What are the processing methods of paper bowls

In the modern food packaging industry, the manufacturing process of paper bowls involves several key links, among which the selection of raw materials is a crucial step. The main raw material of paper bowls is usually bleached wood pulp, which is made by professional pulp and paper mills through a series of fine processing. The choice of raw materials will vary depending on the market positioning and grade of the product. High-end products usually use imported high-quality wood pulp to ensure the excellent performance of paper bowls in strength and texture; mid-range products may use domestic ordinary wood pulp, while low-end products may use short-fiber pulp such as bagasse pulp, wheat straw pulp, bamboo pulp or reed pulp in order to control costs. The selection of these raw materials not only directly affects the physical properties of paper bowls, but also determines their environmental characteristics to a certain extent, reflecting the efforts of enterprises in sustainable development.

After determining the raw materials, the next key step is pulping. In the pulping process, foam pulp and hydraulic turbine beater play a vital role. Through physical action, these equipment can effectively separate fibers and improve their bonding ability, laying a solid foundation for subsequent molding processes. At the same time, in order to improve the moisture resistance and waterproof performance of paper bowls, specific auxiliary materials need to be added during the pulping process. The selection and proportion of these auxiliary materials must undergo rigorous experiments and tests to ensure that the quality of the final product meets the expected standards.

Forming is the core link in the paper bowl manufacturing process. The pulp that has been processed by pulping is transported to the forming machine and dehydrated and formed through a metal mold. In this process, about 95% of the water is removed to form the initial shape of the wet pulp tableware. The quality of forming is directly related to the shape, size and difficulty of subsequent processing of the paper bowl. Therefore, factors such as the selection of the forming machine, the design and quality of the mold, and the characteristics of the pulp are particularly important.

Molding and drying are two important steps following molding. The molding process further compacts the wet paper mold through a special press to remove residual water and enhance the bonding force between fibers. This link not only helps to reduce drying costs, but also significantly improves the strength of the paper bowl. The subsequent drying process uses preheated upper and lower shaping molds to heat the paper bowl, evaporate the remaining water, and achieve a sterilization effect. Since the drying process involves high heat energy consumption, the reasonable design of the drying process and the improvement of thermal efficiency have become the key to reducing costs and improving economic benefits for paper bowl manufacturers.

Shaping and trimming are the last few processes in the manufacture of paper bowls. During the shaping process, the hot mold press forming and calendering steps are used to eliminate the mesh marks left during the paper net forming process, making the inner and outer surfaces of the paper bowl smooth and flat. At the same time, according to customer needs, text or patterns can be embossed on the paper bowl to enhance its market competitiveness. The trimming process completes the final processing of the paper bowl by removing the burrs on the edge of the paper bowl and pressing out the indentation that facilitates the folding and opening of the box cover.