Manual book of oil press
7
6.
Squeezing methods of some main oils (for information only) :
(Ⅰ)
Requirements of pretreatment procedure before squeezing the oil material
1.
Drying and choosing for oil material.
The oil material shall be dried in the sun and winnowed to be clean, making
the moisture less than 10%, impurity not more than 0.5%. In particular, many users
neglect the choiceness, an indispensable pretreatment procedure, considering it is
nonessential. However, as for the oil material that is not chosen, the dust will block
the oil way, and the sand will quicken the abrasion of parts, not only having
influence on the normal work, but also shortening the useful life of squeezing bolt,
squeezing bolt and cake outlet.
2. Husking and peeling.
Peeling such oil material with shell as cottonseed and peanut will improve the
handling capacity and oil yielding rate of oil press.
3. Crushing and flaking
This machine may press oil without this procedure, especially the rapeseed, which
will be not produce obvious effect without flaking. However, as for other materials,
the flaking will be good for improving handling capacity and oil yielding rate.
4. Cooking
While the machine is applicable to cold press, the production rate and oil yielding rate
of hot press will rank above that of cold press. When the material is being cooked, the
fire power shall be appropriate and the stirring shall be even so as to prevent from
being burnt or being burnt outside while being uncooked inside.
(Ⅱ)
Squeezing methods of some main oilseeds
1. Sesame
Before squeezing, the seed shall be cooked to be light gray with crack and oil will
come out if pinched. While the seed is being cooked, intense fire shall be adopted, and
the temperature shall be 120-150
℃
, and the cake thickness shall be 0.7-1.5mm. If it is
appropriately cooked, the oil will smoothly flow out without any residual and the cake
may be with strip shape. And the oil will be pressed out only for one time.
2. Rapeseed
For the moisture in the material of south and north is different, about 4-6% water
shall be added in north and no water added in south (depend on the inherent moisture)
before cooking. Intense fire shall be adopted to cook the seeds until they are hot
enough to burn the hands and cracks come forth, then small fire is used to cook them
to be brownish red. It is not allowed to add water during the cooking. The temperature
of the seeds that is too pressed shall be 100-120
℃
, and the moisture, about 1-15%.
Whether it is appropriately cooked or not, it can be determined by the oil flowing and
cake output. If it is appropriate, the oil flowing and cake output is smooth and there is
no residual in oil basically. In addition, the cake thickness is 1-1.5mm with flack
shape of brownish red