Process Engineering

Filtration - a procedure

Polymer melts contain foreign substances and inhomogeneities which badly effect extrudate depending on dimension and quantity.

Such contamination and inhomogeneity lead to:

• breakage of fibres
  (while spinning)
• hazes
  (in blown film)
• changes of resistance
  (in cable coating)
• weak spots
  (in pressure pipes)

Filtration has met two challenges:

1. The recycling of post-consumer material and manufacturing waste have gained economic importance
2. The constantly increasing quality standards necessitate the filtration when processing an ever increased range of plastics.
   (An example is the production of polyamide or polycarbonate pellets for optical applications such as mobile displays.)

Filtration is very important in compliance to high quality standards and essential for high quality production.