The results recorded in Tables 1 and 2
illustrate the values of the fabric strength
(kg) for the different types of fabric
materials (100 % cotton, 100 % PET and 35
% cotton / 65 % PET blend) dyed at 30°C
with henna and onion skin dyes. The results
show that generally the undyed and dyed
fabrics of the 100 % cotton fabric showed
lower fabric strength compared with the
strength of the blended fabric (35 % cotton /
65 % PET), while the 100 % PET revealed
the highest fabric strength value. On the
other hand, the fabric strength increased
significantly after dyeing with both natural
dyes for the 100 % cotton and the 35 %
cotton / 65 % PET blend compared with the
control, Figure (3). This may be due to yarn
swelling after dyeing, so fabric strength
tends to increase as more points of yarn
would become more active in sharing the
load as a result of swelling when tensile
forces are applied to the fabric. As for the
100 % PET, there was no change in fabric
strength due to dyeing treatments. So these
results revealed that dyeing with these
natural dyes under the dyeing conditions
used in this study would not cause any
deterioration in fabric strength. These
results, however agree with those of El-
Nagar et al. 2005.