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Form error removal of sanded wood surfaces

Rechenverfahren zur Ausschaltung grober Porenrillen bei der Bewertung geschliffener Holzoberflächen

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Abstract

According to ISO 3274 form errors can be removed by fitting a polynomial regression through the original measured data called the total profile to obtain the primary profile. For wood surfaces it was found that the regression was affected by the presence of deep and grouped pores.

To obtain a primary profile free of distortion, the deep pores can be removed from the total profile prior to applying the regression. A method was developed that eliminated the pores entirely. The efficacy of this method was tested visually and by comparing coefficients of determination r2 between the polynomial regression according to ISO 3274 (1996) and the total profile and the modified regression line when the effect of deep pores was removed and the modified profile that had no pores.

The influence of the shape of the primary profile obtained by the standard method in ISO 3274 (1996) on further digital processing was tested on roughness profiles filtered with a Robust Gaussian Regression Filter. The undistorted primary profile was taken as a reference.

Zusammenfassung

Gemäß ISO 3274 können grobe Porenrillen ausgeschaltet werden, indem eine Polynomfunktion an die Rohdaten, das so genannte Gesamtprofil, angepasst wird, um das Primärprofil zu erhalten. Es hat sich gezeigt, dass bei Holzoberflächen die Regression durch tiefe Poren beeinflusst wurde. Um ein ungestörtes Primärprofil zu erhalten, wurden die tiefen Poren vor Durchführung der Regressionsanalyse vom Gesamtprofil entfernt. Eine Methode, welche die Poren vollkommen ausschließt, wurde entwickelt. Die Wirksamkeit dieser Methode wurde sowohl visuell geprüft als auch durch Vergleich des Bestimmtheitsmaßes r2 zwischen der Regressionskurve nach ISO 3274 (1996) und dem Gesamtprofil sowie zwischen der Regressionskurven, die sich bei Verwendung der Methode mit vorheriger Ausschaltung der Poren ergaben, und dem modifizierten porenfreien Profil.

Der Einfluss der Form des Primärprofils nach dem Standardverfahren gemäß ISO 3274 (1996) auf die weitere Bearbeitung wurde an Rauhigkeitsprofilen überprüft, die mit einem robusten Gaußfilter gefiltert wurden. Das ungestörte Primärprofil diente als Referenzprofil.

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Authors and Affiliations

  1. Department of Wood Technology, Faculty of Wood Industry, Str. Colinei Nr. 1, 500084, Brasov, Romania

    L. Gurau & M. Cionca

  2. Trada Technology, Chiltern House, Stocking Lane, Hughenden Valley, High Wycombe, HP14 4ND, Buckinghamshire, UK

    H. Mansfield-Williams

  3. École Superiéure du Bois, Rue Christian Pauc, BP 10605, 44306, Nantes, Cedex 3, France

    M. Irle

Authors
  1. L. Gurau
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  2. H. Mansfield-Williams
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  3. M. Irle
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  4. M. Cionca
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Correspondence to L. Gurau.

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Gurau, L., Mansfield-Williams, H., Irle, M. et al. Form error removal of sanded wood surfaces . Eur. J. Wood Prod. 67, 219–227 (2009). https://doi.org/10.1007/s00107-009-0310-8

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  • DOI: https://doi.org/10.1007/s00107-009-0310-8

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