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Monday, February 22, 2016

How Can Formation, Retention and Coating Quality be Analyzed More Quickly?

As with all critical production and quality parameters, it is always a challenge to get information more quickly. If information is available on formation, retention and coating quality quickly, it can improve production efficiency in terms of throughput, correcting problems and faster grade changes. Who wouldn't want:

  • 12.5% production increase of liquid packaging board machine from 576 ton/day to 648 ton/day
  • 25% speed increase of a cigarette paper machine from 300 m/min to 400 m/min
  • Much faster grade changes in production of nonwovens
  • 10 kWh/ton energy savings with better control of refining

In 2007, a presentation at APPITA (technical association serving the Australian and New Zealand Pulp and Paper Industry) 60th anniversary conference in Gold Coast, Australia expressed how using online porosity measurements could lead to quick information resulting in better quality and runnability. Since then, nearly 200 units have been installed, looking at applications like these.




These are all relationships that are evaluated on laboratory equipment, however, having this information real-time, allows for quicker adjustments and fewer rejects.








Again, seeing the information faster, allows for adjustments to the process and better overall quality and runnability.



In the coating or application of OBA, a less porous sheet gives more "hold-out", meaning that a high percentage of the coating or OBA remains on the surface rather than penetrating below the surface pores. This results in better surface and optical properties for a given coat-weight or OBA-weight application.