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Exhaust air purification after film extrusion

The situation

Companies engaged in the production of plastic films work with different production processes:

  • Calendering
  • extrusion
  • Coextrusion
  • Blow extrusion
  • Blow co-extrusion
  • Coating / Laminating
  • Stretching / Orientation
  • Flexographic printing

Various precursors are used as plastics:

  • Polyethylene (PE)
  • Polypropylene (PP)
  • Polyvinyl chloride (PVC)
  • Polyester (PES)

The problem

These manufacturing processes have a high energy consumption and cause immissions into the ambient air, which require cleaning. The exhaust air contains oligomers or polymers of the plastic used and possible additives such as plasticizers, which help to determine the properties of the respective plastics.

The emissions after the manufacturing processes are extracted with exhaust fans and then cleaned of the particulate impurities with mechanical filters. In addition to oligomers, plasticizers will be proportionately present in the exhaust air. The plasticizers essentially belong to the group of ester compounds such as the phthalates (e.g. diethylhexyl phthalate or bisphenol).

The solution: UV ozone exhaust air purification

Exhaust air streams of this provenance can be purified using UV ozone technology. Both the oligomers and the aromatic compounds are degraded via the UV light and ozone. Before dimensioning the exhaust air system, a test phase is required so that the respective production conditions are included in the degradation concept.

The product


Clean Exhaust Air
UV ozone exhaust air purification system to meet TA Luft requirements


Storage reactor for air post-treatment after UV ozone cleaning

The result

The TA Luft is complied with. Pollutants and odors are eliminated before they can enter the environment.

The advantages

  • Low capital expenditure compared to incineration plants
  • Low operating costs
  • Can be used in both continuous and discontinuous drying systems
  • Low maintenance requirements
  • Low space requirement

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