The Production Methods of Low E Glass

Coated Glass can be divided into the following categories according to the different characteristics of the product: Heat-reflective Glass, Low-e Glass, Conductive Film Glass, etc. Heat-reflecting Glass is generally coated on the glass surface with one or more layers of metal such as chromium, titanium, or stainless steel or a compound thereof, so that the product is rich in color, has suitable transmittance for visible light, and has higher infrared ray Reflectivity, which has a high absorption rate for ultraviolet rays, is also referred to as solar control glass and is mainly used for architectural and glass curtain walls; Low Emissivity Glass is composed of layers of silver, copper, tin, or other metals or compounds on the glass surface. The thin film system has high transmittance for visible light, high reflectivity for infrared ray, and good thermal insulation performance. It is mainly used in construction and vehicles such as automobiles and ships. Due to poor film strength, it is generally Made of hollow glass; conductive film glass is coated with indium tin oxide and other conductive film on the glass surface, can be used for glass heating, defrosting, defogging, and as a liquid crystal display.

The current two methods of production of Low-E glass on-line high temperature pyrolysis deposition method:

On-line high temperature pyrolysis deposition

On-line Low-E Glass has products from several companies in the United States. Such as PPG's Surgate200, Ford's SunglasH. R"P". These products are completed during the float glass cooling process. The liquid metal or metal powder is directly sprayed onto the hot glass surface. As the glass cools, the metal film layer becomes part of the glass. Therefore, the film is hard and durable. The Low E Glass produced by this method has many advantages: it can be bent and tempered, it does not have to be used in the hollow state, and it can be stored for a long time. Its disadvantage is poor thermal performance. Unless the film is very thick, its "u" value is only half that of the "Low-E" coated glass of the sputtering method. If you want to improve the thermal properties by increasing the film thickness, then the transparency is very poor.

The Offline vacuum sputtering

Off-line Low-E Glass is currently the world's most commonly used vacuum magnetron sputtering coating technology. Manufacturers and products that can produce Low-E Glass by sputtering are "LnplusNetetralR" from Interop Inc. in North America, Sungatel00 from PPG, and SunglasHRS from Ford. Unlike high temperature pyrolysis deposition, sputtering is off-line. And according to the different transmission positions of the glass, there are horizontal and vertical points. Sputtering process to produce Low-E Glass requires a layer of pure silver film as a functional film. Pure silver film is between two metal oxide films. The metal oxide film provides protection to the pure silver film, and increases the purity and the light transmittance of the color as an intermediate layer between the film layers.