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A twin screw extruder is the heart of most PVC processing lines, but many buyers ask the same question before investing: which production lines can it actually serve? The Chenxing SJSZ series conical twin screw extruder answers this directly. With six models from SJSZ-45 to SJSZ-92 covering outputs from 60–120 kg/h up to 600–800 kg/h, the SJSZ series feeds PVC powder directly without pelletizing, thanks to its counter-rotating conical screw geometry and gentle shear. Equipped with different dies and auxiliary machines, it produces PVC pipes, window and door profiles, sheets, boards, pellets, wood-plastic composites, hoses and specialty profiles. This guide explains the production lines a twin screw extruder can serve and how Chenxing solves the real pain points of PVC processors.
Buying an extruder is rarely a quick purchase. Research shows that 94% of B2B customers conduct online research before purchasing, 62% of engineers complete at least half of the buying process online, and 78% of manufacturing buyers report longer purchasing cycles with decisions passing through committees (over 53% of teams now include 8+ members). For PVC processors, the extruder is the most strategic machine on the floor: it determines product quality, output capacity, energy consumption and maintenance cost for years.
The challenge is that not every twin screw extruder is suitable for every line. Parallel twin screw machines, for example, excel at compounding and pelletizing, while conical twin screw extruders are preferred for direct PVC powder processing and profile/pipe extrusion. Understanding which production lines a twin screw extruder can serve — and which model fits your output target — is the first step to a profitable PVC processing investment.
The Chenxing SJSZ conical twin screw extruder series is a dedicated PVC twin screw extruder family designed for direct PVC powder extrusion. The conical screws rotate in opposite directions and outward, creating a larger intake volume at the feed end and a stronger compression ratio toward the discharge end — ideal for PVC's thermal sensitivity:
| Model | Screw diameter (mm) | Effective screw length (mm) | Motor power (kW) | Output (kg/h) | Speed (rpm) | Barrel heating power (kW) |
|---|---|---|---|---|---|---|
| SJSZ-45 | 45/90 | 985 | 15 | 60–120 | 1–45 | 12 |
| SJSZ-51 | 51/105 | 1070 | 18.5 | 80–150 | 1–45 | 18 |
| SJSZ-55 | 55/100 | 1270 | 22–30 | 100–180 | 1–45 | 18 |
| SJSZ-65 | 65/132 | 1430 | 37 | 200–300 | 1–34.7 | 24 |
| SJSZ-80 | 80/156 | 1800 | 55 | 300–400 | 1–34.7 | 36 |
| SJSZ-92 | 92/188 | 2500 | 110 | 600–800 | 1–34.7 | 86.8 |
Key characteristics of the SJSZ series:
Counter-rotating, outward-turning conical screws — gentle shear that reduces PVC thermal degradation, yellowing and additive breakdown.
Direct PVC powder processing — no pre-pelletizing required, saving energy, floor space and labor cost.
Six models from 60 to 800 kg/h — matched to pipe, profile, sheet, board, pelletizing, WPC, hose and specialty profile lines.
PLC control and imported electrical components — stable temperature control and repeatable process parameters.
Line-customized configuration — different dies and auxiliary machines convert one extruder platform into multiple product lines.
The SJSZ series is not a one-product machine. With different dies and downstream auxiliary machines, it powers a full range of PVC product lines:
PVC pipes are the largest application for conical twin screw extruders. The extruder plasticizes the PVC dry blend and feeds it continuously through the pipe die, followed by vacuum sizing, cooling and haul-off. The SJSZ-65 and SJSZ-80 models, with 200–400 kg/h output, are the workhorses for standard PVC pipe production lines, while the SJSZ-92 handles large-diameter pressure pipes at 600–800 kg/h. For processors targeting drainage, water supply or cable conduit, matching the extruder output to the pipe diameter and wall thickness is the first selection rule.
Window and door profiles demand precise dimensional stability and excellent surface quality. The gentle shear of the counter-rotating conical screws keeps the PVC compound stable, while PLC control maintains melt temperature within tight limits. The SJSZ-55 and SJSZ-65 models are commonly matched with PVC window profile lines and PVC profile production lines. Because profile dies are complex and changeover is costly, selecting an extruder with stable output and temperature control directly affects scrap rates and line uptime.
