Spacing Characteristics Between Moving Permeable Web and Roller

在塑料片材、纸张、磁带、照相胶片等制造领域，这些连续的柔性材料通常被称为“幅材”，并且经常使用由导辊支撑的幅材输送系统。此外，除了输送过程之外，系统中还包括幅材卷绕过程。在这样的系统中，为了更好地理解虚拟条件和提高幅材处理过程的效率，估计幅材和导辊之间或卷绕幅材中的层之间的夹带空气膜厚度（润滑空气膜厚度）是至关重要的。在纸幅处理过程中，通常采用基于无限长宽箔片支承理论的气膜厚度公式来估算卷吸气膜厚度。但在腹板宽度较小的情况下，无限长支承假设会给气膜厚度的估算带来一定的定量误差。因此具有 ...更多信息 需要更准确地估计空气膜厚度，以考虑卷筒纸宽度的影响。针对这一要求，Hashimoto最近基于可压缩Reynolds方程和卷筒纸弹性方程的数值解，得到了以卷筒纸宽度、卷筒纸张力和卷筒纸速度为参数的卷筒纸与罗拉之间的卷吸气膜厚度的简便估算公式。然而，据作者所知，还没有发表的文章，实验研究的影响幅材宽度的幅材和导辊之间的夹带空气膜厚度。在气膜厚度的测量中，使用了宽度较窄的录音带和宽度相对较宽的纸张作为卷材，并针对每种情况使用了两种类型的测试台。测量速度和纸幅张力的各种组合的空气膜厚度。将实测结果与基于Hashimoto简化公式的计算结果进行了比较，并从理论和实验上研究了腹板宽度对气膜厚度的影响。少

In the manufacturing fields of plastic sheet, paper, magnetic tape, photographic film etc., these continuous flexible materials are generally called "web", and the web transporting systems supported by the guide rollers are often used. Moreover, in addition to the transporting processes, the web winding processes are included in the systems. In such systems, it is of cardinal importance to estimate an entrained air film thickness (lubricating air film thickness) between web and guide roller or between layers in the wound web for better understanding the fictional conditions and for improving the efficiently of web handling processes. The air film thickness formula based on the infinitely long width foil bearing theory is usually used for the estimation of entrained air film thickness in the web handling processes. However, in the case of small web width, the infinitely long bearing assumption will cause some quantitative errors in the estimation of air film thickness. Therefore, it has … More been required for more accurate estimation of air film thickness to take into account the effects of web width. For such a requirement, Hashimoto obtained recently the convenient simplified formula for the estimation of entrained air film thickness between web and roller, which includes the web width, web tension and web velocity as parameters, based on the numerical solutions of compressible Reynolds equation and web elastic equation. However, as far as the authors know, there is no published paper examining experimentally the effects of web width on the entrained air film thickness between web and roller.In this research work, the effects of web width on the entrained air film thickness between web and guide roller were examined experimentally. The narrow width of audio-tape and the relatively wide width of paper were used as web in the measurements of air film thickness and two types of test rigs were used for each case. The air film thickness was measured for various combinations of velocity and web tension. The measured results were compared with the calculated results based on the simplified formula derived by Hashimoto and the effects of web width on the air film thickness were examined theoretically and experimentally. Less