Abstract
When paper is subjected to heat treatment at 180_??_200°C., the wet strength is remarkably increased, and other physical properties also change. In process of heating, the dry tensile and burst strength is increased and the tear strength reduced. The elongation of the wet paper is greater with prolonged heat treatment, but the irreversible elongation is increased only at the initial period of heating, and soon becomes almost constant. In comparison with the untreated paper, the dynamic Young's modulus of the heat treated paper is scarcely increased in dry condition, but is more or less increased in wet condition. The determination of the impact strength and the moisture expansivity show that the heat treated paper is very insensitive to the influence of water and moisture. The electrical puncture voltage of paper is increased and the power factor of it decreased with the time of heat treatment.
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