| 摘要 |
<p>In the winding of webs of plastic films on cores, defects in the web caused by hard streaks in the wound roll are avoided or reduced by a new method of control. In this method, measurements are made of elastic properties of the web and of the average widthwise thickness distribution of the web. From these values, from measured properties of the core, and from selected initial winding conditions, including web tension, edge thickness and web oscillation, a predicted value of the combined imperfection severity function is determined. This value is compared with a pre-established tolerance; if it is outside the tolerance, winding conditions are adjusted to minimize the predicted web defects.</p> |
