Title:
LOG CONDITIONING BEFORE MECHANICAL DEBARKING LOG CONDITIONING BEFORE MECHANICAL DEBARKING
Document Type and Number:
WIPO Patent Application WO1996018481
Kind Code:
A3
Abstract:
High powered lasers are used to score the bark on logs before they are mechanically debarked. Typical of the lasers employed are multi-kilowatt CO2 industrial lasers. A high powered laser beam is brought to a focus just above the surface of the bark on the log. A jet of compressed air is blown coaxially 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 extending across the base of a trough. 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,
Inventors:
THOMA EDUARD JOSEF
Application Number:
PCT/US1995/016970
Publication Date:
December 05, 1996
Filing Date:
December 12, 1995
Export Citation:
Assignee:
BELOIT TECHNOLOGIES INC (US)
International Classes:
B23K26/08; B23K26/40; B27L1/00; B27M1/06; (IPC1-7): B27L1/00; B23K26/00; B27M1/06
Domestic Patent References:
| WO1992013686A1 | 1992-08-20 |
Foreign References:
| DE9402681U1 | 1994-04-21 | |||
| US4180109A | 1979-12-25 | |||
| DE4304887A1 | 1994-09-01 | |||
| US5274211A | 1993-12-28 | |||
| FR2300662A1 | 1976-09-10 | |||
| EP0316256A2 | 1989-05-17 | |||
| AU649619B2 | 1994-06-02 | |||
| FR2305936A1 | 1976-10-29 | |||
| US3991800A | 1976-11-16 | |||
| US2881814A | 1959-04-14 |
Other References:
DATABASE WPI Section PQ Week 8924, Derwent World Patents Index; Class P63, AN 89-176788, XP002005216
DATABASE WPI Section PQ Week 8012, Derwent World Patents Index; Class P63, AN 80-C6781C, XP002005217
DATABASE WPI Section PQ Week 8012, Derwent World Patents Index; Class P63, AN 80-C6781C, XP002005217
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