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1, hollow glass structures

Hollow glass, also known as insulating glass is composed of two or more glass sheets, useful bulkhead separating gap between the glass plates, it is usually called insulating glass. Depending on the place of use of hollow glass, the raw material and the intended use of a different structure, hollow glass used are not the same. As in the southern region, higher annual temperatures, light a long time, in the use of hollow glass, more consideration is less able to control the external heat into the room, in the choice of insulating glass original films, will be more Consider using coated glass. In the northern region, the main purpose of the use of hollow glass is heating and insulation, so there will be more considering the selection of transparent glass for insulating glass of the original film. The need to control noise at the place, we need to use three or inflatable hollow glass, to achieve the purpose of use.

With economic development, product varieties more hollow glass has also been the development of varieties of raw materials used also increases, such as hollow glass curtain walls, doors and windows with insulating glass, hollow glass for automobiles, electrical hollow glass, decorative hollow glass, etc. All of these products, although for different purposes, use of raw materials has to do the same, but the basic composition is the same, namely: glass, sealants, desiccant gutter. In all the raw materials constituting the insulating glass sealant, desiccant performance is good or bad influence on the life of insulating glass products, greater energy efficiency when considering the issue, spacers and thermal conductivity is good or bad will directly affect the sealant hollow insulation performance of the glass edge, thus affecting the overall insulation performance of windows and doors.

Hollow glass production technology after decades of development, which itself is constantly being improved heat insulation, sound insulation performance. From the earliest welding method, welding method to bond aluminum strip method, heat insulation, sound insulation product performance has been greatly improved. After the oil crisis of the seventies later, it was discovered that aluminum strip method and edge insulation products must be poor, it must be improved in order to improve the overall insulating properties of hollow glass. By the early 1980s, the world's first system of warm edge insulating glass available, edge insulation performance is improved, better overall insulation effect, the hollow glass products in the market has broad application prospects.

2, insulating glass performance

(1), the best performance of insulating glass that is heat insulation performance. When building using single window, summer sun exposure will produce the greenhouse effect, that exposure to sunlight on the glass except the reflection off the outer part, a part of penetration of indoor temperature. In the winter, due to the thermal conductivity of glass is large, then play the role of single window heat insulating glass can reduce heat conduction and reducing convective heat and radiant heat transfer.

① reduce conduction heat transfer: a layer of thermal conductivity is much smaller than that of the gas between the glass insulating glass two glass, and therefore conduction heat transfer coefficient of insulating glass, much smaller than a single layer of glass.

② reduce convective heat: temperature difference on both sides of hollow glass in the outdoor cold glass plate is small, so a reduction of the heat conducted through the cold air convection.

③ reduce radiant heat transfer: radiation emissivity temperature objects radiate heat to the low temperature glass and objects related to a larger radiation emissivity glass is 0.82, if the glass layer low emissivity coated film, you can make it radiation reduce heat, played insulation. If the two inner surface of the hollow glass coated film and the low emissivity film respectively shade, block the hot summer sun, winter indoors to prevent heat loss, reached a cool goal.

(2), hollow glass anti-condensation, reduce cold radiation and safety performance since the hollow glass interior adsorbed water molecules can exist desiccant, gas is dry, the temperature is lowered, the interior of the hollow glass does not produce condensate Lu phenomenon. Meanwhile, in the outer surface of the hollow glass condensation will rise, such as when the outdoor wind speed of 5 m / sec., The indoor temperature of 20 degrees and a relative humidity of 60%, 5mm in outdoor temperature is 8 degrees, begin condensation . The 16mm hollow glass under the same conditions, -2 degrees when the outdoor temperature is condensation, 27mm3 layer insulating glass in the outdoor temperature is -11 degrees when starting condensation. Due to good insulation properties of hollow glass, the temperature of the glass on both sides of the difference is large. It can also reduce cold radiation. When the outdoor temperature is -10 degrees, the temperature of the interior single glazed front of -2 degrees, while the temperature of the hollow glass window in front of 13 degrees. In the same housing structure, when the outdoor temperature is -8 degrees, the indoor temperature is 20 degrees, 3mm ordinary single-glazed cold radiation region accounted for 67.4% of the interior space. The use of double insulated glass 9mm was 13.4%. The use of hollow glass, can improve the safety performance of the glass, in the case of the same thickness of the original sheet glass, hollow glass wind pressure strength is 1.5 times the ordinary monolithic glass.