Abstract: A sound absorption sheet is constructed by both films which are made of a fire-retardant polyethylene resin and layered with each other. The film has a flat film portion and a large number of air bubble portions. The flat film portion is adhered at its rear face to the flat film from the side of the front face. A large number of air bubble portions are dispersed in a staggered arrangement with each other along the planar direction of the film and raised and formed cylindrically along the thickness direction of the flat film portion in a direction separating from the film.

Abstract: A sound absorption sheet is constructed by both films which are made of a fire-retardant polyethylene resin and layered with each other. The film has a flat film portion and a large number of air bubble portions. The flat film portion is adhered at its rear face to the flat film from the side of the front face. A large number of air bubble portions are dispersed in a staggered arrangement with each other along the planar direction of the film and raised and formed cylindrically along the thickness direction of the flat film portion in a direction separating from the film.

Abstract: A thin and light-weight automotive sound-absorbing material with a superior sound-absorbing property, which can be used, for example, for automotive insulator to keep the interior of an automobile quiet. This automotive sound-absorbing material has a laminate structure comprising a sound-absorbing layer, an intermediate layer, and a sound-absorbing layer. The intermediate layer comprises a film made of thermoplastic resin with a thickness of 10 to 100?, on which small pores are uniformly opened in such a manner that the aperture ratio would be 0.05 to 5%. The sound-absorbing layers comprise an aggregate of fibers such as felt, glass wool, etc. or porous synthetic resin layer, such as urethane foam, etc.