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Product Description
The four-cavity PVC conduit pipe machine by Chenxing Machinery is a high-density output system that extrudes four 16–32 mm PVC/UPVC electrical conduit pipes simultaneously from a single SJSZ 65/132 conical twin-screw extruder. Based on Western European extrusion technology, the line quadruples production per square meter of factory floor — four vacuum calibration tanks, four independent caterpillar haul-off units, four synchronized flying cutters, and four automatic stackers all fed by one extruder running at 250 kg/hr. For conduit manufacturers supplying the construction wiring and cable protection markets, this is the highest throughput-to-footprint ratio achievable in the 16–32 mm diameter class.
The line's core innovation is the four-tube single-control stainless steel spray calibration system: each of the four pipes passes through its own independently controlled calibration stage with dedicated vacuum level, water flow rate, and temperature regulation. Adjusting one strand's parameters to correct an OD deviation has zero effect on the other three — eliminating the cascade-defect problem that plagues shared-manifold multi-cavity calibrators. Setup is a one-time flow-balancing act at the four-cavity die head; once calibrated, all four strands run at identical quality for the duration of the production campaign. At 250 kg/hr translating to approximately 1,600 kg of finished pipe per 8-hour shift, this single line replaces the output of two to three conventional single-cavity lines — and does it with one extruder motor, one PLC, one operator, and one utility connection. For a complete turnkey extrusion solution, the line can be bundled with upstream mixing and downstream packaging equipment.
| Parameter | Specification |
|---|
| Pipe Diameter Range | 16–32 mm |
| Extruder Model | SJSZ 65/132 conical twin-screw |
| Extruder Power | 37 kW |
| Extrusion Capacity | 250 kg/hr |
| Cavity Count | 4 (four-cavity die head) |
| Calibration System | 4 × independent stainless steel spray tubes |
| Haul-Off | 4 × independent caterpillar units |
| Cutting | 4 × synchronized flying cutters |
| Stacking | 4 × automatic stackers |
| Die Change | Replaceable mould for different diameters |
| No. | Component | Quantity |
|---|
| 1 | SJSZ 65/132 Conical Twin-Screw Plastic Extruder | 1 |
| 2 | Four-Cavity Die Head (Mould) | 1 |
| 3 | Independent Vacuum Calibration Tanks | 4 |
| 4 | Independent Caterpillar Haul-Off Units | 4 |
| 5 | Independent Flying Pipe Cutters | 4 |
| 6 | Automatic Pipe Stackers | 4 |
The SJSZ 65/132 conical twin-screw extruder at 37 kW delivers 250 kg/hr of homogenized UPVC melt to a precision four-cavity die head. A chrome-plated flow distributor splits the single melt stream into four equal channels, each feeding an individual die insert. During commissioning, each cavity's flow is trimmed independently until all four pipes hit identical weight-per-meter within ±1.5% — a 15-minute procedure that pays back every shift in eliminated scrap. Once balanced, the distributor holds flow equilibrium over continuous multi-day production runs because the conical twin-screw's inherent pressure-dampening geometry suppresses melt pulsation at the die entry (pressure variance under 0.3 MPa at 22–28 MPa operating pressure). This is the same extruder platform that powers our single and two-cavity lines, meaning spare screws, barrels, and gearbox components are interchangeable across Chenxing PVC extrusion systems.
Each of the four extruded pipes enters its own stainless steel spray calibration tank with dedicated vacuum pump tap, water inlet valve, and digital temperature readout. This physical and hydraulic separation is the line's defining advantage. On a conventional multi-cavity line with a shared vacuum manifold, correcting a 0.1 mm OD overshoot on strand 2 by increasing vacuum typically drops the vacuum on strands 1, 3, and 4 by 0.02–0.04 MPa — enough to cause undersize on the neighboring strands and trigger a cascading adjustment cycle that can waste 20–30 minutes of production. Independent control eliminates this entirely: the operator adjusts strand 2's valve, strand 2's OD corrects, and strands 1, 3, 4 continue running at specification. The stainless steel construction (304 grade) withstands the mildly acidic cooling water that results from HCl traces in PVC processing — a longevity detail that matters when calibration sleeves must maintain ±0.05 mm tolerance after 10,000+ operating hours.
