What is the difference between a hot press oil press and a cold press oil press

27/06/2024News 6760

Screw oil presses extract oil from oilseeds through mechanical compression. Hot pressing and cold pressing are the two primary processes, differing mainly in processing temperature, workflow, oil yield, oil quality, suitable raw materials, and energy consumption costs.

Processing Temperature
Hot-pressing machine: Oilseeds undergo high-temperature steaming and roasting (typically 100-130°C) to break down cellular structures, denature proteins, and enhance oil fluidity.
Cold-pressing machine: Oilseeds are directly pressed at low temperatures (ambient to below 60°C) to prevent high-heat degradation of nutrients.
Hot-pressing Process:
Raw material cleaning → Crushing → Steam roasting (softening, conditioning) → Pressing → Crude oil filtration → Refining (deacidification, decolorization, deodorization).
Characteristics: Requires additional steaming and roasting equipment; complex process, but yields high oil extraction rates.
Cold-Pressing Process:
Raw material cleaning → Crushing → Direct pressing → Crude oil filtration → Low-temperature refining (or physical filtration only).
Characteristics: Simplified process, but requires higher-pressure equipment to ensure oil quality.

What are the advantages of a hot press oil press

High oil output rate.
Advanced technology. The new hot press adopts three-stage pressing, which can be squeezed clean in one go; The old-fashioned cold press requires 2-4 passes to squeeze it clean.
Better oil quality. The new hot press can evaporate water from oil products at high temperatures. In addition, after being subjected to high temperatures, the new hot press can evaporate harmful substances such as sulfite.
Save manpower. The new hot press machine can be operated by 1-2 people for production.
High yield and large production volume.
Energy saving and energy-saving

What is the application scope of an oil press

Hot-pressed oils: Dark in color with a rich aroma (e.g., sesame oil, peanut oil), suitable for high-temperature cooking.

Cold-pressed oils: Preserve natural flavors and are light in color (e.g., olive oil, flaxseed oil), rich in antioxidants like vitamin E and polyphenols, with no chemical residues.

Oil presses, with their high efficiency and versatility, can process a wide range of oilseeds and oil-bearing crops, serving applications across agriculture, food processing, and industrial sectors.

Soybeans: Oil yield approximately 12%-18%. After pressing, the soybean meal can be used as feed or a protein source.
Rapeseed (Canola): Oil yield 30%-45%, serving as the primary source of rapeseed oil.
Peanuts: Oil yield 40%-50%. Peanut oil possesses a rich aroma and high market value.
Sunflower seeds: Oil yield 25%-40%. Sunflower oil is rich in unsaturated fatty acids.
Sesame seeds: Oil yield 45%-55%. Sesame oil (sesame seed oil) has a distinctive flavor and is suitable for cold pressing.
Flaxseed: Oil yield 30%-40%. Flaxseed oil is rich in alpha-linolenic acid, making it a healthy cooking oil.
Perilla Seed (Shiso Seed): Oil yield 35%-45%. Perilla seed oil possesses medicinal value.
Walnut kernels: Oil yield 60%-70%. Walnut oil is rich in nutrients and suitable for infants and young children.
Almonds: Oil yield 40%-50%. Almond oil can be used in food or cosmetics.
Coconut meat: Oil yield 60%-70%. Coconut oil is heat-resistant and suitable for cooking or industrial applications.

Our diversified products

1.An oil press refers to a machine that uses external mechanical forces to increase temperature, activate oil molecules, and squeeze oil out of the oil material.
2.The frying machine is used for frying dozens of fried foods such as chestnuts, peanuts, melon seeds, walnuts, etc. It is versatile and has the advantages of being green, environmentally friendly, energy-saving, convenient, time-saving, and has a high production rate. It is the most ideal and advanced frying equipment.

3.Grain dryer refers to a hot air drying oven that uses a rotary heating device to generate a large amount of hot air in a short period of time. It can kill insect eggs through high-temperature treatment, completely solving the problem of grain drying.

Zhengzhou Fude Machinery produces oil presses, refiners, dryers, and shellers. If you want to learn about the agricultural product processing industry, please consult us.