Study on the Possibility of Recycled-Banknote Utilization in the Production of Wood Gypsum Composite-boards

Document Type : Research Paper

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Abstract

This study was conducted to investigate the possibility of the utilization of defibrated-residual
currency bills in production of fiber reinforced gypsum boards. Three gypsum contents were
used, including: 1:2.5, 1:2.75 and 1:3 (wood: gypsum), based on dry weight of fibers.
Defibrated residuals were used in three levels namely 20, 30 and 40% based on their dry
weight. Two different types of boards were manufactured: homogeneous and three-layered
boards. Constructive gypsum powder was procured from Jabal-Gach Co. Thickness of all
boards was 16 mm and their density kept constant at 1 g/cm3. Specimens were prepared in
compliance with EN-312 for Physical and mechanical tests. Results showed that mechanical
properties generally decreased with more residual fiber contents. The bending strength was
significantly more in three-layered boards; however, internal bonding showed higher values
in homogeneous boards. Increase in gypsum content up-to resulted in higher mechanical
properties; higher gypsum content resulted in an increase only in the internal bonding values.
Higher residual fiber content resulted in a significant decrease in the water absorption and
thickness swelling. It may therefore be concluded that 2.75 is a suitable mixing proportion of
residual fiber composite-boards. Also, up to 30% of residual fiber can be recommended to be
used instead of wood-particles.

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References

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Iranian Journal of Wood and Paper Industries
Volume 4, Issue 1 - Serial Number 1
January 2012
Pages 87-99

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