Coffee Hulling Process: How to Hull Coffee Beans at Home

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Coffee Hulling Process

The coffee hulling process is a stage of coffee production that you may have not heard of before. However, it’s not a new thing and has a long history. Hulling can be done in all processing methods (wet, semi-dry, and dry), having a different result in each. Once, it was a manual process, but today, hulling is automatically handled by machines known as hullers.

If you are interested in coffee production stages, the history of coffee hulling, and different types of coffee hulling based on the processing method, or you are just a coffee lover, this article is right for you!

The history of coffee hulling

Hulling is one part of the coffee production process. In fact, it is a part of the milling process which is very important in coffee making. The first coffee hulling machinery was patented in 1894, by C.E Lip as one of his many helpful inventions.

huller machine separates and cleans the coffee berries and makes the hulling process easier. This machine, being the first of its kind, completely changed the way that coffee was produced. it resulted in a rise in coffee production and the finer accuracy of the hulling process.

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In which stage of coffee production is the coffee hulling process done?

The coffee hulling process is an optional step in coffee production. Usually, coffee hulling is one of the last stages of coffee processing. it is usually done after milling and before polishing, but some believe it is a part of the milling process or skip the polishing step and directly go to the cleaning and sorting stages.

What is the Coffee Hulling Process?

What do they do in the coffee hulling process?

During the coffee hulling process, the “pergamino”, the parchment skin of coffee beans, is removed.  The pergamino is a naturally occurring, papery substance surrounding the coffee bean. It is just like the membrane-like layer that surrounds many other types of fruits seeds and is called the endocarp. It is optional whether to hull away or not the parchment and some coffee beans are sold “en pergamino” (in parchment).

What are the different kinds of coffee hulling processes?

After drying the coffee beans in the sun or a drying machine, the parchment skin gets crumbly and dry, so it is easy to remove. The layers that are removed from coffee beans in the hulling process depend on the coffee processing method used. Here we will talk about the removed layers in each method.

If a wet process method is being used, the coffee hulling process removes the dried husk that surrounds the coffee bean. This husk surrounding includes the exocarp, mesocarp, and endocarp.

What is the Coffee Hulling Process?

In the semi-dry processing method, hulling also removes dried mucilage along with the husk from the coffee bean.

In the dry processing method, a leathery covering is removed from coffee beans during the hulling process. This leathery layer includes the husk, the mucilage, and other plant material.

No matter how many layers are to be removed in hulling, it always takes place in just one step.

How is the coffee hulling process done?

As we said before, the coffee parchment is removed using a huller machine. There are many different huller machines available. They can be simple milestones or very advanced machines that tap away at the coffee to remove the hulls. Regardless of how simple or complex the huller machine is, the basic operation is alike; the huller machine abrades the hull until it crumbles away.


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