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Online Surface Topography Characterization Technique for Paper and Paperboard using Line of Light Triangulation
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier. (Electronics)
2012 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt) [Forskning på konstnärlig grund]
Ort, förlag, år, upplaga, sidor
Sundsvall: Mid Sweden University , 2012. , s. 64
Serie
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 75
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:miun:diva-15967Lokalt ID: STCISBN: 978-91-87103-02-5 (tryckt)OAI: oai:DiVA.org:miun-15967DiVA, id: diva2:506722
Presentation
2012-02-09, O102, Mittuniversitetet, Sundsvall, 10:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2012-02-29 Skapad: 2012-02-29 Senast uppdaterad: 2016-10-20Bibliografiskt granskad
Delarbeten
1. Investigation of the surface topographical differences between the Cross Direction and the Machine Direction for newspaper and paperboard
Öppna denna publikation i ny flik eller fönster >>Investigation of the surface topographical differences between the Cross Direction and the Machine Direction for newspaper and paperboard
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2011 (Engelska)Ingår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 26, nr 4, s. 468-475Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Paper and paperboard surface quality is constantly being improved by the industry. This improvement work deals with the essential fact that the surface topography must be measured, both in relation to offline and online measurements for the manufactured products. Most measurements relating to surface topography (especially online) are performed either in the machine direction (MD) or in the cross direction (CD). It has been the opinion of SCA Ortviken AB and Iggesund Paperboard AB that the surface topography amplitudes are almost always higher in the CD than in the MD, for their products which consist of newspaper and paperboard. This article aims to investigate the rela-tionship between the CD and the MD surface topography amplitudes for a wide range of spatial wavelength for both newspaper and paperboard. The tests and investiga-tions have been conducted using an FRT Microprof profilometer within the range 20 μm up to 8 mm, and the results confirm that the surface topography amplitudes are higher in the CD for most of the shorter spatial wavelength within this range. The results also show significant differences between measurements for different paper qualities, suggesting a requirement to investigate the relationship between the CD and the MD topography for all paper and paperboard qualities of interest for a paper or paperboard mill, before a decision is made in relation to a measurement method.

Nyckelord
Paper surface measurement, Roughness measurement, Surface topography, Optical measurement, spectral analysis, Cross Direction (CD), Machine Direction (MD), Paperboard, Newspaper
Nationell ämneskategori
Inbäddad systemteknik
Identifikatorer
urn:nbn:se:miun:diva-15060 (URN)000298868000014 ()2-s2.0-84855528544 (Scopus ID)STC (Lokalt ID)STC (Arkivnummer)STC (OAI)
Tillgänglig från: 2011-12-11 Skapad: 2011-12-06 Senast uppdaterad: 2017-12-08Bibliografiskt granskad
2. Online surface roughness characterization of paper and paperboard using a line of light triangulation technique
Öppna denna publikation i ny flik eller fönster >>Online surface roughness characterization of paper and paperboard using a line of light triangulation technique
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2012 (Engelska)Ingår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, nr 3, s. 662-670Artikel i tidskrift (Refereegranskat) [Forskning på konstnärlig grund] Published
Abstract [en]

Within both the paper and paperboard industries, real time monitoring and measurement of surface roughness of a paper moving at high velocities is an important and challenging area of research. The uniform surface, for an entire production, can be effectively achieved by monitoring and controlling the paper surface roughness, in real time during the manufacturing steps. Presently the majority of paper industries rely on traditional laboratory profilometers. The obvious limitations of lab profilometers are that these are slow, do not measure the quality of entire reels but rather deal with only a few small pieces of samples taken from the end of the reels and it is difficult to make any possible correction in the productionlines without knowing the online roughness data. To eradicate the disadvantages associated with conventional measurements, an online prototype instrument has been developed that measures the surface roughness during the manufacturing steps, and is based on a line of lighttriangulation technique. The prototype technique will be of assistance in ensuring tight process control in order to maintain both a better and auniform quality throughout the entire production. It measures the whole reel, meter by meter, in traditional units of roughness and is also capable of characterizing the topography in a wide range of wavelength spectra. The article presents the online analyses results obtained from the developed prototype. The real time measurements, in a paperboard pilot mill, have successfully characterized and distinguished 16 different grades of newspaper and paperboard reels including reels which have the same family of quality grades and materials.

Nyckelord
Laser application; Line of light triangulation; Newspaper; Online surface measurement; OnTop; Optical measurement; Paper; Paper roughness; Paper smoothness; Paperboard
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:miun:diva-15969 (URN)10.3183/NPPRJ-2012-27-03-p662-670 (DOI)000311020100018 ()2-s2.0-84862525400 (Scopus ID)STC (Lokalt ID)STC (Arkivnummer)STC (OAI)
Tillgänglig från: 2012-02-29 Skapad: 2012-02-29 Senast uppdaterad: 2017-12-07Bibliografiskt granskad
3. Online surface characterization of paper and paperboards in a wide-range of the spatial wavelength spectrum
Öppna denna publikation i ny flik eller fönster >>Online surface characterization of paper and paperboards in a wide-range of the spatial wavelength spectrum
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2012 (Engelska)Ingår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 258, nr 20, s. 7928-7935Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In the paper industry, surface topography is the essence of both paper and paperboard, and accurate topographical measurements are equally essential in order to achieve a uniform smooth surface. The traditional laboratory methods measure only a few samples from the entire tambour and there are other obvious limitations to this approach. Online measurements may be of significant value to improve the surface quality throughout the production. Roughness is one of the topography components and the majority of techniques measure paper by means of a single predictor of average roughness, R a which is inadequate in providing a comprehensive characterization of the surface. Measurements, in a wide range ofwavelengths, can characterize topography components such as roughness, waviness, cockling, etc. Online measurements were taken for various grades of 8 paper reels, containing the wireside and topsides for newspaper, and uncoated and coated sides of paperboards. Their surfacecharacterization, in the spatial wavelength spectrum, from 0.1 to 10 mm was obtained. This article presents the online characterizationresults which have efficiently distinguished the surfaces of same family materials including the edge and the middle position reels of fine coatedpaperboard. Online measurements were taken, at Iggesund Paperboard Pilot Coater in Sweden, by using a recently developed OnlineTopography (OnTop) device which is based on the principle of light triangulation. © 2012 Elsevier B.V. All rights reserved.

Nyckelord
Newspaper; Online paper measurements; Online topography; Paper spectral topography; Paperboard; Surface characterization
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:miun:diva-15970 (URN)10.1016/j.apsusc.2012.04.136 (DOI)000305940700022 ()2-s2.0-84862524529 (Scopus ID)STC (Lokalt ID)STC (Arkivnummer)STC (OAI)
Tillgänglig från: 2012-02-29 Skapad: 2012-02-29 Senast uppdaterad: 2017-12-07Bibliografiskt granskad

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