Influence of Mold Structure on Cushioning Performance of Fiber-molded Products

LIU Hai; ZHANG Dianfei; HUANG Liqiang

doi:10.19554/j.cnki.1001-3563.2025.15.009

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Packaging Engineering ›› 2025, Vol. 46 ›› Issue (15) : 86-92. DOI: 10.19554/j.cnki.1001-3563.2025.15.009

Special Topic on Sustainable Packaging Technology Innovation and Industrial Development

Influence of Mold Structure on Cushioning Performance of Fiber-molded Products

LIU Hai, ZHANG Dianfei, HUANG Liqiang^*

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Abstract

The work aims to investigate the cushioning performance of molded paper fiber products with different mold structures, focusing on deformation, energy absorption, and elastic recovery. Samples were prepared using a mixed plant fiber pulp (bamboo, bagasse, and wood) via wet molding and in-mold drying processes. Static compression and dynamic impact tests were conducted to compare the load-displacement behavior, energy absorption at varying compression levels, and peak acceleration under different impact masses for both traditional and low-stress mold design. Results showed that at 50% deformation, the traditional structure withstood a load of 3 200 N, 25% higher than the 2 800 N load of the low-stress structure. The energy absorbed was 14 000 J for the traditional and 15 000 J for the low-stress design. The low-stress structure exhibited approximately 15% higher elastic recovery. Within an impact mass range of 0.85-2.75 kg, minimum peak accelerations occurred at 1.5-2.5 kg, with the low-stress design consistently showing 30% lower peak accelerations compared with the traditional structure. In conclusion, the low-stress structural design more effectively reduces stress on packaged items, offers improved protective performance under both static and dynamic conditions, and enhances manufacturability through increased draft angles, providing a valuable reference for the structural design and application of molded fiber packaging.

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fiber molding / structural changes / draft angle / mold performance testing

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LIU Hai, ZHANG Dianfei, HUANG Liqiang. Influence of Mold Structure on Cushioning Performance of Fiber-molded Products[J]. Packaging Engineering. 2025, 46(15): 86-92 https://doi.org/10.19554/j.cnki.1001-3563.2025.15.009

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