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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 ...
Like a bladder press external pressure is applied by pressurized air (rarely water) that gradually inflates the membrane that gently presses the grapes against the drain screen. The advantage of this style of press is the gentle pressure and minimal movement of the grapes, which minimizes the amount of tearing and scouring of the skins and seeds.
One of the first written accounts of a mechanical wine press was from the 2nd century BC Roman writer Marcus Cato. One of the earliest known Greek wine presses was discovered in Palekastro in Crete and dated to the Mycenaean period (1600–1100 BC). Like most of the earlier presses, it was mainly a stone basin for treading the grapes by feet ...
After the primary fermentation of red grapes, the free run wine is pumped off into tanks and the skins are pressed to extract the remaining juice and wine. The press wine is blended with the free run wine at the winemaker's discretion. The wine is then kept warm and the remaining sugars are converted into alcohol and carbon dioxide.
Pomace in a bladder press.These are Chardonnay grapes left over after pressing.. Pomace (/ ˈ p ʌ m ə s / PUM-əs), or marc (/ ˈ m ɑːr k /; from French marc), is the solid remains of grapes, olives, or other fruit after pressing for juice or oil.
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