In today's era where RFID technology is widely adopted, a challenging issue has always plagued practitioners: when tags are attached to metal surfaces, the signal will be significantly attenuated or even completely lose its effectiveness. The characteristic of metals reflecting radio waves makes ordinary RFID tags appear "blind" in front of metals. The emergence of flexible anti-metal tags has completely changed this situation. It is like an invisible butler, silently attached to metal assets, allowing the originally "silent" metal equipment to speak.
I. What is a flexible anti-metal tag?
In simple terms, a flexible anti-metal tag is a specially designed RFID electronic tag for use on metal surfaces. It utilizes a special flexible material as its substrate and incorporates an electromagnetic isolation layer that resists metal interference.
Differences from ordinary tags:
When an ordinary RFID tag is attached to metal, its reading distance drops sharply from 5 meters to less than 10 centimeters
The anti-metal tag can still maintain a stable reading distance of 2-5 meters on the metal surface
Core structure:
The tag contains a special layer of ferrite or magnetic material, which acts as an "electromagnetic shield" to isolate metal interference from the signal. The tag itself can be bent and can fit onto curved metal surfaces, such as pipes, gas cylinders, tool handles, etc.
II. How to use it correctly?
Step 1: Choose an appropriate location
Give priority to areas with smooth metal surfaces, free from rust and oil stains
Avoid attaching it to welds, depressions, or sharp edges
For cylindrical objects, it is recommended to attach them along the axial direction, rather than wrapping around them
Step 2: Clean the surface
Thoroughly clean the attachment area with alcohol or a dedicated cleaning agent to ensure it is free from dust, grease, and rust. Allow it to dry before affixing. While this step may seem simple, it is crucial for the performance of the label.
Step 3: Attachment operation
Remove the adhesive protective film and avoid touching the adhesive surface with your fingers
Start from one end and apply even pressure with a scraper or finger to remove any air bubbles
For curved objects, gradually fit them with the flexibility of the labels, and do not forcefully bend them
Leave it for 24 hours after attachment to allow the glue to fully cure and achieve optimal adhesion
Step 4: Reading and Writing Test
Test the reading effect using a handheld reader within a distance of 1-3 meters. If the reading is unstable, check whether the tag is warped or has bubbles, or try adjusting the antenna angle of the reader.
III. Key considerations?
1. Surface treatment cannot be ignored
Rust, peeling paint, and oil stains on metal surfaces can affect the adhesion and reading effectiveness of labels. It is not recommended to directly affix labels on severely corroded surfaces. Instead, rust removal treatment should be carried out first or the affixing location should be changed.
2. Avoid excessive bending
Flexible anti-metal tags can be bent, but not infinitely. The bending radius should generally not be less than 5 times the length of the tag. Excessive bending can damage the internal antenna structure and isolation layer, resulting in tag failure.
3. Temperature environment restrictions
The majority of flexible anti-metal tags operate within a temperature range of -20℃ to +85℃. In high-temperature environments, such as steam pipelines and engine components, specialized high-temperature resistant tags are required. In low-temperature settings, regular adhesive may lose its stickiness.
4. Installation spacing requirements
When multiple metal objects are placed closely together, a minimum spacing of 10 centimeters should be maintained between tags. Too close a distance can lead to signal interference, affecting the accuracy of reading.
5. Protective measures
Although labels usually have a waterproof coating on their surface, it is recommended to additionally install protective covers or choose industrial-grade encapsulated labels if they are exposed to acid and alkali environments, oil-contaminated areas, or outdoor sun and rain for a long time.
IV. Common application scenarios?
Gas cylinder tracking: Medical oxygen cylinders and industrial gas cylinders are equipped with curved flexible tags, allowing for full visibility of their circulation trajectories.
Tool management: After metal tools are labeled, their inbound and outbound records are automatically recorded, reducing the loss rate by 80%
Power assets: Power equipment such as transformers and switch cabinets are labeled, which increases inspection efficiency by three times.
Metal shelves: After labeling, the storage shelves are linked with the goods labels to achieve precise location management.
Ⅴ. Frequently Asked Questions?
Q: When the tag is attached to metal, what is the maximum reading distance?
A:Based on the tag size and reader power, the typical stable reading range is 2-5 meters, with some large-sized tags achieving a range of over 8 meters.
Q: Can labels be reused?
A：The adhesive-backed labels will lose their stickiness after being removed and are not recommended for repeated use. If frequent replacement is necessary, you can choose labels with card slots or strap installation methods.
Q: Can it be directly pasted on the painted surface?
A：Yes, but you need to ensure that the paint has good adhesion and won't peel off when the label is removed. It is recommended to conduct a test in an inconspicuous place first.
Flexible anti-metal tags transform metal assets from "management blind spots" into "data nodes". When these small tags are used and maintained correctly, they can exert tremendous value in fields such as industrial production, asset management, logistics, and transportation. A wrench, a gas cylinder, and a motor, once labeled with this unassuming tag, acquire a unique identity in the digital realm. And this is precisely the most fundamental and crucial aspect of the Internet of Things era.
