engleski

Factors influencing particle size distribution of oak and fir sawdust in circular sawing

Woodworking machines and cutting parameters, as well as processed material properties determine the particle size distribution of chipped wood and as a result also the emission of airborne wood particles at the workplace. The objective of this paper was to clarify the influence of feed speed, cutting angle and wood structure on particle size distribution of sawdust generated during sawing of solid fir-wood (Abies Alba Mill.) and oak-wood (Quercus Robur L.) with circular saw. In sawing at lower working table position (which means cutting nearly perpendicular to grain) the share of small particles in sawdust decreases with the increase of feed speed, and oak- sawdust contains more small particles than fir- sawdust. In sawing at higher working table position, i.e. cutting nearly along the grain, the influence of feed speed on particle size distribution is not quite clear but it seems that with increasing feed speed the share of small particles also increases. It is very interesting that there are more small chips in fir sawdust than in oak sawdust when cutting at upper working table position. More small particles are produced during circular saw cutting of solid wood with lower feed speed at low working table position than in cutting at high working table position in spite of smaller chip thickness. It could be concluded that the influence of the cutting angle is more significant than the influence of the average chip thickness.

sawdust ; fir-wood ; oak-wood ; particle size distribution

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