In our processing line, we have the metal detector installed in the step after the bag are sealing.
We have test for the performance of detection of metal detector and found that it can detect the
standard test piece.Then the performance of the metal detector machine is no problem.
In the case the bag with metal inside pass through the metal detector it should be detected. Then
we suspect that the worker may not pass the bag through the metal detector.
For the source of metal contamination , as we have tract from the record we found the metal
came with the raw material supply. In the past year of raw material supply record we found the
metal fragment in chum salmon bone raw material many time (Please see photo). And this metal
still continue to found.