How to handle a splice so the camera does not false-alarm
When a splice passes, use a splice sensor to ignore a fixed length after it, for example 2 metres. Do not loosen the whole-roll threshold for the splice. Record that length on the roll. If the contract says the splice itself fails, that spot still alarms. Do not count the good artwork before and after.
When a splice passes, use a splice sensor to ignore a fixed length after it, for example 2 metres. Do not loosen the threshold for the whole roll because of the splice. Write that length on the roll so it is not counted as a defect, and so a genuinely bad splice is not hidden. If the contract says the splice itself is not allowed, that spot still alarms. Do not count the good artwork before and after it.
Loosening the threshold hurts the whole roll
The artwork at a splice is bound to differ from the template. Without an ignore, every splice throws a long string of alarms. If the threshold is loosened for that reason, dirt after the splice also stops alarming. The right action is that the sensor, once it arrives, pauses comparison only for the following fixed length. Set the length to the actual splice tape plus a little margin, then resume automatically.
Write those metres on the defect map and label them splice, not defect. If the customer does not accept splices, keep the alarm on the splice itself and ignore only the artwork blocked before and after the tape. Do not fold the two into one “ignore everything”.
How to set it
| Contract | At the splice | Artwork before and after |
|---|---|---|
| Splices allowed | Record as splice, not as a defect | Ignore for the tape length |
| Splices not allowed | Still alarm | The artwork the tape has spoiled may be ignored |
| No sensor | Fit one first | Do not substitute a looser threshold |
Check at a job change
- Run one splice and see whether comparison resumes just a little past the tape.
- The first real dirt spot after the splice must still alarm.
- On the map, the label at that place is splice, not dirt.
