Title:
SPINNERETS AND THIER MANUFACTURE
Document Type and Number:
Japanese Patent JPS5335012
Kind Code:
A
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.
Inventors:
RERANDO ROBAATO HONNEIKAA
GERII RII JIYOONZU
UORUTAA AANESUTO UTSUDO
GERII RII JIYOONZU
UORUTAA AANESUTO UTSUDO
Application Number:
JP10595177A
Publication Date:
April 01, 1978
Filing Date:
September 05, 1977
Export Citation:
Assignee:
DU PONT
International Classes:
B29C48/05; B29C48/345; C22C27/02; C22F1/18; D01D4/02; (IPC1-7): C22C27/02; C22F1/18; D01D3/00