PVC Pelletizing Line Case Study

SJZ65/132 Conical Twin-Screw with Hot-Face Pelletizing

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Discover how a PVC pelletizing machine built around the SJZ65/132 conical twin-screw extruder delivers stable, high-output PVC granules for pipes, cable compounds, profiles, and recycled PVC. This turnkey PVC granulator package integrates a high-speed mixer, spiral loader, water-ring/hot-face pelletizer, multi-stage pneumatic conveying, cyclone separation, and vibrating screen — engineered for energy efficiency, consistent pellet size, and low maintenance.

PVC Pelletizing Line Overview

Turnkey PVC Pelletizing Equipment Optimized for Rigid & Flexible PVC

• Complete PVC compounding and granulation line: feeding, mixing, extrusion, hot-face pelletizing, drying, conveying, separation, and screening.
• Stable throughput of 230–260 kg/h per SJZ65/132 line, ideal for pipe-grade PVC pellets, cable compound pellets, and recycled PVC granules.

Built for Consistency, Safety, and Uptime

• PLC/HMI control with precise temperature zones and frequency control on main drives.
• Wear-resistant metallurgy (38CrMoAlA nitrided barrel/screws, bimetallic options) supports long service life and high-quality pellets.

PVC Pelletizing Line Configuration and Key Features

Feeding & Material Handling

Spiral Loader (3 units)

• Rated loading capacity: 1000 kg/h per loader; hopper volume: 150 kg.
• 114 mm feed tube, 2.2 kW 6-pole motor for stable resin and additive feeding.
• Optimized for PVC resin, stabilizers, plasticizers, and CaCO3 fillers.

High-Speed Mixing and Cooling

SRL-Z500/1000 High-Speed Mixer Set

• Total volume: 500 L (hot) + 1000 L (cool); effective volumes: 350 L (hot) + 750 L (cool).
• Hot mixer: 0–1400 rpm, 75 kW motor with Yaskawa VFD; self-friction heating for fast gelation and uniform dispersion.
• Cool mixer: 60 rpm, 15 kW motor for rapid temperature pull-down, protecting PVC from thermal degradation.
• Construction: 304 stainless steel pots (8 mm wall, 10 mm bottom); cast stainless impellers (ZG1Cr18Ni9Ti); dual-seal pneumatic lids.
• Output: 800–1200 kg/h depending on formulation and cycle time.
• Electricals: Dongqi temperature controllers, Siemens contactors, Schneider pushbuttons for robust reliability.

Extrusion & Melt Stabilization

SJZ65/132 Conical Twin-Screw Extruder (2 sets)

• Materials: 38CrMoAlA nitrided barrels/screws with hard chrome plating; nitriding depth 0.5–0.7 mm; surface hardness 800–900 HV.
• Screw diameter: Φ65/132 mm; effective length: 1430 mm; speed: 1–35 rpm for gentle PVC processing.
• Drives: 37 kW Siemens(Beide) main motor with Yaskawa VFD; 1.1 kW forced feeder with Yaskawa VFD for steady intake.
• Heating/Cooling: Cast-aluminum heaters with 250 W cooling fans per zone; total barrel heating power 24 kW.
• Throughput: 230–260 kg/h (approx. 4–6.2 tons/24 h), depending on recipe and pelletizing method.
• Gearbox: Heavy-duty reducer from Jiangyin main factory; water-cooling interfaces on barrel ensure thermal stability.
• Controls: Tight temperature control (±1°C) with Dongqi controllers; Siemens contactors; Schneider pushbuttons; Qiansheng digital indicators.

Pelletizing & Downstream

PVC Hot-Face Pelletizing Die

• Die steel: ZG40Cr for strength and thermal stability.
• Cutting: Hot-face pelletizing with 2 blades (Cr12 tool steel) driven by a 2.2 kW motor; Yaskawa VFD for precise cutter speed.
• Safety: Stainless-steel guard around cutting area.

Pneumatic Conveying & Drying

• Three-stage air conveying with 3 × 3 kW blowers; 1.5 kW drying blower for moisture removal and pellet surface drying.
• Stainless-steel air pipes (201 SS) and cyclone separation bins for dust control and efficient transfer.

Cyclone Separation & Storage

• Cyclone bins constructed from 2 mm 201 stainless steel; capacity: 500 kg per bin.
• Manual slide-gate discharge valves for controlled unloading.

Vibrating Screen

• Length: 2.5 m; dual 0.2 kW vibration motors.
• Effective screening area: 500; removes fines/overs to ensure uniform pellet size for extrusion or injection applications.

Performance and Energy Efficiency

Stable Output with Low Specific Energy

• Typical specific energy: 0.18–0.28 kWh/kg for standard PVC formulations.
• Vector-controlled drives (Yaskawa) maintain torque at low screw speeds, reducing melt oscillation and improving pellet uniformity.

Durability and Maintenance

• Nitrided, hard-chrome surfaces resist abrasion from filled PVC compounds (e.g., CaCO3).
• Modular design allows fast blade changes, easy screen maintenance, and straightforward access to heaters and fans.

Applications of PVC Pelletizing Line

Building & Construction

• Pipe and fittings, cable conduits, window profiles, siding, wall panels, waterproof membranes.

Electrical & Cable Compounds

• Insulation and sheathing compounds; halogenated/heat-stabilized PVC pellets for wire and cable.

Furniture & Home

• Edge banding, floor skirting, decorative profile substrates, appliance components.

Automotive & Industrial

• Interior trim components, seals and gaskets, protective sleeves, flexible hose compounds.

Recycling & Circular Economy

• PVC recycling granulation for reprocessing scrap into stable, reusable pellets.

Quality Control and Safety

Intelligent Control & Traceability

• Recipe management via VFD/temperature profiles; tight zone control ensures consistent gelation and thermal history.
• Optional gravimetric feeding and melt monitoring can be integrated for premium grade pellets.

Compliance & Safeguards

• Emergency stops, guarding on cutting head, interlocks on mixer lids, and proper dust control via cyclone and air conveying.
• Closed-loop water-cooling compatibility helps minimize water usage and environmental impact.

Commercial Terms & Support

Delivery, Testing, and Acceptance

• Factory pre-acceptance at supplier site before shipment: layout, configuration, parameter verification, function tests, and programming checks.
• Final on-site acceptance at buyer’s factory within one week of installation, including 4-hour continuous trial run and performance verification.

Warranty and After-Sales

• 1-year warranty from final acceptance (heaters 6 months).
• 4-hour response time and 48-hour on-site service during and after warranty; lifetime paid service with spare parts at ex-factory price.

Logistics and Pricing (Reference from Contract)

• Turnkey package included mixers, loaders, extruders, pelletizer, air conveying, cyclone bins, vibrating screen.
• Quoted total: 408,000 RMB (incl. 13% VAT, freight, installation & commissioning) — for reference; customized offers may vary by market and options.

Why Choose This PVC Pelletizing Machine?

Market-Proven ROI and Reliability

• Conical twin-screw technology excels at low-temperature processing of PVC, reducing thermal degradation, gel formation, and yellowing.
• Balanced line design (mixing → extrusion → hot-face pelletizing → pneumatic conveying → screening) ensures pellet quality and high uptime.

Competitive Advantages

• Energy-efficient drives and robust metallurgy extend service life and cut operating costs.
• Flexible configuration supports rigid PVC, flexible PVC, CPVC (with appropriate upgrades), and filled compounds.