Dry spinning process with hot air and with spinning cell outputs

Details Dry spinning process with hot air and with spinning cell outputs Dry spinning process with hot air and with spinning cell outputs

1989-09-22

1991-05-07

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

With printing or coating of workpiece

Anti-stick or adhesion preventing coating

264206, 26421117, D01F 618, D01D 504

Patent

active

050135040

ABSTRACT:
A process for the dry spinning of synthetic polymers, in particular polyacylonitrile fibres, from solutions in high polar solvents, such as dimethylformamide, which are heated to 100.degree.-150.degree. C. shortly upstream of the spinneret and spun there by spinnerets having a certain shape, and in the spinning cell the specific energy supply is at least 0.090 kWh per m.sup.2 of heated cell area, the cell is charged with at least 70 m.sup.3 (S.T.P.) of hot air per hour, and the filaments are treated in the lower part of the cell with water or aqueous preparations, so that the temperature of the filaments which leave the cell is decreased below 110.degree. C. Under these conditions, the unexpectedly high spinning cell outputs of at least 20 kg of PAN solid per spinning cell per hour can be achieved without yellowing or self-ignition of the filaments occurring.

REFERENCES:
patent: 3458616 (1969-07-01), Guess, Jr. et al.
patent: 4457884 (1984-07-01), Reinehr et al.
patent: 4804511 (1989-02-01), Pieper et al.

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