High-intensity drying processes-impulse drying. Yearly report
Impulse drying is an innovative process for drying paper that holds great promise for reducing the energy consumed during the manufacture of paper and similar web products. impulse drying occurs when a wet paper web passes through a press nip in which one of the rolls is heated to a high temperature. A steam layer adjacent to the heated surface grows and displaces water from the sheet in a very efficient manner. The energy required for water removal is very much less than that required for conventional evaporative drying. To eliminate sheet delamination, low thermal mass ceramic press roll coatings were developed to reduce heat transfer to the sheet, while maintaining high heat flux during early stages of the process. In so doing, most of the transferred energy is used to form steam that displaces liquid water, rather than in excessively heating the sheet. During this period, a prototype ceramic coating was developed and its impulse drying performance was compared to that of steel surfaces. It was observed that ceramic platens can be operated at higher temperatures and pressures resulting in improved water removal and physical properties without inducing sheet delamination. Heat flux measurement techniques were developed to provide a mechanistic explanation for the superior performance of the prototype. The work confirmed that the prototype ceramic coating is more energy efficient than the steel surface.
- Research Organization:
- Institute of Paper Science and Technology, Inc., Atlanta, GA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-85CE40738
- OSTI ID:
- 10143700
- Report Number(s):
- DOE/CE/40738--T6; ON: DE93012404
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-intensity drying processes-impulse drying
High-intensity drying processes: Impulse drying
High-intensity drying processes: Impulse drying
Technical Report
·
Sat Jun 01 00:00:00 EDT 1991
·
OSTI ID:6626698
High-intensity drying processes: Impulse drying
Technical Report
·
Sat Sep 01 00:00:00 EDT 1990
·
OSTI ID:5497716
High-intensity drying processes: Impulse drying
Technical Report
·
Mon May 01 00:00:00 EDT 1989
·
OSTI ID:5371131