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Older adults and children may not check the expiration.It can lead to food poisoning.The expi.alarm is an expiration date alarm that indicate the time of expiration by written notification on the it's body .The concept is based on the nature of pH-sensitive materials. PH-sensitive polymers are materials that change in volume when the pH of the surrounding medium changes .This material cut off to shape the word "expired" and embeded in a normal package so that it is in contact with the contents of the package.At the time of expiration,ph sensitive material respond to change of pH and the "expired" notification appear on package.
Art and Architecture University
Tehran Central Branch
Saba Sabur Sadeghzadeh Mahsa Haghipanah