Even though equipment operations and plastic compounded materials have understandable and controllable variables that influence processing, the usual most uncontrollable variable in the process can be the plastic material. The degree of properly compounding or blending by the plastic manufacturer, converter, or in-house by the fabricator is important. With the passing of time and looking ahead, existing material and equipment variabilities are continually reduced due to improvement in their manufacturing and process control capabilities. However they still exist.

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