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    • 19. 发明授权
    • Temperature indicator for deep-frozen products
    • 冷冻产品温度指示器
    • US5490476A
    • 1996-02-13
    • US286253
    • 1994-08-08
    • Ronald J. VeitchHelmut JakuschPeter Heilmann
    • Ronald J. VeitchHelmut JakuschPeter Heilmann
    • G01K11/06G01K1/02G01K1/14
    • G01K11/06
    • An apparatus for checking deep-frozen food, which irreversibly indicates if an additional storage temperature has been exceeded, is described. A flat plastic bag having transparent walls, into which eutectic mixture having a liquid/solid phase transition in the range from 0.degree. to -50.degree. C. has been introduced, together with a magnetic dispersion consisting of finely divided magnetic pigments, has a heat-conducting connection to the material to be frozen. A magnetic stripe which contains a magnetically recorded pattern and which remains connected to the bag until the indicating apparatus together with the material to be frozen has been cooled below the limiting temperature is stuck to the bag. The magnetic stripe is then removed. If the permissible limiting temperature is exceeded, the optically or magnetically readable structure produced by the magnetic stripe in the indicator bag is eliminated, permitting easy checking of the deep-frozen food. The present invention permits many potential variations by combination of a plurality of applied magnetic stripes.
    • 描述了用于检查深冷食品的装置,其不可逆地指示是否超过额外的存储温度。 已经引入了具有透明壁的扁平塑料袋,其中具有在0至-50℃范围内的液/固相变的共晶混合物与由细分散的磁性颜料组成的磁性分散体一起具有热量 与要冷冻的材料进行连接。 包含磁记录图案并且保持连接到袋子直到指示装置与待冷冻材料一起被冷却到极限温度以下的磁条被卡在袋子上。 然后去除磁条。 如果超过允许的极限温度,则消除由指示袋中的磁条产生的光学或磁性可读结构,从而容易地检查深冷食品。 本发明通过组合多个施加的磁条允许许多潜在的变化。