Today, with the parallel development of fast food culture and environmental protection concepts, paper takeaway boxes are gradually becoming the mainstream choice in the catering packaging market with their unique environmental protection properties. However, how to improve the waterproof performance of the boxes while ensuring environmental protection to meet the diverse needs of food packaging has become the focus of the industry. In this process, corona treatment, as a key step before coating, is bringing revolutionary improvements to the waterproof performance of paper takeaway boxes with its unique physical modification ability.

Corona treatment, a seemingly mysterious physical modification method, is actually a discharge phenomenon caused by applying a high-frequency high-voltage electric field on the surface of paper. In this process, the molecular structure of the paper surface undergoes subtle changes under the action of the electric field, as if it has been activated, forming a uniform and subtle electric field. This electric field is not just a simple charge distribution, it is more like an invisible craftsman, carefully carving the surface of the paper, making it rougher and more suitable for the attachment of coating materials.

The improvement of the waterproof performance of paper takeaway boxes by corona treatment is mainly reflected in two aspects. First, by increasing the roughness of the paper surface, corona treatment provides a more stable attachment foundation for the coating material. This means that the coating material can fit more closely to the paper surface, forming an indestructible waterproof barrier. Secondly, corona treatment also promotes the uniform distribution of the coating material on the paper surface. Under the guidance of the electric field, the coating material seems to be given life, and can flow and spread on the paper surface autonomously, ensuring that every detail can be fully covered, thereby ensuring the consistency of the waterproof effect.

For paper takeaway boxes, the improvement of waterproof performance is not only related to user experience, but also to the fulfillment of environmental protection responsibilities. Although traditional plastic lunch boxes have excellent waterproof performance, their difficult-to-degrade characteristics have brought a heavy burden to the environment. Although paper lunch boxes are environmentally friendly, untreated paper is often difficult to resist the erosion of soup and grease. The combination of corona treatment and coating technology is born to solve this problem. It allows paper takeaway lunch boxes to have waterproof performance comparable to plastic lunch boxes while maintaining environmental protection characteristics, providing strong support for the green development of the catering industry.

With the advancement of technology and the improvement of environmental awareness, we have reason to believe that paper takeaway boxes will be smarter and more environmentally friendly in the future. As one of the key technologies to improve waterproof performance, corona treatment will continue to be optimized and improved. At the same time, with the continuous emergence of new coating materials and the continuous innovation of coating processes, the waterproof performance, hardness and aesthetics of paper takeaway boxes will be further improved. This will bring consumers a safer, more convenient and environmentally friendly dining experience, and also contribute to the sustainable development of the catering industry.