Plastic article or earthenware shaping or treating: apparatus – Continuous filament forming or film casting means with...
Patent
1978-09-06
1981-05-12
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Continuous filament forming or film casting means with...
264 24, 264176F, 4251748E, D01D 500
Patent
active
042669189
ABSTRACT:
Method and apparatus are provided for producing a filament from molten rapidly crystallizing fibre-forming thermoplastic polymers. The apparatus includes a chamber for such molten crystallizable polymer having an electrically conductive orifice at one end of such chamber. Means are provided for applying sufficient pressure to the column of molten crystallizable polymer to form a flat meniscus at the orifice. An apertured plate of electrically conductive material (e.g. steel) is disposed a predetermined distance from the orifice. Finally, means are provided for applying a high voltage D.C. between the orifice and the apertured plate creating an electrostatic field which exerts a force on the column of the fluid (molten) polymer. Above a certain critical field strength the flat meniscus at the orifice is deformed into a conical shape from which a fine continuous jet of molten polymer is drawn. Subsequent crystallization of this jet yields a continuous fibre which can be drawn of otherwise treated in separate finishing operations so as to optimize its properties. Thus, the high pressure extrusion used in the past to form filaments is obviated.
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"Electrically Driven Jets", Taylor, Proc. Roy. Soc. London, A. 313, 453-475, (1969), London.
Pulp and Paper Research Institute of Canada
Woo Jay H.
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