(Reduction Clearing Agent)
Best and Eco-friendly 'Reduction Clearing Agent' for washing of
'Disperse colour Dyed and Printed Polyester materials.'
PHYSICAL & CHEMICAL PROPERTIES
1. Straw yellow to brown colored viscous ,
2. Typical but harmless odour.
3. Dilutes with water to any extent.
4. Non ionic and anionic blend working over wide range of
5. pH of 1 % solution about 7.0
MECHANISM OF WASHING
After printing and steaming, according to the chemical nature of
the disperse dye and fixation conditions(steaming time, humidity
and temperature), 70 to 90 % of disperse dye gets fixed on
polyester. Some dyes of anthraquinonoid class (Aq class) require
‘higher energy’ for fixation. For example 'Disperse Violet IFBL'
gives more colour value when fixed at 135 centigrade than
compared to when fixed at 130 centigrade (for same steaming
period in HTHP steamer). But being in combination with other low
energy colours, steaming is usually carried out at 130 C.
Washing liquor of printed goods, therefore, is loaded more with
these type of ‘high energy’ Aq class of colours. LyzerKlin RCA
takes care of this parameter.
Disperse dyes of Azoic class (Az class) reduce with hydro -
caustic and get discoloured. Hence their washing is
comparatively easier when compared to Aq class of dyes. Aq dyes
get reduced with hydrous caustic treatment to HAq form, thereby
become water soluble, get spread all over the prints and in
subsequent process when aired, get reoxidised to original form (Aq),
without loss of tinctorial value. Subsequently on getting heat
treatment, these colours develop on polyester, giving soiling of
unprinted area and dulling of printed colours. This tendency has
been taken care of while formulating LyzerKlin RCA. Many of Aq
class of dyes (like 'Disperse Reds') soil viscous heavily
compared to other dyes (Ref. BASF Manual). This tendency has
also been taken care of when washed with LyzerKlin RCA.
While for goods to be carbonised, unfixed colour gets sulphuric
acid treatment. It is well known that 70% Sulphuric Acid is a
solvent to Aq Class of dyes. Water being non solvent, on
dilution & neutralisation the dye precipitates out in original
form. In comparison, Az class of dyes get destroyed in 70%
sulphuric acid. Hence tinting and soiling tendency of Aq type of
dyes persists even after carbonizing. This poses a problem
during carbonising & washing of prints. When subjected to
carbonizing Aq class of dyes dissolve in 70% sulphuric acid,
thereby get spread all over the prints and reappear as original
on dilution during subsequent washing and neutralisation.
Aq class of dyes are resistant to oxidation and their colouring
power persists even after oxidation, i.e., even after peroxide /
hypochlorite/ permanganate bleach. Hydro - caustic treatment if
properly done, completely removes unfixed Az type of dyes
washing off seems to be simple and complete for these dyes.
However; all these conventional treatments do not seem to remove
unfixed Aq class type of colours.
Washing of disperse printed fabric conventionally involves
reduction clearing, bleaching (optional) & soaping processes.
Our recommended process differs from conventional process only
in soaping process where LyzerKlin RCA is used as a soaping
agent. Process box for soaping is high lighted to indicate the
only differentiating process between conventional process &
Process of washing with LyzerKlin RCA.
CONVENTIONAL & RECOMMENDED WASHING
FIRST PROCESS: COLD WASH
1 st & 2 nd end on jig or Cold running water treatment
1 st wash on winch or This removes excess of free
1 st kundi treatment colour, allows the printing
gum to swell.
SECOND PROCESS: REDUCTION CLEARING & WASHING
3 rd & 4 th end on jigger Hydrous 3 - 5 g/l +
2 nd wash on winch NaOH 2 g/l at 80 C.
2 nd kundi treatment At the end Hydrose to test
Positive to Vat Yellow GCN Paper.
5 th & 6 th end on jig or Cold running water treatment
3 rd wash on winch or This removes reduced azoic
3 rd kundi treatment or colors.
THIRD PROCESS: BLEACHING & WASHING (OPTIONAL)
7 th & 8 th end on jigger Either Bleaching with NaOCl
4 th wash on winch 3 g/l available Cl at R.T.
4 th kundi wash Or KMnO4* 2 gm/l + H2SO4
1/2 g /l at R.T.
Removes Gum, Hydrolysed Cols
9 th & 10 th end on jig or For HYPO BLEACH, Cold
3 rd wash on winch or running water treatment
3 rd kundi treatment or For KMnO4* BLEACH, Oxalic
Acid 2 g/l at R.T followed
by cold wash.
FOURTH PROCESS: SOAPING, WASHING & NEUTRALISING
11 th & 12 th end on jigger Soap with LyzerKlin DD 2 g/l
4 th wash on winch + NaOH 1/2 g/l, Removes Aq
4 th kundi wash class of colours, gum, &
broken Az of Colours.
13 th end on jigger Cold running water, no
5 th wash on winch chemicals required.
5 th kundi wash
14 th end on jigger Acetic Acid 1 - 2 g/l
6 th wash on winch Goods at the end should
6 th kundi wash test acidic positively.
THE ROLE OF LYZERKLIN RCA
LyzerKlin RCA removes Aq class of dyes in particular and other
unfixed disperse colours, gums etc., in general. LyzerKlin RCA
has excellent dispersing and wetting property to remove gums and
unfixed disperse colours. It has a powerful complexing
tendencies with Aq type of dyes for their effective removal in
Washed off Colours can be seen in the soap bath even after
proper hydro caustic treatment and bleaching treatment has been
carried out. LyzerKlin RCA produces tint free and bright prints.
LYZERKLIN RCA IN WASHING OF DYEINGS
After the dyeing is over, in a cooling dyeing bath
itself add 1g/l of LyzerKlin RCA may be done. The product can be
added at 130 C. in beam dyeing and at below 100 C. in jet
dyeing. Allow further cooling and circulation for 10 to 15 min.
or till required temperature is reached. The bath is drained &
cooling cold wash with a short circulation is carried out to
complete the process. The reduction clearing of cloth and
cleaning of machine is achieved simultaneously. This is a short
treatment & is good enough for majority of goods going further
for cellulosic dyeing. However; if the cloth is enblamed with
dop dyed yarn at the salvages for brand name etc., the true
colour of the label is shown only after Hydro- caustic
treatment. If the full fastness properties are desirable then
hydrous - caustic treatment is required to be carried out. In
such cases the procedure for printed goods should be followed.
STORAGE: The product enjoys
very good shelf life and warrants no particular storage
conditions. However it is always advisable to have moderate
conditions with the container being recapped tightly after use.
9 to 12 months if stored below 30°c.
30 & 50 & Kgs in Plastic Container.
According to our best knowledge and technical experiments, the above data is true and accurate. Regarding to variety of consumption procedures, it is recommended to evaluate the
information before use.