Ab Karlstads Mekaniska Werkstad

Aktiebolaget Karkstads Mekaniska Werkstad

Sten-Ake Gustafsson

Kurt A Banner

In order to enable a satisfactory degree of barking when removing the limbs and bark from wood in a barking drum having internally a plurality of log lifters and a plurality of slots arranged around and along the drum for the discharging of waste material freed, said drum comprising two axially aligned drum halves each comprising a main treatment section with a transition section located between them, said transition section is provided with a separating section comprising an arresting surface for the waste material and an annular outlet opening cooperating with the arresting surface and arranged in the dividing plane between the two drum halves, for discharging limbs and bark caught by the arresting surface.

Barking drum and method

In order to effect removal of both limbs and bark from wood, such as trimmings or trees removed in thinning, with satisfactory results in a barking drum, the drum proper comprises a cylindrical pretreatment section of large diameter, a tapering transition section and a cylindrical final treatment section of smaller diameter. In the pretreatment section, which has a larger number of log lifters, an intensive treatment of the bundle takes place, so that the stems of the trees are exposed while branches and twigs are crushed. In the transition section, which has only half the number of log lifters, the tumbling motion of the wood subsides and a change-over takes place to parallel barking, which is concluded in the final treatment section, where the number of log lifters is again increased, suitably up to the original number. The pretreatment section is preferably preceded by an infeed section with infeed means arranged on the inside for quick feeding-in of the bundle of trees into the pretreatment section. The infeed means can consist of helically extending pusher vanes.

Growing community of inventors

Edsvalla, Sweden

Sten-Ake Gustafsson