DETECTION METHOD OF FLAW LOG AND FLAW LOG DETECTOR

摘要

PROBLEM TO BE SOLVED: To provide a method for precisely detecting the flaw represented by the defect, tear, doubling, etc. of raw paper without being affected by irregular reflection or the like to certainly detect flaw log in which the flaw is present, and to provide a flaw log detector.;SOLUTION: The raw paper running on the vacuum roll provided in the front stage of a winder is irradiated with high-frequency illumination and a predetermined position of the irradiated part of the raw paper is linearly and continuously photographed along the width direction of the raw paper by a high-speed camera. This photographed linear raw paper image is captured by an image processor and successively and continuously synthesized in the photographing order to form a raw paper image and the flaw of the raw paper is detected on the basis of the synthesized raw paper image.;COPYRIGHT: (C)2008,JPO&INPIT