These dyes can be used on conventional exhaust machines such as jet and overflow and on exhaust apparatus such as cross-package or beams. And Bezema says that because the whole ‘Go’ dyeing process takes place at such low temperatures it leads to increased process safety due to better control of fixation speeds and reduced hydrolysis of unfixed dye for good colour yields.“If dosage is monitored, sodium carbonate and caustic soda can be added simultaneously to give the best possible levelness,” said Detlef Fischer.
The company adds that rapid fixation does not only improve the exhaust dyeing process, but it also increases productivity in cold-pad-batch (CPB), a technique already well-known for its environmental benefits.
“Standard dyes normally need a minimum fixing time of 12 – 16 hours in the CPB process. If the dwelling time is shorter, not all ternary dyes are fully fixed, so that the colour depth and especially the shade deviate from the setting.
Bezaktiv Go dyes already reach their fully fixed condition at an ambient temperature of 20 to 25°C after a dwelling time of six hours,” according to the company.
