For consumers, this might just be a daily routine at the dining table; But for us foreign trade practitioners and factory technicians, from a paddy grain with a earthy smell to the crystal-clear commercial grain in the packaging bag, the journey in between is a “bitter journey” about physical separation and precise craftsmanship.
To help overseas customers better understand the process of Rice Milling, I have compiled this article. This is not only popular science, but also our industry’s respect for the quality of every grain of food.
From Field to Workshop: A Full-Process Analysis of paddy Processing
Pretreatment: Don’t let impurities ruin the machine
When paddy is transported from farmland to factories, it is often mixed with rice stalks, stones and even metal fragments. As an export standard product, ** Cleaning ** is the first step. We usually use vibrating screens and stone removers. Experience tells us that if the first step of removing the stone is not thorough, it will not only affect the taste of the finished rice (no one wants to break their teeth while eating), but also cause irreversible damage to the subsequent expensive rubber roller dehusking machine.
Husking: Gently “shelling”
The cleaned Paddy will enter the Husker. The goal of this step is very clear: to remove the outer hard siliceous shell without damaging the rice grains. The product after dehulling is called “Brown Rice”. At this stage, the Paddy Separator is of vital importance. Since the husking rate of rice cannot reach 100%, we need to take advantage of the differences in specific gravity and friction coefficient between paddy and brown rice to send the unhusked grains back to the machine for reprocessing.
Rice milling: The magnificent transformation from brown rice to white rice
Many people think brown Rice is healthy, but from the perspective of the mainstream demand of global trade, White Rice remains the core. ** Rice Milling (milling /Whitening) ** is the process of removing the bran layer on the surface of brown rice by mechanical friction or cutting.
Veteran notes: Rice milling is the stage with the highest Broken Rice Rate in the entire process. We need to precisely control the pressure inside the rice milling chamber. The pressure is too low, resulting in uneven peeling. If the pressure is too great, the grains of rice will break, directly reducing the commercial value of the product.
Polishing and grading: For appearance and also for shelf life
In today’s international market, especially among high-end customers in the Middle East and Southeast Asia, there is a high demand for the Translucency of rice.
Polishing: It is not about adding any chemical substances, but rather about thoroughly removing the residual bran powder on the surface of the rice grains through a small amount of water mist and friction. This not only makes the rice look like pearls but also extends its shelf life, as the bran powder contains oil, which can easily cause the rice to oxidize and deteriorate.
Grading: After polishing, we will use a drum grading machine to completely separate the broken rice from the whole rice. In export contracts, it is usually marked as “5% Broken” or “10% Broken”, and it all depends on this step for precise control.
Color Selection: Modern processing’s “sharp eyes”
This is my favorite part. A Color Sorter uses a high-frequency camera to capture particles of different colors. Whether it is yellowish diseased rice, greenish unripe grains, or transparent glass fragments, they will all be precisely “bounced” out by compressed air during the high-speed fall. Rice that has not undergone color sorting is difficult to be exported abroad under modern food safety standards.
Packaging: The Last Guardian
Finally, according to the customer’s requirements (usually 5kg, 10kg, 25kg or 50kg PP /PE bags), automatic weighing and vacuum packaging are carried out. For foreign trade orders, we will pay special attention to moisture-proof treatment. After all, rice has to endure weeks of high temperature and humidity in the containers during transoceanic transportation.
Conclusion
From paddy to rice, essentially it is a process of continuous “subtraction” : removing impurities, removing the outer shell, and removing the outer layer. As industry practitioners, our core task is to do subtraction while maximizing the retention of the whole rice rate and ensuring the purity of each grain of rice.
If you are looking for reliable processing equipment or high-standard export rice sources, understanding this logic is the prerequisite for communication. The debugging of each piece of equipment and the parameter setting of every link are ultimately reflected in that steaming bowl of rice.
Want to know more about the selection of rice processing equipment or export standards? Welcome to leave a message in the comment section below or contact our technical team directly for in-depth communication.
