The use of an optical profilometer to measure surface roughness in medium density fiberboard
In the drive for higher quality wood products, it is important to monitor surface quality at different stages of processing. Examples of where information on the surface roughness or topography can be advantageous include: monitoring the performance of sawing, planing, or abrasive processes; predict...
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Published in | Forest products journal Vol. 46; no. 11/12; p. 73 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Madison
Forest Products Society
01.11.1996
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Subjects | |
Online Access | Get full text |
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Summary: | In the drive for higher quality wood products, it is important to monitor surface quality at different stages of processing. Examples of where information on the surface roughness or topography can be advantageous include: monitoring the performance of sawing, planing, or abrasive processes; predicting adhesive joint performance; and assuring integrity of thin surface laminates. This study was designed to determine the sensitivity of a laser-based optical profilometer to quantify degrees of surface roughness and to detect certain machining defects on wood composites after sanding. In addition, the best parameter or combination of parameters extracted from the output signals would be determined. While previous work by the authors has shown the feasibility of applying this technology to various types of wood fiber composites, only medium density fiberboard (MDF) was studied. A matched set of MDF specimens was obtained from the National Particleboard Association (NPA) and sanded in triplicate with 80-, 120-, 150-, 180-, and 220-grit abrasives. After scanning, two specimens (sanded with 80 and 120 grit) were exposed to 18 percent equilibrium moisture content for 48 hours and rescanned to determine the sensitivity of the technique to raised grain. Additional machining defects were provided accidentally when the drum sander generated snaking on the surfaces of some specimens. NPA provided several specimens with manufacturing defects, including some with pitting and some that had been sanded sequentially with 80 and 120 grit but had some 80-grit marks. The laser system was found to be sensitive to a range of grit marks and all of the above-mentioned defects |
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Bibliography: | 9716750 K50 |
ISSN: | 0015-7473 2376-9637 |