What is off - line Low - E glass in aluminum alloy doors and windows?
Off - line Low - E glass in doors and windows is manufactured by a vacuum magnetron sputtering coating production line. The principle is that in a vacuum environment, the plasma formed by negative high - voltage and working gas transfers the solid material (target material) to the surface of the glass of aluminum alloy doors and windows and deposits it into a film. When the working gas is argon, the deposited film is the same as the target material. When the working gas is an active gas such as oxygen or nitrogen, the deposited film is a compound generated by the reaction of the target material and the gas. Generally, a coating glass production line is equipped with multiple different target materials, which can continuously deposit independent film layers of different materials and superimpose them into a multi - layer composite film. Since the coating process is completed on an independent coating glass production line, it is called off - line Low - E glass, and the low - emissivity functional layer among them is a metal silver layer. Its advantages are: the thickness of the film layer is accurately controlled, and a multi - layer optical interference film system can be made to selectively control the solar spectrum passing through the film layer, and the reflective color of the film layer is various and adjustable, and the emissivity is low (less than 0.15); its disadvantages are: the film layer has poor hardness and is not resistant to corrosion, so it is also called "soft coating". It should be noted that the off - line silver - free Low - E film produced by the latest technology at present has the characteristics of wear resistance and corrosion resistance, so the film layer can be used facing the indoor side, and is simply referred to as silver - free Low - E film or indoor - side Low - E film.
