How to record a defect at a roll position the rewinder can find
The rewinder needs metres from this roll’s zero plus the distance from the operator side. A frame number that was never converted to those metres cannot be found. The zero must match the rewinder: core, splice, or unwind start, whichever the ticket names.
The rewinder needs metres from this roll’s zero, plus the distance from the operator side. A camera frame number that was never turned into those metres cannot be found on the rewinder. The zero must be the same one the rewinder uses: core, splice, or unwind start. Use whichever the ticket names.
Why a frame number is not enough
A frame number is the camera’s own count. After a roll change or a stop in the middle, it may not convert back to metres. The rewinder reads its own metre counter. If one side counts from the splice and the other from the core, they differ by the length from splice to core. At the start of inspection, line the two counters up once and write down which zero was used.
Metres without a cross-web position stop the rewinder on that metre, and a wide web still has to be searched by eye. Store the millimetres from the operator side as well. For a repeating defect, also store the repeat length, so the rewinder knows it will appear again.
What to store
| Field | Without it |
|---|---|
| Roll number | The stop lands on another roll |
| Metres from the same zero | The frame number does not meet the rewinder |
| Distance from the operator side | The right metre still does not show the spot |
Check at a job change
- Make a defect and write down the metres the system stored.
- Stop the rewinder at that metre and see whether it is the same place.
- If the miss is a fixed length, change the zero. Do not ask the operator to add it in their head.
