The document discusses the process of enzyme washing of garments. It describes that enzymes are biochemical substances that act as catalysts for specific reactions and can selectively attack substrates. The objectives of enzyme washing are to remove size and starch from garments to make them softer and improve colorfastness. It then outlines the steps of the enzyme washing process which include a desizing step, enzyme wash step using acid or neutral enzymes, a softening step, hydroextractor to remove water, drying, and quality checking before delivery. The enzyme wash helps achieve a smooth surface finish on cellulose fabrics and allows for higher machine loading.

1. On
Enzyme Wash

2. Submitted by:-
Md.Ibrahim Khalil
ID:16173207095
Intake:19,Section:02
Department of Textile Engineering
Bangladesh University of Business & Technology

3. Enzymes are bio chemical substances that behave as
catalysts toward specific reactions. What makes very
interesting the enzymes under a chemical point of view is
their high specificity or in other words, their ability to
attack selectively a given substrate.

4. Objects of Enzyme wash
 To remove the size materials from the garments.
 To remove the starch presents on the garments
fabrics.
 For soft feeling to wear the garment.
 To achieve the buyer reference sample.
 To increase the color fastness & rubbing fastness.
 Especially develop the "Bio-Polishing" affect of
cotton/denim.
 Enzyme improves the anti-pilling properties.
 Enzyme attacks more the surface of the fabrics and
gives a very smooth surface.

5.  Simple process handling and minimum effluent problem.
 Better feel to touch and increased gloss or luster.
 Can be applied on cellulose and its blend.
 It allows more loading of the garment into machines.
 Environmental friendly treatment.
 Less damage to seam edges and badges.
 Use of softener can be avoided or minimized.

6. Acid Enzyme:
 Acid enzyme colour is slightly brown.
 pH range is 4.5 to 5.5
 Temperature -40°c -55°c.
 Time required 25 mts to 50 mts.
 Enzyme affects come within short time.
 Staining/Bleeding occurs more in garments.
 Production high.

7. Neutral Enzyme:
 Enzyme is slightly white powder form.
 pH range is 6 to 7.
 Temperature -40°c -60°c.
 Time required 40 to 70 mts.
 Enzyme affects come slowly.
 Less staining/bleeding on garments.
 With pumic stone comes good affect/abrasion on
garments.
 In dark shade enzyme affect comes good.

8. SL Enzyme:
 SL enzyme is liquid form.
 pH range is 6 to 7.
 Temperature range 40°c -60°c.
 Time required 45 to 80 mts.
 Enzyme affects come slowly.
 Less staining/bleeding on garments.
 With pumic stone come better affect.
 In dark shade enzyme affect comes good.

9. # First Step: Desizing
 Lot Size ............ 60 kg
 M : L = 1 : 9 .............. 540 Litre
 Run The Machine.
 Desizing agent @ 0.6gm / litre ............ 324 gm.
 Detergent @ 0.8gm / litre.................... 432 gm.
 Temperature.......................... 60°c.
 Time...............................10--20 min.
 Drop the liquor.
 Wash 1 time by cold water.

10. # Second Step: Enzyme Wash
 M:L = 1 : 8 .............. 450 Litre
 Acetic Acid @ 0.6gm / litre ................270 gm.
 Anti back staining @ 0.6gm / litre........ 270 gm.
 Acid Enzyme @ 2.00gm / litre ................ 900 gm.
 Temperature.......................... 45°c
 Time .......... (Depend upon the shade )...40--60 min.
 Increase temperature to 90°c and run 1 minute
(enzyme killing).
 Drop The Liquor.
 Rinse Twice, each 3 minutes.

11. # Third Step: Softening
 M:L = 1 : 8 ..................... 450 Litre.
 Acetic Acid @ 0.6gm / litre ............ 270 gm.
 Cationic Softener @ 1gm / litre.............. 450 gm.
 Temperature........................ Room Temp.
 Time ............................................. 15 to 20 min.
 Drop The Liquor.
 Then unload the garments.

12. # Fourth Step: Hydroextractor Machine
After unloading garments from the washing
machine then they are sent to hydroextractor
machine to remove excess water from the washed
garments.

13. # Fifth Step: Drying Machine
 Load 60 kg garments to gas dryer.
 Temperature set -75°c to 85°c.
 Run about 40 min.
 After then run 10 min in cold dryer.

14. # Sixth Step: Delivery
After dryer, garment goes to quality section for quality
checking and good one delivery.