Parabolic Crowned Rollers
Increase your machine speed… Experience first hand how a properly calculated Parabolic Crown can increase the speed, function and operation of your equipment. It is a proven fact that all rollers under a manipulating load or hydraulic pressure experience roll deflection and unequal elastic polymer flow across the nipped roll face. The deflection described above, follows engineering's basic beam principle, shown here.
A crown is a designed contour on the surface of a roll above the diameter and is continuously decreasing non-linearly from the center point to both ends. If you are in search of smoother runs, better quality, faster performance, coupled with longer rubber life with better wear, longer bearing life and reduced machine vibration… look no further. Many customers have tried crowns such as those shown in illustration #2, which uses no rhyme or reason other than trial and error to produce a taper from a larger roll diameter in the center. This is NOT a true crown. A true crown, used to equally distribute load force and equalize nip impression, requires a true radius or cosine crown, as shown in illustration #3.
There are two methods available to determine the crown needed for a given nip load.
A nip impression can also confirm roller alignment, side to side pressure differences, indicate whether a roll will run hotter (greater hysteresis), and faster wear on ends compared to the middle. Inside nip action is also detected with this impression. Nip stresses and speeds will vary as the substrate passes through, resulting in poor performance. Menges Roller wants you to experience the difference that true parabolic profiles can make in your operation.
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