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Onion peeler USM-S100

The Sormac onion peeler USM-S100 combines easy operator use with a good reliability. The operator has within reach a rotating, mounted display panel with all the important functions at there disposal. Also shown is important information like capacity, number of peeled onions, operating hours and malfunction identification.

By means of a singulating chain the onions are transported from the infeed hopper and positioned onto the flights of the transport chain. The operator places the onions in the right horizontal position. The rotating knives top, tail and cutting arms make a horizontal cut around the onions.

At the end of the conveying section the onions are picked up with a double holding-arm system with rotating holders.

This arm is fitted on a rotating structure. During the rotating movement the onion spins around its own axis, whereby a cut over the complete circumference is made. The depth of the cut is also adjustable. During the cutting air is blown into the cut to remove the skin.

For adapting the machine to different onion diameters several adjustments are provided. These can mostly be made from outside, even during operation, by means of a hand wheel.

The Sormac air saving technique which is used in the USM-S100, takes care of low energy consumption in combination with a higher peeling quality.

  • “We have been working together with Sormac now for almost 18 years and now we are ready for the third generation onion peeler. We are only satisfied with the best result, which means that we continue to innovate to retain this level permanently. At Sormac, they understand this better than anybody. For nearly 35 years now, we have been supplying the highest quality peeled onions and this is only possible if our machines get regular updates and operate in an increasingly more modern and efficient way."

  • Mr. Stephan Monaghan, Monaghan Fresh Produce,

Product specification

The USM-S100 can peel onions with a diameter of 2 1/8” – 4 11/16”. For smaller and larger diameters adjusted executions can be supplied (see options).


Depending on diameter, shape, and quality the USM-S100 onion peeler can handle up to 4,800 – 6,000 onions per hour, positioned by one person.


Energy and air saving technology

Up to 40% lower energy and air consumption levels than similar machines.

Ergonomic design at one level

The machine was designed to be on one level so as to make working with, and adjusting, the machine as easy as possible for operators.

Low sound pressure level

During production < 83 dB(A).


Option - inspection table

Directly mounted inspection table

Bordes USM-S100 - Sormac

Operating platform

Waste transportation screw conveyor

Conveyor chains

For non-standard onion diameters (1 1/2″ – 2 13/32″ or 3 3/16″ – 5 7/16″).

Onion peeler USM-S100


Type: USM-S100
Voltage: 230/400 V, 50/60 Hz
Installed power: 2.3 kW 3.1 HP
Dimensions (L x W x H): 5,540 x 1,120 x 2,125 mm / 18’-2.3” x 3’-8.1” x 6’-11.7”
Air pressure requirement:6 bar (dry air) (87 psi)
Air requirements:max. 1.1 Nm³/min (39 cfm) (at 6 bar air pressure)
Noise level:< 83 dB(A)