Pretreatment of textiles in wet processing refers to subjecting the substrate (cotton fabric/yarn) to a chemical treatment that renders uniform absorbency and whiteness. Each and every fiber has to be treated in different ways to remove the unwanted contents from it and make it into suitable PFD/RFD (Prepared for Dyeing/Ready For Dyeing). Similarly the pretreatment can be possible in the fiber, yarn and fabric stage according to the requirement. Here we will consider including as many type of fibers as possible, so that the reader will be benefitted in full.
Cotton pretreatment is a wide subject - yarn and knit fabric would be straightaway scoured and bleached, woven fabric would have an additional process of desizing too. Grey and bleached mercerizing is an additional pretreatment that enhance the quality of cotton goods by providing lusture, strength and better absorbency....DETAIL
Viscose fibres, like cotton, have a high moisture regain. It dyes easily, it does not shrink when heated, and it is biodegradable. It is used in many apparel end-uses, often blended with other fibres, and in hygienic disposables where its high absorbency is of great advantage. In filament yarn form it is excellent material for linings. It is used very little in home furnishing fabrics but in the industrial field, because of its thermal stability, a high modulus version is still the main product used in Europe to reinforce high speed tyres.DETAIL
Acrylic fibres are soft, flexible and have a high loft. For this reason they are widely used in knitted apparel end-uses such as sweaters and socks. In addition to knitted apparel, home furnishing and blankets are other important applications due to its excellent heat retention.DETAIL
The world leader among synthetic man-made fibres.
Polyester was one of the great man-made fibre discoveries of the forties and has been manufactured on an industrial scale since 1947. Polyester fibres are the first choice for apparel and are used in trousers, skirts, dresses, suits, jackets, blouses and outdoor clothing.
Blends with cotton and virgin wool are very popular. They are often referred to as the "classical blend". This is normally a combination of 55% polyester and 45% wool.
Silk has wonderful properties of movement, flow and luxurious sheen which come from its smooth, continuous, triangular fibres which reflect light. It is also a very strong, elastic fibre which can stretch 20-25% without breaking and will stretch back; that is, it has a memory. Once woven, it can have a wide variety of appearances and feel from delicate, translucent chiffon gauze to robust, opaque, slubby fabrics such as douppion.DETAIL