Mother and child cards, also known as conjoined cards, usually consist of a large card and one or several small cards. There is a dotted line at the connection point between the two cards, which is full of pinholes and is easy to break. Into several independent cards. Belonging to a special-shaped card. Generally used as a membership card in supermarkets or shopping malls.

The two cards are sprayed with the same barcode for the supermarket to scan and record the member information. The big card is the standard size (bank card size), and the small card generally has a small round hole in the corner, which can be worn on the key chain and is more convenient to carry.

Extended data:

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MasterCard technology:

First, the smooth mother card. It can be divided into screen printing, offset printing and offset printing after screen printing. Screen printing, offset printing and offset printing after screen printing can add bronzing/silver, magnetic stripe, bar code and signature strip when making smooth master cards.

Second, the matte mother card: the matte mother card is similar to the smooth card, and the difference lies in the reason why the matte card wants and works. Generally, customers are not advised to do the process of bronzing and ironing silver.

Third, the transparent mother-child card: the transparent card is made of transparent pvc glue, which can also be divided into screen printing, offset printing and offset printing after screen printing. Screen printing, offset printing and offset printing after screen printing can be added with processes such as bronzing, magnetic stripe, bar code and signature strip.