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Product Description
The PVC wall panel, floor and door panel production line by Chenxing Machinery is a two-model series — SJSZ-65 and SJSZ-80 — engineered for high-volume production of PVC and bamboo-wood fiber composite panels spanning 200 mm to 1,000 mm in width at throughputs of 80–420 kg/hr. These panels are the dominant interior wall and floor surfacing material across Asia-Pacific, European, and North American construction markets, valued for their zero-formaldehyde installation, waterproof surface, and rapid on-site assembly that reduces interior finishing labor by 60–70% compared to traditional plaster-paint or tile workflows.
The line consists of a conical twin-screw extruder, profile die, vacuum calibration table, caterpillar haul-off, flying cutter, and automatic stacking rack — all governed by a centralized PLC with touchscreen HMI. By changing the die and calibration tooling, the same line produces wall panels, floor planks, ceiling panels, and door leaf boards in different widths, thicknesses (typically 5–12 mm), and surface textures (wood grain, marble, solid color, high gloss). The full Chenxing product catalog includes upstream mixing stations and downstream embossing units that can be integrated for a complete turnkey panel factory.
| Parameter | SJSZ-65 | SJSZ-80 |
|---|
| Output Capacity | 80–350 kg/hr | 150–420 kg/hr |
| Extruder Power | 37 kW | 55 kW |
| Panel Width Range | 200–600 mm | 400–1,000 mm |
| Machine Length | 21 m | 23 m |
| Drawing Speed | 0.5–5 m/min | 0.5–5 m/min |
| Extruder Type | Conical twin-screw | Conical twin-screw |
| Control System | PLC + touchscreen HMI | PLC + touchscreen HMI |
Model selection: SJSZ-65 is the entry-level workhorse for interior wall panels, ceiling boards, and narrow floor planks up to 600 mm — ideal for manufacturers targeting the residential renovation and contractor supply market. SJSZ-80 scales to 1,000 mm wide door leaf boards, wide-format wall cladding panels, and commercial flooring with the 55 kW drive and 420 kg/hr capacity to support multi-shift, high-volume production. Both models share the same conical twin-screw architecture — the SJSZ-80 simply extends the screw diameter and barrel length to increase plasticizing capacity by approximately 40%, while the downstream equipment is proportionally upsized for the wider panel format. For plants already running pipe or profile extrusion lines, the SJSZ series extruder is mechanically compatible with established spare-parts inventories and operator training protocols.
| No. | Component | SJSZ-65 | SJSZ-80 |
|---|
| 1 | Conical Twin-Screw Extruder | ● | ● |
| 2 | Panel Profile Die | ● | ● |
| 3 | Vacuum Calibration Table | ● | ● |
| 4 | Caterpillar Haul-Off Machine | ● | ● |
| 5 | Flying Cutter | ● | ● |
| 6 | Automatic Stacking Rack | ● | ● |
● = Standard configuration
The SJSZ conical twin-screw extruder is purpose-built for the high-filler, low-shear processing window that bamboo-wood fiber PVC panels demand. These formulations typically contain 30–60% calcium carbonate or wood/bamboo fiber filler by weight — far higher than the 5–15% typical of PVC pipe compounds. Processing this material without burning the cellulose fiber (degradation onset: 175°C) while fully plasticizing the PVC matrix (gelation: 185–195°C) requires precise temperature control across four barrel zones. The conical screw geometry delivers this by progressively compacting the low-bulk-density dry blend (0.35–0.50 g/cm³) through a naturally converging channel, building pressure gradually rather than at a single compression point — this avoids the shear spikes that cause localized fiber burning and surface discoloration on the finished panel.
The SJSZ-65's 37 kW drive provides sufficient torque for 80–350 kg/hr across the 200–600 mm width range. The SJSZ-80's 55 kW drive extends this to 420 kg/hr at 1,000 mm panel width — a throughput that fills approximately two 40-foot containers of finished wall panels per week on a continuous three-shift operation. Both extruders feature nitrided 38CrMoAlA screws (HV 900–1,000 surface hardness) and bimetallic barrel liners available as an option for operations processing above 50% mineral filler, where abrasive wear would otherwise require screw reconditioning at 6,000–8,000 hours.
The panel die is custom-machined to the target width, thickness, and edge profile (tongue-and-groove, shiplap, or square-edge), but the mounting flange and heating band interface are standardized. A complete die and calibration-tooling changeover between, for example, a 300 mm × 8 mm wall panel and a 600 mm × 10 mm floor plank, takes approximately 1.5–2 hours — enabling a single shift to run wall panels in the morning and floor planks in the afternoon, or to fulfill a mixed-product container order without dedicating separate lines to each SKU. The die land is chrome-plated with a surface finish of Ra ≤ 0.08 μm, producing a panel surface smooth enough to accept wood-grain embossing or high-gloss finishing directly off the extrusion line without secondary sanding.
