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WORLD PULPPAPER 79 The payback period for the new spray equipment was about seven months. In addition the manufacturer has improved sustainability by eliminating components that were previously discarded Figure 2. Eight PulsaJet Automatic Spray Nozzles apply a light mist of water on the tissue to ensure it adheres to the metal rod AutoJet Modular Spray System Air Line Electric Line PulsaJet spray nozzle Liquid Line 1550AutoJetModularspraySystem AtomizingAir Liquid FanAir CASE STUDY 2 PAPER MANUFACTURER REDUCES PAPER BREAKS BY 75 WITH NEW SPRAY SYSTEM Problem A manufacturer of linerboard needs to spray water on the queen roll in the calendar stack. The consistent low-flow application of water on the roll at the edge of the sheet wets the roll to prevent the mills coated paper from sticking to the roll. Air atomizing nozzles were previously used but because of the high mineral content in the make-up water the nozzles plugged frequently. When the nozzles failed to apply the water sheet breaks occurred and resulted in expensive downtime. Solution Spraying Systems Co. used four PulsaJet automatic spray nozzles controlled by an AutoJet Modular Spray System to solve the mills problem.Two PulsaJet nozzles are mounted on each end of the queen roll to spray the 20 508 mm gap between the edge of the paper sheet and the end of the roll. The AutoJet Model 2250 Spray Controller triggers the nozzles to spray whenever the paper machine is in operation and uses Precision Spray Control PSC to achieve the desired flow rate based on the machine speed. By precisely adjusting the electrically-actuated PulsaJet nozzles an extremely low flow of water is applied to the queen roll using hydraulic flat spray nozzles. The flat spray nozzles have larger nozzle orifices and are much more resistant to plugging than those of the previously used air atomizing nozzles. The system includes an electromagnetic liquid flow meter. Alarms are generated by the spray controller if reduced flow is detected indicating one or more plugged nozzles. Operators can then immediately inspect and clean spray tips without stopping the paper machine and return the system to full flow. Figure 1. The AutoJet Model 1550 Modular Spray System triggers the nozzles to spray when a sensor is received from the winding machine