2025 is set to become a turning point for the plastics industry. Under the EU's Packaging and Packaging Waste Regulation (PPWR), PFAS will be comprehensively banned in food-contact materials. France has also introduced phased legislation to eliminate PFAS from textiles and cosmetics, with plans to fully prohibit fluorinated polymers. This environmental wave targeting so-called "forever chemicals" is forcing companies worldwide to accelerate the development of PFAS-free alternative materials.
Non-fluorinated flame retardants (such as phosphorus- and silicon-based systems) exhibit viscosities 30–50% higher than traditional fluorinated materials, making uniform dispersion difficult while increasing corrosiveness;
Bio-based flame retardants have a narrow processing window and are highly temperature-sensitive;
Mineral-based PFAS-free flame retardants impose extremely demanding wear-resistance requirements on screw elements.
Specially designed high-dispersion screw elements ensure uniform distribution of non-fluorinated flame retardants. Elements manufactured from HIP-processed powder alloy materials are available, significantly extending service life under severe wear and corrosion conditions;
Cold roll–formed mandrels with torque capacity of 13–15 Nm/cm³ are compatible with high-torque twin-screw extruders, ensuring stable operation and meeting the high-viscosity processing demands of PFAS-free materials;
Bimetallic barrel structures with nickel-based alloy liners offer corrosion resistance 2–3 times higher than conventional nitrided steel under high-temperature conditions, substantially extending barrel service life. In addition, the annular cooling water channel design ensures temperature fluctuations of bio-based PFAS-free materials are controlled within ±1°C.
As the global plastics industry undergoes restructuring driven by PFAS bans, Nanjing Lesun Screw, backed by 20 years of technical expertise, provides a one-stop solution—from material compatibility to process optimization of screw configurations for PFAS-free plastics.
Choosing Lesun Screw is not merely a choice of extrusion components, but a strategic investment in regulatory compliance, competitive advantage, and a sustainable future.
Primary feeding barrel introducing raw materials into the extruder under controlled fill and stable conveying conditions.
Best suited for:
Main material feeding
Pellet and powder input
Stable process start
Six-sided geometry enabling uniform torque transfer and rapid screw element replacement.
Best suited for:
Powder coating
Frequent material changes
Fast screw configuration changes
Fully enclosed barrel ensuring stable melting and pressure build-up under high fill and controlled processing conditions.
Best suited for:
Melting sections
Pressure build-up zones
Stable conveying conditions
Simple keyed design for basic torque transmission in low-load extrusion systems.
Best suited for:
Low torque applications
Legacy extruders
PVC processing
Stretching elements, also called S-type elements, improve material exchange and distributive mixing in partially melted zones.
Best suited for:
Semi-plasticized material zones
Improved dispersion
Gentle mixing processes
Barrel with vent openings enabling efficient removal of volatiles under controlled partial fill and pressure conditions.
Best suited for:
Devolatilization
Moisture removal
Vacuum venting sections
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