发明名称 |
Time-temperature indicator device and method of manufacture |
摘要 |
A time-temperature indicator label for measuring the length of time to which a product has been exposed to a temperature above a pre-determined temperature is provided. The period of time of exposure is integrated with the temperature to which the indicator is exposed. The label is a composite of a plurality of layers adapted to be adhered at its underside to a product container. The label includes a printable surface layer, a longitudinal wicking strip that is adhered underneath the surface layer substantially at the opposite extremities only of the wicking strip and a lower substrate layer forming an envelope with said surface layer. A heat-fusible substance, which melts and flows above a pre-determined temperature, is applied on the surface of the wicking strip contiguous to at least one of the ends of the wicking member. When the heat-fusible substance is exposed to a temperature above the pre-determined temperature, the heat-fusible substance flows along the length of the wicking member. The label has a printable surface layer and is sealed at its peripheral edge to the peripheral edge of the substrate layer. These layers encapsulate the wicking member and the heat-fusible substance. The surface layer is provided with a sight window at an intermediate location over the wicking member through which the progress of flow on the wicking member is observed.
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申请公布号 |
US6042264(A) |
申请公布日期 |
2000.03.28 |
申请号 |
US19970976260 |
申请日期 |
1997.11.21 |
申请人 |
LIFELINES TECHNOLOGY, INC. |
发明人 |
PRUSIK, THADDEUS;ARNOLD, RAYMOND M.;FIELDS, STEPHEN C. |
分类号 |
G01K3/04;(IPC1-7):G01K3/04;G01K1/14;G01K11/06;G01K13/00 |
主分类号 |
G01K3/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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