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Spinning process
| Details |
Inventors: Yang, Hung H.;
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Primary Examiner: Woo; Jay H.
Assistant Examiner:
Attorney, Agent or Firm:
Improved aromatic polyamide fibers from aromatic polyamides whose chain-extending bonds are either coaxial or parallel and oppositely directed are obtained by dry spinneret wet spinning into a shallow coagulating bath having an orifice in its bottom for removal of coagulating liquid and fibers wherein no more than a minor portion of coagulating liquid is lower than the entrance of the bath orifice in the proximity of the bath orifice. Preferably, no more than 10% of the coagulating liquid is lower than the entrance of the bath orifice and most preferably none of the coagulating liquid is lower than the entrance of the bath orifice. |
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DETAILED DESCRIPTION The process of the present invention is effective to provide increased tenacity for all para-oriented aromatic polyamide yarns, but usually linear densities are from 20 to 4500 denier (22 to 5,000 dtex) and preferably are 200 to 3,000 denier (222 to 3333 dtex), and linear densities of single filaments are usually from 0.
5 to 3.
0 denier (0.
56 to 3.
33 dtex) and preferably are 1.
0 to 2.
25 denier (1.
1 to 2.
5 dtex).
The present invention requires uniform, nonturbulent flow of coagulating liquid toward the bath orifice.
In a simple coagulating bath without any special means for introducing coagulating liquid to the bath, uniform nonturbulent flow can be accomplished by providing a bath of sufficient width to provide, by gravity flow, uniform, nonturbulent flow of coagulating liquid in the proximity of the orifice.
The orifice size should be sufficiently small so that in operation the orifice is filled with coagulating liquid (and filaments) at all times.
In order to maintain uniform nonturbulent flow at the orifice, coagulating liquid should be introduced at locations remote from the orifice.
Except when a jet device immediately follows the orifice, it is preferred that no tubes or extensions of the orifice be used.
The approach to the orifice entrance may be suitably tapered to promote uniform nonturbulent flow.
Also, the bottom of the bath may be contoured to promote uniform nonturbulent flow.
Preferably the depth of the coagulating bath is no more than 20% of the bath width in the area of nonturbulent flow.
Careful vertical alignment of the spinneret and orifice is critical to obtaining the improvement provided by the present invention.
For spinning on a small scale, e.
g.
, 20 filaments, a suitable bath width might be about 2.
5 inches (6.
35 cm) in combination with an orifice having a diameter (or width) of 3.
1 mm which may have a tapered approach having a beginning diameter of about 12 mm.
For larger scale spinning, e.
g.
, 1,000 filaments, a suitable bath diameter (or width) might be about 23 cm in combination with an orifice diameter (or width) of 9 mm which may have a tapered approach having a beginning diameter of about 28 mm
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