Process for preparing base paper for fine paper

Details Process for preparing base paper for fine paper Process for preparing base paper for fine paper

D - Textiles, Paper

21

H

D21H 11/10 (2006.01) D21H 19/72 (2006.01) D21H 19/80 (2006.01) D21H 19/38 (2006.01) D21H 19/82 (2006.01) D21H 23/72 (2006.01)

Patent

CA 2247542

The present invention concerns a method for producing a base paper for fine papers, the base paper being produced from a mixture of a mechanical pulp and a chemical pulp. The chemical pulp used comprises a chemical softwood pulp having a elastic modulus close to that of the mechanical pulp and a great bonding strength. It is preferred to use a chemical softwood pulp which produces a sheet having a elastic modulus of less than 6000 N/mm2 when the bonding strength is 400 J/m2. A pulp of this kind has a goodScottBond strength at the same light scattering. The base paper produced by the method can therefore be used in double-coated fine papers which require a large bonding strength of the base paper.

Méthode de fabrication d'un papier support pour papier fin, qui consiste à mélanger une pâte mécanique à une pâte chimique. La pâte chimique utilisée comprend une pâte de bois résineux chimique ayant un module élastique assez semblable à celui de la pâte mécanique ainsi qu'une grande cohésion des fibres. Il est préférable d'utiliser une pâte de bois résineux chimique qui permet de produire une feuille ayant un module élastique inférieur à 6000 N/nm2 lorsque la cohésion des fibres est de 400 J/m2. Ce type de pâte démontre une bonne cohésion des fibres Scott au même niveau de diffusion de la lumière. Le papier support fabriqué selon cette méthode peut donc servir pour le papier fin double-face nécessitant une grande cohésion des fibres du papier support.

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