How to print on packaging bags

Release date:

2022-01-13 13:39

Nowadays, many packaging bags focus heavily on eye-catching advertising ideas, incorporating compelling copywriting that highlights the product’s unique features directly onto the bag’s exterior—designed to spark customers’ desire to buy. We often come across creatively crafted packaging bags, but how exactly do manufacturers manage to print such eye-catching designs?
Before printing, color separation and plate-making are carried out first. This process requires a white plate for underprinting, as well as the corresponding color plates. The entire operation can be performed either in an electronic engraving system or properly planned within the prepress workflow, after which the printing plates can be directly engraved on an electronic engraving machine.

If printing is done on a web press, the detailed steps are: mounting the plate, applying the doctor blade, preparing and adjusting the ink, loading the roll, conducting test prints, fine-tuning the process, and finally starting the official printing. As for laminating the printed plastic bags, this is carried out on a dedicated laminating machine. The final step in producing the plastic bags is bag-making—specifically, the practical process of bonding two layers of film together to form a three-sided sealed bag, which is then cut into individual bags.