Flow Chart of Polyester/Cotton Blended Fabric Dyeing

Polyester/Cotton Blended Fabric Dyeing: 

In the case of polyester/cotton blended fabric, double dyeing is done. For this reason, this dyeing process is called the double part dyeing process. In this dyeing process; the polyester part is dyed first then the cotton part is dyed. Flow Chart of Polyester/Cotton Blended Fabric Dyeing is as follows.

Blended Dyeing

Sequence of dyeing Polyester/Cotton fabric:

Select bleach fabric (5gm)

Carbonizing of cotton part

Fabric weight measure with carbonized part

Recipe making

Select dyes

Dyeing of polyester part

Matching dyed PES part with standard
(If Yes)

Dyeing of cotton part

Hot wash

Neutralization

Soaping

Cold wash

Drying

Total sample match with standard sample
(If yes)

Bulk production

Blending cotton/polyester fibers is common practice in the textile industry. In comparison with 100% cotton, cotton/ polyester blends have higher breaking and abrasion strength, crease-resistance, are more comfortable to wear and display better easy-care properties. However, the P/C blends possess some challenges to dyer as polyester shows a hydrophobic character while cotton shows a hydrophilic character making it inevitable to dye them with chemically different classes of dyes.

Commercially polyester/cotton blended fabrics are dyed by two-bath or one-bath two-step dyeing method employing suitable dyes and chemicals for each fiber. Two bath dyeing methods are relatively long and complicated. The one-bath two-step dyeing procedure is shorter as compared to the two-bath method, but the drawbacks are lower dyeability and poor reproducibility. Many research works have been carried out to dye polyester/cotton blends in one-bath dyeing method using conventional dispersed dyes and newly developed reactive dyes which can be dyed at acidic or neutral conditions around 100– 130°C and are added simultaneously to the same bath.

Generally, this process is done to get the light and a medium shade of P/C blended fabric in a shorter possible time than any other process as like a two-bath process. The present work involves one-bath one-step dyeing and two bath process of P/C blend fabric using the same amount of dyes and comparison is done between two methods.

Author of this Article
Rana Sohel 
Executive Engineer 
Sunman Textile Mills Ltd. Chittagong 
Cell: +8801912-420118 
Email: rsohel07tex@gmail.com

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