Cold pad-batch fixation

Cold pad-batch (CPB) is a continuous dyeing process for cellulosic fibres such as cotton, linen, viscose and lyocell using reactive dyes. The fabric is impregnated with dye liquor and alkali, squeezed off, batched onto a roll and rotated slowly at room temperature for several hours. Dye-fibre bonding takes place without added heat, driven purely by the alkaline reaction.

The benefits versus thermal exhaust dyeing are substantial: roughly 50 % less water, up to 90 % less process steam and lower salt consumption. Colour yield is high, wet fastness excellent, and the treatment is particularly gentle on delicate cotton-elastane fabrics. Drawbacks are long dwell times (up to 24 h) and a limited shade range.

• Up to 50 % water and 90 % energy savings vs exhaust dyeing
• Very good wet and rub fastness
• Ideal for cellulosic fibres
• Requires long dwell time on the batch roll