Winepress

Each style of press exerts controlled pressure in order to free the juice from the fruit (most often grapes).

The pressure must be controlled, especially with grapes, in order to avoid crushing the seeds and releasing a great deal of undesirable tannins into the wine.

Generally the volume of grapes handled is significantly greater than that of a basket press.

[4] A bladder press consists of a large cylinder, closed at each end, into which the fruit is loaded.

[8] The treatment consists of heating the grapes with steam almost to boiling and then submitting them to a strong vacuum.