Abstract
The influence of pulping temperature in the range between 140°C and 175°C on the yield of water extractives of thermo-mechanical pulps (TMP) and the content of carbohydrates therein was assessed. The results reveal that the yield of extractives increases significantly with increasing temperature during thermo-mechanical pulping, especially in the temperature range between 160°C and 175°C. The degradation leads to the formation of low molecular carbohydrates in the cold water extracts of TMP. Increase in the amount of cellobiose with increasing temperature also indicates that some degradation of the cellulose during thermo-mechanical pulping takes place at high temperature.
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