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Comparison of the optical properties of radiata pine TMP and CTMP pulps and the starting wood

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Abstract

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 ano-quinone. Chromophore formation was less when sulfite was present.

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

    I. D. Suckling

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  1. I. D. Suckling
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Suckling, I.D. Comparison of the optical properties of radiata pine TMP and CTMP pulps and the starting wood. Res. Chem. Intermed. 21, 275–286 (1995). https://doi.org/10.1007/BF03052258

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  • DOI: https://doi.org/10.1007/BF03052258

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