Continuous dyeing machine
Download as PPT, PDF1 like1,339 views
This document discusses continuous dyeing machines. It begins by explaining that continuous dyeing is most suitable for woven fabrics, where the textiles are fed continuously through a dye range consisting of dye application, fixation with heat or chemicals, and washing. There are three main types of continuous dyeing machines: pad-steam, pad-dry, and thermosol. The pad-steam process involves padding, steaming, and additional treatments before washing. The pad-dry process involves padding with dye and alkali, then drying and washing. The thermosol process dyes at high temperatures like 180-220°C in an enclosed vessel. Major manufacturers of continuous dyeing machines include Benninger and Shanghai Singularity machines.
Continuous dyeing machine
- 2. CONTINUOUS DYEING MACHINE Prepared by: Danish Raja Danish_raja1@hotmail.com Mehran university of engineering and technology (m.u.e.t) jamshoro
- 3. Contents: • What is dyeing? • What is continuous dyeing process? • Types of continuous dyeing machine? • Manufacturers of continuous dyeing machine? • Conclusion.
- 4. 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.
- 5. 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.
- 6. TYPES OF CONTINUOUS DYEING MACHINE There are mainly three types: 1-Pad-steam process 2-Pad-dry process 3-Thermosol process
- 7. 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.
- 8. 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 ̊C for 30 sec. Then fabric is washed in open width washer.
- 9. 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.
- 11. 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.
- 12. 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.
- 13. Copyright © 2000 Harcourt, Inc. All rights reserved. 3-THERMOSOL PROCESS
- 14. MANUFACTURERS: • Followings are the manufacturers of the continuous dyeing machine. Benninger; Shanghai Singularity machines; China manufacrurers;and Etc
- 15. 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.
- 17. Copyright © 2000 Harcourt, Inc. All rights reserved.
- 18. Any Question?