Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1994-02-18
1995-05-23
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264203, 2642103, 2642108, 26421116, B29C 4700, D01D 512, D01F 200
Patent
active
054179092
ABSTRACT:
A process for manufacturing molded articles of cellulose, such as fibers films, which includes (a) providing an aqueous solution comprising cellulose in a tertiary amine N-oxide, (b) extruding jets of the aqueous solution through an extrusion die into a non-precipitating medium for cellulose, the extrusion die having nozzle passages the length L of which is in the range from 200 to 800 .mu.m and the capillary section of which has a length l in the range from 50 to 240 .mu.m and a ratio l/d of length l to its diameter d in the range from 0.5 to 2.0, the molecules of cellulose in the jets of solution being pre-orientated by the extrusion die through a shear force gradient in the nozzle passages, (c) additionally orientating the cellulose molecules by stretching the extruded jets of solution in said non-precipitating medium with a spinning stretch ratio V of linear velocity of the precipitated molded article to the linear velocity of the solution leaving the die in the range 0.5>V>3, and (d) precipitating the molded cellulose articles from said jets of solution by contacting with a precipitating medium without stretching. The shortened shearing section of the nozzle passages allows a reduction of the spinning pressure. The safety of the spinning operation is increased by the low spinning stretch. The stretch interval in the non-precipitating medium is reduced, and the elongation and loop strength data of the spun fibers are improved.
REFERENCES:
patent: 3579625 (1971-05-01), Jacquinet
patent: 4246221 (1981-01-01), McCorsley, III
patent: 5252284 (1993-10-01), Jurkovic et al.
Berghof Klaus
Maron Reinhard
Michels Christoph
Ellis Howard M.
Tentoni Leo B.
Thuringisches Institut fur Textil- und Kunststoff-Forschung E.V.
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