What is the most important thing about soundproofing? The most important thing is the sealing, there is a saying that is not leaky, as long as the sealing is good, the indoor and outdoor air blocking open, by airborne noise naturally can not be transmitted to the indoor. Solve the problem of sealing first, and then consider the problem of materials. In terms of sealing, the best window type is casement window! Sliding windows do not have a good seal as casement windows, so the sound insulation effect is a little worse than casement windows.
Window frame materials, we know that metal materials spread sound vibration speed is the fastest, aluminum alloy is metal, broken bridge aluminum is metal (partition bridge is used for thermal insulation), so with broken bridge aluminum and aluminum alloy sound insulation effect will be a little less than satisfactory, and because of broken bridge aluminum, aluminum alloy is the reason for the splicing process, they are gaps, the sound may come in from the gaps. The rest are plastic steel, aluminum clad wood, timber frame.
We consider the durability, wood is easy to deform and slightly expensive, aluminum clad wood is easy to heat expansion and contraction and expensive, leaving only plastic steel. Our Chinese conch plastic steel do quite well, people crooked new research what technology, conch will learn, so we have been using the conch plastic steel to do soundproof window frame, 1 is cheap, 2 is durable, 3 is the material is thick to meet the load capacity of our glass, 4 is that it is very much love to learn from the technology of the crooked people.
There are 3 kinds of glass, the more popular is insulating glass with broken aluminum, broken aluminum we all know, metal, splicing process, sound insulation will not be very good. Insulating glass this well, the crooked invented it, itself is to insulate, is in the middle of the two layers of glass to drain the air, and then injected with inert gas, and then sealing glue, the standard minimum is 6 + 6 tempered glass, it is used to insulate the heat. But our clever Chinese, invented a simple two layers of glass in the middle of the plug a desiccant, and then directly sealing glue, two layers of glass in the middle of the air, haha, which inert gas ha, you go to find 1,000 glass factories, there are not a few are in accordance with crooked standard to do, are in the study of how to minimize the cost of the process is the simplest, not to mention that, it is not acoustic glass, just our clever Chinese! Take it as insulating glass to publicize it, and even written into the textbooks. Insulating glass so many people do not because it is really soundproof, it is a simple process.
Vacuum glass, two layers of glass in the middle of the extraction of 70-80% of the air, leaving 20-30% of the inert gas in the middle of the two layers of glass, and then two layers of glass in the middle of the pad PVB adhesive particles to the top of the two layers of glass, do not allow them to adsorb together. If the plastic bottle to extract air, it is soft can be deformed, can be adsorbed together. And the glass is rigid, if the absolute vacuum, then the glass will be the atmospheric pressure pressure burst, so the vacuum glass is not an absolute vacuum, is at least 20% of the air or inert gas residue. We all know that when we squeeze all the air out of a plastic bottle, the bottle will be flattened, and after a few days the bottle will be back to its original shape, is because it has been inhaling the outside air, just slower, so the vacuum glass will slowly become hollow glass. We generally do not do vacuum glass, the first few years to change the glass to change the headache, the customer with 2 years will not work, we have to go to the after-sales, and now do not dare to do vacuum.
The last one is PVB laminated glass, which is the glass we currently use. Laminated glass has the advantages of sound insulation, heat insulation, explosion-proof, radiation protection, we use the dry clip process, the glass and PVB into the high-temperature furnace inside the high temperature and pressure to dissolve and press into a piece of glass. This is the standard for crooked people. But the clever Chinese invented two layers of glass filled with glue, the use of DEV film, or other films to replace the PVB, this material-saving and time-saving practices, so that the glass is not enough acoustic effect, and in a few years the glass seems to be like a yellowed old photographs.
Currently dealing with low and medium frequency noise, we are using laminated glass to solve the problem, you can do indoor 30-40 decibels, low and medium frequency noise refers to the automobile tire noise, automobile engine noise, ship buzzing, people talking voice ...... The PVB film of PVB laminated glass can effectively filter the low and medium frequency noise, and the effect is very obvious.
High-frequency, everyone guessed also guessed, is the dog barking, school radio, square dance mom .... Noise, encounter this high-frequency noise will need to look at the number of floors, because high-frequency is a short wave penetration, so as long as the distance is enough, it can be attenuated into low-frequency noise. If the distance is not enough, then strengthen the thickness of the glass, density and PVB thickness to solve the problem. (Airplanes, we all know that aircraft noise is very harsh, but why do we hear a buzzing sound? (Because this stuff is too far away from us, high frequency has been attenuated to low frequency, and generally only high floor can hear the airplane sound, the floor is low can not be heard).
And high floors of you are blessed, especially living in the airport take-off point, that is high-frequency noise, the aircraft passes by the roof of your building is more than 90 decibels of noise environment, and it is not a class of airplanes, but in a few minutes on the fly a plane. Even if there are no airplanes, customers on high floors have to suffer, because when you live on a low floor there are other floors to help you block the noise. If you are a high-rise, for example, the 20th floor to face the noise of 100 meters in a radius, the 30th floor may face the noise of 300 meters in a radius, the sound of the car in the low-frequency there is a low-frequency noise in the low-frequency noise is characterized by the sound wave is long, the sound travels far. I don't like this kind of low-frequency noise, it will slowly make the ears of children under 8 years old become insensitive, the performance is that you speak once the tone of voice is not very clear, he can't understand what you are saying.