What is the working principle of the automatic inflatable pad for outdoor use?

The principle of automatic inflation of self-inflating products is to seal the open air chamber in a waterproof nylon shell, which will automatically expand when used.

Automatic inflatable cushions generally have built-in high-resilience full-fat sponges. The specific principles are as follows:

The air cushion has a built-in high-resilience full-fat sponge, open the air valve, and the rebound of HF-A361 Mummy self inflating pad the filling similar to the sea surface makes the air cushion absorb air; after closing the valve, the air is enclosed inside the air cushion. Since it is compressed and packaged by the machine when it leaves the factory, the first inflation will be slower, and the effect will be better if you use it several times or fold it several times.