Dynamic Clamping Force Calibration for Non-Rigid Thermoplastic Metrology
Dynamic clamping calibration uses closed-loop load feedback to prevent viscoelastic creep and contact deflection during non-rigid thermoplastic inspection.
False Rejection Rate
Meaning
A statistical measure in quality control representing the frequency at which acceptable parts are incorrectly identified as non-conforming. In high volume injection moulding, a high false rejection rate increases production costs by discarding functional items and wasting energy. This metric is usually calculated by dividing the number of good parts rejected by the total number of parts inspected.
Sensitivity Level
Setting inspection limits too tight on an automated vision system often triggers this issue. The false rejection rate rises when the software cannot distinguish between a cosmetic blemish and a functional defect like a short shot. Adjusting the threshold for color variation or surface texture helps maintain throughput without sacrificing quality.
Economic Consequence
Financial losses from unnecessary scrap include the cost of the raw resin and the machine time used to produce the rejected part. Even when material is recovered as regrind, the energy used for grinding and the loss of molecular weight during reprocessing represent a net drain on the margin. A low false rejection rate ensures that the moulder stays competitive by maximizing the yield of first quality parts.
System Calibration
Regular maintenance of sensors and cameras prevents the drift that leads to inaccurate sorting.