PVC / WPC Profile Extrusion Line

Overview

The PVC/WPC profile extrusion line by Chenxing Machinery is a six-model series — YF180, YF240, YF400, YF600, YF800, and YF1000 — spanning a profile width capacity of 180 mm to 1,000 mm. Each line is built around a conical twin-screw extruder sized to the application, feeding a modular downstream system of vacuum calibration table, caterpillar haul-off, precision cutter, and automatic stacker. The production line serves both pure PVC profiles (ceilings, window frames, door frames, wall panels, cornices) and wood-plastic composite (WPC) profiles (decking, fencing, railing, cladding) — one extrusion platform, two material families, and the ability to switch between them by changing the die, calibration tooling, and screw temperature profile.

The conical twin-screw architecture is the critical enabler. Unlike parallel twin-screws, the conical geometry self-compacts low-bulk-density materials — WPC dry blends with 30–70% wood flour, or high-filler rigid PVC formulations — by progressively reducing the channel cross-section from feed zone to metering zone. This eliminates the need for a crammer feeder on most formulations and reduces the risk of bridging in the hopper throat that plagues parallel-screw lines processing fluffy wood-fiber blends. For manufacturers entering the WPC decking or PVC window profile market, this line's ability to run 50–60% wood flour content while maintaining 120–250 kg/hr output is the difference between a profitable product and one that costs more in raw material than the market will pay. The full Chenxing product range includes purpose-built upstream and downstream modules that can be configured to your exact annual tonnage target.

Model Selection & Technical Parameters

Model selection guide: YF180 and YF240 are optimized for narrow decorative profiles — cornice strips, edge trims, picture frames, and cable channels where dimensional precision on small cross-sections outweighs raw throughput. YF400 sits at the volume crossover point, suitable for medium-width building profiles — door frames, window sills, and wall paneling up to 400 mm. YF600 through YF1000 are engineered for wide-format building panels — WPC decking, PVC ceiling panels, wall cladding, and door leaf boards — where the constraint is cooling capacity (kW of heat removed per linear meter of profile) rather than extruder output. For plants planning to run high-volume pipe production in parallel, the extruder and mixing station can be purchased separately and configured for multi-line operation with a shared material handling system.

System Configuration

● = Standard configuration   ○ = Recommended option

Core Features

Conical Twin-Screw Extruder — Built for the Density Challenge of WPC and Filled PVC

The conical twin-screw extruder is not an interchangeable commodity — its ability to process wood-plastic composites at commercially viable throughputs depends on three design parameters that vary significantly between manufacturers: compression ratio, L/D ratio, and screw metallurgy. Chenxing's conical screws are manufactured with a progressively decreasing channel depth from feed to metering zone, achieving a volumetric compression ratio of 2.8:1–3.2:1 across the screw pair. This is intentionally higher than the 2.0:1–2.4:1 typical of general-purpose PVC screws, because WPC dry blend — with its 30–70% wood flour content — enters the extruder at a bulk density of 0.35–0.50 g/cm³ and must be compacted to approximately 1.1–1.3 g/cm³ for void-free profile extrusion. A lower-compression screw simply cannot achieve melt homogeneity at the die entry, resulting in surface roughness, internal voids, and inconsistent density along the profile length.

The screw and barrel are constructed from nitrided 38CrMoAlA steel with a surface hardness of HV 900–1000 and a nitriding depth of 0.5–0.7 mm. This metallurgy choice is driven by the abrasive nature of wood flour — even at 200-mesh particle size, the silica content of natural wood fibers (0.1–0.5% by weight) causes measurable wear on untreated screw flights after 2,000–3,000 operating hours. Nitrided surfaces extend this to 8,000–10,000 hours before reconditioning, which is performed by re-nitriding rather than full replacement — a cost difference of USD 800 vs. USD 5,000 per screw pair. For manufacturers processing formulations above 60% wood flour or incorporating mineral fillers (CaCO₃, talc), we offer an optional bimetallic barrel with a Ni-based alloy liner (hardness HRC 58–62) that pushes the reconditioning interval past 15,000 hours. Learn more about our material science approach on the Chenxing solutions page.

