G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 3/40 (2006.01) D21F 7/06 (2006.01) D21G 1/00 (2006.01) G01B 7/34 (2006.01) G01L 5/00 (2006.01) G01N 19/08 (2006.01) G01N 3/02 (2006.01) G01N 33/34 (2006.01)
Patent
CA 2077255
A pressure sensitive device, such as a piezoelectric strip (16) or plurality of piezoelectric crystals (32), is or are arrayed along the surface of a roll, preferably in a spiral pattern, extending for one revolution of the roll (12) which is nipped with an- other roll (14). The nip pressure between the rolls, with or without a paper web passing through the nip, produces a signal by the piezoeletric device (16) indicative of irregularities along the nip (N). These irregularities, which can be indicative of variations in the web caliper, roll surface, hardness and other parameters of roll or web quality, are then passed to a monitor (38) for continu- ous read-out of the irregularities or non-uniformities along the face of the roll. Other apparatus, such as signal conditioning means (30) and encoder means (22), can be provided for processing the signals determining the exact axial location along the roll surface of the pressure sensitive device passing through the nip (N) at any given time.
Beloit Technologies Inc.
Ridout & Maybee Llp
LandOfFree
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