An increase in production speed in web-conveying plants while complying with the quality requirements requires the precise geometrical alignment of the plant.
Parallelism of the rolls among one another is as important as perpendicularity of all rolls to the reference axis of the machine. Modern measuring methods for geometrical plant alignment are explained in the following.
Why do we measure parallelism?
Rolls in web-conveying plants define the direction of the material flow. This applies to the material as well as the clothing. Non-parallel rolls cause a transversal force FT leading to asymmetrical tension of web and clothing. This leads to paper tears, wrinkling, and frequent wire replacements.