Modular Die System — One Line, Multiple Profiles, Rapid Changeover

The die head is custom-machined per profile geometry, but the mounting flange, heating band interface, and melt thermocouple port are standardized across all six YF models of the same width class. This modularity delivers three operational benefits: (a) a YF600 line producing 400 mm WPC decking can switch to 300 mm PVC wall panels by swapping the die, calibration table tooling, and haul-off pad contour — approximately 2–3 hours of changeover with a trained crew, versus a full day on lines with proprietary die mounts; (b) spare dies for different profile shapes are inventoried at the profile shapes level rather than the machine level, so adding a second door-frame profile to your catalog means commissioning one die, not a complete line; (c) die flow-channel design is performed in-house using computational fluid dynamics (CFD) simulation, with the flow-channel cross-section profiled to deliver uniform melt velocity across the entire die exit — critical for asymmetric profiles where the left wall is 2 mm thick and the right wall is 4 mm thick, and an unoptimized die would starve the thicker section while overfilling the thinner one.

Vacuum Calibration Table — Dimensional Stability Starts in the First 600 mm

The vacuum calibration table uses a water-circulating stainless steel calibration sleeve with precisely machined internal geometry matched to the target profile shape. The extruded profile — still above its glass transition temperature (approximately 82°C for rigid PVC, 75–85°C for WPC depending on wood content) — is drawn through the sleeve under 0.02–0.04 MPa negative pressure, which pulls the hot polymer against the water-lubricated sleeve walls. Water temperature in the calibration circuit is maintained at 15–22°C by a closed-loop chiller; if the water is too cold (below 12°C), the profile skin freezes instantly and traps a molten core that continues to shrink after exiting the calibration zone, causing post-extrusion warpage that appears 2–4 hours later during QC inspection. If the water is too warm (above 25°C), the profile exits the calibration table soft and deforms under its own weight before reaching the haul-off.

The calibration table length is matched to the line's drawing speed to guarantee the profile spends a minimum of 45–60 seconds under active vacuum cooling. For high-output lines running 3–5 m/min, this means a calibration table length of 4–6 meters. For hollow profiles (window frames with internal chambers, door panels with stiffening ribs), the vacuum is applied through a segmented calibration sleeve — each chamber gets an independent vacuum circuit so that a thin-wall chamber (1.2 mm) does not collapse while a thick-wall chamber (2.5 mm) is still drawing properly. This segmented approach is the difference between 98% first-pass yield and 85% — on a line producing 800 kg/shift, a 13-point yield gap equals over 100 kg of regrind per shift. For extrusion plants already operating material recycling systems, the online regrind can be immediately reprocessed, but the energy cost of re-extruding 100 kg/shift still erodes margin.

Caterpillar Haul-Off — Constant Tension Without Profile Distortion

The caterpillar haul-off uses polyurethane contact pads contoured to the specific profile shape, with pneumatic clamping pressure adjustable from 50–500 N depending on profile wall thickness. The drive motor is AC servo-controlled and synchronized to the extruder screw RPM via the main PLC — this closed-loop speed control maintains drawing speed within ±0.5% of setpoint, preventing the "surging" effect where periodic speed fluctuations create thickness bands visible on the finished profile surface. The haul-off pulling force scales with model size: 15 kN on the YF180 (sufficient for small decorative profiles), up to 50 kN on the YF800 and YF1000 (required for pulling wide, heavy decking boards through the calibration sleeve against vacuum friction). A digital encoder on the haul-off drive shaft feeds linear speed data to the flying cutter, so cut length accuracy of ±1 mm is maintained regardless of line speed changes.

Flying Cutter & Automatic Stacker — Cut-to-Length Without Line Stoppage

The flying cutter tracks the moving profile via an encoder-synchronized carriage — the saw blade assembly accelerates to match profile speed before the cut, executes the transverse cut during the synchronized travel window (typically 0.3–0.5 seconds for a 600 mm board), then retracts and returns to home position. Saw blade RPM and feed rate are programmable per profile material: WPC requires a lower blade speed (2,500–3,000 RPM) and slower feed to prevent melting and re-welding of the thermoplastic matrix at the cut face; rigid PVC can be cut at 4,000–5,000 RPM for a clean, burr-free edge. The automatic stacker receives cut profiles and stacks them in counted bundles, with an optional automatic wrapping station for stretch-film packaging before palletizing.

