There are two types of roll stands, shafted and shaftless.
Shaftless roll stands require the least time to change since all that is required is to position the roll in place, insert the chucks, and raise the roll.
Having the rolls stripped of their wrappers, staged and ready to load will expedite this process. This procedure can be done in less than 5 minutes.
Shafted roll stands take more time since the shaft must first be removed, then one chuck taken off. The shaft must be inserted through the new roll’s core, the chuck replaced, and the roll raised into position by means of a hoist or other lifting device. This process can easily take 15 minutes for each roll.
Several things can be done to minimize this time. Again, have the rolls prepared first. Having a second shaft and pair of chucks allows the next roll to be prepared in advance. The use of air shafts eliminates the need for handling chucks and speeds up the process.
