b'MICROWAVE TECHNOLOGY APPLICATIONSFIXED MOUNTED PRESS FABRIC SCANNERS Water Content and energy consumption over time CASE STUDY 2, ELIMINATION OF VACUUM PUMP AND REDUCING OVERALL VACUUM LEVELSStudies have established that there is a fairly wide range of felt moistures that will not affect sheet moisture, whereas, above a certain limit, they will. In daily mill operation, the more is better theory often applies to vacuum application at uhle boxes, frequently resulting in excess vacuum, higher press section drive loads, and premature felt wear. At this crescent former mill, we installed 3 fixed moisture measuring heads (before the uhle boxes, between the 2 uhle boxes, and after the uhle boxes). See Fig. 7. There was a liquid ring pump supplying the pick-up roll and the 2nd uhle box, while a blower system supplied all other vacuum to the machine. Figure 8. Plot of energy and moisture vs. time showing erratic measurements during felt start up.Change in Moisture Content (Before NipAfter Uhle Box vs. Energy) Through these trials, we were able to redirect vacuum from the blower to the pick-up roll, and totally eliminate the liquid ring pump and the 2nd Figure 9. Energy Savings Possible by Controlling Felt Moisture. uhle box.72 WORLD PULP&PAPER'