US 12,441,093 B2
Vehicular interior material and seat back panel
Kazuki Fukui, Gyoda (JP)
Assigned to KOTOBUKIYA FRONTE CO., LTD., Tokyo (JP)
Appl. No. 18/015,564
Filed by KOTOBUKIYA FRONTE CO., LTD., Tokyo (JP)
PCT Filed Dec. 13, 2021, PCT No. PCT/JP2021/045748
§ 371(c)(1), (2) Date Jan. 11, 2023,
PCT Pub. No. WO2022/138265, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 2020-212874 (JP), filed on Dec. 22, 2020.
Prior Publication US 2023/0311459 A1, Oct. 5, 2023
Int. Cl. B32B 27/08 (2006.01); B32B 27/30 (2006.01)
CPC B32B 27/08 (2013.01) [B32B 27/304 (2013.01); B32B 2255/10 (2013.01); B32B 2255/26 (2013.01); B32B 2605/003 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A vehicle interior material which has a laminated structure of n layers (where, n is a natural number of 2 or more), the vehicle interior material comprising: at least,
a base material which is a first layer and which is formed of felt, foamed resin, or a hollow structure of resin; and
a cover layer which is an n-th layer, wherein,
the vehicle interior material is configured to satisfy a relationship of Formula (1):

OG Complex Work Unit Math
where, among the first to the n-th layers, the thickness of an i-th layer is di (mm), the Young's modulus of the i-th layer is Ei (MPa), and the density of whole of the vehicle interior material is ρ (g/cm3).