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Introduction: Absolute value for assessing bleached goods is difficult to
define, since they are invariably associated with the subsequent use of
the fiber, yarn or fabric.
The factors which form the basis of any
assessment include:
1. Whiteness
2. Chemical or physical damage
3. Absorbency, particularly of cellulose materials and
blends.
4. Presence of residual non-cellulose matter.
5. Levelness of preparation.
6. Freedom from impurities, e.g., cotton seed
7. Suitability for subsequent processes e.g., spinning,
dyeing etc.
The last
three factors are subjective to the extent that they are best assessed
visually or judged by subsequent processing on plant.
The first
four factors can be measured quantitatively and the basis for such
analysis follows:
Assessment of Whiteness:
Whiteness is
generally assessed instrumentally as physical measurements provide
objective values that are independent of the age and color sensitivity of
the eyes. All instrumental methods illuminate the sample and the measure
the amount of light reflected. They thus have the added advantage that the
illuminant and the viewing conditions can be closely specified. The
assessment ranges from the measurement of reflectance at a single wave
length to a complete spectral scan which can be computer processed to give
a color difference or “Whiteness ../default”. Anders and Daul, one of
which is recommended in the AATCC test method 110, have reviewed these
whiteness indices.
Basic Requirements for Hydrogen Peroxide Bleaching
Water Hardness - How does it affects Textile Processing?
Determination of Water Hardness - How to Test details?
Industrial Water Softening Treatment - A detailed Ion Exchange Method
A simple pretreatment of cotton - Useful tips and recipes of Peroxide Bleaching
Bio-scouring, technique, tips and benefits
Assessment of Bleached Goods
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