Blog Archives

Part 1: Web Guiding Systems in Roll to Roll Winding System

Webs do not always track down through a machine in a consistent location. On a roll-to-roll operation, for example, any offsets in the unwinding roll will cause the web to get started through a machine in a variable CD (cross direction) position. However, even if a web starts out in the position, it may take slightly different paths through the machine depending on several factors. First, a variably baggy or cambered web will cause the web to track toward the variably tighter side. Second, variabilities in roller traction or drag can cause a steering...
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Part 4: Unwind and Rewind Guides in Roll Winding Systems

In Part 3 of the Web Guiding Systems Series we discussed Web Displacement Guide.

Unwind Guides

[caption id="attachment_2700" align="alignleft" width="200"]Unwind Guides Figure 4 - Unwind Guides[/caption] Sometimes it is important on roll-to-roll web lines to start the web down an appropriate path despite poor edge quality of the unwinding roll or variations in web width or roll positioning. In these cases, an unwind guide would be used as seen in Figure...
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Part 3: Web Displacement Guide in Roll Coating Systems

In Part 2 of the Web Guiding Systems Series we discussed web steering guides.

Web Displacement Guide

[caption id="attachment_2699" align="alignright" width="200"]Web Displacement Guide Figure 3 - Web Displacement Guide[/caption] When a sufficiently long entry span is not available, a displacement guide may be a better choice. The displacement guide, as seen in Figure 3, is a system of four rollers. The first and last are fixed, while the center two rollers...
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Part 2: The Web Steering Guide in Roll to Roll Systems

In Part 1 of this series we introduced web guiding systems in roll-to-roll winding.

Web Steering Guide

[caption id="attachment_2698" align="alignleft" width="200"]Web Steering Guide Figure 2 - Web Steering Guide[/caption] The web steering guide, as shown in Figure 2, is a roller that has ends which are mounted on a pair of angled linear bearings. As the actuator pushes the roller sideways, the raceways cause the guide roller to pivot about an imaginary point called the instant center. The principles of...
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