(PA) Nylon Pipe Extrusion Line

During the production of nylon pipes, temperature control for equipment differs from other plastic products. For instance, the feeding section of the extruder needs to be close to the resin’s melting point. In contrast, the plastification section requires a temperature around 20°C higher than the resin’s melting point. Then, in the homogenization section, the temperature decreases and is controlled just above the material’s melting point. Finally, the temperature needs to be slightly lower at the die head than in the homogenization section. (Taking the example of extrusion using PA1010 resin, the temperature control ranges for equipment sections, including feeding, plastification, homogenization, die-head connection, and mold, are: 250-260°C, 260-270°C, 260-280°C, 220-240°C, and 200-210°C, respectively.)

In pipe production, except for a few rigid pipes that may not require traction equipment, nylon pipe production necessitates traction equipment. The draw ratio of the traction equipment needs to be controlled between 1.2 and 1.5. Additionally, the water used for pipe cooling should be circulated and maintained between 15-22°C to ensure the quality of the final product.

Apart from the above considerations, it’s essential to note that polyamide resin melt is prone to decomposition, emphasizing the importance of temperature control without significant fluctuations. Whether using a horizontal or vertical entry into the cooling water tank during pipe forming, attention must be paid to the proximity of the die to the cooling water tank to ensure rapid cooling and setting of the pipe. When producing PA1010 nylon pipes, using materials with higher viscosity resin is advisable to prevent significant deformation when extruding material from the die opening.