Why Enzymes:-


1)       It is bio-degradable. Hence eco-friendly


But Enzyme is very sensitive to following factor:-


     i.   PH

     ii.  Heavy metal ion

     iii. Temp.


List of Enzyme used in Pretreatment process for cotton woven fabric:-


For Example:


1)    Amylases: which converts amylase and amyl pectin polymer commonly referred to as starch into water soluble shorter chain. dfdsfsf

2)    Pectinases: Which hydrolysis pectin consisting of linear polymers of galacturonic acid (Bio-scouring Caustic)

3)    Catalyses or peroxidasis: which catalyse the decomposition of peroxide also known as peroxide killer.

4)    Cellulases: which catalysis the hydrolysis of cellulosic material (Bio-singing or Bio-polishing).

5)    Bacterial enzyme: used in desizing for woven fabric.


Case study:-

Material:-Camaflouge

Quality: 100% cotton fabric.

Count:-2/40 (warp) 20(Weft)

Quantity: 2400 metre /290 kg (Approx).

Shade:-Khakhi (Military dress)

Place: Sri Lanka

Water hardness:-70 ppm




Process sequence: desize-wash-mercerize-wash-scouring-wash-cold wash-peroxides bleach- peroxides neutralizing-hot wash-cold wash-neutralizing-drying and batching-pad-silicate(Dyeing) soaper wash-drying and batching for printing.


M/C used: Padding m/c, soaper machine and jumbo jigger machine.


        i.      Desize:-Bacterial enzyme (Imported):-3 gram per liter.

Common salt=10 gram liter.

Non-ionic wetting agent=0.5 gram per liter.

(Ph maintained with acetic acid 5.5, temperature=60-65 degree Celsius)

Padding and batching for 4 hour- soaper wash.

Total time for desizing:-8 hour 40 minute


       ii.      Scouring:-Caustic soda = 60 gpl

Crypto-anionic wetting agent = 0.5 gpl

Fellosan jet=0.05 gpl

Padding and batching for 90 minute (with closed steaming chamber)---jigger wash.

Total time=6 hours


     iii.       Bleaching, neturalising and stenter drying:-

Total time:-8.40 hour


      iv.      Pad silicate and soaper wash (Dyeing process)

Batching time=16 hour.

Total time=21.30 hour


Total time =i+ ii + iii+ iv: 8.40+6+8.40+21.30 hours =46 hour 30 minute.


 

Ecofriendly process:-


Process sequence:-desize-washscouring and bleachinghot washperoxides neutralizing-cold washneutralizingdrying and batchingpad-silicatesoaper washdrying and batching for printing.

M/C used:-Padding m/c, soaper machine and jumbo jigger machine.


  1.  Desize: Bacterial enzyme (Imported):-3 gram per liter.

Common salt=10 gram liter.

Non-ionic wetting agent=0.5 gram per liter.

(Ph maintained with acetic acid 5.5, temperature=60-65 degree Celsius)

Padding and batching for 4 hour- soaper wash.

Total time for desizing:-8 hour 40 minute


  1.  Scouring and bleaching:

Bio-scouring (Pectinases type imported item)=6% owf

Hydrogen peroxide=6% owf

Contawan GAL (stabilizer) =2% owf.

Fellosan jet(lubricating agent)=0.1% owf

Process in jigger= 2 turn cold---10 turn at 85oCelsius----hot wash---peroxide killer---hot washcold washdryingpad silicate(dyeing)soaper wash.


Perioxide Killer: (enzyme based):-0.5 gpl.


  1. Pad silicate (dyeing)soaper wash.


Total time: i +ii+ iii =35 hour 30 minutes


Total time saving=11 hours.


Result:


After enzyme based pretreatment process 20% Dye addition was given as compared to normal process. Since it was bulk order and process has to select in normal process in maximum padding batching system. This process time saving was there hence this process followed.


Conclusion:


First trail should be taken in lab then go for bulk trail. This article has been written in good faith for problem solving altitude / suggestion purpose.


About the Author:


The author is the Product Manager (Reactive) in Colourtex Ind Ltd, Surat.



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