymer sheet. After foaming, bubble nucleation and growth is quenched by cooling the foamed polymer sheet.

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Chul B. Park et al., Extrusion of Microcellular Filament: A Case Study of Axiomatic Design, Cellular Polymers, MD-vol. 38, pp. 69-91, ASME 1992.
Vieth, Wolf R., Diffusion In and Through Polymers, Hanser Publishers (1991) Ch. 3.1, at p. 52.

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