Roll Hardness Profilers for Paper, Board, Films and Foils Compared Quick summary Roll hardness measurement is one of the few practical, non-destructive ways to understand the internal structure of wound rolls. It is used not only for paper and board, but also for plastic films, flexible packaging films, technical films,
Every mill knows the frustration of a “bad” roll — unscheduled downtime, customer complaints, wasted materials, and production delays. But what if you could detect roll defects before they cause expensive problems? The good news: you can. And it starts with understanding roll hardness profiles.
Using Hardness Variation (CV%) to Identify Defective Rolls “Papermaking would be easy, if only there were no edges!” Problem: Converter rejects were traced back to certain rolls, but the mill had no reliable way to identify them before shipment. Task: Find out a method to determine rolls that do not
Reducing plastic film roll rejections with roll hardness profiling A plastic film producer was experiencing quality issues: around 25% of produced rolls were rejected by the customer in converting. Visual inspection and process data did not explain the problem, as the rolls looked normal at the production site. The producer
Roll Hardness Profiles – What Can the Statistics Tell Us? Quality of rolls is not about appearance – it depends both on the rolled material and on how the roll has been wound. The hardness profile provides valuable insight into roll condition and helps detect faults that are often invisible
Hidden defects in rolls: a closer look with Tapio RQP Live A paper, board or plastic roll may appear perfectly fine on the outside. The surface layers may seem to be uniform, smooth, and free of any obvious defects. However, beneath the outer layers, hidden issues can exist that compromise