BATCH DYEING PROCESS

Batch Dyeing Process is the most popular and common method used for dyeing of textile materials. Batch dyeing is also sometimes referred to as Exhaust dyeing. This is because in this process, the dye gets slowly transferred from a comparatively large volume dyebath to the substrate or material that is to be dyed. The time taken is also longer. The dye is meant to 'exhaust' from dyebath to the substrate. In batch processes, textile substrates can be easily dyed at any stage of their assembly into the desired textile product. This includes fiber, yarn, fabric or garment. Some type of batch dyeing machines can function at temperatures only up to 1000oC. For example cotton, rayon, nylon, wool etc. can be dyed at 1000oC or lower temperatures. While polyester and some other synthetic fibers are dyed at 1000 Centigrade or even higher temperatures. There are three general types of batch dyeing machines. The first type is the one where there is circulation of fabric. Second type is the one where the dyebath gets circulated while the material that is being dyed remains stationary, and finally the third type where both the bath and material to be dyed gets circulated. Examples of dyeing machines that utilizes batch dyeing process are Beck, Jet, Jigs, Beam Package dyeing machines etc.