Mechanical Pulp

Mechanical pulp, generated by the conventional groundwood process or modern refining technology, that is TMP or CTMP and APMP processes, is bleached with hydrogen peroxide to very high brightness levels. Yield and fiber properties are kept on a very high level. The conventional approach is the application of H₂O₂ together with caustic soda as alkali source, sodium silicate for stabilization and buffering, and a chelant for the sequestering of metal traces in the wood pulp.

Hydrogen peroxide gives

• high brightness and high brightness stability against aging and yellowing
• moderate effluent load and good biodegradability

Evonik's Applied Technology Center offers technical assistance to customers for the evaluation and the optimization of existing processes. Information and assistance in setting up storage tanks and dosing units is available from our Engineering Services. Internationally presented papers on mechanical pulp bleaching are available on a wide number of important technical topics.