Introduction to the forming process of the paper cup of the paper cup machine!
Forming in an instant! Let me introduce the forming process of paper cups.
First of all, the paper used for making paper containers must be food-grade paper. Food-grade paper is mostly imported from Europe and the United States, and it is considered to be the best grade among paper materials. Then, the process of laminating must be carried out first, and the material that can resist oil and water is coated on the paper surface before the subsequent forming steps can be carried out.
The coating is a very thin layer of plastic material attached to the paper, so that the paper cup can be resistant to oil and water, and can hold beverages and soups for a long time. The selection of the coating material is also related to the characteristics of the subsequent paper cups. This is the step to make the paper cup sturdy and beautiful.
After the lamination treatment, the desired pattern and color will be printed on the paper roll. Printing methods can be divided into 3 methods: gravure, convex plate, and flat plate. The cost of gravure is too high, and it is now rarely used; letterpress printing is continuously printed on paper rolls, and the required printing volume is large. Lithographic printing, in which paper is cut into pieces and then printed, is suitable for making small quantities of products. After the ink is applied, another layer of water gloss treatment will be printed as protection.
Some manufacturers use the method of “printing in ink”, printing first and then laminating, and wrapping the ink in the laminating film. This production method has a higher wear rate and therefore higher cost. But no matter what kind of printing method is used, the printing materials of containers that come into contact with food must be food-grade to ensure the safety of consumption.
The printed paper enters the knife mold and produces a fan-shaped piece of paper, which is the unfolded shape of the cup wall. The fan-shaped paper is collected and sent to the forming machine, and the paper is then rolled out of the cup mold into the shape of a paper cup. At the same time, the mold provides heat at the seam of the paper, so that the PE is thermally destroyed and adhered to each other, and the bottom of the paper cup is then glued. Immediately after the mold pushes the mouth of the cup, the paper at the mouth of the cup is rolled down and fixed by heat to form the rim of the paper cup. These forming steps can be completed in one second.
The completed paper cup is then sent to the inspection machine to confirm whether the shape is complete without damage, and the inner surface is clean and free of stains. The completed paper cup enters the packaging process and waits for shipment.
Post time: Sep-08-2022