Sheet and board processing requires higher melt output and uniform gauge across the die width. The SJSZ-65, SJSZ-80 and SJSZ-92 models provide the output needed for PVC sheet production lines, PVC board production lines and general sheet extrusion lines. Applications include ceiling panels, wall panels, packaging sheets and foamed boards. For processors running PVC ceiling and wall panels, the extruder's output stability determines the panel surface finish and thickness consistency.
Not every processor extrudes directly. Many compounders produce PVC pellets or masterbatches for downstream customers. The SJSZ series can feed a strand or hot-die-face pelletizing system to create PVC pelletizing lines and plastic pelletizing lines, while higher-shear requirements can be met by TSE twin screw extruders or parallel twin screw extruders in a PVC compounding line. If your business model is pellet supply rather than direct profile extrusion, tell the supplier — the screw and die configuration will be designed accordingly.
WPC products combine PVC or PE with wood flour, requiring excellent dispersion and controlled shear to avoid degrading the wood filler. Conical twin screw extruders are widely used in wood-plastic composite production lines and WPC profile production lines for decking, fencing and cladding. The SJSZ-65 and SJSZ-80 offer the torque and output to handle high-filler compounds while maintaining stable melt flow.
Smaller SJSZ models are ideal for flexible PVC hoses and specialty profiles. The SJSZ-45 and SJSZ-51, with outputs of 60–150 kg/h, are compact enough for PVC hose making machines and low-volume profile extrusion lines. They also suit PVC door panel production lines and small sheet applications where space and energy efficiency matter more than maximum throughput.
The SJSZ series was designed around the real problems PVC processors face. Here is how Chenxing answers each pain point:
| Pain point | Chenxing SJSZ solution | Company advantage |
|---|---|---|
| Poor mixing uniformity causes unstable product properties | Counter-rotating conical screws provide strong positive conveying and homogeneous plasticizing of PVC powder | Proven conical twin screw design refined over decades of PVC processing experience |
| Low output cannot meet order volume | Six models from 60–120 to 600–800 kg/h cover shop-floor expansion step by step | Complete SJSZ range, one supplier for every capacity tier |
| PVC is heat-sensitive, prone to degradation and yellowing | Conical screws rotate outward with gentle shear, reducing frictional heat spikes; precise PLC temperature control | Machine design and control tuned specifically for PVC's thermal limits |
| Screw and barrel wear causes high maintenance cost | Stable process conditions reduce wear; line-customized configuration avoids over-stressing the machine | Wear-conscious engineering and responsive technical support |
| Unsure whether to process PVC powder directly or pelletize first | SJSZ feeds PVC powder directly into pipe, profile and sheet dies — no pre-pelletizing required | Direct-extrusion expertise lowers CAPEX, energy and labor cost |
| Confused about upgrading from single screw to twin screw | Conical twin screw offers positive displacement conveying, better plastification and higher output for PVC dry blends | Application engineers match the machine to your product and output target |
| High energy consumption and long downtime | PLC automation, imported electrical components and matched motor power reduce energy waste and stoppages | Energy-efficient configurations and after-sales service support |
| Slow after-sales response blocks production | Documented configurations, spare parts availability and engineering support from one responsible supplier | Direct factory support for installation, commissioning and training |
Before requesting a quote, verify these points so the twin screw extruder you buy fits your production plan:
| Checkpoint | What to verify | Why it matters |
|---|---|---|
| Product type | Pipe, profile, sheet, board, pellet, WPC, hose or specialty profile | Determines screw configuration and die selection |
| Output target | Required kg/h vs. the 60–800 kg/h SJSZ range | Avoids oversizing or undersizing your line |
| Material feed | PVC powder direct extrusion vs. pre-compounded pellets | Conical twin screw suits direct powder processing |
| Temperature control | Barrel heating power and PLC control accuracy | Protects heat-sensitive PVC from degradation |
| Downstream line | Die, sizing, cooling, haul-off and auxiliary equipment | Ensures a complete twin screw extrusion line, not just an extruder |
| After-sales | Installation, training, spares and technical support | Minimizes downtime after commissioning |
A conical twin screw extruder can produce a wide range of PVC products by changing the die and downstream equipment: pipes (drainage, water supply, cable conduit), window and door profiles, sheets, boards, ceiling and wall panels, pellets and compounds, wood-plastic composite profiles, hoses and various specialty profiles. The Chenxing SJSZ series covers outputs from 60–120 kg/h to 600–800 kg/h, so the same extruder platform can be configured for different product lines. This flexibility is why PVC processors treat the extruder as the core investment that defines which product families their factory can serve.
