| Summary: | Recently, it has become more and more important to minimize
environmental pollution. As an attempt to alleviate the environmental problems in
materials, new wood based materials without any adhesives and binders have been
investigated. Optimizing of petung bamboo waste can be achieved by
manufacturing binderless particleboard. Binderless particleboard has been
considerable interest in issues regarding the negative side effect of synthetic glues
on the environment. This research was designed to analyze their physical and
mechanical properties and evaluate the various manufacturing conditions: pretreatment
(boiling), pressing temperature and pressing time. The other objectives
are to know the alteration of cell properties and the degradation of chemical
composition.
Binderless particleboards were manufactured from petung bamboo waste
(Dendrocalamus asper Backer) by hot pressing process. This study was
conducted using Completely Randomized Design into factorial by three
conditions: pre-treatment (boiling), pressing temperature (180ºC, 200ºC and
220ºC) and pressing time (10 minutes and 15 minutes). The board properties were
evaluated by JIS A 5908-1994 (type-8) as follows: density, moisture content,
water absorption, thickness swelling, internal bonding, modulus of rupture, and
modulus of elasticity. Chemical analyzes were extractive content, holocelluloses
content, α-celluloses content, hemicelluloses content and lignin content.
The result showed that single factor pressing time was affected on all of
physical properties of binderless particleboard. Degradation of chemical
composition occurs during the hot pressing process which affected on cell
properties changing. The best properties of binderless particleboard was obtained
at 15 minutes highest pressing temperature (220ºC) on particles without boiling,
which have density 0,59 g/cm³, moisture content 5,96%, water absorption 34,32%,
thickness swelling 2,06%.
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