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Estimation of curl in paper using a combination of shape measurement and least-squares modelling
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.ORCID iD: 0000-0003-3811-062X
2001 (English)In: Optics and lasers in engineering, ISSN 0143-8166, E-ISSN 1873-0302, Vol. 35, no 2, p. 105-120Article in journal (Refereed) Published
Abstract [en]

Curl is a quality problem that makes paper less suitable for printing. A paper sheet that has structural variations in its thickness such as gradients of fibre orientation, density and filler content, will curl and hence assume a cylindrical shape when its humidity content is changed. We propose a method to measure curl that can be used for automated analysis of the paper quality. The shape of the curled paper is measured using a stereoscopic camera system, which is capable of viewing a random pattern that is projected onto the specimen. The shape of the object is found by calculating the perspective difference in the camera set-up using digital image correlation. The quality parameters that are searched for are the magnitude of curl, which is defined as the inverse of the radius of curvature and the orientation of the curled paper. These parameters are estimated by performing a least-squares fit of a cylindrical shape to the three-dimensional measurement

Place, publisher, year, edition, pages
2001. Vol. 35, no 2, p. 105-120
National Category
Applied Mechanics Computational Mathematics Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Experimental Mechanics; Scientific Computing; Industrial Electronics
Identifiers
URN: urn:nbn:se:ltu:diva-11212DOI: 10.1016/S0143-8166(00)00109-3ISI: 000168015900004Scopus ID: 2-s2.0-0035246924Local ID: a20c83b0-b12f-11db-bf9d-000ea68e967bOAI: oai:DiVA.org:ltu-11212DiVA, id: diva2:984161
Note
Validerad; 2001; 20060929 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Berglund, TomasSöderkvist, Inge

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