In fresh egg processing and packaging, the quality of traceability labels and brand logos applied to the surface of egg thermoformed trays directly affects product appearance and consumer trust. However, because egg trays are thin and light and come in many sizes, traditional manual or semi-automatic labeling is very prone to label wrinkles, bubbles, and position drift. Improving labeling efficiency and consistency in fresh food packaging has become an urgent challenge for many egg processing plants.

Fresh food thermoformed tray labeling pain points and solution overview

Fresh egg trays are usually made by PET or PS thermoforming, and the flatness of the lid surface is strongly affected by the forming process. During inline labeling, if conveying is unstable or the pressing force is uneven, self-adhesive labels are very likely to wrinkle or drift. In addition, egg trays on the market come in many specifications, ranging from 8-egg to 30-egg packs, and frequent line changeover setup seriously constrains output.

To address this industry pain point, Wanzhi Automation launched the WZ-160 automatic egg tray labeling machine. Custom-developed for flat-surface labeling of fresh food thermoformed trays, it integrates robotic automatic tray picking and loading with automatic stacking and collection of finished products. Combining a high-accuracy flat-surface labeling head with a stable conveying system, it effectively solves the wrinkling and drift problems in labeling thin, light thermoformed trays, providing egg packaging companies with an efficient and stable automated labeling solution.

WZ-160 core technology analysis and specifications

The WZ-160 automatic egg tray labeling machine takes the practical needs of fresh food packaging fully into account in its structural design and technical specifications; its core technical advantages are reflected in the following aspects:

  • Integrated automatic loading and unloading:A robot arm handles automatic tray picking and feeding, with each magazine holding 70 trays (100 with the extended option); after labeling, products are stacked and collected automatically, 50 trays per collection, greatly reducing manual intervention.
  • High-accuracy labeling control:Equipped with a high-accuracy flat-surface labeling head and photoelectric tracking detection, this self-adhesive labeling machine achieves labeling positioning accuracy of ±1mm, with stable output maintained at 25~45 trays/min and a maximum conveying speed of 16m/min.
  • Wide specification compatibility:The conveying width is electrically adjustable, quickly adapting to egg trays from 8-egg to 30-egg sizes, so production can switch specifications without major machine modifications.

Operating tips and selection scenarios

During selection and operation, companies should plan sensibly around their own line layout. The WZ-160 can run standalone or connect to an upstream injection molding line for integrated forming and labeling.

For egg processing plants running mixed specifications on one line, we recommend making full use of the electric width adjustment, using the touch industrial control screen to quickly set the conveying spacing and label dispensing length at changeover. At the same time, given the material characteristics of fresh food traceability labels, we recommend label materials with a flatter liner to further improve labeling yield. The machine is widely used by egg processing plants, fresh food packaging companies, and other operations that need large-batch standardized labeling, helping them reduce costs and increase efficiency.

FAQ

What should I do if labels wrinkle during labeling on the WZ-160?

Label wrinkling is usually related to the label material, dispensing speed, or pressing mechanism. We recommend checking whether the liner of the self-adhesive label is flat, reducing the labeling speed appropriately, and adjusting the sponge or brush pressure of the label smoothing mechanism so the label adheres evenly to the thermoformed tray surface.

How does the machine quickly switch between 8-egg and 30-egg tray specifications?

The WZ-160’s conveying width is electrically adjustable. When switching specifications, simply recall the corresponding parameters on the touch screen, adjust the conveying chain width electrically, and fine-tune the photoelectric sensor position and guide mechanism to complete changeover quickly, without complex manual disassembly.

Can the machine connect directly to an existing injection molding line?

Yes. The WZ-160 supports dual-mode production: it can run standalone, or by adjusting the infeed and outfeed heights it connects seamlessly to an upstream injection molding line for linked automated production from forming to labeling.

This article was written by Wanzhi Automation.