The centralized PLC with touchscreen HMI stores up to 50 product recipes — each containing the complete parameter set for a specific panel SKU: barrel zone temperatures (4 zones), screw RPM, die zone temperatures (3 zones), calibration vacuum level, calibration water temperature, haul-off speed, cutter length, and stacking count. Switching from a 400 mm wall panel to a 600 mm floor plank takes approximately 30 seconds: the operator selects the recipe on the touchscreen, the PLC ramps all parameters to the new setpoints over a 3–5 minute transition window (preventing thermal shock to the barrel and die), and the first specification-grade panel of the new SKU emerges within 15–20 minutes of the changeover command. This recipe-based approach eliminates the operator skill barrier that limits smaller factories to producing one or two SKUs — with 50 stored recipes, a single line can service an entire product catalog of wall, floor, and ceiling panels. For manufacturers integrating material recycling systems, the PLC's regrind-recipe mode automatically adjusts screw RPM and barrel temperatures to compensate for the lower bulk density and higher moisture content of post-industrial regrind.
Wide panels present a unique calibration challenge: a 1,000 mm panel with a 2.5 mm wall thickness has an aspect ratio of 400:1, and any temperature differential across its width during cooling will create internal stress that manifests as longitudinal curvature or "oil-canning" (alternating concave/convex deformation). The vacuum calibration table addresses this with zoned cooling control — the calibration sleeve's water channels are divided into left, center, and right zones, each with its own thermostatic valve maintaining the cooling water within ±1.5°C across all three zones. The vacuum is applied through a slotted calibration plate that distributes negative pressure evenly across the panel width, preventing the center section from sagging under gravity before it solidifies. Calibration table length is matched to line speed to guarantee a minimum 45 seconds of active cooling — the point at which the panel core temperature drops below the PVC glass transition temperature (approximately 82°C) and the panel can support its own weight without deformation at the haul-off entry.
The caterpillar haul-off uses wide polyurethane contact pads (150–200 mm pad width) to distribute pulling force across the panel surface without leaving compression marks on the decorative face. Pneumatic clamping pressure is adjustable from 100–600 N depending on panel thickness and formulation — too little pressure and the panel slips, creating thickness bands; too much and the soft PVC surface (still at 40–50°C at the haul-off entry) takes a permanent imprint from the pad texture. Haul-off speed is digitally synchronized to extruder screw RPM via encoder feedback, maintaining ±0.3% speed accuracy throughout an 8-hour shift. The flying cutter's saw blade is selected for panel material: a carbide-tipped blade (80-tooth, 350 mm diameter) at 3,000–4,000 RPM for rigid PVC panels; a diamond-tipped blade at 2,500–3,000 RPM for high-filler bamboo-fiber panels where abrasive filler content accelerates carbide wear. Cut length accuracy: ±1 mm at any line speed.
Dry Blend Preparation — PVC resin (K-value 65–68) is mixed with CaCO₃ filler (30–60%), bamboo/wood fiber (optional, 10–20%), stabilizers, lubricants, foaming agents (for foamed-core panels), and color masterbatch in a hot-cool mixer at 110–120°C / 40–45°C.
Conical Twin-Screw Plasticizing — The dry blend enters via gravimetric feeder into the extruder hopper. Four barrel zones bring the material to 185–195°C melt temperature at the die entry. Screw RPM is PID-controlled to maintain melt pressure at the adapter within ±0.5 MPa.
Die Forming — The homogenized melt passes through a coat-hanger or T-die geometry (width-dependent design) that distributes the melt evenly across the panel width. Die exit gap is adjustable via a flexible lip with differential bolts at 50 mm spacing for fine-tuning thickness uniformity.
Vacuum Calibration & Cooling — The hot panel enters the calibration table within 10–15 mm of the die exit. Zoned vacuum and cooling water circuits solidify the panel progressively from skin to core, with exit temperature ≤45°C.
Surface Embossing (Optional Inline) — An embossing roller pair immediately after the haul-off impresses wood-grain, marble, or brushed-metal texture onto the panel surface while the PVC is still at 35–45°C — soft enough to take the pattern, rigid enough to retain it after cooling.
