Synchronization of Log Cutting and Sawn Timber Drying Technologies

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Abstract

The research is devoted to the synchronization of log cutting and sawn timber drying processes. It has been shown that, given the actual number of sawn timber sections produced by large-scale sawmilling during the technological period, the buffer storage units of drying stacks of boards do not ensure the uninterrupted operation of the tunnels. There is either an overflow of buffer storage units with stacks, or their absence when free space occurs in the tunnels. The methods used for calculating the buffer storage units of the stacks do not take into account the probabilistic nature of the characteristics of sawmills and drying shops. They do not provide a mathematical description of the relationships between the rate of incoming raw sawn timber stacks, the capacity of the buffer storage unit, as well as the number and capacity of drying tunnels. The aim of this work has been to find the patterns of accumulation of sawn timber stacks in front of drying tunnels and loading tunnels with stacks, with the establishment of the average waiting time for stacks in the storage unit under different characteristics of log sawing and sawn timber drying processes. The “stack storage unit – drying tunnels” system has been presented as a multi-channel queuing system with parallel operation of channels and waiting. The main initial indicators of the system are the rate of incoming raw sawn timber stacks to the storage unit in front of the drying tunnels and the intensity of sawn timber drying in 1 tunnel. The main output operational characteristics are the probability of a full tunnel load, the average number of stacks in the storage unit, and the time the stack remains in the storage unit. The general patterns of accumulation of board stacks and filling of drying tunnels in the conditions of largescale production of sawn timber have been established. The examples of solving practical problems of synchronizing sawmilling and sawn timber drying have been presented. It has been shown that the obtained graphs and mathematical models make it possible to solve production problems: to analyze the influence of the type and size of the sawn raw material, the structure of the sawing patterns, the feed rates of the sawmill equipment, the operating modes of the sawmill, as well as the drying modes of the sawn timber on the choice of the number of tunnels and their capacity.

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