MISS ALKA BHARTI
BFAD IVth SEM
Jet dye machine is the most modern
machine used for dyeing of polyester
using disperse dye.
It is similar to winch dyeing and fabric
is processed in continuous loop.
The technique is especially useful for
delicate polyester fabrics but depending
weight, structure, or fabric type can be
was found that in using Winch
machines, there were some inherent
problems. So the Jet dyeing machines when
they came up in the 1970's, were specifically
designed to overcome those shortcomings.
In this machine the dye tank contains disperse
dye, dispersing agent, leveling agent and
acetic acid. Fabric may be jet dyed by placing
it in a heated tube or column where jets of
dye solution are forced through it at
pressure up to 300 pounds per jet.
In the Jet dyeing machine the reel is completely
eliminated. A closed tubular system exists where the
fabric is placed. For transporting the fabric through the
tube a jet of dye liquor is supplied through a venturi.
The Jet creates turbulence. This helps in dye penetration
along with preventing the fabric from touching the walls
of the tube. As the fabric is often exposed to
comparatively higher concentrations of liquor within the
transport tube, so little dye bath is needed in the bottom
of the vessel. This is just enough for the smooth
movement from rear to front. Aqueous jet dyeing
machines generally employs a driven winch reel along
with a jet nozzle.
• The solution is filled in the dye tank and it
reaches the heat exchanger where solution can be
heated which then pass onto the centrifugal pump
and then to the filter chamber.
• The solution will be filtered and reaches the
tubular chamber. Here the material to dye will be
loaded and the winch is rotated so that the
material is also rotated.
• Again the dye liquor reaches the heat exchanger
and operation is repeated for 20-30 minute at
• Then dye bath is cooled down, after material is
SPECIAL FEATURES AND APPLICATION
• This machine can be operated at high
temperature and pressure .
• This system operate at low liquor ratio (ratio
of mass of dye bath to mass of fabric in
dyeing machine) so, this operation consume
less water and chemical.
• Frequent movement of fabric round the jet
through the machine reduces the tendency of
TYPES OF JET DYEING MACHINE
• After incest fating the dyeing results under
different conditions such as development of new
fabrics, interaction position of jet, quantity of the
dye liquor to be present in around the fabric and
the type of impact of the dye liquor on the fabric
in the jet area.
Some Jet dye machines are as follows:
• Overflow Dyeing Machine
• Soft-flow Dyeing Machine
• Airflow Dyeing Machine
ADVANTAGES OF JET DYEING MACHINE
• Dyeing time is short compare to beam dyeing
• Production is high compare to beam dyeing
• Low consumption of water.
• Short dyeing time.
• Can be easily operated at high temperatures
• Comparatively low liquor ratios, typically
ranges between 1:4 and 1:20.
• Fabrics are handled carefully and gently.
DISADVANTAGES OF JET DYEING MACHINE
• Cloth is dyed in rope form so there
risk of entanglement and chance
• Equipment and maintenance costs
high, foaming can be a problem,
some fabric may be abraded in
• Chance for crease formation.
LIMITATIONS OF JET DYEING MACHINE
• High initial investment and maintenance
• Limited accessibility during the dyeing
• Foam forming substance is to be avoided.
• Any roughness of the inside surface cause
damage to cloth.
• In case cloth breakage, re-threading is