THE JANUS CONCEPT - AN ALTERNATIVE TO THE SUPERCALENDER

High quality paper grades were up till now to be calendered only on su percalenders or high sophisticated softcalenders. The experiences from the construction and operation of many thousand super- and softcalend ers showed clearly all the shortcomings of these machines referring to effectivity and economy. For these reasons conventional calenders wer e to put all in question and a new technology, based on experiences re cently made was to develop. So the JANUS Concept, a completely new cal endering technology was created. The paper deals with the arguments le ading to this costly development and it describes the technical featur es of the new conception. Furthermore there are examples stated for dr astically energy savings and the efficiency benefits obtained due to t hat fact. The calendering results obtained online also with papermachi ne- and coater speeds are discussed, above all for high quality rotogr avure printing papers.