How is NFC technology applied to PVC keychains

Shenzhen Dianchen Technology has made a breakthrough by embedding NFC chips into PVC soft rubber keychains

How is an NFC chip applied to a PVC keychain?

The application of NFC chips in PVC keychains can be regarded as a perfect combination of material science and wireless communication technology. Simply put, it is because NFC chips are tiny and battery-free, while PVC material can protect them well without hindering signal transmission

The NFC chip Classic S50 is commonly used for ordinary access control or bus cards

Choose DESFire EV3 for higher security

The Ultralight AES series chips are suitable for disposable tickets or event tickets

NXP 213/215/216 is suitable for smart tags or business cards

Core component: The "talent" of NFC chip

Passive characteristic (battery-free): The NFC chip itself does not have a power source and is completely passive. It receives electromagnetic waves emitted by a reader through its antenna and converts them into instantaneous electrical energy to operate. This is similar to wireless charging, so there is no need to install batteries in the keychain, making it very compact and lightweight.

Tiny physical size: The core NFC chip and antenna can be made extremely small, with the chip typically the size of a rice grain and the antenna being an extremely thin coil surrounding the chip. With such a small size, it can be easily encapsulated into any PVC molding mold.

Perfect partner: The "assistance" of PVC material

PVC (polyvinyl chloride), a common plastic, serves as the most ideal "protective shell" for NFC chips:

Good signal penetration: PVC is a non-metallic material that almost does not produce any blocking or shielding effect on NFC radio frequency signals at a frequency of 13.56 MHz. This ensures that the keychain can be easily recognized by the reader no matter how it is rotated, and the signal can "penetrate through walls".

Durable and Waterproof: PVC material boasts excellent flexibility and impact resistance, safeguarding the fragile internal chips and antennas from damage or breakage during daily use. Additionally, through processes such as ultrasonic welding, the chips are fully encapsulated within the PVC, ensuring waterproof and dustproof effects, making it highly durable.

Easy to shape and beautify: PVC can be molded into any desired shape through molds, whether it's a brand logo, cartoon character, or other creative designs. Its surface also supports exquisite color printing, allowing QR codes, patterns, text, and more to be directly printed onto it

Key process: How to "insert" the chip

Putting a chip into a keychain is not just a simple matter of stuffing it in, but involves a mature manufacturing process:

Injection molding/compression molding: Initially, liquid or softened PVC material is injected through precise molds to form the main body of the keychain, with a cavity reserved inside for placing the chip and antenna.

Implanting the chip: Precisely place the NFC chip and the antenna coil connected to it into the reserved cavity. To ensure the stability of the chip, epoxy resin is sometimes filled for reinforcement.

Encapsulation and fixation: Finally, through techniques such as ultrasonic welding, the various parts of the keychain are firmly pressed together to form a sturdy whole. At this point, the chip is completely encapsulated inside, neither visible nor tangible, yet fully functional

The NFC chip can be applied to PVC keychains, essentially leveraging the "passive" and tiny characteristics of the chip, as well as the "protective" and "signal-transparent" properties of PVC material.