production method of sound-absorbing material having helmholtz resonance hole capable of ultrasound absorption and sound-absorbing material thereof

摘要

The present invention comprises a neck portion of the tubular having the, cylindrical hollow portion and the connection with the cavity and a small flat section than critically area the joint portion of the feature relates to a sound-absorbing material production method having the Helmholtz 0 people hole absorption of ultrasound possible in the sound-absorbing material production method having the Helmholtz 0 people holes, picture through a lithographic process and a cavity part pattern corresponding to the cavity shape on one surface of the substrate is formed at an upper portion of the cavity pattern a neck portion pattern corresponding to the neck-shaped the embossed pattern of the Helmholtz 0 people hole structure including the stamping step and the plurality of embossed patterns to form a primary mold spaced apart a predetermined interval to the Helmholtz 0 people hole on one side to form a sound-absorbing layer of the film type formed spaced interval schedule step and forming the bonding layer of the film type based on the one surface of the sound-absorbing layer Comprising, wherein the plurality of embossing patterns may be formed so as to have a volume of micros or less. According to the present invention as described above, picture as produced because of the mold base produced through a lithographic process in a simple operation step for stamping the surface of the polymer film type as to be relatively simple to this production costs are significantly reduced. Further, by adjusting the size of the embossed pattern of the basic mold, it is possible to manufacture a sound absorbing material capable of absorbing the ultrasonic waves of different frequency bands. In addition, because of the way that the sound absorption material produced by stamping the embossed pattern of the primary mold to the surface of the polymer film type can be mass-produced.;