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Product Description
The UPVC/CPVC pipe production line by Chenxing Machinery is a comprehensive extrusion system engineered for manufacturing unplasticized polyvinyl chloride (UPVC) and chlorinated polyvinyl chloride (CPVC) pipes spanning 16 mm to 800 mm in diameter. These pipes serve critical infrastructure applications — agricultural irrigation, building water supply and drainage, and underground cable protection conduits — where chemical resistance and dimensional stability are non-negotiable. The line integrates a conical or parallel twin-screw extruder with vacuum calibration, multi-claw haul-off, and fully automatic PLC-controlled cutting and stacking, producing pipes at power ratings from 47 to 295 kW depending on output configuration.
Built as a turnkey pipe extrusion solution, the line supports single, dual, and four-cavity die heads for high-volume small-diameter production, as well as specialized configurations for inner-wall spiral pipes, hollow-wall pipes, and three-layer foam-core pipes. For operations integrating plastic recycling, regrind-capable screw designs are available. All drive systems use imported AC frequency conversion speed regulation across extruder and haul-off stages for precise synchronization.
| Extruder Model | Pipe Diameter (mm) | Die Configuration | Total Power (kW) |
|---|
| SJZ 45/90 | 16–63 | Single cavity | 47 |
| SJZ 51/105 | 16–40 | Dual cavity | 60 |
| SJZ 51/105 | 16–63 | Dual cavity | 70 |
| SJZ 51/105 | 16–32 | Four cavity | 91 |
| SJZ 55/135 | 20–110 | Single cavity | 85 |
| SJZ 80/158 | 63–200 | Single cavity | 85 |
| SJZ 72/188 | 75–250 | Dual cavity | 96.5 |
| SJZ 65/132 | 110–315 | Single cavity | 136 |
| SJZ 80/156 | 200–450 | Single cavity | 114 |
| SJZ 92/188 | 315–600 | Single cavity | 145 |
| SJZ 92/188 | 315–630 | Single cavity | 212 |
| SJZ 105/216 | 500–800 | Single cavity | 220 |
Note: Additional configurations for 315–630 mm (212 kW) and 500–800 mm (220 kW, 270 kW, 295 kW) are available with oversized parallel twin-screw extruders. All power ratings are total installed power including downstream equipment.
The line leverages both conical and parallel twin-screw architectures selectable by pipe diameter. The SJZ conical series (45/90 through 92/188) provides superior self-cleaning action and narrow residence time distribution critical for heat-sensitive PVC processing. Screws are manufactured from 38CrMoAlA nitrided steel with surface hardness HV ≥ 900 and bimetallic barrels lined with Xaloy 102 or equivalent, delivering 15,000–25,000 operating hours between screw rebuilds depending on filler content. The counter-rotating intermeshing design generates low shear heat, maintaining melt temperature within a tight 175°C–195°C window — essential for avoiding thermal degradation that produces hydrochloric acid (HCl) and black specks. For diameters above 315 mm, parallel twin-screw configurations (SJZ 105/216) deliver the high torque and throughput required for heavy-wall municipal pipes.
For small-diameter pipes (16–63 mm), the line supports dual-cavity and four-cavity die heads that multiply output without requiring a larger extruder. Each cavity receives melt through a precision flow distributor maintaining ≤3% weight variation between strands. The four-cavity configuration on the SJZ 51/105 platform produces four 16–32 mm pipes simultaneously at 91 kW — effectively quadrupling per-kW productivity. Die heads are chrome-plated with flow channel surface roughness Ra ≤ 0.2 μm, and quick-clamp mounting enables cavity configuration changes within 45 minutes. For single-cavity large-diameter production, spiral mandrel die heads ensure uniform wall thickness with eccentricity ≤ 0.05 mm.
Both the extruder main motor and haul-off tractor are driven by imported AC variable-frequency drives with encoder-based closed-loop speed control. Extruder screw speed is maintained within ±0.5 RPM of setpoint across the full 10–45 RPM range, regardless of melt pressure fluctuations (0–35 MPa operating range). The haul-off system similarly holds line speed within ±0.1% — critical for maintaining pipe wall thickness consistency over continuous production runs. All drive parameters are programmable and stored as part of the PLC recipe system, enabling one-touch changeover between pipe specifications.
The caterpillar haul-off tractor is available in two-claw, three-claw, four-claw, six-claw, and eight-claw configurations, selected by pipe diameter and wall thickness. Claws use polyurethane contact pads with pneumatic clamping pressure adjustable from 100–800 N per pair, distributing grip force evenly to prevent pipe surface marring. The six-claw configuration for mid-range diameters (75–250 mm) provides the optimal balance of contact area and clearance, while the eight-claw unit for large-diameter pipes (315–800 mm) ensures stable traction at line speeds up to 8 m/min for heavy-wall sections.
