Material Analysis
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PET bottled water taste change
Problem Phenomenon
After bottled drinking water is stored for a period of time, a plastic taste and a cloying sweet taste appear, and water quality testing finds migration of odorous substances.
Cause Analysis
The acetaldehyde AA content of the bottle body is too high, and during storage AA migrates from the bottle wall into the water body; unqualified raw material or excessively high processing temperature leading to excessive AA generation is the direct cause.
Solution
①Adopt low-temperature preform injection and low-temperature bottle blowing processes; ②test the AA content of the raw material before processing; ③reject preform batches with excessive AA; ④shorten the melt residence time.
Key Takeaway
Water taste change can almost be pinned down as the AA migration problem; mineral water is most sensitive to AA, which must be controlled from both ends of incoming-material AA and processing temperature, with sensory and headspace testing performed before leaving the factory.
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