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Aerosol Filling Machine

Aerosols in Food and FMCG industry are the spray cans we use for various products. In Aerosol cans, usually the product is suspended in air or other gaseous environment (propellant), although, there are Aerosol cans where the product and the propellant are totally separate to each other (Bag on valve and Bag in Can technology). Product formulation, selection of valves, propellant type and process requirements play a very important part in Aerosols filling machine selection.

Aerosol Fillers usually fill products by any of the following methods 

  • Positive displacement type piston fillers
  • Time over Pressure Filling type
  • Gravity Filling
  • Gravity-time filling
  • Mass flow 
  • Net Weight Filling

Propellants are usually filled in the containers either by UTC (Under the cup) Filling technique OR by TTV method (through the valve filling).

Usually 2 different techniques are followed in aerosols formulation and filling. In the cold fill process, both the product concentrate and the propellant temperature is controlled and maintained so that they remain liquefied. The heavy vapors of the cold liquid propellant usually displace the air present in the container. When filling is complete, the valve assembly is inserted into the container and crimped into place. The container is then passed through a water bath of about 55°C to check for leaks or distortion in the container.

The other filling method usually employed is Pressure filling and that is carried out essentially at room temperature. The product concentrate is placed in the container, the valve assembly is inserted and crimped into place, and then the liquefied gas, under pressure, is added through the valve.

Liquefied gases (hydrocarbons, nitrogen etc.) are usually used as propellant in aerosol cans. In a two phase system, the concentrated product is dissolved or dispersed in propellant and solvents creating a homogenous mixture. The propellants exist in the vapor and liquefied phase. When the aerosol valve is actuated, the mixed product is emitted from the container.

In Bag on Valve OR Bag in Can technology, compressed gases are not in touch with the product and the propellant essentially acts as a pressure package. The pressure of the gas forces the product concentrate out of the container in the same form as it was placed in the container. Only the product concentrate is expelled in this case. The nature of the formulation, valve type and the type of compressed gas used determines the product may be dispensed as a semisolid (solid stream) foam or spray. Semisolid aerosols are used to dispense more viscous concentrates such as dental creams, hair dressings, ointments, creams, cosmetic creams, and foods.

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