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Magazine articles
Paper bending stiffness and web tension measurement from a running web using a vacuum and computer imaging, TAPPI Journal May 2023
ABSTRACT: A novel method for measuring the bending stiffness of paper online during manufacturing is introduced. The method uses photometric stereo imaging to detect the shape of the deflection surface caused by a controllable pressure difference over the paper’s surfaces. The hardware for the measurement is based on a combination of two existing sensors, which has accelerated and facilitated the development of the implementation. The deflection and loads are tied together by the governing differential equation for the bending of an orthotropic elastic plate with selected simplifications. An approach to resolve material parameters and in-plane loads without knowledge of traditional boundary conditions is suggested. The presented method was tested in a paper mill during manufacturing. For bending stiffnesses measured online, correlation coefficients 0.88 and 0.92 were obtained compared to state-of-the-art laboratory measurements. However, the results gained from a moving web are noisy and the data requires correction of the slope and an off-set. Although several issues remain to be resolved before the method can be considered as an accurate measurement for industrial use, the theoretical background, the performance of online implementation, and the results are promising. Possible causes for the observed discrepancies and the future development of the method are discussed.
Magazine articles
Slotted headbx screening for fine, publication, and newsprint grades, TAPPI JOURNAL, April 1990, Vol. 73(4)
Slotted headbx screening for fine, publication, and newsprint grades, TAPPI JOURNAL, April 1990, Vol. 73(4)
Magazine articles
Highly alloyed stainless steels to cope with corrosion, TAPPI JOURNAL, December 1990, Vol. 73(12)
Highly alloyed stainless steels to cope with corrosion, TAPPI JOURNAL, December 1990, Vol. 73(12)
Magazine articles
Chemically structured kaolin: a new coating pigment, TAPPI JOURNAL, February 1990, Vol. 73(2)
Chemically structured kaolin: a new coating pigment, TAPPI JOURNAL, February 1990, Vol. 73(2)
Magazine articles
Pump bearings: a new bearing system to improve reliability, TAPPI JOURNAL, March 1990, Vol. 73(3)
Pump bearings: a new bearing system to improve reliability, TAPPI JOURNAL, March 1990, Vol. 73(3)
Magazine articles
Steam cycle passivation and corrosion protection, TAPPI JOURNAL, March 1990, Vol. 73(3)
Steam cycle passivation and corrosion protection, TAPPI JOURNAL, March 1990, Vol. 73(3)
Magazine articles
Measuring customer perception of print quality, TAPPI JOURNAL, March 1990, Vol. 73(3)
Measuring customer perception of print quality, TAPPI JOURNAL, March 1990, Vol. 73(3)
Magazine articles
The behavior-based approach to safety: a clear picture, an effective plan, TAPPI JOURNAL, August 1991, Vol. 74(8)
The behavior-based approach to safety: a clear picture, an effective plan, TAPPI JOURNAL, August 1991, Vol. 74(8)
Magazine articles
Controlling anaerobic bacteria to improve product quality and mill safety, TAPPI JOURNAL, February 1991, Vol. 74(2)
Controlling anaerobic bacteria to improve product quality and mill safety, TAPPI JOURNAL, February 1991, Vol. 74(2)
Magazine articles
Alkaline peroxide mechanical pulping of hardwoods, TAPPI JOURNAL, June 1991, Vol. 74(6)
Alkaline peroxide mechanical pulping of hardwoods, TAPPI JOURNAL, June 1991, Vol. 74(6)