Package lid, method for manufacturing the same and package...

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/10 (2006.01) B65D 77/20 (2006.01)

Patent

CA 2463683

The invention relates to a lid (1) that can be heat-sealed to the opening of a package (2) and peeled off as the package is opened. In addition, the invention comprises methods for manufacturing such a lid and a package sealed with the lid, and also a sealed package equipped with a lid. The lid (1) consists of a fibrous material layer (6), whichmay be paper or cardboard, a polymer oxygen-barrier layer (7), suitable materials of which are polyethylene terephthalate (PET), ethylene vinyl alcohol copolymer (EVOH) or polyamide (PA), and a polymer heat-seal layer (8). In accordance with the invention, the heat-seal layer (8) combines ethylene methyl acrylate copolymer (EMA), ethylene vinyl acetate copolymer (EVA) and polyamide wax, adherence of the heat-seal layer directly to the oxygen-barrier layer (7) having been allowed without any intermediate binder. During the manufacture of the lid, the oxygen- barrier and heat-seal layers (7, 8) can be applied onto paper or cardboard by coextrusion. The packages equipped with a lid in accordance with the invention comprises boxes, cups or goblets, for instance, into which foodstuffs, such as drinks, nutrients fats or ready-made foods have been packaged.

L'invention concerne un couvercle (1) thermoscellable sur l'ouverture d'un emballage (2) et pelable lors de l'ouverture de cet emballage. L'invention se rapporte également à des procédés de production d'un tel couvercle et d'un emballage fermé hermétiquement à l'aide d'un tel couvercle, ainsi qu'à un emballage fermé hermétiquement pourvu d'un tel couvercle. Ce couvercle (1) comprend une couche de matière fibreuse (6) telle que du papier ou du carton, une couche polymère faisant barrière à l'oxygène (7), les matériaux adéquats pouvant être du polyéthylène téréphtalate (PET), un copolymère éthylène-alcool vinylique (EVOH) ou un polyamide (PA), ainsi qu'une couche polymère de thermoscellage (8). Selon l'invention, cette couche de thermoscellage (8) contient de manière combinée un copolymère éthylène-acrylate de méthyle (EMA), un copolymère éthylène-vinylacétate (EVA) et une cire polyamide, l'adhérence de la couche de thermoscellage sur la couche faisant barrière à l'oxygène (7) s'effectuant directement sans l'aide d'un liant intermédiaire. Au cours du processus de fabrication dudit couvercle, la couche faisant barrière à l'oxygène (7) et la couche de thermoscellage (8) peuvent être appliquées sur du papier ou du carton par coextrusion. Parmi les emballages pourvus d'un couvercle selon l'invention figurent par exemple des boîtes, tasses ou gobelets pouvant contenir des denrées alimentaires telles que des boissons, matières grasses nutritives ou aliments prêts à consommer.

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