Impingement drying is a very efficient way of drying the paper web that uses air as the drying medium. Effective drying is gained by blowing hot, high-velocity air onto the sheet and circulating the air back to the dryer. This method yields a considerably higher specific evaporation rate than conventional cylinder drying thus enabling shorter paper and board machines and machine rooms. The drying air is heated with gas providing flexibility for drying energy concepts.
OptiDry impingement drying technology has been developed both to replace and to improve traditional cylinder drying technology. It is the most effective way to dry paper. We have three impingement drying solutions offering different benefits for papermakers.
The revolutionary OptiDry Twin represents impingement drying technology that provides superior drying efficiency. Resulting in excellent runnability, enhanced draw control and increased bulk. OptiDry Vertical is the rebuild dryer increasing drying capacity without adding machine length. It is placed under the existing dryer section with minimal changes to current layout. OptiDry Curl offers energy efficient curl control for single felted dryer sections.
One example of the superior qualities of OptiDry impingement dryers is Zhanjiang Chenming PM 1 in China with OptiDry Twin and OptiDry Curl impingement dryers and world record speed.
Valmet impingement drying offers an advanced and sophisticated way to increase machine production, efficiency and end product quality, in an energy-efficient way, on both new and rebuilt paper or board machines.
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High efficiency drying
OptiDry Twin impingement dryer represent high technology drying, enabling up to 30 % fewer drying cylinders (and thus a shorter paper machine and machine room) and optimized runnability due to higher dry content before cylinder drying. It also provides tools for increasing sheet bulk.
OptiDry Curl, the new solution for curl control, is based on the impingement drying technology. Traditionally dryer groups with a double-felted configuration have been used for controlling the paper curl by adjusting different top/bottom dryer temperatures and affecting in this way drying on the two sides of the paper. Another traditionally used method is moisturizing (with water or steam), which also influences the curl of paper but at the same time increases paper moisture again.
How to plan a successful rebuild?
Rebuilding a paper or board machine can improve the competitiveness of your business and your processes. But where do you start? Download our e-book to learn how to develop a winning rebuild concept, how to minimize rebuild related risks, and how to ensure smooth ramp up to full production.Download e-book