Aerosol Cans & High Internal Pressure 40 Spray November 2015 What are the milestones in regards to internal pressure for aerosol cans especially filled with compressed gas? The risk of leakage is higher with high filling pressures, especially above 9.5 bar. For filling pressure at 8.5–9 bar the can specification, valve specification and clinching specification tolerances have to be reduced or at least the specification control system has to be reinforced. The clinching validation test will need to include all the packaging part variabilities, including the filling line (clinching and filling pressure). There is no option to fill flat shoulder rimmed cans (transfer cans) above 9 bar at 20°C. The milled bead is the most efficient option to avoid compressed gas leakage in aluminum cans with diameters equal or above 45mm. Wrapping up Within the aerosol industry, where safety has to remain the main priority, can sealing is a key operation. The quality of the final product is the result of all sectors involved. Strict methods and protocol validation, including all parts of the package (aerosol can, valve, gasket, crimping process), as well as filling and crimping parameters, are key to avoiding sealing problems. There is always room to improve business standards in order to improve quality. The future maximum internal pressure of 15 bar at 50°C (P50), following new European legislation for compressed gas used in non-flammable products, is an opportunity for the aerosol industry. It will help aerosols filled with compress gas ensure proper drainage. However, it will require further investigation of how to properly seal the aerosol can, as well as valve and can assembly design. It is probably time to think about a new generation of can sealing designs. Spray The business standards for a 1” opening with milled bead at 15°angle Franck Flecheux is a former R&D Director at a European can manufacturer. He has more than 30 years experience in the packaging industry, with 20 of those dedicated to aerosols, and involved in most new aerosol can development between 1996 and 2013. He is currently Director of Aerion Packaging & Conseil, which he founded in 2013. The firm’s main activity is to support the aerosol businesses worldwide, globally offering the services of an independent packaging expert specializing in aerosol container development and manufacturing; audit management; capability improvement programs; technical support; and customized training.
Spray November 2015
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