{
  "$type": "site.standard.document",
  "coverImage": {
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    "ref": {
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  "description": "A sound-insulation material for a vehicle has high rigidity and is capable of exhibiting sufficient sound insulation performance against noise having a frequency of 500 Hz to 5000 Hz generated in a vehicle, while maintaining low weight. The sound-insulation material for a vehicle of the present…",
  "path": "/patents/1418659",
  "publishedAt": "2025-07-02T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60R13/0815",
    "KOTOBUKIYA FRONTE CO LTD [JP]"
  ],
  "textContent": "A sound-insulation material for a vehicle has high rigidity and is capable of exhibiting sufficient sound insulation performance against noise having a frequency of 500 Hz to 5000 Hz generated in a vehicle, while maintaining low weight. The sound-insulation material for a vehicle of the present invention has a multilayer structure, the material including: a hard layer 10 having tubular cells, the tubular cells being arranged in a plurality of rows; and a soft layer 30 provided on one surface of the hard layer, in which a ratio of a dynamic spring constant Kd to a static spring constant Ks, of a structure having the hard layer 10 and the soft layer 30, is 0 < Kd/Ks ≤ 1.5.",
  "title": "NOISE INSULATION MATERIAL FOR AUTOMOBILE"
}