Lights, Camera, Action!

With forward placement, when a system detects a defect, it signals the rewinder. “The rewinder slows and places the defect accurately in the repair area,” says Ernest Schneider, ­business development manager, ­Erhardt+Leimer. “When the operator is finished, he restarts the machine and the web continues to move forward.” Reverse placement, on the other hand, is used on rewinders that support reinspection. “In this mode, when a defect is detected and the signal is given, the machine stops and then reverses the web to the repair area where the defect is accurately [positioned],” says Schneider. “When the operator is finished and restarts the machine, the web moves forward to the inspction system where it is reinspected. If everything is okay, the machine returns to run speed. If there is still a defect present, the signal causes the machine to stop and reverse the web back to the repair area. This way, no defects can pass the inspection area undetected.”