The object of the work was to develop the use of high-pressure steam in order to replace air in air-jets in the production of intermingled yarns, particularly for sewmg threads. The thesis discusses the development of air-jet texturing! intermingling and analysis of the process by earlier workers. Differences between steam-flow and air-flow through jets are discussed. The effects of process parameters on steam-jet intermingling and comparisons of steam-jet intermingled yarns and air-jet intermingled yarns have been studied. The results show that steam-jet intermingled yarn has higher strength, higher elongation, higher loop stability and lower boiling water shrinkage than air-jet intermingled yarn. Core-yarn wetting does not have a significant effect on the steam-jet intermingling process and intermingled yarn properties. Elimination of the wetting system reduces the production cost of steam-jet compared to air-jet. Steam-jet intermingled yarn needs less energy to heat-set after intermingling, as it has been partially heat-set by steam during intermingling. Sewing threads were made from steam-jet intermingled yarns and assessed using industrial sewing specifications. The sewing threads were also subjected to commercial trials. Sewing test results show that steam-jet intermingled sewing thread meets commercial levels of performance. Preliminary investigations revealed that high-pressure water could also be used in intermingling as a replacement of air or steam. It was found that lower core-yarn overfeeds, such as 2.9 %, can be used and therefore higher strength of intermingled yarn could be achieved. Turbulence in water was improved by designing a jet so as to suck air by water through a capillary from the outside atmosphere.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:601663 |
| Date | January 2003 |
| Creators | Wickramasinghe, G. L. D. |
| Publisher | University of Manchester |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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