Improving the Quality of Web Material Production Through a Higher-Order Stress and Stability Model

该研究项目的目的是提高对金属，纸张和聚合物材料制造和缠绕成大型卷或线圈时发生的应力和缺陷的理解。 该研究方法有两个任务：开发一个高阶的数学模型内的应力状态的卷绕辊，并进行实验室实验，以测量应力和条件等故障模式的发生，如V型屈曲，下垂崩溃，和星。 该研究特别针对非线性材料特性、辊径向和宽度方向上的应力变化、粘弹性特性、由于层间摩擦损失引起的滑移以及张力调度和包装辊设计等工艺改进。如果成功，该研究项目的结果将改善宽连续金属板、纸和聚合物材料的生产，其有时被称为“网”。“由于高卷绕张力和复杂的材料特性，卷绕辊可能变得不稳定、弯曲，甚至完全塌陷。 该研究将推进与幅材材料和辊的本构特性相关的知识。 将确定驱动卷绕辊中缺陷形成的干扰的关键来源。 这项工作的潜在应用可能包括制造用于饮料容器的铝板，以及生产用于计算机数据盒的聚合物基膜。 工业从业者可能能够以最小化对下层卷的损坏、降低废品率并提高其产品质量的方式将发现应用于卷绕幅材材料。

The objective of this research project is to develop an improved understanding of the stresses and defects that occur when metal, paper, and polymer materials are manufactured and wound into large rolls or coils. The research approach has two tasks: developing a higher-order mathematical model for the state of stress within a wound roll, and conducting laboratory experiments to measure stresses and conditions for the onset of such failure modes as v-buckling, sag collapse, and starring. The research specifically addresses non-linear material characteristics, stress variations in the roll's radial and width-wise directions, viscoelastic properties, slippage due to loss of layer-to-layer friction, and such process improvements as tension scheduling and the design of packing rollers.If successful, the results of this research project will improve the production of wide continuous sheets of metal, paper, and polymer materials, which are sometimes referred to as "webs." Because of high winding tension and complex material characteristics, wound rolls can become unstable, buckle, or even collapse entirely. The research will advance knowledge relating to the constitutive characteristics of web materials and rolls. The key sources of disturbances that drive the formation of defects in wound rolls will be identified. Potential applications of the work may include the manufacture of aluminum sheet stock used in beverage containers, and the production of polymer base films that are used in computer data cartridges. Industrial practitioners may be able to apply the findings to wind web materials in a manner that minimizes damage to the underlying roll, that decreases scrap rates, and that improves the quality of their product.