The influence of drying temperatures on the properties of paper from sulphate unbleached softwood

Abstract

Researches described in this article were carried out in laboratory as part of writing PhD thesis in Engineering Science. The importance and novelty have been confirmed by experienced engineers from leading manufacturers of equipment and advanced technologies in the field of pulp and paper industry. The process of drying paper and board consumes the largest amount of energy in paper and board machines. At the same time, it contributes to remove a small amount of moisture from the material, compared to dewatering on the forming and press sections. Therefore, in order to reduce heat costs, as well as increase the productivity of the paper machine, it seems appropriate to intensify the drying process with minimal energy consumption and maintaining the key technological properties of paper. The goal of the study was to get paper samples of different basis weights, made from industrial sulfate unbleached softwood pulp, refined in laboratory on a conical refiner till defined grinding degrees, then forming and followed by drying at different temperatures. Analysis of the drying temperatures on the structural-dimensional and deformation-strength properties of paper made it possible to identify tendencies that can be used in further scientific researches, as well as directly introduce them into production. Rebuilds intended for reducing energy consumption, as well as optimizing and finetuning the technological modes of paper drying are one of the promising areas for upgrading production lines and increasing the competitiveness of domestic and foreign enterprises in current times.