Process for making hollow nylon filaments

Details Process for making hollow nylon filaments Process for making hollow nylon filaments

1994-03-14

1995-08-08

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With twining, plying, braiding, or textile fabric formation

28254, 28271, 57287, 57288, 57289, 57310, 264168, 26417714, 2642093, 2642095, 2642108, 2642888, 2642905, D01D 524, D01D 5253, D02J 108, D02J 122

Patent

active

054396263

ABSTRACT:
A melt spinning process and the nylon hollow filaments and yarns made by such process which includes extruding molten nylon polymer having a relative viscosity (RV) of at least about 50 and a melting point (T.sub.M) of about 210.degree. C. to about 310.degree. C. from a spinneret capillary orifice with multiple orifice segments providing a total extrusion area (EA) and an extrusion void area (EVA) such that the fractional extrusion void content, defined by the ratio [EVA/EA] is about 0.6 to about 0.95, and the extent of melt attenuation, defined by the ratio [EVA/(dpf).sub.S ], is about 0.05 to about 1.5, in which (dpf).sub.S is the spun denier per filament, the (dpf).sub.S being selected such that the denier per filament at 25% elongation (dpf).sub.25 is about 0.5 to about 20 denier; withdrawing the multiple melt streams from the spinneret into a quench zone under conditions which causes substantially continous self-coalescence of the multiple melt streams into spun filaments having at least one longitudinal void and a residual draw ratio (RDR) of less than 2.75; and stabilizing the spun hollow filaments to provide hollow filaments with a residual draw ratio (RDR) of about 1.2 to about 2.25.

REFERENCES:
patent: 3728428 (1971-06-01), Turner
patent: 3745061 (1971-07-01), Champaneria et al.
patent: 3924988 (1972-05-01), Hodge
patent: 4444710 (1982-02-01), Most, Jr.
patent: 4548866 (1983-10-01), Cordova et al.
patent: 5356582 (1994-10-01), Aneja et al.
Translation of Japan 59-49,328 (Published Dec. 1, 1984).

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