| 摘要 |
PROBLEM TO BE SOLVED: To stably practice irradiation of an electron beam suitable for improving metal strip characteristics without spoiling a production efficiency of a metal strip product.SOLUTION: A plurality of electron guns to irradiate an electron beam on the surface of a metal strip conveyed in order are arranged adjacently to each other with a space of a half or less of a scanning width of the electron beam and with the equal space in the width direction of the metal strip. A plurality of the electron guns share electron beam scanning to the surface of the metal strip in the width direction. When an electron gun among a plurality of the electron guns is unable to irradiate the electron beam, the scanning width of a normal electron gun adjacent to the unable electron gun is extended to the entire area of the electron beam scanning of the unable electron gun. A plurality of the electron guns except the unable gun thus share electron beam scanning to the surface of the metal strip in the width direction. |
