Nobnikan Wongsapsakul
ABSTRACT
This research aims to study the factors affecting the mixing efficiency of the case study company and to improve the non-oil EPDM mixing process by applying the Six Sigma concept. Five systematic steps are conducted to apply the Six Sigma approach, i.e., define, measure, analyze, improve and control. After applying the DMAIC steps, wastes occurred in the process are substantially reduced by shifting the Mooney viscosity mean to be near or on the target value as reflected from increased process capability index (Cpk) from -1.25 to 3.92. In addition, the result of the response surface method reveals the appropriate process parameter setting as follows: mixing time~14 (min.), Nip gap~1.10 (mm.) and Number of passes~9 (pass.). The result also shows that the standard deviation is decreased from 0.45 to 0.30.
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Cross Ref
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Index Terms
- Improvement of Non-oil Ethylene Propylene Diene Monomers Mixing Process
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