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R.U. Kuruppu, Chairman of the Textile Institute, Sri Lanka Section, presented a paper on the research he had carried out on Process Control, at a seminar recently under the patronage of the Textile Institute at the Phoenix College of Clothing Technology Auditorium.

He said that there are two types of processes in the Clothing Manufacturing Cycle Primary process and Secondary processes. The Primary Process is the main assembly process that drives the components from the beginning to the end. There are several secondary processes that support the Primary Process. He said these processes must be controlled as both are equally important to produce accepted quality products.

Control is not just only sustaining the present level of operation but it is also a kind of improvement as well. Control consists of exercising, present capabilities and sustaining them at their optimum level and improving those capabilities. "Don't continue operating at the present base level but improve the process so that it could reach the entitlement level. Having consolidated this situation, improve it to another level and move forward, step by step, he said.

Kuruppu said that people in the industry confuse Production Capacity with Process Capability. Production Capacity is quantitative performance whilst process Capability is qualitative performance. He defined Process Capability as "the performance of a process in terms of fraction defectives".

In his study he had selected a number of large scale clothing factories ranging from light sew to medium weight clothing companies. Studies have been carried out on Process Capability and Efficiency.

He had found a positive correlationship between in-line and end line reject percentages. There is also a negative correlationship between the Productivity Index and Line Efficiency. This effect is mainly due to Off-Standard time, he said. There is ample evidence to prove that low rejection level at line end did not improve the line efficiency.

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