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Waste paper–wood composites bonded with isocyanate

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Abstract

Waste paper could potentially be used as raw material for fiber- or particle-based composites without resorting, deinking and decontamination required for paper manufacturing. The objective of this study was the evaluation of one-layer boards made of various ratios (0:100,15:85, 25:75, 50:50, 75:25 and 100:0) of waste paper flakes to wood particles mixtures (wt:wt). Three types of waste paper (newspaper, office paper and magazine paper) in pure form or mixed all together were used for board manufacture. PMDI resin at three different levels of 5, 8 and 10% without or with the addition of various amounts of wax (0.7, 1.0, 1.5 and 2.0%) were applied. The participation of waste paper flakes in boards made their appearance more attractive than ordinary particleboards and fiberboards made of wood. In contrast to internal bond, screw-holding strength and thickness swelling, properties that deteriorated substantially as the waste paper percentage increased, the bending strength was only slightly affected. By increasing the resin content all properties of boards and particularly internal bond and thickness swelling were improved. The addition of wax reduced considerably the thickness swelling of boards containing waste paper; however, even at a 2.0% level, it remained greater than the maximum permitted value specified by the relevant standard. Among the three types of waste paper tested, newspaper proved to be the most appropriate for board manufacture, and magazine paper the least appropriate. With the exception of screw-holding strength, the substitution of wood particles by mixed waste paper flakes in amounts up to 50% resulted in acceptable mechanical properties for specific applications in interior uses.

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Acknowledgements

Technical assistance by Dr. Georgios Ntalos and Mr. Constantinos Grigoriadis is greatly appreciated. The author also would like to thank Bayer AG, Leverkusen, Germany for providing the polymeric diisocyanate.

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  1. School of Forestry and Natural Environment, Aristotle University of Thessaloniki, 54006, Thessaloniki, Greece

    A. H. Grigoriou

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  1. A. H. Grigoriou
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Correspondence to A. H. Grigoriou.

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Grigoriou, A.H. Waste paper–wood composites bonded with isocyanate. Wood Sci Technol 37, 79–90 (2003). https://doi.org/10.1007/s00226-003-0164-x

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