Woodyard Operations
The sole function of the wood yard is to receive pulp logs and process them by cleaning, sizing, and debarking. Further processing of pulp logs by chipping, screening and conveyance of the chips to storage piles or storage bins is common. The first step in the wood yard process is to take sorted logs and cut them to a uniform length or size. The correct length is a requirement for further processing in the debarking and chipping operations. Sizing requires that whole logs be conveyed to a cutting deck or slasher deck. Hydraulic grapples, overhead cranes, and/or conveyors deliver the logs to the deck whereby a series of saw blades cut the logs to a uniform length. It is not uncommon to wash the logs to remove surface dirt, grit and debris. Washing is done using warm water at high pressure (5 bar) 60 psi. Grit removal reduces equipment wear and facilitates subsequent handling of the logs. Water, abrasive soils, and acidic residues removed in washing of the logs increases the corrosion rate of structural steel supports and components of the deck. Prevention of structural degradation is an ongoing maintenance concern. Likewise, due to the volume of water used, proper lubrication of all rotating elements are critical. Bearings, gears, motors etc. should receive particular attention to guard against moisture contamination of lubricated parts.
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