Category Archives: Knit Dyeing

Bleaching And Scouring Process Of Grey Melange Fabric

Pre-treatment is done for grey melange fabric. I have written about scouring and bleaching process of grey melange yarn in one of my blog post.

Whitening Recipe: Here, I have given a scouring and bleaching process of grey melange with a whitening recipe. I think this will help you to get better pre-treatment result.

Ingredient

Amount

detergent

0.5 g/l

Sequestering agent

1.0 g/l

Anti-creasing

0.8 g/l

Stabilizer

0.8 g/l

Caustic soda

3 g/l

Per oxide

3 g/l

Brightening agent

0.1 g/l

Sequence of scouring and bleaching: Grey melange fabric is pre-treated as the following way.

 

Fabric received from the batching section

Water load

Fabric load

Run 5’ at normal temperature

Drain

Water load

Sequestering, anti-creasing and stabilizer are added at normal temperature

Run 5 minute

Caustic dosing10’ at 40 0C

Steam rise to 700C

Peroxide (600C x10’ dosing)

Temperature 950C

Run time 40’ at 950C

Whitening agent dosing 20’

Run 10’

Sample check

Fabric Unload

So, that’s all about scouring and bleaching process of grey melange fabric.

Process Flow Chart Of Viscose Fabric Dyeing

In dyeing floor, different types of natural, regenerated, synthetic, blended fabrics are dyed. All of the fibers dyeing procedure are not same. For this reason, an textile engineer should have vast knowledge about the different fibers dyeing process.


Viscose fabric or synthetic fabric dyeing procedure is given bellow:

Viscose fabric received from the batching section

Required amount of water was taken into the machine

The fabric was loaded and run for 5-10 minutes in normal temperature

Drain

Required amount of water filled

CK-1,Oxalic acid were added/dosing at hot water for 15 min at 950 C in adding tank

Rinsing for 20 min.

PH check at 5.5

Leveling agent dosing 10 min. at 550C

Run for 20 min

Salt was added for 10 min

Run for 10 min

Color was dosing for 30 min at 500C

Run for 20 min

Soda was added for 40 min at 500C

Run for 10 min

Temperature increase at 600C

Run for 1 hrs

Shade check (OK)

Rinsing for 30 min.

Acetic acid was added for neutralization for 10 min

Run for 15 min. at 40 0C

Shade check (ok)

Rinsing for 10 mins

Drain

Water was filled at required amount

Hot wash at 950C for 10 min.

Drain

Water was filled at required amount

Cold wash for 20 min.

Drain

Acetic acid added for PH controlled

PH check at 5.5

Softener added at 500C

Run for 30 min

Unloading the dyed fabric

Dyeing performance depends on the proper procedure and qualified dyes and chemicals.

Dyeing Procedure Of Polyester Fabric | Disperse Dyeing Process

Polyester fabric dyeing is done by the disperse dyes. Disperse dyes are water insoluble; for this reason dispersing agent is used for make it soluble in the water. We can see the polyester yarn dyeing process for getting more information.

Dyeing Procedure of Polyester Fabric: Here, I have given a dyeing sequence for polyester fabric.

Polyester fabric received from batching section

Required amount of water filled

Fabric was loaded and run for 10 min.

Drain

Required amount of water filled

CK-2 and oxalic acid was added for 5 min.

Run for 20 min. at 800 C

Rinse for 15 min.

Drain

Required amount of water filled

Formic acid added for PH– controlled

Check PH at 4.5

Leveling agent (DIF) added for 10 min.

Temperature increase at 600 C

Color/Dyes added for 15 min.

Run for 10 min.

Temperature increase at 1300 C for 30 min.

Run for 30 min.

Cooling at 800 C

Shade check

Rinsing for 15 min.

Drain

Required amount of water filled

Hot wash at 800 C

Shade check

Rinsing for 15 min.

Unloading

Disperse dye is suitable for polyester dyeing. It has great dye pick up %. Fastness properties of of the disperse dye is good to excellent.