Choose the sound insulation cotton made of glass fiber, cut the size according to the length and diameter of the pipeline first, and then cut the aluminum foil paper according to the size. Note that the aluminum foil should be cut into larger sizes, wrapped in tubes, and then wrapped in aluminum foil tape. It should also be noted that masks and protective glasses should be worn when packaging.

Precautions for noise-proof cotton sewer bag: during construction, the sewer pipe in the bathroom should be closed as a whole, not only for local treatment; Secondly, the pipeline should be wrapped with sound insulation materials such as sound insulation board or sound insulation cotton around the bathroom riser.

Then surround the riser with light steel keel or light brick, so that the pipeline can achieve good noise reduction and moisture-proof effect. Note: try not to use wooden keel to avoid swelling and cracking in case of water. Sound insulation cotton has good heat insulation effect, which can effectively prevent the engine from sticking to the hood at high temperature and then directly transmitting to the hood, thus protecting the paint surface of the hood and avoiding the influence of fog on the hood in rainy days.

Another function of sound insulation cotton is heat insulation, which can reduce the heat transferred to the hood surface when the engine is running. Vehicles with noise-proof cotton hood will hardly produce white fog in rainy days. In rainy days and winter, due to the large temperature difference between the outside temperature and the engine, coupled with the erosion of the engine hood by rain, the oxidation of paint surface will accelerate. Thermal insulation cotton can protect the paint surface of range hood to a certain extent.

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