PVC Pipe Extrusion Line

PVC Pipe Extrusion Lines

Industrial PVC pipe extrusion lines process unplasticized PVC (UPVC), flexible PVC, and modified PVC compounds into rigid pressure pipes, non-pressure drainage conduits, electrical ducts, and corrugated piping systems.

Equipment configurations scale from single-pipe outputs to high-capacity dual-strand systems, operating across a standard diameter envelope of 16–800 mm.

Overview

A standard PVC pipe extrusion line integrates raw material dosing, plasticization, melt shaping, vacuum sizing, cooling, traction pulling, inline cutting, and belling or stacking operations.

Processing dry-blend UPVC powder requires specific counter-rotating twin-screw geometry to deliver high shear at lower melt temperatures (175–190°C). This prevents thermal degradation, limits stabilizer consumption, and maintains melt homogeneity across varying bulk densities.

Key Features

Conical & Parallel Twin-Screw Extruders

Conical screws (51/105 mm to 92/188 mm) suit smaller pipe diameters and high-filler dry blends; parallel screws (75 mm to 130 mm) handle high-output, large-diameter pressure pipe runs.

Vacuum Calibration Systems

Stainless steel calibration tanks equipped with automatic water temperature and vacuum level regulators prevent pipe deformation during primary wall setting.

Multi-Caterpillar Haul-Offs

Multi-track pullers driven by individual AC servo motors maintain synchronization with extruder output to prevent wall thickness variations under 1.5%.

Inline Belling Units

Automatic belling machinery forms R-type (rubber ring joint) or S-type (solvent cement socket) pipe ends directly downstream.

Product Types

PVC Pipe Production Categories
UPVC Pressure Pipes (Potable Water / Industrial Process)
UPVC Non-Pressure Pipes (Drainage / Sewerage / Soil & Waste)
CPVC High-Temperature Pipes (Hot Water Distribution)
PVC Conduit & Tubing (Electrical Cable Ducting)
Multi-Layer / Foam-Core PVC Pipes (Sound-Insulated Drainage)

UPVC Pressure Pipe Lines
• Diameter Range: 16–630 mm
• Standard Ratings: PN6, PN10, PN16, PN25
• Primary Application: Municipal potable water networks and agricultural irrigation systems.

UPVC Drainage & Sewer Pipe Lines
• Diameter Range: 50–800 mm
• Wall Construction: Solid wall or structured foam-core (3-layer co-extrusion).
• Primary Application: Gravity drainage, building soil waste, and underground municipal sewers.

Electrical Conduit Extrusion Lines
• Configuration: Dual-strand or quad-strand extrusion for high-speed small-diameter output (16–50 mm).
• Primary Application: Rigid and pliable cable protection conduits.

Applications

Municipal Infrastructure

Potable water mains, storm water drainage trunks, and underground sewage lines complying with ISO 4422 and EN 1452 standards.

Building Services

Soil, waste, and vent (SWV) systems, electrical wiring conduits, and cold water plumbing.

Agriculture & Irrigation

Subsurface drip supply lines, borehole casing pipes, and surface flood irrigation networks.

Industrial Fluid Handling

Chemical processing lines utilizing modified PVC-U or CPVC compounds for acid and alkali resistance.

Selection Guide

Match line selection to production requirements through a step-by-step engineering calculation:

01.

Calculate Throughput Requirements (kg/h)

Determine target hourly tonnage based on line speed (m/min), outer diameter (mm), and wall thickness (mm).

02.

Select Screw Type

Choose conical twin-screw extruders for standard dry blend formulas containing 10–30 phr calcium carbonate (CaCO₃). Select parallel twin-screw extruders for outputs exceeding 600 kg/h or low-filler formulations.

03.

Determine Cooling Length

Calculate vacuum tank and spray bath lengths based on heat capacity and maximum wall thickness to prevent residual thermal stress.

04.

Choose Cutting Method

Use planetary saws with dust extraction for rigid, thick-walled pipes; select chipless rotary cutters for thin-walled conduit to eliminate burrs.

Equipment & Line Components

An operational PVC pipe extrusion line comprises six main processing stages:
Dry-Blend PVC Compound

Twin-Screw Extruder
Pipe Die Head
Vacuum Calibration Tank
Caterpillar Haul-Off
Planetary Cutter
Automatic Belling Unit

Extruder Unit: Equipped with a forced side-feeder, vacuum degassing barrel zone, and oil-cooled screw core to control processing temperature.

