Laptop keyboard is the closest component with users except screen. So, to choose a transparent and anti-dirty, comfortable keyboard protector is your best choice. Maybe, someone would worry about the problem of heat emission. Then, whether it would affect it?
The material at the bottom of the laptop keyboard is indeed metal and the keyboard was definitely designed for the heat emission. But the use of keyboard protective film won't affect it essentially.
For the reason that the keycap is made of plastic which couldn't transfer the energy through contact with fingers. Besides, the protective film is ultra-thin; the film won't hinder the transferring.
Does the use of metal keyboard backplane to help heat emission are ridiculous? In fact, the principle is very easy to understand. Because the heat can be transferred by radiation, designers use the metal keyboard backplane to disperse and share the energy around Cpu and Graphics. And then, the large area of thermal radiation could help to reduce the heat. In the process of selling keyboard protector, the users also reflect not observed heat phenomenon while using the keyboard protective film.
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