Carter Holt Harvey Limited

Canterprise Limited

John Corrie Fleming Walker

Thomas Alan Clark

Ross Lindsay Dickson

Denis John Albert

A method of selecting bulk wood units for chemical pulping in alkaline conditions which consists of establishing a reference scale by selecting a test sample, measuring the acoustic velocity through each sample units, selecting acoustic velocity bands from the sample results, processing the sample units using known chemical pulping processes, measuring the percentage pulp yield, and then using the measured pulp yields and acoustic velocities to produce a reference scale; measuring the acoustic velocity through each of the units, comparing the velocity measurement for each unit against the reference scale, and then dividing the tested units into subgroups according to the predicted yield in chemical pulping.

Method of selecting wood for chemical pulping

The invention provides a method for predictively assessing one or more characteristics of wood pulp produced from solid wood. The method comprises the steps of determining the velocity of sound through the solid wood, and assessing characteristic(s) of wood fiber or wood pulp produced from the wood by reference to the velocity of sound through the solid wood. The method may also comprise the steps of causing a sound wave to be transmitted through the wood, determining the velocity of the sound wave through the wood, and comparing the result to stored information on fiber characteristic(s) versus sound velocity through the wood-type to determine the fiber characteristic(s) for the wood.

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Christchurch, New Zealand

John Corrie Fleming Walker