Automatic inflatable pads are generally built-in high rebound full fat sponge, the specific principles are as follows:
Air cushion built-in high rebound full fat sponge, open the air mouth, sponge expansion, automatic intake, etc. to achieve the effect of tightening the air mouth can be. Because the first time when the factory is packed by the machine, it will be more slow, use several times or fold it repeatedly, the effect will be better.
Simply put, the pads are filled with foam pads inside! Of course, the concrete implementation is not so simple, usually glue the upper and lower layers of nylon and intermediate foam material together. It must be pointed out that the foam material here is not Close-cell but Open-cell, because only Open-cell foam material has good compressibility and resilience. Its purpose is very simple, the use of foam material good resilience, when opening valve, foam material automatically rebound expansion, the air inhalation cushion inside, realize so-called "inflatable." While the need to receive, manual pressure to exhaust air, close the valve, due to the great atmospheric pressure, can maintain the state of compression. Since the inner filling of the foam material, can be very good to lock the air, therefore, in a relatively moderate weight range to achieve a better thermal insulation, the price is much cheaper than filling down the inflatable cushion, at the same time and inflatable pad has almost small storage volume and similar comfort, and has a certain ability to inflate, do not need so much effort to blow gas.