Production Process

1. Raw Material Preparation — PVC resin (K-value 65–68 for rigid profiles, 58–60 for WPC matrix) is blended with stabilizers, lubricants, impact modifiers, and processing aids in a hot-cool mixing unit at 110–120°C hot / 40–45°C cool. For WPC, wood flour (80–200 mesh, moisture content ≤1.0%) is added during the cool-mix phase to prevent thermal degradation.

2. Conical Twin-Screw Plasticizing — The dry blend enters the extruder hopper and progresses through four barrel heating zones (160°C → 170°C → 178°C → 185°C for rigid PVC; 150°C → 160°C → 170°C → 175°C for WPC to avoid wood flour browning). Screw RPM is set to achieve a melt temperature of 185–195°C at the die entry, measured by an immersion thermocouple in the adapter.

3. Die Forming — The homogenized melt passes through the profile die, where the flow channel distributes material across the cross-section geometry. Die exit temperature: 190–195°C. Die land length-to-gap ratio: 10:1 to 15:1 for balanced flow.

4. Vacuum Calibration & Cooling — The hot profile enters the calibration table immediately after die exit (gap ≤15 mm). Negative pressure pulls the profile against water-cooled calibration sleeves. Cooling water at 15–22°C progressively solidifies the profile from the skin inward over the 4–6 meter calibration length.

5. Haul-Off & Dimensional Monitoring — The caterpillar haul-off pulls the profile at a constant 0.5–5 m/min. An inline laser micrometer measures width and thickness at 2 readings/second; out-of-tolerance profiles trigger an automatic marking system and are segregated at the stacker.

6. Cutting & Stacking — The flying cutter trims to programmed length (±1 mm). Automatic stacker collects and counts, bundling for QC sampling and palletizing. For profiles headed to global export markets, optional in-line printing adds batch codes and meter marks before cutting.

Application Spectrum

FAQ

1. How does wood flour content in WPC formulation affect the extruder's throughput and screw lifespan?

Wood flour loading is the single largest variable controlling both throughput and maintenance intervals on a WPC profile line. At 30–40% wood flour, the melt viscosity is dominated by the PVC matrix and the line can sustain 90–95% of its nominal rigid PVC throughput. At 50–60%, throughput typically drops by 15–25% because the higher-viscosity melt requires lower screw RPM to avoid exceeding the extruder's torque limit and to prevent localized overheating at the screw tip where shear heating is most intense. At 65–70% — the upper formulation limit for structural profiles — throughput can fall to 60–70% of rigid PVC capacity. On screw lifespan: every 10% increase in wood flour content above 40% reduces the nitrided screw reconditioning interval by approximately 1,000–1,500 operating hours due to the proportional increase in silica abrasion per kilogram of throughput. We recommend manufacturers targeting above 55% wood flour specify the bimetallic barrel option at purchase — the incremental cost of USD 3,000–5,000 is typically recovered within the first screw-reconditioning cycle avoided.

2. What determines whether a given profile shape can run at 5 m/min versus being limited to 1.5 m/min?

Drawing speed — and therefore daily output — is constrained by cooling rate, not extruder capacity. The limiting equation is: drawing speed = (calibration table length) ÷ (minimum residence time under active cooling). The minimum residence time is determined by the thickest wall section in the profile cross-section — a 3 mm wall requires roughly 60–80 seconds to solidify through its full thickness at 18°C cooling water; a 1.5 mm wall might require only 30–40 seconds. On a 5-meter calibration table, the thick-wall profile is limited to 3.75–5.0 m/min; the thin-wall profile could theoretically run at 7.5–10 m/min but is capped by the haul-off's 5 m/min maximum. This is why two customers with the same YF600 line can report vastly different daily outputs: one runs a simple 1.5 mm PVC ceiling panel at 5 m/min (approximately 250 kg/hr), the other runs a complex 3.5 mm WPC decking board with internal ribbing at 2 m/min (approximately 140 kg/hr). The extruder could feed faster, but the profile would exit the calibration table with a molten core and warp within hours.

