Doctoral thesis, this is intended to reduce the amount of waste in the production process of blow molding plastic bottles. A case study of a company, University, education, Industries Ltd. five step all the production and design of the notes of the disadvantages (Sheer Cheek), to store the data of damage that occurs in which the data will be analyzed to find the cause of the damage with Why – Why then find the correct approach Chart with How.– How the control Chart and the planned route (Control Plan) along with improving the size of jig used in producing plastic bottles from the original 23 mm, 25 mm rise, is from studies of waste in the manufacturing process, before adjustments are reduced from the original 8.35%, 11.52% and accounted for the loss cost equals 72684 6057 baht/month or baht/year reduction from the original 19980 1665 baht/month or baht/year.
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