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Thermosensitive label and methods of preparing and using the thermosensitive label

  • US 9,744,742 B2
  • Filed: 12/16/2013
  • Issued: 08/29/2017
  • Est. Priority Date: 12/24/2012
  • Status: Active Grant
First Claim
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1. A thermosensitive label for monitoring the quality state of a thermosensitive article, comprising two laminated portions of a thermosensitive function layer and an adsorption-indication function layer, which are physically independent of each other before use, whereinthe thermosensitive function layer comprises:

  • a sealing film;

    a first substrate material layer on the sealing film, wherein the first substrate material layer is made of white paper, copy paper, or printing paper;

    a volatile dye layer formed on the first substrate material layer, wherein the difference between an activation energy of a volatilization process of the volatile dye layer and that of a quality deterioration process of the thermosensitive article is within a predetermined range, and wherein the volatile dye layer is formed by coating or impregnating the first substrate material layer with a volatile dye; and

    a first release film layer, which covers the volatile dye layer, wherein the sealing film and the first release film layer are larger than the volatile dye layer in dimension, and the volatile dye layer is sealed between the sealing film and the first release film layer,andthe adsorption-indication function layer comprises;

    a second substrate material layer, which is made of transparent material;

    a reference indication layer, which is located above the second substrate material layer and has an observation window around which a reference colour is present;

    an adsorption material layer, which is located under the second substrate material layer and is able to adsorb a volatile dye from the volatile dye layer, wherein the adsorption material layer is overlapped or aligned with the observation window in a vertical direction;

    an isolation layer made of opaque material and located under the adsorption material layer, wherein the isolation layer is larger than the observation window in dimension, and larger than or equal to the volatile dye layer in dimension and the volatile dye is able to diffuse through the isolation layer; and

    a second release film layer, which covers the isolation layer.

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