What is the forming process of paper cups in paper cup machines?

Introduction to the forming process of paper cups in paper cup machines

Forming takes only a moment! Let me introduce the forming process of paper cups.

First of all, the paper used to make paper containers must be food-grade paper. Most food-grade paper is imported from Europe and the United States, which is the best grade among paper materials. Then it must first be coated with a coating process to coat the paper surface with oil- and water-resistant materials before the subsequent forming steps can be carried out.

Coating is to attach a very thin layer of plastic material to the paper, so that the paper cup can be oil- and water-resistant, and can hold beverages and soups for a long time. The selection of this coating material is also related to the characteristics of the subsequent paper cups. This is the step to make the paper cups strong and beautiful.

After the coating process, the required pattern and color will be printed on the paper roll. The printing method can be divided into three methods: gravure, relief plate, and flat plate. The gravure cost is too high and is now rarely used; relief plate printing uses paper rolls for continuous printing, and the required printing volume is large. Lithographic printing cuts the paper into pieces before printing, which is suitable for manufacturing small quantities of products. After the ink is applied, a layer of water gloss treatment will be printed as protection.

Some businesses use the "ink-in-printing" method, which is to print first and then coat the film, and the ink is coated in the coating. This production method has a higher loss rate, so the cost is also higher. However, no matter which printing method is used, the printing materials of containers that come into contact with food must be food grade to ensure safety when consumed.

The printed paper enters the die to punch out fan-shaped paper pieces, which is the unfolded shape of the paper cup wall. These fan-shaped papers are collected and sent to the forming machine, and the paper is then rolled into the shape of a paper cup outside the cup mold. At the same time, the mold provides heat at the seam of the paper, allowing the PE to be damaged by heat and bonded to each other, and the bottom of the paper cup is then installed and bonded. Then the mold pushes the cup mouth, allowing the paper at the cup mouth to roll down and fix it with heat, forming the rim of the paper cup. These molding steps can be completed in one second.

The finished paper cups are then sent to the inspection machine to confirm whether the shape is intact and not damaged, and the internal surface is clean and free of stains. After the inspection, the finished paper cups enter the packaging process and wait for shipment.

The above is an introduction to the forming process of the paper cup machine. Contact us at sales@yongbomachinery.com to learn more about the paper cup machine.