|Technical Session 4: Improvements and Innovations - Efficiency Enhancing and Energy Saving Technologies
Energy savings from advances in tissue suction pressure roll venting
12 April 2017, 11:20 – 11:40
The suction pressure roll is the main dewatering element in tissue manufacturing. Developments in roll cover materials and press felt technologies have made it possible to use advanced techniques in roll cover venting that deliver unprecedented water removal and energy savings. Conservative approaches to venting have been used due to the critical nature of the suction pressure roll nip (high speeds, relatively high loads, soft roll covers, and mating the roll against the Yankee dryer).
Sophisticated algorithms can calculate the amount of water present in the nip and the available void volume. Through the proper use of suction through holes, double drilled suction holes, efficient blind drilling, and specially designed grooves, the components can be engineered to provide sufficient void volume in the suction roll nip. The benefits include increased water removal resulting in energy savings or increased production. Cross machine moisture profiles are also improved.
This presentation addresses the need for excess void volume, the amount required, and the need for open area in the suction pressure roll cover. The most effective suction pressure roll venting patterns will be presented, as well as case histories illustrating their efficiency,