SJSZ65/132 Conical Twin Screw Extruder for PVC Sheet

Key Features of the SJSZ65/132 Conical Twin Screw Extruder

Purpose-Built for PVC Sheet Formulation

• Conical twin screw geometry optimized for PVC powder (dry blend) with CaCO3 and impact modifiers.
• Enhanced shear and mixing zones ensure uniform gelation, low fish-eye, and consistent melt homogeneity.
• Wide processing window accommodates recycled PVC content while maintaining gloss and mechanical strength.

High Output, Stable Plasticizing

• Balanced screw profile and precise barrel temperature control deliver steady melt pressure and low fluctuation.
• Large torque gearbox with hardened gears enables continuous duty and high throughput under load.
• Melt temperature stability improves sheet thickness tolerance and reduces downstream adjustments.

Materials, Build Quality, and Cooling

• Nitrided/bi-metallic barrel and wear-resistant screw alloy for long life with filled PVC compounds.
• Multi-zone barrel heating with air or water-assisted cooling guarantees accurate thermal profile.
• Efficient degassing and vacuum venting minimize moisture/volatiles for bubble-free sheet surfaces.

Process Integration and Quick Changeover

• Gravimetric or volumetric feeder integrates with high-torque main drive for precise output control.
• T-die and three-roll calender compatibility for smooth, matt, or embossed PVC sheet finishes.
• Fast recipe switching, quick-screen changer, and inline thickness gauge reduce downtime and scrap.

Applications and Industries

Building and Construction

• Rigid PVC wall/ceiling panels, decorative sheets, door panels, SPC substrate layers, and protective boards.
• Electrical trunking covers, window sill boards, and interior cladding with fire-retardant formulations.

Furniture and Interior

• Cabinet backing boards, decorative furniture panels, WPC/PVC composite skins, and lamination substrates.

Automotive and Transportation

• Interior trim substrates, trunk liners, and lightweight protective sheets for packing and assembly aids.

Advertising and Packaging

• PVC display boards, sign sheets, printing substrates with high surface energy for excellent ink adhesion.

Technical Specifications

Performance and Capacity

• Output capacity: typically 220–380 kg/h for rigid PVC sheet depending on formulation and target thickness.
• Sheet thickness range: approx. 0.6–8.0 mm with appropriate die and calender configuration.
• Melt pressure and temperature stability enable tight thickness tolerance and low surface waviness.

Mechanical Configuration

• Model: SJSZ65/132 conical twin screw with high-torque gearbox and forced lubrication.
• Barrel heating: multi-zone electric heaters; closed-loop PID temperature control.
• Vacuum venting with condenser; automatic screen changer; corrosion-resistant melt pathway.
• Compatible downstream: hanger-type T-die, three-roll calender (vertical or inclined), edge-trim, haul-off, cutter, stacker.

Controls and Automation

• PLC + HMI touchscreen with recipe management, alarm history, trend curves for pressure/amperage/temperature.
• Closed-loop thickness control (optional) via online gauge; line synchronization for stable haul-off speed.
• Safety interlocks: motor overload, barrel overheat, vacuum loss, roll gap limit, and emergency stops.

Energy and Utilities

• Installed power: main motor 55–90 kW depending on configuration and output targets.
• Optimized specific energy via VFD main drive, zoned heating, and intelligent cooling control.
• Air and water requirements sized for stable calender roll temperature and die lip cooling.

Note: Parameters may vary by material formulation, filler content, sheet width, and target thickness. Customized configurations available on request.

Customer Case

User Recognition and Market Performance

Customer Feedback

• Consistent feedback on excellent thickness uniformity and gloss, reducing post-processing defects and claims.
• Reported 8–15% lower specific energy consumption versus legacy lines due to optimized screw/cooling design.
• Maintenance teams highlight easy access to screens, die lips, and roll gaps for rapid grade/color changes.

Representative Case Studies

• Building panel producer: increased recycled PVC ratio by 20% while maintaining Class B1 fire rating and smooth finish.
• Furniture board manufacturer: cut thickness deviation by 30% with online thickness control and recipe tuning.
• Sign sheet converter: improved ink adhesion and print quality; scrap rate reduced by 18% after line upgrade.

Market Competitiveness

• Strong ROI through higher OEE, reduced scrap, and lower kWh per ton; scalable to multi-layer co-extrusion.
• Robust wear package supports mineral-filled formulations, extending service intervals and lowering TCO.