1. A027_e
Laser-optical displacement sensors
optoNCDT
Automatic paper web control
In paper production the prepared paper pulp flows Technical details
onto a conveyor belt of fine wire mesh at the so- - Measuring range: 100 mm
called "wet end". There most of the water is removed - Accuracy: ± 1 % FSO
by means of a vacuum. The paper web is generated - Resolution: ± 1 % FSO
and is transported to the second station, the wet - Band width: 250 Hz(-3db)
press rollers, which determine the paper web speed - Stand off distance: > 300 mm
by means of a second drive unit. In order to avoid
tears in the paper web a laser position measuring Ambient conditions
system is used here which measures the position of - Temperature: 20 - 40 °C
the paper web between the two stations. The analog - Medium: air
output signal of the sensor is fed into a closed-loop high humidity
control circuit which influences the motor speed at aggressive chemicals
station 1 and thereby ensures that a specified
setpoint distance value is maintained. System configuration optoNCDT
OD1605-200 optical displacement sensor
PS1605 power supply
Option:
4 - 20 mA
Relay output
Protection housing
Reasons for choosing the system
Micro-Epsilon optical displacement sensors mea-
sure reliably, non-contact and precisely. The basic
distance to the paper path is long
Station 2 Station 1
couch roll
sensor with
protection housing
100 mm.
Intendedsuction roll
wet press roll
paper path
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94496 Ortenburg / Germany Fax: 0 85 42/1 68 90 www.micro-epsilon.com Modifications reserved Y9781027