The Importance Performance of Spray Nozzle in Paper Making Process

As a small and inconspicuous component on the entire paper machine, the spray nozzle used in papermaking can be seen everywhere from the headbox, wire section, press section, dryer section, and winding section. The quality of the nozzle application determines the quality of the paper produced by the manufacturer, the service life of various felt and fabric, the consumption of water or chemicals, and may even cause unnecessary paper machine downtime or equipment damage. So although the paper making nozzle is small, it is a question that any paper making manufacturer cannot ignore.

Paper making spray nozzle is fine components designed to perform specific functions under very special conditions. Other system components, such as spray bar, controller and accessories, will affect the nozzle spray function.

It is necessary to select appropriate nozzles and auxiliary components, and develop inspection and protection plans for good spray performance.

Spray Nozzle Flow Rate

The size of the flow rate is primarily influenced by factors such as the diameter of the spray nozzle and pressure. Normally, the larger the spray nozzle diameter, the greater the flow rate; Under equal aperture, the greater the pressure, the higher the flow rate. In addition, the flow will also be affected by the spray medium. Under the condition of equal aperture and equal pressure, the flow will decrease with the addition of medium viscosity.

Pressure for Spray Nozzle

Under normal pressure conditions, the spray nozzle will only achieve the desired atomization effect when it reaches the standard pressure. If the pressure is lower than the minimum requirement required by the   spray nozzle, the atomization effect will be reduced, and the pressure will also affect the flow rate of the nozzle. Without changing the nozzle parameters, adding pressure can increase the flow rate of the nozzle. Usually, devices such as booster pumps can be used to add pressure to liquids, while devices such as air compressors can be used to add pressure to gases.

Spray Angle

Spray angle refers to the angle at which the atomized liquid spreads. Even with the same type of spray nozzle, there will be a variety of spray angles that can be selected. The details vary according to customer needs, but even with the same spray nozzle, the spray angle will be slightly different under different pressures. Generally, the larger the spray angle is, the larger the masking scale will be when the height and pressure of the device remain unchanged.

Spray Area

The spray area is mainly restricted by the spray angle and the height of the spray nozzle device. When other parameters of the spray nozzle are fixed, the larger the spray angle of the nozzle, the wider the spraying area; The higher the height of the nozzle device, the wider the scale of spray masking.

Spray No Impact Force

The impact force of the spray nozzle is mainly affected by factors such as pressure, spray angle, and medium viscosity. Generally, the higher the pressure, the stronger the impact force; the smaller the spray angle, the stronger the impact force; and the lower the fluid viscosity, the stronger the impact force.

Spray Nozzle Working Temperature

Due to the varying temperature resistance of spray nozzle made from different raw materials, temperature primarily affects the selection of nozzle materials. As long as the temperature of the liquid (spray medium) does not exceed the temperature tolerance scale of the nozzle itself, it will not affect the spray function of the spray nozzle itself. However, because the temperature will affect the viscosity and specific gravity of the liquid, the spray results will eventually be slightly different.