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When a three-piece aerosol can is inverted, in most cases, gas is sprayed, not liquid. Even if a small amount of liquid is ejected with the gas, it will be intermittent and uneven, significantly reducing the spray effect. The liquid cannot be sprayed properly, resulting in inefficient use of the remaining contents in the can.

In high-pressure aerosol products, the internal pressure is often much higher than that of ordinary packaging containers. The three-piece aerosol can is suitable for such products primarily due to the following factors: • High structural strength • Scientific material selection • Reliable valve seal

Three-piece aerosol cans have high internal pressures. Puncturing the can instantly releases the compressed gas, causing the can to rupture rapidly. This explosion not only creates a powerful impact but can also eject metal fragments, causing cuts, punctures, or other serious physical injuries.

Liquid products often contain pigments, active ingredients, or particulate matter. Without agitation, precipitation can accumulate at the bottom of the can, leading to nozzle clogging. A metal ball continuously rubs against the can walls and the liquid surface during shaking, reducing precipitation and ensuring smooth spraying.

• At room temperature, the pressure inside an aerosol can typically range from 2 to 8 atmospheres. • Once the temperature rises above 40°C, the internal pressure increases significantly, exceeding the design pressure limit of the can material and causing a rupture.

Step 1: Confirm that the can is completely empty. · Press the nozzle until the last drop is released. · Invert the nozzle to confirm that no gas or liquid is ejected. · If a pressurized propellant (such as butane) is present, handle with caution and avoid open flames. Step 2: Label or perforate the can (if permitted). Step 3: Dispose of the can in a metal recycling bin.

A standard three-piece tinplate aerosol can withstand pressures of 12-18 bar (176-260 psi), meeting the international DOT 2Q (180 psi burst pressure) standard. The reinforced design of the cone and dome directly determines whether the can can withstand the expansion pressures experienced during daily transportation, storage, and even high-temperature environments.

The three-piece aerosol can is the most common aerosol packaging format on the market. It consists of three main components: the can body, the cone (the conical top), and the dome (also known as the bottom). The can body is typically made of tinplate steel and joined by crimping or welding. The cone is attached to the top, and then combined with the dome to form a complete three-piece structure.

According to U.S. Code of Federal Regulations (CFR) 49 §173.306, metal aerosol cans must not exceed an internal pressure of 180 psig at 54.4°C (130°F), and the container must be able to withstand at least 1.5 times the thermal equilibrium pressure without rupture or deformation.