This invention discloses a preparation process for paper boxes used for
food preservation and the resulting
food preservation paper box, belonging to the field of packaging product technology. This invention constructs a dynamic
covalent bond gradient interface and forms a strong anchoring-weak cohesive gradient structure by regulating the
binding energy between fibers and functional
layers, achieving a low
fiber damage rate after multiple paper box cycles. A functional
adaptation layer is simultaneously applied at the outlet of the
paper machine's
drying section, utilizing the
water layer adsorbed on the
fiber surface to achieve synergistic anchoring of interpenetrating network physical entanglement and chemical
grafting. The core paper is micro-injected using
hot press rollers, with molten
chitosan-PEG graft material encapsulating softened PLA particles at 130°C, rapidly forming a mechanical
interlocking structure within 2 seconds. Multi-scale synergistic slow release is achieved through spatial separation of modular slow-release tablets and electrostatically flocked
citric acid. When
humidity is triggered, water acts as a
proton conductor at the interface, avoiding pre-reaction. Diatomaceous earth channels adsorb some NaClO2, forming a secondary release reservoir and extending the peak
release time.