双螺杆强制润滑挤出UHMWPE板材的研究

通过引入强制润滑成型原理．研制了UHMWPE强制润滑挤出成型装置，采用同向旋转双螺杆挤出机实施了对UHMWPE板材的连续挤出成型实验研究，对螺杆组合方式进行了优化对比，确定了合理的螺杆组合构型，并对挤出实验中出现的异常现象进行了剖析。研究工作表明，采用对机头流道的强制润滑、合理的螺杆组合、正确的工艺条件和机头流动压力的调整，可以成功实现对UHMWPE体系的连续高效挤出成型。     

WC-10Co纳米复合粉末棒材的成型工艺研究

研究了WC-10Co纳米复合粉末的模压、挤压成型及冷等静压复压工艺.用SEM观察了生坯的显微结构.结果表明:运用本研究优化的模压、挤压工艺能生产出合格的棒坯;模压成型后的冷等静压处理工艺可以减少坯体孔隙度,提高其强度,但冷等静压处理工艺对挤压成型的坯体的后期效果并不明显.     

精密陶瓷凝胶注模成型工艺评述

陶瓷的成型和加工问题一直是困扰无机陶瓷材料应用的主要技术难点，也是陶瓷材料研究最为重要的课题之一。上世纪九十年代初发展起来的凝胶注模成型工艺，是一种近净尺寸陶瓷成型技术，它为解决陶瓷材料的加工成型问题提供了一条有效的工艺途径。本文简要介绍了陶瓷凝胶注模工艺和陶瓷浆料的基本组成，讨论了影响聚合反应速率、浆料流变性和陶瓷坯体性能的多种因素，并对陶瓷凝胶注模成型工艺的最新进展给予了评述。     

瓦楞纸箱后成型工艺对其质量的影响

对瓦楞纸板后成型工艺进行研究。研究取样、实验,分析纸板后成型工艺中的堆放,存储,印刷,开槽,压痕等因素对瓦楞纸箱抗压强度等质量参数的影响,并提出了几点方案,对实际的瓦楞纸箱生产具有一定的参考价值。     

基于人因学原理的一板成型纸包装结构设计

一板成型结构可最大限度地节省材料并简化纸板组装加工程序,生产效率较高,同时不需胶粘,绿色环保,具有较好的市场发展前景。借鉴成功的设计案例,对普通PC硬盘包装进行了纵向结构延伸和纵、横双向结构延伸的改进设计;另外,还设计了具有销售和展示双重功能的一板成型的纸包装结构。     

用有限元法计算飞秒激光双光子成型点弹性模量

采用有限元法对材料为SCR500的飞秒激光双光子成型点力学性能进行建模及仿真计算，得出了不同弹性模量下成型点与探针之间的作用力．进而利用原子力显微镜接触模式，选用无针尖探针，测量了成型点的力学性能，得出了相同位移载荷下成型点与探针之间的作用力．将测量结果和仿真结果进行比较，推算出成型点的弹性模量．分析结果表明。双光子固化成型点的弹性模量大约为宏观材料弹性模量的1／7．这为进一步研究双光子飞秒激光加工微器件的力学性能提供了基础．     

特种陶瓷成型方法

成型技术是制备陶瓷材料的一个重要环节.特种陶瓷成型方法总的来说可分为干法成型和湿法成型两大类,干法成型包括钢模压制成型、等静压成型、超高压成型、粉末电磁成型等;湿法成型大致可分为塑性成型和胶态浇注成型两大类;近些年来固体无模成型技术在特种陶瓷的成型研究中也取得了较为快速的发展.对特种陶瓷的这些成型方法进行了简要介绍,指出了各种成型方法的优缺点,并展望了特种陶瓷成型方法的发展趋势.     

