| 摘要 |
Disclosed is a cold storage safety indicator using a temperature dependent layer. The cold storage safety indicator using a temperature dependent ink layer of this present invention includes: a surface layer on the front; a temperature dependent ink layer formed on the bottom part of the surface layer and changing color depending on the temperature by printing letters or design in relief or in intaglio; and a rubber magnetic board, a release paper or a base board which interstratifies a bonding layer on the bottom part of the temperature dependent ink layer. According to the present invention, by the cold storage safety indicator either attached onto or inserted into a cold storage box such as a refrigerator, a user can upon opening the refrigerator door identify with the naked eye whether or not the food, fruit, vegetable and beverage etc. have been stored with freshness intact, which prevents a spoilage of food, thereby helping to avert food poisoning and various germs. Furthermore, an identification of a certain temperature is enabled as a change in colors is visually displayed according to a change in temperature. This invention can especially be used for a refrigerator, a cooler, and a cold or frozen storage parcel. |
