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Dec 16, 2010

Burn out printing on Blend PC (Polyester/Cotton ).

SUBJ-11:
Burn out printing on Blend PC (Polyester/Cotton ).



 Chemicals:
Synthetic Thickener, Sodium Bisulfate, Penetrating Agent, Glycerin and Water.

Purpose:
Burnout is a beautiful effect, Which is carried out on blend fabric and specially for those blends which have high percentage of cotton and are reserved dyed (mean polyester portion is either dyed or printed), when cotton burns down dyed polyester gives full shade and vacant spaces. One can literally see across this type of effect.
One can take simple white fabric, blend of course. Dye or print it with disperse dye in acidic medium than apply burn out recipe afterwards go for reduction cleaning which is required for polyester. This cleaning will also wash down burned cotton.
Cotton can be chemically burnt out at 200C in presence of Sodium bisulfate (other chemicals were also tested in order to substitute sodium bi sulfate , which is discussed in later portion)

As a big house Masood textile on its website expresses.

Preview this picture on large scale



Defining Burnout according to www.answer.com
Burn-out textiles is a technique used to develop raised designs on fabric surface.This is primarirly being done in fabrics with atleast 2 different fibre content i.e Cotton-Polyester , Silk-Rayon etc.Here one fibre component is being dissolved thru chemical reactions while the other content remains intact giving away raised illusion designs

Cotton Portion had blue where as polyester is having no color. So, during burn out cotton burns down leaving only polyester portion resultantly only white shade on burnt region and a wonderful pattern appears. Isnt it?


Recipe:
Stock paste:
Synthetic Thickener 8%          Balance
Sodium bisulfate(1:2)              300g/Kg
Glycerin                                 50g/Kg
Penetrating agent                    20g/Kg
Total                                       1 Kg

Note:
* (1:2) mean dissolve 150g of Sodium bisulfate into 150g of water and than added to remaining recipe. This is to have 100% soluble bisulfate.
* Thickener is never added instantly, Rather it is added into recipe at high stirring with slow sprinkle. It will form agglomerates if added in once. So never add at once rather sprinkle it into glass at high speed stirring.
* Synthetic thickener here can be of  poly saccharides based chemistry.



Process:
Print and dry at 110-120°C for 1Min.
Cure at 200C for 1 Min

Note:
* Curing time and temperature are needed to be pre tested (Lab Trial), Some time while using light blends, Polyester portion also get damaged. So, Consequently no good. One can choose one of these temperatures and times
  1. 160C @ 5Min
  2. 180C @ 2Min
  3. 200C @ 1Min

Options:
Chemicals other than Sodium Bisulfate were also tested for this experiment. e.g.
  1. Sulfuric acid                                        Full Black Effect (No Burning)
  2. Sodium Hydosulfite                             (No Burning)
  3. Sodium Bisulfite                                  (No Burning)

Burnout On Garment

Remarks:
Burnout is a great effect. It is adorable and seems pretty. Synthetic thickeners are usually polysaccharide based and normally used in disperse printing of Polyester Fabrics. This thickener is readily available in market. It is not something like special thickener which we used in our last post of  Indigo discharge. You can comment down for further query or for some correction!!

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