What is a golden template, and when should it be relearned
A golden template is the signed-sample image you compare against, not the average of recent sheets. Relearn when the plate, anilox, artwork, or signature changes. A defect learned into the template will not alarm later. Do not relearn mid-run because alarms are frequent.
A golden template is the signed-sample image you compare against. It is not the average of the last few dozen sheets. Relearn it when the plate changes, the anilox changes, the artwork changes, or the job is signed again. If a defect that appears during the run is learned into the template, the same defect later will not alarm. Do not relearn from the current frame in the middle of a run just because alarms are frequent.
When the old template stops being valid
A new plate, even if the artwork looks the same, changes dot edges. The old template will call the normal new plate a defect, or the other way around: it will learn a defect as normal. A new anilox changes solid depth, so relearn on the new signed sheet. A slow darkening inside one roll, still inside tolerance, does not need a relearn. Using a relearn to follow that drift pulls the defects along with it.
Before a relearn, a person has to judge that this sheet is an acceptable signed sample. The system must not decide for itself that the recent stretch was quiet, so learn now.
Relearn or not
| What happened | Template |
|---|---|
| New plate, new art, new anilox, or a new signature | Relearn from the new signed sheet |
| Same plate, only more alarms | Do not relearn. Check threshold, light, and material |
| Color has drifted and nobody has signed again | Do not relearn |
| After learning, that sheet itself had dirt | Void it and relearn from a clean sheet |
Check before the job runs
- Confirm which signed sheet the current template’s time belongs to.
- The first act after a plate change is a relearn, not a looser threshold.
- After the relearn, try a known defect and confirm it still alarms.
