Patent ID: 11932178
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Surface technology, coating (Chemistry)
Classification: CPC B  F  G | IPC B  F  G

Claim 0:
1. A sound-absorbing material comprising:
a fiber layer including a plurality of holes open to a surface thereof and having a thickness of 3 mm or more; and
an inorganic material layer mainly containing a calcium-based material and having a thickness of 0.4 to 0.6 mm on the surface of the fiber layer,
the holes being blind holes each penetrating through the inorganic material layer and having a bottom inside the fiber layer,
each hole having a depth corresponding to 50 to 90% of the thickness of the fiber layer,
wherein, in a plan view of the sound-absorbing material, a shape and size of portions of the holes that penetrate the inorganic material layer is a same as a shape and size of portions of the holes in the fiber layer, and
each of the holes has the same shape and size.