Technical Details of SSK(SFV) ElementStructural Geometry• Single-start forward scooped thread profile with deep screw channel and extremely high free volume. • The working surface of screw flight adopts scooped curved surface to enhance material grabbing. • Unlike Erdmenger twin-start fully intermeshing threads, it has no complete mutual wiping meshing pair and features weak self-cleaning performance. • The inner bore is involute spline for interchangeable assembly and disassembly. • Model marking example: SSK (SFV)‑48/48, pitch 48 mm, element length 48 mm, mainly large lead design. Material Configuration• 38CrMoAlA nitrided steel: For ordinary pellets and general powder working conditions. • WR5: For high-wear powder and mineral filling applications. • WR13: Wear and corrosion resistance for battery powder and corrosive materials. • Nickel-base alloy: Used for highly corrosive working conditions. Manufacturing Process• Integral forging and quenching & tempering heat treatment. • CNC milling of scooped thread curved surface. • Large fillet at thread root to reduce material adhesion and accumulation. • Strictly control outer diameter dimension and torque bearing capacity of spline. Process Parameter Characteristics• Shear level: Almost no shear • Conveying capacity: Extremely strong grabbing and conveying for solid materials, suitable for loose powder • Shear heat: Extremely low • Mixing type: Barely any mixing, only for conveying • Residence time: Low filling degree in feeding section • Self-cleaning: Poor, with risk of material stagnation, not applicable to melt conditions | Functions of SSK(SFV) Element•Super grabbing capacity to solve feeding bottleneck of low bulk density powder: The scooped screw flight scoops fluffy powder, fibrous materials and recycled foamed materials. It eliminates bridging and slipping problems and greatly raises the feeding limit of main extruder, preferably applied in main feeding section and after side feeding. •Low-temperature pushing of solid materials to avoid pre-melting slipping: Almost no shear input and no shear temperature rise during solid conveying, preventing premature melting of powder and adhesion to screw channels which leads to feeding failure. • Large volume to accommodate high-filled powder: Ultra-large screw channel volume adapts to formulations with high powder content, provides sufficient accommodation space for loose materials and increases throughput. | 