The four-cavity die head accepts replaceable mould inserts, enabling diameter changes across the 16–32 mm range without swapping the entire die head. A complete diameter changeover — swapping four die inserts, four calibration sleeves, and four haul-off pad sets — takes approximately 45–60 minutes with a trained crew. This means a single production shift can run 20 mm conduit for the morning and 25 mm conduit for the afternoon, responding to mixed-size customer orders without dedicating separate lines to each diameter. The die inserts are chrome-plated tool steel with flow channel surface finish Ra ≤ 0.15 μm, ensuring the inner surface of the finished conduit is smooth enough for easy wire pulling — a specification that electrical contractors check with a simple friction test on the first coil of every delivery.
Each pipe strand is pulled by its own caterpillar haul-off unit with polyurethane contact pads and pneumatic clamping (50–300 N adjustable per strand). All four haul-off motors are synchronized to a common line-speed reference from the PLC, but each unit has an independent electromagnetic clutch that allows micro-adjustment of pull force. This accommodates the slight wear-rate differences between die inserts — after 3,000 hours, insert No. 2 may produce a marginally thicker wall than insert No. 4; a fractional clutch slip on strand 2 compensates without reprogramming the PLC. Downstream, each strand has its own flying cutter that tracks pipe motion via encoder, cuts during traverse, and returns — all while the other three cutters operate on their independent timing. Cut lengths are programmable per strand from 0.5 m to 6 m, enabling mixed-length production (e.g., 3 m and 4 m conduit on the same run). For large-diameter pipes beyond 32 mm, Chenxing offers dedicated single-cavity extrusion solutions.
The total footprint of the four-cavity line is approximately 32 m × 7 m — roughly the same as two single-cavity lines. Yet it delivers four times the output of one single-cavity line, effectively halving the floor space cost per kilogram of finished pipe. Energy consumption is approximately 0.15–0.18 kWh/kg of finished conduit, compared to 0.25–0.30 kWh/kg for running two separate single-cavity lines — a 35–40% energy saving achieved by eliminating duplicate extruder motors, vacuum pumps, and PLC cabinets. Operator count: one person manages all four strands from a single HMI station, versus two to three operators for equivalent single-cavity capacity. These savings compound into a per-kilogram production cost advantage that directly improves margin on high-volume, competitive-priced electrical conduit. For manufacturers processing recycled material streams, the per-kg advantage grows further when regrind cost savings are factored in.
Dry Blend Feeding — UPVC compound (resin + stabilizer + CaCO₃ filler + processing aids) is charged into the extruder hopper via vacuum auto-loader with gravimetric dosing at ±0.5% accuracy.
Conical Twin-Screw Plasticizing — Material progresses through four PID-controlled barrel zones (160°C → 170°C → 178°C → 185°C), reaching full gelation at 65–75% fusion degree before entering the flow distributor.
Four-Cavity Die Forming — The melt stream splits into four equal channels in the chrome-plated flow distributor, each feeding a die insert that forms a pipe parison at identical temperature and pressure.
Independent Four-Tube Calibration — Each parison enters its own stainless steel vacuum calibration tank. Negative pressure (–0.02 to –0.04 MPa) draws the hot PVC against water-lubricated brass sizing sleeves; spray cooling water at 15–25°C progressively solidifies the wall.
Four-Strand Haul-Off & OD Monitoring — Each strand is pulled by its independent caterpillar unit through a laser OD gauge (±0.02 mm). All four OD readings are displayed simultaneously on the HMI, with alarm thresholds for automatic strand marking when a deviation exceeds tolerance.
