Classification of the methods for
dyeing of P/C blend
Exhaust dyeing method or batch dyeing method-
This is again classiﬁed in the following three groups-
a. Two bath dyeing
b. One bath one step dyeing
C. One bath two-step dyeing method
Thermosol Dyeing method –
It is again classiﬁed into two groups-
a. Continuous dyeing-
b. Pad batch process (semi-continuous)
Note-In continuous dyeing process may be single bath
or double bath.
Two bath dyeing
This is the process in which we have to dye ﬁrst polyester
part in the HTHP beam dyeing machine or HTHP jet
dyeing machine and the cotton part is dyed in the jigger
Machine used for dyeing of polyester part-
i) HTHP Beam dyeing machine( First commercialized
ii) HTHP jet dyeing machine
Machine used for dyeing of cotton part-
Jigger dyeing machine
PROCESS ROUTE P/C BLEND
MACHINE FOR POLYESTER DYEING-
HTHP beam dyeing machine-
No need to explain the whole process of dying in a beam dyeing
machine. Only some important points we will discuss it-
Advantages & features:
Loading and unloading of the fabric are easy and the time of dyeing is
Dyeing in open width form.
Most suitable for those fabrics that might crease, extend or
abrade when dyed in machines where the fabric is in motion.
Not appropriate for compact fabrics
De-aeration is essential to avoid paler-dyed spots.
A wetting agent helps to eliminate air bubbles within the fabric
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Recipe used HTHP dyeing –
Disperse dye- X%(depends upon the shade)
Sequestering agent-1-2g/l(If required)
Defoamers -.5 to 1g/l
Leveling agent-.5 to 1 g/l
Wetting agent- .5g/l
Acetic acid is enough to get ph=5-6Flow of the liquor usually in the in-to-out direction,
but it can be reversed. Out-to-in flow can compress
the material causing flattening and glazing, particularly
on the inner layers.
Material stationary and liquor is moving.
Batching is very important, during batching tension
should be uniform and optimum.
M:L ratio is 1:10
Both cloth and yarn can be dyed on this machine
HTHP BEAM DYEING MACHINE-
Disadvantages of beam dyeing
The fabric of diﬀerent width can not be dyed together on a
The dyed fabric may be displayed moiré eﬀect if it is
tightly due to shrinkage.
Uneven dyeing may occur if the beam is fully loaded, as the dye liquor has penetrated several layers of fabric.
JET DYEING MACHINE-
HTHP jet dyeing machine
The jet dyeing machine is an extension of the HPHT winch
dyeing machine. Jet dyeing machine developed by
BURLINGTON Industries and ﬁrst machine developed in
1963 by Gaston country Machine co. of U.S.A
Both material and liquor are moving.
Dyeing in rope form.
Fabric speed is usually 200-250mt/min
The jet dyeing can usually be operated up to 140 0 c under high
pressure and having capacity capable of dyeing 100 to 150
kg of fabric at a time.
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DEVELOPMENT IN JET DYEING
Soft ﬂow jet- slow motion of the fabric. Suitable for knitted
Superjet dyeing machine- M:L is 1:1
Aerodynamic jet dyeing machine
Jet created by a mixture of air + water
M:L is 1:1, drain out at a 130c
Multi-nozzle sot ﬂow jet dyeing machine
Advantages of jet dyeing machine:
The fabric of two diﬀerent widths can be dyed at a time so
that two lots can be combined together for dyeing.
No special batching device is required for winding the
fabric as in beam dyeing.
There is no ﬂattening eﬀect or uneven dyeing on the
fabric as in beam dyeing.
Download a full research paper on Dyeing of Polyester and Cotton Blend