Definition: Slurring takes place when slippage during the image transfer process.
Problem: Poor tension control.
Description: If the printing units have too much control of the nip, it may cause tension variations from unit to unit.
Solution: Increase or decrease the tension at your infeed unit until it goes away. Follow the basic tension principles for web offset printing.
Problem: Poor blanket tension.
Description: The blanket is loose and not secured to the printing cylinder.
Solution: Torque the blanket to spec. To not over tighten as this will cause other problems. It should only be tight enough to prevent slippage and preserve it's properties.
Problem: Form oscillation.
Description: Form rollers that are designed to help with ghosting, will move from side to side. This is good only to the extent that it will prevent ghosting.
Solution: Many times the oscillation can be turned off by securing the ends of the roller.
Problem: Worn gears or bearings.
Description. Bearings or gears that are starting to wear will cause slight hesitations in the printing unit or even gear streaks.
Solution: Check the following - cylinder bearings, gears and even form roller bearings. Replace any that are worn or simply heating up during the run.
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Problem: Poor tension control.
Description: If the printing units have too much control of the nip, it may cause tension variations from unit to unit.
Solution: Increase or decrease the tension at your infeed unit until it goes away. Follow the basic tension principles for web offset printing.
Problem: Poor blanket tension.
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| Typical slur patch |
Solution: Torque the blanket to spec. To not over tighten as this will cause other problems. It should only be tight enough to prevent slippage and preserve it's properties.
Problem: Form oscillation.
Description: Form rollers that are designed to help with ghosting, will move from side to side. This is good only to the extent that it will prevent ghosting.
Solution: Many times the oscillation can be turned off by securing the ends of the roller.
Problem: Worn gears or bearings.
Description. Bearings or gears that are starting to wear will cause slight hesitations in the printing unit or even gear streaks.
Solution: Check the following - cylinder bearings, gears and even form roller bearings. Replace any that are worn or simply heating up during the run.
I can't find my problem.
Start Over :Web Press Troubleshooting Guide
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