First of all, the paper used to make paper containers must be food grade paper. Food paper is mostly imported from Europe and the United States and is considered the best grade among paper materials. Next, the paper must be coated with oil- and water-resistant materials through a laminating process before the subsequent molding steps can be carried out.

Lamination is a very thin layer of plastic material attached to the paper, making the paper cup resistant to oil and water, and able to hold drinks, soups and food for a long time. The selection of this layer of coating material is also related to the characteristics of subsequent paper cups. This is the step to make the paper cup strong and beautiful.
After the lamination process, the required patterns and colors will be printed on the paper roll. Printing methods can be divided into three methods: gravure, convex plate, and flat plate. The cost of gravure printing is too high and it is rarely used now; relief printing uses paper rolls for continuous printing and requires a large printing volume. Lithographic printing cuts paper into slices and then prints it, which is suitable for manufacturing small-volume products. After the ink is applied, another layer of water gloss treatment will be printed for protection.