Sheet inspection apparatus and methods providing simultaneous re

Details Sheet inspection apparatus and methods providing simultaneous re Sheet inspection apparatus and methods providing simultaneous re

1987-07-13

1989-01-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

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

250563, 250226, G01N 2186

Patent

active

048018090

ABSTRACT:
Disclosed are sheet inspection apparatus and methods for rapid, repetitive measurement of a quality attribute in each of a plurality of measurement zones of a continuously-manufactured sheet of material, wherein measurement is based on the interaction of one or more radiation wavelength bands with one or more constituents of the sheet. Simultaneous resolution of measurement zones is provided in both scanning and non-scanning applications.

REFERENCES:
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patent: 3965356 (1976-06-01), Howarth
patent: 4224513 (1980-09-01), Casey et al.
patent: 4544271 (1985-10-01), Yamamoto
patent: 4588885 (1986-05-01), Lovoi et al.
patent: 4648712 (1987-03-01), Brenholdt
patent: 4673988 (1987-06-01), Jansson et al.
patent: 4674871 (1987-06-01), Shifrin
patent: 4676647 (1987-06-01), Kikkawa et al.
patent: 4710642 (1987-12-01), McNeil

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