Roundwood pre-grading with longitudinal acoustic waves for production of structural boards View Full Text


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Article Info

DATE

2014-01

AUTHORS

Andreas Rais, Hans Pretzsch, Jan-Willem G. van de Kuilen

ABSTRACT

The assessment of timber quality at any stage of the production chain promises to be an advantage for the forest and timber industry. This paper presents results of wood pre-grading by means of the dynamic modulus of elasticity, which was performed along the complete processing chain—from standing trees to sawn timber. The measurements were conducted on 154 forty-year-old trees of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) from two forest experimental stands in Southern Germany. Long logs of about 13 m were bucked into short logs of 4.1 m; the dataset contained 1,820 boards cut out of 332 short logs. Pre-grading was performed at different levels: standing tree, long log, and short log. The boards were machine strength graded by a ViSCAN-COMPACT grading machine. The investigation showed high correlations between different stages in the production chain of timber. For strength classes C24 and C30 an increase in yield of about 10 percentage points by rejecting the 25 % worst logs (short or long) was observed. It did not matter if pre-grading was realized at the stage of long logs or short logs. However, methods of pre-grading at standing tree must be improved to obtain reliable prediction of dry sawn timber quality of managed forest stands (r2 = 0.17). More... »

PAGES

87-98

References to SciGraph publications

  • 2011-05. Influence of moisture content of wood on sound velocity and dynamic MOE of natural frequency- and ultrasonic runtime measurement in EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
  • 2000-11. Sorting of logs using acoustics in WOOD SCIENCE AND TECHNOLOGY
  • 1998-09. Mechanical properties of sawn timber from Norway spruce in EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
  • 1984-06. Ein neues Meßverfahren zur Bestimmung des Elastizitätsmoduls von Holz in EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
  • 2012-09. Einfluss von Temperatur und Holzfeuchte auf die dynamischen Eigenschaften von unsortierten Fichtenbrettern in EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
  • 2006-03. Acoustic measurements on standing trees, logs and green lumber in WOOD SCIENCE AND TECHNOLOGY
  • 2006-08. Modulus of elasticity of Norway spruce saw logs vs. structural lumber grade in EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s00107-013-0757-5

    DOI

    http://dx.doi.org/10.1007/s00107-013-0757-5

    DIMENSIONS

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