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Moulder 52.38 3404.38 Pre-finishing 38.52 2503.76 7.2.1 CASE A AND B RESULTS FOR PLANT C As mentioned in the above section, Little’s Law was used to determine the Critical WIP for case A (vacuum with air drying) and case B (vacuum with no air drying). The Critical WIP is a total value; it does not specify the amount of WIP that corresponds to each process. To determine the WIP that corresponded to each process, for the simulations, a proportion was then gathered by dividing the WIP from each process from the VSMs by the total WIP. This proportion was multiplied to the simulation’s WIP0, and the value was used as the correspondent WIP for the different process at the production line. Simulations were run for a period of 13 weeks to represent the lead time obtained from the time line of each VSM. Every scenario (vacuum with air drying and no air drying) had 30 replications. According to Kelton et. al (2001), 30 replications is the minimum number to get statistic parameters (mean, confidence interval, and others). The obtained values for case A and B for Plant C with a 95% of confidence are summarized in Table 36. Table 36. Comparison of the Throughput, WIP, and Cycle Time for Case A and B for Plant C Variables VSM C Simulation Models Plant C Case A CI* Case B CI* Throughput (MBF) WIP (MBF) CT (days) 1057 1057 3811 1957.27 233 30 ± 1029.19 ± 1815.37 ± 28.64 1074.03 595.57 10.67 ± 1000 ± 556 ± 10.5 *CI: Confidence Interval 114PDF Image | Impact of Vacuum-Drying on Efficiency of Hardwood Products
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