Line Components and Technologies
Aseptic filling and PET bottle sterilization
Aseptic technology gives a long shelf life without preservatives and without a heavy heat-stable bottle. The price is a sterile zone, a strict routine and significantly more expensive equipment.
Principle
The product is sterilized in-line at high temperature for a short holding time, then rapidly cooled. In parallel, the bottle and cap are sterilized. The connection of sterile product with sterile packaging happens in an isolated zone under overpressure of sterile air.
This scheme preserves taste and vitamins better than long heat treatment, and allows using a lightweight preform instead of a heat-stable bottle. On large runs the packaging savings noticeably exceed the equipment cost difference.
Key operations
- 1
UHT product treatment
Heating to 135-140 °C with a few seconds holding and subsequent rapid cooling.
- 2
Bottle sterilization
Hydrogen peroxide or peracetic acid treatment followed by sterile air blowing.
- 3
Cap sterilization
Separate treatment circuit in the feed path.
- 4
Filling in isolator
Filling in a closed chamber with overpressure of filtered air.
- 5
Capping inside the zone
The bottle is closed without leaving the sterile circuit.
- 6
Control and validation
Microbiological tests each shift, residual sterilant control.
Aseptic vs. hot fill
| Indicator | Aseptic | Hot fill |
|---|---|---|
| Preform weight | 20-30% lower | Higher: heat-stable bottle |
| Taste preservation | Better | Worse: long heating |
| Line cost | Significantly higher | Lower |
| Personnel requirements | High, separate routine | Standard |
| Break-even point | Large runs of one SKU | Medium runs, wide assortment |
FAQ
What shelf life does aseptic give?
For juices and beverages usually 9-12 months at ambient temperature without preservatives. The exact figure is confirmed by tests of the specific recipe.
Can hot fill be converted to aseptic?
In practice this means replacing the filling block and adding a sterile zone, effectively a new line. It is cheaper to plan aseptic from the start.
Does aseptic suit dairy products?
Yes, this is the standard technology for UHT milk and dairy-based drinks. The routine is stricter than for acidic juices.
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