Improvement of production quality of trays to collect Covid-19 diagnostic samples from airlines passengers

Abstract

The objective of this research is to study guidelines of defects reduction in producing trays for collecting test tube of Covid-19 diagnostic samples. The goal is to limited defects from thermoforming process at less than 3,000 defect part per million (DPM) with Cpk =1.33. Current sigma level is =4, reduction methodology has been preceded by following DMAIC of Six Sigma techniques and simulate by general full factorial design for experimenting. The results showed that to reduce DPM in plastics thermoforming process was contributed from controlling level of heat temperature at 230-320°C and forming duration of 2 seconds. Defect is reduced from 0.0153 to 0.0062. Process capability index is improved from = 1.17 to = 1.33 and level of sigma has increased from = 3.5 to = 4.