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Web turning air dryers

Innovative, energy efficient air dryers for contactless turning and drying of coated paper and board

OptiDry Turn air dryers are designed for drying the coated web and contactless turning the same time. Aided by patented air dryer nozzles, the dryers achieve uniform evaporation with minimum energy consumption, high efficiency and excellent runnability. We can prove you get the best paper quality and lowest energy consumption with Valmet air dryers. OptiDry Turn dryers enable shorter and compact layout with stable runnability and evaporation due to lack of free draws.

Coating drying is very energy demanding process and with air dryers it is possible to cut to half the energy costs of it. The energy efficiency of Valmet air dryers ranges from 70 to 90 % and respectively the energy efficiency of infrared dryers only from 30 to 40 %. So energy savings with air drying are 50 % or more compared to infrared drying. The OptiDry Turn air dryers are high efficiency coating dryers for all coated paper and board grades. They can be used for both, new machines and rebuilds.

Web turning air dryers

In the figure above: energy consumption and specific evaporation of OptiDry Coat compared to infrared dryers

There are basically two kind of OptiDry Turn air dryers with several applications:
• OptiDry Turn for double-sided drying suitable for all paper and board grades after sizer or coating station.
• OptiDry Turn for one-sided coated board drying to enable compact coating machine layouts

Drying with OptiDry air dryers gives excellent

  • energy efficiency
  • drying capacity
  • end product quality
  • runnability
  • easy and low cost maintenance
  • better working environment
  • less fire hazard
  • environmentally friendly approach

OptiDry Turn air dryers have shown their excellence in numerous references.

Main benefits of the OptiDry Turn air dryers

  • Minimizes water migration
  • Easy to operate using “Autoclearance” –feature
  • Reliable web tension indication
  • Enhanced drying capacity compared to conventional air turning
  • Low heat and humidity loads into machine hall
  • Space saving in rebuilds.