Most aerosols are filled with liquids. The usual markets for aerosols are personal hygiene, pharmaceuticals, automotive and the paint and lacquer industry. Aerosols are filled under pressure. Therefore the tin can packaging has an inner pressure. Besides the filling good it contains a propellant. When one presses the air valve, the propellant transports the filling good outwards as a (thin) vapour or aerosol, foam or powder.
So pressure requirement is the key for a can, it includes deform pressure and burst pressure. Burst pressure represents the mechanical strength limit of a metal tin can. Previously Sihai use thicker tins material to guarantee the pressure requirements.
With the improvement of our can-making production lines, we now can use thin thickness to produce same high pressure tin containers. Such as diameter 65mm, we adopted 0.21mm thick tins to produce 2Q cans.
The pressure test is particularly important for spray tin cans. So that we can prevent release or leaking during the filling process or even serious accident. For the burst test, a metal bottle filled with still water is pressurized relatively rapidly until an internal pressure of 13 bar has been attained and the pressure is maintained for 10 s. For Sihai products, our cans can attain 12 bar as deform and 14 bar at burst pressure at minmum.The pressure will get increased until the bottle bursts. The test log not only records the pressure at which the bottle bursts but also records where it bursts because it is important that the bottle fails at the sidewall and not at the bottom part.
Within the continuous improvement of our machines, we trust in near future, we will offer better products with high efficiency at competitive prices. For further information please contact us feel free.
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