The Effect of Web Permeability and Side Leakage on the Air Film Height Between a Roller and Web
The Effect of Web Permeability and Side Leakage on the Air Film Height Between a Roller and Web
复制标题
幅材渗透性和侧漏对辊与幅材之间气膜高度的影响
DOI：
10.1115/1.2834587
复制
发表时间：
1998
影响因子：
2.5
通讯作者：
J. K. Good
中科院分区：
文献类型：
--
作者：
K. S. Ducotey;J. K. Good
卷筒纸和滚筒之间夹带的空气会造成牵引力的损失，从而影响卷筒纸的质量。夹带的空气形成空气层，将卷筒网与滚筒分开。此时存在牵引力不足，惰轮将无法被卷筒纸驱动。然而，其他应用，如在转盘上移动的新闻纸，则需要完全清除。利用箔轴承理论，建立了预测透水腹板与滚子之间气膜高度的方程。辊筒与腹板之间的分离距离h是辊筒半径R、腹板张力T、空气粘度η的函数。腹板和滚子速度之和(U)和腹板渗透率（α）。在恒压区，气膜高度沿辊子周长(8)呈线性下降。因此，气膜高度可简单表示为：h = 0.643R(6ηU /T) 2/3 - 2(αT / U)θ。气膜高度的斜率是腹板/辊速度、腹板张力和纸张渗透性的函数。结果中还考虑了侧漏的校正因子。
Air entrained between a web and roller can cause a loss in traction that can affect web quality. The entrained air causes an air layer to form which separates the web from the roller. Insufficient traction exists at this point and an idler roller will be unable to be driven by the web. Other applications, however, such as newsprint moving around a turnbar, require complete clearance. An equation for predicting the air film height between a permeable web and roller was developed using foil bearing theory. The separation distance (h) between the roller and web is a function of the roller radius (R), web tension (T), air viscosity (η). summation of the web and roller velocities (U), and the web permeability (α). The air film height was found to decrease linearly around the circumference (8) of the roller in the constant pressure region. Therefore, the air film height can be expressed simply as, h = 0.643R( 6ηU /T ) 2/3 - 2( αT / U )θ The slope of the air film height is a function of the web/roller velocity, web tension, and the permeability of the paper. A correction factor for side leakage was also incorporated into the result.