Technical Details of Forward Kneading ElementsStructural GeometryComposed of multiple kneading discs stacked with circumferential stagger angle, forming forward‑helix tendency after staggering. - 30° Forward KB: Small stagger angle, strong forward conveying capacity, mild shear.
- 45° Forward KB: Industry general standard, balanced conveying and shear performance.
- 60° Forward KB: Reduced conveying capacity, significantly increased shear intensity.
- 90° Neutral KB: No forward‑pushing capacity; materials pass only by leakage flow driven by upstream pressure.
Material Configuration- 38CrMoAlA Nitriding Steel: General modification working conditions
- WR5: High‑wear conditions for glass‑fiber and mineral filling
- WR13: Wear‑resistant & corrosion‑resistant, for battery powders and corrosive melts
- Nickel‑base Alloy: Reactive extrusion under severe‑corrosion conditions
Manufacturing ProcessIntegral forging and quenching‑and‑tempering heat treatment; grinding for outer circle and end face of kneading discs; intermeshing clearance strictly controlled; fillet transition at disc root reduces material hanging‑up risk, and guarantees torque‑bearing capacity of spline. Process Parameter Characteristics- Shear level: Medium‑high shear; 30°＜45°＜60°＜90°
- Conveying capacity: Slight forward conveying; conveying capacity decreases as stagger angle increases
- Shear heat: Medium‑high; melt temperature rise increases obviously with larger stagger angle
- Mixing type: Strong dispersive mixing plus good distributive mixing; 45° delivers optimal comprehensive dispersive performance
- Self‑cleaning performance: Excellent, full‑intermeshed mutual wiping structure
- Filling degree: Medium filling, not nearly full‑filled as reverse kneading blocks
- Residence time: Moderate; residence time extends with larger stagger angle
| Functions of Forward Kneading Elements• Realize resin melting and plasticization Shear input converts mechanical energy into shear heat to promote complete melting of solid particles. It acts as the core element within melting section of screw configuration. • Break hard agglomerates for dispersive mixing Powerful shear generated by disc clearances breaks hard agglomerates of carbon black, color pigments and inorganic fillers to achieve fine filler dispersion. Forward kneading blocks are the key components for masterbatch and filled modification dispersion • Homogenize material distribution Discs split, fold and exchange melt streams to improve homogeneity of melt temperature and composition. •Intrinsic forward‑pushing effect to lower blockage risk Compared with reverse kneading blocks and 90° neutral kneading blocks, it provides slight forward conveying force for continuous material flow and less pressure‑build‑up and blockage risk. Multiple discs can be used in series as assembled groups. |
