The production process of PVC foam board production line mainly includes key steps such as material preparation, foaming process control, extrusion molding, cooling and shaping, and post-treatment. ‌

Preparation of materials ‌

Determine the raw materials (such as polyvinyl chloride resin) and auxiliary materials (including stabilizers, foaming agents, foaming regulators, lubricants and fillers, etc.) based on the production orders. ‌

For special performance boards (such as UV-resistant, flame-retardant or colored products), additional reinforcing agents or color masterbatches need to be added. ‌

All materials should be mixed evenly in proportion, and the formula needs to be adjusted and optimized according to the characteristics of the equipment. ‌

Youdaoplaceholder0 foaming process control ‌

The raw materials are heated at high temperatures and undergo three processes: molding, bubble expansion and curing. ‌

Technicians need to strictly control the foaming speed to ensure uniform foam expansion and prevent cell collapse or the formation of large bubbles. This stage plays a decisive role in the density and quality of the board. ‌

During the initial production stage, foaming adjustment is required. Before stabilization, waste boards may be generated, so there is a requirement for the minimum order quantity. ‌

Extrusion molding ‌

The mixed raw materials are melted and plasticized through a twin-screw extruder (such as a conical twin-screw extruder) and extruded from the die. ‌

During the extrusion process, the foaming agent is completely decomposed in the shaping die, and the stabilizer controls the stability of decomposition to ensure continuous production. ‌

Mold design (such as molds for foamed products) affects the density and surface finish of the products. Common processes like the Selucka method are used to achieve skin foaming. ‌

Cooling and setting ‌

The extruded sheet is rapidly cooled to a fixed shape through a water-cooling shaping table or an eight-roll traction unit. ‌

The cooling process needs to be uniform to avoid deformation. Usually, cooling pipes are designed to optimize heat conduction. ‌

Post-processing ‌

After cooling through the shaping die, the edges of the sheet are trimmed by the edge trimming device and then covered with protective film as required. ‌

Finally, the plates are cut into standard or custom lengths by cutting equipment, and the mechanical hand automatically inserts and stacks them to complete the process. ‌

The entire process requires coordinated control of parameters such as temperature, pressure, and extrusion speed to ensure the dimensional stability, surface quality, and mechanical properties of the PVC foam board. ‌