Air pillow membrane structure is also carried by the pressure difference between inside and outside the membrane surface. Air pillow and its combination can be used as roof or facade and other envelope structure. In order to make the air pillow roof have good light transmission and insulation effect, ETFE film is generally used. The inner membrane can be increased inside the air pillow to reduce the convection of gas, thereby improving its insulation effect.

At the Stuttgart International Horticultural Fair in 1993, the airship Lotte’s spectacular temporary hangar was filled with helium and consisted of cone-shaped elements that could be turned on and off.

The British Eden ETFE membrane structure project is located in an abandoned clay mine near Deep Austell, Cornwall, southwest England, costing 87 million pounds, and was officially opened to the public in March 2001. The world’s largest greenhouse consists of four dome-like buildings connected by a hexagonal steel pipe skeleton covered with a transparent membrane structure made of ETFE membrane. Film thickness 50~25mm, a total of three layers, with 200~750Pa air pressure inflation. If glass is used as the roof material, the lower part needs three times the steel structure to support, and the weight of ETFE film is only 1% of the same thick glass plate, and the energy consumption during manufacturing is greatly reduced. ETFE film material has a service life of up to 25 years, it is light insulation, and there is air between the layers, so it has a very good thermal insulation effect.

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