Alkali reduction and deep-dyeing
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Before alkali reduction
(raw fabric) |
A result of alkali reduction,
continuous pad steaming method |
It is a fact that black in polyesters dyed using conventional methods appears weaker after twenty to thirty percent alkali reduction. In order to produce a hue that looks jet-black to anyone, it is impossible to obtain ideal results without accurately measuring the fabric’s L*-value and using a deep-dyeing auxiliary capable of bringing it into the 9.0’s. Builders RN and RN-1 both meet these expectations.
In order to produce an ideal jet-black obvious to anyone's eyes in 30% alkali-reduced polyester, the use of an L*-value measuring device is indispensable, as well as a deep-dyeing auxiliary capable of bringing L*-values down to the 9.0's. Builder RN lives up to such expectations.
While reducing the alkali level twenty to thirty percent brings fabric close to its point of deterioration, the resulting fabric feels absolutely wonderful to the touch. However, at this level of alkali reduction, a jet-black tone cannot necessarily be expected. By maintaining an L*-value in the 9.0's, a jet-black tone can readily be attained even in polyester with alkali levels reduced by twenty to thirty percent. That is to say, deep dying is extremely easy to achieve in practical terms for any shade of black with fabric whose alkali levels have been reduced by as much as 30%. |