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Product Description
The PVC Rain Gutter / Downspout Extrusion Line is a complete conical twin-screw production system engineered for manufacturing PVC rainwater gutters and downspouts — essential components of modern building drainage systems that channel roof runoff to controlled disposal points, preventing uncontrolled water from damaging walls, foundations, and pedestrian areas. Compared to traditional metal gutters, PVC gutters offer superior corrosion resistance, lower material cost, easier on-site installation, and full adaptability to diverse architectural profiles (K-style, half-round, box gutter). Built on the proven SJSZ conical twin-screw architecture — the same platform trusted across hundreds of PVC pipe extrusion lines and PVC roof tile extrusion lines worldwide — this line delivers 120–400 kg/h output across five model sizes, covering gutter widths from 120 mm (residential) to 550 mm (commercial/industrial). Chenxing Machinery provides full turnkey integration, from raw material blending through finished product stacking.
| Model | Product Max Size (W × H) | Extruder | Capacity (kg/h) | Line Length (m) |
|---|---|---|---|---|
| YF120 | 120 × 50 mm | SJSZ45/90 | 120 | 18 |
| YF180 | 180 × 50 mm | SJSZ51/105 | 150 | 20 |
| YF240 | 240 × 100 mm | SJSZ65/132 | 300 | 24 |
| YF300 | 300 × 120 mm | SJSZ65/132 | 300 | 24 |
| YF600 | 550 × 120 mm | SJSZ80/156 | 400 | 28 |
Capacities measured with standard rigid PVC gutter compound (PVC resin + CaCO₃ + stabilizers + lubricants). Actual throughput varies with profile cross-section complexity and formulation.
Power supply: 3-phase 415 V, 50 Hz (customizable to local grid). Cooling water temperature: < 15 °C. Compressed air: > 0.6 MPa.
| Component | Specification |
|---|---|
| Conical Twin-Screw Extruder | SJSZ series (SJSZ45/90 through SJSZ80/156); bimetallic barrel and nitrided screw (38CrMoAlA, HV 900–1000 surface hardness); forced-feed hopper; Siemens/ABB electrical components; high-torque gearbox with NSK bearings; Siemens PLC + HMI touchscreen with multi-zone PID temperature control |
| Co-Extruder (Optional) | SJ25–30 mm single-screw unit for ASA/PMMA anti-UV cap layer (50–100 μm thickness); independent temperature control; mounts at die entry. See our single-screw extruder range for co-extrusion applications |
| Extrusion Die Head | Die body: 45# steel, hardened and polished; internal parts: 40Cr alloy steel; calibration bushing: tin bronze; profile cross-section customized per confirmed customer drawing; supports K-style, half-round, box gutter profiles |
| Vacuum Calibration & Cooling Table | SUS304 stainless steel water tank; multiple vacuum pumps for precision sizing; water temperature maintained < 15 °C via external chiller — compatible with SML series chiller units |
| Pneumatic Belt Haul-Off Machine | Frequency-conversion variable speed drive; pneumatic clamping mechanism; speed synchronized with extruder output via PLC closed-loop control |
| Automatic Meter-Counting Cutter | Servo or frequency-controlled drive; pneumatic clamp; cut-to-length accuracy ±1 mm; pre-set cut length typically 3–6 m for container loading |
| Stacking Rack | Manual or pneumatic offloading; length matched to line specification |
| Electrical Control Cabinet | Siemens PLC + HMI touchscreen; multi-zone PID temperature controllers (6–8 heating zones); inverter drives for main motor, haul-off, and cutter; emergency stop system |
Additional upstream and downstream equipment — including plastic heating mixers for PVC dry blending, hopper dryers for moisture control, and pellet vacuum loaders for automated material conveying — can be integrated for a complete turnkey production cell. Browse our auxiliary machines catalog for full scope.
The SJSZ conical twin-screw geometry inherently provides higher torque capacity and superior conveying efficiency compared to parallel twin-screw designs, making it the industry-preferred choice for PVC gutter compounds with high CaCO₃ loading (typically 20–40 phr). The bimetallic barrel — with a wear-resistant alloy liner centrifugally cast onto the steel outer shell — combined with nitrided 38CrMoAlA screws (surface hardness HV 900–1000), delivers extended service life under abrasive filler conditions. Multi-zone PID temperature control maintains barrel temperatures within ±1 °C across 6–8 zones (typically 160–195 °C for rigid PVC), ensuring consistent melt quality without thermal degradation. For operations requiring higher throughput, the high-output single-screw extruder platform can serve as a co-extrusion or complementary line.
