Cotfix RR series

COTFIX RR SERIES

‘Right first time’ dyeing with reactive dyes requires products having very similar application properties that are little affected by small changes in dyeing conditions. The Cotfix - RR combination is a trichromatic system engineered to meet all these requirements with high cost effectiveness.

An important requirement for a trichromatic combination is good reproducibility. Reliable reproducibility is required when recipes are transferred from laboratory to plant conditions, as well as from one batch to another. This is the case even if dyeing has to be performed on different machines and dyeing conditions cannot always be held constant. Moreover, a trichromatic combination should be able to satisfy a wide range of quality requirements. This results in a minimal number of different dyes needed in a dye house. To sum up, the main demands made on trichromatic dye combination are:

· reliable dyeing results

· good reproducibility of shade even if dyeing conditions vary

· good levelness

· good fastness properties

· flexible application possibilities

· high cost effectiveness

To meet all these quality requirements the best class of dyestuff we suggest for the dyers is “COTFIX RR series”.

The trichromatic combination Cotfix Yellow RR, Cotfix Red RR and Cotfix Blue RR may be safely used for all critical light and medium shades such as beige, grey, khaki, olive green etc.

Dyeing Procedure:

The trichromatic system can also be dyed using conventional dyeing procedures. Particular advantages are gained when using the automet dyeing process.

The specialty of Cotfix RR dyestuffs is its robust nature; small variations in temperature of dyeing, salt concentrations (up to 10%), alkali concentrations (up to 10%) and even dyeing time variations, would not affect the reproducibility of the shades.

Fastness properties:

With these dyes it is possible to obtain fastness properties that exceed the demands normally made on sports and leisure wear. Two features of the combination’s fastness properties are outlined below.

Light fastness

The three new dyes fade at essentially the same rate when exposed to light. The result is a lightening of the shade without a change in shade. On the other hand, should the blue dye in the trichromatic combination be replaced with a blue dye with higher light fastness such as C.I. Reactive Blue 220, the dyeing will exhibit an objectionable change of shade after exposure to light.

Stability to acids

The dyestuff-fiber bond formed by the new dyes is extremely stable to acids, so these dyes are ideal for dyeing polyester/cellulosic blends by the reverse dyeing process (pre-dyeing of the cellulosic component followed by acidified over dyeing of the polyester component).