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Processing roughness of sanded wood surfaces

Verarbeitungsbedingte Rauhigkeit geschliffener Holzoberflächen

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Abstract

Any quantitative evaluation of a sanded surface requires that the data be filtered to remove form errors and waviness. Wood surfaces contain irregularities due to both the sanding process and the anatomy, so the anatomical roughness must be excluded from any measurement of the surface if the processing roughness is to be properly evaluated. The efficacy of a number of standard filters was examined to see if they were suitable for oak, beech and spruce surfaces sanded with P1000 grit. Filters in current standards introduced distortions, but a robust Gaussian filter, contained in a draft standard, appeared to give roughness profiles free of distortions. The processing roughness and anatomical roughness, contained in the filtered profile, were separated with an algorithm based on a threshold defined in the material ratio curve. Work is continuing to compare the properties of different grit size and species combinations.

Zusammenfassung

Alle quantitativen Untersuchungen einer abgeschliffenen Oberfläche setzen voraus, dass die Daten gefiltert werden, um Formfehler und Schwankungen zu vermeiden. Holzoberflächen besitzen aufgrund des Schleifprozesses und ihrer Zusammensetzung Unregelmäßigkeiten; diese müssen bei jeder Messung der Oberfläche ausgeschlossen werden, damit der durch den Schleifprozess hervorgerufene Rauheitsgrad korrekt bestimmt werden kann. Die Wirksamkeit einer Reihe üblicher Filter wurde untersucht, um festzustellen, ob sie für Eichen-, Birken- und Fichtenholz geeignet sind, die jeweils mit P1000 Körnung bearbeitet worden waren. Filter, die gegenwärtigen Standards entsprachen, führten zu Verformungen, ein robuster Gaussfilter schien jedoch ein verformungsfreies Profil zu liefern. Verarbeitungs- und materialbedingte Rauhigkeit wurden im Filterprofil berücksichtigt und herausgerechnet. Die Arbeit wird fortgesetzt, um die Eigenschaften bei Kombination unterschiedlicher von Körnung und Materialien zu untersuchen.

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Authors and Affiliations

  1. Forest Products Research Centre, Buckinghamshire Chilterns University College, Queen Alexandra Road, High Wycombe HP11 2JZ, UK

    L. Gurau & H. Mansfield-Williams

  2. 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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Correspondence to L. Gurau.

Additional information

The authors gratefully acknowledge the use of the TALYSCAN 150 surface scanner at 3 M, Atherstone, and the helpful assistance of 3 M staff.

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Gurau, L., Mansfield-Williams, H. & Irle, M. Processing roughness of sanded wood surfaces. Holz Roh Werkst 63, 43–52 (2005). https://doi.org/10.1007/s00107-004-0524-8

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