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White Rice Processing

Views: 178     Author: Site Editor     Publish Time: 2023-09-11      Origin: Site

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RICE MILL PLANT


White rice processing, also known as rice milling, is the series of steps involved in removing the outer layers (husk, bran, and germ) from raw rice grains to produce polished or white rice. The process aims to produce rice with a clean, white appearance and improved storage qualities. Here is an overview of the steps involved in white rice processing:


  1. Cleaning: The first step is to remove impurities, such as stones, sticks, and other foreign materials, from the raw rice. This is typically done using a combination of screens, magnets, and air classifiers.

  2. Hulling: The outermost layer of the rice grain, called the husk or hull, is mechanically removed in this step. Hulling machines are used to separate the husk from the inner rice kernel.

  3. Paddy Separation: After hulling, the mixture of rice kernels and remaining husk is passed through machines that separate the rice kernels (known as paddy) from the remaining husk and other byproducts.

  4. Whitening: The rice kernels still have an outer bran layer attached, which gives them a brownish appearance. In the whitening process, abrasive surfaces or rollers are used to remove the bran layer, making the rice appear whiter. This step can be repeated to achieve the desired level of whiteness.

  5. Polishing: To further improve the appearance and texture of the rice, it may undergo a polishing step. Polishing is done using friction to remove the outer layer of the rice kernel, creating a shiny and smooth surface.

  6. Grading and Sorting: After the polishing process, the rice is sorted and graded based on size, shape, and quality. This ensures that only high-quality grains make it to the final product.

  7. Packaging: The processed white rice is then packaged for distribution and sale. It is usually packed in various sizes, from small consumer packages to bulk sacks for commercial use.

  8. Quality Control: Quality control measures are implemented throughout the processing to ensure that the final product meets the desired quality standards. This includes checks for broken or damaged grains, as well as foreign material.


It's important to note that the degree of milling and polishing can vary based on regional preferences and market demands. Some consumers prefer parboiled rice, which is partially boiled before milling to retain more nutrients. This process results in a different texture and flavor compared to regular white rice.


White rice processing is a critical step in making rice suitable for consumption and extends the shelf life of the product. The discarded bran layers and husks can be used for various purposes, such as animal feed or for producing bran oil. The processed white rice is a staple food in many parts of the world and serves as the basis for numerous dishes and cuisines.


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