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How can stretching deformation and brittle fracture be prevented during pipe manufacturing?
Stretching deformation: occurs when the traction speed exceeds the extrusion speed and the pipe is pulled out before it has cooled sufficiently. Solution: reduce the traction speed to ensure adequate cooling of the pipe in the cooling tank (surface temperature ≤ 40°C), and adjust the synchronization between traction and extrusion.
Mar 17,2026
There is no need to replace the extrusion main unit; simply swap out the die of the corresponding diameter (die + sizing sleeve) and adjust process parameters such as haul-off speed, vacuum level, and cooling temperature. If the diameter range is too wide—for example, switching from φ63 mm to φ315 mm—then the corresponding haul-off machine fixture or conveyor belt must also be replaced.
Mar 17,2026
What are the core components of a PVC sheet production line?
The core equipment comprises an extrusion unit (single- or twin-screw), a die (specifically designed for sheet production), a three-roll calender, a haul-off unit, a cutting machine, and a stacker; it is also equipped with a cooling system, a temperature-control system, a feeding system, and a dust-collection system. High-end production lines further include auxiliary machines such as in-line thickness gauging, laminating, and polishing units.
Mar 17,2026
What are the solutions for uneven foaming and internal voids in rigid PVC sheets?
Uneven foaming: Adjust the dosage and dispersion of the blowing agent, optimize the temperature-control profile (to prevent localized overheating or underheating), and ensure uniform plasticization by the screw.
Mar 17,2026
① Select qualified heat stabilizers and add them precisely according to the formula to avoid insufficient stabilizers; ② Strictly control the temperatures at each stage to prevent local overheating (the decomposition temperature of PVC is approximately 180℃); ③ Ensure that the gap between the screw and the barrel is reasonable to avoid material stagnation; ④ Dry the raw materials in advance to remove moisture and prevent hydrolysis and decomposition; ⑤ Regularly clean the molds and screws to avoid carbonization of accumulated materials.
Mar 17,2026
Common Quality Issues and Solutions
Rough outer surface of the pipe Causes: improper temperature, insufficient cooling, material buildup in the die Remedies: reduce die head temperature, set cooling water temperature to 20–25°C, and clean the die
Mar 17,2026
What is the applicable pipe diameter range for the production line?
Small diameter: 16–63 mm (single mold, dual outlet) Standard: 20–630 mm (water supply / gas) Large-diameter corrugated pipe: 200–600 mm Spiral-wound pipe: 300–1200 mm+
Mar 17,2026
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