Method to obtain wood with weak fibre connections

Details Method to obtain wood with weak fibre connections Method to obtain wood with weak fibre connections

D - Textiles, Paper

21

B

D21B 1/02 (2006.01) B27L 11/08 (2006.01)

Patent

CA 2279355

The invention relates to a method and to an arrangement for obtaining wood in which the tracheids have less ability to bind to each other. The end surface of the wood is irradiated with pulsed laser light of such strength, and with such a number of pulses, that lignin-related cellulose and hemicellulose bonds break up along the light-conducting middle lamella to a depth which is sufficient to ensure that reduction of the wood (to paper pulp) via mechanical processes can be done more quickly, more gently and with greater energy efficiency.

L'invention concerne un procédé et un dispositif permettant d'obtenir du bois dans lequel les trachéides ont un faible pouvoir de liaison entre elles. La surface terminale du bois est exposée à l'action d'une lumière laser pulsé dont la puissance et le nombre d'impulsion sont tels que les liaisons de cellulose et d'hémicellulose, relatives à la lignine, se rompent le long de la lamelle centrale conductrice de lumière sur une profondeur qui est suffisante pour permettre de rendre la réduction du bois (en pâte à papier) par des processus mécaniques plus rapide moins agressive tout en améliorant le rendement énergétique.

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