Twin-screw Configuration Co-rotating Screws

Polymer materials flow in different patterns in the melting section of the screws. This is due to the different degree of filling while compounding. However, a common characteristic is that solid pellets 

The power required for compounding in a twin-screw extruder is a summation of the power to feed the raw materials and heat required to melt and heat the polymer. The major proportion of the power required by the extruder starts at the point where the polymer is fully melted and continues to the end of the extruder. The calculation of power needs takes into account the influence of the flights, heat transfer within the barrel and viscosity which is dependent on melt temperature and shear. Therefore, the power is determined from a torque balance for the screw multiplied by screw speed [4-8]. 

During polymer processing, granules are better than pellets and powder is better than granules from a mixing point of view. Smaller particle sizes may lead to other problems though, such as 

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