3. What cooling strategy minimizes post-extrusion warpage in asymmetric profiles?

Asymmetric profiles — window frames where the left jamb is 35 mm deep and the right jamb is 25 mm deep, or door panels with a decorative groove on one face — inherently cool at different rates across their cross-section. The thicker section retains heat longer and continues to shrink after the thinner section has fully solidified, creating a bending moment that manifests as lengthwise curvature. The countermeasure is differential cooling: each circuit of the calibration sleeve is supplied with independently temperature-controlled water, with the thicker section receiving water at 13–15°C (faster cooling) and the thinner section at 18–22°C (slower cooling), equalizing the exit temperature across the cross-section to within ±3°C. This is achieved by segmenting the calibration sleeve's water channels and controlling each segment with its own thermostatic valve. Without differential cooling, warpage rates on asymmetric window profiles can reach 15–20% on a single-cavity line; with it, rates drop below 3%. The payback on the thermostatic valve investment is measured in weeks of recovered scrap.

4. How does the conical twin-screw compare to parallel twin-screw for WPC processing?

Conical twin-screws hold a decisive advantage in three specific areas for WPC: (a) feed-zone volume — the larger-diameter rear section of conical screws provides 30–40% more intake volume than a parallel screw of equivalent output, accommodating the low bulk density of wood-filled dry blends without a crammer feeder; (b) self-compaction — the converging geometry compresses material progressively along the entire screw length rather than concentrating compression at a single Maddock or blister section, which reduces the shear spikes that cause localized wood flour burning at 175°C+; (c) bearing life — the conical screw's thrust bearing absorbs axial forces over a larger-diameter rear thrust face, distributing the load that, on a parallel screw, concentrates on a smaller bearing that typically requires replacement at 12,000–15,000 hours versus 18,000–22,000 hours on a conical design. The trade-off is that conical screws are more expensive to manufacture (approximately 20–30% higher cost) and cannot be interchanged between different models. For pure PVC dry blend, parallel and conical screws perform comparably; for WPC above 40% wood flour, conical is the industry-standard choice. For operations also running recycled material lines, the conical geometry's tolerance for inconsistent bulk density is a significant operational advantage when processing post-industrial regrind.

5. What energy consumption should a profile extrusion plant benchmark against, and where are the hidden losses?

A well-tuned PVC/WPC profile line should target 0.28–0.35 kWh/kg of finished profile, measured at the main electrical panel including extruder, calibration table pumps, haul-off, cutter, and stacker. The breakdown is approximately: extruder 70%, vacuum pumps 15%, cooling water circulation 10%, downstream equipment 5%. The two most common hidden losses: (a) extruder barrel heaters competing with overcooling — if the cooling water jacket around barrel zone 3 is running too cold (below 140°C jacket temperature), the barrel heater in that zone cycles on continuously to compensate, adding 5–8% to total energy consumption while contributing nothing to melt quality; the fix is to tune the PID autotuning parameters so that barrel cooling water flow is minimized and the setpoint is maintained primarily by shear heating from screw rotation. (b) Vacuum pump running at full capacity regardless of calibration demand — if the calibration sleeve vacuum circuit has air leaks around the profile entry seal, the vacuum pump motor runs at 100% duty cycle to maintain setpoint; fixing the seal reduces pump energy by 20–30%. We recommend a one-time energy audit during commissioning — our engineers use a portable power analyzer to map kWh/kg across all six machine sections, and the resulting optimization typically pays back the audit cost in under 3 months of electricity savings. This is documented in our technical knowledge base.

6. What process parameters most influence the surface quality of WPC decking, and how do you diagnose the root cause of a finish defect?

WPC decking surface defects fall into three root-cause categories, each with a distinct visual signature: (a) melt fracture / sharkskin — a regular, fine-scale transverse roughness pattern appearing at high line speeds, caused by the melt exceeding its critical shear stress at the die land wall; the fix is to increase die temperature by 3–5°C (reducing viscosity at the wall interface) or add 0.2–0.5 phr external lubricant (PE wax or paraffin) to the formulation to create a slip layer. (b) Wood flour burn spots — dark brown or black specks on the surface, caused by wood flour particles lodging at hot spots (typically the screw tip or adapter wall) and thermally degrading there before releasing into the melt stream; the fix is to reduce screw RPM by 10–15% and increase the feed-zone barrel temperature by 5°C to soften the wood flour earlier in the screw, reducing the dry-friction hotspots that cause localized burning. (c) Die lines / longitudinal streaks — continuous lines along the profile length, caused by a scratch, buildup, or flow disruption at the die land exit; the fix requires pulling the die, polishing the land surface with 600-grit diamond paste, and verifying the flow-channel surface finish under 10× magnification (target Ra ≤0.1 μm). Each defect type points to a different section of the process; misdiagnosing a melt fracture as a die line and polishing the die wastes 4–6 hours of production with no improvement.

