1 pressing water and pressing temperature
Countless facts have proved, although the machine behavior control is good, but because of pressing water and pressing temperature control is not good or unstable,equally difficult to produce normal effect. Pressing water and temperature affected thestock of physical properties and chemical process.
The results of the theoretical research shows: blank should have the appropriate moisture and temperature, namely blank fluidity, oil viscosity and surface tension tominimize, ensure material embryo plastic and elastic appropriate, to keep pressing chamber pressure is normal. The actual test also indicated that: blank pressing water content can not be less than the limit of the suitable range into cakes, while pressingtemperature 110 ～ 130 ℃.
If the water is too high, will make the material embryo produces clumps of oil andwater; too low, material were pressed into powder, easy to coke instead of blockingbore. Similarly, if the temperature is too high, the material in the embryo carbohydratecoking, protein and other ingredients are destroyed, color darker, affect the oil quality;on the contrary, when the temperature is too low, the physical changes of normal andbiochemical condition cannot form.
Pressing water and temperature, usually by the pretreatment process to achieve.
Practice has proved that, in general, the "hot press method" in the oil extraction efficiency and economic benefit are significantly better than that of cold pressing. The"cold pressing method", will cause the pressing times increasing, daily processing capacity of greatly reduced, residual oil rate increased, consumption increased power,economic decline. It should be pointed out that, by using the cold pressing, because the oil with high moisture content, press the cake is not easy to be broken; secondpress, easily overhead in the hopper, effects of feeding and often stirring,troublesome operation, poor efficiency. Therefore, where possible, should try to use"hot press method".
2, the press bore pressure
The essence of pressing oil, is putting pressure on the stock removal of grease. Main reasons affecting the pressing chamber pressure is the cake thickness, feed quantity and quality of pretreatment (pressing the moisture and temperature etc.). The cakethickness and the oil efficiency relationship. The cake is thicker, the press borepressure is small, load is small, low oil yield; on the contrary, the cake is thin, high oil yield efficiency. But the thin, it will increase the machine load, causing the accident.The feed quantity should be controlled in a moderate flow, in order to avoid the "bypass' 'phenomenon, pressing chamber pressure to maintain the normal stable.
3, the time of pressing
Press time and the efficiency of oil has certain correlation. Generally, press time, oil flows out of a man, but the press time not too long, otherwise more heat loss, but the impact of the oil production efficiency and capacity. Therefore, in the premise ofefficiency of oil, as far as possible to shorten the time of pressing. The residence time of material embryo in the press bore, mainly depend on the screw shaft speed,followed by screw pressing ring recency and cake thickness. For some high oil content oilseed, can prolong the time of pressing, should choose the appropriatespeed.
SYL series spiral oil press belonging to the "high speed Griddle Cake", the so-called"high speed", refers to the spindle speed, feed the embryo in the press bore short residence time (generally only tens of seconds); the so-called "Griddle Cake" is that the cake thickness 1.5 ~ 3 mm, therefore, screw and the pressing ring wear phasequickly when. According to experience, usually 40 ~ 50 tons of rapeseed processingneed to check, partial replacement of wearing parts (especially the 3 - 4 screw and the adjustable cake). Since the 6YL series spiral oil press press time is short, for some oil (such as soybean protein and cold pressing, etc.) is good, but other oilfurther reduce residual oil rate is subject to certain restrictions, for different fuel, there should be a corresponding spindle speed.
4, pressing chamber temperature
The process of squeezing, squeezing chamber temperature directly affects theefficiency of oil, oil quality. The squeezing chamber temperature internal frictioncaused by external Fu heating mature embryo and pressing ring and the screw shaftsurface friction heat, stock turnover and heat generation, compensation metal bodyheat loss, to maintain the proper temperature required by the press. Howeverpressing chamber temperature is too high, will lead to oil and cake color even coke,total oils loss increased. Therefore, must establish the press bore heat balance between normal.