Valmet impingement drying

Revolutionary drying technology for effective drying

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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.

Different solutions for replacing and improving traditional cylinder drying

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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Learn more about our OptiDry impingement drying solutions

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.

Capacity increase for rebuilds

OptiDry Vertical is an impingement dryer, which increases drying capacity without adding machine length. It is installed under the existing dryer section. OptiDry Vertical suits all paper and board grades and can be use with any dryer section layout.

Curl control

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.

Read our latest customer success stories about Valmet impingement drying deliveries

Palm Aalen PM 5 – a sustainable investment for the next 50 years

Oct 19, 2022

PM 5 at the Papierfabrik Palm Aalen-Neukochen site in Germany is the world’s widest high-capacity containerboard line. It is an investment for the next 50 years and has been producing high-quality and sellable board since the start-up in July, 2021.

World’s best paper machine: UWF speed record 1,808 m/min - Zhanjiang Chenming PM 1

Sep 10, 2013

The Zhanjiang Chenming PM1 in China has been setting world speed records since it's start-up in 2011. Considering energy and raw material consumption / produced tonne it is also an economical and ecological paper machine.

The world’s best paper machine: UWF speed record of 1,808 m/min

Jul 2, 2013

On September 1, 2011, the world's largest and fastest woodfree-producing paper machine was started-up at the Zhanjiang Chenming mill in China. During its first operational year, it achieved on several occasions a new world speed record. In November 2012, the recorded speed was 1,808 m/min. During a 24-hour run, the 11.15-meter-wide PM 1 produced high quality printing paper at a basis weight of 70 g/m2.

Cartones Ponderosa strengthens its competitive advantage

Dec 7, 2012

Mexico’s leading producer of coated folding boxboard has invested in Valmet’s curtain coating and air impingement drying technology to improve board quality, lower costs and boost productivity.

Steinbeis PM 4 increases its production capacity

Jan 14, 2010

"We are very pleased with the fact that the OptiDry Vertical dryer achieved the guaranteed drying capacity so fast and that the start-up was so easy."

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.

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