Juice and Essential oil extraction from citrus fruits
50% of the extractors currently in use in the United States whilst in Brazil, Argentina and Israel, itís practically the only system being used. In-line machines are also distributed in Italy, Spain and other countries throughout the world. This transformation system requires a preliminary calibrating of the fruit in order to produce the best quality. But what makes this system unique is that itís the only one which operates without having to cut the fruit into two halves. The main reason why the juice collected from In-line extractors is of superior quality is that the juice never comes into contact with the peel and itís immediately moved away from the separation membranes and the pips.
In order to be able to treat different varieties of citrus fruit available in different parts of the world in the most efficient way, the In-line system allows for great flexibility in the adjustment of components to obtain the best extraction. This favours maximum yield while maintaining high quality.
What makes the SP40 stand out when compared with all the other systems currently on the market is its higher juice yield, which tops that of all others. This particularity is made possible by the positive feeding of the SP40 and by its capacity to extract different citrus calibres and shapes.
An example of an In-line installation with two lines of SP40 extractors
Thanks to the use of the prefinisher tube or strainer, the quality-performance ratio is better than that of any other extraction method. In fact, this strainer simultaneously eliminates seeds, central membranes and segment membranes. It is vital that these parts of the fruit are separated from the juice as soon as possible in order to prevent the juice from being impregnated by aromas, odours or unpleasant elements which affect the taste and which may be detrimental to quality. Besides, this strainer, available in different tube diameters, controls the level of pulp in the juice. Following the preliminary selection processes of washing, brushing and grading, the fruit is sent to the SP40 extractor lines. When the fruit comes out of the extractor, the fruit can be practically separated in three substances:
- Juice, when pressed, is of excellent quality and looks exactly like home-squeezed juice. The juice can be further refined using the FF50 Finisher.
- Oily emulsion which results from refining with the use of the FF50E Finisher is processed through the centrifuge machines in order to produce separate batches of essential oil and water, to be recycled after filtering and decanting
- Peels, cores and seeds, once ejected by the machine, these by-products can be used in the making of other products such as for example animal feed.
Juice and Essential oil extractor from citrus fruits SP40
Finished Juice Quality
The main reason why juice obtained using the SP40 juice extractors is of superior quality is due to the principle of immediate separation during the extraction of the whole fruit. When in the extractor, the juice is immediately separated from elements, which could influence end product quality if left in contact with the juice, even for a very short time.
The juice quality is further guaranteed by system maintenance, which is carried out, in optimal hygienic conditions. In fact, our Speciale machines are made entirely out of stainless steel with the exception of some mechanical parts.
The in-line juice extraction system has a juice yield, per individual fruit, which is higher than that of any other system. This excellent offer has been made possible thanks to the SP40 extractor’s pressing efficiency regardless of fruit size or shape. SP40 extractors can press citrus fruit of any size and variety, including Persian limes, lemons, mandarin oranges, oranges and grapefruits.
When adding extra parts such as different sizes of cups, cutters and strainers to the SP40 machines , it is possible to transform the great variety of citrus fruits available throughout the world in different ways. This versatility reduces to a minimum the number of extractors necessary and results in savings both in space and cost. Fruit transformation capacity with each SP40 extractor varies from 2.5 t/h to 3.2 t/h.
After extraction, the juice is collected and sent by force to the juice finisher to reduce pulp content. The FF50 citrus juice finisher consists of a worm screw of variable pitch and a sieve, which has very fine holes. The diameter of these holes can be smaller or larger in order to obtain juice, which contains differing quantities of fruit particles, depending on client demands. The juice to be refined is forced out by pressure through the sieve, which is supported by a strong frame composed of two halves. This process prevents the juice and its emulsion from coming into contact with the air. The excess pulp is discharged using automatic regulation of the extraction pressure by means of a compressed air driven piston.
Essential oil quality
When using our SP40 machines machines in the In-line extraction system, you can screen both juice and essential oil. This feature not only saves space and energy needed in the collection of oil but it also produces higher yields. Space is saved, as additional oil-extraction machines are not required. Water consumption and the necessity to discharge sewer water is minimised thanks to water recycling systems.
The high quality of the essential oil allows producers to commercialise their own product as cold-pressed oil.
Detail of pure essential oil
after the emulsion centrifugation
Refining the essential oil–water mixture
Before going through the extractors to screen water and essential oil, the essential oil-water mixture should be filtered as it comes out of the SP40 extractors by the FF50E emulsion finisher. The more sophisticated FF50E machine works like the FF50 Juice finisher, but with an extra-perforated sheet added to the first. This guarantees a much finer filtering compared with the FF50
Recovering other by-products
The quantity and quality of the juice pockets for pulp washing is superior in the SP40 because the bitter components as the fibrous parts, the membrane and the pips are instantly separated from the juice and juice pockets via the prefinisher sieve during the extraction cycle.
The SP40 extraction system offers a wide range of ways to collect pulp. The juice pocket dimensions can be adapted to producer and client needs. The extractor can be configured to obtain normal-sized juice pockets. This is particularly useful for concentrated juice and other products or also to obtain high quality pulp. The juice pockets obtained with this system and used particularly for “no-from-concentrated” juice vary between 7 and 10 millimeters and are practically devoid of skin, bits of pips and pips in their embryonic state. Almost 90% of these pockets conserve their floating character.
Skin, fibrous bodies, membranes
Skin, fibrous bodies and other products obtained during extraction can also be used. Today, these by-products are used for animal feed, but also for producing the pectins. The pectin is used as a setting agent or for enhancing taste in juice or for pharmaceutical use. The advantages of all these by-products, which derive from SP40 extractors, are their low initial and operating costs. For example, according to a study carried out by one of the worldís largest manufacturers for the production of citrus-based animal feed, by-products obtained by the In-line system requires lower capacity at mills, presses, driers and evaporators to obtain the same amount of product coming from other system types.
Fruit skin after extraction