Influence of dryer fabric on paper drying

造纸机由三个主要部件组成：成型部分、压榨部分和烘干部分。虽然造纸机生产的纸张质量在很大程度上由成型部分决定，但造纸机所用能量的65%以及造纸机的大部分资本成本都与烘干机部分有关。在烘干部分，烘干织物将纸浆垫压在加热的烘干辊上以加速干燥过程；然而，烘干织物在纸浆垫上的存在限制了水蒸气从纸垫上的传质速率。由于传质速率降低，与其他情况相比，干燥纸张所需的能量更多。拟议研究的主要目标是了解烘干织物性能在造纸机干燥中的作用，目标是优化烘干织物的几何形状，以减少烘干过程所需的能量。

Papermachines are comprised of three major components: the forming section, the press section, and the dryer section. Although the quality of the paper produced in a papermachine is largely determined by the forming section, 65% of the energy used in a papermachine, and much of the capital cost of a papermachine, is associated with the dryer section. In the dryer section the dryer fabric presses the pulp mat against the heated drying rolls to accelerate the drying process; however, the presence of the dryer fabric on the pulp mat limits the mass transfer rate of water vapour from the mat. As a result of the reduced mass transfer rate, more energy is required to dry the paper than would otherwise be the case. The primary objective of the proposed research is to understand the role of dryer fabric properties on papermachine drying, with the goal of optimization of the dryer fabric geometry to reduce the amount of energy required for the drying process.