The production process of PVC panels is a meticulous and multi-step process, mainly including six stages: batching, mixing, extrusion (or calendering), molding, cooling, and cutting.
In the batching stage, the raw materials such as polyvinyl chloride resin, stabilizers, lubricants, and fillers must be precisely weighed according to the formula. The proportions of these raw materials directly affect the final performance of the PVC panel. The mixing stage involves thoroughly mixing these raw materials to ensure consistent dispersion of each component, laying the foundation for stable panel performance.
Extrusion is one of the key steps in PVC panel production. The mixture is heated and plasticized in a screw extruder and extruded through a die of a specific shape into a continuous sheet. In this process, the control of temperature, pressure, and extrusion speed is crucial, as they collectively determine the quality and dimensional accuracy of the sheet. Calendering is an alternative to extrusion, where the plasticized material is calendered into a sheet through multiple rollers. It also requires precise control of the roller temperature, pressure, and speed.
During the molding process, the slab is further processed using a shaping mold to control its thickness, width, and shape, ensuring it meets design requirements. This step is crucial for guaranteeing the dimensional accuracy and appearance quality of the PVC sheet.
The cooling process utilizes cooling water or cold air to rapidly cool and solidify the sheet, preventing deformation during subsequent processing or use. The cooling rate and method must be adjusted appropriately based on the material and thickness of the sheet.
Finally, the sheet is cut to suitable sizes and lengths according to customer needs, completing the PVC sheet production. During cutting, it is essential to ensure the flatness and dimensional accuracy of the cut surfaces to meet the requirements of different application scenarios.
