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Ultrasonic Array Edge Detectors

Edge Detectors

Detects Almost Any Web

Originally designed to detect ultra-thin clear film, the digital Ultrasonic Array edge detector can also detect almost any web material including paper, corrugated cardboard, metals, textiles, and most nonwovens. The Ultrasonic Array is also ideal for guiding photographic film, and other light-sensitive materials.

Unlike optical detectors that have light-emitting lamps, LED's, or lasers, ultrasonic detectors will not fog these sensitive materials.

The Ultrasonic Array edge detector can be used for almost any operation that requires increased detection range including edge guiding, centreline guiding, oscillation to reduce gauge-band build-up, positioning one web relative to another, measuring web width, and monitoring edge or centreline position.

Currently, Ultrasonic Array detectors are available in 1.6", 2.4", 6.4", 11.2" and 18.4" detection ranges, with wider ranges in development. The Ultrasonic Array series of detectors are also available in intrinsically safe, Class I Division I models for hazardous applications.

Typical applications for the Ultrasonic Array include Flat Film Extruders, Blown Film Extruders, Flexographic presses, coating lines and any other web equipment requiring an adjustable guide point or the ability to accommodate a wide range of web widths.

How They Work

Multiple pairs of emitters and receivers create beams of ultrasonic energy in the detection area (figure 1). At all times during operation, only two beams are active. The first beam (or blocking beam) locates the edge of the web, and the second beam (or reference beam) monitors the air space adjacent to the web. As changes occur in temperature, humidity, air turbulence, dust build-up, or other factors, the microprocessor in the Micro 4000 NET or Micro 1000 controller dynamically combines the blocking and reference signals to calculate the web's position to a high degree of accuracy.

The normal guide point position is at the centre of the detection range (figure 1). When used with the optional Remote Station, the guide point can be set to any position within this range (figure 2 shows the maximum range limitations for all models). All detectors provide full, dynamically compensated web guiding no matter where the guide point is located.

By using multiple pairs of ultrasonic emitters and receivers in an array, AccuWeb has developed a new line of digital edge detectors that have dramatically larger detection ranges. This patented technology provides up to almost 18.4 inches of guide point adjustment, and eliminates the need for motorised detector positioners.

When used with the optional Remote Station, this system allows an operator to fine tune web position with digital accuracy and repeatability.

Video: Ultrasonic Arrays (0.7Mb).
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