1. A037_e
Laser-optical displacement sensors
optoNCDT
Rebound behaviour of the felt
In paper production the paper web is transported Technical details
over a felt from the screen station to the pressing - Measuring range: 10 mm
station. This felt removes the residual moisture from - Accuracy: 0,01 mm
the paper. For water separation the felt passes a - Resolution: 0,01 mm
defined gap between the central and the suction - Band width: 10 kHz (-3 dB)
roller. The wear and the rebound behaviour of the felt
determine the hygroscopy and are thus of decisive Ambient conditions
importance for the paper quality. - Temperature: up to 40 °C
Laser-optical position measuring systems monitor - Medium: - splash water
the wear at a guide roller. Measuring with two sensors - high humidity
compensates the ovality / stroke of the guide roller.
The result of the measurement is the effective Reasons for choosing the system
thickness of the felt. If the measured value falls below - Non-contact displacement measuring
the specified limits of wear, the production can be - small spot diameter
stopped and the felt can be replaced. Because of the - long stand off distance
difficult environmental conditions the sensors are - High accuracy
installed in a protective housing. - High frequency response
Roller
Plastomer film
Felt
approx. 1.200 m/min
Sensor Sensor
1 2
Tension
situation
Guide roller
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