7. How should a manufacturer approach the transition from pure PVC profiles to WPC — what changes beyond the formulation are required?

The transition from pure PVC to WPC profile production involves five system-level changes beyond simply changing the formulation recipe: (a) extruder screw metallurgy upgrade — if the existing screw is standard nitrided steel, it will experience accelerated wear from wood flour silica within 2,000 hours; preemptively re-nitriding or replacing with a bimetallic screw eliminates a predictable mid-production failure. (b) Venting configuration — WPC formulations with wood flour above 1.0% moisture content (common in tropical sourcing regions) require a vacuum vent port at barrel zone 3–4 to extract steam before it creates internal voids in the profile; this is not needed for pure PVC lines and may require a barrel section replacement. (c) Die land length — WPC melt has 50–100% higher viscosity than pure PVC at the same temperature, requiring a 20–30% longer die land to achieve the same flow distribution; existing PVC dies repurposed for WPC without land modification will produce profiles with inconsistent wall thickness. (d) Cooling capacity — WPC retains heat longer than pure PVC because wood flour acts as a thermal insulator within the polymer matrix; cooling water flow rate and chiller capacity should be upsized by 30–40% for the same profile cross-section and line speed. (e) Haul-off pad material — the higher pull-force requirement for WPC (due to increased friction in the calibration sleeve) accelerates wear on standard polyurethane pads; switching to a higher-durometer formulation (Shore A 90–95 vs. standard 80–85) extends pad life from 3–4 months to 6–8 months. Budget approximately 4–6 weeks and USD 15,000–25,000 for the mechanical conversion, excluding new die costs. Our engineers provide a detailed transition checklist and can supervise the first WPC production run via video call.

8. What inline quality control instrumentation should be specified on a new profile line to reduce downstream QC labor?

Three instruments deliver the highest ratio of QC value to capital cost: (a) Laser micrometer (USD 2,000–3,500) — continuous width and thickness measurement at 2 Hz, with programmable tolerance bands that trigger an audible alarm and automatic spray-marker when a profile drifts out of spec; this catches dimensional drift during a production shift before 500 meters of out-of-tolerance profile are stacked and require regrinding. (b) Inline weigh-scale conveyor (USD 4,000–6,000) — measures grams per linear meter immediately after the haul-off, detecting formulation drift (e.g., a feeder calibration error causing ±3% CaCO₃ deviation) that would not be visible to a micrometer but would change the profile's density and impact strength by 8–12%. (c) Surface inspection camera (USD 8,000–15,000) — a line-scan camera with machine-vision software trained on the specific profile's acceptable surface, flagging die lines, burn spots, and surface roughness at line speed. The camera's return on investment is in reduced end-of-line visual inspection labor: one camera replaces one QC inspector per shift for surface defect detection, with better consistency over an 8-hour shift. For plants shipping to international buyers with strict surface quality specifications, the camera's image archive also provides proof of 100% inspection for each production batch.

9. What causes dimensional drift during a production run, and how do you stabilize long-run consistency?

Dimensional drift — where profile width or thickness gradually changes over a 4–8 hour production run — has four common root causes, all of which can be diagnosed by logging and trending the extruder's process parameters: (a) Screw temperature creep — as the extruder gearbox oil warms up over the first 2–3 hours of a shift, the screw's effective temperature increases by 3–5°C due to conducted heat from the thrust bearing, reducing melt viscosity and causing the profile to swell slightly at the die exit; the countermeasure is a gearbox oil temperature controller (set to 40–45°C) that stabilizes the thermal environment within 30 minutes of startup. (b) Hopper material segregation — as the dry blend hopper is emptied and refilled, finer particles (wood flour, CaCO₃) percolate to the bottom and are fed preferentially during the hopper's lower-third phase, changing the effective formulation by 2–4%; the countermeasure is a gravimetric blender that doses each component by weight rather than relying on volumetric feeders that assume consistent bulk density. (c) Cooling water temperature drift — if the chiller's setpoint is maintained but the ambient factory temperature rises from 25°C in the morning to 35°C in the afternoon, the actual cooling water temperature reaching the calibration sleeve can drift 3–5°C above setpoint due to heat gain in uninsulated piping; insulating the return-water piping and adding a temperature sensor at the calibration table inlet (rather than at the chiller outlet) closes this control loop. (d) Die lip buildup — over 4–6 hours, degraded PVC or wood flour residue accumulates on the die lip, effectively reducing the die gap by 0.02–0.05 mm; the countermeasure is a scheduled 2-minute die-lip wipe with a brass scraper every 4 hours, which is a staffing and discipline issue rather than a machine issue. Implementing all four countermeasures on a YF600 line typically reduces dimensional drift from ±0.5 mm to ±0.15 mm over an 8-hour shift.

