Energy absorbing member

Details Energy absorbing member Energy absorbing member

B - Operations, Transporting

29

C

B29C 43/00 (2006.01) B29C 44/00 (2006.01)

Patent

CA 2687833

An improved energy absorbing member comprising, an thermoplastic cellular polymer in contact with a structural element such as a metal guard rail or automotive door, wherein the cellular polymer has an average cell size of at least about 0.75 mm and at least one of CE/CT, CV/CT and CH/CT is about 0.25 to about 0.4 said one of CE/CT, Cv/C.tau. and CH/CT having a compressive efficiency of at least 70% at a 60% strain, CE, Cv and CH being the compressive strength of the cellular polymer in each of three orthogonal directions E, V and H where one of these directions is the direction of maximum compressive strength in the foam and Cx equals the sum of CE, Cv and CH.

L'invention concerne un élément d'absorption d'énergie amélioré comprenant un polymère cellulaire thermoplastique en contact avec un élément structurel comme une glissière de sécurité en métal ou une porte d'automobile. Le polymère cellulaire présente une taille de cellule moyenne d'au moins environ 0,75 mm et au moins un élément parmi CE/CT, CV/CT, et CH/CT est d'environ 0,25 à environ 0,4, ledit élément parmi CE/CT, CV/C.tau., et CH/CT ayant une efficacité de compression d'au moins 70 % sous une tension de 60 %, CE, CV et CH étant la résistance à la compression du polymère cellulaire dans chacune des trois directions orthogonales E, V et H, où l'une de ces directions est la direction de résistance à la compression maximale dans la mousse et CX est égal à la somme de CE, CV et CH.

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