Better quality control depends on process optimization. Online virtual measurements are created from the combination of available online and/or offline process and product measurements to give visibility into process performance and improvement areas.
First, a strength model is created using historical machine data to establish an initial expectation of the accuracy of the calculated strength. Multiple data modeling steps are followed, including synchronizing data based on time as well as cleaning, filtering, validating and more.
Once the accuracy of an initial model is confirmed, it is implemented for a site-specific online calculated strength measurement based on a mill's paper machine configuration. The virtual measurement calculation is further improved by gaining a better understanding of machine operation, systematic model refinement, and the implementation of measurement suspension events during periods of un-modeled machine operation. Ongoing performance monitoring is done to maintain and optimize the strength calculation.