| 摘要 |
Wrapping material ( 2 ) supplied to a packaging machine is caused to advance along a predetermined feed path ( 3 ) through a first checking station ( 27 a) where an emitter device ( 29 ) charges at least one predetermined portion ( 30, 34 ) of the wrapping material ( 2 ) electrostatically, and a second checking station ( 27 b) where a sensor ( 31 ) detects the presence of the electrostatic charges applied previously to the predetermined portion ( 30, 34 ) of the material ( 2 ). The sensor ( 31 ) is positioned along the feed path ( 3 ) downstream of and at a predetermined distance from the emitter device ( 29 ).
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