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Final operations of pistachio processing

Washing and cleaning:

 

Pistachios should be washed and cleaned immediately after peeling, so that their bony skin is cleaned from the remains of the skin and plant juices. Otherwise, these materials will quickly change color and reduce the quality of the product and cause stains on the bone skin. Iranian Pistachio

 

Machines made for cleaning and preparing pistachios are installed after the peeling wheel and the transfer of pistachios along the line is done with the help of conveyor belts. Installing a garbage collection device in order to separate the skins that are removed from the wheel with the product and other light materials before the floating tank (water pool), prevents the entry of extra load into the tank and increases the efficiency of the tank.

 

Floating tanks (water pool)

 

Floating peeled pistachios in floating tanks causes the light seeds to float on the surface of the water and their easy separation from the final product, and it should be placed after the garbage collector. In the peeled product, in addition to healthy and peeled pistachios, there are a large number of peeled, unripe, dried, damaged and unpeeled seeds, which have a high possibility of being contaminated with fungi and aflatoxin and should be separated. did Separating these seeds as much as possible at this stage plays a major role in the amount of aflatoxin in the final product and reduces the amount of aflatoxin in the final product.

 

Gogir

 

Among the different types of pistachios, roller pistachios are the most effective for separating pistachios that have not been peeled for any reason (immaturity, dryness, etc.), while they do not cause mechanical damage to the product. The use of these devices after dehumidification has a higher efficiency. Separation of unpeeled pistachios before dehumidification is effective in the operation of the dehumidifier and prevents pistachios suspected to be contaminated with aflatoxin from coming into contact with healthy pistachios. Therefore, it is better to use dehumidifiers both before and after dehumidification.

 

moisture catcher

 

In semi-mechanized systems, some of the pistachio moisture is taken by dehumidifiers. The percentage of moisture reduction of pistachios depends on the length of moisture absorption and the speed of transfer of pistachios. In cases where the volume of work allows, the duration of water absorption can be increased by closing the outlet of the dehumidifier in order to reduce more of its humidity. Dehumidifiers increase the efficiency of dryers and better use of heat energy by evaporating surface water from pistachio washing. It should be noted that the repellent alone is not able to provide the necessary protection in terms of fungal growth, and drying with hot air to reach a humidity of 4 to 6% is necessary before doing any other work.