It is applied when web guides are used to steer webs. This web handling principle is applied to route webs through processes with parallel idler rolls and driven rolls. The web handling principle states a web will seek to align itself perpendicular to an idler or driven roll. The web must be "in traction" with all machine idler rolls and driven rolls to ensure proper web handling and control. It is impossible to control a web without proper tension being applied to it. PLI would be equal to the weight in pounds divided by the web width in inches. The tension on the web would be equal to the weight in pounds. The tension applied to a web can be described as the web’s tautness as it would be if you hung a weight off the edge of the web. Total pounds of tension = PLI x web width in inches>.PLI = total pounds of tension / web width in inches.If you know total pounds of tension applied to the web and you want to know PLI, divide the total pounds of tension across the web by the width of the web in inches.
If you know PLI and you want to know total tension applied to the web, multiply PLI times the width of the material in inches. Typically, tension is measured in PLI (pounds per linear inch) in the US. For this basic tutorial in the mechanics of web tension control, tension is defined as the force applied to a continuous web of material in the machine direction.
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