Paper Industry
Technical Association

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Equipment Description:Colourants To print this FactSheet click here To return to the FactSheet home page click here

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Market and distribute a wide range of organic and inorganic pigments on behalf of respected worldwide manufacturers

Equipment Description:
Colourants
Date Added: 29 September 2005
This Fact Sheet has been viewed: 4881 times.

What is it for?...   Many types of colourants are used in the paper industry. The main classes are: Basic Dyes Direct Dyes Cationic Direct Dyes Pigments (Organic colourants, not to be confused with white mineral pigments and fillers). Coloured paper is produced for many different reasons. Fashion and Appearance (bathroom shades, napkins, etc) Function (e.g. yellow, blue, pink copies in business forms) Visual Impression (e.g. brown packaging, Post-It notes, Financial Times, Yellow Pages etc) Violet and blue shades are also added to high white papers to improve "whiteness"

Related Terminology...   Each class of colourant has specific strengths and weaknesses. Basic Dyes Economic, high colour strength, very poor lightfastness Direct Dyes Moderate lightfastness, high substantivity, duller shades Cationic Direct Dyes Very high substantivity, slightly lower lightfastness than direct dyes Pigments Very high lightfastness, very high bleedfastness, no substantivity for fibres Clariant market a wide range of colourants with each class having a specific trade name. Cartazine, Carta, Cartasol F, Cartasol K, Cartasol M, Flexonyl, Cartaren The addition of colourants to paper is specific to the dye class being used, the desired colour, the type of paper being produced and the depth of shade required. Paper properties such as two-sidedness, bleedfastness, lightfastness, etc. must also be considered.

Diagram...   no image available at present

Technical Information..   Colourants are received in all container sizes from small drums to large 1 tonne semi bulk containers. Each colourant class has different precautions for handling and storing. For example, some basic dyes contain organic acids.

What else should I look at?... Colourants was also mentioned in the following Fact Sheets (1): Colourants ::

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