Cleaner Technology Transfer to the Polish Textile ... - Miljøstyrelsen

hardness in water and extract from textile, spectrophotometer scanning for
dye-stuff content in process water, conductivity for salt measuring, and pH.
Quality assesments To assess the quality of the dyed textiles the dye-houses ordinary quality
assessments were used: washing, water, wet rub, and dry rub fastness, evaluated
on a scale from 1 to 5 with 5 as the best. As always in the dye-houses,
colour and shade were assessed by comparing with the customer samples. The
main part of the experiments has been performed on production lots.
Table 4.
Overview of performed
investigations.
Experiments 50 full-scale tests
Recipes 20 different recipes
Dye-stuff colours Brown, red, black, winered, marine, blue,
turquoise, rose, pink, purple, green, mint.
Shades Very light to very dark
Recipe variations Temperature
°C
Neutralization
±
Detergents
±
Complexing agents
±
Soft water
°dh
No. of rinses
No.
Quality assessments
Scale
Washing fastness
1-5
Water fastness
1-5
Rub fastness, wet
1-5
Rub fastness, dry
1-5
Colour & shade
Qualitatively
Results and discussion
Quality unafffected None of the performed experiments caused quality reductions in the finished
lots, neither when neutralization before hydrolysate rinse were omitted, use of
detergents or complexing auxiliaries were omitted, nor when cold overflow rinse
were replaced by one cold batch rinse followed by a few 95°C hot batch rinses.
Temperature The temperature of the process water in the rinse is the decisive factor for
washing out the dye-stuff hydrolysate. Figure 4 gives an example.
Figure 4.
Temperature dependency of
rinsing.
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