Yhtyneet Paperitehtaat Oy

Jaakko Sarantola

Jyrki Taipale

A method for calendering paper, especially with glassine calendering in a calender which comprises press rolls arranged successively in the paper-advancing direction where, at least between some of the rolls, press nips are formed for passing paper therethrough. Each press nip is preferably formed by a pair of rolls, one of which is hard and the other elastic. Paper is advanced into the calender at an initial moisture X within the range of 12% .ltoreq..times..ltoreq.25%, at least one of the press nips having a calculable line pressure higher than 250 kN/m. In operating conditions, the ratio X/LP between paper moisture X and calculable line pressure LP is maintained in the press nips within predetermined limits in such a manner that the maximum value of ratio X/LP divided by the minimum value of ratio X/LP is .ltoreq.2.15, whereby X refers to the moisture percentage of paper and LP is the line pressure at a particular press nip expressed as a quantity kN/m (kilonewton/meter).

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Valkeakoski, Finland

Jaakko Sarantola