How to read a vendor claim of 0.1 mm detection
A claim of 0.1 mm detection starts as a pixel calculation. Steady detection takes about 3 pixels, so one pixel is about 0.03 mm at your web width and speed.
When a vendor says the system can detect 0.1 mm, calculate the pixel first. Seeing it steadily takes about 3 pixels, so one pixel has to be about 0.03 mm, and that has to be at your web width and your speed. If the pixel cannot be that small, 0.1 mm is only a sentence. It is also not yet your release standard.
Why it is judged this way
A 0.1 mm that is possible on a narrow web is not possible when the web width doubles. Ask this: at our web width, at top speed, on this material, how many pixels does a 0.1 mm defect occupy, and did the trial roll report it. Without that picture, do not write 0.1 into the acceptance.
What to compare
| What you see | What to call it | What not to do |
|---|---|---|
| At your web width it is about 3 pixels, and the trial found it | The sentence has a basis | Only listen to the claim |
| The pixel is clearly larger | It cannot be reached | Still write it into the contract |
| It is visible at low speed and smeared at high speed | Calculate at top speed | Accept it at the demo speed |
At job change or when a roll is opened
- Calculate the pixel size at your web width.
- See how many pixels 0.1 mm occupies.
- If it does not reach, change the figure or change the setup.
