A study on reduction of waste resulting from products as black dots on the plastic parts of the factories which has lose and affect customers and the quality of industrial products. The problem with black spots, it is a problem that urgently requires action fever, production products quality meets customers ' satisfaction, which is your most discerning Fri chutima and Suwannee sin Chai research subjects to reduce the waste resulting from products as black dots on the plastic parts have released guidelines of six. Sigma (Six Sigma) Statistical knowledge and tools to the advanced quality system management is applied to analyze the cause and remedy the problem. Steps to resolve the problem in accordance with guidelines for six sigma (Six Sigma) is comprised of 5 steps. (1) steps to identify the cause of the problem, (2) measurement procedure to determine the cause of the problem (3) analytical procedure to determine the cause of the problem. (4) the process of revision processes (5) step 5 production process control process called "DMAIC" results from the experiment concluded that the factors that affect the occurrence of black point: a good Runner, not the screw did not pass to Ron to clean. Fix from (1) clean the screw (2) Adjust the temperature to 200 degrees for injection (3) Cleaning and contamination of plastic granules, mixed with a Runner to Runner Ron prior to use.
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