The cutting station operates in two modes: ringless circular cutting (for pipes up to 250 mm) producing smooth, burr-free ends ideal for solvent-cement jointing, and planetary roller cutting (for 315–800 mm) with carbide-tipped blades rotating at 400–600 RPM for thick-wall sections. Both modes are governed by a dedicated PLC with a digital meter counter that triggers the cut stroke at the preset length — adjustable from 0.5 m to 12 m via the HMI. Cut-length repeatability is ±1 mm, and an automatic chip extraction blower keeps the cutting zone clean. Finished pipes are transferred to the stacker system for bundling.
The line executes six sequential stages under unified PLC supervision:
Dry-Blend Preparation — UPVC/CPVC compound (resin + stabilizer + CaCO₃ filler + processing aids) is pre-mixed in a high-speed hot/cold mixer unit. The hot mixer heats to 110°C–120°C to absorb liquid stabilizers; the cold mixer cools to 40°C to prevent thermal history buildup before extrusion.
Gravimetric Feeding — The cooled dry blend is transferred via vacuum auto-loader to the extruder hopper, with a gravimetric feeder maintaining ±0.5% dosing accuracy. For CPVC, a dedicated dryer may be required to reduce moisture content below 0.1%.
Twin-Screw Plasticizing — Material progresses through four barrel temperature zones (160°C → 170°C → 175°C → 180°C for UPVC; 175°C → 185°C → 195°C → 200°C for CPVC), reaching full gelation at 65–75% degree of fusion before entering the die.
Die Forming & Sizing — The molten PVC exits through the die head into the vacuum calibration tank. Negative pressure (–0.02 to –0.04 MPa) draws the hot pipe against water-lubricated brass sizing sleeves, setting the outer diameter and cooling the surface to approximately 50°C.
Spray Cooling & Haul-Off — Secondary spray cooling tanks reduce pipe temperature to ≤ 35°C before the haul-off pulls the pipe through a laser diameter gauge (OD accuracy ±0.03 mm) for real-time feedback control.
Cutting, Chamfering & Stacking — The PLC-controlled cutter trims to preset length; an optional chamfering station bevels pipe ends for socket-fit applications. The automatic stacker organizes finished pipes onto a storage rack, ready for quality inspection and bundling.
| Application Sector | Typical Pipe Diameter | Material | Additional Features |
|---|
| Agricultural Irrigation & Drainage | 50–315 mm | UPVC | UV-stabilized formulation, ribbed-wall option for buried use |
| Building Water Supply | 16–110 mm | CPVC | High-temperature rating (up to 93°C), low extractables for potable water |
| Building Drainage (DWV) | 32–200 mm | UPVC | Three-layer foam-core pipe for noise reduction |
| Underground Cable Protection | 16–250 mm | UPVC | High-impact formulation, color-coded (orange/red per local codes) |
| Municipal Sewer & Stormwater | 200–800 mm | UPVC | Solid-wall or structured-wall, rubber-ring joint compatible |
For complete upstream integration, Chenxing provides matching PVC compounding and mixing stations. Downstream, socket-forming (belling) machines for rubber-ring or solvent-cement joint pipes can be included in the turnkey package. All auxiliary equipment is coordinated through a single PLC architecture for unified line control.
| Your Production Goal | Recommended Configuration | Rationale |
|---|
| High-volume small-diameter (16–32 mm) electrical conduit | SJZ 51/105 + Four-cavity die (91 kW) | Four pipes per cycle maximizes output per kWh and per operator |
| Mixed small-diameter pipes (16–63 mm) for plumbing and conduit | SJZ 51/105 + Dual-cavity die (70 kW) | Two-pipe output with diameter flexibility via quick die change |
| Mid-range building drainage (20–200 mm) | SJZ 80/158 single cavity (85 kW) | Covers the most common construction pipe sizes with one extruder |
| Large-diameter municipal pipes (315–800 mm) | SJZ 105/216 single cavity (220 kW) | Parallel twin-screw torque capacity for heavy-wall SDR 26–41 pipes |
The line covers 16 mm to 800 mm across twelve extruder configurations. Small diameters (16–63 mm) benefit from dual and four-cavity dies for multiplied output. Mid-range (63–315 mm) uses single or dual cavity with conical twin-screw extruders. Large diameters (315–800 mm) employ parallel twin-screw configurations delivering up to 295 kW total power.
MOQ is 1 set per configuration. Each line is built to customer specifications — pipe diameter range, die cavity count, haul-off claw configuration, and local voltage. Trial orders for auxiliary equipment (mixer, chiller, belling machine) are accepted. Spare screw and barrel sets are also available at single-unit MOQ.
All lines are CE certified (Machinery Directive 2006/42/EC) and manufactured under ISO 9001:2015 quality management. Electrical systems comply with IEC 60204-1. Key electrical components (VFDs, PLC, contactors) carry CE and UL marks from Siemens, ABB, and Schneider Electric. Complete certification dossiers accompany each shipment.
