Chemical Aspects of Photo-Yellowing of High-Yield Pulps
High-yield pulps such as TMP and CTMP turn yellowish on exposure to daylight (photo-induced yellowing) or heat in the presence of moisture (thermal yellowing). Whereas the latter type of yellowing may have an importance in e.g. the production process and in the paper machine, the former type predominantly occurs as a non-desirable process when the finished paper product is exposed to light. It has also been shown that the yellowing becomes more prominent when the brightness is high .
KeywordsAlkaline Hydrogen Peroxide Paper Machine Mechanical Pulp Light Absorption Maximum Important Chemical Change
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