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Effect of increased levels of dissolved and colloidal substances from Pinus radiata on newsprint paper strength

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Stack, KR and Zhang, J and Hodgson, M and Lewis, T and Richardson, DE (2012) Effect of increased levels of dissolved and colloidal substances from Pinus radiata on newsprint paper strength. Appita Journal, 65 (4). pp. 331-336. ISSN 1038-6807

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Official URL: http://www.appita.com.au

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
Keywords: Wood resins, tensile strength, Pinus radiata extractives, recycling process water, dissolved organics, fixatives, calcium salts
Journal or Publication Title: Appita Journal
Page Range: pp. 331-336
ISSN: 1038-6807
Additional Information: Copyright 2012 Appita Journal
Date Deposited: 16 Oct 2012 05:12
Last Modified: 18 Nov 2014 04:43
URI: http://eprints.utas.edu.au/id/eprint/15144
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