Dyes and Chemicals Measuring Formula for Laboratory

Introduction:
Dyes and chemicals are measured in the lab. Lab Dip Development means the sample which is dyed according to buyer’s requirements (similar shade and so on). Depending on lab dip development sample dyeing and bulk production dyeing planning done.

The measuring formula for dyes and chemicals in textile processing will vary depending on the specific product being used and the desired results. However, there are some general principles that can be applied. The amount of dye or chemical needed will depend on several factors, including the weight of the fabric being dyed or processed, the type of fiber or yarn being used, and the desired color or finish.

Dyes and chemicals measuring formula will be discussed in the followings:

Dyes and Chemicals Measuring Formula for Laboratory

Preparation of Concentration of stock dye solⁿ –
Normally 0.1%, 0.5%, 1%, 1.5% and 2% stock solution of dyeing are prepared in beakers for daily used.

Preparation of Concentration of stock chemical solⁿ –
Similarly, 25% salt and 25% soda stock solutions are prepared in beakers for daily use.

The amount of dye solution (ml) is calculated as follow –

………………………………………………Fabric weight x Shade %
Amount of dye soln (ml) = ————————————————————
………………………………………The concentration of stock dye soln %

***Example:

In recipe, Fabric wt. = 5gm
Shade % = 2%

[If used 0. 5 % stock soln of dyes ] then,

………………………………………5 X 2
Amount of dye soln (ml) = ——— = 20ml .
………………………………………0. 5

The amount of chemical soln (ml) is measured as follow –

……………………………………………..,,,,,Fabric wt. * M : L * g/l
Amount of chemical soln (ml) = ———————————————
……………………………………………..1000 * Conc. of stock soln %

***Example:

In recipe, Fabric wt. = 5 gm
Salt = 20 g/l
M: L = 10

[ if taken 25 % stock soln of salt ] then,

………………………………………………………5 x 10 x 20
Amount of chemical soln (ml) = ———————————– = 4 ml
………………………………………………………1000 x 0.25

Recipe Calculation Formula: 

Required Dye = {Shade percentage (%) x Weight of the fabric in gram (gm)} / Percentage (%) of Stock solution. 

Or,

Required solution = Fw*Sp / Cs 

Where,

Fw = weight of the fabric, yarn
Sp = shade percentage
Cs = concentration of stock solution

Calculation of the dyeing recipe is done by the dyeing master. The whole work process is done in lap dip. Lab dip is a process by which buyers supplied swatch is matched with the percentage of the varying dye in the laboratory. Lab dip plays an important role in shade matching & and detaching the characteristics of the dyes and chemicals that are to be used in the large scale of production. So this is an important task before bulk production.

Author of this Article:
Rana Sohel
Executive Engineer
Sunman Textile Mills Ltd. Chittagong
Cell: +8801912-420118
Email: [email protected]

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