H4-DH-22-D ion for special information Type size Driven ma Helical speed reducers H4

Flender/Flender Gear Units/Helical speed reducers H4

in 0.8.0 Sugar 3.0.0 Ash 0.5.0 Protein 8.0.0 Source : From Ref. 1. Coffee Processing 7 natural fermentation, treatment with alkali, the enzymatic method, and attrition (frictional removal) in machines (Raoeng or Aquapulper). 3.2.3.2 Natural Fermentation The most common method for mucilage removal is natural fermentation. The hydrolysis of pectins is brought about by enzymes that are naturally present in fruits. Fermentationis critical stage in processing and has profound inuence on quality. Fermentation shouldbe controlled so that it is wholly alcoholic and not acetic. The latter type of fermentationcan occur under dry, high-temperature, and high-pH conditions, which usually occur inthe top 1-cm layer of the fermenting mass of wet parchment. This should be preventedas it is likely to cause stinkers and beans producing unpleasant odors and taints. The fermenting mass should not be allowed to dry up and should be kept covered. The mucilage breaks down in the process of fermentation. In the case of . arabica it is complete in about 2 to 3 . Fermentation takes longer in cool weather than inwarmer conditions. Great care is to be exercised at this stage, as otherwise overfermented,sticky mucilage is left on the parchment. This subsequently leads to absorption of moistureby the beans and mustiness in the nal product. When correctly fermented, the muci- lage is removed easily and the parchment does not stick to the hand after washing. The beans feel rough and gritty when squeezed by hand, feeling similar to squeezing pebbles(. When the mucilage breakdown is complete, clean water is let in and the parchmentwashed with three to four changes of water. Fermentation is often carried out in concretetanks (Fig. . Coffea robusta has thicker and more sticky mucilage and hence fermentation is not complete even after 7 . Quite often, the mucilage breakdown is not complete even after very long period. It is, therefore, desirable to resort to warm water treatment, alkali treatme