Rock wool sound absorbing panel

By changing the variety and density of the thermal core material to reduce the collision noise that initiates the surface of the metal surface, the noise generated by the core material noise reduction is suppressed, Different sound absorption effects are produced by combining the sound absorbing materials in the metal steel plate and the sound absorbing material in the panel. Through the experiment this noise reduction effect produces no noise reduction effects not less than 29decibels based on the frequency of foreign noise and the thickness of the core material.