Annals of Warsaw University of Life Sciences - SGGW

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5
4
Fiber direction - cross
Ra before mechanical w orking
Ra after Finishing treatment
Ra after mechanical w orking
Ra [μm]
3
2
1
0
Wood milling Sanding L1 - Thermomechanic
pressing
m echanical w orking
L2 - Thermomechanic
pressing
L3 - Thermomechanic
pressing
Fig.3: Mean arithmetic deviation of the profile Ra, by different mechanical surface treatment of wood
The 4-factor statistical scatter analysis of the measured Ra characteristics supports
the theories of Gáborík, Žitný (2007), Jourdain et al. (1999), Kúdela et al. (2004), Liptáková,
Kúdela (2000), Móza (2007) which claim that the anatomical direction influences quality of
wood surface (i.e. its roughness, too) to a great extent. The analysis also supported the theory
of Liptáková, Kúdela (2000) which compares milled, sanded, microtome- and hydroknifeprocessed
wood surfaces and proves that different surface processing has a significant impact
on the wood surface roughness. To broaden the spectrum, our study has focused on
comparison of milled, sanded and pressed surfaces.
From results of statistic evaluation it results, that on resultant roughness surface
making- up by water the diluting texture cloth has a very statistically prominent influence:
- interaction between the mechanical wrought and the direction of libriforming fibre,
- interaction between the mechanical wrought, type of the texture cloth and the
thickness texture film,
- interaction between the mechanical wrought of the surface wood, the texture cloth, the
thickness of texture film and the direction of wood fibres.
Thickness of the paint coating film H1
Coating P1
Coating P2
4
3,5
3
Ra [μm]
2,5
2
1,5
1
0,5
0
Wood milling Sanding L1 - Thermomechanic
pressing
L2 - Thermomechanic
pressing
L3 - Thermomechanic
pressing
m echanical w orking
Fig.4: Mean arithmetic deviation of the profile Ra (measured after finishing treatment), by different mechanical
surface treatment of wood for selected types of coating materials
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