To ensure the quality of orange juice, staffs need to choose those oranges without bitter tastes, and remove those damaged or unqualified fruits. The staffs sort the oranges with a roller type fruit sorting machine. The oranges are preserved in a warehouse.
Usually, they add 1-2% sodium hydroxide and disinfectant to the water tank.
The cleaned oranges are conveyed to the needle unoil machine. It pierce the orange peels. When the oil escape from the orange peels, it is washed away by the spray water.
A disc centrifugal separator can separate the orange oil from the water. The residue liquid will return back to the unoil machine through a circulating pipe and serves as spray water.
The juice extractor for kernel fruits, stone fruits, and berries are not suitable for unoiled fruits. Generally, oranges are extracted by in-line juicer, brown type juicer, Anderson juicer. The juicer should prevent pericarp oil, white cortex, and cysts from getting into the orange juice, and prevent the seed broken.
The original orange juice extracted by the juicer still contains orange pulp. A fruit pulper machine can filter out the large particles in orange juice.
Original orange juice is easy to oxidize, thus causing the loss of color, tastes, and vitamin C. Degassing can preserve the quality of orange juice. Fruit juice degassers have centrifugal spray, pressurized spray, and film flow 3 types.
To preserve the microbial stability of orange juice, they usually adopt 71-72℃ sterilization and corresponding time.
To inactivate the pectin methylesterase and preserve the colloidal stability of the original orange juice, they need to adopt 86-99℃ sterilization.
Orange juice usually adopt freeze concentration method. The concentration stops when the soluble solid takes up 65%.
After the orange juice concentrate at -5～-8℃, it is filled into a barrel coated polyethylene inside. The sealed barrel will placed in a refrigerated storage at the temperature of -25～-30℃.
The above displayed how to make concentrate orange juice in factory. But to make drinkable orange juice sold in the market, they need to add water to the concentrated juice, as well as some additives like sugar, syrup, essence, thickener, preservatives, etc.
Many orange juice manufacturers buy concentrated orange juice from factories and make orange taste drinks with it. Orange juice concentration can reduce the volume, save transportation cost, and inhibit microbial activity.
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