RH‑LH Melt‑Seal Screw Element

Combined RH‑LH melt‑seal screw element, custom‑built by sample reverse‑engineering. Integrate forward & reverse flights in one monolithic piece, equivalent to stacked RH‑LH combination for melt‑seal function, compact axial size.

• Vent port protection: Installed upstream of vacuum or atmospheric vents. Forward flight conveys melt downstream while reverse flight pumps melt backward. Material is compressed in the middle zone to form a dense melt plug, helping mitigate melt blow‑out at vent openings.
• Pressure peak generation: Reverse flight creates back‑pressure to raise upstream degree‑of‑fill, providing high‑pressure sealing condition for liquid injection, side feeding and reactive extrusion. Pressure drops when melt passes to downstream large‑pitch forward elements, creating low‑pressure zones for feeding and devolatilization.
• Residence‑time adjustment: Material accumulates against reverse flight to increase local residence time and improve melting and mixing performance.
• Process‑zone isolation: Separates melting zone from devolatilization zones or vent sections under different vacuum levels and reduces cross‑pressure interference.

• This monolithic construction removes assembly gap between forward‑ and reverse‑flight sections, eliminating stagnation risks originating from mating‑face clearance.
• It enables a more compact axial installation dimension.
• The geometry theoretically allows a sharper pressure build‑up; actual performance depends on polymer property and process parameters.

(Suitability shall be validated according to real‑world process conditions.)

• 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