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...

Full description

Saved in:
Bibliographic Details
Published inForest products journal Vol. 46; no. 11/12; p. 73
Main Authors Leamaster, R.L. (North Carolina State University, Raleigh, NC.), Beall, F.C
Format Journal Article
LanguageEnglish
Published Madison Forest Products Society 01.11.1996
Subjects
Composite materials
DEFAUT DU BOIS
DEFECTOS DE LA MADERA
Forest products industry
INSTRUMENT DE MESURE
INSTRUMENTOS DE MEDICION
Lasers
Manufacturing
Measurement techniques
MEDICION
MESURE
Moisture content
PANNEAU DE FIBRES
PROCESAMIENTO
Process planning
Product quality
Quality control
RADIACION LASER
RAYONNEMENT LASER
Signal processing
Studies
TABLEROS DE FIBRA
Topography
TRAITEMENT
Wood composites
Wood products
Online AccessGet full text

Cover

More Information
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
Bibliography:9716750
K50
ISSN:0015-7473
2376-9637