Effectiveness of Paper Dryer Journal Insulating Sleeves, 2011 PaperCon Conference

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Paper dryer journals are often insulated from steam inside the dryer by internal insulating sleeves. An insulating sleeve is a flanged tube that extends through the bore of a paper dryer journal. The flanged end of the sleeve is usually bolted to the inside surface of the dryer head and sealed by a gasket. The opposite end of the sleeve is usually sealed by o-rings in a journal adaptor flange. The insulating sleeve creates an insulating air gap in the annular space between the sleeve and the dryer journal bore. This insulating air gap helps to protect the dryer bearing inner race and maintain oil viscosity to provide long bearing life. This paper quantifies the effectiveness of insulating sleeves. It covers the results of an analysis of the heat transfer from the steam to the dryer bearings and it provides test data to confirm the results of the analysis.