Process for extruding plasticized open cell foamed cellulose ace

Details Process for extruding plasticized open cell foamed cellulose ace Process for extruding plasticized open cell foamed cellulose ace

1978-03-13

1979-12-25

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

131268, 264177R, 264211, 264DIG5, 264DIG13, B29D 2700

Patent

active

041805364

ABSTRACT:
A melt extrusion process for producing a low density open cell filtering element for an aerosol such as tobacco smoke from plasticized cellulose acetate. A mixture of cellulose acetate, plasticized, a volatile liquid blowing agent which is at least a partial solvent for the cellulose acetate and a nucleating agent are melt extruded under conditions wherein the melt is subjected to high shear, the loss of the blowing agent through back flow is prevented, the melt is reduced in temperature prior to extrusion and the extrudate is conditioned in a hot air chamber and then sized in a sizing die.

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Prause, John J. "Twin-Screw Extruders," in Plastics Technology, Mar. 1968, pp. 52-57.

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