Dyeing, Finishing & Drying
can be dyed in slurry form while uncut tow can be dyed in conventional
dye jigs. It is sometimes necessary to bleach flock before dyeing
in order to obtain the full shade value, especially with delicate
pastel shades. For special applications, solution-dyed yarns can be
used for maximum lightfastness.
Flock must be chemically finished in order to perform satisfactorily
during electrostatic or mechanical application. The finish can be
applied to the tow prior to cutting (a procedure usually utilised
for AC flocking), or to the flock as part of the dyeing procedure.
The type of finish will vary according to flock type and method of
agents are selected to impart:
and a soft hand;
"flow" and siftability during the flock feeding operation;
conductivity (for electrostatic flocking).
Flock is normally tumbled or cyclone-dried to achieve optimum moisture
content for the application process.