past year question
Question 2 A plastic injection molding plant will be built to produce 5,000,000 molded parts/yr. The plant will run 2 shifts per day, 8-hr per shit, five days/wk, and 52 wk/yr. For planning purposes, the average batch size is 10000 moldings, average changeover time between batches is 3hr, and average molding cycle time per part is 18 sec. Assume scrap rate is 3%, and availability for eaclı molding machine is 100%, whichi applies to both run time and changeover time. (a) How many molding machines are required in the new plant? (15 marks) [5 marks) (b) Determine the time required to produce each batch.