How to trial a system on your worst job, not your best-looking one
Trial the system on your hardest job: the most reflective, the finest type, or the one that false-rejects most easily. The conclusion covers only the material that was run.
A trial belongs on your hardest job: the most reflective, the finest type, or the one that false-rejects most easily. Nice coated paper is a pass for anyone. The trial conclusion is valid only for the material that was run. Do not write that every product can be inspected.
Why it is judged this way
A supplier willing to show their own sample roll is giving an introduction, not a trial. A trial takes time on your press, at the real speed. Write beforehand which roll, how long, which defects must be reported, and how a false reject is counted. Without that sheet, the trial ends as only an impression.
What to compare
| What you see | What to call it | What not to do |
|---|---|---|
| On the hard roll, everything that should alarm did alarm | This class of material can be considered | Extend it to every product |
| Good paper passed and metallised was not tried | Metallised is still unknown | Write that it can do everything |
| The length was not recorded | It does not count | Buy on a feeling |
At job change or when a roll is opened
- Name the hardest roll and the defects that must be reported.
- Run at production speed.
- Write the material name. Do not write that it applies to everything.
