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| INCORRECT ROLLER SETTING AND THEIR EFFECTS |
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Setting too High:
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- This is due to partial squeezing, insufficient transfer of ink or dampening solution and consequently a bad printed image.
- High energy consumption, heavy temperature increase, cooling problems.
- Premature material fatigue, danger of a cover burst or separation of the core bonding.
- Higher abrasion of the printing plate by the high pressure of the forme rollers.
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| Setting too Low: |
- Irregular, interrupted transfer of ink and dampening solution.
- Disturbance of the ink-water balance, leading to scumming or smearing.
- Application of dampening solution too high, leading to faded printouts and smearing.
- If, due to bad transportation and slippage of the forme rollers wipe the ink beyond the dot and fill in the open parts of the plates.
- Insufficient compensation of tolerances and vibrations.
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| Uneven Setting: |
- The opening on one side is too large and squeezing on the other side too strong, leading to one-sided smearing or scumming.
- Setting at one side too high leads to local overheating with danger of failure of the roller cover or core bonding.
- One sided abrasion destroys the cylinder form.
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| Rest Setting: |
- Lasting deformation and in consequence, concentricity deviations of the roller cover.
- Streaks in the printout.
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