Food plant expansion sustained by central robotic palletising system

Unilever is one of the world’s leading FMCG companies with sales in 190 countries and products used by 3.4 billion people every day. Its nutrition factory in Ploiesti, Romania manufactures products for one of the company’s most well-known brands, Knorr.

The entire dry nutrition range includes meal makers, dish and sauce bases, and seasonings among others, in various packaging formats: pouches, bags, cartons and multipacks. These different product lines also handle a large variety of secondary packaging options — American boxes, tray and hood, tray and shrinking foil, and shelf-ready packaging.

Unilever Ploiesti’s production capability has gradually evolved. Volumes have tripled from 12,000 tons per year to 35,000 tons per year; SKUs have risen from 200 to 1000; packaging lines increased from 14 to 28; and personnel has jumped from 200 to 700. It was no longer feasible to utilise the factory’s existing end-of-line system to manage the breadth of brands packed onsite. Unilever Ploiesti has therefore invested in a new central palletising solution.

Sidel installed a centralised palletising system comprising eight robotic cells; several hundred metres of case and pallet conveyors; four pallet handling shuttles; and two stretch wrappers, achieving a production rate of up to 98 pallets an hour. The consolidated system is connected to 28 packing lines.

The robotic cells are divided into two separate clusters — one with five robots, and the other with three. Each cluster has one central pallet magazine for all pallet types and sizes, one induction shuttle for full pallet discharge and one compact shuttle for empty pallet delivery integrated underneath the robotic islands.

According to the capacity of each packing line and the palletising pattern requested, the cells have three or four product infeeds, ensuring a robot utilisation rate of 92%.

Unilever’s masterplan for the Ploiesti site was to keep the palletisation space in a separate area from the packing hall to easily accommodate the recurring packing line modifications. To connect the two areas, Sidel proposed a high-level conveying solution with spiral elevators to save space, facilitate circulation and increase the overall flexibility linked to site transformations.

“We’ve been impressed by Sidel’s design capability to fit the detailed palletising specifications we required in a compact area and simultaneously oversee the complexity and high throughput coming from the packing lines,” said Iuliana Popescu Colt, Operations Manager at Unilever.

Sidel was able to demonstrate its proposed arrangement using virtual reality glasses, allowing Unilever to visualise the full installation, check the space constraints and solve potential issues related to platforms, the operators’ access and the raw material flows. Speed simulations also helped to confirm the speed levels and the robot utilisation rate.

After the design phase, Sidel’s project management spanned from factory acceptance testing to site installation. All eight robot cells were completed in less than eight months. The modular concept accelerated installation as each cell was commissioned individually and at once integrated into the factory’s live packaging operations.

“Spending a little bit more time in design and simulations helped during the installation phase. The virtual model fitted exactly in the physical space, so that we achieved the desired throughput in a very short time,” said Laurentiu Badulescu, Technical Manager at Unilever.

The central palletising system is integrated in the Unilever digital process. As soon as the operator selects the production order from the packing line, all the information related to the palletisation, including pallet size, type of pattern, number of rows/layers, and the label to apply is all automatically set and transmitted to the corresponding palletising cell and the entire end-of-line setup.

“This was a complex project; however, the solution developed by Sidel is based on standard proven modules, which have been developed and implemented in other projects,” Badulescu said. “Sidel has combined them in a smart way to deliver a custom solution, avoiding any complex start-up issues brought by a made-to-order one-shot solution.”

Originally published here.