Abstract
The internal temperature of wet sheets were measured by embedding a hair like thermojunction into pulp sheets.Above around 30% moisture content, the internal temperature indicated unexpectedly low constant values, i, e, about 40 to 70°C, corresponding to hot drying temperatures 100 to 170°C.As the moisture content decreases below 30% by drying, the internal temperature begins to rise and finally attains the same value as the drying temperature.This result might indicate that the water in the sheet consists of two kinds, one is the free water and the other is the fixed water. The above phenomena are supposed to be correlated with the anomalies observed in the shrinkagemoisture content curve and the densitymoisture content curve.
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