10. How should a factory layout be designed around a profile extrusion line to maximize material flow efficiency?

Optimal layout places the extruder line as the central spine with raw material storage on the intake side and finished product logistics on the output side, avoiding cross-traffic that introduces forklift hazard zones and material contamination risk. Specific dimensions: (a) Raw material staging area of 4 m × 6 m immediately behind the extruder hopper, with the hot-cool mixer positioned within 3 meters of the hopper inlet to minimize the pneumatic conveying distance (longer conveying runs above 8 meters risk material segregation in the airstream). (b) The calibration table, haul-off, cutter, and stacker are arranged in a straight line extending 18–25 meters from the extruder die face (model-dependent), with a minimum 1.5-meter walkway on both sides for operator access and QC sampling. (c) The stacker output should face a 3 m × 5 m pallet staging area within 2 meters of the stacker exit, so bundled profiles can be transferred without an intermediate forklift move. (d) Regrind handling — a dedicated granulator located within 5 meters of the stacker (but separated by a sound-insulating partition rated for 75 dBA reduction) receives QC-rejected profiles directly, and the regrind flake is pneumatically returned to a dedicated surge bin above the extruder hopper. This closed-loop layout eliminates the manual handling, bin transport, and cross-contamination risk that occur when regrind is accumulated in a central recycling area and returned in bulk once per shift. Request a dimensioned factory layout drawing at quotation stage — our engineers model your specific building dimensions and output target to optimize placement before a single machine is shipped. For context on how layout impacts overall plant throughput, see our production line case studies.

11. What differentiates a profile extrusion line that produces consistently within ISO tolerance from one that requires constant operator adjustment?

The difference between a line that runs hands-off for an 8-hour shift and one that requires operator intervention every 30–60 minutes is the closed-loop control architecture of four interdependent parameters: (a) extruder melt pressure at the adapter — maintained within ±0.3 MPa by PID control of screw RPM, which compensates for slight variations in hopper feed density; open-loop screw RPM control cannot react to these variations, and the resulting melt pressure swings of ±1.5 MPa translate directly to profile dimensional variation. (b) Die zone temperatures — controlled by individual thermocouples in each die heating zone (minimum 4 zones for a profile die), with heater power modulated by solid-state relays at 0.1°C resolution; mechanical contactors with 2–3°C hysteresis bands create a sawtooth temperature profile that is the single largest cause of intermittent surface defects. (c) Calibration vacuum level — maintained within ±0.002 MPa by a vacuum regulator with a pneumatic bleed valve; a simple on/off vacuum pump cycles between –0.06 MPa and –0.02 MPa, under-drawing and over-drawing the profile in alternating 30-second cycles, visible as subtle thickness bands under oblique lighting. (d) Haul-off speed synchronization — digitally locked to extruder screw RPM via encoder feedback, not analog potentiometer control that drifts by 1–2% per hour as the potentiometer and drive electronics warm up. Specifying these four control features at purchase adds approximately 8–12% to the line cost but reduces operator intervention frequency by over 80%, which on a 3-shift operation saves approximately one operator salary per year in reduced labor and recovers 3–5% lost output from intermittent quality stops.

12. How do you validate that a newly commissioned profile line is producing to specification before releasing it for commercial production?

