Cradle Type Multi-Stem Delimber

摘要

Multi-stem delimbing devices may rationalize processing of small-sized trees.Different types of delimbing device are reviewed. Some basic features of cradle delimbing were studied experimentally, for Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) separately. As standard for delimbing quality, the proportion of branches cut shorter than a specified value is proposed. Acceptable delimbing quality was defined in the study as 75 percent of the branches cut shorter than 25 mm. Efficiency was measured as the time required to achieve the defined delimbing quality. The design of the cradle itself, especially the inclination of the long-sides, was shown to be important in improving delimbing efficiency.