Vibration at press

1. Usually related to machine conditions:
— check for improperly balanced press rolls.
— check for malfunction in the press-loading system.
— eliminate soft spots on rubber covered rolls.
— eliminate flat spots on press rolls.
— can arise from leaving press loaded when not operating.
— check on natural frequency of vibration at given machine speeds.
— be aware that sympathetic vibrations related to another roll or press section can be transmitted through the press fabrics.
2. May also be related to fabric due to:
— variations in mass density of the press fabric.
— varying moisture content in the press fabric.
— check the press loading.
— ensure that the trade lines of the press fabric are not cocked.