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Sequential treatment of mechanical and chemimechanical pulps with light and heat

Unbleached and peroxide bleached groundwood and chemimechanical pulps were subjected to sequential treatment with either light and heat or with heat and light. The color changes caused by each individual treatment as well as by the sequential treatments were evaluated. Difference reflectance spectra in UV-visible light (UVVIS) of the four pulps were obtained after a single treatment with light or heat of the pulps as well as after the total sequential treatments. In addition, the differences between the influence of light and heat as well as of the sequence order were elucidated by spectral analysis. For all four pulps the sequence light before heat was found to be much more detrimeatal to the optical properties in the visible region than heat before light. The effect of the sequential treatment of peroxide bleached groundwood was similar to that of peroxide bleached chemimechanical pulps.