CD CALIPER CONTROL ON SOFT NIP CALENDERS - A REPORT ON INDUCTION-HEATING TECHNIQUES

On-machine nip calenders have become increasingly common over the past decade. The benefits of these installations have been extensively dis cussed in the literature. Little attention is, however, paid to the pr oblems of CD caliper profile control. This paper first reviews the imp ortance of CD base sheet weight and moisture profiles in producing a f lat sheet, then discusses the various techniques available for control ling CD caliper profiles on these calenders. Results from pilot and mi ll installations are used to illustrate the standards that can be achi eved.