Effects of site on fibre, kraft pulp and handsheet properties of Eucalyptus globulus

Abstract• Eight-year old trees from two Eucalyptus globulus Labill. clones planted across three different sites in Tasmania, Australia, were sampled for wood and kraft pulp/handsheet properties.• Site had a significant effect on all measured properties. Compared with the poor site (Parkham) the wood from the good site (West Ridgley) had on average 11 % lower wood density. The poor site had also greater microfibril angles, shorter fibres at lower pulp yields.• The handsheets produced with pulp from the poor site resulted in comparatively higher bulkiness, lower burst, lower tear and tensile indices, lower zero span tensile strength, but higher opacity, higher light scattering and higher surface roughness. Significant height effects were found with all wood properties, and also with tear index, zero span tensile strength and opacity.• Discriminant analysis showed that for 76 out of 100 handsheets the raw material source, i.e. growth site, could be predicted correctly using a set of handsheet properties with tear index and bulk index being most prominent.• This is unique evidence that site conditions are strongly reflected in handsheet properties produced from Eucalyptus pulp.Résumé• Nous avons échantillonné des arbres de huit ans de deux clones d’Eucalyptus globulus Labill., sur trois sites différents de Tasmanie en Australie, pour analyser les propriétés du bois et les propriétés papetières.• Le site a un effet significatif sur toutes les propriétés. Sur le meilleur site (West Ridgley), le bois a une densité inférieure de 11 % à celle obtenue sur le site le plus pauvre. Ce dernier (Parkham) présente un angle des microfibrilles plus important, des fibres plus courtes et un rendement en pâte plus faible.• Les feuilles fabriquées avec de la pâte du site pauvre conduisent à une main plus importante, un éclatement, une déchirure et des indices de traction moindres, une résistance à la traction à la mâchoire jointive plus faible, mais une opacité plus forte, une diffusion à la lumière et une rugosité de surface plus importantes.• Des effets significatifs de la hauteur ont été mis en évidence pour toutes les propriétés du bois mais aussi pour l’index de déchirement, pour la résistance à la traction à la mâchoire jointive et pour l’opacité. L’analyse discriminante a montré que pour 76 feuilles sur 100, l’origine de la matière première, c’est-à-dire le site de production, pouvait être prédite correctement en utilisant un jeu de propriétés des feuilles, l’indice de déchirement et la main étant les plus évidents.• Cela montre de manière originale que les conditions stationnelles sont reflétées dans les propriétés de feuilles de papiers produites avec de la pâte mécanique.

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