Part 7: Edge Pull Web Spreading Rollers

This entry is part 7 of 8 in the series Pros & Cons of Six Common Web Spreading Rollers

Edge Pull Web Spreading Roller are the most powerful spreaders, and are sometimes capable of increasing web width by hundreds of percent.

Edge Pull Web Spreading Rollers are the most powerful spreaders, and are sometimes capable of increasing web width by hundreds of percent. Obviously, strains this large are limited to very stretchy materials such as films, nonwovens and textiles. Indeed, the intent may be to draw the web permanently wider.

Edge Pull Web Spreading Roller

Figure 9 – Edge Pull Web Spreading Roller

Edge Pull Web Spreading Rollers are a pair of narrow, soft covered nipping rollers on each edge of the web which are canted outward, as seen in Figure 9. Unfortunately, these spreaders are often finicky to set up. Another edge pull spreader is the tenter used in the manufacture of some films and textiles. This spreader has an endless track which guides a chain with numerous clips which pull the web outward following the shape of the tenter track, and release it on the downstream side. A disadvantage of edge pull stretchers are severe stress gradients. Sometimes the edges are damaged so that they must be trimmed off.

Web Spreading Rollers

Series Navigation<< Part 6: Expander Web Spreading RollersPart 8: Benefits of Web Flattening without Web Spreading Rollers >>

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