How is Circular Conveyor Used in Dairy Cup Filling Line in Food & Beverage Processing?

Circular Conveyor in Dairy Cup Filling Lines: How TallMan Robotics Solves Precision Cup Transport and Station Integration

TallMan Robotics | Industrial Automation Blog  •  Circular Conveyor Series

The Cup Transport Challenge in Dairy Filling Lines

Dairy cup filling lines handle a sequence of precision operations on each container. Each cup must stop at a filling station and accept a metered dose of yogurt or cultured dairy product. Then it moves to a topping station for a secondary ingredient deposit. After that, it proceeds through foil sealing, lid application, seal inspection, and date coding. Furthermore, dairy plants run multiple cup formats in a single shift. These include 100 g single-serve pots, 150 g snack cups, and 500 g family-size containers. Consequently, the conveyor system must reposition cups at each station with sub-millimetre accuracy and switch formats without mechanical adjustment. TallMan Robotics solves both requirements with a closed-loop circular conveyor dairy cup filling platform built on individual servo movers.

What Is a Circular Conveyor in a Dairy Filling Context

A circular conveyor routes individual cup carrier pockets around a sealed oval track. Engineers also call this a closed-loop cup filling conveyor or oval track indexing conveyor. Each pocket holds one dairy cup upright. The servo linear motor drive moves every pocket independently at programmable speed and pitch. Therefore, each station on the ring receives a fresh cup at a precisely controlled interval. Moreover, because the track forms a closed loop, empty pockets return automatically to the cup infeed station. This eliminates the return transport belt that straight indexing conveyors require. Consequently, the circular conveyor cup filling machine footprint stays compact even when ten process stations sit on a single ring.

Additionally, the individual mover architecture means the operator adjusts cup pitch, station dwell time, and transfer speed through a software recipe. Therefore, changeover between a 100 mm diameter snack cup and a 70 mm diameter single-serve pot takes under four minutes without tools.

Circular Conveyor vs. Linear Indexing Conveyor for Dairy Cup Filling

Table 1 sets out the key technical differences between a circular conveyor dairy filling line and a conventional linear indexing conveyor.

Table 1 — Technical comparison for dairy cup filling conveyor systems (TallMan Robotics Engineering Reference TM-CC-2024C, 2024; Serac Group product specification, 2024).

Station Layout on the Circular Filling Ring

Because the circular conveyor dairy cup filling line integrates all process stations around one oval track, a single machine handles the complete sequence from cup infeed to outfeed. Table 2 details a ten-station ring layout for a yogurt cup filling and sealing line.

Table 2 — Ten-station layout on a circular conveyor dairy cup filling ring, yogurt and cultured dairy application (TallMan Robotics Application Reference CAR-GD-2024-02, 2024).

How the Carrier Pocket and Servo Mover Work Together

The carrier pocket is a machined stainless steel nest that holds the cup base and lower sidewall. Each pocket mounts on a servo mover block that rides a linear guide rail segment embedded in the oval track. The servo controller positions each mover block at ±0.05 mm repeatability. Therefore, the filling nozzle descends into the cup opening at the same x-y position on every cycle.

Furthermore, the mover block contains a permanent magnet array. The primary coil in the track energises these magnets in sequence to propel the block forward. Therefore, the operator controls the position and speed of each block independently from the others on the same ring. Consequently, one block can dwell at the foil sealing station for 600 ms while adjacent blocks travel at full speed between stations. This independent motion eliminates the fixed-pitch limitation of chain-driven indexing conveyors.

CIP Integration and Hygienic Design for Dairy Environments

Dairy filling lines operate under strict hygienic standards, including 3-A Sanitary Standards in North America and EC 1935/2004 materials compliance in Europe. Consequently, every component that contacts the cup or operates near the product zone must support clean-in-place or clean-out-of-place procedures. TallMan’s circular conveyor uses IP67-rated servo mover blocks with sealed bearing assemblies. Therefore, operators direct pressurised wash water across the track without removing movers. Furthermore, the carrier pockets use electropolished 316L stainless steel and attach to the mover block with a quarter-turn fastener. A technician removes, sterilises, and replaces all pockets in under fifteen minutes during a scheduled CIP window. Additionally, the open-frame aluminium track extrusion contains no enclosed cavities, so wash solution drains fully without pooling.

