Why does vacuum packaging leak air after being stored for a period of time?

The main causes of vacuum packaging leaks include: material risks (such as insufficient thickness of packaging bags, poor barrier properties, crystal point defects in aluminum-plastic films, and material compatibility issues), process defects (such as insufficient heat-sealing temperature, impurities mixed in during sealing, excessive vacuuming, and folded seals), as well as content and environmental factors (such as punctures from sharp objects, gas production by food bacteria, temperature and humidity fluctuations, and transportation vibrations). To address leakage issues, comprehensive whole-process control is necessary, covering material selection and matching, process control, storage and transportation optimization, and consumer inspection.