Cross Machine Caliper Profile Control on High Speed Coated Packaging Lines
Cross-machine caliper control demands real-time induction calender profiling to maintain stiffness and prevent high-speed converting line jams.
Roll Hardness PAROtester
Measurement Device
Electronic evaluation of the winding density across a roll of paper or film uses a portable device that measures the rebound energy of a spring-loaded strike. The roll hardness PAROtester provides a numerical value representing the tightness of the outer layers, which is a critical indicator of potential winding defects. This tool allows operators to quickly check the entire width of a roll without causing damage to the material surface.
Impact Analysis
Striking the roll at multiple points generates a hardness profile that reveals any soft spots or excessively tight bands. The roll hardness PAROtester displays these results instantly, allowing for immediate adjustments to the winder tension or nip pressure. Consistent hardness is necessary to ensure that the roll remains stable during handling and unwinds smoothly at the customer facility.
Data from these tests can be stored to track production quality over time.
Quality Verification
Hardness levels that are too high can lead to core crushing or bursting of the inner layers, while levels that are too low result in telescoping or star-shaped deformation. By using a roll hardness PAROtester, mills can document the quality of their shipments and provide data to printers who need uniform rolls for high-speed runs. This objective measurement replaces the subjective method of tapping the roll with a stick or mallet.