Screens – an important part of the cutting process

Regrind is considered good when it is free from dust and is of uniform size with smooth cut edges. Conversely, bad regrind is torn apart, showing frayed edges, has excessive dust and is non-uniform in size, and increase the risk for bridging in granulator as well as upstream in the evacuation system.

  • Screens are an important part of the granulation process – much of the cutting takes place between the screen and the rotating knives
  • Screen holes must have fresh crisp edges to produce high quality regrind
  • A worn screen shows oval shaped holes with rounded edges and is more tearing the plastic apart producing more dust and uneven regrind
  • Granulator output is proportionally correlated to the screen hole diameter, a small increase in hole diameter can mean a big increase in granulator capacity. 

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