Which sensor works best for transparent film?
Ultrasonic sensing is usually preferred because it does not depend on optical contrast.
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Ultrasonic vs Photoelectric Web Guide
Sensor choice depends on material transparency, surface condition, edge contrast, and machine environment.
When to use ultrasonic sensors
Ultrasonic sensors are useful for transparent films, plastic film, copper and aluminum foil, and materials where optical contrast is unreliable. They detect the material edge using sound rather than visible light.
When to use photoelectric sensors
Photoelectric sensors are common for paper, opaque film, labels, and printed materials with stable edge or line contrast. They are compact and widely used in standard edge guiding applications.
Related KRD products
FAQ
Can photoelectric sensors track printed lines?
Yes, when the printed line or mark provides stable contrast for the sensor.
Can one controller support both sensor types?
Many web guide controllers can support multiple sensor types, but compatibility should be confirmed by model.
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