Dryer screen design and materials are also very important. For a particular paper machine, the permeability, design and materials of the dryer screen should be adapted to make sure optimum drying from a drying section. The air permeability of the dryer screen has a great impact on the rate of evaporation of water. If the permeability is decreased, then it is reduction in drying capacity of the dryer screen. The dryer screen, whose air permeability range between 700-1000cfm is used on paper machine for producing higher gsm Kraft and board varieties. On the other hand 100-400cfm dryer screen widely used in medium and high speed paper machine, high numbers of contact areas with the drying surface ensure uniform drying. Proper chosen of dryer clothing improve paper machine runnability, increased drying rate, improved paper quality and savings energy.
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