Laminate packaging material

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 30/08 (2006.01) B32B 1/02 (2006.01) B32B 7/12 (2006.01) B32B 23/08 (2006.01) B32B 27/34 (2006.01) B32B 27/36 (2006.01) B65D 85/72 (2006.01) B65D 88/34 (2006.01)

Patent

CA 2372126

A laminate packaging material for use with food products, and a retortable pouch comprising that material, are disclosed. The laminate material includes an outer polyethylene terephthalate layer, a nylon second layer, and a polypropylene inner layer. A solventless adhesive is used to bond the layers together. The solventless adhesive includes surface-modified exfoliated montmorillonite clay platelets. The platelets lie generally parallel to the plane of the laminate, and overlap to form a barrier to oxygen and other volatile materials. The retortable pouch is formed by heat sealing the edges one of more sheets of the laminate such that the polypropylene layers face inward and are welded together. The pouch and its contents can then be pasteurized by heat-treatment without degradation of the laminate or the heat seal.

Un matériau d'emballage laminé pour produits alimentaires et un sachet stérilisable comprenant ce matériau sont révélés. Le matériau laminé comprend une couche extérieure de polyéthylène téréphtalate, une couche secondaire de nylon et une couche intérieure de polypropylène. Un adhésif sans solvant est utilisé pour lier les couches ensemble. L'adhésif sans solvant comprend des plaquettes d'argile montmorillonitique exfoliées et modifiées en surface. Les plaquettes se situent généralement en parallèle au plan du laminé, et se chevauchent pour former une barrière à l'oxygène et à d'autres matières volatiles. Le sachet stérilisable est formé en thermoscellant les bords d'une ou de plusieurs feuilles de laminé de telle sorte que les couches de polypropylène font face vers l'intérieur et sont fusionnées ensemble. Le sachet et son contenu peuvent alors être pasteurisés par traitement thermique sans dégradation du laminé ou du thermoscellage.

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