Practical Process of RMG Industry

Check List in Exhaust Dyeing for Reactive Dyestuffs

Check List in Exhaust Dyeing for Reactive Dyestuffs
Check List in Exhaust Dyeing for Reactive Dyestuffs

Check the hardness of water with Test-strips Hardness and the Bicarbonate with

Methyl-Orange + HCI Test


  • Check the Hardness from the salt with Test-strips Hardness and NaOH Test
  • Check the concentration of NaOH you will use to dye ( if different, make a conversion )
  • Check the recipe calculation for the dyestuffs and for the auxiliaries
  • Control the workman :
  • If you give to him g/l amount, He has to use a balance ( to measure a weight )
  • If you give him cc/l amount, He has to use a cylinder or pipette ( to measure a volume )

Check on the good :

  • the pH with pH test paper
  • the hardness with Hardness test-strips
  • the Peroxide residual with Peroxide test-strips ( if just bleached material )
  • If the total amount of hardness from the water, the salt and the material is more than 10°d,

Try to reduce it :

- For the water : Increase the Ladiquest 1097

- For the salt : Change salt to good quality

- For the material : Make a Acid scouring


If it is not possible, try to dyeing with the Only Soda ash method

• If the total amount of hardness from the water, the salt, the material is more than 10°d :

In according with the temperature method, add at the beginning, or by pre-metering

(ADCON pump) the necessary amount of NaOH to neutralize the Bicarbonate


• Control the workman while he is weighing the dyestuffs


• Check the machinery :
• The dependability of thermometer
• The power of circulation pump (in package or spool dyeing of yarn goods)
• The speed of engine (in rope dyeing for knit goods)


• Check the Liquor Ratio during the dyeing

Remember :

It. Total amount of water - (minus)

It. Water needed for the dyestuffs - (minus)

It. Water needed for the Alkali = (equal)

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It. Start amount of water in the dye-machinery




Engr. Kh. Mashiur Rahman Email: garmentspedia@gmail.com

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