How Do Air Knives Work? Discover Out Here

Air Knives are simple and very successful devices for drying and cleaning products. An works on the high intensity, uniform sheet of air that is used to effectively:

  • Eliminate liquids
  • Get a handle on the thickness of liquids
  • Dry liquid coatings
  • Remove foreign particles
  • Cool product surfaces
  • Create a store down force to help in the mechanical bonding of materials to the outer lining

Air Knives are often the most efficient and effective method of removing or controlling foreign substances for almost any surface. Most Air Knives are fixed with services and products moving through them on a conveyor however additionally there are systems where the product is stationery and the Air Knives move it. The potential that Air Knives provide for many different kinds of industries is therefore enormous.

An industrial air knife is really a pressurized air plenum with a continuous slot by which pressurised air exits in a laminar (uniform) flow pattern. The exit air velocity creates an impact air velocity onto the top of whatever product the air is directed to. This impact air velocity can range between a mild breeze to higher than Mach 0.6 = 454 mph = 731 kph = 40,000 fpm = 203 m/sec. Therefore an air knife alters the top of something without mechanical contact.

Air knives on a creation line usually range between 100 to 3048 mm (4 to 120 inches) in total with a discharge air slot including 0.40 to 2.0mm (0.015 to 0.08 inches). A stationary air knife configuration can require from someone to ten or more air knives depending on the application criteria. Air is blasted through the air knife slots with a high speed centrifugal blower to deliver the predetermined exit air volume and velocity needed. Electrical currents from anti-static bars can be injected into the exit air knife stream to neutralize the fixed electricity demand on some surfaces.