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US 12,059,882 B2Granted
Dash isolation pad
AssigneesHyundai Motor Company, Kia Corporation, Seoyon E-Hwa Co., Ltd.
InventorsJungwook Lee, Ji Wan Kim, Wenxu Huang, Xiaoqin Zheng, Hyun-Joon Park
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Abstract
An embodiment dash isolation pad includes a 3D vertical nonwoven fabric layer having a structure in which wave-type short fibers are vertically arranged, a sound absorption layer on one side or both sides of the 3D vertical nonwoven fabric layer, and an olefin-based powder layer between the 3D vertical nonwoven fabric layer and the sound absorption layer.
Claims20
A dash isolation pad comprising:
- a 3D vertical nonwoven fabric layer having a structure in which wave-type short fibers are vertically arranged;
- an upper sound absorption layer on an upper side of the 3D vertical nonwoven fabric layer;
- a lower sound absorption layer on a lower side of the 3D vertical nonwoven fabric layer;
- an upper olefin-based powder layer between the 3D vertical nonwoven fabric layer and the upper sound absorption layer;
- and
- a lower olefin-based powder layer between the 3D vertical nonwoven fabric layer and the lower sound absorption layer, wherein a weight ratio of the upper olefin-based powder layer is 0.8 to 0.9 based on a total weight of the upper olefin-based powder layer and the lower olefin-based powder layer.
3 more elements
A dash isolation pad comprising:
- a 3D vertical nonwoven fabric layer having a structure in which wave-type short fibers are vertically arranged;
- an upper sound absorption layer on an upper side of the 3D vertical nonwoven fabric layer, the upper sound absorption layer comprising a fiber board or needle punching nonwoven fabric, wherein an area density of the upper sound absorption layer is 100 g/m2 or less and wherein the upper sound absorption layer comprises a low melting fiber of 20% or more;
- a lower sound absorption layer on a lower side of the 3D vertical nonwoven fabric layer, the lower sound absorption layer comprising a fiber board or needle punching nonwoven fabric, wherein an area density of the lower sound absorption layer is 100 g/m2 or less and wherein the lower sound absorption layer comprises a low melting fiber of 20% or more;
- an upper olefin-based powder layer between the 3D vertical nonwoven fabric layer and the upper sound absorption layer, the upper olefin-based powder layer comprising a polyethylene (PE) powder layer;
- and
- a lower olefin-based powder layer between the 3D vertical nonwoven fabric layer and the lower sound absorption layer, the upper olefin-based powder layer comprising a PE powder layer, wherein a weight ratio of the upper olefin-based powder layer is 0.8 to 0.9 based on a total weight of the upper olefin-based powder layer and the lower olefin-based powder layer.
3 more elements
A dash isolation pad comprising:
- a 3D vertical nonwoven fabric layer having a structure in which wave-type short fibers are vertically arranged, wherein an area density of the 3D vertical nonwoven fabric layer is 500 g/m2 or more;
- an upper sound absorption layer on an upper side of the 3D vertical nonwoven fabric layer, wherein the upper sound absorption layer comprises a polyethylene terephthalate felt layer having an area density of 500 g/m2 or more;
- a lower sound absorption layer on a lower side of the 3D vertical nonwoven fabric layer, wherein the lower sound absorption layer comprises a polyethylene terephthalate felt layer having an area density of 100 g/m2 or less;
- an upper olefin-based powder layer between the 3D vertical nonwoven fabric layer and the upper sound absorption layer;
- and
- a lower olefin-based powder layer between the 3D vertical nonwoven fabric layer and the lower sound absorption layer, wherein a weight ratio of the upper olefin-based powder layer is 0.8 to 0.9 based on a total weight of the upper olefin-based powder layer and the lower olefin-based powder layer.
3 more elements
Dependencies are inferred from the claim text.