Influence of dryer fabric on paper drying

造纸机由三个主要部件组成：成形部、压榨部和干燥部。虽然在造纸机中生产的纸的质量在很大程度上由成形部决定，但造纸机中使用的65%的能量以及造纸机的大部分资本成本与干燥部相关。在干燥部中，干燥织物将纸浆垫压靠在加热的干燥辊上以加速干燥过程;然而，纸浆垫上干燥织物的存在限制了水蒸气从垫的传质速率。由于降低的传质速率，与其它情况相比，需要更多的能量来干燥纸。建议的研究的主要目的是了解干燥机织物性能对造纸机干燥的作用，目的是优化干燥机织物的几何形状，以减少干燥过程所需的能量。

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.