Air Knives are simple and highly efficient products for drying and cleaning products. An Air Knife System runs on the high intensity, uniform sheet of air that is used to effectively:
- Eliminate liquids
- Control the thickness of liquids
- Dried liquid coatings
- Remove foreign particles
- Cool product surfaces
- Create a hold down force to assist in the mechanical bonding of materials to the top
Air Knives are often the most efficient and effective method of removing or controlling foreign substances for almost any surface. Most Air Knives are stationary with services and products driving through them on a conveyor however additionally, there are systems where the item is stationery and the Air Knives maneuver around it. The potential that Air Knives
provide for many different varieties of industries is therefore enormous.
An industrial air knife is really a pressurized air plenum with a continuous slot through which pressurised air exits in a laminar (uniform) flow pattern. The exit air velocity creates an effect air velocity onto the surface of whatever product the air is directed to. This impact air velocity can vary from a gentle breeze to higher than Mach 0.6 = 454 mph = 731 kph = 40,000 fpm = 203 m/sec. Therefore an air knife alters the outer lining of a product without mechanical contact.
Air knives on a generation line usually vary from 100 to 3048 mm (4 to 120 inches) long with a discharge air slot including 0.40 to 2.0mm (0.015 to 0.08 inches). A fixed air knife configuration can require from someone to ten or even more air knives with regards to the application criteria. Air is blasted through the air knife slots via a high speed centrifugal blower to supply the predetermined exit air volume and velocity needed. Electrical currents from anti-static bars can be injected to the exit air knife stream to neutralize the static electricity demand on some surfaces.