Following factors may affect oil output rate :
1. Water content: This is the critical factor, as a matter of fact, water content directly affects oil output rate. However, user usually has not proper inspection equipment. Hence, water content of some main raw material may be detected as follows:
1.1 Bean: If teeth beating could crack it, forming flat pieces accompanied with light sound, the water content is suitable. Flat piece without cracking means too wet. Heating or sunshine may be drive water off. However, cracking accompanied with loud indicates too dry, adequate water needs to be added.
1.2 Cotton seeds: Shell and kernel may be separated by teeth beating. Shell breaking may be accompanied by sound, which means water content is suitable. Shell being flatting indicates too wet, shell being splitted into powder means too dry.
1.3 Rape seeds: They can be pressed either at hot or at cold state. Cold pressing: extruding by finger, if they splitted into two pieces. accompanied by sound and oil, this implicates water content is adequate. Otherwise, extruding makes, power indicates too dry, makes flat slice, too wet. Hot pressing (after heating); To scratch seeds by two slices of wood, if shell and kernel could be splitted, water content is adequate. If kernel becomes power, it is too dry; in the case that shell and can be splitted, it is too wet.
2. Cakes thickness reflects the pressure inside the chamber. Thicker cake indicates lower pressure inside the chamber; thinner cake-higher pressure inside. If raw material has less oil content, chamber pressure should be higher, cake will be thinner, round plates need to be tightened; in the case of high oil content material, pressure in the chamber should be lower, then circular plates need to be loosened, resulting in thicker cake. Recommended thickness of cakes will be.
Bean: 1.1 – 1. 5mm for the first time ; 0. 5 – 1mm for the second time.
Cotton seeds: only one pressing, 1 – 2mm.
Ground nut kernel: Normally cold pressing for 2-3 times, 1-2mm
Important note: cakes thickness should be as according to different factors to achieve highest oil output rate. Hence, above figures will only be for reference.