Operational efficiencies and costs of an arm roll forwarder: A case study at Nasu in Tochigi Prefecture, Japan

Abstract

We investigated a developed arm roll forwarder at Nasu in Tochigi Prefecture, Japan. An arm roll forwarder can only load a steel container that has been fully loaded with logs beforehand, and can later unload such a container. Such a forwarder can shorten the loading and unloading times and improve operational efficiency. We examined two operation systems with an arm roll forwarder and a forwarder. In the first system the loading was done with a grapple-loader. In the second system the loading was done with a processor. The loading times of an arm roll forwarder were significantly less than those of a forwarder. Because the optimal cycle times (excluding the waiting times for an arm roll forwarder) were significantly reduced, the costs of using an arm roll forwarder are lower, although the loading capacity was small and the hourly operation cost was high. The maximum operational efficiencies varied depending on forwarding distances. The second operation system with an arm roll forwarder exhibited the best operational efficiency within a 1,580-m forwarding distance, and beyond that distance it exhibited the highest operational efficiency when a forwarder was used. Similarly, the cost of operation of the system with an arm roll forwarder was the lowest within a 1,130-m forwarding distance, and beyond that distance the cost was the lowest when using the forwarder. Therefore, the arm roll forwarder is effective within a certain forwarding distance.

Keywords

arm roll forwarder / steel container / operational efficiency / cost / forwarding distance

References

[1] Nakahata C, Aruga K, Takei Y, Yamaguchi R, Ito K, Murakami A, Saito M, Tasaka T, Kanetsuki K. Improvement on operational efficiencies and costs of extracting thinned woods using a processor and a forwarder in Nasunogahara area (II) based on comparative analyses of current operations and mechanized operations. Bulletin of Utsunomiya University Forest, 2011, 47: 27-34.

[2] Yamasaki T, Tokuhisa K, Miyata H. Technical support for establishing the low cost logging system. Bulletin of Kochi Prefectural Forestry Technology Research Center, 2011, 36: 40-67.

[3] Goto J, Takeda A. On the operation system to make the efficient use of the movable type forwarder. Journal of the Forestry Mechanization Society, 2009, 668: 9-15.

[4] Takahashi T. Introducing a removal type forwarder machine: An efficient log production system with the use of a removable type forwarder machine. Journal of the Forestry Mechanization Society, 2008, 657: 23-27.