continuous dyeing machine

CONTINUOUS DYEING MACHINE

Prepared by: Danish Raja

[email protected]

Mehran university of engineering and technology (m.u.e.t) jamshoro

Contents:

• What is dyeing?

• What is continuous dyeing process?

• Types of continuous dyeing machine?

• Manufacturers of continuous dyeing machine?

• Conclusion.

What is dyeing• Dyeing is the process of imparting

colors to a textile material.• Dyeing can be done at any stage of the

manufacturing of textile- fiber, yarn, fabric or a finished textile product including garments and apparels.

• The property of color fastness depends upon two factors- selection of proper dye according to the textile material to be dyed and selection of the method for dyeing the fiber, yarn or fabric.

Continuous dyeing process

• Continuous dyeing has been found to be most suitable for woven fabrics.

• The textile substrates are feeded continuously into a dye range.

• A Continuous dyeing process typically consists of dye application, dye fixation with heat or chemicals and finally washing.

TYPES OF CONTINUOUS DYEING MACHINE

There are mainly three types:

1-Pad-steam process

2-Pad-dry process

3-Thermosol process

1-PAD STEAM PROCESS

• This technique is mainly used for dyeing. It is particularly suitable for the application of direct, vat, sulphur and reactive dyestuffs.

• It includes the following steps: Impregnation by padding Steaming (at about 100 °C) Additional impregnation of the fabric with developing

agents (e.g. reducing agents in vat or sulphur dyeing) Washing and rinsing.

1-PAD STEAM PROCESS

• In this process, the fabric is padded with the dye solution with 60-800C.

• Then fabric is passed through drying chamber.

• After chamber the fabric is padded with chemical (NaOH+Salt).

• Then the fabric is passed through a chamber at 102 9C for 30 sec. Then fabric is washed in open width washer.

2-PAD DRY PROCESS

Steps: • Fabric is first padded in a padder with reactive dye in

presence of an alkali.• 2-Padded fabric is then passed through a squeezing

roller into a dryer. As a dryer cylinder, stenter etc may be used. During drying due to higher temperature fixation of dye in fibre increases and at the same time water is removed by evaporation.

• 3-After drying fabric is washed in a washing machine to remove unfixed dye.

2-PAD DRY PROCESS

3-THERMOSOL PROCESS

• Thermosol method is continuous method of dyeing with disperse dye.

• Here dyeing is performed at high temperature like 180-220°C in a close vessel.

• Here time of dyeing should be maintained very carefully to get required shade and to retain required fabric strength.

3-THERMOSOL PROCESS

1- At first the fabric is padded with dye solution using recipe in a three bowl padding mangle.

2- Then the fabric is dried at 100°C temperature in dryer.

3- For dyeing, infra red drying method is an ideal method by which water is evaporated from fabric in vapor form. This eliminates the migration of dye particles.

4-Then the fabric is passed through thermasol unit where thermo fixing is done at about 220°C temprature for 60-90 seconds depending on type of fibre, dye and depth of shade.

5- In thermasol process about 75-90% dye is fixed on fabric.After thermo fixing the unfixed dyes are washed off along with thickener and other chemicals by warm water.

6- Then soap wash or reduction cleaning is done if required.

MANUFACTURERS:

• Followings are the manufacturers of the continuous dyeing machine.

Benninger;Shanghai Singularity machines;China manufacrurers;andEtc

CONCLUSION

• The continuous dyeing machine can easily dye any textile matirial with a high speed.

• Its speed can vary between 50 to 250 meters per minute.

• According to Industry estimates Continuous dyeing is a popular dyeing method and 60% textile matirials are dyed.

REFERENCE

• http://textilesite.blogspot.com/2012/03/dyeing-process.html

• http://www.fibre2fashion.com/industry-article/14/1332/some-of-the-process-sequ

ence-with-dyeing

Any Question?

continuous dyeing machine

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