The Influence of Pulp on the Colour of Dyed Papers
Research and development
Author:
- Drzewińska Ewa
Institute of Papermaking and Printing, Technical University of Lodz, Łódź, Poland
 Full text | Abstract: The dyeability of bleached chemical pulps, bleached chemithermomechanical pulp and deinked pulp with anionic and cationic direct dyes was investigated. It was found that direct dyes may be used for mechanical and recycled pulps to reduce the cost of the paper manufacturing process by the application of cheaper semi-finished fibrous products. However, the colours attained differ from the colour of dyed chemical pulp. To obtain the required colour, we needed larger amounts of dye, but in this way the savings obtained by using cheaper pulp grades may be wasted. |
Tags: bleached cellulose pulp, bleached chemithermomechanical pulp, deinked pulp, colour, direct dyes.