| 摘要 |
PROBLEM TO BE SOLVED: To surely and easily detect the temperature history for whether the storage temperature has become an inappropriate high-temperature state that would cause quality degradation of products during storage/holding of foods, or the like, whose suitable storage temperature range is about -10 to +10°C. SOLUTION: This temperature history indicator has an oxygen detecting agent discoloring, according to oxygen concentration and a packaging film of fine gas permeability for sealing and covering an oxygen detecting agent body. Preferably, the packaging film has oxygen permeability 0.1-50 ml/m<SP>2</SP>day at a temperature of 25°C. The packaging film may be a laminated film, formed by stacking two or more kinds of films made of any polymer selected from among polyethylene terephthalate (PET), polyacrylonitrile (PAN), polyamide (NY), and polyethylene (PE), and may be extended two-axially. The indicator further may have a color sample that shows the relation between temperature and color tone variation with time. COPYRIGHT: (C)2008,JPO&INPIT
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