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An industrial PET mineral water line has four stages: water treatment and storage, PET bottle preparation, rinsing-filling-capping in a positive-pressure HEPA chamber, and labeling and packing. The main challenge is microbial control and preventing re-contamination, not only reaching pure water.
The four stages
- Water treatment and storage: raw well or groundwater passes coarse filtration, heavy-metal and odor removal, RO for purified water, and Ozone/UV microbial treatment before entering SUS 316L intermediate tanks.
- PET bottle preparation: blown bottles travel by air conveyor to the filling clean room, where they are sanitized and rinsed with ultra-clean ozonated water.
- Rinse, fill, cap: a 3-in-1 filler (rinsing, metered filling, capping) operates inside a positive-pressure chamber with HEPA filtration that keeps outside air out.
- Labeling and packing: inspection for foreign matter, shrink-sleeve or adhesive labeling, laser date coding and automatic shrink-wrapping into packs of 6, 12 or 24 bottles.
Water treatment design
There is no single filtration setup for every plant. The source water must first be tested for physical, chemical and microbiological parameters; depending on dissolved minerals (TDS), hardness and microbes, engineers design the appropriate system.
- Pre-treatment: coarse filters, activated carbon and ion-exchange media remove sediment and organics, color and odor, and soften the water.
- Fine and microbial filtration: micron cartridges (5 to 1 micron) retain very fine particles.
- High-level sterilization: Ozone/UV bottle sanitizing plus controlled ozone dosing in the water, which kills microbes quickly and leaves dissolved oxygen that helps resist re-contamination in storage tanks.
Read the full technical article in Vietnamese
Frequently asked questions
What are the main stages of a mineral water bottling line?
Water treatment and storage, PET bottle preparation, rinse-fill-cap, then labeling and packing.
Why is the filling chamber positive-pressure?
A HEPA-filtered positive-pressure chamber prevents outside air from entering, keeping the filling aseptic.
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