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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:	Refereed Article
Keywords:	wood resins, tensile strength, Pinus radiata extractives, recycling process water, dissolved organics, fixatives, calcium salts
Research Division:	Chemical Sciences
Research Group:	Physical Chemistry (incl. Structural)
Research Field:	Colloid and Surface Chemistry
Objective Division:	Manufacturing
Objective Group:	Wood, Wood Products and Paper
Objective Field:	Pulp and Paper
Author:	Stack, K (Dr Karen Stack)
Author:	Zhang, J (Miss Jingyi Zhang)
Author:	Hodgson, M (Dr Michael Hodgson)
Author:	Lewis, T (Dr Trevor Lewis)
ID Code:	79786
Year Published:	2012
Web of Science® Times Cited:	2
Deposited By:	Chemistry
Deposited On:	2012-10-03
Last Modified:	2017-10-25
Downloads:	252 View Download Statistics