压痕形状对瓦楞纸箱抗压强度影响的试验

目的 在不同形状的压痕条件下,对瓦楞纸箱进行抗压试验,研究纸箱的变形情况和抗压能力。方法 首先设计无压痕纸箱、一字型压痕箱、八字型压痕箱以及菱形压痕箱;其次将各种压痕形状下的纸箱,利用纸箱抗压试验机进行空箱抗压实验,记录各自的最大压溃力;最后对实验数据进行分析,明确抗压强度与压痕形状的关系。结果 不同压痕形状对瓦楞纸箱的抗压强度有不同程度的影响,其中菱形影响最大。菱形压痕通过阻碍纸箱变形趋势可提高瓦楞纸箱的抗压强度。结论 在瓦楞纸箱侧板上通过施加阻碍纸箱工字型变形的压痕（如菱形压痕）,可以增加瓦楞纸箱的抗压强度,对瓦楞纸箱的生产设计具有参考意义。     

牙膏纸箱堆码抗压可靠性设计初探

模拟牙膏纸箱实际堆码进行长时间抗压试验，获得纸箱压溃临界蠕变变形量，采用数理统计方法确定了该种纸箱压溃临界蠕变变形量的概率分布及其数字特征，提出了牙膏纸箱堆码抗压可靠性设计参数。     

瓦楞纸箱堆码性能分析

以平齐堆码的瓦楞纸箱为对象,针对不同的存储周期,研究了堆码时间对瓦楞纸箱堆码强度的影响。运用静载荷堆码试验方法,研究了堆码时间与底层瓦楞纸箱变形量的关系,通过回归分析得到了关系方程,确定了堆码时间较长的纸箱的变形量的预测方法。研究了平齐堆码瓦楞纸箱承载耐久时间与固定载荷的关系,并绘制了其关系曲线,通过回归分析得到了瓦楞纸箱压溃时间的公式。     

大长宽比对纸箱抗压能力影响的研究与分析

对获取纸箱抗压能力的3种主要技术手段:试验测试方法、经典公式计算方法和计算机仿真模拟方法的优缺点进行了对比分析。选择0201型BC楞瓦楞纸箱为对象,分别采取试验测试和经典公式计算,在纸板材料、纸箱高度、周长相同的条件下,对长宽比从1～3范围变化的纸箱抗压能力进行了计算和测试。结果表明:长宽比从1变化到3时,纸箱的抗压强度先升再降;当长宽比为1.6左右时,抗压强度达到最大值。试验结果和利用经典抗压能力计算结果的对比分析表明,计算结果均较大地偏离了试验结果。由于不能充分考虑到纸板加工质量、纸箱成型工艺、温湿度及其它因素的影响,经典抗压能力计算公式均是偏保守的。     

基于极限抗压能力的瓦楞纸箱抗压强度可靠性分析

以牛奶包装用0201型C楞三层瓦楞纸箱为例,通过试验数据分析各个设计变量的统计特征;以纸箱承载达到其极限抗压能力为主要失效模式,建立了瓦楞纸箱抗压强度可靠性分析方法;通过敏感性分析定量评估了各个设计变量对瓦楞纸箱抗压能力的影响程度;计算了随机安全系数的变动范围,指出现行的强度设计方法是偏于安全的.     

免胶带可自锁的瓦楞纸箱结构设计

目的 针对现有快递包装普遍使用胶带封箱及生命周期短等问题,提出一种免胶带封箱可自锁且可多次使用的新型瓦楞纸箱设计方案.方法 首先确定包装材料;接着进行创新性包装结构设计,重点设计免胶带封箱及自锁结构的可靠性;在此基础上确定纸箱多次使用的工艺流程;最后利用验证试验及有限元仿真对纸箱进行性能分析.结果 自由跌落试验结果表明提案纸箱在多次使用过程中具有良好的封箱强度;跌落仿真结果表明提案纸箱可吸收约40％的外部冲击载荷,具有良好的缓冲性能;空箱抗压仿真可知提案纸箱的最大抗压强度为3236 N,较普通开槽箱抗压性能提升约42％.另外,提案纸箱较普通开槽箱可降低约60％的生产成本.结论 提案纸箱具有免胶带封箱、自锁防盗启、生命周期长、保护性能好、生产成本低等优点.     