A proper commissioning validation protocol goes beyond checking that the machine powers on and the first meter of profile looks acceptable. Our recommended 3-phase validation: (Phase 1 — Mechanical commissioning, 4–6 hours) : Verify screw rotation at 10, 30, and 60 RPM with no material (confirm gearbox oil temperature, motor current draw, and vibration amplitude at each speed); pressure-test calibration table vacuum system at –0.06 MPa with all circuits closed (leak rate ≤0.005 MPa/10 min); confirm haul-off speed linearity at 0.5, 2.5, and 5.0 m/min using a handheld tachometer on the drive shaft. (Phase 2 — Process commissioning, 6–10 hours) : Run the target formulation at three line speeds (50%, 75%, 100% of rated) and log melt pressure, die temperature profile, motor current, and vacuum level continuously at 1 Hz; the stability criteria are — melt pressure variance ≤0.5 MPa, die zone temperature variance ≤1.5°C, motor current variance ≤3% at each speed. (Phase 3 — Product validation, 8–12 hours) : Run a full production shift (minimum 4 hours continuous) at the target line speed, sample 3 profiles every 30 minutes (total 24 samples), and measure width, thickness, weight-per-meter, and warp on each sample; the acceptance criteria are — width tolerance ±0.15 mm for profiles ≤200 mm, ±0.25 mm for 200–600 mm, ±0.40 mm for 600–1000 mm; weight-per-meter coefficient of variation ≤3% across all 24 samples; warp (measured as deviation from a straight edge over 1 meter) ≤1.0 mm/m. Until all three phases pass, the line is not released for commercial production. Our commissioning engineers stay on-site (remotely via video or in person) until the Phase 3 data package meets acceptance criteria — we do not consider a line "delivered" until it is producing specification-grade profile at the contractually agreed output rate. For teams planning to integrate the line with existing factory automation infrastructure, Phase 2 includes verification of the PLC communication protocol with your plant's SCADA or MES system.

Why Choose Chenxing Machinery

• Conical twin-screw expertise validated across six model sizes — the YF series shares a common screw geometry philosophy and downstream architecture, meaning the process knowledge you build on a YF240 transfers directly to a YF600 or YF1000. Spare screw pairs, barrel sections, and calibration sleeve blanks are cross-compatible within adjacent model pairs, reducing your spare-parts inventory cost.

• Die design is performed in-house with CFD-verified flow balancing — before your die is machined, the flow-channel geometry is simulated against your specific formulation's viscosity curve at 185°C. The die arrives with a simulation report showing predicted velocity distribution across the profile cross-section, and the actual first-run profile is measured against this prediction. Discrepancies above 5% trigger a free die rework.

• Calibration tooling is matched to your profile, not adapted from a generic library — the calibration sleeve internal geometry is machined to your exact profile drawing with 0.05 mm tolerance, including independent vacuum circuits for each internal chamber on hollow profiles. This is not an off-the-shelf part; it is a single-purpose tool fabricated for your production line.

• Remote commissioning with data-driven acceptance — every YF line ships with a pre-configured data logger that records melt pressure, die temperatures, motor current, vacuum level, and line speed at 1 Hz during commissioning. You receive the full dataset as a CSV file, and the line is not considered commissioned until the Phase 3 product validation data package meets the acceptance criteria specified in your contract.

Start Your PVC / WPC Profile Production Line Quotation

Ready to produce PVC ceiling panels, WPC decking, window frames, or door profiles with a single extrusion platform that switches between materials by changing the die — not the entire line?

Step 1 — Define Your Profile Portfolio: Email ceo@cxsljx.com with your target profile types (ceiling, decking, window frame, door frame, wall panel), maximum profile width (mm), desired annual tonnage, and whether you intend to run pure PVC, WPC, or both. Include profile cross-section drawings if available. Response within 24 hours.

Step 2 — Review Your Customized Line Configuration: Within 3 working days, receive an itemized quotation with model recommendation, die design feasibility assessment, calibration tooling specification, factory layout drawing, and projected output rate at your specified formulation. The quotation includes a clear line-item breakdown: extruder, die, calibration table, haul-off, cutter, stacker, and optional mixing unit.

Step 3 — Validate with a Production Trial: Before shipment, we produce a sample run of your target profile using your specified formulation (you supply the compound, or we source an equivalent). You receive a video of the full production run with logged process parameters and a sample shipment of the produced profiles for your own QC lab testing.

Step 4 — Commission with Data-Driven Acceptance: Our engineers guide your installation via real-time video, commission all six line sections, execute the 3-phase validation protocol, and deliver the data package proving your line produces specification-grade profile at the contracted output rate. Only then is the line released for commercial production.

Contact us now: ceo@cxsljx.com | +86 159 5118 7228 | Chenxing Machinery