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Desizing process


Desizing is the reverse process of sizing. It is necessary to remove the size paste from the fabric after weaving. It is nothing but the washing action that is able to remove possibly all the ingredients of size paste from warp ends.

Desizing process
Desizing process

Necessity of desizing

The varied characteristics of yarn are limited by size. 

Sizing has an impression on the subsequent properties:

  • Absorbency - the power of yarn to soak up is reduced as a result of size. As a result, yarn is going to be unable to soak up any chemical or colour during subsequent processing. further, as inconsistent dyeing, bleaching, printing, and other processes occur.
  • Stiffness- Because the stiffness of the yarn is enhanced as a result of size, the material is difficult to wear or use.

The size, which is added to the grey cloth in an exceedingly weaving preparatory procedure called sizing, contains inherent imperfections still as size is applied to the material to enable weaving Substances are added for specific goals, like greater weave-ability, increased strength, and so on, may well be classified as undesirable matter. As a result, for correct wet processing, this undesired size must be reduced through desizing. 

The desizing of the material is finished in two ways: hydrolytic and oxidative. Hydrolytic methods cause the starch to be hydrolyzed, while oxidative methods cause the starch to be oxidized during the desizing process. Enzymatic desizing, alkali desizing, acid desizing, and decay steeping are samples of the hydrolytic type, whereas chlorine, chlorite, and bromite are samples of the oxidative kind.

Sizing components accustomed to cotton warp thread to bolster it before weaving, like starch, carboxylic methylcellulose (CMC), polyvinyl alcohol (PVA), vegetable oils, tallow, and others, make

the material unsuitable for dyeing. Although warp sizing may be a vital procedure for the weaver, the dimensions within the grey cloth impede chemical reactions. As a result, to successfully wet the process, this undesired size must be reduced.

The object of Desizing 

 Desizing is the process of removing the dimensions that are given to grey fabric during the weaving process, allowing the material to be scoured and bleached properly.

Poly Alpha glucopyranose, which contains both straight-chain and branched-chain polymers, is the most prevalent constant size I.e starch chemically. 

Both of those polymer forms are water-insoluble, but they will be made soluble by hydrolyzing long-chain molecules into shorter ones. As a result, starch is often hydrolyzed or de-escalated over time under the proper conditions. 

The stages of hydrolysis are shown below.

[C6H12O5]n → [C6H12O5]  [C6H22O11] → C6H12O6 

Starch  Dextrin  Maltose  Glucose

(Higher molecular. (Low molecular weight ). Weight)

Desizing could be an action that may be controlled in terms of speed. as an example, if the desizing liquor is powerful, the method is completed quickly and desizing is often worn out never-ending manner; however, if relatively weak solutions are used, the method will take longer and desizing will be exhausted in batches.

Because the scale mixture usually contains other ingredients that the starch acts as a binder, the bulk of them are readily released and removed when the starch is hydrolyzed and washed off for efficient sizing operation, the added matter is chosen so 85 to 90% of the dimensions are removed during desizing so that desizing is completed uniformly.

Amylose and amylopectin are the 2 main components of starch. the share of amylose and amylopectin changes according to the source from which they were extracted. It's glucose that hasn't been polymerized.

Startch for desizing

Both amylose and amylopectin are water-insoluble and have an open chain versus an open-chain structure.

Strach ( C6H12O5 → Amylose.

 Amylopectin (Straight chain) → (Branched-chain)

Amylose for desizing
Amylose for resizing

Structure of amylose (linear, unbranded structure)

Structure of amulo pectin(branched structure)

Amylo pectin for desizing process
Amylo pectin for desizing process

Amylo pectin for desizing process
Amylo pectin for desizing process

Questions - 

  1. What is desizing?
  2. What is the necessity of desizing?
  3. What are the objectives of desiing?


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Babu, S. (n.d.). Textile Adviser. from

Desizing. (n.d.). Kemin. from

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Process of cotton Textile Materials desizing. (2013, September 12).; Fibre2Fashion.

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Further reading,

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