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Pretreatment:: Desizing, Scouring Bleaching

The document discusses textile pretreatment processes which involve cleaning operations to remove natural and added impurities from fibers in order to make dyeing and printing easier. Pretreatment includes desizing, scouring, and bleaching of cotton, wool, silk, and synthetic fibers. The objective is to make the fibers hydrophilic and remove dirt to achieve whiteness. Specific steps are outlined for pretreatment of different fiber types like singeing, degumming, carbonizing, fulling, and heat setting. Uneven pretreatment can deteriorate qualities like uneven dyeing and decreased colorfastness.

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389 views2 pages

Pretreatment:: Desizing, Scouring Bleaching

The document discusses textile pretreatment processes which involve cleaning operations to remove natural and added impurities from fibers in order to make dyeing and printing easier. Pretreatment includes desizing, scouring, and bleaching of cotton, wool, silk, and synthetic fibers. The objective is to make the fibers hydrophilic and remove dirt to achieve whiteness. Specific steps are outlined for pretreatment of different fiber types like singeing, degumming, carbonizing, fulling, and heat setting. Uneven pretreatment can deteriorate qualities like uneven dyeing and decreased colorfastness.

Uploaded by

victoria
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Pretreatment:

Natural fibers and synthetic fibers contain primary impurities that are contained
naturally, and secondary impurities that are added during spinning, knitting and weaving
processes. Textile pretreatment is the series of cleaning operations. All impurities which
causes adverse effect during dyeing and printing is removed in pretreatment process.
Pretreatment processes include desizing, scouring, and bleaching which make
subsequent dyeing and softening processes easy. Uneven desizing, scouring, and
bleaching in the pretreatment processes might cause drastic deterioration in the
qualities of processsed products, such as uneven dyeing and decrease in fastness.

Objective of Pretreatment:
 To Convert fabric from hydrophobic to hydrophilic state.
 To remove dust, dirt etc from the fabric.
 To achieve the degree of desire whiteness.

Steps in Pretreatment Process of Cotton and Natural


Fibers:
Major steps involved in textile pretreatment are,

1. Singeing
2. Desizing,
3. Scouring,
4. Mercerization
5. Bleaching.

Steps in Pretreatments for Wool:


1. Raw wool scouring; aqueous and/ or solvent washing
2. Carbonizing
3. Scouring (desizing)
4. Fulling /crabbing/thermo fixing
5. Easy-care treatments
6. Anti-felting anti-shrinking treatments
7. Wool Bleaching

Steps in Pretreatment of Silk:


To prepare a silk yarn for dyeing and silk fabrics for dyeing and printing, it is necessary
to partially or completely remove sericin, as well as natural oils and organic impurities.
Depending on the percentage of sericin removed during scouring (sericin is present in
raw silk in a ratio between 20 % to 25 %), the end-product is defined as unscoured
(used only for shirts and suits), `souple' or degummed.

1. Degumming
2. Scouring
3. Bleaching

Pretreatment Of Synthetic Textile Materials:


Although mots of the synthetics do not need to be given a very strong pretreatment
however the possible steps in pretreatment of synthetics are 

1. Desizing
2. Heat setting
3. Washing
4. Bleaching if necessary.

Read more: http://textilelearner.blogspot.com/2011/03/pretreatment-of-textile-dyeing-
printing_322.html#ixzz4Ps7n5w53

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