Time-temperature indicators

A technology of indicators and objects, applied in the field of temperature indicators
CN101258388AInactive Publication Date: 2008-09-03AUSTRALIEN NAT UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
AUSTRALIEN NAT UNIV
Publication Date
2008-09-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention provides a visual thermal history indicator comprising a pattern produced from at least two waxes wherein one wax has a melting point that differs from the other wax, or where the waxes have the same melting point but different melt flow behaviour, and wherein the pattern is adapted so that when the lower melting point wax melts or the wax with greater melt flow behaviour flows, the visual appearance of the pattern changes, and wherein when the second and subsequent higher melting waxes melt, or when the lower melt flow behaviour waxes flow, the visual appearance of the pattern changes as each wax melts or flows.
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Description

technical field

[0001] The present invention relates to a temperature indicator which can be applied directly or indirectly by deposition on the packaging of perishable or heat-sensitive products. The temperature indicators are formed from wax-based inks and can additionally be applied directly or indirectly to the product by deposition to provide information about the thermal history of the product. Background technique

[0002] It is desirable to provide an indication of whether a product has been exposed to an undesirable time-temperature history. This applies to perishable items such as food and medicine. These products generally have a limited useful life, which may be significantly shortened by exposure to relatively high temperatures for a specified period of time during storage, distribution or use.

[0003] It may also find application when a predetermined time-temperature history is required during processing or use of the product. It also concerns certain produ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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