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Description
This study analyzes and compares the productivity and economic efficiency of pull-through delimbers and processors in the processing of whole trees from partially mechanized timber harvesting in Baden-Württemberg, Germany. In forest-rich and topographically challenging regions such as the Black Forest, fully mechanized harvesting systems often reach operational limits. As a result, adapted semi-mechanized approaches are frequently applied, typically relying on the pre-concentration of timber. Within such systems, the pull-through delimber represents a practical alternative to processor-based processing. However, its performance and operational potential have so far received little systematic investigation.
The study combines qualitative and quantitative methods to evaluate operational workflows and machine performance. Expert interviews were conducted following the Grounded Theory approach to gain insights into practical applications, operational constraints, and decision-making processes. In addition, time studies were carried out to determine work productivity and cost parameters. These data were used to compare the pull-through delimber system with the processor-based processing system regarding productivity, cost efficiency, and operational suitability.
The results show that the processor-based system achieved higher and more consistent performance in terms of pure processing productivity. In contrast, the pull-through delimber system demonstrated considerable operational flexibility and adaptability. The pull-through delimber proved to be suitable for small to medium scale operations, under steep terrain conditions, structurally complex stands, and the production of treelength assortments. Furthermore, it was capable of handling larger stem diameters and could be deployed rapidly during salvage logging operations following disturbance events.
From an economic perspective, the analysis indicates that the pull-through delimber system can achieve competitive or even lower costs per cubic meter under favorable operating conditions. Cost advantages arise primarily from the machine’s high mobility, lower fixed cost risks during idle periods, and the potential to generate additional revenue from chipped biomass. Considering the established markets for treelength and wood-chip products in southern Germany, the results highlight a significant operational potential for pull-through delimber systems in semi-mechanized harvesting systems.
| Keywords | Delimbing; processing; productivity |
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