Automatic Inspection of Coated Paper at the Sheeter, 1990 Finishing and Converting Conference Proceedings

Please Note: This document will be available in PDF format in the "My Electronic Documents" link on the home page once your order has been completed. Please make sure you have the latest version of Acrobat Reader. Click on the Acrobat Reader icon to check for the latest version, it’s FREE. To print a hardcopy of a PDF file correctly you must have a postscript printer. If you are not sure if your printer is a postscript printer please refer to your owner’s manual.

Purchase of electronic (downloadable) documents made at www.tappi.org by credit cards, followed by instant download CANNOT be cancelled. We do not offer refunds on electronic download documents.

This report discusses the implementation of a system to automatically identify, map and reject defects on a coated paper product. The problems that would be detected include blisters, coating lumps, wrinkles, coating voids, spots, holes/tears, scratches and streaks. The system we will discuss shows how advances in machine vision have paved the way for reliable visual analysis of continuous flowing products. The basic techniques of automatic inspection machines are discussed, including the lighting, resolution, processing speed and accuracies that can be expected. These techniques are then applied to the coated paper problem. Also discussed are the system outputs which include regular alarms, mapping of the irregularities, which identifies the defect by size and position on the roll, and also reject signals to the sheeter reject mechanism to allow automatic removal of the defective sheets of paper.