The Effect of Vermiculite Usage on Surface Properties of Medium Density Fibreboard
Abstract
In
this study, the effects of vermiculite of volcanic minerals usage on the
surface properties were investigated in medium density fiberboard (MDF)
production. The test boards were produced using the dry method with 12% urea
formaldehyde resin. Additions of 10%, 15%, 20% and 30% vermiculite were used
based on the full dry fiber weight. Surface roughness, color and gloss values
of both surfaces of the obtained boards were determined. Based on the results,
the ratio of vermiculite increased, roughness values on the surfaces increased.
The roughness values in the bottom surface of the produced boards were
determined to be higher than the top surface. With the use of 30% vermiculite,
the average minimum surface roughness (Ra) was found to be 8.65 μm on the upper
surfaces and 15.44 μm on the lower surfaces. It has been found that total color
change and brightness are improved by the increase of vermiculite usage and the
color change on the bottom surface is found higher. In short, the use of
vermiculite in the production of MDF negatively affects the surface roughness
and discoloration of the boards, but it has been found to positively affect the
gloss
Keywords
References
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