Colour Chronicle - June 2013

TEXTILE
Fibre Properties
Dye affinity
14
12
10
8
6
4
2
low
high
0
0 2 4 6 8 10 12 14
Optical Yield
Fibril cross-section
% amount of dye applied
Optical yield of the dye goods
How much dye is required for a given depth
of shade? The dye requirement increases
when a change of material takes place in the
following direction:
– higher degree of delustering
– finer filaments (microfibres)
– filament cross-sections other than round
Saturation limit of the fibre
The saturation limit for acid dyes, especially
of the disulphonated type, and disulphonated
metal complex dyes is easily determined.
It is reached when further additions of
dye and continued lowering of the pH of
the dye bath produce no increase in depth,
even with prolonged dyeing. The nearer to
the saturation point limit of the fibre the
dyeing takes place, the lower the wet fastness
properties and the higher the demand on
the combinability of the dyes used as ternary
combination elements.
Rate of exhaustion
Compared to wool and silk | Dyeing: 2.5% Nylosan Blue N-5GL 200 | pH 4.5, liquor ratio 20:1
Dye affinity
Comparison of number of binding points for acid dyes
18
16
14
12
10
Wo
8
6
4
Ms
2
PA
0
0 2 4 6 8 10 12 14 16 18
Rate of dye distribution
Dye distribution on the fibre surface
(levelling out at 98°C, pH 5 )
Optical Yield
Fibril fineness
Degree of mattness
9 COLOUR CHRONICLE__JUNE 2013