Helical winders

Additional patterns have been simulated, including near 0 to about 90 helices. Test cylinders have also been wound with roving. The graphical presentation is effective for conformation before winding and demonstrates the successful development of a numericeiUy controlled, filament winder. 

Bundle Preparation. Packages of multifileiment yarns are backwound to prepare bundles necessary for the manufacture of a reverse osmosis module. A proprietary winder for this operation has been designed and constructed at Albany International Research Co. This device is capable of helically winding multifilament yarns into bundles around a mandrel. This is done in a manner such that the resulting bundle has uniform cylindrical dimensions and uniform fiber density. This minimizes channeling and optimizes exposure of membrane surface area. 

In the tumble-type winder (Fig. 22), the mandrel is tumbled end over end during a polar wind, whereas the feed eye is traversed and the mandrel rotated in the normal lathe-type fashion for helical or circumferential winds. This type is widely used for high volume commercial products such as water-softener tanks and pool filter tanks. 

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