The application of window film in improving the safety and energy saving of ordinary float glass can be traced back to 1960. At that time, the original intention of developing this film was to control the imbalance between cold and warm caused by solar energy load. Early films only reflected solar radiation out of the glass window to prevent the heat on the inner surface of the glass from increasing. ?
With the continuous development of manufacturing technology, a new generation of body color thermal insulation film was born. Its rich colors provide architects with a broad design space. The main colors are: brown, gray, gold, amber, blue, green and so on. ?
1970 the energy crisis in the United States has led to another aspect of membrane performance development-reducing indoor heat loss (that is, "insulation"). It is found that polyester film can not only be used as a transparent medium, but also has the ability to absorb and retroreflect long-wave infrared rays. After repeated experiments, the material and structure of the membrane have changed greatly. This change further improved the "heat insulation" of the film, and also produced a "low radiation film"-Low-E film. ?
Second,? Structure, performance, types and basic construction principles of window film;
The basic composition of the adhesive film is: polyester substrate (PET), with scratch-resistant layer (SR) on one side and adhesive layer and protective film on the other side. During construction and installation, the protective film is removed and the exposed side of the adhesive layer is attached to the inner surface of the glass (if the film is specially designed for external attachment, it is attached to the outer surface of the glass). ?
PET is a material with strong durability, firmness, high toughness, moisture resistance and high and low temperature resistance. Clear and transparent, after body dyeing, metallization electroplating, magnetron sputtering, sandwich synthesis and other processes. , and has become a unique film to meet the needs of commercial buildings, houses, shop windows, bank counters, museums, cars or ships and other different places. ?
Professional membrane manufacturers usually use their own patented adhesives for interlayer synthesis and adhesive layer installation. Mainly divided into: pressure sensitive adhesive and water molecule activated adhesive. ?
Window films for buildings are mainly divided into two series: building energy-saving films and safety films. The main varieties are: car body dyeing film, heat reflection heat insulation film, low reflection heat insulation film, high transmittance magnetron sputtering film, Low-E film, special film for museums and archives, frosted translucent decorative film, transparent safety film and so on. Four basic characteristics: heat insulation, energy saving, ultraviolet protection, beautiful and comfortable, safe and explosion-proof. ?
The safety film is usually composed of single-layer or multi-layer PET interlayer with the thickness of 2 mil (0.05mm), 4 mil (0. 10mm), 7 mil (0. 18mm), 1 mil (0.28mm) and/.
Window film can be called an "amphibious" product in the construction industry, which can be used for both renovation of old buildings and new construction. ?
The installation method of membrane is usually similar, that is, after the protective layer is removed, neutral soap solution or specially prepared installation solution is sprayed on the clean glass surface and the surface of membrane installation adhesive layer; Lay the film flat on the glass, cut off the excess corners, and use the installation tool to remove excess water. ?
Three. Research on energy-saving safety window film in China: (Source: Research on energy-saving safety window film)?
"Energy-saving and safety glass film" entered the China market in the late 1980s and early 1990s, and there is basically no production line for this kind of products in China. 1997, Shanghai Building Science and Technology Development Foundation took the lead in proposing the research topic of this product. In September of that year, with the attention of Shanghai Construction Committee, Science and Technology Commission and Municipal Building Materials Office, the project was formally established. ?
The research group mainly investigated the variety, quality and application of energy-saving and safety glass film in the domestic (Shanghai) market, and conducted information retrieval and analysis on this product at home and abroad, and reached the following conclusions:
1. The origin of energy-saving and safe glass films is mainly in the United States, and there are eight major manufacturers. International market share ranking:?
CPFilms？ Inc？ (formerly known as Courtaulds? Performance? Movie)? (USA)? 28%?
Madico? Inc. (USA)? 24%?
ITD？ Metallization? Product (USA)? 24%?
De? Positive? Technician? INC (USA)? 1 1%?
Movies? Technology? International? INC？ 10%?
GARWARE (India)? 9%?
3M (USA)? 7%?
Johnson? Lamination? & amp？ Coating? INC (USA)? 4%?
South? Wall? Technology (USA)? 1%?
Sony (Japan)? 6%?
Hanita (Israel)?
Korea?
Taiwan Province province?
2. The measured data shows that the outdoor temperature is as high as 38-39 degrees Celsius. Under the same conditions, for two rooms of 16 square meter, the film pasting room can reduce the maximum temperature by 3.5 degrees Celsius compared with the subsidized film pasting room, saving energy by 0.24 degrees Celsius/day. ?
Fourth,? Application prospect of energy-saving safety window film:
Energy-saving and safe window film, coated glass and dyed glass are all deep-processing production of original glass. Compared with the three, the energy-saving and safe window film processing is the most convenient, which can process both uninstalled glass and installed glass, making it easy to popularize. ?
There are 58 float glass production lines in operation in China's glass production industry, with an output of about 6.5438+0.344 million square meters, of which about 654.38+0.6-654.38+0.08% is deep processing, which means that about 654.38+0.65438+0.02 million square meters of flat glass is used for architectural decoration. With the development of science and technology, social progress and the promulgation of a series of national safety and energy-saving policies and regulations, window film, as a new high-tech building material, will gradually enter thousands of households, saving energy for society and bringing comfort and safety to people. ?
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