Manufacturing method of automobile sound insulation pad

The invention relates to a manufacturing method of an automobile sound insulation pad. The method relates to a technology for producing a sound insulation pad used for reducing the automobile noise. The invention belongs to the technical field of automobile part sound insulation and noise reduction. According to the invention, a soft layer fiber felt, a PE air-permeating sound-absorbing membrane and a hard layer fiber felt are piled and aligned; the materials are delivered into a molding die; with a heat transferring method by using high-temperature steam with a high penetrating force, compression molding is carried out; profile dimensions and hole locations of the obtained pad are obtained by cutting; when the pad is examined and proved to be qualified, the finished product, which is the automobile sound insulation pad, can be obtained. According to the invention, the bonding between the soft and hard layer fiber felts is carried out with the high-temperature steam heat transferring method, such that bonding is carried out during compression molding, but not by on-site artificial adhesive coating. Therefore, human labor can be saved, productivity can be improved, production efficiency can be greatly improved, production site environment safety can be ensured, and the health of operators can be ensured. According to the invention, the air resistance of the sound insulation pad is adjusted by using the PE air-permeating sound-absorbing membrane. With the composition of the soft layer fiber felt, the PE air-permeating sound-absorbing membrane, and the hard layer fiber felt with different densities, an automobile sound insulation pad with a better acoustic performance can be obtained.