Barrier materials and products produced therewith

Details Barrier materials and products produced therewith Barrier materials and products produced therewith

G - Physics

01

K

G01K 3/04 (2006.01)

Patent

CA 2318285

A marking element (1) for indicating whether a pre-defined temperature condition has been maintained. The element comprises a first material (7) capable of flowing above a predetermined temperature separated from a second absorbent material (5, 10) by a heat disruptable barrier layer (4). The first and second materials are such that when the barrier layer is punctured and the predetermined temperature is exceeded the first material flows in the second material to produce a detectable change. The heat disruptable barrier layer (4) is comprised of a heat disruptable material (8) associated with an element (9) capable of being inductively heated by electromagnetic energy to effect disruption of said material thereby to activate the marking element.

L'élément indicateur décrit (1) indique si des conditions prédéterminées de température ont été maintenues. L'élément comprend un premier matériau (7) qui peut fondre au-dessus d'une température prédéterminée et qui est séparé d'un deuxième matériau absorbant (5, 10) par une couche formant barrière (4) thermodestructible. Lorsque la couche formant barrière est perforée et que la température monte au-dessus de la température prédéterminée, le premier matériau s'écoule dans le deuxième matériau et produit un changement détectable. La couche formant barrière thermodestructible (4) comprend un matériau thermodestructible (8) associé à un élément (9) qui peut être chauffé par induction par apport d'énergie électromagnétique afin de provoquer la destruction dudit matériau et d'activer l'élément indicateur.

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