MD Microstriations in paper: a two-sided shrinkage phenomenon?

M. A. MacGregor, T. E. Conners

Research output: Contribution to journalConference articlepeer-review


Very small striations, highly oriented in the machine direction (MD), were observed on one side of finished paper from various paper machines. Observations and measurements of this previously unreported roughening showed it to adversely affect coating and printing quality. Other observations showed the MD microstriations were always worse on the paper side that was pressed against the wet felts in the last nip or two. However, we could find no correlation between the striations in the paper and the felt contact pattern and, therefore, feel the mechanisms involved in this particular roughening are not directly caused by embossing from the felt. Several other roughening mechanisms are discussed. We currently think that the most viable mechanism appears to be an interaction between pressing and drying which leads to a different shrinkage on each side of the paper. The differential shrinkage in turn causes a microscale buckling which appears worse on one side.

Original languageEnglish
Pages (from-to)293-300
Number of pages8
JournalEngineering Conference, Proceedings of the Technical Association of the Pulp and Paper Industry
Issue numberBk-2
StatePublished - 1988
Event1988 Engineering Conference - Chicago, IL, USA
Duration: Sep 19 1988Sep 22 1988

ASJC Scopus subject areas

  • General Engineering


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