摘要
目的研究不同模体结构下,纸纤维模制品形变、能量吸收和弹性恢复等缓冲性能的差异。方法以植物纤维混合浆(竹浆、甘蔗浆、木浆)为原料,采用湿法成型与模内干燥工艺制备纤维模制品,通过静态压缩和动态冲击等测试,研究传统模体结构和低应力模体结构的载荷位移、不同压缩位移下的能量吸收、动态冲击随质量变化下峰值加速度变化等表现。结果2种模体结构变形达到50%时,传统结构体的载荷达到3200 N,低应力结构体的载荷达到2800 N,传统结构体反作用到产品上的载荷值增加了25%;此时传统模体吸收能量为14000 J,低应力模体吸收能量为15000 J;低应力模体结构在弹性恢复方面明显优于传统模体结构,弹性恢复率高出约15%;在0.85~2.75 kg冲击质量范围内达到峰值加速度最小值的重锤质量均在1.5~2.5 kg内,其中2次冲击测试均表现出低应力模体结构的峰值加速度低于传统模体,峰值加速度仅为传统模体的70%。结论低应力结构设计能够更有效地降低作用在内装物上的应力,在静态压缩与动态冲击实验中有更好的保护功能,且低应力模体结构在生产中设计增大了拔模斜度,有利于增加制品生产过程中的良品率,为纤维模制品的设计与应用提供了重要参考依据。
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 3200 N,25%higher than the 2800 N load of the low-stress structure.The energy absorbed was 14000 J for the traditional and 15000 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.
作者
刘海
张典飞
黄利强
LIU Hai;ZHANG Dianfei;HUANG Liqiang(School of Light Industry Science and Engineering,Tianjin University of Science&Technology,Tianjin 300222,China)
出处
《包装工程》
北大核心
2025年第15期86-92,共7页
Packaging Engineering
基金
国家重点研发计划(2022YFD2100402)。
关键词
纤维模制品
结构变化
拔模斜度
模体性能测试
fiber molding
structural changes
draft angle
mold performance testing
