High-intensity drying processes: Impulse drying

Technical Report · Mon May 01 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/5371131· OSTI ID:5371131

Orloff, D. I.

Impulse drying is an innovative process for drying paper that holds great promise for reducing the energy consumed during manufacture of paper and similar web products. Impulse drying occurs when a wet paper web passes through a press nip where one of the rolls is heated to a very high temperature. Steam generated by contact with the hot roll expands and displaces water from the sheet in a very efficient manner. The energy required for water removal is much lower than that required for conventional evaporative drying. Tests have been completed that elucidate the unique displacement mechanism of water removal in the impulse drying process. A pilot roll press has been designed, installed and used to examine impulse drying under conditions that simulate commercial press conditions. The results of this earlier work have been reported in three previous reports. During this report period October, 1987 to September, 1988, the pilot press was equipped with a second impulse drying roll to facilitate studies of surface uniformity in impulse dried paper. Studies have also been completed which examine the origins of sheet delamination that has been been encountered during impulse drying of certain heavyweight paper grades, and which investigate approaches to prevent delamination in these grades. Finally, an experimental plan has been formalized to examine impulse drying of lightweight grades which are candidates for early commercialization. 7 refs., 30 figs., 3 tabs.

• Research Organization: Institute of Paper Science and Technology, Atlanta, GA (USA)
• Sponsoring Organization: DOE/CE
• DOE Contract Number: FG02-85CE40738
• OSTI ID: 5371131
• Report Number(s): DOE/CE/40738-T4; ON: DE90002900
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320303* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
DRYING
ENERGY CONSUMPTION
FABRICATION
INDUSTRY
MATERIALS WORKING
PAPER
PAPER INDUSTRY
PRESSING
REMOVAL
STEAM
WATER REMOVAL
WOOD PRODUCTS INDUSTRY