Kier boiling is a scouring process for cotton and linen in which the fibers are treated for removal of impurities by boiling with a 1% answer of caustic soda. Its predominant objective is to position off numerous the herbal impurities paying homage to wax, wood fragments and oil stains. Kier boiling process of cotton is conducted in a kier boiler and the cloth is scoured in rope sort by alkali liquor. Kier is an immense cylindrical iron vessel. The kier may perchance also smartly smartly be open one as closed one and horizontal or vertical.
Open kier: Open kier is now not an air tight kier and scouring temperature is one hundred oC for 24 hrs.
Closed kier: Closed kier is air tight. Scouring temperature is 120-130 oC for 6 hrs.
Kier skill: 200 kg 5000 kg however industrially 2000 kg kiering is intensely steady.
Standard recipe: The extent of exceptionally numerous chemicals used in a kier boiling may perchance also smartly fluctuate in accordance with,
Hardness of water
Quality / Quantity of cotton
Fabric improvement / texture, yarn twist and the like.
But in often times the following portions of the chemicals are used:
Caustic soda (Strong) 2- 5% owf
Soda ash (real searching) 0.5 1.0%
Sequestering agent 0.2-0.5%
Wetting agent + Detergent 0.5-1.0%
M : L 1:5 to 1:7
Temp one hundred oC 120 oC
Time 8 hr (one hundred oC) 2 hr (120 oC)
Characteristics of kier boiler:
Heating is applied by riding immoderate strain steam, generated in an impartial boiler fairly of heating by direct boiler.
Iron and steel take the place of wood as the drapery of improvement of kier.
Improvement in the handling of the goods by the use of automatic pilling system.
Improvement of the circulation of kier liquor through the drapery by the use of sturdy pump.
Use of immoderate strain kier shorten the duration of boiling off and for this reason saves the worthy of the steam, strength and the like.
Working system of kier boiling:
Fig: Kier boiling process
Kier boiler is supplied two tubes. One is at the underside and an likelihood is biggest.
There is one manhole for loading and unloading of sample.
Preheater is likewise supplied at the midsection of these two tubes.
The liquor is arranged into the mixing tank by above chemicals then it brought into the preheater and heated by the steam.
The cloth is loaded in the mechanical instrument by man hole and saved in rope sort.
Then the hot liquor is pumped and sprayed by spader plate onto the cloth that's packed into the kier.
The temperature of the liquor is approximately one hundred oC and boiling for 8 hrs. the excess liquor passes slowly over the packed cloth and percolates through the false bottom of the kier.
Then this excess liquor is assemble at the underside of the kier and pumped into the auxiliary heater by a centrifugal pump and this cycle is repeat.
Below the false bottom the liquor is free from the oxygen of air.
After scouring, the cloth is washed with 80 oC water in a the numerous system impurities on the cloth does now not be removed.
Then the cloth is neutralizing with 0.1%-0.0.5 acetic acid. And then cold wash.
Precaution:
Kier must be clean.
Material must be packed gently.
No air pocket must be formed.
The cloth must be immersed in liquor completely.
After boiling the liquor must be removed in absence of water.
Before starting, all of the joining components must be checked.
The joint components must be leak proof.
Before scouring, the cloth must be starch free.
Advantages of kier boiling process:
Material scoured smartly.
Remove numerous the herbal coloration and an likelihood adventitious.
Disadvantages of kier boiling process:
Failure of strain gauge, boiler may perchance also smartly smartly be brust.
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