Sealing quality detection method
(1) On-line testing equipment for double crimping and sealing quality. There are two forms of online testing equipment for empty cans: one is negative pressure (i.e. vacuum
Detection method), the other is the positive pressure detection method. Negative pressure (vacuum) detection equipment is relatively simple.This kind of equipment has no detection sensors. It is only detected by whether the sealed open-top tank can maintain the vacuum formed in the interior.If the vacuum cannot be maintained for a certain period of time, open the The top tank will fall from the testing equipment by itself. Because the differential pressure of the negative pressure is small, small leaks often cannot be detected, and the reliability of the negative pressure detection method is poor. Positive pressure detection is to fill a certain pressure in the sealed container (generally no more than 0.8MPa), and a container pressure sensor is used to detect the tightness of the container by measuring the pressure change in the container. The effect of positive pressure detection is much more accurate and reliable than negative pressure detection. This method is used for spray tanks with high requirements.
(2) On-line testing of double crimping and sealing quality laboratory testing equipment for each tank, which is a comprehensive testing test for tightness
The detection in the room is random inspection, and there are certain rules for random inspection. The national standard GB / T14251-1993 makes general provisions on the detection rules. The quality of the crimp seal is mostly destructive. There are two methods for the quality random inspection of the curled seal structure: one is an indirect measurement method, that is, the body hook and the cover hook are cut off, the length of the body hook and the cover hook is measured with a caliper, the curl width is measured, and then the calculation formula Calculate the overlap rate; the other method is the direct measurement method, that is, cut the curled band, enlarge the cut section with a projector or a computer, directly measure the overlap length of the body hook and the cover hook, and then calculate the overlap rate. Of these two methods, the latter method is more accurate and intuitive and is the preferred detection method (arbitration method).