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Profile production line

Time：

2018-12-19

The profile extrusion line comprises a main machine, screw and die, along with the necessary auxiliary equipment, enabling the production of a wide variety of profiles—such as PVC, PP, and PE. Its key features include: first, mold design can be tailored to meet customer requirements, allowing for the manufacture of plastic rigid pipes in multiple specifications and shapes, as well as diverse end products; second, the screw design is well‑established, delivering high extrusion output, excellent plasticizing performance, clean edges, and a very high yield of conforming parts; third, it employs a vacuum‑assisted water‑circulation cooling system that conserves energy; and fourth, die changes are convenient and rapid. The profile extrusion line encompasses both plastic profile extrusion lines and plastic pipe production lines, as well as plastic sheet‑extrusion lines.

The profile extrusion line comprises a main machine, screw and die, along with the necessary auxiliary equipment, enabling the production of a wide variety of profiles—such as PVC, PP, and PE. Its key features include: first, mold design can be tailored to customer specifications, allowing for the manufacture of rigid plastic pipes in multiple sizes and shapes, as well as diverse end products; second, the screw design is well‑established, delivering high extrusion output, excellent plasticizing performance, clean edges, and a very high yield of conforming parts; third, it employs a vacuum‑assisted water‑circulation cooling system that conserves energy; and fourth, die changes are quick and convenient, with fast cycle times.

Extrusion lines for profile products include plastic extrusion lines for profiles, as well as lines for plastic pipes and plastic sheets. The primary applications of plastic extrusion equipment for profiles are the production of plastic door and window profiles, decorative plastic sheets, PVC foam profiles, and other plastic products.

Extrusion lines for profile production can be classified into two types—pre‑coextrusion and post‑coextrusion—based on the conditions under which the coextruded materials are formed and their processing states. Pre‑coextrusion involves combining two materials during the extrusion process, before the final product has been fully shaped. Post‑coextrusion, by contrast, entails forming one material completely first, followed by the addition of a second material to achieve composite molding. A key advantage of post‑coextrusion is its effective utilization of recycled or waste materials, resulting in improved cost efficiency.

Extrusion lines for profile production can be classified into two types—organic co-extrusion and inorganic co-extrusion—depending on the materials of the extruded products. Organic co-extrusion encompasses both co-extrusion with identical constituent materials and co-extrusion using different materials, as well as post‑extrusion involving soft and rigid polyvinyl chloride. Inorganic co-extrusion is further divided into aluminum–plastic composite co-extrusion and steel–plastic composite co-extrusion.

Compared with conventional co-extrusion, co-extruded plastic profile extrusion lines feature a simpler process, greater flexibility, lower scrap rates, easy recyclability, controllable bonding strength, and other notable advantages. Today, this technology is primarily used to produce profiles for doors and windows equipped with sealing strips.

Traditional co-extrusion profiles are produced on lines that use two or more extruders to feed molten materials with differing rheological properties or colors into a common forming die. These melts follow separate flow paths within the die, converge at the die lip, and are then co-extruded; the profile is subsequently vacuum‑drawn and cooled in a sizing sleeve to achieve its final shape.