Print pastes contain thickeners ''thickening agents'' that are often
natural or synthetic polymers. The role of thickeners is
thickening of print paste and making it more viscous to avoid
lateral diffusion and improve finesse of motifs. The aim of
this
paper is to study the effect of type and concentration of
thickeners in print paste (using vat dyes and Two-stage method)
on fastness properties and color yield. Thickeners used usually, in
this method, are sodium alginate, guar gum and starch ether.
Conventional print paste recipe applied in this method give low
fastness to dry and wet rubbing when we print in dark shade. We
used only two thickeners in various concentrations, and then the
fastness to rubbing is evaluated. The viscosity of print pastes is
measured because of its effect on the penetration of the print
paste across the fabric, thus its effect on color yield.
In this study we used ultrasonic technology as a means of
enhancing dyeing process efficiency of polyester fibers with
disperse dyes, which had frequency 42kHz and, we studied the
behavior of dye when the polyester dyed with (US) and with
traditional dyeing methods (without US).
In this study, samples of cotton fabric were dyed using direct dye
by the traditional method as well as using microwave energy at
different energy levels. It was noted that the use of microwave
energy increase the dye exhaustion at the used energy
levels
compared to the traditional method, as well as improving the
fastness to washing and wet rubbing.
