After the aluminum alloy handrail is exposed to the sun, due to the principle of thermal expansion and cold contraction, the metal material of the handrail will expand when heated, resulting in tiny gaps or friction with other parts, thus generating noise. This kind of noise will be a slight click or rubbing sound, which will not affect the safety of use, but it will give people an uncomfortable feeling or produce some noise.
The noise of aluminum alloy handrails in exposed environment is mainly caused by thermal expansion and cold contraction caused by temperature change. Aluminum alloy handrails are exposed to the sun for a long time, and exposed to high temperature, the temperature of the handrails will rise, leading to expansion.