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How to Calculate 0.5% Dyeing Shade in Fabric

Working Procedure to Calculate 0.5% Shade in Fabric
Rana Sohel
Executive Engineer
Sunman Textile Mills Ltd. Chittagong
Cell: +8801912-420118
Email: rsohel07tex@gmail.com



Preparation:
  • To prepare 0.1% Stock solution, it is necessary to mix 0.1 g dye and 100 cc water.
  • To prepare 0.5% Stock solution, 0.5 g dye stuff is mixed with 100 cc water.
  • To prepare 1.0% & 2.0% Stock solution similar procedure is followed.
  • To prepare 10% Stock solution of Soda ash, 10 g Soda is mixed with 100 cc water. 
Dyeing lab
Dyeing lab
Calculation:
Usually following calculations are followed -

                              Recipe % X Sample Weight
** Dye Solution = …………………………….. (cc).
                                   Stock solution %

                Recipe % X Liquor)
** Salt = …………………………….. (gram per liter, gpl).
                         1000

                                Recipe % X 100 X Liquor
** Soda Solution = ……………………….............. (cc).
                                1000 X Stock solution %

Sample Calculation for 0.5% Shade

Sample wt. = 5 mg
Material liquor ratio = 1: 10
Total liquor (5 X 10) = 50 cc

                                        5 X 0.5%
Dye solution required = ­­­­­­­­­­------------------- = 2.5 cc
                                            1 %

                                       50 X 25
Salt solution required = ­­­­­­­­­­------------------- = 6.25 cc
                                       20 X 10

                                                50 X 10
Soda ash solution required = ­­­­­­­­­­------------------- = 2.5 cc
                                               20 X 10

Water required = {50 - (2.5 + 6.25 + 2.5)} = 38.75 cc

Working Procedure
All ingredients had been taken according to the recipe into the pot of sample dyeing machine. At a room temp the material had run then after 10 minutes started to rise the temperature at 1°C/ min. to get 60°C temperature. For performing the required dyeing temperature it took 30 minutes. The material had dyed at 60°C for 45 minutes. Then the temperature was reduced at room temperature within in 10 minutes. The fabric washed in cold water & then the material was washed in 1 gm/l soap solution (liquor ratio 1:20) at 90°C temperature for 15 minutes. Then after rapidly cold washing the material was dried & preserved.

And then check the shade match with the required sample by the lighting box.

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