Influence of the Composition on the Exploitation Properties of Combined Medium Density Fibreboards Manufactured with Coniferous Wood Residues

Year 2018, , 140 - 145, 20.12.2018

Viktor Savov , Petar Antov Nikolay Neykov

https://doi.org/10.26701/ems.443891

Cited By: 3

Abstract

One of the main
disadvantages of medium density fibreboards (MDF) in
comparison with particleboards is the higher price of the panels, due to the energy-intensive
defibration process.

Studies on the possibilities
for replacing some part of the wood fibre mass in the composition of MDF with
coniferous sawmill residues (shavings) obtained from bandsaw, are presented in
this article.
The experimental plan is designed using the McLean and
Anderson method for studying the properties of multi component systems in the
presence of constraints on the components. The
content of coniferous wood shavings varies up to 40%. The panels are
manufactured with a density of 720 kg.m^-3. The content of urea-formaldehyde
resin varies from 8 to 14% in order to compensate the negative impact of the inclusion of
coniferous wood shavings in the composition of the manufactured MDF panels. The main exploitation properties of the panels are determined. Experimental and statistical models on the influence of the studied
factors are obtained by applying stepwise regression and optimization is
performed to obtain the best exploitation properties of MDF panels.

As a
result of the study it was determined that in order to achieve the values of
MDF properties, required by the respective standards, the maximum permissible
content of coniferous wood shavings should be up to 10.6%, in which case the
content of urea-formaldehyde resin should be above 10%. If the content of
urea-formaldehyde resin is below 10%, the
maximum permissible content of coniferous wood shavings should be up to 5%.

Keywords

medium-density fibreboards (MDF), wood fibre mass, coniferous wood residues

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