Comparing 4 rolls vs. 3 rolls. What are the advantages and disadvantages?

Four-roll technology has been around almost since the turn of the century: however, it was impractical, as the improved production did not justify the costs.

With the advances in Fluid Technology this has changed dramatically. It is now possible to buy a four-roll machine for very nearly the cost of a three-roll double pinch machine.

Is this an important development to plate roll users?  To answer this question, let’s briefly review the functions of the single initial pinch roll, double pinch roll and the basic pyramid roll.

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