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Application of stacked discharge setups at atmospheric pressure for packaging sterilisation

: Heise, M.; Trompeter, F.-J.; Franken, O.; Lierfeld, T.; Neff, W.


IEEE Nuclear and Plasma Sciences Society:
ICOPS 2002, 29th IEEE International Conference on Plasma Science. Conference record. Abstracts : Banff, Alberta, Canada, May 26 - 30, 2002
Piscataway: IEEE Operations Center, 2002
ISBN: 0-7803-7407-X
International Conference on Plasma Science (ICOPS) <29, 2002, Banff/Alberta>
Conference Paper
Fraunhofer ILT ()
stacked discharge setup; atmospheric pressure; packaging sterilisation; environmental need; economical need; food; health care; packaging; low-temperature sterilisation technique; nonthermal atmospheric pressure plasma; thermolabile plastic packaging material; Polyethylene-terephthalate (PET); UV radiation; plasmachemical effect; UV-irradiation; stacked setup; planar UV emission; excimer light source; dielectric barrier discharge plasma; sterilisation efficiency; spore; Bacillus subtilis; sterile packaging

Summary form only given, as follows. Environmental and economical needs for food or health care packaging require the development of new efficient low-temperature sterilisation techniques. We investigate the application of non-thermal, atmospheric pressure plasmas for sterilisation of thermolabile plastic packaging materials like polyethylene terephthalate (PET). The investigation resulted in UV radiation as one main inactivation pathway but also plasmachemical effects occur. In order to enhance the UV irradiance on the sample a new stacked setup combining planar UV emission (e.g. from excimer light sources) with dielectric barrier discharge (DBD) plasma has been built. Experimental results that show a significant increase of sterilisation efficiency for spores of bacillus subtilis compared with standard DBD setups are presented. Almost sterile packaging can be reached now within a few seconds with the described setup.