Product DescriptionProduct NumberMDF 6Brand NameTreezoMain
MaterialPoplarApplicationApartment, Furniture, Furniture
DecorationColorNaturalDesignModernMedium-density
fibreboard (MDF) is an engineered wood product made
by breaking down hardwood or softwood residuals
into wood fibres, often in a defibrator, combining
it with wax and a resin binder, and forming it
into panels by applying
high temperature and pressure.[1] MDF is
generally denser than plywood. It is made up of separated
fibres but can be used as a building material similar in
application to plywood. It is stronger and denser
than particle board.Physical propertiesOver time, the term
"MDF" has become a generic name for any dry-process fibre
board. MDF is typically made up of 82% wood fibre,
9% urea-formaldehyde resin glue, 8% water, and
1% paraffin wax.[4] The density is typically between 500
and 1,000 kg/m3 (31 and
62 lb/cu ft).[5] The range of density and
classification as light-, standard-, or high-density board is a
misnomer and confusing. The density of the board, when evaluated in
relation to the density of the fibre that goes into making the
panel, is important. A thick MDF panel at a density of
700-720 kg/m3 (44-45 lb/cu ft) may be
considered as high density in the case of softwood fibre panels,
whereas a panel of the same density made of hardwood fibres is not
regarded as so. The evolution of the various types of MDF has been
driven by differing need for specific
applications.In Australia and New Zealand, the main
species of tree used for MDF is plantation-grown radiata
pine, but a variety of other products have also been used,
including other woods, waste paper, and fibres. Where moisture
resistance is desired, a proportion of eucalypt species
may be used, making use of the endemic oil content of such
trees.Chip productionThe trees are debarked after being cut. The
bark can be sold for use in landscaping or used
as biomass fuel in on-site furnaces. The debarked
logs are sent to the MDF plant, where they go through
the chipping process. A typical disk chipper contains
four to 16 blades. Any resulting chips that are too large may be
rechipped; undersized chips may be used as fuel. The chips are then
washed and checked for defects. Chips may be stored in bulk, as a
reserve for manufacturing.Fibre productionCompared to other fibre
boards, such as Masonite, MDF is characterised by the next
part of the process, and how the fibres are processed as
individual, but intact, fibres and vessels, manufactured through a
dry process.The chips are then compacted into small plugs using a
screw feeder, heated for 30-120 seconds to soften
the lignin in the wood, then fed into
a defibrator. A typical defibrator consists of two
counter-rotating discs with grooves in their faces. Chips are fed
into the centre and are fed outwards between the discs by
centrifugal force. The decreasing size of the grooves gradually
separates the fibres, aided by the softened lignin between
them.From the defibrator, the pulp enters a blowline, a distinctive
part of the MDF process. This is an expanding circular pipeline,
initially 40 mm in diameter, increasing to 1500 mm. Wax is injected
in the first stage, which coats the fibres and is distributed
evenly by the turbulent movement of the fibres.
A urea-formaldehyde resin is then injected as the main
bonding agent. The wax improves moisture resistance and the resin
initially helps reduce clumping. The material dries quickly in the
final heated expansion chamber of the blowline and expands into a
fine, fluffy and lightweight fibre. This fibre may be used
immediately, or stored.Sheet formingDry fibre gets sucked into the
top of a "pendistor", which evenly distributes fibre into a uniform
mat below it, usually of 230-610 mm thickness. The mat is
precompressed and either sent straight to a continuous hot press or
cut into large sheets for a multiple-opening hot press. The hot
press activates the bonding resin and sets the strength and density
profile. The pressing cycle operates in stages, with the mat
thickness being first compressed to around 1.5 times the finished
board thickness, then compressed further in stages and held for a
short period. This gives a board profile with zones of increased
density, thus mechanical strength, near the two faces of the board
and a less dense core.After pressing, MDF is cooled in a star dryer
or cooling carousel, trimmed, and sanded. In certain applications,
boards are also laminated for extra strength.The
environmental impact of MDF has greatly improved over the
years.Today, many MDF boards are made from a variety of materials.
These include other woods, scrap, recycled paper, bamboo, carbon
fibres and polymers, forest thinnings, and sawmill off-cuts.As
manufacturers are being pressured to come up with greener products,
they have started testing and using nontoxic binders. New raw
materials are being
introduced. Straw and bamboo are becoming
popular fibres because they are a fast-growing, renewabl
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