High-intensity drying processes: Impulse drying
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. Hence, it has been projected that wide commercialization of impulse drying would result in at least a 10% industry-wide energy saving. This report covers work completed between October, 1988 and September, 1989. During this period, pilot press trails demonstrated that newsprint as well as linerboard experience delamination. Hence, the major focus of the research was the resolution of the delamination problem. In order to document potential process improvements, measurement methods were developed to quantify sheet delamination. Using these methods, low thermal diffusivity ceramic roll surfaces were shown to extend the range of impulse drying operating conditions while avoiding sheet delamination. As compared to steel surfaces, ceramics were found to provide significantly higher water volume without inducing sheet delamination. 46 figs., 4 tabs.
- Research Organization:
- Institute of Paper Science and Technology, Atlanta, GA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-85CE40738
- OSTI ID:
- 5497716
- Report Number(s):
- DOE/CE/40738-T5; ON: DE91014200
- Country of Publication:
- United States
- Language:
- English
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High-intensity drying processes-impulse drying. Yearly report
High-intensity drying processes: Impulse drying
Related Subjects
PAPER
DRYING
PAPER INDUSTRY
ENERGY CONSUMPTION
ELASTICITY
HEAT TREATMENTS
PRESSING
PROGRESS REPORT
THERMAL DIFFUSION
WATER REMOVAL
DIFFUSION
DOCUMENT TYPES
FABRICATION
INDUSTRY
MATERIALS WORKING
MECHANICAL PROPERTIES
REMOVAL
TENSILE PROPERTIES
WOOD PRODUCTS INDUSTRY
320303* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Equipment & Processes