| 摘要 |
PROBLEM TO BE SOLVED: To provide a more effective dry sterilizing method for a preform. SOLUTION: When an internal surface 1a of the preform 1 comprising a cylindrical part 11 and a semispherical bottom 12 is sterilized by electron beams 3, the electron beams 3 are projected from an opening 13 at an end of the cylindrical part 11 of the preform 1 toward the inside of the preform 1. |