Four-Strand Cutting & Stacking — Each flying cutter trims its strand to the programmed length. Four automatic stackers collect finished pipes, bundling them by diameter and length for quality inspection and packaging.
| Pipe Type | Typical Diameter | Key Standards | End-Use Sector |
|---|
| Rigid Electrical Conduit | 16–32 mm | IEC 61386, UL 651, AS/NZS 2053 | Residential, commercial, industrial wiring |
| Flexible Conduit (corrugated option) | 16–25 mm | IEC 61386-22 | Machinery and equipment wiring |
| Cable Protection / Telecom Duct | 20–32 mm | IEC 61386-24, EN 50086 | Underground and in-wall cable raceway |
| Light-Duty Water Pipe | 20–32 mm | ISO 1452 Class 6–10 | Cold water distribution, irrigation laterals |
At 250 kg/hr and approximately 0.12–0.18 kg/m for 16–32 mm conduit (wall thickness 1.0–2.0 mm), the line produces roughly 1,400–2,000 meters of pipe per hour, or 11,000–16,000 meters per 8-hour shift, divided across four strands. This fills approximately one 20-foot container with conduit coils every 4–5 production days — a rate that supports consistent export order fulfillment without overtime.
MOQ is 1 set — one extruder, one four-cavity die head, and four sets of downstream equipment. You specify your diameter mix (e.g., 20 mm and 25 mm die inserts) and local electrical requirements. No minimum annual purchase commitment. Begin with the die inserts for your current order book; additional sizes are available individually.
Yes. The line is CE certified (Machinery Directive 2006/42/EC) and built under ISO 9001:2015. The resulting conduit can be tested to IEC 61386, UL 651, and AS/NZS 2053. Electrical systems comply with IEC 60204-1. A complete technical dossier — material certificates, electrical schematics, CE declaration, and FAT report — is provided with each shipment.
Standard delivery: 45–55 working days from deposit. Installation with remote video guidance: 7–10 working days. The first specification-grade conduit is produced during commissioning. Total time-to-revenue: approximately 60–70 working days. On-site engineer support is available at USD 200/day to accelerate operator training.
The line accepts standard UPVC dry blend (K-value 65–68) from any reputable compounder. Calcium carbonate filler up to 10–15 phr is compatible for non-pressure conduit applications. Clean post-industrial PVC regrind can be incorporated at up to 20% without screw modification; above this threshold, we recommend the vented barrel option with vacuum degassing to extract volatiles that cause surface imperfections. The PLC stores separate recipe profiles for virgin and regrind blends — switch between them with one tap.
24-month warranty from bill of lading on gearbox, motor, PLC, VFDs, and electrical cabinets. 12-month warranty on wear components: screw, barrel, die inserts, calibration sleeves, cutter blades, and haul-off pads. Warranty claims are resolved via video diagnosis within 48 hours; replacement parts ship by DHL Express at Chenxing's cost. The PLC includes a remote-access diagnostic module. Stay informed on product updates through our news page.
USD 55,000–85,000 FOB Shanghai, depending on die insert set size and optional automation (auto stackers, gravimetric feeder). Compared to purchasing two single-cavity lines at approximately USD 30,000–40,000 each: the four-cavity line costs roughly the same as 1.5 single-cavity lines but delivers four times the output of one — and uses one operator, one-third the floor space, and 35–40% less energy per kilogram. Most customers achieve payback within 12–18 months on the volume uplift alone. Request a detailed ROI analysis at ceo@cxsljx.com.
Approximately 32 m × 7 m (L × W), ceiling height 5 m minimum. This includes the extruder, four calibration tanks, four haul-off units, four cutters, four stackers, and operator walkway clearance. Compare this to two single-cavity lines requiring roughly 50 m × 12 m combined — the four-cavity line reduces your floor space requirement by approximately 60%. Utilities: 380V/50Hz 3-phase (customizable), compressed air 0.6 MPa (2.0 m³/min), cooling water recirculation 12–15 m³/hr. Standard 200 mm reinforced concrete floor.
