(1) Double seaming quality online testing equipment Empty tank online testing equipment has two forms: one is negative pressure (vacuum) detection method, the other is the positive pressure detection method. Negative pressure (vacuum) detection equipment is relatively simple, this equipment does not have a detection sensor, only through the sealed open top can maintain the internal pre-formed vacuum degree to detect, such as in a certain period of time to maintain the vacuum degree, the open top tank will fall from the detection equipment. Because the pressure difference of negative pressure is small, small leakage can not be detected, and the reliability of negative pressure detection method is poor. Positive pressure detection is to fill a certain pressure (generally no more than 0.8MPa) in a sealed container, and test the tightness of the container by measuring the change of pressure in the container through a pressure sensor. The effect of positive pressure detection is much more accurate and reliable than that of negative pressure detection, and this method is used for the detection of spray cans with high requirements.

(2) Double seaming quality laboratory testing equipment online testing for each can testing, is a comprehensive sealing test.The inspection of the room is random inspection, and random inspection has certain rules. The national standard GB/T14251-1993 has made general provisions on the testing rules. Most of the laboratory tests on the sealing quality of the flange are destructive. There are two methods to spot check the quality of the sealing structure of the flange: one is indirect measurement, that is cutting the body hook and cover hook, measuring the length of the back hook and cover hook with a caliper, measuring the width of the flange, and then calculating the overlap rate through the formula; The other method is the direct measurement method,the roll side tape is cut, the incision section is amplified by the projector or computer, the overlap length of the body hook and the cover hook is directly measured, and then the overlap rate is calculated. Of these two methods, the latter method is more accurate and intuitive, and is the preferred detection method (arbitration method).