【作者】 王军；

【导师】 卢立新；

【作者基本信息】 江南大学 ， 包装工程， 2011， 硕士

【摘要】 蜂窝纸板作为一种结构新颖、承载性能好、重量轻且具有良好缓冲性能的绿色包装材料受到工业界特别是包装界的广泛关注,并已应用于包装、建筑、农业等诸多领域。目前,蜂窝纸板在产品防护包装设计中应用越来越广泛,研究其承载及缓冲性能具有重要的现实意义和工程价值。本论文课题首先对蜂窝原纸的固体模量和屈服强度进行测试,并建立与环境相对湿度的关系,这是本课题的试验基础,也是构建理论模型参数的关键。因为蜂窝原纸性能为各向异性,且其纵向固体模量和屈服强度均大于横向,实际中常将纵向作为承载方向,本文所研究内容均为蜂窝原纸及蜂窝纸板的纵向性能。蜂窝纸板的面内性能与面外性能有很大差异,本文从两个方面都进行了研究。主要研究成果如下:(1)建立了考虑相对湿度的蜂窝纸板面内平台应力模型,并与试验数据进行比较验证。结果表明,纸板厚度和面层性能对蜂窝纸板面内平台应力有较大影响,芯层性能对其影响较小;所建立模型能较准确地反映环境相对湿度对纸蜂窝结构材料面内平台应力的影响。借助该模型,无需大量的试验,即可估算其考虑相对湿度的面内平台应力,为蜂窝纸板的配纸和合理选用提供理论依据。(2)研究了不同厚度、不同芯层、不同面层对蜂窝纸板面内能量吸收性能的影响,构建其理论能量吸收图,并与试验数据进行比较验证。结果表明,厚度和面层性能对蜂窝纸板面内单位体积吸收能有较大影响,芯层性能对其影响较小;建立的模型能较准确地反映蜂窝纸板面内能量吸收性能。(3)建立基于环境相对湿度影响的蜂窝纸板面外平台应力模型,并与试验实测数据进行比较验证。结果表明,建立的模型能较准确地反映环境相对湿度对纸蜂窝结构材料平台应力的影响。(4)根据不同厚跨比蜂窝纸板在不同湿度条件下的动静态压缩缓冲曲线,通过计算机编程建模,利用MATLAB程序构建含应变速率、蜂窝结构及环境湿度等信息的动静态压缩能量吸收图。结果表明,随厚跨比的增大,蜂窝纸板最佳能量吸收点向右上方偏移,其单位体积吸收能量的能力增强;随着相对湿度的增大,蜂窝纸板最佳能量吸收点向左下方偏移,其单位体积吸收能量的能力减弱。(5)研究了低中应变率下蜂窝纸板的面外承载及能量吸收性能。结果表明,随应变率的增大,其承载及能量吸收特性均随之增大,且中应变率时的能量吸收性能大于低应变率的能量吸收。更多还原

【Abstract】 Due to its novel structure, light weight, favorable bearing performance and environmental friendliness, honeycomb paperboard has been widely used in the field of packaging and others such as architecture and agriculture industry. Firstly, the solid modulus and yield strength of honeycomb paper were tested considering the effect of relative humidity, which was experimental and theoretical foundation for the paper. Due to the anisotropic for honeycomb paper and the longitudinal strength is bigger than transverse strength for paper-class materials, longitudinal direction is often used as the in-plane bearing direction. In this paper, the studies are all about the longitudinal properties of honeycomb paper.The properties of honeycomb paperboards are very different between the in-plane direction and the out-plane direction, on both aspects the paper were studied. The research work mainly included as follow:(1)The in-plane plateau stress model of honeycomb paperboard considering the effect of relative humidity was established, which was compared with the experimental data. The results show that the thickness and liners of honeycomb paperboard have great influence on the in-plane plateau stress, on which the core layers has little influence, The model can accurately reflects the influence of relative humidity conditions on the plateau stress of paper honeycombs. With this model, the in-plane plateau stress considering humidity conditions can be estimated without experiments, and the proposed method can be used to provide theory basis for the paper constitution and reasonable selection of honeycomb paperboards.(2)The effects of thicknesses, core layers and liners on the in-plane energy absorption performance of honeycomb paperboard were observed under standard conditions in this paper. The theoretical energy-absorption diagrams were molded and constructed by computer, which was compared with the experimental data. The results show that the thickness of honeycomb paperboard and the liners have a great effect on its in-plane energy absorption performance, the core layers of honeycomb paperboard hasn’t obvious effect on its in-plane energy absorption. The model can accurately reflect the energy absorption performance of honeycomb paperboard.(3) The out-plane plateau stress model of honeycomb cardboard considering the effects of relative humidity was established and compared with the experimental data.(4) Based on cushioning curves of honeycomb paperboards under static and dynamic compression with different thickness-to-length ratios under different relative humidity conditions, the energy-absorption diagrams are molded and constructed by computer, including strain rates, honeycomb structures and relative humidity conditions.(5)The bearing and energy absorption performance for honeycomb paperboards based on the influence of strain rate were studied in this paper.更多还原