초록 ▼

A time-temperature indicator device provides a visually observable indication of the cumulative thermal exposure of an object. The device includes a substrate having a diffusely light-reflective porous matrix and a backing. The backing includes on its surface a viscoelastic indicator material for co

A time-temperature indicator device provides a visually observable indication of the cumulative thermal exposure of an object. The device includes a substrate having a diffusely light-reflective porous matrix and a backing. The backing includes on its surface a viscoelastic indicator material for contacting the substrate and a barrier material for substantially inhibiting the lateral and longitudinal flow of viscoelastic indicator material between the substrate and the backing.

대표청구항 ▼

1. A time-temperature integrating indicator device for providing a visually observable indication of the cumulative thermal exposure of an object, said device comprising:(a) a substrate having a diffusely light-reflective porous matrix; and (b) a backing including on its surface a viscoelastic indic

1. A time-temperature integrating indicator device for providing a visually observable indication of the cumulative thermal exposure of an object, said device comprising:(a) a substrate having a diffusely light-reflective porous matrix; and (b) a backing including on its surface a viscoelastic indicator material for contacting said porous matrix, and a barrier material for substantially inhibiting the lateral and longitudinal flow of viscoelastic material regardless of whether the indicator device is in an activated state or unactivated state; wherein the device is in the unactivated state when the viscoelastic indicator material is out of contact with the porous matrix; and wherein the device is in the activated state when the viscoelastic indicator material is in contact with the porous matrix such that the viscoelastic indicator material migrates into the porous matrix at a rate that increases with increasing temperature, thereby creating a visually observable indication of cumulative thermal exposure.