Apparatus for analyzing the formation of a paper web

Details Apparatus for analyzing the formation of a paper web Apparatus for analyzing the formation of a paper web

1985-09-13

1987-02-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250572, 356430, 162198, G01N 2189

Patent

active

046441743

ABSTRACT:
On-line apparatus for analyzing the formation of a moving web of paper, using a source of light directing a beam through the paper and a photodetector receiving the light which has passed through the paper, has a circuit preferably including a tunable band pass filter and demodulator producing a D.C. output reflecting size and distribution of flocs. The output gives similar results to those obtained by visual judgement of formation.

REFERENCES:
patent: 3114791 (1963-12-01), Zabel et al.
patent: 3135867 (1985-01-01), Daneff
patent: 3469104 (1985-10-01), Hector
patent: 3525871 (1985-10-01), Lehtinen
patent: 3534402 (1985-11-01), Crowell et al.
patent: 3639768 (1972-02-01), Mancini
patent: 3992100 (1976-11-01), Lodzinski
patent: 4019066 (1977-04-01), Lucas
Burkhard et al., "A Formation Tester which Graphically Records Paper Structure", Pulp & Paper Magazine of Canada, p. T319, Jun. 1960.

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