The extrusion die head is fully engineered to the customer's confirmed profile drawing — whether K-style, half-round, or box gutter — rather than restricted to a fixed catalog shape. Die body construction uses 45# carbon steel that undergoes quenching, tempering, and precision polishing to Ra ≤ 0.4 μm surface finish, minimizing PVC melt adhesion and die-lip build-up. Internal flow-channel components are machined from 40Cr alloy steel, and the calibration bushing at the die exit uses tin bronze (Stannum bronze) for its combination of thermal conductivity and wear resistance. Width is adjustable per specification, and the tooling set accommodates quick profile changeover — a significant advantage for manufacturers serving diverse regional architectural standards with a single line. After production, PVC profiles can be further enhanced with surface texture using a plastic embossing machine.
An optional SJ25–30 mm single-screw co-extruder applies a 50–100 μm ASA (acrylonitrile-styrene-acrylate) or PMMA (polymethyl methacrylate) cap layer onto the gutter surface during extrusion. This UV-resistant outer layer protects the underlying PVC from photodegradation — the primary failure mode for outdoor PVC building products — extending color retention and impact resistance beyond 10 years of direct sun exposure. The co-extruder features independent temperature control and a dedicated melt channel integrated into the main die head, ensuring uniform cap-layer distribution across the full profile width without delamination risk.
The vacuum calibration table uses multiple independently controlled vacuum pumps and precision sizing sleeves to hold the extruded gutter profile to a dimensional tolerance of ±0.3 mm before it enters the water cooling section. The entire cooling tank is fabricated from SUS304 stainless steel for corrosion resistance against chlorinated water and long-term structural integrity. Water temperature is maintained below 15 °C via a closed-loop chiller circuit — essential for achieving stable dimensional calibration with PVC, which requires rapid surface cooling to lock in the profile shape before subsequent shrinkage can cause distortion. For material handling upstream, a vacuum conveyor loader ensures clean, dust-free feeding of compound into the extruder hopper.
The cutting station uses a servo-driven or frequency-controlled traverse mechanism with pneumatic clamping. A digital meter counter triggers the cut cycle at the pre-set length, achieving ±1 mm cut-to-length accuracy at line speeds up to 3–5 m/min. The pneumatic clamp grips the moving profile during the cut cycle, then releases immediately after blade retraction — the entire cut-and-return sequence completes within the inter-cut interval without interrupting extrusion. Standard cut lengths are 3–6 m, optimized for 20-ft and 40-ft container loading to minimize freight cost per linear meter of finished product.
The YF series spans five throughput classes, enabling manufacturers to match line capacity precisely to market demand:
| Model | Gutter Width Range | Target Application |
|---|---|---|
| YF120 | Up to 120 mm | Residential small-section gutters and downspouts |
| YF180 | Up to 180 mm | Standard residential rainwater systems |
| YF240 | Up to 240 mm | Mid-range residential and light commercial |
| YF300 | Up to 300 mm | Commercial and multi-story residential buildings |
| YF600 | Up to 550 mm | Industrial, institutional, and large commercial projects |
Downstream, a pipe coiler can handle flexible PVC or PE downspout coiling if the product mix extends beyond rigid profiles.
The Siemens PLC-based control system centralizes all line parameters — extruder barrel temperatures (6–8 zones), screw RPM, haul-off speed, vacuum pump status, and cut-length settings — on a single HMI touchscreen. Recipe storage allows operators to save and recall complete parameter sets for different gutter profiles, reducing changeover setup time. Multi-zone PID loops maintain temperature setpoints at ±1 °C deviation, and the extruder main drive, haul-off, and cutter motors use inverter drives for energy-efficient speed regulation and soft-start protection.
Step 1 — Raw Material Dry Blending: PVC resin, CaCO₃ filler (20–40 phr), heat stabilizers, lubricants, impact modifiers, and TiO₂ pigment are metered and mixed in a high-speed heating mixer to produce a homogeneous dry blend. A plastic heating mixer with hot/cold mixing stages ensures consistent bulk density and eliminates moisture before extrusion. For moisture-sensitive formulations, an upstream hopper dryer is recommended.
Step 2 — Melt Plasticizing & Homogenization: The dry blend is fed into the conical twin-screw extruder's forced-feed hopper. Material is conveyed through the multi-zone heated barrel (typically 160–195 °C across 6–8 zones), where counter-rotating intermeshing screws provide intensive shear and distributive mixing. The conical geometry's progressively decreasing channel depth compacts the material while generating the shear heat necessary for complete gelation.
