Measuring and testing – Moisture content or absorption characteristic of material – By desiccation or extraction
Patent
1980-03-10
1982-01-26
Ruehl, Charles A.
Measuring and testing
Moisture content or absorption characteristic of material
By desiccation or extraction
G01N 504
Patent
active
043122191
ABSTRACT:
An apparatus that is capable of continuously measuring the weight loss of a light weight, porous sheet material during drying while in constant contact with a heated surface. The resulting data may be converted to drying rate curves suitable for analyzing the effects on drying rate of furnish additives and processing conditions. The testing device is particularly useful for evaluating grades of paper or paperboard having basis weights greater than 50 g/m.sup.2. The device includes an electrically heated arcuate plate maintained at a constant temperature. The paper sample to be tested is brought into good heat transfer contact with the plate by means of a tensioned fabric that exerts a normal load on the sample but does not interfere with mass transfer of the vapor away from the drying sample. An air ventilating system provides a low turbulence flow of air uniformly over the fabric covering the sample. The plate, sample and fabric are supported by a load sensor that measures changes in weight of the sample during drying to 0.01 g. A special electrical connector between the power source and the heating elements of the hot plate isolates the power source from interference with the weighing measurement. Current is supplied to mercury pots, independently supported of the hot plate. Probes mounted on the hot plate and connected to the plate heating elements partially submerge in the mercury pots, transmitting power to the plate.
REFERENCES:
patent: 1089826 (1914-03-01), Emerson
patent: 3055206 (1962-09-01), Watson et al.
Dreshfield, Jr.-"Hot-Surface Drying of Fibrous Sheets"-Chem. Eng. Prg., 53(4):174 (1957).
Kirk, et al.-"Hot Surface Drying of Paper", Paper Technology, 11(5):347 (1970).
Sherwood-"The Drying of Solids-II"-Ind. Eng. Chem., 21(10):976 (1929).
Smith, et al.-"Paperboard Drying Investigation by Means of an Experimental Drying Machine," TAPPI, 36(11):481 (1953).
Hinds Jeffrey A.
Lee Peter F.
Ruehl Charles A.
Weyerhaeuser Company
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