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Direct Dyeing: Lab No. 01

This lab manual outlines the procedure for direct dyeing of fabric and includes the following steps: 1) Preparing a dye solution by dissolving 6g of dye in 300ml of water containing 18g of sodium chloride. 2) Loading the dye solution into a pad-thermosol dyeing machine and passing a bleached fabric sample through at 150C for 2 minutes to dye it. 3) Passing the dyed fabric through a 200ml soda ash solution at 158C in the pad machine to fix the dye. 4) Finally, passing the fabric through a 200ml softener solution in the pad machine and drying it at 120C for 2 minutes.

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341 views2 pages

Direct Dyeing: Lab No. 01

This lab manual outlines the procedure for direct dyeing of fabric and includes the following steps: 1) Preparing a dye solution by dissolving 6g of dye in 300ml of water containing 18g of sodium chloride. 2) Loading the dye solution into a pad-thermosol dyeing machine and passing a bleached fabric sample through at 150C for 2 minutes to dye it. 3) Passing the dyed fabric through a 200ml soda ash solution at 158C in the pad machine to fix the dye. 4) Finally, passing the fabric through a 200ml softener solution in the pad machine and drying it at 120C for 2 minutes.

Uploaded by

Shahan Akhtar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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TT-5063 Adv.

Textile processing technologies Lab Manual

Lab No. 01

Direct dyeing
Objective: In this lab, I will learn about the procedure and solution of direct dyeing and softener.

Introduction:
Direct Dye is a class of dyestuffs that applied directly to the substrate in a neutral or alkaline bath. They
produce full shades on cotton and linen without mordanting and can also be applied to rayon, silk, and
wool. Direct dyes give bright shades but exhibit poor wash fastness.

Experimental Procedure:
1. Take fresh water = 300ml in a beaker.

2. Take sodium chloride (Nacl) = 18g/300ml (std. 60g/l)

Sodium chloride dissolved in fresh water (300ml).

Color Shade 2%

3. Take dye with respect to liquor ratio (mean water 300ml).

Dye = 6g (shade 2% and water 300ml =.02*300= 6)

6g dye is dissolved in sodium chloride mix water.

4. Load these dye mixers to Pad-thermosol dyeing machine (TC-M-31).


5. A bleached piece of fabric passed through the roller of Pad-thermosol dyeing machine (TC-M-31)
at temperature 150C, fabric piece taken 2 minutes for completion of work. Now the fabric is
diyed.

For dye fixation:

6. Take fresh water another beaker = 200ml

7. Take Soda ash = 4g/200ml and dissolved in water. (std. 20g/l)

Add dyed fabric into soda ash solution.

8. Now, passed this fabric through pad machine roller for dye fixation at 158C.

For softener:

Take fresh water = 200ml

9. Take softener = 10g/200ml and dissolved in water (std. 50g/l)

Dissolved the dyed fabric into softener water.

10. At last, passed this fabric through pad machine for drying at 120C for 2 mins.

Observations:
Fabric hand feel is smooth and good

Color shade is ok.

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