Abstract
One of the key technological events of the 1980's in papermaking was the development and implementation of the soft nip calendering, on or off-line, The technology found many applications and is gaining acceptance around the world. When some of the present technical problems are resolved, it may become a standard feature of all paper machines.As the CD profile control technology continues to improve, the primary role of the calender has been shifting from the traditional reel building tool to that of surface finishing. During the second half of the 1980's, we examined the technology for various paper and paperboard operations. In this paper, I would like to share with you some of our findings from pilot trials and laboratory evaluations.High temperature soft nip calender (HTSNC) has a nip that is hot, long and of low specific pressure. It works primarily on the small scale roughness of the paper surface. This may or may not be of practical value depending on the paper grades and their end-use requirements. Benefits from new technology can never be scrutinized too much.
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