TAPPI TIP 0304-70 2006 presents a practical method for monitoring process variation when production runs are too short for conventional statistical process control techniques. The paper explains how to standardize measurements from different order items and characteristics so they can be plotted on common X-bar and R charts with consistent control limits.
Topics include short-run SPC theory, control-limit calculations, target mean and range selection, charting procedures, statistical factors, sample calculations, and an example involving different corrugated box characteristics. It is intended for quality professionals, process engineers, and manufacturing personnel who need to evaluate time-related process changes across varied small-lot production.
Application Scope: Corrugated box, sheet, die-cut, and other paper-based manufacturing operations with frequent changeovers, small lot sizes, and multiple product characteristics measured on shared equipment.
