Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1985-07-08
1988-06-28
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264178F, 2642107, 2642108, 2642888, 264DIG5, 264DIG13, 425198, 425199, 425817C, B29C 6722, B29C 4730, C08J 906
Patent
active
047537620
ABSTRACT:
A method of forming foamed fibers which comprises the steps of forming a melt of a polymer of fiber-forming molecular weight in which is admixed a blowing agent, and a closed-cell-forming additive, extruding said melt through a spinnerette, quenching said melt downstream of said spinnerette under conditions at which bubbles form in said melt, and drawing said melt as it is quenched to produce a foamed fiber having fine bubbles contained therein is disclosed. The product fibers may contain substantially only closed-cells and/or substantially uniform cross sectional area cells.
REFERENCES:
patent: 4501711 (1985-02-01), Senuma et al.
patent: 4562022 (1985-12-01), Li et al.
Largman Theodore
Li Hsin L.
Mares Frank
Oswald Hendrikus J.
Allied Corporation
Anderson Philip
Fuchs Gerhard H,.
Hampilos Gus T.
Stewart Richard C.
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