METHOD FOR PULP PREPARATION AND PULP TREATMENT AND A PAPER, ESPECIALLY A TISSUE PAPER

摘要

The invention relates to pulp treatment by pulp fractionation such that the pulp is fractionated into a short fiber fraction and a long fiber fraction, wherein the short fiber fraction bypasses the refiner and the long fiber fraction is mechanically treated in the refiner, whereafter the untreated short fiber fraction and the mechanically treated long fiber fraction are mixed together or are used separately for paper production. By this fiber fractionation before refining fiber lengths distribution is optimized in order to maximize the strengths properties and to minimize the fines content. According to this mode the long fiber fraction will have a mechanical treatment which is more effective.