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Compressed Air Encyclopedia

Air Knife
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An air knife creates a curtain of air using only a small amount of compressed air.

An air knife creates a curtain of air using the coanda effect. A small amount of compressed air is passed through a precise, slotted orifice. As the air exits the orifice, the surrounding air is pulled along with the compressed air. The compressed air and surrounding air combine to create a laminar sheet of airflow across the entire length of the air knife. The velocity of the air exiting the air knife is adjusted by regulating the input air pressure.

Air knives offer many advantages over open-pipe compressed air blow off. The cost of running an air knife is substantially lower since the air knife employs an amplification ratio of up to 40:1. This is the ratio of the compressed air input to the air knife output. Savings of between 40%-90% can be expected.

OSHA Considerations

The sound level of an air knife is only about 69 dBA, even when an input pressure of 80psi is used. This is well below the level that OSHA states is acceptable for workers to be exposed to for a full shift.

Static Elimination

For applications that require static elimination, a static dissipating air knife is available. At the discharge of the air knife, an ionizing bar fills the air stream with positive and negatively charged ions.

Air Knife Applications

  • Air Knife Cleaning Systems
    • Conveyor belt
    • Web
    • Dust blow-off before painting
  • Air Knife Drying Systems
    • Bottles and cans
    • Produce
  • Air Knife Cooling Systems
    • Molded components
    • Castings
  • Other
    • Bag opening (in fill applications)

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