CONTINUOUS DYEING MACHINE
Prepared by: Danish Raja
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.
Copyright © 2000 Harcourt, Inc. All rights reserved.
3-THERMOSOL PROCESS
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
Copyright © 2000 Harcourt, Inc. All rights reserved.
Any Question?