Drying and Heat Transfer Characteristics during Bench-Scale Press Drying of Linerboard.
Abstract
Drying rates and overall heat transfer (contact) coefficients were determined during laboratory press drying of linerboardweight handsheets. Both drying rates and contact coefficients increased with external (Z-direction) pressure up to 60 lb/sq in. and leveled off thereafter. A family of curves was obtained for drying temperatures of 250 to 550 F with higher drying rates and contact coefficients obtained at higher drying temperatures. As expected better thermal contact was obtained and higher drying rates resulted when webs at higher moisture content were dried. All drying rates and contact coefficients were higher than those reported for commercial linerboard production. Results of this study indicate that diffusion of the saturated water vapor (generated within the sheet during drying) may be the limiting factor which governs drying rate during press drying of linerboard.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1979
- Accession Number
- ADA078024
Entities
People
- Von L. Byrd
Organizations
- Forest Products Laboratory