多年来NKK致力于镀锡原板全板面缺陷漏磁通在线探伤法的研究，并取得不断进展。1988年开发出灵敏度比以前磁检测元件高100倍的高MGS一日元件，1991年以检测罐用原板擦伤为目的的缺陷检测装置成功实机化。随着制罐技术的进步，罐用材趋向减薄，研究工作向罐用材内部微小夹?.. Over the years NKK is committed to the original board full tin plate leakage flux leakage on-line detection of law, and made continuous progress. In 1988, we developed a high-MGS day unit with a sensitivity 100 times higher than that of the previous magnetic detection unit. In 1991, the defect detection unit for the purpose of scratching the original plate of the test tank was successfully realized. With the progress of canning technology, canning materials tend to be thinner, and the research work can be done within the can material.