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Abstract

The effect of increased levels of wood resins, salts and dissolved organics on newsprint tensile strength was
evaluated. Significantly more Pinus radiata wood resins are adsorbed onto the fibre surface compared to reported
results for Norwegian spruce. Differences in chemical composition may explain this. Tensile strength was found
to decrease significantly and reach a limiting value as the level of wood resins in the handsheets increased to
approximately 5 mg/g acetone extractives. High levels of calcium ions were found to cause precipitation of the wood
resins onto the fibre surface and also reduced tensile strength. Increasing amounts of soluble polysaccharides, such
as galactoglucomannans, were found to stabilize the wood resins in solution and reduce the amount adsorbed onto
the fibre surface, resulting in increased tensile strength. The addition of polymeric fixatives was found to reduce the
negative effect of the higher levels of extractives attached to the fibres.

Item Type:	Article
Authors/Creators:	Stack, KR and Zhang, J and Hodgson, M and Lewis, T and Richardson, DE
Keywords:	Wood resins, tensile strength, Pinus radiata extractives, recycling process water, dissolved organics, fixatives, calcium salts
Journal or Publication Title:	Appita J
ISSN:	1038-6807
Item Statistics:	View statistics for this item

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