1. Selection of printing materials: First, determine the packaging material, plastic? Paper? Paper-plastic composite? All these should contact the corresponding printers, select materials, quantify and price.

2. Graphic design: In this link, computer design software, such as photoshop, pagemaker, illustrator, is used to design the visual effect map of the packaging.

3. typesetting: according to the materials used in packaging, the designed patterns are output to the corresponding workstations, and computer typesetting is needed according to the printing volume.

4. plate making: according to different materials, plate making methods are different. Plastic packaging needs electronic engraving intaglio or relief; If it is paper packaging, it needs offset printing. In the meantime, according to different processes, film will be needed.

5. Printing and bagging: the plates engraved with patterns are handed over to the printer for batch printing, and then cut and bagged according to the filling method of the contents.

The above is the traditional manufacturing process of packaging bags. Nowadays, plateless printing technology is adopted in many places, and the printing machine directly skips the plate-making machine to make the packaging bag independently.

But no matter which process, PS can't make food packaging bags, but can only make packaging renderings.