Welcome to Our PresentationTopic: Blended Dyeing

Introduction:

Blending of two or more different types of fibres is of crucial significance to the textile industry. The yarns and fabrics produced display a range of desirable properties that otherwise could not be achieved by a single textile component. The technical and commercial requirements of blended fibres place great demands on dyers and colorists to achieve high-quality, reproducible results under production conditions .Blends any textile materials, a from fibres through yarns to fabrics, which are deliberate combinations of chemically or physically different fibrous polymer

Types of Blends:

Fiber blends: Different fiber types blended into a single yarn.

Combination fiber blends: (a) Yarns of different fiber types woven, knitted, or bonded into fabric.

(b) Single yarns composed of blended fibres plied together.

Some Reasons for Blending of fibers:

To facilitate processing

To improve properties

To produce multi-colored fabrics

To reduce cost, to increase cost

Factors affecting the choice of dyeing methods:

* Colorist effect required (Union, reserve, tone-in-tone).* Colorfastness required of the resultant dyeing.* Suitability of the dyeing for subsequent finishing processes.* Compatibility of dyes from different application categories with one another.* Availability of particular types of batch, semi-continuous and continuous dyeing equipment.* Cost of the dyes and chemicals involved. * Economics of the overall process.

Important factors in dyeing blends:

* Dye selectivity * Dye bath conditions a. Dye auxiliaries b. Dye bath temperature c. Stress on fabric. *Dyestuff blockage a. Retarding agents b. Dye-molecule blockage*Determination of dyeing on various fibers: a. Leach outs b. Riders

Important considerations in dyeing blends:

Singeing – Natural fibers vs. Synthetics.

Desiring – Sizes normally used can differ.

Scouring – Effects of detergent and alkali.

Bleaching –Choice of bleach adverse effects of bleaching.

Mercerization – Castigation effects of sodium hydroxide.

Heat setting- Effects of high temperature dry or wet heat.

Materials and methods of blended dyeing:

Materials:100% Polyester yarnType: Spun yarnCount:202. Polyester Blended yarn|

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Mix : 65/35 P/C Mix : 50/50 P/CType : Spun Yarn Type: Spun Yarn

Count:2/20 Count: 2/20

Standardised recipe for Polyester and Cotton:

For Polyester: For Cotton:

•Disperse Dye-3% owf • Reactive Dyes-2%•Dispersing Agent-1g/l • Sequestering Agent-1g/l•Acetic Acid-1g/l •Leveling Agent-1g/l •Anti creasing Agent-1g/l •Salt-50g/l•PH-5.5 (Acidic condition) • Soda-15g/l

•Time-40-60min • Temperature-130°c M:L ratio-1:10 • PH-11.5( Alkaline Condition)

•Time-90min

Dyeing Procedure For Polyester:

The dye bath is set with 1g/l-Dispersing agent 0.5g/liter-wetting agent/leveling agent. The redox buffer is added and the PH is adjusted to 5.5. The redox buffer is added and the PH is adjusted to 5.5. The liquor is circulated through the package at 50°c for 15 min. The dyes are dispersed in 10 to 20 times in the weight of water at 45-50°c. The dispersion is filtered through a thin cloth into the dye bath. The liquor is circulated and the temperature raised to 130°c in 30 mins. Dyeing is continued for 40-60 min.

Dyeing Procedure For Cotton:

The dye bath is set up with required amount of dyes at relative temperature. After 10 min, required amount of salt is added. Raise the temperature to 60°c. Dyeing is carried out for 20 min.Then soda ash of required quantity is added continue the dyeing for 90 min and then after treatment is given.

Conclusion :

We have learnt by this assignment how to make Blended dyeing, its dyeing procedure, recipe, factors affecting the choice of dyeing methods etc. So, all the reasons, it is very important for every textile students and this knowledge will be help in our future job life.