Measurement and correction of baggy edges on paper machines, 2011 PaperCon Conference

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A new tension beam was developed to measure the cross-machine directional tension profile of paper webs. The beam, composed of 50 individual Teflon pads resting on load cells, allows the measurement of the tension profile of a 1270 mm wide web. Tension profile measurements allow us to quantify the level of web bagginess with an accuracy of 5%. Tension analysis showed that the tension difference between the two edges of an edge roll can be as high as 200%. In most of the time, tension profile variations are related to cross-machine direction moisture variations. It was also found that drying history variations could cause tension profile non-uniformity in the cross-machine direction (CD). There are many possible ways to correct bagginess, particularly the reduction of CD moisture variations and the application of a moisture bias at the edges. Some common problems and solutions are described.