Selection and Maintenance of High-Efficiency Prepress Machines: Ensuring Stable Production for Export Customers

This article focuses on the selection and maintenance points of large-scale hydraulic/prepress machines, systematically analyzing the complete technical process of the vegetable oil pre-pressing stage. It includes key steps such as raw material cleaning, steaming, and pressing, which play a crucial role in the overall vegetable oil processing chain.

The Core Role of the Pre-pressing Process

The pre-pressing process is of great significance in vegetable oil processing. It accounts for approximately 30% - 40% of the overall oil extraction efficiency. By pre-treating the raw materials, it can effectively reduce the load on subsequent extraction processes. For example, in a large-scale vegetable oil processing plant, after implementing a scientific pre-pressing process, the oil extraction efficiency increased by 15% compared to the previous process without pre-pressing.

Technical Process Details

The technical process from raw material preparation, crushing, steaming, to pressing is complex but well - structured. In the steaming process, the steam volume needs to be precisely adjusted. Generally, for every 100 kilograms of raw materials, the steam volume should be controlled at about 15 - 20 cubic meters. The temperature gradient setting is also critical. The raw materials should be heated to 100 - 110 degrees Celsius during the steaming process to ensure the best physical and chemical changes. The control of cake thickness is another key factor. A consistent cake thickness of about 3 - 5 millimeters can significantly improve the subsequent solvent extraction efficiency.

Practical Application Scenarios and Solutions

Taking the cold pressing of soybeans as an example, the structure of the cake after pre - pressing has a direct impact on the subsequent solvent extraction efficiency. If the cake structure is too dense, the solvent penetration rate will be reduced, resulting in a decrease in oil extraction efficiency. Through practical operation and equipment debugging, by properly adjusting the pressure and speed of the pre - press machine, the porosity of the cake can be increased by about 20%, thus improving the solvent extraction efficiency by about 12%.

The Coordination between the Pre - Pressing Stage and Other Processes

The pre - pressing stage is closely linked with other processes in the vegetable oil production line. By optimizing the pre - pressing process, the overall production efficiency can be improved. For instance, when the pre - pressing stage is well - coordinated with the solvent extraction stage, the production capacity of the entire production line can be increased by about 10 - 15%. This requires technical personnel to have a global perspective and optimize the entire production line from equipment operation to process flow.

If you want to explore more optimization solutions for the pre - pressing process, the rich resources in our technical white paper section will be your best guide. Click here to access our technical white paper section and unlock the secrets of efficient vegetable oil pre - pressing!