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The second process is the hydraulic press; this exposes the shredded produce to extreme pressures between two plates. [7] The pressure causes the juice and water content from the produce to drip into a collection tray below, leaving behind the fibre content in the filter bag.
The hydraulic press depends on Pascal's principle.The pressure throughout a closed system is constant. One part of the system is a piston acting as a pump, with a modest mechanical force acting on a small cross-sectional area; the other part is a piston with a larger area which generates a correspondingly large mechanical force.
After the apples have been ground into pomace, the pomace must be squeezed to extract the juice. This is done in a device called a cider press, which like the cider mill, takes various forms. [13] One form is a large horse-operated lever press or screw press. This method was common in Britain, Jersey, and northern France, as well as the United ...
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 through 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 10000 years. [3]
Juice is extracted by pressing or grinding a halved citrus along a juicer's ridged conical center and discarding the rind. Some reamers are stationary and require a user to press and turn the fruit, while others are electrical, automatically turning the ridged center when fruit is pressed upon.
[8] (p95) There are various types of pressing equipment that can be used for this process (screw, hydraulic, belt, and pneumatic). [8] (p96) Pressed juice and free run juice are held in slurry tanks. The press aid is added to the juice, serving as a filter when the juice undergoes rotary vacuum belt filtration to remove insoluble solids.