Shanghai Daoqin Plastics Co., Ltd.

polymer foam plastics force property can main/primary 由基体 polymer property 质, polymer ratio (or foam plastics density) and structure property 质决定. is 说, foam plastics density is very important factors. foam plastics density and foaming has 直接 关系. through types different density EPS材 material 静, pressure shrink experiment/testing data, use foaming plastics can amount absorption research formed 果, this material mono toward pressure shrink property can and density selection in packaging design in application. this research will is combined selection packaging materials density provide 一定 理论 based on. 1 foam plastics property can and its can amount absorption property foam plastics property 质, most 早由Woolam进行 research, 他提出 use amount parameters can amount absorption methods, Miltz and other 由准静态 pressure shrink 实验曲线 forecast foam plastics property 质. 他们提出 use has property parameters table/sheet pressure shrink foam plastics can amount absorption rate, Yossifon and other amount versus parameters simple 数学模 type, soft foam in impact conditions lower property 质. foam plastics can amount absorption issues, Rusch relatively 早进行 research, 并提出 can use 3 无 amount amount 描述材 material can features. Schwaber提出 如 lower understanding: foam plastics deformation process in can amount loss consumption 包括由基体 deformation generate can amount loss consumption, mono 元间(ratio 如支柱) scratch generate can amount loss consumption, foam plastics in viscous property flow generate can amount loss consumption (gas retardant 尼)闭孔 structure in gas 体 不 can pressure shrink generate can amount loss consumption. Kurauchi and other research hard polyurethane ester foam plastics in pressure shrink lower can amount absorption issues, Maiti and other also 提出 构造 can amount absorption methods, can amount absorption table/sheet certain density scope/range inner mono 位体积 foam plastics absorption can amount and value force 关系. if selection loss force, that can amount absorption will to ultra- 峰 value force absorption most large can amount foam plastics density Avalle and Belingardi and other EPP, PUR, EPS and other foam plastics can amount absorption property, 并绘出 versus can amount -应 force 图. upper 述, currently for/regarding engineering use foam plastics, especially is high density polyurethane ester foam plastics and packaging use foam plastics research large in in for its force -应变关系 描述 and impact elastic property can analysis. very less 专门考虑材 material density for its property can effect/influence and this type of effect/influence for/regarding packaging 缓冲材 material selection 意义. from experiment/testing degree different density material can amount absorption property, meanwhile is based on 指导材 material density selection. 2 foam plastics mono toward pressure shrink experiment/testing and its analysis separation through 静态, pressure shrink experiment/testing different density material force -应变曲线 or accelerated degree - time 曲线, analysis material pressure shrink property can and material for pressure shrink, impact can amount absorption property can. 2.1 experiment/testing sample made and 处理 实验选取 new 航(苏州) foaming plastics has company production types different density (0, 020g/cm3, 0．022g/cm3, 0．027g/cm3 and 0．050g/cm3) EPS foaming plastics as is 实验材 material, Sample dimensions specifications is 100mm X l00mm X 35mm. 考虑实际流通 ring 境情况, in 23℃, versus for temperature degree 50％ conditions lower for has sample 进行24 h temperature wet degree 预处理. separation in standards ring in 进行准静态 pressure shrink and impact pressure shrink experiment/testing. 2.2 材 material pressure shrink experiment/testing and analysis using/adopting light industrial packaging products quality testing in LRXPlus electrical material experiment/testing machine and its data analysis system, in standards experiment/testing ring in, for material most large amount is 90％ 准静态 mono toward pressure shrink experiment/testing, to material force -应变曲线见图1. 图 1: different density EPS pressure shrink using/adopting DY-2 type experiment/testing machine, in standards ring conditions lower, 以60cm high degree for Sample impact pressure shrink experiment/testing, to material pressure shrink accelerated degree - time 关系曲线(见图2). from 图1 can 看出: 1)EPS foam plastics belongs to di positive type elastic property material. in small 应变情况 lower, material performance relatively good elastic property; 随 载荷 increase material elastic property 屈曲, rear 曲线呈现出 relatively long slip stage/phase, 说明材 material relatively large property deformation, force 随应变 increase growth slow, large separation pressure shrink can amount by material absorption or consumption dispersion. positive is material in stage/phase large deformation absorption outer to can amount (pressure shrink, or impact). 随 应变 amount increase, material structure by bad, for can amount absorption decrease small, material 传递 应 force 也开始急剧 upper rise. 2) different density Sample has different pressure shrink property can, usually density high material in elastic property deformation stage/phase has relatively large elastic property 系数, meanwhile 屈服应 force relatively large, material pressure strong/high stage/phase relatively 早. 