Use of ultrafast intense laser for processing...

Details Use of ultrafast intense laser for processing... Use of ultrafast intense laser for processing...

B - Operations, Transporting

27

M

B27M 1/00 (2006.01) B23K 26/00 (2006.01) B23K 26/06 (2006.01)

Patent

CA 2332820

A method of processing lignocellulosic material comprises the steps of (a) generating a pulsed laser beam consisting of a train of laser pulses, each laser pulse having a duration less than 1 x 10-9 sec. and a peak intensity of at least 1 x 1011 w/cm2; and (b) directing the laser beam generated in step (a) onto a surface of the lignocellulosic material to cause ionization and fragmentation of macro-molecules thereof. The method of the invention enables one to cut, carve and/or sand the surface of lignocellulosic material without, burning same or damaging the cells of the lignocellulosic material.

L'invention porte sur un procédé de traitement d'une substance ligno-cellulosique, procédé qui consiste à: (a) générer un faisceau laser pulsé constitué d'un train d'impulsions laser, chaque impulsion ayant une durée inférieure à 1 x 10?-9¿ s et une intensité en crête d'au moins 1 x 10?11¿ w/cm?2¿; et (b) diriger le faisceau laser généré à l'étape (a) sur une surface de la substance ligno-cellulosique de façon à provoquer l'ionisation et la fragmentation de ses macromolécules. Ce procédé permet de découper, sculpter et/ou poncer la surface de la substance cellulosique sans brûler ou endommager ses cellules.

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