非均布载荷下瓦楞纸箱的承载性能

目的研究非均布载荷下瓦楞纸箱变形与抗压强度的变化规律。方法对2种不同类型的纸箱进行局部抗压试验。首先对纸箱的不同箱面位置进行局部抗压试验,然后对纸箱的同一箱面位置进行变加载面积的抗压试验,最后分析试验数据。结果在确定加载面积的情况下,纸箱中心位置抗压强度最差,周边位置抗压强度最高;对于长方形纸箱面,其短边位置的抗压强度大于长边位置的抗压强度。在确定纸箱加载位置的情况下,加载面积越大,纸箱抗压强度越大;随着加载面积的增大,纸箱的抗压强度呈指数型增加。结论非均布载荷对纸箱抗压强度影响较大。当纸箱箱面中部承受非均布载荷时,纸箱垂直方向上会产生较大的变形,因此在瓦楞纸箱的转运过程中应尽量避免承受因局部或交错堆码产生的非均布载荷。     

基于ANSYS Workbench 的瓦楞纸箱抗压性能仿真研究

建立了瓦楞纸箱的有限元模型并进行了结构修正,应用ANSYS Workbench有限元分析软件对纸箱结构模型进行了屈曲分析,从而求得了瓦楞纸箱的抗压强度,最后通过抗压试验进行了验证。有限元分析结果与试验结果比较接近,验证了模型的有效性。     

低温瓦楞纸箱抗压性能试验方法研究

针对冷链运输包装对瓦楞纸箱的耐低温要求,通过对多家纸箱使用企业和生产企业的走访调查和试样采集,在深入研究分析普通瓦楞纸箱抗压性能试验方法的基础上,根据冷链运输物品的仓储、倒库实际状况对瓦楞纸箱抗压性能的要求,对低温包装瓦楞纸箱的抗压性能指标进行了试验方法论证,提出了适合冷链运输包装用低温瓦楞纸箱的抗压性能指标检测方法。     

高强度冷冻防潮瓦楞纸箱研制

目的利用新型经纬线纸研制高强度冷冻防潮瓦楞纸箱,以适应冷链食品低温贮藏、运输的物流环境。方法实验测试经纬线纸包装特性,确定其适合瓦楞纸板的组分;应用Ansys分析软件,建立经纬线瓦楞纸箱和普通瓦楞纸箱的有限元模型,模拟实际流通环境对纸箱模型施加载荷,求出2种瓦楞纸箱的抗压强度;进行空箱抗压实验,比较2种方法下经纬线纸箱与普通纸箱的抗压强度大小。结果用预应力经纬线纸作为瓦楞纸箱的面纸,在低温流通环境中其空箱抗压强度比相同芯纸和里纸的普通瓦楞纸箱高约30%,并且经纬线纸纸箱的质量比普通瓦楞纸箱的质量低12%。结论在实际生产中,可以利用经纬线纸制造高强度的低温防潮箱,以适应冷链流通环境,也可以制作低克重高强度纸箱,以节约纸箱用纸量。     

An analysis of the influence of hand hole and ventilation hole design on compressive strength of corrugated fiberboard boxes by an artificial neural network model

This research aimed at developing a high-performing corrugated fiberboard box compression strength prediction model and to analyze the influences of ventilation and hand hole designs for these containers on the box compression test (BCT) by applying artificial neural network (ANN) modeling. The input variables considered in this study are composed of nine parameters including box dimension as well as shapes, sizes, positions, and locations of ventilations and hand holes of a regular slotted container (RSC, FEFCO 0201). Back propagation algorithms (BPNs) of ANN models were developed from 970 BCT testing data points (single wall boards, C flute, 205/112/205 g/m²). Tested data was randomly broken into three groups for the model development as 80:10:10 for the training set, testing set, and validating set. According to the analysis performed, a BPN 9-13-1 model reflected the highest prediction performance with R² = 0.97. According to the analysis, BCT was significantly affected by the hand hole location followed by the geometrical dimensions of the box (height, length, and width) and the ventilation factors (shape, number, and location) in that order. Hand holes at the top flaps caused a lower BCT reduction compared with those at the vertical locations of the box. Slight changes to the eliminated board area for both hand holes and ventilation (±5%) contributed to less BCT reduction compared with its locations and shapes. Interestingly, increasing the box height significantly increased the BCT, and this was found to be limited only to shorter boxes fabricated from a high stiffness corrugated board.     

Estimation of the compression strength of corrugated fibreboard boxes and its application to box design using a personal computer

Many papers have been published on the compression strength of corrugated fibreboard boxes, using such formulae as Kellicut's equation and McKee's equation for the calculation. These equations, however, require known values of the strength of linerboard or corrugated fibreboard, they do not include the influence of moisture content and they are inadequate in the case of wrap-around boxes. The present author measured the mechanical properties of a large number of fibreboard boxes, and has derived a statistical formula useful for estimating the compression strength of a box based on its specifications — grade of corrugated fibreboard, size of box, type of box, printed area and moisture content. The calculation gives fairly good agreement with experimental results. The estimation technique has further been converted into a personal computer program, which renders the design of corrugated fibreboard boxes an easier task.     

