Method and indicator for indicating thawing

G - Physics – 01 – K

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Details

G01K 11/06 (2006.01) G01K 3/04 (2006.01) F25D 29/00 (2006.01)

Patent

CA 2260184

A method of indicating whether a food article has undergone a freeze-thaw sequence by applying to the food article an indicator including a first material (3) enclosed within microcapsule walls (4), and a second material (5) normally separated from the first material by the microcapsule walls. The two materials include substances which produce a color change when brought into contact with each other, but which are normally separated from each other by the microcapsule walls. The first material further includes a liquid, preferably water, which when frozen expands sufficiently to rupture the microcapsule walls (Fig. 26), such that when the first material is thawed, it comes into contact with the second material producing a color change indicating that the food article has undergone a freeze-thaw sequence.

La présente invention concerne un procédé permettant d'indiquer si un article alimentaire a subi une séquence gel-dégel, et consistant à appliquer sur l'article alimentaire un indicateur comportant un premier matériau (3) enfermé entre des parois en microcapsules (4) et un second matériau (5) séparé habituellement du premier matériau par lesdites parois en microcapsules. Les deux matériaux contiennent des substances qui, lorsqu'elles se rencontrent, produisent un changement de couleur, étant toutefois normalement séparées les unes des autres par les parois en microcapsules. Le premier matériau possède de surcroît un liquide, de l'eau de préférence qui, lorsqu'elle gèle se gonfle suffisamment pour rompre les parois en microcapsules (figure 26). De ce fait, lorsque le premier matériau a subi un cycle gel-dégel, il entre en contact avec le second matériau produisant ce changement de couleur indiquant que l'article alimentaire a fait l'objet d'une séquence gel-dégel.

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