How Do Bakeries Slice Their Bread?

The short answer: one machine, one pass, the whole loaf

A bakery does not slice loaf by loaf with a knife. It uses a bread slicing machine that cuts all the slices of a loaf in one pass. The blades sit at a fixed spacing, and that spacing is the slice thickness – which is why bakery bread comes out so even. The machines are electric counter or floor units built for hundreds of loaves; they are covered as products on commercial bread slicers.

How the machine works

The principle goes back to the first machine that sliced bread for sale. Otto Rohwedder's patent US 1,867,377, filed on November 26, 1928, describes several endless bands of thin spring steel, each with a knife edge, running side by side. Neighboring bands run in opposite directions, which the patent says keeps the bread from being crushed or pushed out of place. Adjustable arms move the bands closer together or further apart to set the slice thickness. Fingers on a feed belt push the loaf through the bands, and a delivery belt carries the sliced loaf on to wrapping.

Today's machines are built differently in detail, but the idea is the same: the loaf passes once through a set of blades and leaves as a stack of slices. JAC, a maker of bakery slicers, uses the term “frame slicer” for this type and contrasts it with its Slim Self, a self-service model with a circular blade and a vertical cutting system that, according to JAC, takes much less space than a frame slicer.

Fixed or variable thickness

Bakery slicers come with a fixed or a variable slice thickness. JAC lists, for example:

The machines come as table models or on a trolley and with a cutting width of 45 or 60 cm, and JAC names a removable crumb tray among their features. Even JAC's lever-operated Pico, which the maker calls a manual bread slicer, is a professional machine for bakeries, not a kitchen tool.

Semi-automatic, automatic and self-service

• Semi-automatic: staff place the loaf, and the machine cuts it. On JAC's lever models, a progressive traction lever is meant to reduce the effort.
• Automatic: the machine starts on its own once loaded; JAC calls the feature Automode.
• Self-service: some shops put a slicer on the sales floor so customers can slice their bread when they buy it. JAC lists automatic loaf holding, a touch screen and a removable crumb tray for these models, and locking covers on its New Self.

Why bakeries let the bread cool first

JAC's advice to bakeries is to let loaves cool completely before slicing; slicing warm bread can cause uneven cuts. The same rule applies at home, whatever tool you use – see when to cut sourdough for the timing on crusty loaves.

How this differs from a home bread slicer

A manual bread slicer for the home works the other way round: it cuts one slice at a time. A hand-crank slicer turns a round serrated blade while you push the loaf against a fence; a slicing guide keeps your own knife straight. That is slower, but it lets you change the thickness for every slice and fits on a counter. The bakery-style electric machines sold online are commercial units – the VEVOR bread slicer in our data is listed at 370 W, 120 V and a fixed 12 mm – which is explained on electric bread slicers. All slicer designs side by side are on types of bread slicers, and the story of the first slicing machine is on bread slicer history. If you want bakery-even slices at home, start with the hand-crank bread slicer.