| Autor: |
Foster, Peter W., Wickramasinghe, G. L. D., Gunasekera, U. S. W., Cork, C. R. |
| Zdroj: |
Abstracts of the Fiber Society Symposium; 2003, p37-38, 2p, 1 Diagram, 2 Charts |
| Abstrakt: |
This study focuses on how to use pressurised labyrinth seals to contain a variety of fluids, including water, around a running thread line. With appropriate design of jet, continuous filament yarns can be twisted to very high levels and with 167 f34 polyester, twist levels as high as 2900 tpm can be achieved at speeds of 1500 to 2000 meters/minute. Such levels of twist are as high as one can go, before secondary twisting of the already twisted yarn sets in. They are in fact the levels needed for satisfactory false-twist texturing. In the false-twisting work, heating has been carried out using either superheated steam or hot compressed air. The heat content of the steam is higher than that of air, so with steam lower texturing temperatures can be used. However, in terms of the final product there is still difference between the two media. As there are no moving parts and because filament yarns are very strong, jet twisting avoids breaking filaments and is a very gentle process that can be used at high speeds with sensitive yarns. Jet twisting by the use of water, combined with prior steam or hot air heating provides a new route for the exploration of problems in the field of false-twist texturing. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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