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Improving Rubber Mixing Performance of Hot Water Bag Compound

Summary: [This abstract is based on the author's abstract.] An Indian manufacturer of medical products was experiencing an unacceptable level of rework at the rubber mixing stage in the manufacture of hot water bottles. Regression analysis showed that the process parameters, the temperature of the dispersion kneader, and the temperature of the open mill, with adjusted R² values, can predict both the scorch time and the optimal cure time. Subsequent analysis produced optimum levels of these temperatures and revealed that the mixing technique of the four operating groups was inconsistent, indicating a need for further training. The study resulted in the reduction of the amount of rework, which in turn led to reduced process cycle time and cost of production.

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  • Topics: Engineering
  • Keywords: Process control, Process variability, Analysis of variance (ANOVA), Bartlett corrections, Defects, Regression analysis, Medical devices, International case study
  • Author: Mukhopadhyay, Arup Ranjan
  • Journal: Quality Engineering