| 摘要 |
<p>Cushions for dynamic impact applications include anisotropic cellular polymers madein an extrusion, expanded bead or reactive foaming process. The anisotropic behaviorrepresented by CE/CT, CV/CTandCH/CT, wherein CE,CVand CHrepresent the compressive strength of the cellularpolymer in each of three orthogonal directions E, V and H,respectively, as measured by compressing a 25-50 mm thick sample of the cellularpolymer at a strain rate of 0.08 s-1 to 25 % strain, CTrepresents thesum of CE, Cv and CH,and atleast one of CE/CT,CV/CTand CH/CThasa value of at least 0.40, up to about 0.80. The cellular polymer also preferablyhas density of 1.75 to 2.35 pounds/cubic foot (28-35.2 KG/m3) and acompressive stress in the direction of maximum compressive strength of 290-600kPa at 25 % strain when used for headliner countermeasure applications. The cushionsare useful in automotive applications such as automotive headliners, door panels,knee bolsters, pillars, headrests, seat backs, load floors or inst rument panels.</p> |
