The Secret of Acoustic Insulation

Add: Beijing

First of all, I want to talk to you about noise. We all know that sound is generated by vibration, the frequency of vibration determines the level of sound. Everyday we hear at home is mainly the noise caused by traffic, such as the friction between tires and the ground, exhaust and engine sound, etc. Most of them are low-frequency noise. Unlike the relatively sharp high-frequency noise, low-frequency noise encounter obstacles and with the increase in distance when the decibel rate of decline is very slow, and the sound waves are very long, so it can easily through the obstacles, long-distance running and through the wall straight into the human ear, it seems as if the harm is far less obvious than high-frequency noise, but in fact it is a potentially high damage, injuring people in the invisible ways.


So, is there a way to reduce this low-frequency noise? Of course, there are many manufacturers on the market of soundproof windows. To break it down, there are roughly three types: vacuum glazing soundproof windows, insulating glazing soundproof windows, and laminated glazing soundproof windows. Let’s start with the vacuum glazing windows, which are of more concern to consumers.


city soundproof glazing


Vacuum Glazing


Conclusion is, vacuum one is not the best soundproof window. This time you may ask, why? Physics teacher taught us clearly: the transmission of sound needs a medium, the vacuum can not spread the sound. In fact, vacuum glazing is not totally vacuumed. Vacuum glazing is different from the vacuum jar like we do experiments in the classroom, there is no way to do the real vacuum condition between glazing. The reason is very simple, once there is a complete vacuum, the pressure outside the glazing will be much greater than the internal, then the glazing will be overwhelmingly crushed.


Therefore, in the middle of the vacuum glazing products, there will be some solid support bases so tiny that even invisible to the naked eye, solid like bridges, the noise will be transmitted through it to the interior, and the sound insulation effect will be reduced. And as we all know, the absolute vacuum is a difficult state to maintain, the gas will gradually leak: The gas gathered on the surface of the glazing will diffuse into the vacuum layer under the effects of temperature and sunlight.


Insulating Glazing


Since vacuum glazing is not really vacuumed, what about insulating glazing? Buyers who have seriously investigated the product know that insulating glazing is a kind of sound-insulating glazing made of two or three panes of glazing, using a high-strength, high-gas-tight composite adhesive to bond the glazing panes with the window frame containing the desiccant. So how soundproof is it? Anyone who has insulated glazing windows in their home will probably have the experience of hearing the low hum of cars passing by on the road when the windows are closed. This is the low-frequency noise we mentioned above. It is proven that insulating glazing windows can block the sound of talking and high-frequency noise, but the effect on low-frequency noise is not ideal.


Laminated Glazing


The last product to be introduced is this grand finale – laminated glazing. We mentioned that sound is transmitted by vibration, so reducing the frequency of vibration can reduce noise, that’s how the laminated glazing works. Laminated glazing is generally composed of two layers of glazing and film: The two layers of glazing are made of different materials, which can block different wavelengths of sound waves, and the film in the middle of the laminated glazing is equivalent to a damping layer, which can effectively suppress the vibration of the glazing and thus improve the sound insulation performance of the glazing, which is useful for road noise, which is mainly low and medium frequency noise.


Some users reflected why the laminated glazing windows at home seem to become less soundproof in winter. In fact, it is because the laminated layer of glazing is frozen hard and loses its elasticity, so naturally it can no longer play the role of vibration and noise reduction.


In summary, if you consider the sound insulation effect alone, laminated glazing is better than insulating and vacuum ones, of course, vacuum and insulating glazing also have their own advantages, and can not directly make a superior or inferior judgment.


Hope you have a step forward in understanding of sound insulation capacity of glazing on windows and doors after reading the above introduction. Please feel free to contact us if you have any questions!





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