The effects of hernicellulose and lights on recycled pulp quality were studeid using hemlock pulps. The amount of pentosans in the pulps played a critical role in their recycling potential, with pulp recyclability improving with higher pentosan content. This effect was observed in both low-yield chemical pulps and ultrahigh-yield chemimechanical pulps. For five pulp properties (apparent density, tensile strength, burst strength, tear resistance, and light-scattering coefficient), the magnitude of changes induced by recycling can be statistically explained by the variation of pentosan content alone. Lignin content did not significantly affect the recycling potential of these pulps. A mechanism is proposed to explain how xylan molecules could influence pulp recyclability. Application: Demonstrates that pulp hemicellulose content - principally pentosans and especially xylan - governs the strength and optical properties of recycled pulps.
|Original language||English (US)|
|Number of pages||9|
|Specialist publication||Tappi journal|
|State||Published - Dec 1998|