Cutting & Stacking — The flying cutter trims to programmed length. Automatic stacking rack collects cut panels in counted bundles, with an optional protective film applicator that lays PE film between each panel to prevent surface scuffing during transport. For export-oriented production, in-line batch coding prints production date, shift, and SKU on the panel edge or back face.
| Panel Type | Typical Width (mm) | Typical Thickness (mm) | Core Structure | Primary Market |
|---|
| Interior Wall Panel | 200–600 | 5–9 | Hollow / Foamed | Residential, hospitality, healthcare |
| Floor Plank | 150–400 | 6–12 | Solid / Foamed core | Residential, commercial flooring |
| Door Leaf Board | 400–1,000 | 8–15 | Solid / Hollow-chamber | Interior door manufacturing |
| Ceiling Panel | 200–400 | 5–8 | Hollow | Residential, office, retail |
| Decorative Cladding | 200–600 | 5–10 | Foamed | Hotel lobbies, retail, exhibition |
| Cabinet Back Panel | 300–600 | 3–5 | Solid | Furniture, kitchen cabinetry |
The conical twin-screw's progressively decreasing channel cross-section compacts the low-bulk-density dry blend gradually along the entire screw length, avoiding the single-point compression that creates shear spikes and localized 200°C+ hot spots in parallel-screw designs. Four PID-controlled barrel zones (typically 155°C → 165°C → 175°C → 182°C for bamboo-fiber formulations) keep the melt below the 185°C threshold where cellulose begins thermal degradation and visible browning. For formulations exceeding 50% filler, the optional bimetallic barrel liner (HRC 58–62) extends screw reconditioning intervals from 6,000 to 12,000+ hours by resisting the abrasive silica present in natural bamboo fiber at 0.2–0.4% by weight. The gravimetric feeder at the hopper ensures filler-to-resin ratio stays within ±0.5% across an 8-hour shift, eliminating the formulation drift that is the most common root cause of intermittent burn-spot defects.
Daily output for any panel profile = (panel width in meters) × (panel thickness in meters) × (drawing speed in m/min) × (PVC compound density in kg/m³) × (operating minutes per day). The bottleneck is almost never the extruder — it is the cooling capacity of the calibration table relative to the panel's thermal mass. A 1,000 mm × 3 mm thin wall panel carries approximately 1.5 kg of PVC per linear meter and can be cooled through its full thickness in 30–40 seconds, supporting a line speed of 4–5 m/min. A 600 mm × 10 mm solid floor plank carries approximately 3.0 kg/m and requires 90–120 seconds, limiting line speed to 2–2.5 m/min. This 2:1 speed ratio translates directly to a 2:1 daily output ratio between two factories running the same SJSZ-80. The path to higher output is not a larger extruder — it is a longer calibration table (6–8 meters instead of the standard 4 meters) that provides sufficient residence time at higher line speeds. Our application engineers calculate the minimum calibration length for your specific panel cross-section and target output as part of the line configuration proposal.
Warpage in panels wider than 400 mm is driven by a single root cause: temperature differential across the panel width during the solidification phase. When the center of a 1,000 mm panel exits the die at 190°C and the edges have already cooled to 140°C after traveling 200 mm through ambient air, the edges solidify first and lock in their dimensions, while while the center continues to shrink as it cools over the next 30–40 seconds — creating a concave curvature toward the hotter face. The countermeasure is a three-zone calibration sleeve: left, center, and right water circuits controlled by independent thermostatic valves. The edge zones receive cooling water at 15–17°C, the center zone at 13–15°C, equalizing the panel's exit temperature across its full width to within ±3°C by the end of the calibration table. The vacuum slot pattern is also zoned — wider slots at the edges to pull the fast-cooling edges firmly against the calibration surface, narrower slots at the center to prevent over-drawing the still-soft center section. This setup reduces warpage rates from 12–18% (single-zone calibration) to under 3% on 1,000 mm panels, verified by measuring 10 consecutive panels against a granite surface plate during commissioning.
Decorative panel surface defects map to three independent process zones: (a) Die exit — die lines, flow marks, and shark-skin: Caused by insufficient die land polishing (target Ra ≤ 0.08 μm), die lip contamination (PVC degradation residue), or melt temperature below 185°C at the die entry. The diagnostic sequence: first clean the die lip with a brass scraper; if defect persists, increase die zone 3 temperature by 3°C; if still present, pull the die and polish the land with 800-grit diamond paste. (b) Calibration zone — drag marks, chatter, and gloss variation: Caused by insufficient water lubrication between the panel surface and calibration sleeve, or by the sleeve's internal surface roughness exceeding Ra 0.2 μm. The fix is to increase calibration water flow rate by 15–20% (measured at the sleeve inlet, not the pump outlet) and verify sleeve surface finish with a portable roughness tester. (c) Embossing zone — shallow pattern, inconsistent depth: Caused by the panel entering the embossing roller at a temperature below 35°C (PVC too rigid to accept the pattern) or above 50°C (PVC too soft and springs back after embossing). The fix is to adjust the distance between the calibration table exit and embosser, and to add an infrared preheater between the two if the distance exceeds 1.5 meters.
