Technical advantages of the new conical twin-screw extruder

The new type of conical twin-screw extruder is mainly divided into two categories: the new counter-rotating conical twin-screw extruder and the conical co-rotating twin-screw extruder (high-efficiency and energy-saving type). Each type has its own technological advantages, but the core advantages revolve around plasticizing stability and energy saving for increased production:

I. Core Advantages of the New Counter-rotating Conical Twin-Screw Extruder

This is currently the mainstream upgraded model in the PVC processing field. Its core technological advantage comes from structural optimization:

1. Dual compression ratio design for more complete and uniform plasticizing: Adopting a "double cone" + gradually changing screw pitch design, it forms a dual compression ratio with varying screw groove depth and gradually changing screw diameter. The overall compression ratio is greater than that of a parallel twin-screw extruder, ensuring a plasticization degree $\ge95\%$ while reducing heat stabilizer consumption by $12\%$.
   
   
2. High-Pressure Stable Molding, Higher Finished Product Precision: Volumetric conveying can generate high axial pressure of 20-50MPa, increasing material bulk density by $15\%$-$25\%$. This effectively counteracts internal stress from cooling contraction. For example, in PVC pipe production, roundness error can be controlled within $0.5\%$, with dimensional stability far exceeding traditional models.
   
   
3. Adaptable to Heat-Sensitive/Highly Filled Materials, Low Degradation Risk: The gradually changing screw diameter results in lower circumferential thread speed, lower shear rate, and less heat generation, making it particularly suitable for heat-sensitive materials like PVC, preventing overheating degradation. It also exhibits stronger adaptability to highly filled systems with calcium carbonate content >60%, resulting in more uniform dispersion.
   
   
4. Optimized Structure Enhances Transmission Stability: A large space for the tail bearing and a larger center distance of the gearbox output shaft allow for larger bearings, resulting in stronger load-bearing capacity, higher working torque, and better long-term operational stability.

II. Core Advantages of the High-Efficiency and Energy-Saving Conical Co-rotating Twin-Screw Extruder (New Upgraded Model)

This next-generation technology combines the advantages of conical counter-rotating and parallel co-rotating twin-screw extruders. Its core advantages are high output and low consumption:

1. Significant Energy Saving and Output Increase: Combining the conical screw structure with co-rotating design, it saves approximately 30%-50% more electricity than traditional models, with an actual power density as low as 0.07 kW/(kg·h), and output more than doubles.
   
   
2. Superior Mixing and Plasticizing Performance: The material moves along an 8-shaped/S-shaped path within the barrel, extending the plasticizing time and allowing for more uniform mixing of pigments, fillers, and base materials. This avoids problems such as color difference and uneven composition, making it suitable for applications requiring high mixing standards, such as modified plastics and filler masterbatches.
   
   
3. Controllable Shearing + Strong Self-Cleaning Capability: Shearing intensity can be precisely controlled by adjusting screw speed and clearance. Low shear is suitable for heat-sensitive materials, while high shear is suitable for high-filler systems. Simultaneously, the precisely designed screw clearance (0.02-0.04mm) provides a self-cleaning function, reducing material residue carbonization and shortening material changeover time by more than 30% during frequent color changes.
   
   
4. More Stable Transmission System Design: The use of a thrust elimination box and torque distribution box separates axial thrust and torque loads, significantly improving transmission stability and equipment lifespan.