Standard delivery is 50–60 working days from order confirmation and deposit. Large-diameter parallel twin-screw configurations (500–800 mm) may extend to 65–70 working days due to longer fabrication lead times for oversized screws and barrels. Sea freight to destination port adds 15–30 days depending on location.
Yes. The twin-screw geometry is compatible with both UPVC and CPVC. The key difference is temperature profile: CPVC requires approximately 15°C–20°C higher processing temperatures across all barrel zones and higher melt strength dies. The PLC recipe system stores separate profiles for UPVC and CPVC, enabling material changeover within one shift. Dedicated CPVC-only screw sets with higher compression ratios (2.8:1–3.2:1) are available as an option.
24-month warranty from bill of lading covering gearbox, motors, PLC, VFDs, and electrical cabinets. Wear components (screws, barrels, sizing sleeves, cutter blades, haul-off pads) carry 12 months. Warranty support is provided via video diagnosis within 48 hours; replacement parts ship via DHL Express at Chenxing's expense.
Floor space varies by configuration: small-diameter lines (16–63 mm) require approximately 25 m × 5 m; mid-range lines (63–315 mm) need 35 m × 7 m; large-diameter lines (315–800 mm) require 50 m × 10 m. Ceiling height minimum: 5 m. Utilities: 380V/50Hz 3-phase (customizable), compressed air 0.6–0.8 MPa (2.0 m³/min), cooling water 10–20 m³/hr. A reinforced concrete foundation of 300 mm thickness is recommended for the extruder base on large-diameter lines.
Match your target diameter, output volume, and pipe application. For small electrical conduit at high volume, the four-cavity configuration on SJZ 51/105 maximizes productivity. For mixed building drainage (20–200 mm), a single-cavity SJZ 80/158 covers the widest range with one machine. For municipal pipes above 315 mm, select the parallel twin-screw SJZ 92/188 or 105/216 for adequate torque.
Standard: inline laser OD gauge (±0.03 mm), melt pressure transducer (0–40 MPa), per-zone PID temperature display, and digital meter counter. Recommended add-ons: drop-weight impact tester (ISO 3127), Vicat softening point apparatus (ISO 2507), flattening test rig, and hydrostatic pressure tester for long-term rupture testing. Chenxing supplies all QC equipment as a bundled package with calibration training.
Yes. Three optional configurations are available: (a) Foam-core three-layer pipe — adds a co-extruder and three-layer die head, with the middle layer incorporating a chemical foaming agent (azodicarbonamide) for lightweight, thermally insulating drainage pipes; (b) Inner-wall spiral pipe — adds a rotating mandrel in the die head to form helical ribs inside the pipe for enhanced structural stiffness at reduced weight; (c) Hollow-wall pipe — uses a specialized die with internal air channels to create longitudinal cavities for cable protection conduits.
Remote video-guided installation is standard, covering mechanical assembly, electrical wiring, PLC commissioning, and first-batch trial production. On-site installation and training by a senior engineer (7–10 working days, customer covers airfare and accommodation) at USD 200/day. Lifetime technical support via WhatsApp/WeChat/email at ceo@cxsljx.com with guaranteed 24-hour response. Spare parts depots are maintained in Egypt, Nigeria, Vietnam, and India with commonly requested wear parts in stock. For the latest installation case studies, visit our news page.
PVC-specific screw engineering — our twin-screw geometries are developed from 20+ years of UPVC/CPVC dry-blend processing data, with optimized compression ratios (2.5:1–3.2:1) and degassing zones positioned at barrel zone 3 for maximum volatiles extraction.
Full traceability — each extruder ships with a serial-numbered inspection report, FAT video documentation, and third-party CE audit certificate specific to that machine.
Global installation footprint — 800+ extrusion lines in 70+ countries, with dedicated regional service engineers covering Southeast Asia, Middle East, Africa, and South America.
Pre-order engineering support — receive a dimensioned 2D factory layout drawing with utility connection points, foundation requirements, and material flow diagram before placing your order.
Ready to start or expand your PVC pipe manufacturing operation?
Step 1 — Share Your Requirements: Email ceo@cxsljx.com with your target pipe diameter range (mm), desired output (kg/hr), cavity configuration (single/dual/four), and local electrical specs. Response within 24 hours.
Step 2 — Receive Custom Proposal: Within 3 working days, you receive a tailored quotation with an itemized bill of materials, dimensioned factory layout drawing, and project delivery timeline.
Step 3 — Factory Acceptance Test: Before shipment, we conduct a live production trial of your pipe specification using your ordered formulation and share video documentation. You or your inspector are welcome to witness the FAT at our Zhangjiagang facility.
Step 4 — Installation & Production Launch: Our engineers guide your team through installation via real-time video, commission the PLC and all drives, and supervise the first production batch to ensure pipes meet ISO 1452 (UPVC) or ASTM D2846 (CPVC) standards.
Contact us now: ceo@cxsljx.com | +86 159 5118 7228 | Chenxing Machinery
