직/편성물 염색

Solution to problems in washing-off of vat dyeings in jet and overflow machines tested in practice

  • 출판일1996.08
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 265
The critical phase in the vat dyeing of knitted fabric in rope form is the rinsing process, ie the transition from reducing and oxidizing conditions. Both excessively short and excessively long rinsing times cause problems. Conductivity and redox measurements have been shown to be unsuitable for controlling parameters. The high stability of hydrosulphite when air is excluded, ie in a jet dyeing machine, has provided a parameter with which the rinsing step can be optimized. Using titration of the hydrosulphite concentration in the dyebath, the hydrosulphite concentration at the end of vatting can be predicted and set at the desired level. By removing the uncertainty in the concentration of a reducing agent it is now possible to optimize the amount of water required for rinsing and thus to ensure better control of the dyeing process.
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