Dyeing process of Lycra Single Jersey Fabric

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Single Jersey Spandex (Lycra) Fabric

Dear All, 

Today I will share with you a very important dyeing process. Some times we got query from buyer for Fabric with spandex. All of these the most common require fabrication is - 95% cotton 5% spandex, Single jersey  , 160 GSM. From the fiber market we can got many kinds spandex for knitting the fabric. Denier is the unit of Spandex. The common denier is 20D, 40D & 70D. Fiber thickness of 20D is thin then 40D. And 70D is thicker then 40D. Lycra is a brand (name) of Spandex.  

In single jersey spandex fabric it is very difficult to keep the GSM lower. If you intending to produce the s/j cotton spandex fabric in between 155 to 165 GSM then please follow the below things:

Fabric 95% cotton 5% spandex, Single Jersey, 160 GSM

Yarn count should be - 40/s comb

Spandex should be - 20D

Stitch Line should be - 2.80

Dyeing Process of Single Jersey Cotton Spandex Fabric:

• 1st step: After receive the grey fabric from knitting section in tube form, in dyeing section, at first we slit the fabric by slitting machine. 

• 2nd Step: Then we heat set the slitted fabric by stenter machine for avoiding the creased mark. And also for the Dia & Grey GSM fixing.

          Dyeing the fabric (in the winch)-

• Option A) If the dyeing factory has high pressure dyeing machine (winch) then we should dye the fabric in open width. 

• Option B) If the dyeing factory has normal dyeing winch then we should back sewing the open fabric to make it tube again.

• 3rd Step: Scouring (detergent wash) the fabric in the dyeing winch and released the water for perform the next process. 

• 4th Step: Labeling the fabric by labeling agent which increased the PH of fabric.

• 5th Step: Soda / Salt wash.

• 6th Step: Mixing the specific color (reagent) for dye the fabric. Or if fabric color is white then we used brightener chemical in this step. And step 06 is not require for white color fabric.

• 7th Step: Acid wash (after released color mixing water) 

• 8th Step: Color fixing by fixer. 

          Finishing process of the fabric (After dyeing) -

          If we are following option (A) then step will be like as below

• 9th Step: Stentering (heat setting) for adjust the Dia. For this again stentering we called it double heat settings. 

• 10th Step: Open compacting for control shrinkage of fabric length.   

            

          If we are following option (B) then step will be like as below

• 9th Step: Slitting 

• 10th Step: Stentering (heat settings) for dia adjust.

• 11th Step: Open compacting for control shrinkage of fabric length. 

Now the fabric is ready for cutting. Please test the Shrinkage, Color shade, Gsm before start cutting.

Hope, it will be helpful for all of you

Thanks & best regards

Bipul