Process for producing an energy absorbing panel

B - Operations – Transporting – 32 – B

Patent

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B32B 5/18 (2006.01) B29C 44/12 (2006.01) F16F 9/30 (2006.01) B29C 67/22 (1990.01)

Patent

CA 2115552

2115552 9303910 PCTABS00020 A process for producing an energy absorbing panel having at least one energy absorbing surface in a mold comprising an upper mold and a lower mold. The process comprising placing a reinforcing layer in at least one of the upper mold and the lower mold. A liquid foamable polyurethane composition is then dispensed in the lower mold. The upper mold and lower mold are closed to define an enclosure corresponding substantially to the energy absorbing panel, the liquid foamable polyurethane composition is expanded to fill substantially the enclosure to produce a resilient polyurethane foam core which adheres to the reinforcing layer thereby providing an energy absorbing surface. The reinforcing layer has a tensile strength greater than the tensile strength of the resilient polyurethane foam core. Upon compression of the panel at the energy absorbing surface to about 50 % by volume of the uncompressed panel in a direction substantially normal to the reinforcing layer, the panel recovers to at least about 90 % of volume of the uncompressed panel in less than about 30 minutes. The panel has widespread utility and is particularly useful in vehicular applications.

Procédé concernant la production d'un panneau amortisseur, doté d'un moins une surface absorbant l'énergie, dans un moule comprenant deux parties inférieure et supérieure. Le procédé consiste à placer une couche de renfort dans au moins une des deux parties de moule supérieure ou inférieure. On introduit alors dans la partie de moule inférieure un liquide contenant du polyuréthane transformable en mousse. Les parties de moule supérieure et inférieure sont alors fermées, délimitant un espace correspondant pratiquement au panneau amortisseur. Le polyuréthane liquide moussant est alors expansé et remplit cet espace pour donner un noyau résistant de mousse de polyuréthane qui adhère à la couche de renfort, ce qui fournit ainsi une surface amortissante. La couche de renfort offre une résistance à la traction supérieure à celle du noyau élastique en mousse de polyuréthane. Après compression du panneau sur sa surface amortissante à environ 50 % de son volume initial dans une direction relativement perpendiculaire à la couche de renfort, le panneau reprend au moins 90 % dudit volume initial en moins de 30 minutes. Ce panneau trouve des usages variés, en particulier dans la construction de véhicules.

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