Step 3 — Profile Extrusion Through Custom Die: The homogenized melt enters the extrusion die head, where the custom-shaped flow channel — machined per the confirmed profile drawing — transforms the cylindrical melt stream into the target gutter cross-section. If the optional ASA/PMMA co-extruder is configured, the cap layer is applied at this stage through a dedicated melt channel in the die head.
Step 4 — Vacuum Calibration & Water Cooling: The hot extrudate passes directly into the vacuum calibration tank, where precision sizing sleeves (tin bronze) and multiple vacuum pumps hold the profile to the target dimensions while SUS304 stainless steel water tanks rapidly cool the surface. Water temperature is maintained below 15 °C via a closed-loop SML series chiller to lock in dimensional stability.
Step 5 — Belt Haul-Off at Synchronized Speed: The pneumatic belt haul-off grips the cooled profile and pulls it through the line at a speed precisely synchronized with extruder output via the PLC closed-loop control system. Frequency-conversion drive enables stepless speed adjustment to match different profile cross-sections and throughput rates.
Step 6 — Automatic Cutting, Stacking & Packaging: The automatic meter-counting cutter severs the continuous profile at pre-set lengths (standard 3–6 m). Cut pieces offload onto the stacking rack for inspection, then proceed to packaging. Finished gutters are typically bundled with protective film and strapped for container loading. For operations that also produce pelletized compound, a plastic pelletizer machine can be integrated for in-house recycling of start-up scrap and edge trim.
For PVC rain gutter extrusion, CaCO₃ loading typically ranges from 20 to 40 phr (parts per hundred resin), balancing material cost reduction against impact strength and weatherability requirements. At the upper end (35–40 phr), the formulation's melt viscosity increases and abrasiveness rises, which is why the SJSZ conical twin-screw design is preferred: its progressively decreasing channel depth provides higher compaction force and shorter residence time than parallel twins, reducing thermal degradation risk. The bimetallic barrel (centrifugally cast wear-resistant alloy liner) and nitrided 38CrMoAlA screws with HV 900–1000 surface hardness are specified to handle filler abrasion over multi-year production cycles. We recommend starting trials at 25–30 phr and adjusting based on your regional impact strength standards and raw material costs. For operations processing recycled PVC regrind with unknown filler content, our shredder-extruder recycling solutions provide pre-processing before the extrusion line.
ASA and PMMA cap layers function as sacrificial UV shields for the underlying PVC substrate. Standard uncoated rigid PVC gutters begin showing visible chalkiness and color shift after 2–3 years of direct tropical/subtropical sun exposure due to dehydrochlorination initiated by UV radiation. A 50–100 μm ASA cap layer — applied via the SJ25–30 mm single-screw co-extruder — absorbs and dissipates UV energy before it reaches the PVC layer, extending aesthetic service life to 10+ years. The co-extrusion die head's integrated melt-channel design ensures the cap layer bonds molecularly with the PVC substrate during extrusion, eliminating delamination risk. PMMA offers even higher gloss retention in premium markets. The co-extruder is independent from the main extruder, so operators can run the line with or without the cap layer — useful for manufacturers serving both premium (with ASA) and economy (without) market segments from the same line.
A complete die head changeover — including removing the existing die set, cleaning the melt channels, installing the new profile tooling, and bringing the line to thermal equilibrium — typically requires 2–4 hours with two experienced operators. The die head is designed with a split-body construction and quick-release clamping bolts to facilitate tooling swaps. The calibration tank's sizing sleeves and vacuum blocks are also profile-specific and must be exchanged in parallel. Pre-heating the replacement die to 160–170 °C on a dedicated pre-heat station can reduce changeover time by approximately 30–45 minutes. To minimize production disruption, many manufacturers batch-produce each profile type in multi-day runs and schedule die changes during shift transitions or maintenance windows. The PLC's recipe storage function allows instant recall of all process parameters (temperatures, speeds, vacuum levels) for each stored profile, eliminating the manual re-tuning that previously consumed an additional 1–2 hours per changeover.
