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TECHNOLOGY 43
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and, as the proportion of alternative raw material increased, density of the starting raw material or internal bond quality;
the water absorption decreased, and for 100 percent, WA the weaker the WA, the denser the bulk of the particleboard.
significantly decreased to 75.5 percent. After 24 h, for the As the proportion of recycled wood increases, the swelling
variant with zero percent alternative raw material, the water decreases. After 2 h, for the variant with 0 percent alternative

absorption is 94.1 percent. raw material, the thickness swelling was 35.2 percent. For the
As the proportion of alternative raw material increases, the variant with 100 percent alternative raw material, TS increased
water absorption decreases to 87.1 percent with 100 percent to 39.3 percent.
alternative raw material. For samples made from white-painted Thickness swelling after 24 h for the variant with 0 percent
window frames, water absorption (WA) after 2 h was 87.4 alternative raw material is 42.2 percent. As the proportion
percent for the variant with 0 percent alternative raw material. of alternative raw material increases, the thickness swelling
As the proportion of alternative raw materials increased, decreases, reaching 30.8 percent with 100 percent alternative
water absorption gradually decreased. For the variant with 5 raw material (clear varnish).
percent alternative raw material, WA dropped to 84.4 percent. After two h, the thickness swelling for samples made

This trend continued, reaching 78.8 percent with 25 percent from white-painted window frames was 35.2 percent for the
alternative raw materials. At 50 percent alternative raw material, variant with 0 percent alternative raw material. The introduction
WA was 80.3 percent, and at 100 percent alternative raw of alternative raw materials led to an increase in swelling,
material, it decreased to 72 percent. reaching 47.6 percent for the variant with 5 percent alternative
For the variant with 0 percent alternative raw material, water raw material.
absorption after 24 h is 94.1 percent. As the proportion of Swelling then decreased with higher proportions of
alternative raw materials increases, water absorption decreases. alternative raw material, reaching 43.1 percent at 10 percent,

At 5 percent alternative raw material, WA drops to 76.5 36.8 percent at 25 percent, and 33.5 percent at 50 percent.
percent. This trend continues, with WA reaching 90.6 percent For the variant with 100 percent alternative raw material, the
at 10 percent alternative raw material and 89.5 percent at 25 thickness swelling was 28.9 percent. For the variant with 0
percent. At 50 percent alternative raw material, WA is 87.1 percent alternative raw material, thickness swelling after 24
percent, and it slightly decreases to 85.7 percent at 100 h is 42.2 percent. The addition of alternative raw material
percent alternative raw material.
The clear varnish penetrated deeper into the wood,
covering more of the wood surface. This deeper penetration Buy Insulation Online
likely contributed to the improved dimensional stability by

reducing water absorption.
The lacquer reduces the particles’ ability to absorb water,
which in turn reduces the risk of swelling and weakening of the
structure due to moisture exposure. White paint contains fillers
that may be more susceptible to moisture than clear lacquer.
A similar situation was obtained when testing particleboards
made from other particleboards, where the WA also decreased

as the proportion of recycled wood particles increased. Factors
influencing WA were also identified; these include the bulk