Foam-paperboard laminates, articles incorporating same and...

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/32 (2006.01) B32B 27/10 (2006.01)

Patent

CA 2611417

The present invention relates to foam-paperboard laminates (foam-paperboard laminates) prepared using an in situ foaming process. The foam-paperboard laminates of the present invention are formed by extruding LDPE polymer onto a moisture containing paperboard to provide a LDPE-coated paperboard material. Upon heating of the LDPE-coated paperboard, the moisture in the paperboard causes steam to act as a blowing agent for the LDPE and a LDPE foam is obtained. The foam is adhered to the paperboard by way of physical adhesion of the polymer to the paperboard. The foam-paperboard laminates of the present invention exhibit insulating and cushioning properties. The foam-paperboard laminates are suitable for use, for example, in insulating beverage cups, food service containers, packaging material, and in other products where laminates can be useful.

L'invention concerne des stratifiés de carton alvéolaire obtenus par un procédé de gonflement in situ. Les stratifiés de carton alvéolaire de l'invention sont obtenus par extrusion de polymère LDPE sur un carton humide de façon à former un matériau en carton enduit de LDPE. Lorsque le carton enduit de LDPE est chauffé, l'humidité contenue dans le carton amène la vapeur à agir comme gonflant sur le LDPE, ce qui permet d'obtenir un matériau alvéolaire de LDPE. Le matériau alvéolaire est collé au carton par collage physique du polymère au carton. Les stratifiés de carton alvéolaire de l'invention présentent des propriétés d'isolation et de calage. Ils peuvent être utilisés, par exemple, dans les gobelets isothermes pour boissons, les contenants de restauration, les matériaux d'emballage, ainsi que dans d'autres produits où les stratifiés peuvent être utiles.

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