INSTALLATION AND PROJECT PLANNING
Several points need to be observed to achieve the best-possible spreading effect:
1. Wrap angle
for Fourdrinier wires
15° - 20°
for FABRIC sieves
20° - 40°
Easily stretchable plastic webs, such as polyethylene, polypropylene and similar, according to thickness
Crease prevention and removing creases from textiles
Easily stretchable cotton
60° - 90°
All kinds of materials
60° - 90°
2. Distance to next guide rollerThe distance between the spreader roller and the next guide roller should not be too big. Experience tells us the best distance “E” should equal two to three times the diameter of the spreader roller.
3. FeedThe web should always be fed in from the concave side. The web path “A” can be longer, but it should not be more than 2 x “E”.
4. SettingWhen subject to normal material and tension ratios the spreader roller is set to the position depicted opposite. That ensures loads are applied uniformly to the whole of the roller, which prevents the rubber covering wearing unevenly.When processing webs with slack edges the concave side of the roller is swung out from its normal position until the edges bear firmly on both ends of the roller.When the middle of the web is slack the convex side of the roller is swung out from its normal position until the middle of the web is tensioned properly.