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Methods of wood particle size measurement - From the technological question to informative statistics
The description of ongoing research projects give you some examples of different applications of the Fibreshape system.
Burkhard Plinke, Dr. Arne Schirp, Inka Weidenmüller; Fraunhofer WKI, Braunschweig
Abstract: The size distribution of wood fibres
or particles as raw materials for fibreboards or particleboards is an
important parameter for the production control. Size characteristics are
currently measured using simple means such as sieve analysis which
provides only weight fractions. However, contour details (e.g. length,
width, aspect ratio of each particle) can de evaluated only by optical
measurements. Today, automatic image processing methods for laboratory
and on-line measurements are available which can be adapted to the
material type. Shape measurements for manually separated particles
together with weighted size distributions provide detailed information:
E.g. the different lengths of particles from various wood species which
originate from the same sieve fraction; the amount of shives and fibre
bundles in MDF fibre material corresponding to the gap size in the
refiner; different components (e.g. particles and fibres) in particle
mixtures. The FibreShape system operated at WKI is a helpful tool for
these investigations. In addition, using specific image processing
procedures which were developed at WKI, it is also possible to recover
and measure particle shapes in mat and board surfaces for a continuous
monitoring of particle geometry in the production.
Reference to the Paper:
Plinke,
B., Schirp, A. und Weidenmüller, I. (2011): Methoden der
Holzpartikelgrößenmessung - Von der technologischen Fragestellung zur
aussagefähigen Statistik. In: 9. Holzwerkstoffkolloquium, S. 177-187.
Institut für Holztechnologie, Dresden, 1.-2.12.2011.
Contact: Fraunhofer WKI, Burkhard Plinke
E-mail burkhard.plinke (at) wki.fraunhofer.de, Phone +49 531 2155 444