Energy absorbing articles of extruded thermoplastic foams

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 44/46 (2006.01) B29C 43/02 (2006.01) B29C 44/22 (2006.01) B32B 5/18 (2006.01) B32B 5/32 (2006.01) B60R 19/22 (2006.01) B60R 21/04 (2006.01) C08J 9/14 (2006.01) F16F 7/00 (2006.01) B29C 43/18 (2006.01)

Patent

CA 2295103

An energy absorbing article having a direction in which impact resistance is desired is formed of extruded thermoplastic foam exhibit anisotropic compressive strength. The extrusion direction of the thermoplastic foam is aligned substantially parallel with the direction in which impact resistance is desired to provide an energy absorbing article exhibiting a high ratio of compressive strength to weight. In accordance with a particular aspect of this invention, the thermoplatic foams may be prepared by the extrusion foaming of a molten thermoplastic composition utilizing a die including a mulitiplicity of orifices. In additon to coextrudates comprising coalescend strand foams having foam strands of two or more different densities, the extruded thermoplastic foams exhibiting antisotropic strength properties which may be utilized in accordance with the principles of this invention include coextrudates including foam strands and a unitary (integral piece) interleaving profile of an unfoamed thermoplastic.

L'invention concerne un article amortisseur qui présente un sens de résistance à des impacts voulu. L'article est formé en une mousse thermoplastique extrudée qui présente une force de compression anisotrope. Le sens d'extrusion de la mousse thermoplastique est sensiblement parallèle au sens dans lequel on veut obtenir une résistance à des impacts, pour permettre de former un article amortisseur présentant un rapport élevé force de compression/poids. Selon un aspect particulier de l'invention, les mousses thermoplastiques peuvent être préparées au moyen d'une expansion par extrusion d'une composition thermoplastique fondue, à l'aide d'une filière comportant de multiples orifices. Les mousses thermoplastiques extrudées comportent des coextrudats, notamment des mousses à fils de base coalescents qui présentent des fils de base de mousse de deux ou davantage de densités différentes; outre ces coextrudats, les mousses thermoplastiques extrudées qui possèdent des propriétés de force anisotrope, et peuvent être utilisées conformément aux principe de l'invention comportent des coextrudats présentant des fils de base de mousse et un profil d'enchevêtrement unitaire (d'une seule pièce) d'un thermoplastique non expansé.

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