Cold-seal packaging is a complex package. It often involves two films, one reverse-printed with the brand owner’s graphics and a second that provides the barrier to protect the product inside.
These two films are then laminated together to produce a single inseparable web. From there, the cold seal is applied on the inside surface of the web in a pattern registered/aligned with the graphics on the outside of the web.
Easy enough, but selecting the right two films from the beginning is highly important. Both the film and the cold seal must be compatible. Otherwise, you run the risk of not being able to unwind finished rolls at the time of packaging. This is known as blocking. Another risk due to incompatibility between cold seal and film is poor package seals — or even no seals.