Apparatus for measuring the state of formation of a sheet of pap

Details Apparatus for measuring the state of formation of a sheet of pap Apparatus for measuring the state of formation of a sheet of pap

1985-07-12

1987-11-17

Alvo, Steve

Paper making and fiber liberation

Apparatus

Electric controls or systems

162263, 356366, 356367, D21F 700, D21F 706

Patent

active

047072237

ABSTRACT:
This invention relates to an apparatus for continuously measuring the state of formation of a sheet of paper which comprises: --means for moving a sheet of paper at a predetermined speed; --a light source directing a laser beam through said sheet; --a means for picking up the laser light transmitted, then for converting it into an electrical signal; --electronic processing means for separating this electrical signal into two components; --means for calculating from these components the index I representative of the state of formation; --a means for displaying the value of this index I; wherein the laser beam is polarized, and the apparatus further comprises, between the sheet and the means for picking up the laser light transmitted, a polarizer of which the axis of polarization is perpendicular to the axis of polarization of the laser beam transmitted.

REFERENCES:
patent: 3525871 (1970-08-01), Lehtinen
patent: 3807868 (1974-04-01), Simila
patent: 4266142 (1981-05-01), Crawford
patent: 4555177 (1985-11-01), Barrett
patent: 4586820 (1986-05-01), Yokoyama et al.
Andersen; "An On-line Inspection Device", TAPPI, vol. 62, No. 6, Jun. 1979, p. 69.

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