According to the national salvation study by the manufacturer of automatic sealant machine, the causes of fogging in hollow glass are as follows: the seal fails and leaks, or the seal is intact, but the desiccant can not absorb the water vapor in the hollow cavity completely, and the water vapor in the cavity condenses on the glass surface under the action of the temperature difference between indoor and outdoor. The so-called condensation is just like the ice-cream we usually eat. After we wipe the water on the plastic packaging surface with paper towels, new water droplets will appear on the surface soon. This is because the moisture in the air condenses on the outside surface of the ice-cream packaging (i.e. the effect of temperature difference).
Therefore, only if the following four points are made, the hollow glass will not be inflated or foggy (condensation):
1. The first sealant, butyl rubber (butyl rubber tape), must be uniform and continuous, with a width of more than 3 mm after pressing. This sealant is connected between aluminium spacer and glass. The reason why butyl rubber (butyl tape) is chosen is that butyl rubber has incomparable water vapor permeability and air permeability. It can be said that more than 80% of the anti-water vapor penetration tasks of hollow glass are on this glue. If the seal is not good, the hollow glass leaks, and do more work, the glass will fog.
2. Selection of the second sealant. Considering the anti-ultraviolet factors, most of the windows and doors now use AB two-component silicone gel. Although the water vapor tightness of silicone gel is poor, it can play a very good auxiliary sealing, bonding and protection role.
3. Hollow glass desiccant 3A molecular sieve is also very important. The characteristic of 3A zeolite is that it absorbs only water vapor and does not absorb any other gases. Only enough 3A molecular sieves can absorb the water vapor in the hollow glass cavity, keep the gas dry, and will not produce fogging condensation phenomenon. Even in the environment of 70 degrees below zero, the hollow glass with good quality will not have condensation phenomenon.
4. In addition, it is also related to the production process that the hollow glass can not fog. Aluminum spacers for filling molecular sieves should not be placed too long before they are laminated, especially in rainy season or in spring tide weather like Guangdong Province. More attention should be paid to controlling the time of lamination. Because the hollow glass will absorb water in the air for too long, the molecular sieve with saturated water absorption will lose its adsorbing function, and fog will occur when the film is combined because it can not absorb water in the hollow cavity. In addition, the filling of molecular sieves has a direct relationship with fogging and non-fogging.
Okay, that's the highlight of this issue. I don't know if my little friends understand it after reading it. If you have any questions, you can always consult the official online customer service staff of automatic sealant machine: http://www.! Thank you very much for your support!