Reciprocating Screw Element

Reciprocating screw elements are modular segmented screw units exclusively for reciprocating single-screw pin extruders. Different from conventional continuous single-screw and twin-screw components, they adopt interrupted trapezoidal flight structure. Combined with fixed barrel pins and the composite motion of screw rotation plus axial reciprocation, they realize full-area uniform mixing under low melt pressure. They are divided into four standard modules: conveying, compression, pin-slot mixing and metering pressure-stabilizing segments, which can be freely combined for filled compounds, masterbatches and heat-sensitive material modification.

• Intermittent Broken Trapezoidal Flight Structure 
  Flights are segmented and interrupted within one screw pitch (3-cut or 4-cut standard design), forming channels for pins to pass through. The integral trapezoidal flights feature high strength and wear resistance, suitable for high-filler powder abrasion conditions.
• Modular Split Sleeve Structure 
  All elements are sleeved independently on a hollow cooling shaft for easy disassembly and replacement. The hollow shaft allows water circulation for precise temperature control; standard types include feed conveying, compression plasticating, mixing and metering segments.
• Precision Clearance Matching with Barrel Fixed Pins 
  Pin channels match 3/4 rows of static pins on the barrel liner. Pins fully insert into flight gaps to form an ∞ relative motion track, eliminating dead zones for material retention.
• Customizable Pitch & Reciprocating Stroke Ratio 
  Pitch, channel depth and stroke matching ratio are customizable. Large pitches for high-capacity conveying, shallow channels for high-shear mixing, deep channels for low-shear heat-sensitive formulations

• Composite Motion: Rotation + Axial Reciprocation 
  The screw completes one full axial reciprocation per revolution. Static pins shuttle through interrupted flight slots, subjecting materials to both radial shear and reciprocating axial backmixing to break simple laminar flow.
• Full-Melt Uniform Shear Without Local Hot Spots 
  Relative sliding between pins and interrupted flights delivers even shear to all melt inside channels, instead of only a thin melt layer bearing intensive shear. Shear heat distributes evenly to avoid thermal degradation.
• Controllable Axial Backflow Boosts Distributive Mixing 
  Reciprocating movement generates mild axial backflow. Materials are repeatedly split, folded, turned and stretched, achieving excellent distributive mixing together with mild dispersive breakdown of pigment/filler agglomerates.
• Mutual Self-Wiping Between Pins & Flights 
  Pins continuously scrape channel bottoms and flight sides. Reciprocating motion automatically removes residual material, enabling fast color change and barrel cleaning.
• Gradient Conveying & Stable Discharge Pressure 
  Pitch gradually reduces along the screw to compact and plasticate solids. The terminal metering segments maintain constant channel volume to stabilize melt pressure and uniform extrusion output.

• Convey solid pellets/powders, compact and plasticate solids into homogeneous continuous melt.
• Deliver uniform mild shear to simultaneously realize dispersive mixing (breaking agglomerates) and axial distributive homogenization.
• Realize full self-wiping with barrel pins, eliminate stagnant dead zones for heat-sensitive and color-prone materials.
• Gradually adjust melt pressure and residence time under low overall pressure, improving devolatilization and liquid additive feeding efficiency.
• Modular assembly allows flexible tuning of mixing intensity and throughput for diverse formulations.

• Targeted Material & Process Optimization: Optimize base material formulation and heat treatment processes to improve wear resistance, corrosion resistance and impact resistance
• Custom Production per Drawings & Samples: Precisely manufacture replacement elements perfectly compatible with your equipment
• 100% Full Inspection Before Delivery: Complete dimensional quality inspection with full inspection reports
• 24-Hour Responsive After-Sales Service: Exclusive after-sales channels with 24-hour response time
• Professional Selection & Process Consultation: Technical advice on screw element configuration, material selection and screw arrangement solutions
• Reverse Engineering & Non-Standard Customization: High-precision reverse engineering for obsolete equipment models
• Rapid Prototyping & Small-Batch Trial Production: Support for new solutions to shorten R&D cycles
• Service Life Assessment & Optimization Guidance: Regular product status tracking and wear detection
• Flexible Stock & Delivery Guarantee: Safety stock service for regular spare parts and urgent orders

• Properties: High precision, high quality, long service life, wear-resistant, corrosion-resistant and durable.
• Compatibility: Compatible with most well-known extruders