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REDUCTION OF FIBRILLATION OF LYOCELL FABRIC IN CONTINUOUS DYEING
CONCLUSION
This study showed that regenerated
cellulosic lyocell fiber has the technical
problem of fibrillation generation during
processing. Pre-treated lyocell fabric was
found to have excellent absorbency. It was
found in this study that the fibrillation problem
increased as the lyocell fabric passed
through further processes such as dyeing
and washing. It was further concluded from
the results obtained that the fibrillation can
be controlled by the application of internal
polymer cross-linking agent, which acts as a
linking bridge between cellulosic polymer
chains. After application of cross-linking
agent, dye sites are disturbed because crosslinking
agents attach at hydroxyl group of
cellulose which is also the dye site for
reactive dye. Thus, there are always chances
for cross-linking agent to occupy the dye site
and compete with reactive dye molecules.
This may affect the color strength. fiber
surface analysis showed that the surfaces of
fibres were smoothened after application of
cross-linking agents but shade depth and hue
changed slightly. If pre-treatment cost of
natural cellulosic fabrics and lyocell fabrics is
compared for similar whiteness and
absorbency level then it can be concluded
that lyocell pre-treatment was economical.
This is because of less processes and low
chemical concentrations required for pretreatment
of lyocell fabric. Further, lyocell
fabric has higher absorbency, thus, having
more dye-uptake and less dye wastage than
the other cellulosic fibres. The lyocell fabrics
attained peach-skin effect during wetprocessing,
which is an advantageous factor
over natural cotton and other regenerated
cellulose fibres.
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