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Extrusion Line of CPVC Pipe UL

2025-06-23

An Extrusion Line for CPVC Pipe (UL standard) is a high-performance production system designed to manufacture Chlorinated Polyvinyl Chloride (CPVC) pressure pipes, typically used for hot and cold water plumbing, fire sprinkler systems, and industrial applications. The UL (Underwriters Laboratories) certification ensures compliance with North American safety and performance standards, especially UL 1821 and ASTM F441/F442.

Key Components of a CPVC Pipe UL Extrusion Line:

Component	Description
Conical Twin-Screw Extruder	Specially configured for CPVC’s high viscosity and processing temperature
Gravimetric Feeder	Precise material dosing for compound consistency
Vacuum Calibration Table	Stainless steel tanks with powerful vacuum and water sprays for pipe shaping
Haul-off Machine	Multi-caterpillar or belt-type to grip and pull CPVC pipe uniformly
Cutter (Planetary or Chipless)	High-precision cutting without pipe deformation
Belling Machine (Socketing)	Makes socket ends for solvent welding; UL often requires socketed ends
Co-Extruder (Optional)	For stripes (identification or flow direction)
PLC + HMI Control	Full automation with recipe storage, alarms, and data tracking

Why CPVC Requires Specialized Equipment:

CPVC must be processed at higher temperatures (170–210°C) than PVC.

Sensitive to shear and thermal degradation → demands temperature-precise extrusion.

UL-certified pipes often require tight ovality, wall thickness, and color control.

Typical Pipe Specs for CPVC UL Line:

Spec	Range
Pipe Diameter	1/2" – 8" (15mm – 200mm)
Pressure Rating	SCH 40 / SCH 80
Wall Thickness Tolerance	±0.1 mm (depends on size/class)
Line Speed	Up to 6–10 m/min (varies by diameter)
Certification Compliance	UL 1821, ASTM D1784, ASTM F441/F442