PET Asept D system for UHT dairy products

Krones developed a dry sterilization process using hydrogen peroxide (H₂O₂) especially for the dairy industry, where H₂O₂ sterilization is the established process and is even required for certification by some countries’ oversight agencies.
H₂O₂ sterilization also offers considerable advantages when sport caps like push-pull or flip-top caps are used. Another major reason for using H₂O₂ is the low water consumption and waste water generation. Krones uses true dry sterilization with H₂O₂ gas to sterilize packaging materials. In this process, the bottles are warmed to a treatment temperature of 50-60 °C, and then sterilized with hydrogen peroxide gas, and condensation is prevented.
The advantage of this dry sterilization process lies in the use of moderate temperatures, which make it possible to allow virtually any treatment times without damaging the PET containers. Another clear advantage of the Krones PET Asept D system and the elimination of condensation is that the blow-molder can be directly blocked with the aseptic bloc.


The Krones H₂O₂ concept achieves the three specified aims:

• Log 5 kill rate in bottle for bacillus subtilis (atrophaeus) and aspergillus niger spores according to a count reduction test
• Defined residual concentration of H₂O₂ under 0.5 ppm in keeping with FDA regulation
• Minimal shrinkage (less than 5%).