Memory molded, high strength polystyrene

B - Operations – Transporting – 32 – B

Patent

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B32B 5/18 (2006.01) B29C 44/06 (2006.01) B29C 44/24 (2006.01) B29C 44/56 (2006.01) B29C 67/20 (2006.01) B32B 7/02 (2006.01) C08J 9/228 (2006.01)

Patent

CA 2226912

An expanded, memory molded, increased density, highly impact-resistant polystyrene construct, and method of making the construct. The construct is formed by molding pre-expanded non-equilibrated polystyrene beads to a first volume, cooling rapidly, and then compression molding to a final, smaller volume. The resultant constructs have increased density, and high impact strength without increase in embrittlement. The construct (L) may be multilayered with each layer (11, 12, 13) having a different density. Also, the construct has "memory" in the sense that it returns substantially to its original shape after impact.

L'invention porte sur un produit composite constitué de polystyrène expansé, moulé de manière à conserver une mémoire de forme, de densité renforcée, et très résistant à l'impact. Ledit produit est obtenu par moulage de perles de polystyrène pré-expansées, non équilibrées à un premier volume, à les refroidir rapidement, puis à les mouler sous pression jusqu'à un volume final moindre. Le produit résultant présentera une densité accrue et une forte résistance à l'impact sans toutefois devenir plus fragile. Le produit obtenu est un produit multicouche, et chaque couche (11, 12, 13) a une densité différente. Il comporte de plus une mémoire en ce sens qu'il reprend sensiblement sa forme originale après un impact.

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