塑料瓶成型收缩性能研究

本以塑料注射吹塑成型机为生产设备，从成型工艺条件，瓶体结构设计、塑料品种和模具结构四个方面研究分析影响瓶体收缩率的因素，总结如何获得高精度尺寸的药品包装用塑料瓶。     

药用塑料瓶成型后收缩性能分析

本以精密注射吹塑成型机为研究设备,从注吹成型工艺条件、塑料品种,进料口形式,模具及瓶体结构设计等方面研究分析药用中小型塑料瓶成型后的收缩性能,总结出如何获得高精度尺寸的塑料容器。     

RTM成型复合材料中微观缺陷表征及分析

通过对RTM成型复合材料制件及其预成型体进行解剖,并采用光学显微镜及扫描电镜对制件缺陷及预成型体表征,结果显示预成型体中定型剂富集的铺层与缺陷位置一致;并分析了缺陷表观形貌,阐述了缺陷形成原因。     

一种新型运输包装箱的开发与设计

目的 开发设计一种适用于供应链包装系统背景下的新型运输包装箱。方法 首先进行线上和线下的调研,了解供应链包装系统下现有运输包装箱的基本信息以及问题点。其次,根据调研情况研发新型运输包装箱来替代现有产品,同时根据模拟测试进行经济效益预测。结果 该运输包装箱在绿色环保、作业效率、成本等方面,均比现有运输包装箱优越。结论 该运输包装箱是一种适用于快销行业的共享型绿色运输包装箱,价格低廉,使用方便,节能环保,功能丰富,其综合技术指标优良,且其操作性强,性价比高,具有很高的市场前景,是迎接智能物流时代的必然产物。     

烟用包装材料交验抽样方法研究

本文以国家抽样检验标准为依据，结合烟草行业自身特点，对制定烟用包装材料交验抽样方法的原则、依据和方法进行了较为深入的探讨和研究，以卷烟条与盒包装纸为例，设计了基于三个不同国家抽样标准下的三种交验抽样方案，通过对三种方案分别进行分析评价，给出了各自的使用条件和使用方法，对提升烟草行业烟用包装材料交验抽样工作的规范化和科学化水平具有一定的促进作用。     

Experimental preforming of highly double curved shapes with a case corner using an interlock reinforcement

This experimental work concerns the study of the preforming of a specific highly double curved geometry with a triple point (case corner) by the sheet forming process using powdered interlock reinforcement (G1151®). Three different punches (square box, prism, tetrahedron) were used in this study, each of them presenting highly double curved geometry with a case corner. A specific sheet forming device specially designed for the preforming of textile reinforcement was used. The expected shapes with the three punches have been obtained with an optimized blank-holder pressure. No classical defaults such as wrinkling or yarn damage are present in the useful zone of the preforms. However, a new default, not observed for spherical or hemispherical shape has been identified. It concerns the out of plane buckling of yarns. This phenomenon not observed on the square box is visible on some faces and edges of the prismatic and tetrahedron shapes. For the square box, it is easily possible to control the orientation of the yarn within the preform in the faces, whereas this is not possible for triangular faces of the prismatic and tetrahedron shapes. The square box punch is therefore more adapted to preform the highly doubled curved shape with the case corner.     

3D Forming of Paperboard: The Influence of Paperboard Properties on Formability

Paper and paperboard are widely used in various types of packaging. Paper‐based packaging is a recyclable, biodegradable, renewable and sustainable product, which gives it certain advantages over most plastic‐based packaging materials. Although paper‐based packaging, in some areas, lacks attractiveness in terms of visual appearance, 3D forming is an important method for producing advanced shapes from paper and paperboard, suitable, for instance, for modified atmosphere packaging. That said, very little is known about the deformations experienced by paper‐based materials in 3D forming. Understanding the role played by the mechanical properties of paper and paperboard in the 3D forming process is key to improving performance. This paper presents experimental results obtained using three different forming devices designed to be used with paper‐based materials and links the formability data with specific mechanical properties of the paperboard samples. Paperboard properties that were found to correlate with formability were as follows: compressive strength and strain, tensile strain, paper‐to‐metal friction and out‐of‐plane stiffness. The requirements for formability are different for the fixed blank forming process and sliding blank forming process. Copyright © 2013 John Wiley & Sons, Ltd.     

Corrugated Box Compression—A Literature Survey

The past 130+ years of research into the production of corrugated packaging has produced a tremendous wealth of information about the structural dynamics of corrugated boxes in use and in failure. Most of the studies in this area were published in the journals of the paper industry. However, much of the current work on corrugated fiberboard packaging now comes from individuals with a focus on corrugated packaging as a whole rather than on the corrugated paper or structures that comprise the packaging material. Because of the difficulty in accessing or identifying some of the previous art, more recent studies may tread ground well covered by others decades earlier. This review focuses on the process of box compression and the utility of box compression testing, bringing previous work back to the fore to provide useful background for current studies. It examines the conditioning and testing process in detail, discusses the state of the art in compression estimation, and explores various parameters that affect box compression strength that are not captured in most current industry models. It also looks at how box compression results are related to field performance of boxes in unit loads. In the process, it identifies many areas for fruitful new research. Copyright © 2013 John Wiley & Sons, Ltd.     

