The Journey of a Paddy: Inside the Milling Machine

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Introduction

How much do you know about milling rice, which is closely related to our daily lives? Maybe you know how paddy is harvested and threshed, but do you know how it transforms from golden paddy to shiny white milling rice and finally becomes our meal? This article will introduce you to the rice milling process. If you are interested, keep reading!

 

What is Rice Milling

Before introducing the rice milling process, I want to ask you, what does milling rice mean? Milling rice is defined as finely milled rice, with the bran and the germ layer removed. Therefore, rice milling is the process of removing impurities from white rice using a series of milling rice machines. First, stones and long straw mixed in during the paddy’s harvesting, threshing, and drying of the paddy are removed to prevent damage to the processing machines. Next, the paddy is hulled to turn it into brown rice. Then, the unwanted germ is removed from the brown rice, and the surface rice bran and other small impurities are blown off. Finally, the rice is polished, and you get fine white milling rice!

milling rice

History of Rice Milling: From Traditional Methods to Modern Technology

In ancient times, people produced milling rice by hand. As you know, people had very basic tools. They used stone slabs to rub and grind rice, using friction to separate the husks from the rice grains. As methods evolved, people started using stone mortars, pounding and pressing the rice to remove its bran. Later, they began using stone mills, placing rice in milling troughs, and using human or animal power to push the millstones, thus achieving the goal of removing the husks. All these methods relied on natural wind to separate the husks from the rice grains. In modern times, people have developed a range of rice milling equipment, creating production lines for processing rice in a streamlined manner, ultimately producing high-quality milling rice.

 

The Significance of Rice Milling

The milling rice process not only helps remove impurities from the rice, making the processed rice purer and enhancing its taste, but it also eliminates some impurities that can easily cause mold in rice, allowing your rice to be stored longer. Finally, the milling rice will have a finer texture, taste better, and be easier to digest. This is the purpose of milling rice.

 

What Steps Are Involved in the Modern Rice Milling Process

facts of rice milling machine

Rice milling equipment, processing rice from right to left

Step1. Pre-cleaning

Do you know? During the harvesting, threshing, and drying processes of rice, various impurities such as large stones, weeds, and partially cleaned straw inevitably mix in. Even small dust particles can be present. The first essential step is pre-cleaning these larger impurities. If they are not removed beforehand using a vibratory cleaning sieve and specific-gravity stoner, hard stones and long straws can damage subsequent processing equipment. Pre-cleaning is crucial before moving on to the next steps of processing.

Step2. Dehusking or dehulling

In the process of rice milling, this is a crucial step. Inside the machinery, unseen to the naked eye, rubber rollers in the hulling machine frictionally press rice grains regulated by flow, separating the husk from the rice. The husks are blown away by a fan, leaving the rice grains behind. At this stage, you’ll notice the rice is a light yellow color, it is not milling rice, known as brown rice.

Step3. Paddy separation

After passing through the hulling machine, some rice grains that were not successfully hulled were mixed with the hulled brown rice. At this point, you need a gravity paddy separator to handle this mixture. You can see that the sieve surface of the gravity paddy separator moves back and forth. Due to differences in friction coefficient and size, the rice grains and brown rice on the sieve surface are separated into unhulled rice grains and successfully hulled brown rice.

Step4. Bran removal

Next is the “whitening” step for the rice. In a rice abrasive whitener machine, the emery rollers will grind the husked brown rice, removing the outer layer known as bran, or bran layer. The material that is ground off is called rice bran, which is the light yellow part on the surface of brown rice. The process of bran removal also removes the germ part. At this point, you’ll notice the rice has a more attractive appearance, and its texture is also improved, this is the milling rice meaning.

Step5. Polishing

Polishing is done by the mist-polisher to enhance the appearance of rice. The polishing of rice can be divided into two steps. First, rice is lightly sprayed with water to reduce the adhesion between the germ and bran layers. Don’t worry, only a small amount of spray is used, which doesn’t significantly affect the rice’s moisture content. Second, the rice is polished under pressure and at a certain temperature using polishing rollers. This process makes the starch gelatinize and the rice grains smoother, covering any cracks that may have occurred during processing. This not only reduces broken rice but also makes the rice more round and visually appealing.

Step6. Grading

If you want to classify milling rice into different grades for selling at various prices, you can opt for a rice grader. This machine uses vibrating sieves with varying sizes of holes on each layer to separate milling rice into grades like whole grain, large broken, medium broken, and small broken

Step7. Color sorting

If you have higher quality requirements for milling rice, you may consider using a color sorter. As the name suggests, a color sorter removes discolored rice or impurities based on the optical differences in rice grains. This enhances the overall quality of milling rice. To improve efficiency, a color sorter is equipped with an extra elevator compared to other equipment. This elevator works by sorting discolored grains rejected during the first pass along with the rice undergoing initial color sorting.

Step8. Packaging

Most rice milling equipment lines come with packaging machines. These machines automatically weigh and package the milling rice according to the weight you set. This saves a lot of labor and makes the process more precise and very convenient.

 

Conclusion

From ancient times to modern days, through refinement over time, the process of rice milling has become increasingly sophisticated, resulting in higher-quality milling rice after processing. Anon, as an expert in agriculture within a major agricultural nation, has been dedicated to exporting agricultural machinery for over a decade. With extensive experience, Anon can provide equipment tailored to your needs, supporting your business endeavors every step of the way!

 

FAQ 

What types of rice mill machines are suitable for your needs?

When it comes to rice milling equipment lines, bigger isn’t always better. It’s important to make the best decision based on factors like your available production area, daily output, voltage requirements, and other considerations.

How do rice mill machines enhance efficiency?

Rice milling equipment can replace manual labor, achieve automation, significantly reduce labor costs for you, and save time and effort.

 

 

 

 

 

 

 

 

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