Oriented crystallization of polymers

Details Oriented crystallization of polymers Oriented crystallization of polymers

1974-06-19

1976-11-09

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

264176F, 425460, B29F 306

Patent

active

039908291

ABSTRACT:
Molten crystallizable polymer is extruded through an orifice. Opposite the orifice on the upstream side is a fixed surface arranged so as to provide in the molten polymer a line of uniaxial extension or a plane of pure shear passing through the orifice. The polymer is extruded at a temperature and flow rate such as to cause a core of crystalline polymer to form in the melt along said line or plane. It is particularly suitable for extruding a continuous filament having a highly crystalline core in a generally less crystalline matrix of the polymer.

REFERENCES:
patent: 1012232 (1911-12-01), Balg
patent: 1999926 (1935-04-01), Garzia
patent: 3540080 (1970-11-01), Goossens
patent: 3618166 (1971-11-01), Ando et al.
patent: 3752614 (1973-08-01), Bremer

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