Backward Pumping Kneading Block

The backward pumping kneading block consists of staggered kneading disks, with the helix angle formed by the staggered arrangement consistent with the spiral direction of the reverse screw element. Its design integrates staggered disks and reverse threads to achieve backward material conveying. It extends the material residence time in the barrel, increasing filling degree and material pressure, and significantly enhancing mixing efficiency.

• Reverse structure creates conveying resistance: With an overall left-handed reverse spiral arrangement opposite to forward conveying elements, it forms natural resistance to the axial forward flow of materials, forcibly slows down material advancement and creates conditions for intensive mixing.
• Forced shear & stretching achieves dispersive mixing: Materials are forced to pass through the gaps and edges between kneading discs, undergoing repeated squeezing, shearing, folding and stretching. This efficiently breaks solid agglomerates such as pigments, fillers and additives to achieve fine dispersive mixing.
• Increases material fill degree and extends residence time: The conveying resistance significantly raises the material fill degree in upstream screw channels and prolongs the effective residence time of materials in the mixing zone, providing sufficient duration for full melting, plasticization and uniform component mixing.
• Builds local high pressure and stabilizes process operation: It forms stable local melt pressure in the element area, which not only strengthens inter-melt contact and mass transfer to improve distributive mixing, but also acts as a melt barrier to block unmelted particles and ensure uniform and stable downstream melt quality.
• Stream splitting & recombination enhances melt homogenization: Multiple kneading discs arranged at a fixed staggering angle continuously split, redirect and reorganize melt streams, disrupt laminar flow, promote full blending of components with different compositions and temperatures, and improve the overall uniformity of melt temperature and composition.

• Applied in plasticating, mixing and homogenizing zones
• Balances conveying capacity and compounding performance
• Achieves material melting, distributive mixing and uniform temperature homogenization
• Adaptable to most conventional extrusion processes including compounding, pelletizing and profile extrusion

• Well-balanced shear and conveying performance with broad process adaptability
• Symmetrical flow ensures stable material flow and good self-cleaning effect
• Reduces material retention
• High plasticating efficiency and uniform mixing quality for general and engineering plastics
• Mature and cost-effective solution with wide interchangeability across equipment models

• Targeted Material & Process Optimization: Optimize base material formulation and heat treatment processes to improve the 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 hours 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