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
SPRAY SYSTEMS WORLD PULPPAPER80 Precision Spray Control PSC involves turning nozzles on and off very quickly to control flow rate. This cycling is so fast that the flow often appears to be constant Figure 4. AutoJet Spray Controllers provide easy control of nozzles and cycle times up to 16000 cycles per minute Figure 3. Two PulsaJet Automatic Spray Nozzles mounted 12 305 mm from the roll are used at each end of the queen roll Results The AutoJet Modular Spray System provides a consistent coating of water on the queen roll. Mill operators have determined that the PulsaJet nozzles hydraulic flat spray pattern does a better job of wetting and cleaning the roll than the previously used air atomizing nozzles. In addition the systems alarm signal notifies operators of possible plugged nozzles enabling proactive maintenance to prevent sheet breaks. Prior to installing the system the mill experienced up to eight sheet breaks per month. After installing the AutoJet Modular Spray System the number of sheet breaks averaged just two per month. Using the mills estimated downtime expense of US10000 per sheet break the investment in the new spray system was recouped in less than two months. Precision Spray Control PSC involves turning nozzles on and off very quickly to control flow rate. This cycling is so fast that the flow often appears to be constant. With traditional nozzles flow rate adjustments require a change in liquid pressure which also changes the nozzles spray anglecoverage and drop size. With PSC pressure remains constant enabling flow rate changes without changes in spray performance. PSC requires the use of electrically- actuated spray nozzles and an AutoJet spray controller. PulsaJet spray nozzles AutoJet Model 2250 spray controller Queen Roll King Roll Paper