photoelectric web-aligning sensor and ultrasonic web-aligning sensor

When slitting or laminating film / tape materials, we often use a web-edge aligning device to ensure that the strip always stays in the right position during the process. The most common web-aligning sensors are photoelectric sensors and ultrasonic sensors. Many customers are not sure which web-aligning sensor to choose when ordering a slitting machine or laminating machine. In this article, we will give a brief description of these two sensors.

The principle of the photoelectric web-correcting sensor is to identify and locate the material position by emitting a light beam and detecting the material's blocking of the light beam. When the material deviates from the predetermined position, the light beam is blocked, and the photoelectric sensor sends a signal to the control system, thereby triggering the web-correcting device to adjust the material to return it to the correct position.

The ultrasonic web-correcting sensor emits ultrasonic waves and determines the position of the material based on the received echo signal, thereby realizing web-correcting control of the material. Ultrasonic web-correcting is usually used to locate and control thick materials.

Photoelectric web-correcting has high precision and fast response speed, but is greatly affected by ambient lighting and the transparency and reflectivity of the material itself. For example, ultra-transparent materials or environments with high workshop lighting brightness are not suitable for photoelectric web-correcting. Ultrasonic sensors are not affected by the transparency of materials, so they do not need to be adjusted when used, which is very convenient. They are suitable for edge tracking of airtight materials (such as plastic films, paper, etc.) (not suitable for airtight materials such as cloth, non-woven fabrics, etc.)