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Even small improvements in the paper machine often bring significant savings. A recent Heimbach TASK case demonstrated improvements in productivity machine efficiency and resource conservation. In this particular case attention was paid to the hood ventilation in the dryer section the section of the paper machine that is frequently but mistakenly neglected. Approximately 65 of the energy in the paper machine is consumed in the dryer Section reason enough to take a closer look and uncover potential savings. In the case in question the Heimbach TASK team was called by a customer who was experiencing problems with sheet edge lifting in the dryer section. We conducted measurements throughout the entire dryer section and the hood ventilation and analysed the results from which initial changes were derived and implemented. This brought the customer immediate energy savings said Thomas Fischer Head of TASK describing the process. JOiNiNg fOrceS TO reach The TargeT The machine supplier was also brought on board to check the settings on the sheet stabilisers. As usual our experts worked in close cooperation with the supplier for the good of the customer by investigating possible causes said Thomas Fischer. These investigations did not impair the normal operation of the paper machine producing newsprint at 1600 mmin. DrYiNg SecTiON By Thomas fischer Heimbach GmbH Co.KG world pulppaper70 Savings potential in dryer section is more than just hot air The following investigations were performed Complete analysis of the drying section Heimbach TASK Measurement of the supply circulation and exhaust air flows of the hood Heimbach TASK Creation of a hood balance Heimbach TASK Monitoring and reviewing of the sheet stabilisers machine supplier The general situation in the dryer section based on the water content of the pocket air see info box was good but the measurements showed the following shortcomings in detail Suboptimal ventilation of the pockets almost all of the fresh air supply is used to stabilise the sheet and is NOT available as pocket ventilation and the removal of air laden with water from the pockets was therefore too low. High humidity means low drying under these conditions. The channeling structure for different air flows is much too complicated with unnecessary branches and long air paths resulting in loss of energy. The last door of the dryer section must be left open during production otherwise droplets form in the hood. This generates an additional volume of exhaust air. The temperature difference between the dry air and the dew point is a measure of the ability of the air in the pockets to absorb water figure 1.