PNR automated spray system for food production applications

PNR’s automated spray system, available in Australia via Tecpro, uses Pulse Width Modulation technology to deliver accurate, repeatable liquid application while reducing product waste and overspray.

Unlike conventional systems that control flow by adjusting pressure, the PNR system rapidly pulses each nozzle on and off while maintaining consistent pressure. This allows manufacturers to vary the volume applied without affecting spray angle, droplet size or distribution — providing greater control when applying oils, coatings, release agents, preservatives and sanitising solutions.

The system combines electrically actuated MJ spray nozzles with a dedicated electronic control panel. By integrating with photoelectric cells, encoders and proximity sensors, it can synchronise liquid application with product presence and conveyor speed. Flow can therefore respond almost immediately to line-speed variations, helping maintain consistent coverage across every product.

Multiple nozzles can be operated in parallel for wider production lines, with frequency, duty cycle and operating parameters adjusted and monitored through a touchscreen interface. A single nozzle can also accommodate a broad flow-rate range, reducing the need to change nozzles when production requirements vary.

For food manufacturers, applications include oiling baking trays and food surfaces, applying egg wash and product coatings, dosing preservative solutions onto pizzas, snacks and baked goods, and spraying disinfectant solutions onto packaging.

Manufactured from AISI 316L stainless steel, the compact MJ nozzles are available in food-grade configurations and can be retrofitted to many existing production lines. The result is a more responsive spraying process that improves application consistency, reduces over- and under-application, and supports greater production efficiency.