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May 13, 2022

How to sort dehydrated onion

In this blog we will walk you through the farm to table journey of dehydrated onion, types & varieties of dehydrated onion, its usage & application along with information about where & why our FDA complied sifters play vital role in its manufacturing process.

Dehydrated onions are the dried and dehydrated powder & granule version of onion that could be preserved from 1 to 8 years (depends upon packaging) and used as & when required.

Dehydrated onion flakes & powder have wide range of uses. It is used as seasoning in variety of dishes, used as prime ingredient in making commercial food products such as sauces, snacks & drinks, used as substitute to fresh onion in cooking as it is easy to handle & eradicates need of chopping fresh onions, used as ingredient to make various mixed spices, & more other usages.

Dehydrated onion is used as substitute of fresh onion not only as it reduces the efforts of chopping fresh onion, but it also has immense health benefits. Dehydrated onions are low in fat & calories, rich potassium & calcium.

Dehydrated onions are available in different sizes in market, from flakes to chopped, to minced, to granules, to powder form. The initial process of every type of dehydrated onion remains similar.

Let us now know the manufacturing process of dehydrated onions along with where & why our sifters & sorters play crucial role in their manufacturing process.

From farm to manufacturing unit

The process of making dehydrated onion starts from the growing & cultivating onions. Farmers grow & supply fresh onions to manufacturing units.

Peeling & washing

Once the onion’s received are stored & unloaded as & when require. The unloaded onions are then peeled off to remove unwanted outer portion. Peeled onions are sent to water tunnel where they are washed in 90-100 PPM Sodium Hypochlorite solution to remove dirt.

Slicing & Drying

Once the onions are properly washed, they are sent to slicing machine for slicing & chopping the onions. Sliced onions are then fed in imperial dryer for dehydrating & drying. Total five stages of automatic drying process take place to make sure taste & aroma of onion stays intact.


Dried & dehydrated kibbles are then passed on vibro sieving machines to remove skin, husk & uneven sized dehydrated onion.

Our robust linear & rectangular machine Linea XUANYU® could be the capitalizing option for sieving dehydrated onion.

Color sorting

Further to remove impurities like unwanted black particles, the dehydrated onions are passed though optical color sorter machine.

Metal Detection

The product is then passed through magnetic rods or magnetic separator belts to remove the ferrous metal impurities that could have been entered during above process.

XUANYU Machinery has wide range magnetic solution from magnetic rods to magnetic belt that could be the best option for removing ferrous impurities.

Sizing & Milling

As per the buyer persona & market demand, dehydrated onions are milled & grinded into chopped, minced, granules & powder form.

Grading, sieving & safety screening

Once the dehydrated onion is milled in desired size, the next process is of grading, de-dusting, sieving & safety screening for products derived from dehydrated onion. In total 5 different sized products are derived from dehydrated onion.

Safety screening, de-dusting, gradation & sieving is mandatory process in order

1. To obtain quality contamination free product (removing unwanted foreign particles)

2. To obtain uniformity in size (passing it through different sized mesh opening screens)

Our wide range of round vibro screens & centrifugal sifters like XUANYU Vibro Separator®, XUANYU Tumbler Screen®, Inline XUANYU®, XUANYU Roto Sifter® has proven record in screening, sieving & grading dehydrated onion.


The sieved & screened product are then weighed, packed & sealed in moisture resistance or moisture proof poly bags. These poly bags are now packed in corrugated boxes or paper bags & are ready for dispatch.

Why our sifters, separators & vibro screens?

XUANYU Machinery’s machines have been serving food industry since the day of establishment. We have mastered the art of manufacturing vibro gyratory screens, rotary & rectangular sifters, automatic filters that are exclusively designed for food industry.

- Our machines are as per compliance of FDA & c-GMP.

- Our machines are available in high quality corrosion free material i.e. Stainless Steel

- Our machines have crevice free joints & welding that enables zero product contamination.

- Our machines come with food grade internal parts like food grade rubber gasket.

- Our machines require minimal maintenance & have long life span.

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