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Figure 12 shows how vacuum drying impacted the line production. Kiln drying inventory was reduced from 8.25 MMBF to 292.40 MBF, a 96% reduction. Rip Saw inventory was reduced from 400 MBF to 8.9 MBF, a 98% reduction. Inventories in knot machine and flooring were non- existent in the simulation. Also, inventories for shipment where reduced completely because the company is meeting daily demand. As shown in Figure 11 and 12, the total lead time from purchased lumber to customer delivery is 9 and 19 days for Plant C and D, respectively. The obtained production lead times are less than in conventional drying (288 for Plant C and 141 for Plant D). The conventional drying rate for Plant C and D was of 54 days, which dropped to 8 days with vacuum drying. Inventory lead time for the drying operation for Plant C and D was 160 days and 86 days, which decreased to 20 hours and 5 days. These results can enhance the importance of vacuum drying in the improvement of hardwood manufacturing by: 1) reducing inventory by 97% on average, 2) meeting desired throughput and 3) reducing cycle times by 85%. 7.4 INVENTORY COST FOR PLANT C AND D To further investigate the impact of using vacuum drying versus conventional drying, an estimation of the inventory cost for both case studies was done. The methodology used was proposed by Keown et. al (2006). Table 38 indicates the WIP values obtained from the VSMs and the simulation model for an approximate period of 4 months for the drying operation. These WIP values were used to determine the cost of inventory. 119PDF Image | Impact of Vacuum-Drying on Efficiency of Hardwood Products
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