What is depulping in coffee processing?
Depulping is the removal of the outer skin and fleshy pulp from coffee cherries, leaving the seeds enclosed in their protective parchment layer. It is a key stage in washed and honey coffee processing. After depulping, a sticky layer called mucilage usually remains attached to the parchment.
How does depulping work?
Coffee cherries pass through a mechanical pulper, which separates the skin and pulp from the parchment-covered seeds. Depulping does not necessarily remove all the mucilage: how much remains depends on the equipment and the intended processing method. Some systems combine pulping with mechanical mucilage removal.
Depulping in washed and honey processing
Both washed and honey coffees are depulped, but the remaining mucilage is handled differently.
Washed coffee: After depulping, the remaining mucilage is removed before drying. This can involve fermentation followed by washing, or mechanical removal. The coffee is then dried in its parchment layer.
Honey coffee: After depulping, some or all of the mucilage is deliberately retained during drying. The term “honey” refers to this sticky fruit layer, rather than the addition of honey.
Natural coffee: In traditional natural processing, cherries are dried whole rather than depulped before drying. The dried fruit layers are removed later.
What is the difference between depulping and hulling?
Depulping removes the fresh cherry’s outer skin and pulp. Hulling removes the parchment layer surrounding the coffee seed. In washed and honey processing, the parchment remains around the seed during drying and is removed afterwards. These are separate stages, not interchangeable terms.
FAQ about depulping
Q1: What is removed during coffee depulping?
Depulping removes the outer skin and fleshy pulp of the coffee cherry. The seeds remain enclosed in parchment, usually with a layer of sticky mucilage still attached.
Q2: Does depulping remove the mucilage?
Not necessarily. Standard depulping leaves mucilage on the parchment, although some equipment combines depulping with mechanical mucilage removal.
Q3: Is depulping the same as washed processing?
No. Depulping is one stage within washed processing, not the complete process. After depulping, the remaining mucilage is removed before the coffee is dried in its parchment. Honey coffees are also depulped, but retain some or all of their mucilage during drying.
Q4: Is natural coffee depulped before drying?
No. In traditional natural processing, the whole coffee cherry is dried with its skin and fruit layers intact. These dried layers are removed later.
Q5: What is the difference between depulping and hulling?
Depulping removes the cherry’s fresh skin and pulp, while hulling removes the parchment surrounding the seed. For washed and honey coffees, hulling takes place after drying.