How to inspect a carton after embossing without calling the emboss a defect
After embossing, the raised edge throws a shadow, and the camera easily calls it a dirt line. Mark the embossed area on its own and build the template from the signed sample after embossing.
After embossing, the raised edge throws a shadow, and the camera easily calls it a dirt line. Mark the embossed area on its own and build the template from the signed sample after embossing. Do not use the flat print from before embossing. Missing print outside the emboss is still inspected.
Why it is judged this way
Emboss is the height of the paper, not the amount of ink. When the light is angled, the edge becomes a black line. That line can run the same way as a doctor blade line, but on every sheet it sits in the same place in the artwork. A line that follows the artwork is the emboss. A line fixed on the machine is a doctor blade or a scratch.
What to compare
| What you see | What to call it | What not to do |
|---|---|---|
| A black line follows the embossed artwork | Treat it first as an emboss shadow | Stop the press and change the blade |
| A black line runs with the machine and stays put when the sheet changes | Check for a scratch or a blade line | Draw it into the emboss area and let it pass |
| Missing print appears outside the emboss | Stop it as missing print | Loosen the whole sheet because there is emboss |
At job change or when a roll is opened
- Build the template from the signed sample after embossing.
- Mark the embossed area on its own.
- Place a missing print outside the emboss and confirm it still alarms.
