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Phase-Contrast and Spectroscopic X-ray Imaging for Paperboard Quality Assurance
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för elektronikkonstruktion. (Radiation Sensor Systems)
2014 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The end-use performance of a paperboard depends on its quality.

The major properties of a good quality paperboard include consistency

in the expected ratio between the thickness of the core and

the coating layers, and the uniformity in the coating layer. Measurement

systems using X-rays to monitor these properties could assist

the paperboard industries to assure the quality of their products in a

non-destructive and automatic manner.

 

Phase Contrast X-ray Imaging (PCXI) has been used successfully

to look inside a wide range of objects using synchrotron radiation

sources. Recent advancements in the grating interferometer based

PCXI technique enables high quality phase-contrast and dark-field

images to be obtained using conventional X-ray tubes. The darkfield

images map the scattering inhomogeneities inside objects and

is very sensitive to micro-structures, and thus, can reveal useful information

about the object’s inner structures, such as, the fibre structures

inside paperboards.

 

In this thesis, methods, using spectroscopic X-ray imaging and

PCXI technique have been demonstrated to measure paperboard quality.

The thicknesses of the core and the coating layers on a paperboard

with the coating layer on only one side can be measured using

spectroscopic X-ray imaging technique. However, the limited

spectral and spatial resolution offered by the measurement system

being used led to the measured thicknesses of the layers being lower

than their actual thicknesses in the paperboard sample. Suggestions

have been made in relation to overcoming these limitations and to

enhance the performance of the method.

 

The dark-field signals from paperboard samples with different quality

indices are analysed. The isotropic and the anisotropic scattering

coefficients for all of the samples have been calculated. Based

on the correlation between the isotropic coefficients and the quality

indices of the paperboards, suggestions have been made for paperboard

quality measurements.

sted, utgiver, år, opplag, sider
Sundsvall: Mid Sweden University , 2014. , s. 96
Serie
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 110
HSV kategori
Identifikatorer
URN: urn:nbn:se:miun:diva-21910Lokal ID: STCISBN: 978-91-87557-46-0 (tryckt)OAI: oai:DiVA.org:miun-21910DiVA, id: diva2:715837
Presentation
2014-05-22, M102, Sundsvall, 10:15 (engelsk)
Opponent
Veileder
Forskningsfinansiär
Knowledge FoundationTilgjengelig fra: 2014-05-12 Laget: 2014-05-06 Sist oppdatert: 2017-03-06bibliografisk kontrollert
Delarbeid
1. Non-Destructive Method to Resolve the Core and the Coating on Paperboard by Spectroscopic X-ray Imaging
Åpne denne publikasjonen i ny fane eller vindu >>Non-Destructive Method to Resolve the Core and the Coating on Paperboard by Spectroscopic X-ray Imaging
2013 (engelsk)Inngår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 28, nr 3, s. 439-442Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Quality control is an important issue in the paperboard industry. A typical sheet of paperboard contains a core of cellulose fibers [C6H10O5], coated on one or both sides with layers of calcium carbonate [CaCO3] or Kaolin [Al2Si2O5(OH)4]. One of the major properties of a good quality paperboard is the consistency of the expected ratio between the thickness of the core and the coating layers. A measurement system to obtain this ratio could assist the paperboard industry to monitor the quality of their products in an automatic manner. In this work, the thicknesses of the core and the coating layers on a paperboard with coating layer on only one side were measured using an X-ray imaging technique. However, the limited spectral and spatial resolution offered by the measurement system being used led to the measured thicknesses of the layers being lower than their actual thicknesses in the paperboard sample. Suggestions have been made in relation to overcoming these limitations and to enhance the performance of the method. A Monte Carlo N-particle code simulation has been used in order to verify the suggested method.

Emneord
Spectroscopic X-ray imaging, Thickness measurement of layers in paperboard, Paperboard quality
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-18400 (URN)000325145900014 ()2-s2.0-84883036103 (Scopus ID)STC (Lokal ID)STC (Arkivnummer)STC (OAI)
Tilgjengelig fra: 2013-01-31 Laget: 2013-01-31 Sist oppdatert: 2017-12-06bibliografisk kontrollert
2. Grating based phase-contrast X-ray imaging technique
Åpne denne publikasjonen i ny fane eller vindu >>Grating based phase-contrast X-ray imaging technique
2015 (engelsk)Inngår i: Radiation Detectors for Medical Imaging / [ed] Jan S. Iwanczyk and Krzysztof Iniewski, CRC Press, 2015Kapittel i bok, del av antologi (Fagfellevurdert)
sted, utgiver, år, opplag, sider
CRC Press, 2015
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-21021 (URN)STC (Lokal ID)9781498704359 (ISBN)STC (Arkivnummer)STC (OAI)
Tilgjengelig fra: 2014-01-13 Laget: 2014-01-13 Sist oppdatert: 2016-12-23bibliografisk kontrollert
3. Investigation on the directional dark-field signals from paperboards using a grating interferometer
Åpne denne publikasjonen i ny fane eller vindu >>Investigation on the directional dark-field signals from paperboards using a grating interferometer
Vise andre…
2014 (engelsk)Inngår i: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 9, s. Art. no. C04032-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Recent advancements in the grating interferometer based Phase Contrast X-ray Imag- ing (PCXI) technique enables high quality dark-field images to be obtained using conventional X-ray tubes. The dark-field images map the scattering inhomogeneities inside objects. Since, the dark-field image is constructed by considering only those photons which are scattered while pass- ing through the objects, it can reveal useful information about the object inner structures, such as, the fibre structures inside paperboards.

The end-use performance of paperboards, such as the printing quality and the stiffness de-pends on the uniformity in the thickness and the structures of the coating layer of the paperboards. The uniformity in the coating layer is determined by the coating techniques, the coating materials and the topography of the base sheet. In this article, the dark-field signals from four paperboard samples with different quality indices are analysed. The isotropic and the anisotropic scattering coefficients for all of the samples have been calculated. Based on the correlation between the isotropic coefficients and the quality indices of the paperboards, a new method for paperboard quality measurement has been suggested.

Emneord
Data processing methods, Inspection with x-rays, Interferometry, X-ray detectors
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-21822 (URN)10.1088/1748-0221/9/04/C04032 (DOI)000336123800032 ()2-s2.0-84899557220 (Scopus ID)STC (Lokal ID)STC (Arkivnummer)STC (OAI)
Tilgjengelig fra: 2014-04-24 Laget: 2014-04-24 Sist oppdatert: 2017-12-05bibliografisk kontrollert

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