CALENDER FOR TREATING BOTH SIDES OF A PAPER WEB

摘要

A calender for the two-sided treatment of a paper web has two similar stacks each of which has at least two soft rollers and two hard rollers. Working nips are formed between each hard and soft roller. The calender has at least one working nip wherein the dwell time (t) is at least 0.1 ms, the surface temperature (T) is at least 100.degree.C, and the load (P) on the stack creates an average compressive stress in the working nip of more than 42 N/mm2. This provides a calender that is smaller and less expensive to manufacture and operate than super-calenders of the prior art but that also affords excellent finishing results.