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What is the difference between the pressing methods of different raw materials in the oil press

September 23, 2021

 oil press

1. Soybean oil soybean squeezing method: The traditional soybean pretreatment and extraction process is relatively simple. Advanced soybean pretreatment and leaching technology can use dehulling, extrusion, wet heat treatment and other technologies, which can be combined with soybean drying before dehulling. Hardening and tempering, skip the softening process and simplify the pretreatment process.

2. Sesame oil squeezing method: In my country, sesame oil is produced by water displacement method, squeezing method and pre-squeezing extraction method. The water exchange method is the main method. The sesame oil extracted by the water-substitution method is called small mill oil, which has good quality and unique fragrance. However, my country's water method has small production scale, scattered processing, backward technology, outdated equipment, low labor productivity, high residual oil (generally 9-12% on a dry basis), and water content (the water residual content can reach about 65%). Deterioration, peculiar smell, extremely low utilization rate. Due to the high temperature of cooking, some ingredients will become bitter under the action of high temperature, which will affect the quality of flour.

3. Fully automatic oil pressing cottonseed pressing method: cottonseed contains gossypol, and the pretreatment process requires high-humidity steam to reduce the content of gossypol in crude oil. Refined cottonseed oil is completely safe to eat. Improve the quality of wool cotton oil. However, gossypol in cottonseed meal, crude oil and meal prepared by traditional oil production methods contains gossypol, which affects the nutritional value of meal. Cakes must be detoxified before they can be used as food. However, there is no ideal detoxification process.

4. Rapeseed rapeseed pressing method: In recent years, the development of rapeseed oil production technology, especially double-low rapeseed oil production, including rapeseed dehulling oil production, cold pressing oil production, extrusion oil production, etc. Its products include green rapeseed oil, rapeseed meal for animal feed, etc.