Based on the design concept of "reuse and energy conservation" for packaging, the work aims to investigate the buffering performance of composites with plastic filling in corrugated structural components, to explore new paper-plastic composite structures that can replace plastic foam and address the low applicability and poor resilience of all-paper buffering structures under high stress conditions. Through edge compression tests on corrugated cardboard and static compression tests on corrugated structural components, the theoretical derivation formula for the critical load of triangular corrugated cardboard structural components was verified to be applicable to "double-wall" corrugated cardboard structural components. Meanwhile, the stress-strain curves and energy absorption efficiency-stress curves of EPE, starch-based foamed plastic, corrugated cardboard structural components, and two types of paper-plastic filled composites were compared and studied. It was found that the yield strength of the paper-plastic filled material increased by 27% compared with that of the single material. The optimal energy absorption efficiency corresponding to different buffering materials varied. When σ<0.09 MPa, foam materials had better energy absorption efficiency. When σ>0.12 MPa, the energy absorption efficiency curve of the paper-plastic filled material showed an "S" shape. After EPE was filled into the corrugated structural component, the maximum energy absorption efficiency increased by 2 times, while after starch foamed particles were filled into the corrugated structural component, the maximum energy absorption efficiency increased by 57%. However, humidity could negatively affect the buffering performance of paper-plastic materials filled with starch-based foamed particles. It was recommended to use them in an environment with a relative humidity below 70%. The paper-plastic filled composite structure effectively combines the supportability of paper with the resilience of plastic, while providing a new way for energy-saving reuse of plastic recycling or processing scraps, offering new ideas for green buffering packaging design.
Key words
combined cushioning structure /
paper-plastic filled material /
cushioning material
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