申请人:Maurer J. Myron
公开号:US20060148919A1
公开(公告)日:2006-07-06
Cushions for dynamic impact applications include anisotropic cellular polymers made in an extrusion, expanded bead or reactive foaming process. The anisotropic behavior represented by C
E
/C
T
, C
V
/C
T
and C
H
/C
T
, wherein C
E
, C
V
and C
H
represent the compressive strength of the cellular polymer in each of three orthogonal directions E, V and H, respectively, as measured by compressing a 25-50 mm thick sample of the cellular polymer at a strain rate of 0.08 s
−1
to 25% strain, C
T
represents the sum of C
E
, C
V
and C
H
, and at least one of C
E
/C
T
, C
V
/C
T
and C
H
/C
T
has a value of at least 0.40, up to about 0.80. The cellular polymer also preferably has density of 1.75 to 2.35 pounds/cubic foot and a compressive stress in the direction of maximum compressive strength of 290-600 kPa at 25% strain when used for headliner countermeasure applications. The cushions are useful in automotive applications such as automotive headliners, door panels, knee bolsters, pillars, headrests, seat backs, load floors or instrument panels.
用于动态冲击的缓冲材料包括各向异性的蜂窝聚合物,它们是通过挤压、发泡或反应发泡工艺制成的。各向异性行为由 C
E
/C
T
, C
V
/C
T
和 C
H
/C
T
其中 C
E
, C
V
和 C
H
分别代表蜂窝聚合物在 E、V 和 H 三个正交方向上的抗压强度,测量方法是以 0.08 秒-1 的应变速率压缩 25-50 毫米厚的蜂窝聚合物样品。
-1
至 25% 应变,C
T
代表 C
E
, C
V
和 C
H
中的至少一个
E
/C
T
, C
V
/C
T
和 C
H
/C
T
值至少为 0.40,最高约为 0.80。蜂窝聚合物的密度最好为 1.75 至 2.35 磅/立方英尺,用于顶蓬对策时,最大压缩强度方向的压缩应力在 25% 应变时为 290-600 千帕。这种垫子可用于汽车顶篷、门板、膝部支撑、支柱、头枕、座椅靠背、承载地板或仪表板等汽车应用中。