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What is the difference between hydraulic oil press and screw oil press

News oil press470

Hydraulic oil press and spiral oil press are two common oil crop oil pressing equipment, which have significant differences in pressing principles, applicable oil materials, oil yield and efficiency, equipment advantages and disadvantages. The following is a detailed comparison of these two oil presses:

  • Principle of squeezing
  • Hydraulic oil press: using a high-pressure hydraulic system, hydraulic oil is pumped into the hydraulic cylinder through a high-pressure oil pump, generating enormous pressure and forcing the oil in the oil to be squeezed out. This pressing method is gentle, causes minimal damage to the oil, does not generate excessive heat, and is suitable for occasions that require high oil quality, such as cold pressing olive oil, walnut oil, etc.
  • Spiral oil press: Using an electric motor to drive the spiral spindle to rotate, the oil is squeezed and rubbed by the pushing force of the spiral. As the squeezing chamber space gradually shrinks, the oil in the oil is squeezed out. This method is highly efficient and suitable for continuous production and processing of large amounts of oil, but it may generate a certain amount of heat, which may affect the natural composition of the oil.
  • Applicable oil materials
  • Hydraulic oil press: More suitable for oilseeds with high oil content and high oil quality requirements, such as olives, peanuts, sesame, etc., especially suitable for cold pressing processes that require maintaining the original flavor and nutritional components of oilseeds.
  • Spiral oil press: suitable for processing oilseeds with relatively low oil content or high oil efficiency requirements, such as soybeans, rapeseed, cottonseeds, etc., suitable for large-scale commercial production.
  • Equipment advantages and disadvantages
  • Hydraulic oil press:
  • Advantages: The equipment pressure is static pressure, and the mechanical friction of the oil is minimal. The pressed oil is very clear and can be consumed directly without much processing, which is convenient and safe.
  • Disadvantages: The oil yield is relatively low, the single machine capacity is small, the oil needs to be crushed, steamed and fried, and wrapped in cakes before pressing, the equipment is numerous and occupies a large area, the workmanship is complicated, the production cost is high, the equipment investment is large, and the output is small.
  • Secondary utilization value of Youbing (Deep-fried round and flat dough-cake): the hydraulic oil press will not destroy the organic components in the oil during the pressing process, and Youbing (Deep-fried round and flat dough-cake) has high secondary value and wide use. The screw oil press will produce high temperature due to mechanical friction during the oil pressing process, and the water in the Youbing (Deep-fried round and flat dough-cake) will be lost, which will also cause some losses to the direct sales of Youbing (Deep-fried round and flat dough-cake).
  • Matching power: The matching power of small and medium-sized hydraulic oil presses is generally 1.5~3kw. In addition, hydraulic oil presses are easy to maintain and have cheap accessory prices; The spiral oil press relies on mechanical rotation to work, generating a large amount of friction during the oil pressing process. The wear between the spiral shaft and the pressing ring is quite fast. If the workload is large, it is usually replaced every six months, and the price of accessories is relatively high.
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