保加利亚普罗夫迪夫罐头工业科研所研制出一种检测罐头密封的新方法。已知道,在罐头灭菌封盖以后,罐头里面是真空,不透气。而漏气的不合格罐头会有空气从盖里跑出。在自动生产线中,安装两种超灵敏度的传声器,它能够听出每个罐头的漏气情况。当仪器查出有“咝咝”响声的罐头,就取出重新进行密封。 Plovdiv, Bulgaria Canned Industrial Research Institute has developed a new method of testing cans. It is known that after the canister is capped and sealed, the inside of the can is vacuumed and is not breathable. The unqualified cans of air leaked air from the lid. In automated production lines, two super-sensitive microphones are installed that can detect the leaks in each can. When the instrument detects a can of sizzling can, remove it and reseal it.