Abstract: In a method and conveyor for conveying a solid material by means of parallel, oblong transfer elements that move back and forth in the direction of transfer, most of the surface of the transfer elements moves in the direction of transfer at the same time and at least part of the surface thereof is inclined towards the center of the conveyor. Pieces of material lying on inclined outermost transfer elements are carried on a lower longitudinal part of the transfer elements, the angle of inclination of the part about the longitudinal axis being smaller than the angle of inclination of the upper part thereof. Thus, the support force exerted by the transfer elements on the pieces lying thereon, and the friction force between them and the pieces lying thereon, increase.

Abstract: The present invention concerns a method and an apparatus for defrosting frozen wood prior to debarking. The defrosting method of logs of the invention is based on bringing heat zone-specifically to logs in transfer motion on a conveyor according to their heat receiving capacity immediately from the moment of starting of the defrosting, and at the end of the defrosting process, the heat volume per time unit, supplied at a higher temperature, is only a part of the heat volume of the starting phase of the defrosting process. For instance, it is possible to spray water on the wood to be defrosted so that the row interval of the showers in the initial part of the piping is a fraction of the row Interval in the tail end of the piping. In the tall end of the defrosting conveyor steam can also be supplied.

Abstract: A wood chipping method and a disc chipper provided with knives (4). The chips (11), after having separated from a log (3), pass through a chip opening (12) in the disc (1) and hit an impact surface (10) located after a knife. Along different portions of the knife (4), a stronger impact effect is caused in proximity to the centre than in proximity to the outer periphery of the disc. The direction of the impact surface (10) deviates more from the direction of the rear surface (15) of the knife in proximity to the centre of the disc than in proximity to the outer periphery of the disc. The distance of the connecting line between the rear surface (15) of the knife and the impact surface (10) from the cutting edge (16) of the knife can be longer on the outer periphery of the disc than in the centre of the disc.