Pack check fail unit may have a potential to pack into box without Pack check completion due to quick operation proceeding at Pack check process
Unsatisfied communication between operators
Visual Fail Unit is held at bench-side, but may have a potential as mix unit until bagging completion by next operator
Careless handling or non-rigid HOLD
Finally many box may be shifted-HDD with 1-unit to next box accidentally
Chronological miss-shipment pattern
These comes from multi-operator operation as sequential
Some operator can’t keep one-by-one operation satisfactorily
Fatigue/sleepiness/careless may have the potential