What is blister card packaging? What problems should be paid attention to in the blister card packaging?

Blister card packaging refers to the heat sealing of the blister on the surface of the paper card with blister oil, which is commonly used in supermarket battery packaging. It is characterized by the need for blister sealing equipment to encapsulate the product between the paper card and the blister.
The issues that should be noted are:
1. The surface of the paper card must be over blister oil (so that it can be heat-sealed with the PVC foam shell);
2. The bubble shell can only use PVC or PETG sheet;
3. Because the blister is only stuck to the surface of the paper card, the packaged product is not easy to be too heavy.