Page 1
Page 2
Page 3
Page 4
Page 5
Page 6
Page 7
Page 8
Page 9
Page 10
Page 11
Page 12
Page 13
Page 14
Page 15
Page 16
Page 17
Page 18
Page 19
Page 20
Page 21
Page 22
Page 23
Page 24
Page 25
Page 26
Page 27
Page 28
Page 29
Page 30
Page 31
Page 32
Page 33
Page 34
Page 35
Page 36
Page 37
Page 38
Page 39
Page 40
Page 41
Page 42
Page 43
Page 44
Page 45
Page 46
Page 47
Page 48
Page 49
Page 50
Page 51
Page 52
Page 53
Page 54
Page 55
Page 56
Page 57
Page 58
Page 59
Page 60
Page 61
Page 62
Page 63
Page 64
Page 65
Page 66
Page 67
Page 68
Page 69
Page 70
Page 71
Page 72
Page 73
Page 74
Page 75
Page 76
Page 77
Page 78
Page 79
Page 80
Page 81
Page 82
Page 83
Page 84
Page 85
Page 86
Page 87
Page 88
Page 89
Page 90
Page 91
Page 92
Page 93
Page 94
Page 95
Page 96
Page 97
Page 98
Page 99
Page 100
world pulppaper 91 in many cases poor trimming can account for as much as half of all the breaks so eliminating this problem becomes very important Figure 3. Self-cleaning cameras with waterproofing and high temperature ratings can be located in all break sensitive locations with minimal concern over image quality and maintenance issues. The most common locations on conventional paper machines producing newsprint and fine papers are trim squirts pick-up press section open draws first dryer section coater exit size press exit calender exit reel for turnups and winder for edge issues and inspection 6. non proprietary all system components including computers should be off- the-shelf mill maintainable allowing for easy upgrading and low cost ongoing maintenance. 7. Full web inspection integration using the same WMS cameras the system has to have the capability also performing detailed web inspection WIS defect detection complete with reel map display and classification of defects into various papermaking categories. This reel to wet-end single platform integration provides a powerful platform to allow rapid dry-end defect to its root cause detection right to the wet-end complete with defect image transfer capabilities and accurate same piece of paper synchronisation. 8. Mill-wide information system Mis integration provides event summary statistics highlights problem areas automatic tracking of downtime etc. and is typically performed most effectively using OPC data linking. All of the above is now possible with the latest WMS systems and offers such an improvement in performance that it can be justified to either partially or affecting their operation and causing breaks. In many cases poor trimming can account for as much as half of all the breaks so eliminating this problem becomes very important. In the press section the most common locations are the pick-up centre roll and last press. All open draws should be monitored. Viewing the sheet in the first dryer section is also important and particularly useful with unfelted uno-runs as this allows full cross direction viewing of the sheet. Coaters and size presses are always camera equipped due to their typically high break frequency. Calenders and the reel for turn-ups can also be problem areas. Winders can be equipped as well as other off-machine operations the most important one being off-machine coaters. resuLTs Breaks are typically classified as coming from either known or unknown sources. Breaks coming from known sources can usually be eliminated but it is for the unknown breaks that a WMS system is needed. Also it should be noted fully upgrade previous generation WMS and WIS systems that might only be two years old. Figure 3 shows a typical synchronised break event and how the cameras and lights look when placed in the press section. caMera aPPLicaTions For WeB MoniTorinG WMs anD WeB insPecTion Wis Cameras and light housing technology are available today that can stay clean for extended periods and can withstand very high temperatures. Due to their small size and mounting flexibility cameras and lighting can be installed in nearly any position on a paper machine pulp machine coater supercalender winder and many tissue converting lines. Figure 5 shows where cameras are typically located on a conventional paper machine. Figure 6 shows how both WMS and WIS cameras provide a means of fully monitoring the papermaking process through the winders to various converting operations. The trim squirt application is very useful in ensuring that trim nozzle build-up wear and plugging is not