Aerosol cans are a unique and convenient packaging. Whenever we talk about them, we always want to know how they spray the liquid inside by pressing the valve. In fact, aerosol cans contain a liquid with a boiling point far below room temperature, which we call propellant. There is also a liquid with a boiling point higher than room temperature, which is an aerosol product such as detergent, insecticide, etc..
Next, we will use a simple design to illustrate this aerosol system. In fact, the manufacturer pours the product into the can and adds pressurized gas propellant. Here, there will be a question of why pressurized gas is added? Because it is very difficult to pressurize liquids, but it is much easier to pressurize gas. Then seal the aerosol can, and when the user presses the valve with his finger, the liquid inside is sprayed out in a mist
About the can that holds aerosol
Aerosol cans are containers for storing aerosols. In order to allow users to press the valve to make the aerosol product flow out evenly, aerosol can manufacturers must use pumps or compressors to squeeze the aerosol product into the can. Typically, the storage pressure of aerosol products in the can is 2 para 8 times the normal atmospheric pressure. This information is usually printed on the back of the aerosol can, with the prompts “pressurized container” and “contents stored under pressure”.
Valves and pipes
In each aerosol can, there is a plastic tube extending from the bottom of the can to the valve at the top of the can. When the user presses the aerosol valve with his finger, the pressure at the top of the aerosol can is reduced, and the product in the can is sprayed out through pressurized gas. However, the nozzle at the top is composed of some small holes. Since the liquid is partially blocked by the pipe and the nozzle when it is squeezed out, the small holes of the nozzle are used to form the mist gas we see. Portanto, different shapes of liquids such as foam and gel can be sprayed according to different products and nozzle types.
Factors affecting spray patterns
There are many factors that affect the spray performance of the aerosol can. If you don’t pay attention, it will affect the user’s spray performance.
Internal pressure
The first is the internal pressure of the aerosol can, which directly determines the range and uniformity of the spray. When the user presses the nozzle with appropriate pressure, the product can be released evenly. If the pressure is too low, the product will be sprayed less or not at all. If the pressure is too high, too much product will be sprayed, resulting in poor spraying effect.
Nozzle design
The shape and size of the nozzle will affect the atomization degree of the liquid. A good nozzle can achieve delicate and uniform spraying. Além disso, the viscosity of the liquid is also an important factor. Too high viscosity may cause poor spraying, while too low viscosity may cause uneven spraying.
Ambient temperature and gas composition
Also affecting the spray performance are the ambient temperature and gas composition. The appropriate temperature and propellant selection can optimize the spraying effect. Finally, the angle and distance of the spraying also need to be adjusted according to the specific situation to ensure the best coverage effect.
No matter which aerosol you choose to use, you can be sure that Fanxun has the expertise and high-quality aerosol can products to meet your packaging needs. Please view our aerosol can product line to find the product you need, or contact us today.
