Patent ID: 8896826

Claim:
An inspection system for coated paper, comprising: a traveling path along which a web of paper travels; a coating device configured to form a plurality of bands on the web by applying a coating liquid in a width direction of the web such that the bands are spaced from each other in a longitudinal direction of the web at regular intervals; a drying device configured to dry the web having the bands formed thereon; a detection unit arranged downstream of said coating device and configured to detect at least either defect in any one of the bands or defect in the web that is caused due to application of the coating liquid to the web; a control device input with a detection result from said detection unit and including a determination section configured to determine a type of the defect from the detection result; and a quality control unit input with a determination result from the determination section and configured to manage the determination result; wherein said detection unit includes a first detection device arranged upstream of said drying device and configured to detect defect in any one of the bands; the first detection device includes a sensor configured to detect presence and absence of each of the bands, and a rotary encoder configured to output a signal at every inspection time when each of the bands is to pass the sensor; and the determination section judges that a severe defect has occurred if it is found based on outputs from the sensor and the rotary encoder that the bands are not formed at the regular intervals.