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Rotary Blowers for Air Knives


Air knives are used for product drying, cleaning, cooling, etc. and these systems can be found in most manufacturing and packaging plants. These applications require high air velocities but not high pressure. It is common that compressors are used for these process applications and these misapplications of compressed air are opportunities to realize significant energy savings. This is because energy is required to compress air to pressures of 80-110 psig before it is stored, dried and filtered. A blower is only pressurizing the air to 3-6 psig (this is to overcome friction losses in the supply piping and through the air knife orifice) and does not require storage. Most applications do not require further drying of the air because of the low compression ratios. This is why substantial energy savings can be achieved by replacing air knife processes that utilize compressed air with blower supplied air. For a given process the flow rate will be constant. A centralized low pressure air system may require varying flows as production lines are turned on and off. Processes include:

Food packaging industry:

  1. Drying trays, cans and bottles
  2. Removing over-fill and spillage
  3. Cooling hot fill packages and shrink wrapped products
  4. Spraying food dyes.

Bottling Plants: 

  1. Can and bottle drying
  2. PET bottles
  3. Glass bottles
  4. Soda cans
  5. Wine bottles.

Metal Forming:

  1. Drying or lubricant removal
  2. Descaling, cleaning
  3. Cooling for cold rolling, coating, galvanizing, plating, roll forming

Foundries and Casting Plants:

  1. Cleaning sand-filled molds
  2. Cooling product

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