Influence of drying temperatures on the properties of paper from sulphate soft- and hardwood pulp

According to the latest studies, 24% of the currently available opportunities to reduce energy consumption in the production cycle of pulp and paper enterprises, as well R&D, are in the rebuild of design, technology and the correct configuration of equipment and related systems of the dryer part of the paper machine. Conducted thermotechnical studies suggest that in order to obtain the maximum productivity of the paper machine and minimize the specific heat consumption for drying paper, it is necessary to redistribute the cylinders into steam groups in accordance with the drying periods and ensure the redistribution of the steam flow across the cylinders according to the calculated steam flow. In this context, it seems reasonable to optimize drying temperatures, and there is a need for research on the effect of drying temperatures on paper properties. Therefore, the aim of this work was to study the effect of drying temperature on the strength and structural-dimensional properties of paper made from sulphate softwood and hardwood pulp. The analysis showed that an increase in the drying temperature from 80 to 140 ºС has the greatest effect on the growth of the structural and dimensional properties of paper made from a pulp with higher beating degree using both sulphate BHKP, BSKP and UBSKP as a raw material. At the same time, an increase in the drying temperature from 80 to 140 ºС has the greatest effect on the strength properties of paper (tensile strength, burst, tear) made from a pulp with lower beating degree when used as a raw material both BHKP and BSKP. Increasing the drying temperature from 80 to 140 ºС has a greater effect on the change in the structural and dimensional properties of paper, made from softwood compared to hardwood pulp, which is recommended to be considered when optimizing drying temperatures with the available fiber composition.

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