Both YF240 and YF300 models (SJSZ65/132 extruder, 300 kg/h nominal capacity) require cooling water at < 15 °C with a flow rate of approximately 8–12 m³/h to maintain stable calibration temperatures across the SUS304 stainless steel cooling tank. For tropical or arid regions where ambient water temperatures exceed 20 °C, an SML series chiller of 10–15 HP capacity is mandatory — attempting to run with warm water results in incomplete surface cooling, dimensional drift, and profile warping. Compressed air must be supplied at > 0.6 MPa (approximately 6 bar / 87 psi), with a minimum flow capacity of 0.8 m³/min to serve the pneumatic clamping systems on both the haul-off and cutter stations simultaneously. An air receiver tank of ≥ 300 L and a refrigerated air dryer are recommended to ensure consistent pressure and moisture-free operation, preventing pneumatic valve sticking that can cause cutting synchronization errors. A pellet vacuum loader for hopper feeding can share the compressed air supply if a centralized system is used.
To begin die head design, we require a dimensioned cross-section drawing (CAD format: DWG, DXF, or STEP) showing the complete gutter profile with all wall thickness callouts (typically 1.5–2.5 mm for residential, 2.0–3.5 mm for commercial sections), internal rib positions, and any snap-fit or connector features at the edges. If a CAD file is unavailable, a hand sketch with all critical dimensions annotated is sufficient for quoting. For new profiles not previously manufactured, we also request the target PVC compound formulation (resin K-value, CaCO₃ loading, impact modifier type) to calculate die swell compensation factors — a critical step to ensure the extruded profile matches the drawing dimensions rather than running oversize. Tooling fabrication lead time is 25–35 working days from drawing confirmation, including: die flow-channel simulation (3–5 days), CNC machining and EDM wire-cutting (12–15 days), heat treatment and polishing (5–7 days), and assembly with trial extrusion at our Zhangjiagang factory (3–5 days). Rush orders can be accommodated at 18–22 working days with an expediting surcharge.
Proven SJSZ Platform. The SJSZ conical twin-screw series is deployed across hundreds of PVC extrusion facilities worldwide — from PVC pipe extrusion lines to PVC roof tile extrusion lines. Every gutter extrusion line is factory-tested with customer-supplied formulation samples before shipment, validating screw configuration and process parameters against your actual raw materials.
Integrated Single-Source Ecosystem. Chenxing manufactures the full upstream and downstream equipment chain — plastic heating mixers for dry blending, hopper dryers for moisture control, pellet vacuum loaders and vacuum conveyor loaders for automated material handling, SML series chillers for process cooling, and plastic pelletizer machines for scrap recycling. A single-source supplier simplifies commissioning, spare parts management, and lifetime service. Browse our complete product catalog and auxiliary machines.
Custom Die Engineering. Unlike suppliers offering only fixed-catalog profiles, Chenxing's in-house tooling workshop designs and fabricates each die head to the customer's confirmed gutter profile drawing — K-style, half-round, box gutter, or custom architectural sections. Every die undergoes flow-channel simulation before machining to ensure uniform melt distribution across the full cross-section, minimizing post-extrusion warpage.
Recycling Integration. For manufacturers seeking closed-loop production, Chenxing offers integrated shredder-extruder recycling solutions that reprocess start-up scrap, edge trim, and off-spec profiles back into pelletized compound for re-extrusion.
Global Support. Chenxing Machinery, headquartered in Zhangjiagang, Jiangsu, provides remote commissioning guidance via video call, optional on-site technician dispatch for installation and training, and lifetime technical support. Visit our solutions page for application-specific configurations, read the latest news and case studies, or learn more about us.
Step 1 — Share Your Gutter Profile Drawing: Send your dimensioned cross-section drawing (DWG, DXF, STEP, or annotated sketch) showing all wall thicknesses and features. If you have multiple profiles, include all variants — we will design tooling sets accordingly.
Step 2 — Specify Your Material & Output Target: Tell us your PVC compound formulation (resin grade, CaCO₃ loading, stabilizer system), whether you need ASA/PMMA co-extrusion, and your target throughput in kg/h. Our engineering team maps your requirements to the optimal YF model.
Step 3 — Receive a Custom Proposal: Within 24 hours, you receive a tailored configuration including extruder model, die head design scope, auxiliary equipment recommendations, floor plan layout, and FOB/CIF quotation — all based on your specific profile and production environment.
Step 4 — Validate with a Sample Trial (Optional): Send 25–50 kg of your PVC compound to our Zhangjiagang factory for a trial extrusion run. We produce sample gutter profiles using your tooling, record throughput, dimensional accuracy, and surface quality data, and ship the samples for your physical evaluation before final commitment.
Contact Nicole directly:
Phone WeChat WhatsApp: +8615951187228
Email: ceo@cxsljx.com
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