How to split a scratch on corrugated preprint from a lookalike
On corrugated preprint, split a scratch this way: a doctor-blade line is too much ink or too little, and the sheet surface is not necessarily broken. Until you can tell them apart, do not adjust the press for the wrong cause. A fine bright line in the web direction, and the ink film is scraped open.
On corrugated preprint, split a scratch this way: a doctor-blade line is too much ink or too little, and the sheet surface is not necessarily broken. Until you can tell them apart, do not adjust the press for the wrong cause. A fine bright line in the web direction, and the ink film is scraped open.
Name it wrong and you adjust the wrong place
A fine bright line in the web direction, and the ink film is scraped open. Call it something else and you skip this step: check the idler rolls and burrs first. Do not adjust the ink. The barcode and the product name decide whether it can go. They do not decide what you call it.
How to split them
| What you see | Closer to | How you split them |
|---|---|---|
| A fine bright line in the web direction, and the ink film is scraped open. | a scratch | Naming it off a single white spot |
| A doctor-blade line is too much ink or too little. The sheet surface is not necessarily broken. | Treat it as that other defect | Using the same adjustment |
| It sits on the barcode and the product name | Hold this area first | Ignoring the position just to give it a name |
Confirm it on the spot
- Look, by eye or with a loupe: A fine bright line in the web direction, and the ink film is scraped open.
- Rule out: A doctor-blade line is too much ink or too little. The sheet surface is not necessarily broken.
- Check the idler rolls and burrs first. Do not adjust the ink.
