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TECHNOLOGY 41
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can impact the viscosity of the coating, which therefore affects density of the particle board may need to be individually
the dry film thickness on wood surfaces. tailored, as it largely determines its strength regarding various
In addition, the durability of the tested coating was mechanical properties, including MOR.
discovered to be better for spruce wood, demonstrating The MOE is also shown in the research. The trend is similar

that different wood species can influence the total life and to that observed for the MOR: as the recycled wood content
performance of the paint covering. increases, the MOE also increases. However, unlike the MOR
results, all variants met the standard for MOE.
Modulus Of Rupture & Modulus Of Elasticity For particleboard made from window frame particles
The results for MOR are presented. The MOR value was painted white, the highest MOE value was recorded for the
observed to increase with the amount of recycled content. variant made entirely from the alternative raw material at
When analysing the MOR results for the variant using 3032 N mm−2, which is lower than the reference value of
window frames with white paint, the highest MOR value was 3212 N mm−2.
recorded for the variant made entirely from recycled particles The lowest MOE value was observed in the panel where

at 14.5 N mm−2, which is slightly lower than the reference alternative particles accounted for 10 percent, with an MOE
variant at 15.3 N mm−2. of 2251 N mm−2.
The weakest performance was observed in the variant In the case of specimens made from window frames with
where recycled particles accounted for five parts by mass, clear lacquer, the highest MOE value was also recorded for
with an MOR value of 10.1 N mm−2. the variant made entirely from alternative particles, reaching
For the clear varnish wood, the highest MOR value was 3665 N mm−2, which exceeds the reference value.
achieved by the variant made entirely from recycled particles at Conversely, the lowest MOE was obtained in the variant

16.8 N mm−2, exceeding the reference value of 15.3 N mm−2. where the recycled raw material constituted 10 parts by mass,
The weakest performance in this category was seen in recording a value of 2241 N mm−2. Research confirms that
the variant containing 10 parts by mass of reclaimed wood, recycled wood can reduce parameters such as the MOE.
with an MOR value of 10.6 N mm−2. The lacquer increases Nevertheless, the results met the EN 312 standards.
the surface hardness of the particles, which can lead to an During the preparation of the particleboard, dust fractions
enhancement in the mechanical strength of the particleboards. can also form, for example, when mixing the raw material
Higher hardness can improve the MOR, as the lacquer with the adhesive. Studies confirm that the presence of dust
coating may serve as an additional protective layer, enhancing fractions in the core layer of the board can contribute to the
resistance to breaking. weakening of MOE parameters.

A similar study investigated the effect of density and
bonding on the properties of particleboard made from milled rawpixel.com
window frames, recording comparable MOR values for boards
with a density of 700 kg m−3 . Unfortunately, not all of the
produced variants met the MOR standard values.
The most promising results were observed in particleboards
made entirely from recycled material, and the highest values

were recorded for particles from lacquered window frames.
Depending on the origin of the raw material used, the