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MATERIALS 55
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out at 90 deg C for 30 min; after that, the suspension was Table. Types and conditions of produced particleboards.
cooled to 30 deg C and acidified with HNO3 to pH = 2.
LCB Board Type Hot-Pressing Temperature/Time* Designation
Then, the mixture was filtered in a polypropylene filter bag °C/min
with a fabric mesh size of 100 microns, rinsed with water, and Crushing + SE Conventional 160/20 WSSE

filtered again to separate water-soluble KNO3 and to obtain Mould WSSE-M
WS
SA-containing binder with a solid content of 20 percent. Milling + SA Conventional 180/20 WSSA
Mould WSSA-M
Production And Evaluation Of Particleboards Crushing + SE Conventional 160/20 GASE
Biobased particleboards were produced from LCB species using
Mould GASE-M
two manufacturing approaches: (1) binderless particleboards GA
Milling + SA Conventional 180/20 GASA
after SE treatment (SE-PB) and (2) milled particles bonded
Mould GASA-M
with SA binder (SA-PB).
Crushing + SE Conventional 165/20 SWSE
The SE boards were produced only from SE-pretreated
Mould SWSE-M
LCB based on a previous study. The SA boards were SW
Milling + SA Conventional 180/20 SWSA
produced based on a previous study using 16%–18% (o.d.)
of SA binder added to prepared LCB particles and mixed Mould SWSA-M
to achieve homogenous furnish, then dried to MC of 2% ± * The pressing time indicated here means holding in the press under
a certain pressure and includes nine minutes at the set temperature
0.2% before the hot-pressing. and cooling down to 90 deg C.
In addition to the conventional board type, the influence
of mould (M) hot-pressing was determined. In the case of The obtained PBs were characterised according to the

conventional pressing, the boards were produced with the relevant standards by density, modulus of elasticity (MOE),
measurements of 450 mm × 900 mm, from which another and modulus of rupture (MOR) in the three-point bending
four board samples were cut with the measurements of 200 test, with tensile strength perpendicular to the plane of the
mm × 400 mm. board (IB), and thickness swelling/water absorption (TS/WA)
The M-boards were hot-pressed in the specific mould after the immersion in water for 24 h.
made from aluminium alloy with the inner measurements of Mechanical tests (MOE, MOR, and IB) were performed on
200 mm × 400 mm. The boards were hot-pressed, slightly a ZWICK/Roell Z010 universal machine for testing resistance
varying the temperature and time to achieve the set thickness of materials.
of 9.5 mm and density of 1200 kg/cubic metre. The size of specimens was 200 mm × 50 mm for the

The pressing cycle for all board types consisted of two bending properties testing, and 50 mm × 50 mm for all other
general steps: (1) pressing under the set temperature for 9 properties testing. Six specimens were determined in each
min; and (2) cooling under a decreased pressure to achieve test to calculate an average value of each property.
the temperature of 90 deg C. The obtained board’s properties were compared with the
The pressing pressure in the first step varied within 10 European requirements EN 312 for particleboards for use in
± 2 MPa to achieve the set thickness of the board and was humid conditions (Type P3).
diminished by approximately 20 percent in the second step. The factors of the influence on the mean values of the tested

The type and conditions of produced particleboards are properties are analysed at the confidence level α = 0.05 by
summarised in the following Table. using the Excel software (version 2507) tool one-way ANOVA.