Extrusion Molding Process Flow for Plastic Pipes
Time：
2017-11-19
Plastic pipes are classified into flexible and rigid types, with broadly similar manufacturing processes; the differences lie mainly in the auxiliary equipment. Rigid pipes are cut to a fixed length, whereas flexible pipes are wound onto a reel to a specified length before being cut. The extrusion molding process for plastic pipes involves using a plastic extruder: PVC powder is directly extruded into pipe form using a pelletizing machine. The specific production sequence may vary slightly depending on the raw materials and equipment—for example, producing pipes from PVC powder differs from using PVC pellets—yet the fundamental principle remains unchanged: after the plastic is uniformly plasticized within the extruder barrel, it is forced through the annular die at the front of the barrel, forming a parison that exits the die and enters a sizing sleeve (using…).
Plastic pipes are classified into flexible and rigid types, with broadly similar manufacturing processes; the only difference lies in the auxiliary equipment: rigid pipes are cut to fixed lengths, whereas flexible pipes are wound onto a reel to a specified length before being cut.
Extrusion Molding Process for Plastic Pipes
Plastic extruder
Production process flow for directly extruding plastic pipes using a plastic pelletizing machine for PVC powder.
The process flow also varies slightly depending on the raw materials and equipment; for example, producing pipes from PVC powder differs from using PVC pellets. However, the underlying principle remains unchanged: after the plastic is uniformly plastified within the extruder barrel, it is forced through the annular die at the front of the barrel. The parison exits the die and enters a sizing sleeve—where cooling and shaping are achieved either by pressurization or vacuum—to solidify its surface layer. It then passes into a cooling water tank for further cooling. Once sufficiently cooled, the pipe is drawn out by a traction device and cut to length by a cutting mechanism. In principle, any thermoplastic can be used for extrusion‑based pipe production, but the most commonly employed resins are RPVC, SPVC, PE, and PP.
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