Log conditioning before mechanical debarking

B - Operations – Transporting – 27 – L

Patent

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Details

B27L 1/00 (2006.01) B23K 26/00 (2006.01) B23K 26/08 (2006.01) B23K 26/40 (2006.01) B27M 1/06 (2006.01)

Patent

CA 2207702

High powered lasers are used to score the bark (28) on logs (26) before they are mechanically debarked. Typical of the lasers employed are multi-kilowatt CO2 industrial lasers. A high powered laser beam (20) is brought to a focus just above the surface of the bark (28) on the log (26). A jet of compressed air is blown co-axially with the beam and facilitates the beam's formation of a narrow slot in the surface of the bark. Logs are advanced and rotated by a plurality of parallel augers (42) extending across the base of a trough (40). The lasers are positioned in a gap beneath and in between sets of augers. The beam's focus may be adjustable with respect to the bark's surface. The motion of the log with respect to a laser head produces a spiral cut along the surface of the log which slices the long fibers in the bark.

Des lasers à grande puissance sont utilisés pour réaliser un trait de coupe sur l'écorce (28) des billes de bois (26) avant leur écorçage mécanique. On emploie généralement des lasers industriels à CO¿2? de plusieurs kilowatts. Un faisceau de laser à grande puissance (20) est amené sur un point de concentration situé juste au-dessus de la surface de l'écorce (28) de la bille de bois (26). Un jet d'air comprimé est insufflé dans le même axe que le faisceau pour faciliter la formation par celui-ci d'une encoche étroite à la surface de l'écorce. L'avancement et la rotation des billes sont assurés par une pluralité de tarières parallèles (42) qui s'étendent au-dessus de la base d'une auge (40). Les lasers sont placés dans un espace qui se trouve au-dessous des séries de tarières et entre elles. Le point de concentration du faisceau est réglable par rapport à la surface de l'écorce. Le mouvement de la bille par rapport à une tête de laser permet d'obtenir à la surface de la bille une coupure en spirale qui tranche les fibres longues de l'écorce.

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