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When the dairy products being stored in the refrigerator for long time, it expired and turned sour. Normally we need to smell or taste a bite to make sure if it is still safe to use. If there is a blockade line that shows the warning when opening the box, we can avoid having dairy products which already turned sour.Blockade is a warning design that utilizes the feature of adhesives by the time and temperature change. When the milk is exposed under normal temperature for too long, the open pocket of the milk box changes and shows a blockade to alert Blockade.
National Cheng Kung University
Tainan City, Taiwan
LEE, YUN WEN