Patent ID: 11872944
Assignee: KOTOBUKIYA FRONTE CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC B  G | IPC B  G

Claim 0:
1. A sound-insulation material for a vehicle, having a multilayer structure, the material comprising:
a core layer having tubular cells, the tubular cells being arranged in a plurality of rows wherein each of the cells in the core layer has a closed surface at one end and an open end at another end, and the open ends of the cells are arranged on both sides of the core layer such that rows of the open ends of the cells are in every other row;
a first airflow-blocking resin film layer provided on at least one surface of the core layer, the first airflow-blocking resin film layer is non-apertured; and
a decoupling layer provided on a surface of the first airflow-blocking resin film layer, the surface being opposite to the core layer,
wherein the closed surfaces of the cell arranged in every other row serve as a surface for adhering the first airflow-blocking resin film layer and the core layer, and;
wherein an average specific acoustic impedance ratio is 2.8<(P/v)/Za<10 between 500 Hz and 6400 Hz, where P and v are respectively a sound pressure and a particle velocity on a surface of the first airflow-blocking resin film layer provided on the core layer, the surface being opposite to the core layer, and Za is an acoustic impedance of the decoupling layer.