Patent ID: 11881198
Assignee: KOTOBUKIYA FRONTE CO., LTD.
Field: Transport (Mechanical engineering)
Classification: CPC G  B | IPC B  G

Claim 0:
1. A sound-insulation material for a vehicle, having a multilayer structure, the material comprising:
a hard layer having tubular cells, the tubular cells being arranged in a plurality of rows wherein each of the cells in the hard 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 hard layer such that rows of the open ends of the cells are in every other row; and
a soft layer provided on one side of the hard layer,
wherein the closed surfaces of the cells arranged in every other row serve as a surface for adhering the soft layer and the hard layer,
wherein a ratio of a dynamic spring constant Kd to a static spring constant Ks, of a structure having the hard layer and the soft layer, is 0<Kd/Ks≤1.5.