Lidstock laminate

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/00 (2006.01) B32B 27/08 (2006.01) B65D 65/40 (2006.01) B65D 77/20 (2006.01)

Patent

CA 2440723

A packaging laminate useful as a lidstock comprises first and second films, and an image between the first and second films. The first film comprises a sealant layer forming the inside surface of the first film. The first film has a free shrink at 220~ F (104~ C)in at least one direction of at least about 7 %. The second film comprises an outside layer forming the outside surface of the second film. The outside layer comprises at least about 40 % by weight of the outside layer of one or more relatively high-melt polymers each having a melting point at least about 25~ F (ca. 10~ C) higher than the lowest melting point polymer of the sealant layer. The second film has a free shrink at 185~ F (85~ C) of no more than about 10 % in each of the machine and transverse directions. The outside surface of the first film is directly laminated to the inside surface of the second film. The first film has an oxygen transmission rate greater than the oxygen transmission rate of the second film. The laminate has an oxygen transmission rate of no more than about l00 cubic centimeters.

L'invention concerne un stratifié d'emballage qui peut servir de matériau d'operculage et qui comprend un premier film et un second film ainsi qu'une image intercalée entre le premier film et le second film. Le premier film comprend une couche de scellement qui constitue la surface intérieure du premier film. Le premier film présente une rétraction libre d'au moins environ 7 % à 220· F (104· C) dans au moins un sens. Le second film comprend une couche extérieure qui constitué la surface extérieure du second film. La couche extérieure comprend au moins environ 40 % en poids de la couche extérieure d'un ou plusieurs polymères dont le point de fusion relativement élevé se situe à au moins environ 25· F (ca. 10· C) de plus que le polymère ayant le point de fusion le plus bas de la couche de scellement. Le second film présente une rétraction libre à 185· F (85· C) qui ne dépasse 10 % dans le sens machine et dans le sens transversal. La surface extérieure du premier film est directement laminée sur la surface intérieure du second film. Le premier film présente un taux de transmission à l'oxygène supérieur au taux de transmission à l'oxygène du second film. Le stratifié présente un taux de transmission à l'oxygène qui ne dépasse pas environ 100 cm?3¿.

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