How to test the tightness of tin metal cans?
The empty tank which has been cleaned can be dried by 35, and the pressure or pressure leak test shall be carried out according to the equipment condition of each unit. B.1 pressure leak test, the empty tank will be carefully injected into the water until eight or nine into full, the rubber ring will be placed in the appropriate plexiglass plate at the opening side of the roll, so that it can be sealed. Start the vacuum pump, turn off the bleeder valve, hold down the cover by hand, control the pumping, and make the vacuum gauge rise from 0Pa to 6.8X10 PA (510mmHg) for more than 1min, and keep the vacuum above 1min.
Pressure leakage test with a rubber plug when empty hole plugged, start the air compressor, slowly open the valve, the pressure in the tank is increased gradually, while the empty tank is immersed in the water tank, careful observation with outer bottom cover curling and welding seam has no air bubbles, until the pressure rose to 0.7jg/cm and 2min. All the same parts of continuous bubbles, should be judged as leakage, leakage of the recording time and pressure, and mark in the leak site on.
A careful observation of empty tank tank bottom edge and welding seam has no air bubbles, where the same parts of continuous bubbles, should be judged as leakage, leakage of the recording time and vacuum degree, and make a mark in the leak site.
