Pretreatment for better dyeing

Uneven dyeing and different color results from batch to batch is expensive and time consuming to correct. Use enzymes for desizing, bioscouring, and bleach clean-up to pretreat the fabric for excellent dyeing results.



Efficient processing of fabrics requires the right preparation, including the removal of the size coating after weaving. Desizing with enzymes ensures complete removal of starch-based sizes which means excellent batch-to-batch dyeing reproducibility and evenness. As additional benefits, enzymatic desizing reduces the need for chemicals and water and the milder processing conditions allow the fabric to retain its strength.

Save even more time by removing size (desizing) and pectin (bioscouring) in one combined step.

Novozymes’ product range for desizing gives you wide options, as it spans over a wide range of pH and temperatures - incl. very high and very low.


Bioscouring is enzymatic removal of pectin and other impurities from raw cotton and is a gentle preparation for the subsequent wet processing stages. Bioscouring replaces the conventional high temperature alkaline scouring and either eliminates or reduces the need for adding softeners.

The weight loss is lowered with 1-2% due to the elimination of cotton damage and the cotton retains its structure which means higher fabric strength for longer-lasting cottons.

Textile mills can create knits with a superior hand feel and lasting softness. Furthermore, enzymatic scouring will require less water, as fewer rinses are needed, and there are significant reductions in COD, BOD and salt (acid and alkali) in the wastewater. Bioscouring will primarily work on medium to dark shades and can be combined with desizing and biopolishing.

Bleach clean-up

Obtain a superior result with the best preparation. In order to get the same result every time, it is essential to have the same starting point. This is achieved by bleaching the fabric in advance, and equally important, by removing all residual hydrogen peroxide in a bleach clean-up process afterwards, as any trace of this auxiliary can interfere with fabric dyeing and leave the fabrics patchy and uneven in color. The removal can efficiently be done with enzymes, as they can break down the hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2).

Enzymatic bleach clean-up saves 1-3 baths of water and 20-30 minutes compared to conventional methods, such as using reducing agents or rinsing with vast amounts of water. This lowers the total cost of operation with savings in water, energy and time.

The bleach clean-up process can take place separately or together with biopolishing in the dye bath, making it ideal for the CombiPolish® process. Novozymes’ products are robust and work both at high pH and high temperatures.

Treat cotton as nature would

Clean water wanted

Novozymes' enzymes have proved to save 70,000 liters of water per ton of knitted fabric produced in a textile mill. With an annual production of approximately 9 million tons of knitwear globally, we would have an additional 630 billion liters of fresh water every year if all knitwear were produced using enzymes. That corresponds to the annual water consumption of about 10 million Europeans.

Enzymes, once they have done their job in the textile dye house or garment laundry, are broken down into harmless pieces of protein that do not harm the surrounding environment. That makes for clean waste water and cleaner, healthier rivers and streams.

Want to know how to pretreat for better dyeing?

Please fill in the contact form, and you will be contacted with details on our partner in your area. Novozymes’ only work with carefully selected distributors and formulation partners, who have been trained to sell and support our enzymes.