反映出由 density 决定 材 material structure for overall pressure shrink property can effect/influence. 图 2: different density EPS impact pressure shrink G－t曲线同样, impact pressure shrink 图线也反映出 材 material property can 差异, density large, material structure 越紧密, elastic property large, to product upper accelerated degree (force)也 growth relatively fast, value large, impact time versus decrease/reduce. 3 EPS材 material pressure shrink can amount absorption property 3.1 EPS准静态 pressure shrink lower can amount absorption amount material property can important indicators is material for impact, pressure shrink can amount absorption or consumption dispersion, generally 以一定应 force lower material absorption most large can amount or material for can amount absorption efficiency table/sheet 示. 图 3: different density EPS pressure can amount absorption －应 force 曲线图3反映 different density foaming polystyrene (PS) in pressure shrink conditions lower can amount absorption property, 图3 table/sheet different density foaming polystyrene (PS) in pressure shrink conditions lower can amount absorption efficiency. can different density material tool has different can amount absorption efficiency, different density material in different force lower can efficiency large small 关系也会 different, 如图3 示: in force is δ1时, efficiency large small is E0.020>E0．022>E.027>E0.050; in force is δ2时, efficiency large small is E0.027>E0.022>E0.020>E0.050; in δ>δ2时, density is 0.050g／cm3 EPS efficiency has upper rise, therefore material selection key/critical in for 特定应 force conditions lower efficiency density trend 握. 图 4: EPS材 material impact process in force － deformation due to impact pressure shrink usually to is heavy accelerated degree - time 关系曲线, 并不直接反映材 material pressure shrink 情况, therefore need for G―t曲线进行 versus 应 数 value and 转换, to material in pressure shrink 时 受 force, deformation 情况见图4. 图5 示 is density is 0.0202／cm3 EPS foaming plastics in 5 kg, 60cm high degree impact G―t曲线转换计算结果. 同样, can to material in 一定应 force lower can amount absorption and can amount absorption efficiency 曲线. 图 5: impact pressure shrink lower EPS材 material can amount absorption 情况4 讨论 in packaging design in, requirements 缓冲材 material can can more absorption impact can amount, is 说, requirements in product force value 一定 情况 lower, 缓冲材 material absorption can amount more good, or 者说材 material for can amount absorption efficiency high good. can utilizing different density material can amount absorption efficiency -应 force 曲线 指导材 material selection. utilizing different density EPS can amount absorption efficiency E－δ曲线 can to 一定应 force lower density and can amount absorption efficiency 关系(见图6 right), 该图反映 一定应 force lower different density material for can amount absorption can force. can 发现材 material can amount absorption property and material density large is material 线关系, in certain density material can amount absorption efficiency to most high, in packaging design in density value is currently force lower material selection material most density value. from value left, material density low, can force low, in pressure shrink or impact 时越容 easy by pressure 实, its can amount absorption efficiency low; right density increase large, material elastic property small, elastic property 屈服极限也 increase large, property deformation decrease small, material 呈现出越 越 strong/high rigid property 碰撞特征. due to impact can amount consumption dispersion main/primary is property deformation 引起, therefore for 特定应 force water lower 特定材 material E－δ曲线, its has has 唯一极 value 点. value is currently force water lower material most density value. 图 6: can amount absorption rate E and material density 关系例如当 by packaging product use force is a时, density is 0.023g／cm3 EPS tool has most good can amount absorption property. therefore according to can efficiency most high can use EPS most combined density value is 0.023g／cm3. 同样, by packaging product use force water is δ1 or δ2时也 can its for E-t曲线图(similar 于图7 right), versus 应曲线 most high for density value is for force conditions lower material most density value. in product force water 平确定以 rear (由 product quality, value, has 效缓冲接触面积决定), most material density 由图8确定, meanwhile also can to density material can amount absorption efficiency 确切数 value, value can to material in force lower 缓冲系数C（缓冲系数C二1／E）, can very 方便计算出缓冲 structure most small thick degree. from material density and can amount design product relatively design methods more 方便, more combined design requirements. 5 结束语 density is foaming material important property, it for material property can has very large effect/influence. in focus/key point EPS材 material density for its can small absorption efficiency effect/influence, utilizing material E－t曲线 design product packaging 途径, has 助于缓冲 packaging design 科学化 and 精确化. meanwhile, foaming material density also and its foaming rate related, from production application 讲, 掌握材 material density and can amount absorption efficiency 关系也 has for material property can assessment, has 目 进行材 material production and its process process adjustment.