In the production of large cards such as garment RFID hang tags and smart access cards, applying multiple labels at once is key to raising throughput. However, because the card area is large and many heads are involved, quality issues such as wrinkled and misaligned labels are common. Using the Wanzhi Automation WZ-125G automatic four-head card labeling machine as an example, this article explains the causes of common problems and how to troubleshoot them.

Problem analysis: the challenges of multi-head labeling on large cards

When several areas of a large card are labeled, even slight movement of the material during conveying is magnified, which causes labels to shift. In addition, when several heads work simultaneously, if each head’s dispensing speed does not match the conveying speed, or if the pressing mechanism applies uneven force, stress concentrates at the moment of application and wrinkles the label. If the label does not bond tightly to the card surface, trapped air forms bubbles. These defects not only spoil appearance but also reduce RFID chip read yield, so a systematic check of both machine structure and settings is required.

Technical analysis: how the WZ-125G solves these labeling problems

To address these issues, the Wanzhi Automation WZ-125G automatic four-head card labeling machine was optimized at the structural level. To prevent label shift, it uses high-accuracy two-side supported labeling modules that convey fast with little vibration and hold registration within ±0.5mm. To coordinate multiple heads working at once, the WZ-125G supports 2 to 6 heads that can be added or removed and run in parallel, with a maximum dispensing speed of 60M/min. Through the independent industrial touch screen, operators can adjust each head separately, keeping tension and speed closely matched across heads and effectively preventing wrinkles. The machine also covers a wide card range and handles cards 300\600mm in length and width; the one-piece long, heavy stainless steel frame keeps high-speed conveying stable and reduces the likelihood of bubbles at the hardware level.

Practical advice: routine maintenance and setup essentials

  • Clean the pressing mechanism:Clean the press rollers of the two-side supported labeling modules regularly to keep pressing force even and avoid wrinkles caused by uneven local pressure.
  • Check the label liner:Make sure the release force of the label liner is suitable; if it is too high, label dispensing becomes jerky, which can shift labels or create bubbles.
  • Adjust the peel plate:Set the peel plate angle and distance correctly so the label transfers smoothly onto the card surface and less air is trapped, which prevents labeling bubbles.
  • Recall the program:For different batches of large cards, recall the matching program on the touch screen in advance and fine-tune the conveying speed and head parameters.

FAQ

How do we eliminate bubbles at the edges when labeling large cards?

Bubbles are usually caused by uneven pressing or trapped air. Check whether the press rollers are worn or applying uneven force, and increase pressing force as appropriate; also adjust the peel plate angle so the label bonds progressively from one end to the other, pushing air out.

How can label shift be avoided when several heads label at the same time?

Label shift is usually related to conveying vibration or inaccurate head positioning. Make sure the machine stands on a level floor and check that the high-accuracy two-side supported labeling modules are locked. Then calibrate each head’s labeling coordinates through the independent touch screen to confirm registration meets tolerance.

Can the WZ-125G labeling machine handle large cards of different sizes?

Yes. The WZ-125G covers a wide card range and handles large cards 300 to 600mm long and 300 to 600mm wide. When switching card specifications, just recall the stored program on the industrial PC screen and fine-tune the mechanical stops; no complicated machine modification is needed.

Written by Wanzhi Automation