Process of making a laminated spinneret

Details Process of making a laminated spinneret Process of making a laminated spinneret

1976-09-07

1977-10-18

Baldwin, Robert D.

Metal treatment

Compositions

Heat treating

148 203, 148127, D01D 300

Patent

active

040544680

ABSTRACT:
A corrosion-resistant spinneret, suitable for spinning filaments of poly(p-phenylene terephthalamide) from a viscous solution of the polymer in 98-100 percent sulfuric acid, is prepared from a plate of tantalum alloy or stainless steel which is clad on one face with a layer of pure tantalum. A spinneret blank is formed, counterbores are drilled through the plate and partially into the tantalum layer, the blank is annealed, spinneret capillaries are formed from the counterbores through the tantalum layer to the exit face of the spinneret, the face is polished to remove protrusions, and the face is hardened by heat-treatment in nitrogen. Uniform capillaries having a diameter of about 0.002 inch (0.05 mm) and a length greater than about 0.005 inch (0.13 mm) can be formed in spinnerets without breaking tools used in their production.

REFERENCES:
patent: 1791785 (1931-02-01), Austin
patent: 2965924 (1960-12-01), Hull
patent: 3137937 (1964-06-01), Cowan et al.
patent: 3210451 (1965-10-01), Manning et al.
patent: 3279284 (1966-10-01), Ogden et al.

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