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Comparison of the Optical Properties of Radiata Pine Tmp and Ctmp Pulps and the Starting Wood

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The reflectivity, specific light scattering coefficients and specific light absorption coefficients of earlywood and latewood in each ring from three radiata pine discs were determined at 457 nm. Significant ring-to-ring and within-ring variation was observed. A method was developed to determine the light absorption spectra of the wood. Comparison with that of TMP pulp showed that during refining a chromophore with a maximum absorption at 430 nm was produced. It is suggested that this is the same chromophore as that produced during light-induced yellowing of mechanical pulps, possibly an o-quinone. Chromophore formation was less when sulfite was present.

Affiliations: 1: PAPRO-New Zealand, NZ Forest Research Institute Ltd, Private Bag 3020, Rotorua, New Zealand


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