The PLC recipe system stores every production parameter — 4 barrel zone temperatures, 3 die zone temperatures, screw RPM, melt pressure setpoint, calibration vacuum level, calibration water temperature (3 zones), haul-off speed, cutter length, and stacking count — as a named recipe file. When a new shift operator arrives, they select the SKU name from a dropdown menu, and the PLC ramps all 20+ parameters to the saved setpoints over a 3–5 minute transition window using PID ramp-rate limiting that prevents thermal overshoot. The operator's only manual task is verifying the first panel's width (±0.3 mm), thickness (±0.15 mm), and surface finish against a reference sample — a 90-second process. Before recipe-based control, shift changes typically caused a 20–30 minute quality transition window while the new operator manually dialed in each parameter from memory or a handwritten logbook. Recipe control eliminates this: the first panel produced by the night-shift operator is identical to the last panel produced by the day-shift operator because both are produced from the same electronic parameter file. For factories running multiple SKUs across three shifts, recipe control is the single highest-ROI automation investment on the extrusion line — it costs no additional hardware (the PLC and HMI are standard) and recovers 3–5% of daily output that would otherwise be lost to shift-change transition scrap.
The optimal layout is a straight line: (a) Raw material zone — 4 m × 6 m area directly behind the extruder, with the hot-cool mixer within 3 meters of the hopper and the gravimetric feeder mounted on load cells for in-situ weight verification. (b) Extrusion spine — the 21–23 meter extruder-to-stacker line with 1.5-meter walkways on both sides; the calibration table positioned to allow the operator to access all three cooling-zone valves without stepping over the moving panel. (c) Post-extrusion processing — inline embosser, protective film applicator, and flying cutter in sequence within 3 meters of the haul-off exit, minimizing the distance the still-warm panel travels unsupported. (d) Stacking & QC — the automatic stacking rack within 2 meters of the cutter, feeding directly into a QC inspection table (granite surface plate with dial indicator stand for warp and dimensional checks). (e) Packaging & dispatch — pallet wrapping station within 5 meters of the QC table, with a forklift aisle of 3.5 meters behind the stacker for pallet removal without crossing the operator walkway. Total floor area: approximately 23 m × 8 m (184 m²) for the SJSZ-80 line, excluding raw material warehouse. For plants producing foamed-core panels, the layout includes a separate chemical foaming agent dosing station positioned 2 meters from the mixer with explosion-proof electricals per ATEX Zone 22 requirements. Our engineering team generates a dimensioned CAD layout drawing specific to your factory dimensions as part of the quotation package — not a generic illustration, but a floor plan showing exact machine positions, utility connection points, material flow paths, and operator stations.
Formulation-optimized screw geometry — the SJSZ conical screw's compression ratio, L/D ratio, and flight depth profile are factory-configured to your target filler content (30–60%), not a generic one-size-fits-all design. A screw optimized for 30% filler will over-shear a 60% filler formulation and burn the cellulose; we match the screw to your formulation before machining.
Recipe-controlled repeatability — 50-recipe PLC with PID ramp-rate limiting eliminates shift-change quality variation and enables one-operator production across an entire wall/floor/ceiling panel product catalog.
Quick die change validated in the field — 1.5–2 hour complete SKU changeover, supported by standardized die flange and calibration-tooling quick-connect fittings, means mixed-product container orders are filled from one line.
Calibration table sized to your throughput target — we do not ship a default 4-meter table and hope it works. Our application engineers calculate the minimum calibration length for your panel cross-section and target m/min, and the quotation specifies a table length that achieves both throughput and flatness targets.
Ready to launch or expand your PVC / bamboo-fiber wall panel, floor plank, or door board production — all from a single extrusion platform?
Step 1 — Define Your Panel Portfolio: Email ceo@cxsljx.com with your target panel types, widths, thicknesses, filler content (%), desired daily output (kg or m² per shift), and factory dimensions. Include a cross-section drawing of your most complex panel profile if available. Response within 24 hours.
Step 2 — Receive Your Configured Proposal: Within 3 working days, receive a model recommendation (SJSZ-65 or SJSZ-80), die design assessment for your widest panel, calibration table sizing with throughput projection, dimensioned factory layout drawing, and itemized quotation.
Step 3 — Validate with a Production Sample: Before shipment, we run a sample production of your target panel cross-section using your specified formulation. You receive a process parameter data log, panel samples for your QC lab, and a video documenting the full production run.
Step 4 — Commission to Specification: Our engineers guide your installation and commissioning via real-time video, including recipe setup for all SKUs, calibration tuning for each panel width, and operator training on recipe management and QC procedures. The line is released for commercial production only after your widest and thickest panel profiles meet dimensional and surface quality specifications at the contracted output rate.
Contact us now: ceo@cxsljx.com | +86 159 5118 7228 | Chenxing Machinery
