Page 181 - Root Cause Failure Analysis
P. 181
Process Rolls 169
U
n
Figure 13-6 A roll with uneven elevation becomes a steering roll.
other. Figure 13-7 illustrates a paired set of scrubber rolls in which the strip is cap-
tured between the two rolls and the counter-rotating brush roll cleans the strip surface.
The design of some roll pairs makes it difficult to keep them parallel. Many have a
single pivot point to fix one end of the roll and a pneumatic cylinder to index the
opposite end. Others use two cylinders, one attached to each end of the roll. In this
design, the two cylinders are not mechanically linked and the rolls do not maintain
their parallel relationship.
Backup Roll 1
7
Figure 13-7 Scrubber roll set.
