What Is a Label Sensor? Complete Guide You Need to Know

What is a Label Sensor？

 In the modern automated packaging and labeling industry to achieve reliable detection and precise positioning of the label, label detection sensor is the best solution. The label sensor is a detection device used to identify the position, spacing or existence of the label. 

  Label detection is used to detect the physical presence, color and shape of the label to determine whether it is ready for processing.   It is usually installed on an automatic labeling machine, packaging machine or cutting machine to ensure that each label is affixed at the correct time and location.

  The Gtric sensor is designed to ensure accurate label distribution of various materials including paper, metal and transparent labels. With three different technologies of optics, ultrasound and capacitance, these sensors can meet the diverse label requirements. So as to optimize efficiency and reliability. 

• Reflective Photoelectric Sensor suitable for identifying transparent or translucent labels by reflected light. 

• Capacitive Proximity Sensors use dielectric constant difference to detect plastic or paper labels. 

• The ultrasonic tag sensor identifies the thickness change through the acoustic wave penetrating the material and is used to identify some composite materials and metallized film tags.

Why Use Label Detection?

  On traditional production lines, workers rely on visual and manual positioning for labeling.   When the production line speed reaches hundreds of pieces per minute, manual detection will face problems such as high cost and high failure rate. The label detection sensor is important.

  The automatic detection system can work synchronously with the labeling machine, and can still stably identify the label position at high speed, which greatly improves the production efficiency.

  The sensor can identify small optical or physical differences. Even transparent or metalized labels can accurately determine the edge position.

  When the label position is accurately identified, the phenomenon of ‘ missing labeling ‘ or ‘ repeated labeling ‘ can be significantly reduced, and material waste and manual adjustment can be reduced.

The Working Principle of Label Detection Sensor

1. Photoelectric Detection 

  This is a way to use the change of light to detect the position or existence of an object. When the light emitted by the light source is reflected, blocked or transmitted by something, the receiver will produce corresponding electrical signal changes.
  The advantages of fast response, high precision and non-contact are suitable for detecting transparent, non-transparent, different colors, liquids and object labels on high-speed transmission lines.
  According to the classification of through-beam, reflection and diffuse reflection, the labels of different materials and different application scenarios are divided into three types of sensing technology. Common sensors are: 

• Through-beam photoelectric sensor 
• Reflective photoelectric sensor 
• Diffuse reflection photoelectric sensor

2. Capacitance Detection 

  By detecting the change of capacitance value between the label and the base paper, the position of the object or the existence of the label can be identified.
  It is based on the principle that the capacitance value is related to the distance of its medium. And suitable for detecting labels of different materials such as plastic, metallized film and paper.

3. Ultrasonic Detection 

  High-frequency sound waves are emitted by ultrasonic waves to measure the time or intensity reflected back after penetrating the object, so as to determine and distinguish the position, distance and shape of the label.
  It is insensitive to material and light, and is suitable for complex label materials. In other fields, it is commonly used in liquid level measurement, obstacle detection, automatic parking system, thickness measurement and weld detection.

The Features of Gtric Label Sensor

  The  Gtric label sensor is a high-precision sensor designed for automatic labeling, label positioning and detection systems. It can quickly identify the small difference between the label and the base paper, and achieve accurate label positioning .
  And the feature of  high-speed detection is widely used in packaging, printing, food, medicine and other automated production fields.

1. The Gtric label sensor uses advanced photoelectric or ultrasonic detection technology to accurately identify transparent, translucent and opaque labels. Even in the case of very small label spacing or special material, stable detection performance can be maintained.
   
2. The Label sensor has a very short response time and a response frequency of up to 10 kHz. It is suitable for high-speed labeling machine and automatic packaging equipment. Whether it is continuous detection or intermittent labeling, it can maintain accurate trigger signals to ensure the smooth operation of the production line.
   
3. The label sensor adopts high-quality electronic components and durable shell design, with excellent anti-interference ability and environmental adaptability. It can maintain long-term stable operation even in high temperature, high humidity or dust environments.
   
4. The compact size and reasonable structure of the Gtric label sensor make it easy to install on various labeling machines. The sensitivity setting can be quickly completed by simple button or knob adjustment, which greatly shortens the debugging time.

The applications of label sensor

 In short, the label sensor can help you solve the problem of product label quality, even in the case of large product demand, production speed is also competent. We recommend you to learn about the GTRIC brand of photoelectric sensors, which have been recommended and tested by our engineers.