Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Patent
1987-02-17
1989-06-20
Alvo, Steve
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
162263, 162DIG6, 250339, D21F 706, G01N 2117
Patent
active
048407062
ABSTRACT:
A modified infra-red scanning gauge used in measuring the moisture content of a paper-web during manufacture or when subject to a coating practice, has a measurement channel and a reference channel. The measurement channel is based on the infra-red absorption spectrum of water which has an absorption band centered on 1.94 microns. The reference channel is conventionally at a wavelength of 1.83 microns where water has previously been considered to be transparent to infra-red or at a wavelength of 1.68 microns. The gauge is intended for measurement of high water content, where at 1.94 microns absorption effectively becomes total thereby preventing measurement being made, and uses a narrow-band filter of 0.03 micron wavelength offset from the peak of the 1.94 micron absorption band in the range 1.76 to 1.87 microns, previously considered stable as regards water content but now disclosed as showing a water-dependent variation at high water contents. In a specific example a 1.83 micron filter is used for the measurement channel and 1.68 micron filter for the reference channel. The modified gauge which may be of the transmission or scatter type has particular use at the wet end of a paper-making machine.
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Measurex brochure "Single-Sided Infrared Moisture Sensor", 1978.
Wallace, "Dryer Section Energy Use Reduced up to 15% with Computer Control", Pulp & Paper (May 1980).
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Measurex brochure "DynaCO Intelligent Sensor 2255", 1980.
Mercer, "Improved Infrared Moisture Measuring Techniques", 1978.
Alvo Steve
The Wiggins Teape Group Limited
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