Delimbing quality and bucking accuracy of alder, pine and spruce logs harvested by Valmet 911.4
Journal Title: Annals of WULS, Forestry and Wood Technology; Zeszyty naukowe SGGW - Year 2016, Vol 95, Issue 1
Abstract
Increasing number of harvesters leads to their use in mixed and broadleaved stands. However, unfavourable shape of broadleaved trees (crowns with big branches and extended sweep in top parts of trees) is challenging for harvesters with heads dedicated for coniferous species. Therefore, bucking accuracy may vary in different species. The aim of the study was to determine the quality of alder logs in comparison with pine and spruce logs. The scope of the research included: quality of delimbing and the accuracy of bucking. The logs were cut from trees of different age and species: 84-year-old alder (alder I), 91-year-old alder (alder II), 80-year-old pine and 75-year-old spruce. Timber was harvested with six-wheeled Valmet 911.4 equipped with 360.2 harvester head. Logs measuring 2.40 m (hardwood) and 2.50 m (softwood) in length were cut from the middle and top sections of the stem. The height and the width of knots were measured (accuracy of 0.1 cm) to estimate the quality of delimbing. The accuracy of bucking was determined by length measurement with accuracy of 0.5 cm. In total, 64 logs were measured: 16 for each species/group (separately for alder I and alder II). The best quality of delimbing was obtained on the middle alder logs and middle spruce logs; lowest accuracy was on top alder logs. High accuracy of log bucking was achieved for all species, but slightly lower for alder wood. Valmet 911.4 with 360.2 harvester head can be used in stands with black alder with no negative consequences to delimbing, however with higher tolerance to bucking accuracy. Keywords:
Authors and Affiliations
AGNIESZKA ŁACKA, ANDRZEJ NOSKOWIAK, MARIUSZ BEMBENEK, MARTYNA ROSIŃSKA, PIOTR S. MEDERSKI, ZBIGNIEW KARASZEWSKI
Keywords
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