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Title
Influence of layer composition on the properties of recycled boards
Authors
Diana Gregor-Svetec
Received
August 11, 2009
Published
Volume 44 Issue 10 November-December
Keywords
board, recycled fibres, viscoelastic properties, mechanical properties, humidity
Abstract
In the present study, three types of recycled boards with different top layer composition have been analysed. The quality of coated boards with different fibrous composition has been evaluated by determining their structural, mechanical, optical and surface properties. The slight increase in virgin fibre content in the top layer, from 10 to 20%, has been found to improve the surface, the optical and mechanical properties of coated recycled boards. A greater influence on the mechanical properties is exerted by the addition of a higher percentage of chemical pulp in the top layer of the three-layered structure of recycled boards, rather than by the addition of a forth layer from recovered paper and board. Additionally, the investigation aimed at determining the viscoelastic properties of the boards and assessing the influence of a 90% relative humidity on their tensile properties. Besides lowering tensile strength, humidity has even a more significant influence on the viscoelastic properties. Of the coated recycled boards under study, the influence of humidity has been found as less pronounced in the boards containing higher amounts of chemical pulp in the top layer.
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