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There are two reasons: Force. Sphere is most resistant shape to crushing. That's why eggs are roughly spherical, and thin shell can support hen's weight, and more. Pressing whole apples would require much higher forces than pressing grounded ones. Efficiency. Grinding breaks peel, and to some extent it also breaks cell walls. It helps juice flow freely. ...


Apples are grinded first because it makes juice extraction and pressing easier. It is the same process with grapes and wine. Grapes are first crushed, macerated and then pressed. It also allows to get some juice to macerate the solids and extract flavor, color, etc. After pressing, the solids usually become compressed hard, making maceration ...

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