【作者】 张健；

【导师】 李琛； 韩雪山；

【作者基本信息】 东北林业大学 ， 轻工技术与工程（专业学位）， 2022， 硕士

【摘要】 柱状充气缓冲衬垫是一种由塑料薄膜制成的全透明环保缓冲材料,在各领域得到了广泛的应用。而与广泛应用不符的是,柱状充气缓冲衬垫的使用还不够成熟,其设计方法及参数选择均处于经验及模仿阶段。本文对柱状充气缓冲衬垫的缓冲防护性能进行研究,针对于小型易碎品,以E27型螺旋式节能灯为被包装物,通过薄膜基本性能试验、理论分析、跌落试验、跌落仿真分析,研究初始充气压力、薄膜厚度、跌落高度对柱状充气缓冲衬垫的性能影响,同时以其他缓冲材料为对照组,进行跌落试验及跌落仿真,对加速度峰值、能量吸收能力、缓冲作用时间等参数进行分析,最后建立综合评价体系,为柱状充气缓冲衬垫的进一步标准化使用提供理论依据。首先,对柱状充气缓冲衬垫的结构特点进行分析,了解其基本运作方式。选择不同厚度的衬垫基材薄膜进行薄膜性能测试及封合强度测试,得出该类材料的超弹性特点及各部分封合强度关系。基于理想状态下空气热力学原理,分析了柱状充气缓冲衬垫的刚性特点,确立了影响柱状充气缓冲衬垫性能的因素,得出初始充气压力及薄膜对刚性的影响,过大的初始充气压力会提升衬垫的刚度,薄膜的应力-应变情况也会间接改变刚性,以此为后续研究奠定了基础。通过对50μm、55μm、60μm、65μm、70μm薄膜厚度的柱状充气缓冲衬垫施以20kPa、30 kPa、40kPa、50kPa的初始充气压力,将其作为E27型螺旋式节能灯的外包装进行40 cm、60 cm、80 cm高度下的跌落试验,并以EPE、EPS、瓦楞纸板为对比组。依据具体防护效果及加速度峰值分析得出,各种柱状充气缓冲衬垫均满足防护需求,以55μm-40 kPa的柱状充气缓冲衬垫在各个跌落高度下表现出的性能最优,气压选择30-40 kPa之间为宜,薄膜厚度对于性能的影响依赖其应变率,使用时可结合初始充气压力选择,且大部分柱状充气缓冲衬垫组合性能优于其他三种材料。结合刚度理论得出,适当的增加初始充气压力可有效的提升衬垫的缓冲性能,降低内部产品承受的首次冲击载荷。最后,在跌落试验基础上,针对于55μm的柱状充气缓冲衬垫在80 cm高度下进行跌落仿真分析,得出降低初始充气压力可提升缓冲作用时间,其中20 kPa表现出最优的缓冲作用时间;适当的增大初始充气压力可有效降低产品承受的冲击载荷,40 kPa下节能灯承受的最大应力为23.4MPa低于其他三个气压。不同初始充气压力衬垫的能量吸收比重依次为(20 kPa-50 kPa):78.1%、80.46%、86.08%、84.8%,其他三种材料的能量吸收比重为:EPE(80.49%)、EPS(74.9%)、瓦楞纸板(23.57%),得出一定范围内提升初始充气压力可有效的提升衬垫的能量吸收能力,而柱状充气缓冲衬垫的能量吸收能力及缓冲作用时间普遍优于其他材料。并利用评价体系综合评估了柱状充气缓冲衬垫的良好性能。更多还原

【Abstract】 A cylindrical inflatable cushion liner is a fully transparent environment protection cushion material made of plastic film,which has been widely used in various fields.What is inconsistent with the wide application is that the use of the cylindrical inflatable cushion is not mature enough,and its design method and parameter selection are in the stage of experience and imitation.In this paper,the cushioning protection performance of cylindrical inflatable cushion liner is studied.For small fragile products,E27 spiral energy-saving lamp is used as the package.Through film basic performance test,theoretical analysis,drop test and drop simulation analysis,the effects of initial inflation pressure,thin film thickness and drop height on the performance of cylindrical inflatable cushion liner are studied.At the same time,other cushion materials are used as the control group for drop test and drop simulation,The parameters such as peak acceleration,energy absorption capacity and buffer action time are analyzed.Finally,a comprehensive evaluation system is established to provide a theoretical basis for the further standardized use of cylindrical inflatable cushion.Firstly,the structural characteristics of cylindrical inflatable cushion are analyzed,and its basic operation mode is understood.The film properties and sealing strength of liner substrate films with different thickness are tested,and the hyperelastic characteristics and sealing strength relationship of these materials are obtained.Based on the principle of air thermodynamics in the ideal state,the rigid characteristics of the cylindrical inflatable cushion are analyzed,the factors affecting the performance of the cylindrical inflatable cushion are established,and the effects of the initial inflation pressure and the film on the rigidity are obtained.Excessive initial inflation pressure will increase the stiffness of the cushion,and the stress-strain of the film will indirectly change the rigidity,this laid the foundation for the follow-up research.Select a film thickness of 50μm、55μm、60μm、65μm、70 μm cylindrical inflatable cushion,and apply initial inflation pressures of 20 kPa,30 kPa,40 kPa and 50 kPa to it,as the outer package of E27 spiral energy-saving lamp,the drop test was carried out at the height of 40 cm,60 cm and 80 cm,and EPE,EPS and corrugated board were used as the control group.According to the analysis of specific protection effect and acceleration peak value,various cylindrical inflatable cushion liners meet the protection requirements.The cylindrical inflatable cushion with 55 μm-40 kPa shows the best performance at each drop height,and the air pressure is between 30-40 kPa.The effect of film thickness on performance depends on its strain rate,which can be selected in combination with the initial inflation pressure,and the combined performance of most cylindrical inflation cushion liners is better than the other three materials.Combined with the stiffness theory,it is concluded that appropriately increasing the initial inflation pressure can effectively improve the cushioning performance of the liner and reduce the first impact load borne by the internal products.Finally,based on the drop test,the drop simulation analysis of 55 μm cylindrical inflatable cushion at the height of 80 cm is carried out.It is concluded that reducing the initial inflation pressure can increase the buffer action time,of which 20 kPa shows the optimal buffer action time;Appropriately increasing the initial inflation pressure can effectively reduce the impact load borne by the product.The maximum stress borne by the energy-saving lamp under 40 kPa is 23.4 MPa,lower than the other three air pressures.The energy absorption specific gravity of the liner with different initial inflation pressure is(20 kPa-50 kPa):78.1%,80.46%,86.08%and 84.8%.The energy absorption specific gravity of the other three materials is:EPE(80.49%),EPS(74.9%)and corrugated board(23.57%).It is concluded that increasing the initial inflation pressure within a certain range can effectively improve the energy absorption capacity of the liner,The energy absorption capacity and a cushioning time of cylindrical inflatable cushion are generally better than other materials.The evaluation system is used to comprehensively evaluate the good performance of the cylindrical inflatable cushion liner.更多还原