Net Weight Control and Fill Accuracy at Station Level

The fill weight check station at position five on the ring uses a load cell mounted beneath a free-floating guide rail section. The cup carrier rolls onto this weigh bridge at reduced speed. Then the load cell captures the gross weight over a 100 ms dwell window. The servo controller subtracts the tare weight of the cup and carrier pocket from the gross reading. If the net fill weight falls outside the recipe tolerance band, the controller flags that mover ID. Then the outfeed gate at station ten diverts the non-conforming cup to a reject lane instead of the case packer.

Moreover, the controller logs fill weight data for every cup against the mover ID and time stamp. Therefore, line supervisors trace any fill drift to the specific piston filler or depositor nozzle that caused it. This traceability supports dairy plant quality management systems under FSSC 22000 and BRC Food Safety certification requirements.

Industrial Application: Yogurt Cup Filling Line, Hebei Province

A mid-volume yogurt producer in Hebei province, China, installed a TallMan circular conveyor dairy cup filling line in Q1 2024. The plant fills three SKUs: a 100 g plain yogurt pot, a 150 g fruit-layer pot, and a 500 g stirred yogurt tub. Before installation, the plant ran two separate linear indexing filling lines for small and large cup formats. After installation, one TallMan circular conveyor ring handles all three SKUs. The ring carries ten stations and measures 9.6 m × 3.0 m. The servo recipe system switches between the 100 g and 150 g pot recipes in 3.5 minutes. Furthermore, the volumetric piston filler at station three holds fill accuracy to ±0.5 g across all three formats. The IR fill inspection camera at station eight achieves a seal detection rate of 99.98% on a 35,000-cup production run, per the plant’s own quality audit log (TallMan Robotics CAR-HB-2024-01).

Source: TallMan Robotics Customer Application Report CAR-HB-2024-01, Hebei Yogurt Producer Circular Conveyor Cup Filling Line, Q1 2024.

Conclusion

The circular conveyor dairy cup filling line from TallMan Robotics integrates ten process steps into one compact closed-loop platform. These steps span cup infeed, multi-component filling, foil sealing, lid application, seal inspection, and date coding. Furthermore, the independent servo mover architecture gives dairy producers format flexibility and fill accuracy that linear indexing conveyors cannot match. Therefore, for yogurt, kefir, and cultured dairy plants that run multiple SKUs on a single post-pasteurisation filling line, the TallMan circular conveyor cup filling system delivers hygienic, precise, and format-flexible cup handling from de-nester to case packer outfeed.

References

1. TallMan Robotics Engineering Datasheet TM-CC-2024C: Circular Conveyor Oval Track — Dairy Cup Filling Configuration, Servo Mover Specifications. Shenzhen: TallMan Robotics Limited, 2024.
2. TallMan Robotics Customer Application Report CAR-HB-2024-01: Yogurt Cup Filling Line, Hebei Province. Internal reference, Q1 2024.
3. Serac Group. (2024). Yogurt Cup Filling Machines — Volumetric and Net Weight Technology Product Overview. Le Mans: Serac Group SAS. https://www.serac-group.com/serac-worldwide/filling-machines-for-yogurt-in-cups-and-bottles-us-canada/
4. 3-A Sanitary Standards, Inc. (2019). 3-A Sanitary Standard for Conveyors and Conveyor Components, Number 41-03. McLean, VA: 3-A SSI.
5. Hygienic Design in Food Processing Machinery: Conveyor Systems and Material Compliance. Journal of Food Process Engineering, 43(8), e13449. https://doi.org/10.1111/jfpe.13449
6. Food Safety System Certification (FSSC). (2023). FSSC 22000 Version 6 — Food Safety Management System Requirements for Food Manufacturing. Gorinchem: FSSC Foundation.