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.

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With the advances in Fluid Technology this has changed dramatically. It is now possible to buy a four-roll machine for only about 20% more than 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…