GuardiolaMechanical dryers are used as an alternative to sun-drying coffee on a patio, either due to poor weather, or when the patio does not have enough capacity. It... is a term for a drum type coffee dryer, that brings down the moisture level over a period of 3 days or so. It is used as an alternative to patio drying in the sun for wet-process coffees still in parchmentGreen coffee still in its outer shell, before dry-milling, is called Parchment coffee (pergamino). In the wet process, coffee is peeled, fermented, washed and then ready for drying.... It is considered better than the vertical dryers. Input heat temperature should be around 50 centigrade.