WETTABILITY AND SURFACE ROUGHNESS CHARACTERISTICS OF MEDIUM DENSITY FIBERBOARD PANELS FROM RHODODENDRON RHODODENDRON PONTICUM BIOMASS

Mehmet Akgül, Süleyman Korkut, Osman Çamlıbel, Zeki Candan, Turgay Akbulut

Abstract


Wettability and surface roughness properties of medium density berboard (MDF) panels made
from Rhododendron biomass were examined in this study. Rhododendron dominates the understory
layer of the forests throughout the Black Sea Region in Turkey with substantial biomass potential.
is study was conducted to evaluate suitability of Rhododendron ber for MDF production.
For the experiments, rhododendron and commercially-manufactured-chip (Pinus sylvestris L.
and Quercus robur L.) with 11% moisture content were used. e mixing ratios of rhododendron
with commercially-manufactured-chip were 100:0, 75:25, 50:50, 25:75 and 0:100 %, respectively.
Commercial urea formaldehyde (UF) adhesive was used as a binder. A stylus method was employed
to evaluate the surface characteristics of the samples. Roughness measurements by the stylus method
were taken perpendicularly to the ber. ere was a signi cant di erence (p=0.05) between surface
roughness parameters (Ra, Rz, Rq, and Ry). e results obtained in this study revealed that all the
panels have met the general purpose-use requirements of European Norm (EN). It was found
that panels made with a 25/75 ratio of rhododendron to commercially-manufactured-chip had a
signi cantly lower contact angle (88.14o) than panels made with a 100/0 ratio (117.91o). Surface
roughness measurements are based on four roughness parameters, average roughness (Ra), mean
peak-to-valley height (Rz), root mean square roughness (Rq), and maximum peak-to-valley height
(Ry) were considered to evaluate the surface characteristics of the panels and supported the above
ndings as the panels made with a 25/75 ratio had a slightly rougher surface with average values of
2.929 m (Ra). From the tests performed, we conclude that increasing the rhododendron mixing
portion increased surface roughness and decreased wettability. Based on these results, rhododendron
biomass could be an alternative raw material for MDF manufacturing.

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