Method and apparatus for determining the polymer content of a ce

Details Method and apparatus for determining the polymer content of a ce Method and apparatus for determining the polymer content of a ce

1995-02-21

1997-04-08

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2502521, 250304, G01N 2135, G01N 2131

Patent

active

056190387

ABSTRACT:
A method and apparatus for determining and adjusting the polymer content of a cellulose/polymer blend prior to use in a paper-making machine. The method for evaluating a desired polymer contained in a cellulose/polymer mixture comprising the steps of acquiring a sample for evaluation from a cellulose/polymer mixture, dewatering the sample, shredding the dewatered sample, evaluating the shredded sample over the range of absorptances which correspond to the absorption characteristics of the desired polymer, determining a specific wavelength within the range which corresponds to a location of maximum absorbence and of low sensitivity with respect to spectral shifts, comparing the specific wavelength determined with standardized wavelengths representative of known polymer percentages, and determining the polymer content by selecting the standardized wavelength which best corresponds to the specific wavelength determined. The apparatus for evaluating a desired polymer contained in a cellulose/polymer mixture comprising a sampler, a agitator, a dewaterer, a shredder, a near-infrared spectrometer, a discriminator, a comparator and a selector.

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patent: 3764463 (1973-10-01), Histed et al.
patent: 4006358 (1977-12-01), Howarth
patent: 4607955 (1986-08-01), Corbett
patent: 5069753 (1991-12-01), Nishi
patent: 5104485 (1992-04-01), Weyer

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