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A value stream map was created for both case studies to graphically draw one part of their line production. Then, simulation was used to model the VSM of each company with the objective to see how vacuum drying can affect cycle time, throughput and WIP. The obtained results demonstrated that vacuum drying has the potential to achieve shorter drying times, drying smaller loads, and achieving at least the same drying quality as conventional drying, while servicing the market more efficiently. All these potential benefits, can help sustain a more effective hardwood supply chain in the U.S. 8.2 CONCLUSIONS The conclusions of the project can be listed according to the three objectives proposed. 9.2.1 To estimate conventional and vacuum drying times, quality, and costs for drying 4/4 red oak lumber 1. According to the information from Company A and B and from literature, vacuum drying results in less check, end splits, drying stress and total shrinkage than conventional drying. 2. According to the information from company A and B and literature, vacuum drying times with air drying were 67% less than conventional; and vacuum with no air drying times were 70% less than conventional drying. 3. For the production lines studied, vacuum drying with air drying resulted in the highest drying cost, $349/MBF and $373/MBF respectively for both Plants C and D. The higher cost was due mainly to the capital investment of the dry kilns and inventory, which represented 8.26% and 83%, and 7% and 97% of the total costs of vacuum with air drying of Plant C and D respectively. 124PDF Image | Impact of Vacuum-Drying on Efficiency of Hardwood Products
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