The process of cold pressing oil is the process of extruding oil from the pressing material with the help of external mechanical force. In the cold pressing process, physical changes mainly occur, such as material deformation, oil separation, etc. minioilmill The inner and outer surfaces of the squeezed particles are squeezed tightly against each other under the action of pressure. So that the liquid part and the gel part are respectively produced in two different processes. That is, the oil is squeezed out from the squeezed gap of biscuits.cold pressed sesame seed
1.The process of separating grease and gel part.
In the main stage of cold pressing, the oil under pressure can be approximately regarded as following the principle of mucus hydrodynamics. That is, the oil extraction can be regarded as the movement of the incompressible liquid in the deformed porous medium. The average speed of grease flow mainly depends on the friction and driving force inside the liquid layer in the pores.oil big oil mill
At the same time, the thickness of the liquid layer and the length of the oil path are also important factors affecting the oil discharge rate at this stage. In general, the lower the viscosity of the grease, the greater the pressure. And the faster the grease will flow out of the void. At the same time, the longer the oil flow path and the smaller the pores. The lower the flow rate and the slower the pressing. cold pressed groundnut oil machine
2.The forming process of cake.
Under the action of pressure, the squeezed particles are continuously squeezed together with the discharge of oil. And the directly contacted squeezed particles generate pressure with each other, causing the plastic deformation of the squeezed material. Especially the oil film rupture will be integrated with each other. The pressing material is no longer a loose mass but an incompletely bound gel porous state with numerous voids. solar oil mill
That is, apart from the continuous gel skeleton of the cake formed by part of the particles. There are still many voids between the particles or before they are combined into a particle group. In fact, due to factors such as uneven pressure distribution and inconsistent oil flow rate in the actual pressing process.The residual oil distribution in the cake after pressing will inevitably be inconsistent.oil press machine commercial