A single screw extruder relies on drag flow and friction for conveying, which is less effective with PVC dry-blend powder and requires more energy for uniform plastification. A conical twin screw extruder uses two counter-rotating, outward-turning screws with positive displacement conveying: the larger-diameter intake compresses the PVC powder efficiently, and the tapered profile provides strong plastification with lower shear. For PVC pipe, profile, sheet and board production from powder, the conical twin screw is the industry-standard choice, while single screw machines are more common for pellet feed and general-purpose thermoplastics.
Yes. This is one of the main advantages of the conical twin screw design. The SJSZ series feeds PVC dry-blend powder directly into the die to produce pipes, profiles, sheets and boards, eliminating the separate pelletizing step. Direct powder extrusion saves energy, reduces floor space, lowers labor cost and avoids the extra thermal history that pelletizing adds to heat-sensitive PVC. For processors comparing options, direct extrusion also shortens the time from raw material to finished product, which is why the SJSZ series is specified for PVC powder processing across the industry.
Match the model to your target output and product type. For hoses, specialty profiles and small sheet lines, the SJSZ-45 (60–120 kg/h) and SJSZ-51 (80–150 kg/h) are economical choices. For standard pipe and profile lines, the SJSZ-55 (100–180 kg/h) and SJSZ-65 (200–300 kg/h) cover most medium-scale production. For board, sheet and high-output pipe, the SJSZ-80 (300–400 kg/h) and SJSZ-92 (600–800 kg/h) provide the required throughput. Tell the supplier your product, die width or diameter, wall thickness and annual volume target, and the application engineer will recommend the optimal model and line configuration.
PVC degrades when it experiences excessive shear heat and long residence time, causing yellowing and property loss. The SJSZ series reduces this risk in three ways: the counter-rotating outward conical screws generate gentle, controlled shear instead of high-friction hotspots; PLC temperature control keeps the barrel heating power (12–86.8 kW depending on model) precisely matched to the process; and the positive conveying design minimizes material hold-up and over-processing. The result is stable melt quality, consistent product color and lower scrap rates — the essential requirements for processing heat-sensitive PVC formulations.
Contact the Chenxing sales and engineering team with: your target product (pipe, profile, sheet, board, pellet, WPC, hose), output requirement in kg/h, die size or product dimensions, PVC formulation type (rigid or flexible, filled or unfilled), and your plant layout. Our engineers will recommend the SJSZ model, the downstream twin screw extrusion line components, the customized configuration, price, lead time and after-sales service plan. This consultation is the fastest way to confirm which twin screw extruder matches your production goals.
A twin screw extruder is the machine that defines your factory's product range, output capacity and long-term profitability. The Chenxing SJSZ series answers the core question — which production lines can a twin screw extruder serve — with a single flexible platform: PVC pipes, window and door profiles, sheets, boards, pellets, WPC, hoses and specialty profiles, from 60 to 800 kg/h, with direct PVC powder feeding, gentle counter-rotating shear, PLC control and line-customized configuration. If you are upgrading from single screw, expanding capacity, or entering PVC processing for the first time, start with the SJSZ series and let our engineers configure the line around your product.
Request a quotation for your SJSZ conical twin screw extruder — tell us your target PVC product, output requirement and die configuration, and our plastics processing engineers will recommend the right model, line components and customization plan.
