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CGI Zuverlässige Erkennung von Etiketten mit optischer Etikettengabel

Reliable Label Recognition

Labels can be accurately detected with optical and ultrasound-based label recognition sensors. The solutions are suitable for different label materials and are used in applications in the packaging industry, food industry and logistics.

The Benefits

Reliable detection of labels of a wide range of materials

Quick and easy sensor configuration

Precise label recognition even at high conveyor speeds

Product Portfolio Label Sensors

Optical Label Sensors

Suitable for high belt speeds during ongoing operation

Economical and cost-effective solution

Compact format for easy integration into existing systems

High reproducibility with an accuracy of ±0.05 mm

Reliable recognition of both thin and thick labels

Ultrasonic Label Sensors

Ideal for transparent and very thin labels

Two independently switchable outputs for flexible integration

Very fast response time of only 0.25 ms

Easy cleaning thanks to integrated blow-out hole

Fast initial startup using wTeach software

Functional Principles of Label Sensors

An optical label sensor works with infrared light. An emitter and a receiver form a forked sensor, with the receiver measuring the light intensity. When passing through a label, light is partially absorbed or scattered. This makes it possible to distinguish reliably between the label material and the label.

With ultrasound-based recognition, a sensor emits ultrasonic waves, which are evaluated by the receiver. The signal changes due to different sound attenuation of the materials. This technology is particularly suitable for metalized films and transparent and paper labels.

Application Examples for Label Recognition

Glossy Label on Label Material

CGI Glänzendes Etikett auf Trägermaterial

Challenge: Glossy labels create strong reflections, reflecting back the light emitted by the sensor.

Solution:

Ultrasonic fork sensors detect labels regardless of color, transparency or surface finish. Glossy materials are not a challenge.
Reflex gloss sensors can be used if there is sufficient difference in gloss between the label and the label material.

High Contrast Between Label and Label Material

CGI Hoher Kontrast zwischen Etikett und Trägermaterial

Challenge: Labels and label material often differ significantly in color or brightness. These contrast differences must be reliably detected even at high line speeds and changing material batches.

Solution:

Optical label sensors detect even slight changes in light intensity and enable reliable label detection.
Ultrasonic label sensors detect labels regardless of color and contrast based on different sound attenuation.
Contrast, color and gloss sensors enable precise detection of differences in brightness, color and surface.

Low Contrast Differences Between Label and Label Material

CGI Geringe Kontrastunterschiede zwischen Etikett und Trägermaterial

Challenge: The optical properties of the label and the label material are almost identical. Small differences in reflection and light transmission make it difficult to reliably detect the edge of the label.

Solution:

Ultrasonic label sensors detect labels regardless of their optical properties based on the different sound attenuation between the label and the label material.
Optical label sensors detect even the smallest changes in the received light signal and enable reliable detection.

Selection Aid for Choosing the Right Sensor for Every Label Application

Both the label and the label material are crucial for selecting the right sensor. In addition to optical and ultrasound-based sensors, other sensor technologies such as color or gloss sensors may also be suitable, depending on the application. Our overview helps you find the right solution quickly.

Label	Contrasting	Glossy/metal	Transparent	Luminescent	Colored
Label medium	Bright	Bright	Transparent/bright	Bright	Bright
Label fork (optical)
Label fork (ultrasound)
Fiber-optic sensors
Gloss sensors
Contrast sensors
Color sensors
Luminescence sensors


Label Label medium	Contrasting Bright	Glossy/metal Bright	Transparent Transparent/bright	Luminescent Bright	Colored Bright

Label Label fork (optical)	Contrasting	Glossy/metal	Transparent	Luminescent	Colored

Label Label fork (ultrasound)	Contrasting	Glossy/metal	Transparent	Luminescent	Colored

Label Fiber-optic sensors	Contrasting	Glossy/metal	Transparent	Luminescent	Colored

Label Gloss sensors	Contrasting	Glossy/metal	Transparent	Luminescent	Colored

Label Contrast sensors	Contrasting	Glossy/metal	Transparent	Luminescent	Colored

Label Color sensors	Contrasting	Glossy/metal	Transparent	Luminescent	Colored

Label Luminescence sensors	Contrasting	Glossy/metal	Transparent	Luminescent	Colored

Sectors that Use Label Recognition

Food industry

Logistics

Packaging industry

Automotive industry

Woodworking industry

Recycling

Electronics industry

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