What is the reason why the screw oil press cake is not formed?

Screw oil press is one of the common equipment in edible oil processing industry, which can press peanuts, soybeans, rapeseed and other oils, so it is widely used. However, many edible oil manufacturers will encounter the problem of cake not forming when using the screw oil press. Today, we will introduce the reasons and solutions for the cake not forming of the screw oil press.

1. Raw Material Related

Moisture Content of Oilseeds

The moisture content of the raw oilseeds is crucial. If the oilseeds are too dry, the cells within them lack the necessary plasticity. During the pressing process, the dry oilseeds are unable to adhere to each other under the pressure of the screw shaft. For example, when pressing peanuts, if the moisture content is lower than 8 - 10%, the particles tend to crumble rather than bind together to form a cake. On the contrary, if the oilseeds are too wet, the excess moisture acts as a lubricant. The high moisture content reduces the friction between the oilseed particles and the inner wall of the oil press barrel, and also between the particles themselves. As a result, the pressure exerted by the screw shaft cannot effectively compress the oilseeds into a solid cake. This is one of the reasons for the cake not forming of the screw oil press.

Quality and Variety of Oilseeds

The quality and variety of oilseeds also play a role. If the raw materials contain a lot of impurities, it will also have a negative impact on the working efficiency of the oil press. Immature or damaged oilseeds may not have the proper structural integrity.

2. Equipment Related

Wear of the screw

The screw is a key component of the screw oil press. Over time, due to continuous friction with the oilseeds, the screw shaft may experience wear. If the threads of the screw are significantly worn, the conveyance and compression of the oilseeds will be affected. The worn - out screw shaft cannot generate a uniform and sufficient pressure along its length. As a result, the oilseeds are not compacted evenly, and the cake of the screw oil press is not formed. The wear of the screw shaft is more likely to occur in oil presses that have been used for a long time without proper maintenance.

Correct maintenance method

Learning to maintain and properly operate screw oil press will also help solve the failure of the screw oil press cake to form. Once you have finished pressing oil, clean the oil press again. Remove any remaining residue from the hopper, screw shaft, and other parts of the machine. This helps to prevent the growth of mold and bacteria and also ensures the smooth operation of the oil press for future use. Lubricate the moving parts of the oil press regularly. This reduces friction and extends the lifespan of the equipment. Store the oil press in a dry, clean place away from direct sunlight and moisture. Moisture can cause rusting of the metal parts, which can seriously damage the oil press.

 Screw oil press machine

3. Operation Related

Unstable Feeding Rate

A stable feeding rate is necessary for the proper operation of the screw oil press. If the feeding rate is too fast, the oil press may not be able to process the large amount of oilseeds in time. The oilseeds will pile up in the hopper and the initial part of the barrel, and the pressure will be unevenly distributed. As a result, the cake of the screw oil press is not formed properly. Conversely, if the feeding rate is too slow, the screw shaft may run with insufficient material, which also disrupts the normal pressure build - up and cake formation process.

The above are the reasons and solutions why the screw oil press cake is not formed. In conclusion, the failure of the screw oil press cake to form can be attributed to a combination of factors related to raw materials, equipment, and operation. By carefully checking and addressing these aspects, operators can improve the performance of the screw oil press and ensure the successful formation of cakes during the oil extraction process.