(57) The present invention relates to the drainage channels of a pneumatic press, as utilized
in particular for pressing fruit, grapes and grape derivatives, which comprises a
tubular membrane and a rotating drum.
Associated with the internal surface of the rotating drum are drainage channels of
diverse shape and size, of which the arrangement on the internal surface of the drum
can be semi-circumferential, circumferential, or single or multistart spiral.
The press thus obtained is a totally enclosed vessel in which the product is forced
by the tubular membrane against the drainage channels.
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