{
  "$type": "site.standard.document",
  "description": "An ultra light, noise reducing composite 1 comprises an acoustically transparent, light weight film 6 between a foamed backing layer 5 and an air flow resistance layer 4. This composite allows to easily tune the acoustic properties by balancing of the absorption and sound transmission behaviour of…",
  "path": "/patents/1086376",
  "publishedAt": "2004-06-16T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B32B27/065",
    "RIETER TECHNOLOGIES A G [CH]"
  ],
  "textContent": "An ultra light, noise reducing composite 1 comprises an acoustically transparent, light weight film 6 between a foamed backing layer 5 and an air flow resistance layer 4. This composite allows to easily tune the acoustic properties by balancing of the absorption and sound transmission behaviour of the composite1. This air flow resistance layer 4 has an air flow resistance of between 500Ns/m and 2500Ns/m and an area mass between 200 g/m2 and 1600 g/m2. The foamed backing layer 5 has a stiffness value in the range between 100 Pa and 100'000 Pa. The light weight film 6 consists of a PVOH foil or a PE/PA dual layer foil and has a thickness of 0.01 mm.",
  "title": "Ultralight trim composite"
}