3114 



Chapter 25 



DRY AIR 



POCKET VENTILATOR 



DRYER CYLINDER 



TOP POCKET 



PAPER WEB 



BOTTOM POCKET 

 POCKET VENTILATOR 



FRONT 



BACK 



LOCATION ACROSS SHEET WIDTH 



Figure 25-17. — Paper drying. (Top) Paper passes over heated drying rolls; backup felts 

 on top and bottom hold paper in contact with rolls. Pocket ventilators even out 

 variation in moisture content. (Bottom) Example of variation of moisture content 

 across width of paper sheet emerging from dryer. (Top drawing after Gardner 1966; 

 bottom drawing after Metcalfe 1968.) 