Extrusion Die Head: Spider die or lattice die design made from 40Cr alloy steel, nitrided and polished internal flow channels to minimize melt friction.

Spray Cooling Tanks: Stainless steel (SUS304) construction with anti-clogging spray nozzles and brass pipe calibration sleeves.

Haul-Off Machine: Pneumatic clamping pads matching pipe diameter profiles, controlled via closed-loop encoder feedback.

Planetary Cutting Machine: Carbide saw blades with hydraulic feed control, synchronized with line speed via PLC interface.

Automatic Socketing Machine: Infra-red heating oven with expanding mandrel for solvent cement or rubber ring joint formation.

Technical Parameters

Model Code	Pipe Diameter Range (mm)	Max Output (kg/h)	Main Extruder Screw Code	Total Installed Power (kW)	Line Length (m)
SJZ-51/105	16–50 (Dual Strand)	150–180	Conical 51/105	55	18
SJZ-65/132	20–110	250–320	Conical 65/132	85	22
SJZ-80/156	75–250	400–480	Conical 80/156	130	28
SJP-90/28	110–315	550–650	Parallel 90/28 L/D	160	32
SJP-110/30	315–630	800–1000	Parallel 110/30 L/D	260	40

Manufacturing Evidence & Quality Control

Machining accuracy and material selection dictate extrusion equipment operational longevity.

In-House Production Process

Raw Steel Inspection → CNC Machining of Gearbox & Frames → Screw Nitriding → Assembly → Electrical Wiring → Factory Acceptance Testing (FAT)
Core Components: Screws and barrels utilize 38CrMoAlA steel, undergoing 72-hour gas nitriding treatment to achieve nitride depth 0.6–0.7 mm and surface hardness ≥950 HV.
Drive & Control Integration: Siemens AC main motors, ABB inverter drives, Schneider electrical components, and Siemens S7-1200 PLC touch-screen systems.
Machining Precision: Die head flow channels undergo CNC multi-axis milling, hard chrome plating (0.03–0.05 mm thickness), and mirror polishing (Ra ≤0.05 μm).

Pre-Shipment Factory Acceptance Testing (FAT)

12-hour continuous mechanical dry-run testing.
Thermal zone stability verification (±1°C PID variance).
Customer formulation dry-blend trial run to confirm output capacity (kg/h), wall thickness uniformity, and surface finish.

RFQ Checklist

Submit the following specifications to receive an itemized technical proposal:

Target Pipe Dimensions

Outer diameter range (mm) and SDR / wall thickness schedule.

PVC Compound Specifications

Formulation type (UPVC / CPVC / Foam-Core) and filler loading (CaCO₃ phr).

Target Output Rate

Required production capacity (kg/h or m/min).

Downstream Configuration

Inline belling requirement (R-Type, S-Type, or Plain end).

Utility Site Data

Available voltage (V/Hz), cooling water inlet temperature (°C), and compressed air pressure (bar).

FAQ

Q: What is the advantage of conical twin-screw extruders over parallel twin-screw extruders for PVC pipe production?

A: Conical twin-screw extruders feature a larger feed section diameter relative to the metering section. This geometry provides higher compression and thermal transfer area per unit output, making them suitable for processing low-density UPVC powder blends with high filler content at lower drive power.

Q: How is wall thickness variation controlled along the pipe circumference?

A: Circumferential wall thickness is regulated by centring screws on the die head die-ring, precise melt temperature control across heating zones, and uniform 360° water distribution inside the vacuum sizing sleeve.

Q: What causes surface roughness or melt fracture on extruded PVC pipes?

A: Surface roughness results from unplasticized PVC powder particles, incorrect lubrication balance in the chemical formulation, low die head temperatures, or moisture contamination in the raw material compound.

Q: Can recycled PVC regrind be processed on these extrusion lines?

A: Yes. Recycled UPVC regrind can be blended into the feed compound up to 20–30% without modifying screw geometry. Higher regrind ratios require specialized screw profiles and bimetallic barrel protection against wear.

Request a Custom Engineering Proposal

Send your pipe dimensions, compound details, and throughput targets to receive line layout drawings and equipment quotations within 24 hours.

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