| 摘要 |
A seal checker (1) capable of reliaialy detecting a faulty seal at a vertical seal portion of a packaging bag or a portion thereof covered by the vertical seal portion is provided. A lower transfer conveyor (12) conveys a packaging bag such that a vertical seal portion thereof moves along the conveyance direction. The upper (12) and lower (11) transfer conveyors sandwich and press the packaging bag therebetween. A servo motor detects the distance between the transfer conveyors (11,12) when the packaging bag is pressed thereby. A control unit determines the seal properties of the packaging bag based on the distance detected by the servo motor. A gap is provided on a conveyance surface of one of the transfer conveyors to which the vertical seal portion faces, which extends in the conveyance direction and prevents the vertical seal portion from being pressed.
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