1. Raw Material Preparation and Formula Mixing

Before producing color-coated steel plate protective film, the raw materials must be prepared and precisely proportioned. The core raw materials include substrate particles, adhesive, and auxiliary additives. Based on the performance requirements of the protective film, the substrate particles and additives are mixed in a specific ratio to ensure that the resulting substrate possesses properties such as wear resistance and aging resistance. The adhesive is also mixed, adjusting the ratio of ingredients to control its viscosity and stability, laying the foundation for the subsequent coating process. Throughout the entire process, raw material purity must be strictly controlled to prevent impurities from affecting product quality.

2. Substrate Extrusion and Cooling

After raw material preparation, the substrate forming process begins. The mixed substrate material is fed into an extruder, heated at high temperature to melt it into a molten state, and then extruded through a die into a continuous film. The extruded substrate immediately enters a cooling unit, where it is quickly solidified and solidified by immersion in cold water or cooling with cold air, ensuring a uniform thickness and smooth surface. During the cooling process, the temperature and speed must be controlled to prevent uneven shrinkage and deformation of the substrate, which could affect the subsequent adhesive coating.

3. Adhesive Coating and Drying and Curing

After the substrate is formed, the adhesive coating process is performed. The prepared adhesive is evenly applied to one side of the substrate. A doctor blade or roller is used to control the thickness of the adhesive layer, ensuring even distribution and free of bubbles. After coating, the substrate is transferred to a drying chamber where it is dried and cured at an appropriate temperature to ensure a strong bond between the adhesive layer and the substrate, enhancing adhesion and improving the stability of the adhesive layer. Drying temperatures must be strictly controlled. Excessively high temperatures can cause adhesive degradation, while excessively low temperatures can impair curing and cause the adhesive layer to easily fall off.

4. Finished Product Cutting and Quality Inspection

Finally, the finished product is cut and inspected. The cured protective film roll is cut into various sizes using a cutting machine according to customer needs or standard specifications. The cutting process ensures precise dimensions and clean edges to avoid burrs or deviations. After cutting, quality inspectors conduct a comprehensive inspection of the finished product, checking the film's thickness, adhesion, surface smoothness, and presence of damage, bubbles, and other issues. Qualified products are packaged and stored, while unqualified products are returned to the appropriate process for reprocessing to ensure that all products meet quality standards before leaving the factory.