Doneness indicator for heat-in packaging and method of...

B - Operations – Transporting – 65 – D

Patent

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B65D 81/34 (2006.01)

Patent

CA 2760860

A heat-in package with doneness indicator for heating applications, such as microwave heating of foods or sterilization applications. The doneness indicator comprises indicia printed with thermochromatic ink on the heat-in packaging. The doneness indicator can be sealed from front to back on the heat-in packaging in such a way that the heat transfer to the sealed area is controlled so that the contents contained within the heat-in packaging has adequate time to heat before a color change or other visual transformation is observed in the doneness indicator. Furthermore, the sealed area containing the thermochromatic ink is not in direct contact with the contents within the packaging. The ink changes due to heat conduction through the film. A venting system can further be incorporated to prevent excessive pressure build-up within the packaging.

La présente invention concerne un emballage résistant à la chaleur à indicateur de cuisson pour des applications de chauffage, telles que des applications de réchauffage par micro-ondes de nourriture, ou de stérilisation. L'indicateur de cuisson comprend des index imprimés avec de l'encre thermochromatique sur l'emballage résistant à la chaleur. L'indicateur de cuisson peut-être scellé de l'avant à l'arrière sur l'emballage résistant à la chaleur, de manière à contrôler le transfert de chaleur vers la zone scellée afin de disposer du temps adéquat pour réchauffer le contenu de l'emballage résistant à la chaleur avant qu'un changement de couleur, ou une autre transformation visuelle, ne soit observé sur l'indicateur de cuisson. En outre, la zone scellée contenant l'encre thermochromatique ne se trouve pas en contact direct avec le contenu de l'emballage. L'encre change du fait de la conduction thermique à travers le film. Un système de ventilation peut en outre être incorporé pour empêcher l'accumulation d'une pression excessive dans l'emballage.

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