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    EVA Cavity Barrier

    Cavity filling technique, that is, to within a body cavity filling material injected into the fluid, it condenses filling inside. After welding the presence of some of the white car body side closed casing reinforcing beam structure, the so-called "bypass cavity structure", such as A, B, C pillar, threshold, front wall and side panels and the like. In addition to the cavity will be passed outside the car noise, such as engine noise, exhaust noise, wind noise and tire noise, but when the car at high speed, these cavities will produce high-speed airflow. At the same time, the bypass cavity resonance box like instrument, causing the cavity resonance noise with noise amplification effect. It has the effect of sound-absorbing, sound insulation.

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