A method of producing mechanical and chemi-mechanical pulp

Details A method of producing mechanical and chemi-mechanical pulp A method of producing mechanical and chemi-mechanical pulp

D - Textiles, Paper

21

B

D21B 1/02 (2006.01) D21B 1/12 (2006.01) D21B 1/14 (2006.01)

Patent

CA 2151364

A method of producing mechanical and chemi-mechanical pulp with a yield above 85 % from lignocellulose-containing material for the manufacture of paper or board products. The material is subjected to mechanical processing in at least two steps. The material at its feed into the first step has temperature below the softening temperature of lignin. When the material is fed into at least one subsequent processing step, it shall have a temperature above the softening temperature of lignin.

L'invention concerne un procédé pour produire une pâte mécanique et semi-chimique avec un rendement supérieur à 85 %, à partir d'un matériau contenant de la lignocellulose, pour la fabrication de produits du type papier et carton. Le produit est soumis à un traitement mécanique au moins en deux étapes. Le produit à l'alimentation dans la première étape a une température au-dessous de la température de ramollissement de la lignine. Lorsqu'on transfère le matériau vers au moins une étape subséquente de traitement, il a une température supérieure à la température de ramollissement de la lignine.

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