1. Raw Material Preparation

• PVC Resin: Select PVC resin that meets specifications, ensuring it has good stability, processability, and transparency to guarantee product quality.
• Additives:
  • Plasticizers (e.g., phthalate esters): To increase the plasticity and flexibility of PVC resin.
  • Blowing agents (e.g., azodicarbonamide, AC): To generate bubbles and form a foaming structure.
  • Stabilizers, lubricants, pigments, etc.: Serving functions like stabilizing product performance, improving processability, and imparting color.
• Other Materials: Fillers (e.g., CaCO₃, talc) and reinforcing materials may be prepared as needed to adjust the properties of PVC foam boards.

2. Batching and Mixing

• Weighing: Accurately weigh the raw materials according to the formula ratio to ensure the precision of each component.
• Stirring and Mixing: Put the weighed materials into a mixer. First, perform low-speed pre-mixing, then use a high-speed mixer for intensive stirring to fully and uniformly blend all raw materials into a homogeneous mixture.

3. Extrusion Molding

• Plasticization: Feed the mixed materials into an extruder. Under high temperature and pressure, the materials gradually melt and form a uniform melt, during which the materials are fully plasticized to obtain good fluidity.
• Extrusion and Foaming: Extrude the melt through a mold to form the shape of a board. Meanwhile, add blowing agents. Under specific temperature and pressure conditions, the blowing agents decompose to generate gas, triggering the formation of a foaming structure and making the board porous.

4. Cooling and Shaping

• Cooling Treatment: Cool the extruded board using methods like air cooling or water cooling to rapidly reduce its temperature, allowing the melt to crystallize and set, maintaining the board’s shape and structure, and preventing thermal deformation.
• Shaping Device: Design a reasonable shaping device to ensure the foamed board remains stable during cooling, preventing shrinkage and warping. Meanwhile, adjust the cooling rate to control the crystallinity and density of the board, affecting its properties and appearance.

5. Surface Treatment and Cutting

• Surface Treatment: Polish, paint, or laminate the surface of the cooled and shaped board to improve its aesthetics and enhance its moisture-proof, anti-corrosion, and other functional properties.
• Cutting: Cut the board into products of different specifications and shapes as needed for easy transportation and use. After passing inspection, the qualified products are packaged and stored.