The textile industry uses
two basic methods for coloring fabric – vat dyeing and
textile printing. Vat-dyed fabric or yarn is imparted with
a single color, while textile printing uses a printing process
– usually gravure – to give fabric a particular
design. Two dyeing methods are jet dyeing and continuous dyeing.
In jet dyeing a continuous loop of fabric is dyed at once.
The dye liquor is sprayed through a powerful venturi jet carrying
the fabric with it. After passing through the jet, the fabric
enters a cloth guide tube. Dye liquor and fabric together
circle through the equipment until the proper shade has been
achieved. In continuous dyeing, fabrics are run through a
dyebath. The dyestuff is fixed to the fiber by high temperature
(420°F) or by steaming. High heat thermosol processing
employed when the woven fabric to be dyed contains polyester
fibers or polyester blends.