a monitoring card

Abstract

The invention relates to a monitoring card. The monitoring card comprises a color changing card body and a comparison card body, wherein the color changing card body comprises an isolation layer, a radiation layer and a color development layer, the isolation layer, the radiation layer and the color development layer are sequentially stacked from bottom to top, the radiation layer is film made of matter containing radioactive elements, the color development layer is a piece of paper which can carry out reversible or irreversible color changing after being radiated, the comparison card body is divided into a color area and a time area, a plurality of time intervals are marked on the time area, color blocks corresponding to the time intervals in a one-to-one mode are marked on the color area, colors of the color blocks on the color area are the colors displayed by the color development layer which is subjected to radiation of the corresponding time intervals, and the isolation layer is a plate layer used for isolating radiation of the radiation layer. The monitoring card can monitor the time, display the production date of a product, and ensure authenticity and effectiveness of display, and falsification cannot be made. Meanwhile, safety of the monitoring card is ensured due to the arranged isolation layer, and the monitoring card further has the advantages of being high in accuracy, simple in structure, convenient to use, wide in application range and the like.

Description

technical field [0001] The invention relates to a monitoring card, in particular to a monitoring card for monitoring product production dates. Background technique [0002] The existing means for marking the production date and shelf life of the product is to stick a sticker on the product. The label usually uses ordinary ink to print the production date and shelf life of the product on paper, but the production date and shelf life printed in this way are easy. Modification or removal by means of smearing, scratching, etc. cannot guarantee the authenticity of the production date on the label. Some unscrupulous merchants use the shortcoming of easy modification of existing labels to modify the production date of products to deceive consumers. Contents of the invention [0003] Aiming at the problems that labels are easy to modify and break, the invention proposes a monitoring card, which truly and reliably reflects the production date of the product. [0004] The technica...

AI Technical Summary

Problems solved by technology

[0002] The existing means for marking the production date and shelf life of the product is to stick a sticker on the product. The label usually uses ordinary ink to print the production date and shelf life of the product on paper, but the production date and shelf life printed in this way are easy. Modification or removal by means of smearing, scratching, etc. does not guarantee the authenticity of the production date on the label

Some unscrupulous merchants use the shortcomings of the existing labels to modify the production date of the product to deceive consumers.

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