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US 5,034,250 AGranted
Method for reducing threadline breakage
AssigneeE. I. Du Pont de Nemours and Company
InventorEarl W. Guertin
Life of this patent
Estimating the term…
Abstract
A process is disclosed for reducing yarn threadline breakage during the washing step of a wet spinning operation to make fine denier yarns.
Claims5
A process for treating a plurality of never-dried yarn threadlines with a liquid bath comprising the steps of:
- a) separating the never-dried yarns to be treated by a threadline separation means such that they are spaced apart a distance of at least 0.64 cm from each other;
- b) passing the spaced apart yarns from the threadline separation means to the first of a pair of rolls driven by a speed controlling means such that the rolls in the pair are turning at surface speeds having a difference of less than 0.05%;
- c) turning the never-dried yarns around the second of the pair of rolls;
- d) treating the yarns by contact with a liquid bath as the yarns pass between the rolls;
- and
- e) removing the yarns from the rolls.
3 more elements
Dependencies are inferred from the claim text.