Continuous Kneader

Continuous Kneader

The B&P Littleford Continuous Kneader is a moderate-shear rotating and reciprocating single-screw extruder ideally suited for shear- and temperature-sensitive compounds. The flights on the screw are interrupted and interact with three rows of stationary kneading pins located in the barrel wall. The interaction between the moving flights and the stationary pins provide dispersive mixing and distributive mixing simultaneously.

Pressurization and discharge shaping of the output from Continuous Kneaders is executed by utilizing a separate metering device such as a melt pump or a single-screw discharge extruder. The inherent separation of the kneading step from melt pressurization step results in greater process flexibility (i.e. a wider processing window), improves mechanical energy efficiency (efficient mixing at high screw speed combined with efficient pumping at lower metering speed) and lowers the overall melt temperature.

Advantages of Continuous Kneaders

Process advantages of the B&P continuous kneader include: 

  • Peak shear rate is lower than other compounders
  • The continuous kneader operates at comparatively lower internal pressure
  • Excellent distributive mixing eliminates localized scorching that may be generated in the shear gap
  • Uniform shear and elongation:
    • Shear stress is dependent and proportional to screw speed and independent of screw diameter
  • Uniformity of temperature, pressure and narrow residence time distribution
  • Greater surface area, more free volume and higher specific torque capability
  • Total shear strain is controllable by adding or removing pins and flights
  • Ability to measure melt temperature or inject liquids at any point along the process
  • Efficient self-wiping mixing mechanism
  • Easy to clean split barrel results in faster product changeover

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Industries & Applications

B&P Littleford Continuous Kneaders are well-proven in applications requiring gentle kneading, dispersive mixing and distributive mixing. They have a very successful track record in processing:

Request a quote for more information on how your materials would process through a Continuous Kneader from B&P Littleford.