Wspólnotowy Serwis Informacyjny Badan i Rozwoju - CORDIS

Application of fibres from recycled paper and/or old paperboards in new gypsum-fibre boards

Evaluation of reuse of old paperboards on the quality of the new gypsum-fibre board.
The quality features of an old newspaper grade typical of Southern Europe were determined in terms of its physical properties after dry and wet pulping. In addition, the properties of the paperboard part of old gypsum boards and wet-pulped old newspapers were studied for refining-induced changes in their fibre morphology and strength properties.
- Fibrous material has to be sufficiently disintegrated to distribute the fibres uniformly throughout the gypsum substrate.
- Drainage resistance (SR) increases with the disintegration time owing to fibre swelling phenomena.
- Pulp refining is intended to enlarge the specific fibre surface via fibrillation and to activate the reactive OH groups. An increase in the specific refining energy brings about the following changes to the fibre properties: increased water retention (WRV) of the pulp and increased drainage resistance (SR) on the wire, enhanced tensile strength and elastic modulus (Young's modulus).
- Dry-pulped newspaper exhibited the highest short-fibre content (> 0.5mm). Reused gypsum paperboard exhibited the highest length-weighted average fibre length (1.17mm) among all samples tested.

Another important result of the project was that finely ground zeolite integrated into gypsum plasterboard was found to be capable of taking up formaldehyde and benzene - both are tobacco smoke emissions - thus removing them from the ambient air. In co-operation with KNAUF.GIPS, the PTS pilot paper machine successfully produced plasterboard samples containing 30% by weight of zeolite of different origins. These highly filled papers had greater pore volume and enhanced air permeability. The plasterboard (paper covering) therefore no longer acted as a barrier layer, but actively contributed to improving air quality.

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