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Hydrolytic desizing

Hydrolytic desizing

 Classification of Desizing methods - The desizing process of the fabric can be classified into three main categories while, as per the chemicals and methods they are subcategories. 

Desizing methods

A) Hydrolytic methods

B) Oxidation methods

C) Novel methods

A) Rot steep

A) Chlorine

A) Solvent

B) Acid steep

B) Chlorite

B) Desizing 2000

C) Enzymatic 

D) Alkali desizing

C) Bromite

C) Low-temperature plasma treatment

Hydrolytic desizing has 4 types as mentioned in the above table. Here first two types are discussed.

Rot steeping

Padding solution -  Water 
Process flow 
Padding(water)  Squeezing → Store fabric(24 hr)  Hot wash → Cold wash.
Storages time - 24 hours

Economical process
No chemical is used


Time-consuming and Danger of mildew attack.

Rot steeping
Rot steeping

Acid desizing

Padding solution- 0.5% mineral acid

Process flow- 

Padding(H2SO4→  Squeezing → Store fabric (1 hr) → Hot wash → Cold wash

Storages time- 60 min

Faster and more economical process.
Not requires specific conditions.

Risk of damage due to mineral acid.
If acid wet fabric allows drying then the formation of hydro cellulose will be there which weakens the fabric.

Acid desizing process
Acid desizing process

Alkali Desizing

Padding solution- 2-3%solution of an alkali like NaOH

Process flow- 

Padding(NaOH) → Squeezing → Store fabric(4-5 hr) → Hot wash → Cold wash.

Storages time- 4 to 5 hours

Scouring is done simultaneously so, separate scouring is not required.


Risk of damage due to Alkali solution.
Expensive process due to the use of chemicals.

Enzyme Desizing

Enzymes are members of the 'PROTEINS' class of natural chemical substances.
Chemically, these enzymes are merely higher-molecular-weight proteins. 

A 3D complex polypeptide protein makes up the enzyme. Amylases were the first and, to this day, the most successful enzymes for desizing in the textile industry, allowing for easier starch removal. 

Amylases are a type of enzyme employed in industrial processes, accounting for approximately a quarter of the enzyme market.

The enzyme is a three-dimensional protein structure that functions as a catalyst or activator in biological activities including digestion and growth.

Enzyme molecules are made up of a lengthy chain of amino acids, some of which are arranged in a helix structure and others that are not.

Classification of enzymes-

Enzyme Desizing is classified based on the source from which they are obtained as follows-
There are two types of enzymes, one type is derived from animal sources and the other is from vegetable sources.

The vegetable source can be further classified into malt extract and bacterial enzymes. 

Questions -

  1. What is the hydrolytic desizing process?
  2. Which are the types of hydrolytic methods?
  3. What are the advantage and disadvantages of the rot steep method for desizing?
  4. What are the advantage and disadvantages of an acid steep method for desizing?
  5. What is enzyme desizing and how its work?


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Further reading,

Writer - Rushikesh Patil (Textile Engineer)
(DKTE Society textile engineering college Ichalkaranji)
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