Natural dyeings having multifunctionality, i.e. UV-protection
and antibacterial activity, are easily achieved by in situ deposition
of proper metal oxides onto and/or within the cotton knits, followed
by post-dyeing of pre-mordanted substrates with the natural dyes
extracts. The present study clearly indicates that the performance
properties of the obtained dyeings are determined by the fabric
structure, the type and concentration of mordant, the class and dye
extract %, as well dyeing sequence, i.e. pre-mordanting followed by
dyeing or dyeing only.
It can thus be concluded that:
- The UPF value of half-bleached substrates increased by increasing
the weight, thickness as well as reducing the air permeability,
interlock > pique≥parasol.
- Pre-mordanting of the cotton knits with the used metal
salts brings about an improvement in both the K/S and UPF
values, and follows the order: Zr-oxychloride≥Cu-chloride > Znchloride
> Al-chloride > none, keeping the fabric structure (pique)
and the natural dye (madder) constant.
- Post-natural dyeing of pre-mordanted substrates results in a
remarkable improvement in both theK/S as well as theUPFvalues,
and the extent of improvement in the gained properties is determined
by the physical state/chemical structure/concentration of
the natural dye extract, type of mordant as well as the knitted
fabric structure.
- The antibacterial a