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Precision scan-imaging for paperboard quality inspection utilizing X-ray fluorescence
Mid Sweden University, Sweden.
Mid Sweden University, Sweden.
Mid Sweden University, Sweden.
RISE - Research Institutes of Sweden. (MoRe Research Örnsköldsvik AB)
2018 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 13, no 1, article id C01021Article in journal (Refereed) Published
Abstract [en]

Paperboard is typically made up of a core of cellulose fibers [C6H10O5] and a coating layer of [CaCO3]. The uniformity of these layers is a critical parameter for the printing quality. Current quality control methods include chemistry based visual inspection methods as well as X-ray based methods to measure the coating thickness. In this work we combine the X-ray fluorescence signals from the Ca atoms (3.7 keV) in the coating and from a Cu target (8.0 keV) placed behind the paper to simultaneously measure both the coating and the fibers. Cu was selected as the target material since its fluorescence signal is well separated from the Ca signal while its fluorescence's still are absorbed sufficiently in the paper. A laboratory scale setup is built using stepper motors, a silicon drift detector based spectrometer and a collimated X-ray beam. The spectroscopic image is retrieved by scanning the paperboard surface and registering the fluorescence signals from Ca and Cu. The exposure time for this type of setups can be significantly improved by implementing spectroscopic imaging sensors. The material contents in the layers can then be retrieved from the absolute and relative intensities of these two signals.

Place, publisher, year, edition, pages
Institute of Physics Publishing , 2018. Vol. 13, no 1, article id C01021
Keywords [en]
Inspection with x-rays, Spectrometers, X-ray fluorescence (XRF) systems, Calcium, Calcium carbonate, Calcium compounds, Coatings, Inspection, Paperboards, Stepping motors, Thickness measurement, Fluorescence signals, Paperboard surfaces, Relative intensity, Silicon Drift Detector, Spectroscopic images, Spectroscopic imaging, Visual inspection method, X ray fluorescence, Fluorescence, Image Analysis, Paper Boards
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-42470DOI: 10.1088/1748-0221/13/01/C01021Scopus ID: 2-s2.0-85041817589OAI: oai:DiVA.org:ri-42470DiVA, id: diva2:1384063
Note

Funding text 1: This work was funded by the Swedish KK-foundation. Johan Lindgren at Iggesunds Holmen Group provided the paperboard samples and necessary information for this work.

Available from: 2020-01-09 Created: 2020-01-09 Last updated: 2020-01-09Bibliographically approved

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