Spinneret
Spinnerets made of a stainless steel alloy containing 28% to 30% chromium, 3.5% to 4.2% molybdenum, and a maximum of 0.15% nickel have unexpectedly good resistance to corrosion when subjected to a KNO.sub.3 /NaNO.sub.2 /NaNO.sub.3 salt bath at about 427.degree. C (about 800.degree. F) for cleaning, as well as unusually good resistance to corrosion when exposed to acrylonitrile polymer spinning solution. The overall corrosion rate, resulting from repeated cycles of spinning followed by salt bath cleaning, is surprisingly low, leading to a long expected wear life. The spinnerets have high strength, with good resistance to bulging in use.
Description
Patent History
Patent number: T959002
Type: Grant
Filed: Oct 27, 1976
Date of Patent: Jun 7, 1977
Inventor: Robert Ellis Clark (Waynesboro, VA)
Application Number: 5/735,993
Type: Grant
Filed: Oct 27, 1976
Date of Patent: Jun 7, 1977
Inventor: Robert Ellis Clark (Waynesboro, VA)
Application Number: 5/735,993
Classifications
Current U.S. Class:
75/126C;
Means Providing A Shaping Orifice (425/461);
Single Inlet, Plural Shaping Orifices (425/464)
International Classification: C22C 3822;
International Classification: C22C 3822;
