Process for improving and retaining pulp properties

Details Process for improving and retaining pulp properties Process for improving and retaining pulp properties

D - Textiles, Paper

21

D

92/34

D21D 1/00 (2006.01) D21C 9/00 (2006.01)

Patent

CA 1170487

ABSTRACT OF THE DISCLOSURE A process is provided for treating pulp fibres, that have already been curled in order to improve at least some of the following physical properties: drainage, wet-web stretch, wet-web work-to-rupture, and dry-sheet tear strength and stretch, which process comprises: subjectinng said curled pulp fibres to a heat treatment while said pulp is at a high consistency in the form of nodules or entangled mass, without appreciable drying of the pulp, the heat treatment being at an elevated temperature and for a time sufficient to render the curl permanent to subsequent mechanical action. The process comprises: subjecting the curled pulp to a heat treatment e.g. at a temperature of at least 100°C, preferably 100°C-170°C, for a sufficient length of time, e.g. between 60 minutes and 2 minute, inversely dependent on the temperature, while the curled pulp is at a high consistency, e.g. at least 15% pre- ferable 15% to 35%, in the form of nodules or entangled mass. The heat treatment is sufficient to render the curl permanent to sub- sequent mechanical action. This permanent curl has advantages for papermachine runnability and for increasing the toughness of the finished product.

402701

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