Yes. The four-cavity die head uses replaceable mould inserts. A full diameter changeover — four die inserts, four calibration sleeves, four haul-off pad sets — takes approximately 45–60 minutes with a trained two-person crew. This enables same-shift production of both 20 mm and 25 mm conduit to fill mixed-size customer orders. For frequent diameter changes, we recommend keeping a second set of calibration sleeves pre-mounted on quick-change frames to reduce changeover time to under 30 minutes.
No — this is precisely why independent control matters. If cavity 2's OD drifts out of tolerance, the operator adjusts only cavity 2's calibration valve. Cavities 1, 3, and 4 continue producing specification-grade pipe. If cavity 2's issue requires a die insert inspection, that single strand can be temporarily idled while the other three continue running — just close its flow trim valve at the distributor and stop its haul-off. You lose 25% output during the inspection, not 100%. This partial-continuity capability is the financial reason independent calibration pays for itself within months.
Yes. Masterbatch can be dosed at 1–2% into the hopper for uniformly colored conduit (gray, white, orange — the most common electrical conduit colors). For surface printing (meter marks, specification text, brand name), we offer an inline hot-foil or ink-jet printer module that mounts between the haul-off and cutter. The printer is PLC-synchronized to line speed so print registration remains consistent regardless of production rate. Multi-layer co-extrusion — e.g., a colored outer layer over a recycled-material core — is available as a line upgrade with an additional small co-extruder.
You receive: (a) Remote video-guided installation covering mechanical assembly, electrical wiring, PLC commissioning, and four-strand calibration balancing — standard with every line. (b) Operator training delivered over video call until your crew runs all four strands independently. (c) Lifetime technical support via WhatsApp/WeChat/email at ceo@cxsljx.com with 24-hour guaranteed response. (d) On-site engineer dispatch at USD 200/day (customer covers airfare and accommodation) for hands-on training or new-die commissioning. (e) Express spare parts delivery from regional depots in Egypt, Nigeria, Vietnam, and India. For integration with PET bottle recycling or similar upstream systems, our engineers provide configuration guidance at no additional charge.
Independent calibration is independently verified — each four-tube system ships with a FAT report documenting all four strands' OD traces over a 60-minute continuous production run, proving that adjusting one tube does not affect the other three.
One extruder, scalable output — the SJSZ 65/132 at 250 kg/hr is sized for four-cavity operation from day one, so you are not running an undersized extruder at its thermal limit. The screw geometry, motor rating, and gearbox are matched to sustained four-strand output.
Western European technology, cost-optimized — the line's architecture draws from technology partnerships with German and Italian extrusion specialists, adapted for competitive manufacturing markets without sacrificing the precision that conduit buyers inspect.
Full configuration transparency — receive a dimensioned 2D factory layout drawing showing all four strand paths, utility connection points, and recommended operator positions before you commit to purchase.
Ready to produce four electrical conduit pipes simultaneously with one extruder and one operator?
Step 1 — Specify Your Conduit Program: Email ceo@cxsljx.com with your target conduit diameters (mm), desired daily output (kg/shift), and which standards your market requires (IEC, UL, AS/NZS). Response within 24 hours.
Step 2 — Review Your Custom Proposal: Within 3 working days, receive a quotation with an itemized bill of materials for all six system components, a four-strand factory layout drawing, die insert specification sheet, and delivery timeline.
Step 3 — See All Four Strands Running: Before shipment, we conduct a live FAT producing your conduit specification on all four cavities simultaneously. You receive video documentation of independent OD traces, calibration settings, and finished pipe quality for all four strands.
Step 4 — Launch Four-Strand Production: Our engineers guide your team through installation via real-time video, commission all four cavity controls, balance the melt flow distributor, and supervise the first full production shift until all four strands deliver specification-grade conduit independently.
Contact us now: ceo@cxsljx.com | +86 159 5118 7228 | Chenxing Machinery
