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Wine Press

Tuesday, February 06, 2007

A wine press is a device used to extract juice from crushed grapes during winemaking. There are a number of different styles of presses that are used by winemakers but their overall functionality is the same. Each style of press exerts controlled pressure in order to free the juice from the fruit. The pressure must be controlled in order to avoid crushing the seeds and release a great deal of undesirable tannins into the wine.

Press Types

A basket press consists of a large basket that is filled with the crushed grapes. Pressure is applied through a plate that is forced down onto the fruit. The mechanism to lower the plate is often either a screw or a hydraulic device. The juice flows throw openings in the basket. The basket style press was the first type of mechanized press to be developed, and its basic design has not changed in nearly 1000 years.

A horizontal screw press works using the same principle as the basket press. Instead of a plate being brought down to put pressure on the grapes, plates from either side of a closed cylinder are brought together to squeeze the grapes. Generally the volume of grapes handled is significantly greater than that of a basket press.

A bladder press consists of a large cylinder, closed at each end, into which the fruit is loaded. To press the grapes, a large bladder expands and pushes the grapes against the sides. The juice then flows out through small openings in the cylinder. The cylinder rotates during the process to help homogenize the pressure that is placed on the grapes.

A continuous screw press differs from the above presses in that it does not process a single batch of grapes at a time. Instead it uses an Archimedes' screw to continuously force grapes up against the wall of the device. Juice is extracted, and the pomace continues through to the end where is it extracted. This style of press is not often used to produce table wines, and some countries forbid their use in higher quality wines.
Source: EncycloWine




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