Date of Award

4-1988

Degree Name

Bachelor of Science

Department

Paper Science and Engineering

Abstract

A comparison was made of the surface and printing properties of eucalyptus and loblolly handsheets which were subjected to different supercalendering conditions. Supercalendering nip pressure was kept constant (2000 pli). The different supercalendering conditions investigated were the effects of the steel and filled rolls on the paper quality produced. The differences between the two pulps were large and this was attributed to the compressible nature of the two different fiber network structures. The more compressible eucalyptus sheet obtained better surface and printing properties at a given nip pressure. The eucalyptus sheet also showed no significant change in properties obtained under different supercalendering conditions. The less compressible loblolly sheet showed less response to nip pressure but a preferential development of properties caused by the steel roll. This different supercalendering response imported a two-sidedness onto the loblolly sheet. A thorough investigation into the nature of furnish compressibility and supercalendering theory should result in a better understanding of the properties developed by an uncoated paper.

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