What factors will cause uneven spraying of fine mist sprayer

Fine mist sprayers are widely used in many fields such as medical, cosmetics, and agriculture. The uniformity of their spray directly affects the use effect and user experience. The problem of uneven spray not only reduces product performance, but may also cause customer complaints and affect brand reputation.

Nozzle design and manufacturing accuracy
The nozzle is the core component of the fine mist sprayer. The quality of the spray depends largely on the nozzle structure design and manufacturing process. The nozzle aperture size, aperture shape, and hole position distribution will directly affect the spray particle size and spray angle. Irregular or large deviation apertures will lead to uneven distribution of spray flow, forming a mixture of large and small particles, resulting in uneven spray. In addition, the nozzle material and surface finish will also affect the flow state of the liquid. Rough or defective nozzle surfaces are prone to cause droplet aggregation or breakage.

Liquid physical properties
The physical properties of the liquid, such as viscosity, surface tension, and density, have a significant impact on the uniformity of the spray. High-viscosity liquids have a large flow resistance, which can easily lead to unstable nozzle flow, intermittent spraying or uneven spraying. Liquids with large surface tension are not easy to atomize, forming larger droplets, which affects the fineness and uniform distribution of the spray. Density changes affect the kinetic energy of liquid injection, resulting in fluctuations in spray distance and coverage area.

Operating pressure and flow control
The driving pressure inside the sprayer is the key power source for liquid atomization. When the pressure is too low, the liquid cannot be fully atomized, the spray particle size is too large, and the spray distribution density is reduced; when the pressure is too high, the nozzle may be damaged or the liquid may be sprayed too quickly, resulting in unstable spray jets. Imprecise flow control will lead to uneven liquid supply, unstable nozzle output, discontinuous spray or uneven spray density.

Equipment maintenance status
Nozzle blockage is one of the most common problems that lead to uneven spray. During use, impurities or dried residues in the liquid will accumulate in the nozzle hole, restricting the flow of liquid and affecting the spray shape. Regular cleaning and maintenance of the nozzle are not in place, resulting in a reduction or deformation of the nozzle aperture, coarsening of the spray particles, and even spray interruption. Aging and damage of the internal pipelines will also affect the liquid transmission efficiency and cause unstable spray volume.

Environmental factors
Ambient temperature and humidity have an indirect effect on the physical properties of the liquid and the spray state. High temperature environment will reduce liquid viscosity and improve atomization efficiency, but it may also accelerate liquid evaporation, resulting in uneven spray distribution. Low temperature environment may increase liquid viscosity and increase spray particle size. Humidity changes affect the moisture content in the air, change the evaporation rate of spray droplets, and thus affect the continuity and uniformity of spray.

Liquid supply system design
Whether the design of the liquid delivery system is reasonable affects the stability of the liquid supply of the sprayer. The layout and sealing of components such as liquid storage tanks, infusion pipelines, and valves will affect the flow resistance and pressure fluctuations of the liquid. If the infusion pipeline is too long or has too many bends, it will cause pressure loss and unstable flow, resulting in uneven spray. Unreasonable storage tank design may cause uneven mixing of liquids, further affecting the spray effect.

Mechanical vibration and installation stability
The mechanical vibration of the sprayer can cause the nozzle position to shift or the spray flow state to be unstable. Especially for handheld or mobile devices, the spray particle size and spray angle are prone to change when vibration is frequent, forming uneven spray. Unstable installation or loose fixed parts can also cause the nozzle to shake, affecting the continuity and uniformity of the spray.

Operator skills and usage methods
The operator's understanding of the equipment and usage habits also affect the uniformity of the spray. Incorrect operating steps, such as failure to adjust the pressure and flow rate according to regulations, or the use of unsuitable liquids, will cause the spray performance to deteriorate. Lack of knowledge of sprayer maintenance can easily lead to frequent equipment failures and affect the spray quality.