Break monitoring system for web in papermaking machine

Application Number: 00102674
Application Date: 2000.02.25
Publication Number: 1264836
Publication Date: 2000.08.30
Priority Information: 1999/2/25 FI 990408
International: D21F7/04;G01N21/89
Applicant(s) Name: Hildeko Inc.
Inventor(s) Name: Mika Valkne;Juha Tuovone;Yoma Snelman
Patent Agency Code: 11038
Patent Agent: he tengyun
Abstract The invention relates to a monitoring system for web breaks in a paper machine. A web is monitored by means of a number of cameras and the image data of various camera positions is used for compiling focused image regions. Camera-specific image processing equipment is adapted to compile image change data by comparing the change between sequential images as far as the focused image region is concerned. The image change data is compared with a normal level of image change and an alarm message is delivered if the image change level has a deviation from the reference level which exceeds a preset threshold value. A break alarm is set off, in case said alarm message is delivered by image change data comparators of one or more pre-selected camera positions.