Debarking drum, method and system for debarking of wood

A system for the debarking of wood, which system comprises a debarking drum apparatus, which includes an essentially horizontal cylindrical drum which is supported to revolve around its longitudinal axis, wherein the drum comprises:

• a first end for the feeding of wood into the drum;
• a second end for the removing of wood from the drum, wherein an inner surface extends between the first end and the second end;
• debarking iron sections extending inwardly from and fixed to the inner surface, the debarking sections extending in the longitudinal direction of the drum on an interior circumference of the drum, wherein the debarking iron sections are spaced in the circumferential direction to define gaps therebetween, the debarking iron sections positioned to lift input wood upwards on the circumference of the drum when the drum is revolving and to release the bark of the wood;
• bark openings which extend through the drum from the inner surface to an exterior of the drum, the bark openings allowing the passage of bark which comes off from the wood, out of the drum;
• rigid structure for the breaking of the bark of the wood for the debarking of the wood, which structure comprises studs for the breaking of the bark of the wood for the debarking of the wood, which studs are positioned either:
• fixed on the inner surface of the drum between said debarking iron sections, and the studs are at the first end of the drum on a partial length of a total length of the drum between the first end and the second end;
• or
• on rotating elements that precede the drum.

A method for the debarking of wood using a debarking drum apparatus having an essentially horizontal cylindrical drum, which is supported to revolve around a longitudinal axis, the method comprising:

• feeding wood into the drum from a first end while the drum is rotated;
• lifting the wood which has been fed into the drum upwards by engaging debarking iron sections fixed to an interior of the drum with said wood in order to debark the wood as the wood drops on the wood in the drum, the debarking iron sections being spaced circumferentially to define gaps therebetween;
• removing bark released from the wood through bark openings in the drum;
• and
• removing debarked wood from the rotating drum from a second end of the drum which is downstream of the first end;
• and
• breaking the bark of the wood fed into the drum by engaging a plurality of inwardly protruding rigid studs fixed to the interior of the drum and positioned to facilitate debarking, wherein the studs are fixed in the drum in the gaps between the debarking iron sections at the first end of the drum or are positioned ahead of the first end of the drum as part of a separate structure rotating for the breaking of bark, the separate structure being positioned ahead of the first end of the drum and feeding into the drum.