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MATERIALS 57
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flowing of the binder on the board surfaces (impact of higher to other SA-bonded boards.
amount of the binder) or even the explosion of the board Both MOE and MOR (the difference is significant) values
sample after the press opening (impact of higher temperature). of WSSA samples are higher than those of WSSE samples,
These negative experiments, in details not described here, indicating a positive influence of the SA binder and its

resulted in the selection of optimal pressing parameters for compatibility with wheat straw particles.
SA boards described in details above. The previous study on particleboards composed of birch
wood particles bonded by the SA binder reported MOE values
Bending Properties Of The Investigated Particleboards in the range of 1645–2772 N/mm2 and MOR of 8.7–18.7 N/
The bending properties of the investigated particleboards are mm2.
summarised in this study. MOE values of the boards vary This means that during this study the bending properties
in the range of 3720–9980 N/mm2, while MOR values vary of SA boards were significantly increased to a great extent
within 18–66 N/mm2. due to the higher density (850–1000 kg/m3 vs. 1170–1245
The minimum and maximum of both MOE and MOR kg/m3, respectively).

values achieved belong to the SE boards. Both MOE and It is worth noting that the content of the SA binder was
MOR values of the SE boards from wood (GA and SW) are decreased to 16 percent during this study (vs. 20%–30%
significantly higher than those obtained from wheat straw by in the previous study) because of the higher density of the
both pressing types. boards, which was not able to penetrate the higher content
Due to the high standard deviation, there is no significant of the SA binder.
difference in MOE values between the WSSE samples, depending According to EN 312 specifications for the particleboards for
on the pressing type. However, WSSE board samples hot- use in a humid environment, the MOE and MOR values should

pressed by the conventional type achieved significantly higher achieve at least 2050 N/mm2 and 15 N/mm2, respectively.
results of MOR compared to the samples obtained by the Our results show that the requirements for both bending
mould pressing. properties were achieved in all produced particleboards,
The studies performed before on WSSE and GASE with exceeding the values from 1.8× to 4.9× in the case of MOE
different conditions by conventional hot-pressing reported values and from 1.2× to 4.4× in the case of MOR.
for MOE of 3400–4640 N/mm2 and 6260–7260 N/mm2, and The most essential property of wood-based panels
for MOR of 20–28 N/mm2 and 27–32 N/mm2, respectively. characterising adhesion between the particles is internal
This means that the bending properties of WSSE remain bonding (IB). The IB values vary significantly from 0.44 N/
at the same degree regardless of the manufacturing condition mm2 to 3.04 N/mm2 depending on all the variables.

differences; however, both MOE and MOR of GASE boards The lowest IB values were achieved by the boards from WS
were significantly increased during this study.
As a result, the bending properties of GASE boards were
improved by separation of the soluble fraction after the SE sustainability-directory.com
processing even with reduced pressing time.
Between the samples bonded by SA binder, there is no
significant difference in both MOE and MOR values regardless

of the LCB species and pressing type used. Only the SWSA-M
sample achieved a significantly lower MOR value compared