Controlling Hot Air Mixtures
Controlling moderate temperatures of H₂O₂ – hot air mixtures is required for cleaning (disinfecting) PET bottles.
●Hydrogen peroxide (H₂O₂) can be used in three different ways to disinfect packaging materials:
■As a liquid
■In the vaporous state with subsequent condensation
■In a gaseous state
●Very high temperatures are required when liquid H₂O₂ is used. Furthermore, the liquid H₂O₂ has to be removed from the containers. This step is quite time consuming, rendering the process impracticable except under certain circumstances.
An application which is taken advantage of very frequently is based upon the use of vaporous H₂O₂ which condenses onto the surfaces of the container or the cap, and is activated during drying at higher temperatures. This step results in a considerable disadvantage for the process: PET is a thermally sensitive packaging material and may shrink at high temperatures. Lower temperatures or shortened activation times are not necessarily the answer, because the risk of inadequate disinfection or contamination of the product with residual H₂O₂ would thus increase.
The third possibility is based on the use of gaseous H₂O₂. In this case, bottles which have been preheated to a temperature of 50 to 60° C are exposed to gaseous H₂O₂. Condensation of the H₂O₂ is avoided during disinfection.
The prerequisite for successful container disinfection within a short period of time is a sufficiently high concentration of H₂O₂ in the gaseous phase. In order to assure this without any condensation of the H₂O₂, the temperature of the PET bottles and caps must always be higher than the dew point of the gaseous H₂O₂.
The PET bottles are disinfected using moderate temperatures is several consecutive steps. These temperatures make it possible to extend the duration of exposure to the gaseous H₂O₂ almost indefinitely, without damaging the PET containers.
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