瓦楞纸箱抗压强度的研究进展

目的综述国内外对瓦楞纸箱抗压强度的研究进展,探讨瓦楞纸箱的发展趋势。方法以查阅文献等形式,了解国内外瓦楞纸箱抗压强度的研究现状。论述对瓦楞纸箱力学性能的研究,讨论抗压强度经验公式的修订、抗压强度影响因素及提高方法。结论抗压强度的研究为瓦楞纸箱生产企业和包装设计者提供了必要的实验数据。轻量化、定量化、节约资源和降低成本等是瓦楞纸箱科学发展的要求,也为全球瓦楞纸箱的发展指明了方向。     

The effect of pallet top deck stiffness on the compression strength of asymmetrically supported corrugated boxes

During unitized shipment, the components of unit loads are interacting with each other. During floor stacking of unit loads, the load on the top of the pallet causes the top deck of the pallet to bend, which creates an uneven top deck surface resulting in uneven or asymmetrical support of the corrugated boxes. This asymmetrical support could significantly affect the strength of the corrugated boxes, and it depends on the top deck stiffness of the pallet. This study is aimed at investigating how the variations of pallet top deck stiffness and the resulting asymmetric support affect corrugated box compression strength. The study used a scaled-down unit load compression test on quarter-scale pallet designs with different deckboard thicknesses using four different corrugated box designs. Pallet top deck stiffness was determined to have a significant effect on box compression strength. There was a 27%–37% increase in box compression strength for boxes supported by high-stiffness pallets in comparison with low-stiffness pallets. The fact that boxes were weaker on low-stiffness pallets could be explained by the uneven pressure distribution between the pallet deck and bottom layer of boxes. Pressure data showed that a higher percentage of total pressure was located under the box sidewalls that were supported on the outside stringers of low-stiffness pallets in comparison with high-stiffness pallets. This was disproportionately loading one side of the box. Utilizing the effects of pallet top deck stiffness on box compression performance, a unit load cost analysis is presented showing that a stiffer pallet can be used to carry boxes with less board material; hence, it can reduce the total unit load packaging cost.     

温湿度及纸箱尺寸对堆码强度影响的实验研究

考虑远洋运输及全球气候变化,进行了纸箱堆码强度实验.重点考虑温度、湿度、尺寸对堆码强度的影响.根据国家标准,设计了4种箱型,每种箱型共取33个实验点,每点3个纸箱,环境处理5h.实验结果表明:湿度是强度的最大影响因素,尺寸次之,温度影响不明显.按单位面积的压溃力进行纸箱强度相对比较,比较过程合理.从这个角度讲,小纸箱承载能力要高.将堆码强度作为约束引入到Up Side Up 箱型的装填布局,提出了承载能力准则.     

冷冻食品包装用瓦楞纸箱结构设计研究

根据冷冻食品用瓦楞纸箱在冷库中易出现的塌箱现象,介绍了塌箱原因。从瓦楞纸箱结构设计的角度,研究了提高瓦楞纸箱抗压强度的方法。实验数据分析表明:按照纸板理论边压强度的1.25倍进行配纸,所得到的瓦楞纸板抗压强度可满足储运环境要求;此外,将常用02型箱型改为套合型箱型,也可明显提高纸箱的抗压强度。     

瓦楞纸箱提手孔形状对抗压强度的影响

对同一规格、不同手孔形状的重型装饰灯具外包装瓦楞纸箱的抗压强度进行了试验,以探讨提手孔形状对纸箱抗压强度的影响。在提手孔形状满足舒适度的前提下,对5 种形状的提手孔进行了试验。试验结果表明,针对瓦楞纸箱抗压强度损失而言,弧形提手孔强度损失最少,梯形提手孔最大,跑道形、山形和半圆形提手孔对纸箱抗压强度的影响程度相差不大。     

瓦楞纸箱的有限元建模及屈曲分析

建立了瓦楞纸箱的有限元模型并进行了屈曲分析,计算了该瓦楞纸箱的临界载荷和屈曲模态.将临界载荷与利用凯利卡特公式计算的抗压强度进行了对比.分析结果表明,利用有限元的方法计算的瓦楞纸箱临界屈曲载荷与凯利卡特公式计算抗压强度非常接近.因此利用屈曲分析计算瓦楞纸箱的抗压强度是一种可行的方法.