Buy Conical Twin Screw for Plastic Extruders – Sizing & Availability

Introduction to Conical Twin Screws in Plastic Extrusion

In the world of plastic extrusion, choosing the right conical twin screw is a critical decision impacting both production efficiency and product quality. These screws are specially engineered to offer exceptional mixing, melting, and conveying properties, making them indispensable in the manufacturing of pipes, profiles, sheets, and various plastic components.

At Shreeji Corporation, we recognize the evolving demands of modern extrusion operations. Whether you operate in PVC pipe manufacturing, WPC board production, or any plastic compounding industry, selecting the correct conical twin screw barrel is fundamental.

What is a Conical Twin Screw?

A conical twin screw comprises two intermeshing screws, shaped in a conical form, which rotate inside a specially designed barrel. This design offers superior material processing compared to parallel screws, particularly in high-pressure applications. Conical twin screws ensure:

  • Efficient melting

  • Enhanced mixing

  • Higher torque transfer

  • Reduced shear stress on materials

Benefits of Conical Twin Screw for Plastic Extruders

  • High Output Rates – Achieve faster production without compromising material integrity.

  • Energy Efficiency – Optimized design reduces power consumption.

  • Versatile Application – Suitable for rigid PVC, soft PVC, WPC, CPVC, and more.

  • Extended Service Life – Hardened, nitrided, and coated surfaces provide resistance to wear and corrosion.

Types of Conical Twin Screws Available

We offer a wide range of conical twin screw barrels, each tailored to meet specific extrusion demands:

  • Standard Conical Twin Screws

  • High-Torque Conical Screws

  • Customized Twin Screws for Special Materials

Sizing of Conical Twin Screws – How to Choose the Right One?

Selecting the appropriate screw and barrel size depends on several technical factors. Below is a detailed breakdown:

1. Screw Diameter

Common sizes include:

  • 45/90 mm

  • 55/110 mm

  • 65/132 mm

  • 80/156 mm

  • 92/188 mm

Screw diameter correlates with throughput rate and machine size. For small-profile extrusion, opt for smaller diameters like 45/90 mm; for large-diameter pipes or high-volume production, 92/188 mm is ideal.

2. L/D Ratio (Length/Diameter Ratio)

A typical L/D ratio for conical twin screws is 18-25:1, providing a balance between melting and mixing.

3. Barrel Length

Barrel lengths are optimized to the screw size, ensuring consistent temperature control and material processing.

4. Surface Hardness

Choose:

  • Nitrided screws for general applications.

  • Bimetallic screws for processing highly abrasive materials.

Material Options for Conical Twin Screws

  • Nitride Steel (38CrMoAlA) – Excellent wear resistance and surface hardness.

  • Bimetallic Alloy – Superior corrosion and abrasion resistance, ideal for filled or recycled materials.

Customization Options

We provide custom-designed screws for specialized processing needs. Customization includes:

  • Thread depth adjustments

  • Flight design optimization

  • Mixing section modifications

  • Special coatings for corrosion resistance

Applications of Conical Twin Screws

  • PVC Pipe Extrusion

  • WPC Board Manufacturing

  • Sheet Extrusion

  • Plastic Recycling

  • Profile Extrusion

Availability & Quick Delivery from Shreeji Corporation

As a trusted screw barrel manufacturer in India, we ensure:

  • Ready stock availability of standard screw sizes.

  • Custom orders fulfilled within 2-4 weeks.

  • Global shipping capabilities.

Why Choose Shreeji Corporation for Your Conical Twin Screw Needs?

  • Over 20 years of experience in precision manufacturing.

  • Strict quality control protocols.

  • Use of high-grade alloy steels.

  • Professional technical consultation support.

  • Competitive pricing and after-sales service.

Maintenance & Lifespan of Conical Twin Screws

Proper maintenance ensures longevity:

  • Regular inspection for wear.

  • Proper cleaning to avoid material build-up.

  • Use of compatible materials to minimize corrosion.

Frequently Asked Questions (FAQs)

Q. What is the typical lifespan of a conical twin screw?
 A. Depending on usage and materials processed, lifespan can range from 3 to 7 years.

Q. Can I replace just the screws without the barrel?
 A. Yes, provided the barrel is in good condition and within dimensional tolerances.

Q. Are bimetallic screws worth the investment?
 A. For abrasive or recycled material processing, bimetallic screws are highly recommended.

Request a Quote for Conical Twin Screw

At Shreeji Corporation, we help you select the perfect conical twin screw barrel for your extrusion line. Contact our experts for detailed technical guidance and pricing.

Contact Us Now

Conclusion

Investing in the right conical twin screw for plastic extruders can transform your production line, enhancing both efficiency and product quality. With our precision-engineered solutions, Shreeji Corporation stands as your reliable partner for all extrusion needs.

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