Sugar Refining Robots: Sugarloaves to ABB

Sugar refining turns brown raw sugar from cane, or the juice of sliced beets, into the white crystals in a kitchen jar. For most of its history the work ran on wood fires and human backs. This post follows sugar refining from the conical sugarloaf and the open kettle to Howard's vacuum pan, the centrifuge and the beet factories of Prussia. After that it looks at where robots work in a refinery today, which is mostly at the end of the line where bags are filled, stacked and shipped, and at the ABB robots that fit those jobs now and in the next few years.

A loader moves raw sugar in the storage shed of the Redpath refinery in Toronto, 2010. Photo: Loozrboy / Wikimedia Commons (CC BY-SA 2.0)

From sugarloaves and open kettles to steam and vacuum

Until the late 19th century refined sugar was sold as a sugarloaf, a tall cone with a rounded top. Refiners boiled raw sugar with lime water, filtered it, and poured the syrup into upside down conical moulds of earthenware or sheet iron. The syrup drained out through the tip over several days, and then the hard white loaf was knocked out and wrapped. Europe had loaf refineries in Italy from 1470, England from 1544 and Germany from 1573. At home, people cut pieces off the loaf with sugar nips. Workers carried the moulds and stacked the loaves by hand, often in hot, smoky rooms.

Sugarloaf moulds and a white sugarloaf at the sugar museum in Funchal, Madeira. Photo: Dr. Thomas Liptak / Wikimedia Commons (CC BY-SA 4.0)

The first big change was about heat. In 1813 the British chemist Edward Charles Howard came up with a way to boil sugar liquor in a closed vessel heated by steam and kept under partial vacuum. At lower pressure the syrup boils at a lower temperature, so his vacuum pan used less fuel and burned less sugar into caramel. Refineries still use vacuum pans. Later, in Louisiana, Norbert Rillieux built the multiple effect evaporator, in which the steam from one boiling vessel heats the next one, and refining started to look like the chemical engineering it is today.

Vacuum pans and workers at the North Isis sugar mill in Queensland, 1896. Photo: Queensland State Archives via Wikimedia Commons (public domain)

Sugar also stopped being only a tropical crop. Andreas Marggraf showed in 1747 that beets contain sugar, and Franz Karl Achard opened the first beet sugar factory at Kunern in Silesia in 1801. Napoleon's embargoes kept cane sugar out of Europe and pushed beet factories across Prussia and France. Later in the 19th century, centrifuges replaced slow draining: a spinning basket threw the syrup out through a screen and left clean crystals behind. The machines kept getting bigger, but people still shovelled the sugar, filled and sewed the sacks and carried them on their backs. A Brooklyn refinery owned by the Havemeyer family employed up to 4,500 workers at its peak in 1919.

Centrifuges in a beet sugar factory around 1900. Photo: Unknown photographer via Wikimedia Commons (public domain)

Where robots work in a sugar refinery today

Automation reached the boiling house first, as control systems that now run pans, evaporators and centrifuges from a control room. Robots arrived later, at the packing end. New plants are still going up. On 16 September 2026, St Vincent Times reported that Caribbean Sugar Refinery, a joint venture of Sucro and Santander Sugar, said "first sugar" at its new Belize refinery was targeted for the third quarter of 2026, with full commissioning in the fourth quarter. The plant is meant to supply refined white sugar to buyers across the Caribbean, and like any refinery it will need lines that bag and stack its output.

A high grade vacuum pan in the boiling house of the Kekaha Sugar Company mill on Kauai, recorded in 2008. Photo: David Franzen, HAER / Library of Congress via Wikimedia Commons (public domain)

Palletizing sacks is the most common robot job in a sugar plant. The sacks are heavy, the line runs around the clock, and each customer can want a different stacking pattern. ABB's IRB 460 is a four axis robot built for end of line and bag palletizing, and the larger IRB 660 can carry up to 250 kg. Packaging World reported that Michigan Sugar replaced a mechanical palletizer with a robot at its Sebewaing beet plant in 2010; that robot was not an ABB machine. For more examples, see these ABB robot use cases and the post on truck unloading and palletizing.

An ABB IRB 660 robot stacking bags of Lucchetti pasta on a pallet at Molinos in Argentina. Photo: Eduardo Gil / ABB

Smaller formats need speed more than strength. Sticks, sachets and sugar cubes go into cartons at high rates, which is the kind of picking the ABB IRB 360 FlexPicker delta robot does in many food plants. Refinery laboratories also test samples for colour, moisture and purity on every shift. ABB has shown a mobile YuMi concept that loads a lab centrifuge and handles test tubes. Using something like it for sugar samples is a possibility; we did not find a refinery doing it. Cells of this kind are usually laid out and tested first in RobotStudio before anyone bolts a robot to the floor.

ABB's mobile YuMi concept loading a laboratory centrifuge. Photo: ABB

What comes next for sugar refining robots

In factories, the next step is fewer manual touches between the centrifuge and the truck. Retailers want mixed pallets with different bag sizes on one pallet, and a robot can change its pattern far more easily than a fixed mechanical palletizer. Autonomous mobile robots such as ABB's Flexley Mover could move pallets and sample racks between the packing hall and the warehouse, and cameras can check bag seals and labels before a sack reaches the stack. Most of this already runs in other food plants, from flour mills to pasta factories, so sugar packers can copy cells that have been proven elsewhere.

The centrifuge station of the Boedoeran sugar factory on Java around 1925 to 1930, with sacks filled under a rotating sieve. Photo: Rijksmuseum via Wikimedia Commons (CC0)

Some problems are still open. Sugar dust is sticky and can explode, so robots near open product need hygienic designs and sealed joints, and in some zones they need equipment approved for hazardous areas. Beet campaigns run hard for a few months and then stop, which makes expensive automation harder to pay back. Small cane mills in developing countries have cheap labour and little capital. Every plant that adds robots also needs technicians who can program and repair them, and those people are hard to hire.

An ABB IRB 660 palletizer stacking cartons at the end of a packing line. Photo: ABB

At home, robots will not refine sugar, but some already handle it. Coffee robots and dessert kiosks scoop and dose sugar, and kitchen robots are learning to measure ingredients. In factories, the likely path is that new refineries such as the Belize plant will have robots on the packing lines from the start, while older plants add them one palletizing cell at a time. Carrying and stacking sacks, the job that wore out refinery workers for generations, is the job robots are taking over first.

A worker on a stack of refined sugar bags in Ensenada, Puerto Rico, 1942. Photo: Jack Delano via Wikimedia Commons (public domain)

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