蠕变对发泡聚乙烯缓冲性能影响的研究  

Effects of Cushion Property of Foamed Polyethylene EPE Cushioning Material Exerted by the Creep

作　　者：刘继飞[1] 韩雪山[2] 王伟[2] 葛杰[1] 

机构地区：[1]天津科技大学,天津300222 [2]中国包装科研测试中心,天津300457

出　　处：《包装工程》2014年第3期48-51,63,共5页Packaging Engineering

摘　　要：目的研究发泡聚乙烯(EPE)缓冲衬垫在受到内装产品长期静态压载后的缓冲特性变化规律。方法设定2个不同负载(15.3,22.2 kg)模拟某一类电子产品自重,并设置对照组,预载时间为72 h,进行静、动态缓冲特性实验,对比分析EPE产生不同程度的永久变形后,在不同预载量下的应力-应变曲线、最大加速度-静应力曲线及缓冲系数-最大应力曲线。结果预载使EPE静压的屈服阶段变短,吸能特性降低,最小加速度增大,最小缓冲系数增大。结论蠕变会显著降低EPE的缓冲性能,在对发泡材料进行缓冲特性研究时,应增加对材料初始形态的预处理,使其更加符合实际使用状况。Objective To analyze the changing characteristics of foamed polyethylene EPE cushion after a long time of product loading. Methods Two different load weights （ -15.3, 22.2 kg） were set to simulate the weight of certain electronic product in this controlled study, with a preloading of 72 h, and the deformation of the internal buffer material after long time stacking compression was checked. Then the stress-strain curves, the maximum acceleration-static stress curves and cushion coefficient-maximum static stress curves under two different pre-loading weights were compared. Results Preloading could shorten the yield segments, decrease the property of energy-absorbing, and increase the minimal acceleration values and minimal cushion coefficient values. Conclusion Preloading could greatly weaken the cushioning performance of EPE buffer material. It is recommended that pre-conditioning should be done prior to the dynamic test for expanded materials, therefore it could better resemble the actual using condition.

关 键 词：EPE 蠕变 永久变形 最大加速度 缓冲系数 

分 类 号：TB485.1[一般工业技术—包装工程] TB487