In garment traceability and smart card manufacturing, demand keeps growing for simultaneous multi-area labeling of large RFID cards. However, because web speed is high and the pressing area is large, multi-head parallel operation easily produces bubbles, hurting appearance and read rates. This article addresses this pain point and, based on the technical features of the WZ-125F automatic three-head card labeling machine, provides a systematic troubleshooting and setup guide.

Causes of bubbles in multi-head simultaneous labeling

Bubbles in multi-head simultaneous labeling are mainly caused by three factors:

  • Static attraction:Large card stock easily builds up static during sheet-fed conveying, so air is drawn in at the moment of application.
  • Uneven force:When several labeling heads work at once, differing hardness or pressure of the pressing sponges or silicone rollers prevents air from escaping evenly.
  • Improper speed matching:In high-speed RFID labeling, if the peel angle is too large or the conveying speed changes abruptly, the label cannot extend smoothly and bubbles form in the center or at the edges.

WZ-125F technical analysis and solutions

To address these problems, the Wanzhi Automation WZ-125F was deeply optimized in structure and control. It uses high-accuracy two-side supported labeling heads and an extended one-piece stainless steel frame that suppresses vibration at high conveying speed, holding labeling registration within ±0.5mm and providing a sound physical basis for smooth label application.

On parameter control, maximum dispensing speed reaches 60M/min and overall capacity is about 1000-1400 cards/min. Through the independent industrial touch screen, operators can adjust the pressure and dispensing speed of the 3 heads (or 2 to 6 optional heads) separately. When bubbles appear, fine-tuning each head’s pressing force and delay parameters makes air evacuation more even during simultaneous application, effectively eliminating bubbles.

Setup tips and selection criteria

In practice, check the labeling heads’ pressing silicone rollers for wear regularly and keep the roller surface clean to eliminate static effects. For large cards, reduce the initial labeling speed appropriately, then return to normal capacity once the leading edge of the label is applied smoothly. When selecting the machine, Wanzhi Automation recommends assessing the number of heads according to the card’s label layout; the WZ-125F supports a flexible 2~6 heads and its modular design meets capacity expansion needs at different stages, so one machine serves multiple purposes.

FAQ

1. Why do bubbles tend to form at label edges during multi-head simultaneous labeling?

This is usually because pressing force differs between heads or the pressing rollers are worn, producing uneven force. Check and calibrate each head’s pressure parameters and replace aging pressing silicone rollers if necessary.

2. Does the WZ-125F’s high-speed labeling mode increase the chance of bubbles?

Maximum dispensing speed reaches 60M/min, and at high speed insufficient air evacuation time can indeed produce bubbles. By separately adjusting each head’s labeling delay and pressing force on the industrial PC screen, however, application quality at high speed is maintained.

3. How can the inlay chip inside the label be protected during RFID labeling?

The WZ-125F uses high-accuracy two-side supported heads and runs with little vibration. During setup, make sure the peel plate edges are smooth and set the application mechanism pressure properly to avoid hard squeezing that damages the RFID antenna.

4. If orders increase later, can the number of labeling heads be expanded?

Yes. The WZ-125F uses a modular head design with 3 heads as standard and supports a flexible 2~6 heads, making it easy to scale capacity according to actual process needs.

5. How should overlapping cards and jams in the automatic separating and feeding mechanism be investigated?

First check the wear and tension of the sheet-feeding belt; then adjust the gap of the separating friction wheels so that only one card is separated at a time; finally clean paper dust and dirt from the separating rollers.

Written by Wanzhi Automation