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DYEING PROCEDURE
contd. from Page
1
SEMI - INCESSANT METHODS FOR COTTON MATERIAL
All the above application, where padding is required
and below mentioned method is to avoid "shadowing” or " effects in the dyeing":
v
Small pad
trough "V" or "U" shaped with a capacity of 5-10 liters.
v
High
running speeds suiting the needs of the process and setting the padding mangle
to give squeeze. Usually 60 or 70% expression may be kept for cotton goods. The
mangle squeeze be even for the padded goods and the through, fed with dye liquor
to a constant level all the time.
v
In
dye- fixing operations, involving steaming in particular, adding Resist Salt is
suggested to padding liquor to the same with nullify reductive action.
Recommended that add 5 to 10 parts sodium bicarbonate
(pre-dissolved) and 2 to 5 parts Calsolene Oil HS to the padding solution at 200-
230C. Using a wetting agent and 10 parts of dissolved common salt can
minimize migration / Glauber's salt (unhydrous) to give minimum pick up.
Diffusion into viscose rayon is by batching and storing for at least One or more
house prior drying. Dry at 100-120oC for 1-2 minutes in hot / on
cylinders set to dry slowly. Wash to clear agent and unfixed dye.
Method of Pad-Batch
Pad liquor composition:
|
'M' dyes |
- X parts |
|
Wetting agent |
- 2-5 parts |
|
Urea (wherever necessary) |
- 50-200 parts |
|
Soda Ash |
- As per table 1 |
|
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|
Total |
- 1000 parts |
PROCESS:
Dissolve
dye urea and wetting agent .The dye solution and alkali are mixed just before
padding . The goods are padded in above pad liquor solution and immediately
batched on plastic sheet and kept for 2 hours and then washed
Procedure for Washing to maximize wet- fastness properties, brightness and
purity of shades with consistent dyeing results, it is necessary to give a
through 'Soaping' to clear - off un reacted hydrolyzed dye from the dyed fabric.
The dyed fabric is rinsed repeatedly in cold water to remove most of the
alkali, salt and unfixed dye present and rinsed again in warm water not higher
than 60oC. Then run in a bath containing.
Anionic detergent, 1-2 gms /liter for 15 minutes at the boil. Then rinse in
warm water (up to 60oC) and finally in cold water. The most
satisfactory results in washing - off particularly for piece goods, are obtained
by employing an open soaper or perforated Beam - washing machine. If such
equipments are not available, conventional ones like jig or winch may be used
.for yarn in the hank form open - vat is employed and for yarn in package form
the package -dyeing machine itself is used.
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The information given above is in good faith and to the best of our
knowledge but certainly without our liabilities.
© Magnum Corporation, Bhavnagar,
Gujarat - INDIA
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