Plane strain transversely anisotropic analysis in sheet metal forming simulation using 6-component Barlat yield function

In most FEM codes, the isotropic-elastic and transversely anisotropic-elastoplastic model using Hill??s yield function has been widely adopted in 3D shell elements (modified to meet the plane stress condition) and 3D solid elements. However, when the 4-node quadrilateral plane strain or axisymmetric element is used for 2D sheet metal forming simulation, the above transversely anisotropic Hill model is not available in some FEM code like Ls-Dyna. A novel approach for explicit analysis of transversely anisotropic 2D sheet metal forming using 6-component Barlat yield function is elaborated in detail in this paper, the related formula between the material anisotropic coefficients in Barlat yield function and the Lankford parameters are derived directly. Numerical 2D results obtained from the novel approach fit well with the 3D solution.     

一种基于复合纸板的新型重型纸质包装箱

目的开发一种用于机电产品包装的新型重型纸质包装,以代替目前的木质包装箱。方法在对现有重型纸质包装研究分析的基础上,评估蜂窝纸板及各种瓦楞纸板的优劣势。采用A瓦楞/蜂窝/B瓦楞复合纸板,利用该复合纸板设计一种新型重型纸质包装,并利用Solid Works软件对2种箱板结合形式的重型纸质包装进行静载力学对比分析。结果该新型箱板结合形式能够改善箱体的应力分布状况。结论该新型重型纸质包装节约储运空间,易于成形,在一定程度上改善了箱体应力分布,是一种理想的代木包装结构形式。     

梅山地区图腾文化在食品包装设计中的应用

目的探讨梅山地区图腾文化在其特色食品包装设计中的应用。方法分析梅山图腾具体形象的提取与变化手法,提出直接引借图腾形象、将图腾平面符号拼贴解构或将食品包装结构分解重构成图腾形状等方法。阐述以隐喻和象征手法提炼与再现图腾文化内涵。隐喻设计手法中,分别探讨喻体是具体事物、抽象精神和有纵向时间的事件3种图腾形式在当地食品包装设计中的体现方法;象征设计手法中则研究了单义象征和多义象征、无意识象征和有意识象征两组表达手法将图腾文化融入食品包装的应用方式。结论以梅山地区图腾形象及其文化为切入点,从平面到结构多角度提高当地特色食品包装设计的文化性与艺术性,有利于树立其品牌形象并推动消费以及梅山文化的传播。     

缓冲包装CAD系统

目的主要介绍缓冲包装CAD系统及其运行流程。方法系统以Visual Basic为编程语言,实现了缓冲衬垫计算与校核、瓦楞纸箱计算与校核、数据处理、图片显示等功能。系统完善了缓冲衬垫和瓦楞纸箱数据库,以方便对规则产品的运输包装设计。结果该系统的设计结果既满足了产品运输中对防护的要求,又避免了人为误差,减少了破坏性试验,缩短了产品研发周期。结论系统将计算机与包装技术有效结合,在理论和实践上发展了运输包装的设计技术,使复杂的设计过程变得简单快捷。     

Efficient and accurate simulation of the packaging forming process

To allow for large‐scale forming applications, such as converting paperboard into package containers, efficient and reliable numerical tools are needed. In finite element simulations of thin structures, elements including structural features are required to reduce the computational cost. Solid‐shell elements based on reduced integration with hourglass stabilization is an attractive choice. One advantage of this choice is the natural inclusion of the thickness, not present in standard degenerated shells, which is especially important for many problems involving contact. Furthermore, no restrictions are imposed on the constitutive models since the solid‐shell element does not require the plane stress condition to be enforced. In this work, a recently proposed efficient solid‐shell element is implemented together with a state‐of‐the‐art continuum model for paperboard. This approach is validated by comparing the obtained numerical results with experimental results for paperboard as well as with those found by using 3D continuum elements. To show the potential of this approach, a large‐scale forming simulation of paperboard is used as a proof of concept.