Theme: digital textile

Dyeing of textile products

Many textile products are dyed, such as loose fibers, yarns, fabrics, knitwear and even finished products. Two basic groups of dyeing methods can be distinguished: periodic and continuous, which also include semi-continuous methods.

Periodic methods consist in immersing a textile material in an aqueous solution of a dye for a specified period of time. Chemical auxiliaries are also added to the bath, which allows the dye molecules to migrate inside the fibers. After this process is completed, the bath is drained into the wastewater and the textile product is washed to remove chemicals.

The main element that distinguishes between continuous and periodic methods is the application of a dye by padding. In addition, in continuous methods, subsequent dyeing processes run continuously one after another, while in semi-continuous methods after padding, the process is interrupted and further stages are carried out as independent operations.

An example of a product that can act as a carrier in textile industry is Rokelan OPD. The product can be used as a carrier in the dyeing process of hydrophobic and polyester fibers, both pure and mixed. It ensures obtaining vivid colours regardless of their shade and intensity. Colourings using Rokelan OPD show good resistance to light. In addition, the use of this product guarantees high performance of the dye.