Dual-outlet pipe extrusion lines have become a staple in PVC and CPVC pipe manufacturing, offering higher output and improved production flexibility. However, running two parallel streams simultaneously poses unique challenges to the screw and barrel system, especially when using conical twin-screw extruders.

This article explains why a well-engineered conical twin-screw design is critical for stable pressure distribution, melt consistency, and energy efficiency in dual-outlet pipe extrusion.

🔍 Why Dual-Outlet Extrusion Needs Specialized Screw Design

Dual-outlet extrusion splits the molten polymer flow into two separate channels, effectively doubling throughput without doubling the machine footprint. However:

• Pressure balance between outlets is crucial to avoid uneven pipe wall thickness
• Consistent melt temperature and viscosity must be maintained in both streams
• Higher torque requirements due to increased material volume
• Increased wear from higher throughput and abrasive fillers

A poorly designed screw can lead to product defects, frequent downtime, and higher energy consumption.

⚙️ How Conical Twin-Screw Design Addresses These Challenges

1. Balanced Compression Profile
The conical screw’s tapered geometry allows gradual compression and melting, ensuring uniform pressure across both outlets. This reduces pressure fluctuations that cause thickness variations.

2. Enhanced Torque Transfer
Conical screws generate higher torque at lower RPMs, reducing shear-induced heat and mechanical wear—vital for the increased load of dual extrusion.

3. Optimized Flight and Channel Design
Customized flight pitch and depth maintain consistent material flow, minimizing stagnation zones that could lead to degradation or contamination.

4. Wear-Resistant Materials
High filler content pipes demand bimetallic barrel liners and hard-faced screw flights to resist abrasion and extend service life.

🌍 Industry Leaders Using Conical Twin-Screw for Dual-Outlet Lines

Many global extrusion machine manufacturers integrate conical twin-screw designs in their dual-outlet pipe lines, including:

• Battenfeld-Cincinnati – Known for their TwinEX series with dual heads
• KraussMaffei Berstorff – Featuring conical screws in KMD series extruders
• AMUT – Customized solutions for WPC and PVC dual pipe extrusion
• Jwell Machinery – Providing reliable dual-extruder lines across Asia

These OEMs confirm the importance of precision screw-barrel systems tailored for dual outlet performance.

🏭 Our Dual-Outlet Conical Twin-Screw Solutions

At Zhoushan Juyuan Machinery Co., Ltd., we specialize in manufacturing custom conical twin-screws and barrels designed for dual-outlet extrusion lines.

• Tailored compression ratios and flight designs to ensure melt homogeneity
• Hardfaced screw surfaces and bimetallic barrels for abrasion resistance
• Precise CNC machining for perfect concentricity and fitment
• Compatible with major brands: KraussMaffei, Battenfeld, AMUT, Jwell, Theysohn

Whether producing PVC water pipes, CPVC hot water pipes, or WPC conduits, our screws support reliable, high-output dual extrusion.

📞 Contact Us for Your Dual-Outlet Screw Needs

If your line is running dual outlet pipes and you want to improve product quality and reduce downtime with optimized conical twin-screws, reach out to us.

📌 Zhoushan Juyuan Machinery Co., Ltd.
📧 Email: cxj.job@gmail.com
🌐 Website: https://juyuan-machinery.com/
📱 WhatsApp: +85244499051

Let’s boost your extrusion line’s efficiency and product quality together.