Polymers Extrusion & Pelletizing


Who should attend?

  • This course provides the know-how for an autonomous job position in the operation and maintenance of extruders and pelletizers.
Audience :
  • Operating staff in charge of driving extruders and ancillary equipment.
  • Technicians involved in the operation or maintenance of this type of installation.

Level : Proficiency

Course Content


      • Aim of the extrusion, general layout description and the various steps of the polymer treatment.
      • Operating principle of raw material feeding system.
      • Operating principle and different cross section areas: feeding system, filling, melting, degassing, compression, transport, pelletization.
      • Different types of screws, advantages and drawbacks.
      • Different types of extruders: single screw, counter-rotating or co-rotative twin screw, BUSS type mixers, advantages and drawbacks.
      • Operating principle of pellets conveying.

      • Drivetrain: the drivers and launch, variable speed drives, gearboxes, sustained efforts, safety and overload structure of abutments, the extruder auxiliary.
      • Extruder: power, force feeder, preventing jams; different section of screw and barrel, adjusting the temperature; starting diverter valve and start-up operation; fouling filters monitoring and filter changing device, the die plate: technology, different heating systems, pressure monitoring, calculating the percentage of blocked holes, risk of damage. The pelletizer, different cutting systems, calculation and adjustment of knifes speed, water flow, water temperature, monitoring of pellets size.
      • Principle of heat exchange in the die plate and temperature control.

      • Review of the machine logic (flow charts, logic diagrams).

      • Different grades manufactured; specifications in relation to the applications.
      • Laboratory tests: equipment procedures, visualization of various types of defects.

      • Fluidity, viscosity dynamic viscosity, definition, effect of shear rate, kinematic viscosity, melt index (MI).
      • Consequences: monitoring the temperature as a function of grade and load.
      • Required power: the influence of the load, the MI and temperature recommendations.
      • Equipment reliability.
      • Application: study of possible causes of troubles, solutions, points to be checked.

Learning Objectives

  • Upon completion of the course, the participants will be able to:
  • know about the phenomena behind an extruder,
  • analyze settings, security and automation,
  • interpret drifts and incidents in order to react efficiently.

Ways & Means

  • Content may be customized for a particular type of machine or for products if information is provided at least one month in advance.
  • Otherwise, standard products are covered: PolyEthylene, PolyPropylene. It can be implemented on specialties polymers and compounds.
  • Case studies based on industrial situations.