Web Position Sensor is an affordable vision sensor which can be used for edge, line, contrast sensing, marking detection among others.
Edge Detection Sensor
One of the most common application for the Roll-2-Roll® Sensor is the edge detection application. The sensor can accurately detect the edge position of a web or any object irrespective of the material properties. Whether it is opaque, transparent, porous or nonwoven, the Roll-2-Roll® Sensor can accurately measure the web edge position without the need for any calibration. The infrared sensor is an ideal solution for all web edge detection and web guiding needs.
Edge position measurement has applications in:
- Web edge detection for web guiding applications
- Carpet edge detection
- Stack position detection
- Sheet alignment detection
- Leading edge detection in electronics manufacturing, etc.
Width Measurement Sensor
Apart from edge position measurement, the Roll-2-Roll® Sensors can also be used for width measurement and monitoring. For example, from the position of two edges of a web the web width can be determined. Web width measurement can be used to monitor the width of a laminated web, folded and glued web, folded sleeve, blown film extrusion width monitoring, etc.
Width measurement has applications in:
- Web width measurement
- Slit trim width monitoring
- Manufactured parts inspection
- Rod diameter verification
- Bottled cap presence/absence detection
String or Thread Detection Sensor
The highly accurate sensor technology also enables detection of very thin object such as a string or a thread. The position of the string can be accurately measured with high precision. The sensor can also be used to detect the presence of one or more strings, count the number of strings, measure the distance between two strings, or the distance between the first and the last string, or the distance between consecutive strings.
Contrast Position Sensor
The Roll-2-Roll® Sensors not only detects the edge position but also the position of a contrasting feature on the web. A visible light source (white LED) is used to pick up a change in visible contrast on the material. Using different operating modes, various transitions in contrasts can be picked and measured by the sensor. The contrast can be a transition from light to dark or from dark to light.
The application for contrast position sensing include:
- Contrast guiding based on a contrasting edge on the web
- Line guiding based on a contrasting line on the web
- Trim width monitoring on printed webs
- Coating width monitoring, etc.
Mark Detection (Visible or UV) Sensor
Contrasting marks such registration marks or defect marks can be detected using the Roll-2-Roll® Sensor. Both visible and UV florescent marks can be detected by the sensor. The contrasting make can be a dark mark on the a light web or a light mark on a dark web.