What should I pay attention to when purchasing smart dimming glass?
[China Glass Network] 1. See the manufacturer
Smart dimming glass products are high-end glass products, which can be called luxury goods in glass. Of course, we must choose products that are worthy of their quality. At present, most of the domestic dimming glass processing manufacturers have a processing history of no more than 3 years, and there are few engineering cases (some manufacturers borrow fake engineering propaganda from each other). The quality and reputation are subject to time verification, and more care should be taken when purchasing. Buying well-known brands on the market or dimming glass products produced by well-known manufacturers, you can choose regular professional glass manufacturers (such as: **** Glass Co., Ltd.) instead of dimming glass sales such as trading companies and technology companies. Agents or intermediaries can avoid potential risks and enjoy good quality and after-sales service.
2, see technical parameters
For customers with strict quality requirements, it is necessary to have a more detailed understanding of the technology of dimming glass.
a. Good quality dimming glass with excellent light transmission when it is energized, clear and transparent, beautiful appearance and transparent and opaque when power is off, which can protect privacy very well. Simple test method: put the palm of your hand on the back of the glass. When the power is off, look at the palm of the back from the front. Although you can see the blurred back, you must not see the fingerprint of the palm. Or an object can be placed at a distance of 3cm from the front glass. When the two sides of the light are balanced and not one side is backlit, and one side is strong, the object should not be seen from the reverse side. The light transmittance of a good quality dimming glass should be around 75%.
b. Corresponding to the non-indoor use of dimming glass for bathroom and bathroom partitions, exterior and exterior curtain walls and doors and windows, should the operator adjust the glass interlayer film to EN or PVB for interlayer. PVB (polyvinyl butyral) has been used as an interlayer for more than 30 years. The polyvinyl alcohol segment of PVB has a strong water solubility, is sensitive to humidity, and requires more energy and cost when using PVB. It will rise accordingly. PVB processed products have a high haze, generally have a haze of more than 10% and a transmittance of less than 70%. In addition, their specific chemical structure determines poor resistance to acetic acid, alcohols and ketones, and may even be Dissolving or softening to lose the cohesive force, it is easy to cause the problem of opening and degumming during the construction process. EN (polyethylene-vinyl acetate) as an interlayer can avoid the above problems and has a better transmittance, so the replacement PVB interlayer has been gradually updated worldwide. However, laminated glass for curtain wall glass and outdoor applications is generally not recommended as an intermediate film, and dimming glass is not recommended. At present, there are almost no dimming glass for outdoor engineering projects in the international and domestic markets.
c. Consumers can choose to use the corresponding glass panel according to the requirements of glass functionality in the application field. Generally speaking, the standard requirement of the original glass for dimming glass is relatively high, so the choice of automotive grade float glass is used as a tune. The substrate of the light glass. Most manufacturers or new manufacturers will recommend the use of tempered glass as the substrate for dimming glass, but the transparency and flatness of tempered glass are not as good as float glass. Due to the different stretching force, the dimming glass will open and Degumming phenomenon.
d. The choice of dimming glass in the installation situation should be installed by the manufacturer with professional installation team. For the need of hanging installation, try to avoid punching. Because punching on the dimming glass will change the internal molecules of the liquid crystal film. The order of the sorting causes the dimming glass to burn out during use. At present, some manufacturers in China have mastered the advanced frameless suspension lifting method, which effectively solves the problem of punching the dimming glass hanging installation.
3, dimming film quality
The quality of the dimming film is one of the more important factors determining the quality of the finished dimming glass. Therefore, the quality of the dimming film of the dimming glass manufacturer should be discerned when purchasing the dimming glass.
The liquid crystal film originated in the United States earlier, and later developed into Japan, South Korea, Taiwan and other countries and regions. In order to make the liquid crystal film have reliable performance and stability, the standard width of the internationally accepted liquid crystal film has been controlled at 3000mm x 1200mm. Nowadays, some domestic LCD film manufacturers have modified on the basis of foreign used machinery and equipment. In order to compete for market share, a liquid crystal film with a width of 1800mm has been introduced, but its performance and stability are poor, and it can not reach The use of safety voltage requirements, liquid crystal film liquid crystal coating uniformity and other technical indicators cannot be guaranteed. The technical content and difficulty of producing a dimming glass liquid crystal film are very high, so it is recommended that users do not blindly pursue large sizes.
4, see the project case
For the purchase of dimmable glass products with stable performance and guaranteed after-sales service, it is more important to look at the relevant application engineering cases of the manufacturers. When we choose a manufacturer, we must not only look at the actual engineering case of the manufacturer, but also carefully check the actual photo of the actual installation site of the manufacturer's dimming glass, instead of the effect picture of the PS after the computer. Therefore, before purchasing dimming glass, you can ask the manufacturer to provide several well-known works and real photos for reference.
5, see production equipment
The general customer's understanding of the dimming glass is not very thorough. When choosing the dimming glass, the pursuit of low price and blind pursuit of permeability. However, it is necessary to remind consumers that the use of PVB film in the production of dimming glass by autoclave has the main advantages of high transparency and high bonding strength, but the temperature of PVB must reach 135 degrees to meet the requirements of transparency and bonding strength. The aging temperature of the liquid crystal film is only 120 degrees. Therefore, the edge shrinkage of the dimming glass made by the autoclave is generally 6-10 mm, such a wide bright side, when the partition requiring the seam is required, a transparent zone of 10-20 mm is formed between the two glasses, and is not electrically controlled. The seam stitching effect at the glass splicing is very poor. At the same time, the shrinkage rate of PVB film in the autoclave production process is a major drawback that causes a significant reduction in the performance and life of the dimming glass. At present, in order to improve production efficiency, some domestic manufacturers use high-temperature autoclave to produce, so that the whole of the dimming glass products will appear yellow in the process of use, the transparent and opaque liquid crystal film can not be converted normally, and the liquid crystal film gradually shrinks. Therefore, it is recommended to use a high-temperature and high-pressure one-step vacuum forming method to obtain a dimming glass, which has the advantages of relatively stable product performance and long service life.
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