In plastic scrap recycling, balancing production efficiency, energy costs, and pellet quality has always been a core challenge. For years, the “agglomerator + single screw extruder” combination has been the default solution for handling light, fluffy materials such as films and woven bags.However, Counter-Rotating Twin-Screw Pelletizing technology has now matured, fundamentally challenging this traditional process.

This article delivers a direct comparison between the agglomerator-based route and Counter-Rotating Twin-Screw Pelletizing, showing why more high-quality recycling plants are switching to the one-step, energy-efficient pelletizing system.

How an Agglomerator Works and Its Energy Defects

An agglomerator uses high-speed rotating blades (1,000–1,500 rpm) to shred fluffy films and scraps, generating frictional heat that raises the material temperature to a semi-molten state, finally compacting it into irregular small agglomerates. These agglomerates are then fed into a single screw extruder for melting and pelletizing.

The agglomeration process, while seemingly simple, hides enormous energy waste:

• Motor power: Mainstream agglomerators use motors rated at 90–132 kW.

• Energy distribution: 80%–90% of that energy is consumed by friction-generated heat between the blades and the material. Only 10%–20% is actually used for mechanical shredding.

• Core issue: Frictional heat is typical ineffective work – it neither promotes efficient mixing nor improves material flow; it only accelerates thermal degradation.

In practice, for every $10 you pay for electricity, $8–9 is wasted on heat generation – and you often need extra cooling systems to bring the temperature down.

Counter-Rotating Twin-Screw Pelletizing vs. Agglomerator

Key takeaway: The counter-rotating parallel twin-screw solution not only eliminates a 110 kW high-power agglomerator, but more importantly, removes the ineffective frictional energy waste of the agglomeration step, using electricity only for actual melt extrusion.

Why Do Many Recyclers Still Use Agglomerators?

But the landscape is changing. Rising electricity costs and tightening environmental regulations are steadily eroding the economic advantage of agglomerator-based lines. While others may stick to the old path for the reasons above, more forward-looking operations are recognizing that continuing with an agglomerator means paying a hidden “inefficiency tax” every single day.

Four Key Advantages of Counter-Rotating Parallel Twin-Screw Pelletizing

Real Case

Conclusion

Agglomerators served a purpose – they solved the “fluffy material feeding problem” in their time. But today, with high electricity prices, quality competition, and tightening environmental regulations, sticking with the “friction heating” approach is giving away your competitiveness.

The counter-rotating parallel twin-screw pelletizing system replaces frictional compaction with forced conveying, and double thermal history with single-step heating. It delivers >100 kWh/ton energy savings and pellet quality improvement by at least one grade, fundamentally reshaping the economics of recycling pelletizing.