Theoretical and Experimental Investigations Into Spacing Characteristics Between Roller and Three Types of Webs With Different Permeabilities
Theoretical and Experimental Investigations Into Spacing Characteristics Between Roller and Three Types of Webs With Different Permeabilities
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DOI：
10.1115/1.2164463
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发表时间：
2006-04
影响因子：
2.5
通讯作者：
H. Hashimoto;M. Okajima
中科院分区：
文献类型：
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作者：
H. Hashimoto;M. Okajima
提出了一种估算不透水和透水腹板与辊子间夹带气膜厚度的新理论模型。通过对可压缩雷诺方程和腹板平衡方程的大量同时数值解，得到了考虑腹板边缘漏气和腹板渗透性引起的空气扩散影响的气膜厚度的简单曲线拟合公式。测量了三种典型卷材：聚对苯二甲酸乙二醇酯卷材、铜版纸卷材和新闻纸卷材的气膜厚度随滚筒速度的变化。在较宽的辊速范围内，从理论上和实验上考察了腹板渗透率、腹板宽度和腹板张力对气膜厚度的影响。预测结果与实测结果在数量和质量上都有合理的一致性。实验验证了该公式对卷筒纸界面问题一阶估计的有效性。
A new theoretical model for estimating the entrained air film thickness between a web and roller is presented for both impermeable and permeable webs. A simple curve fit formula for estimating the air film thickness, which considers the effects of air leakage from the web edges and air diffusion due to the permeability of web, was obtained based on a large number of simultaneous numerical solutions of the compressible Reynolds equation and the web equilibrium equation. The variation of air film thickness with roller velocity is measured for three typical webs: polyethylene terephthalate, coated paper, and newsprint. The effects of web permeability, web width, and web tension on the air film thickness are examined theoretically and experimentally for a wide range of roller velocity. Reasonable agreement is seen both quantitatively and qualitatively between the predicted and measured results. The validity of the formula for the first-order estimation of web-roller interface problems is verified experimentally.