| 摘要 |
PURPOSE: To provide a detector capable of stably detecting a film-cracked position in an edge part of a laminated film such as an extrusion laminated film or the like when it is detected, and especially even when a plastic film laminated on a base film is transparent. CONSTITUTION: A semiconductor laser beam source 11 emitting laser beams capable of penetrating an extrusion laminated film 6, and a photoelectric conversion element 12 which receives the laser beams and converts them to electric signals are respectively arranged on both end parts in a width direction of the extrusion laminated film 6 under a state wherein they are opposed to each other by putting the extrusion laminated film 6 between them between a manufacturing device for the extrusion laminated film 6 wherein a plastic film is laminated on a base film, and a trimmer 7 which cuts both end parts in a width direction of the manufactured extrusion laminated film 6, and shapes the film to a specified width. |
