Abstract: In a method of removing conductive balls that are left on a mask provided on a substrate having pads thereon, the method includes: (a) making a sheet member close to the mask using a contacting mechanism such that a gap between the sheet member and the mask is set small than a diameter of the conductive balls. The conductive balls are removed in such a manner that the conductive balls are adhered onto the sheet member.

Abstract: In a method of removing conductive balls that are left on a mask provided on a substrate having pads thereon, the method includes: (a) making a sheet member close to the mask using a contacting mechanism such that a gap between the sheet member and the mask is set small than a diameter of the conductive balls. The conductive balls are removed in such a manner that the conductive balls are adhered onto the sheet member.

Abstract: Method for sterilizing infectious waste water and a system thereof disclosed in the present invention comprise pump feeding step A, heating/sterilization step B, drainage step C, cleaning step D and vacuum suction step E. The pump feeding step A is a step wherein infectious waste water in a raw water tank is pumped to a tank body of a sterilization tank, the heating/sterilization step B is a step wherein infectious waste water pooled into the tank body is indirectly heated to sterilize the infectious waste water, the drainage step C is a step in which waste water treated by heating/sterilization is discharged from the tank body, the cleaning step D is a step in which after the drainage step, washing water is showered to clean the tank body.