It can be seen from the processing process of parboiled rice that the production process of a full set of the parboiled rice mill plant is based on the processing technology of white rice, adding hydrothermal treatment processes such as soaking, steaming and boiling, drying, and cooling, and slow stewing. The whole process of parboiled rice generally includes cleaning, soaking, steaming, and boiling section, drying and cooling section, cleaning, shelling, paddy separating, rice milling, rice polishing, white rice grading, rice color sorting, rice packaging, and other processes. It is because of the water heat treatment process that parboiled rice is more nutritious than ordinary white rice.
The selection principle of parboiled rice mill plant output mainly depends on the output and power of the subsequent rice milling machine. There must be a sufficient amount of parboiled rice before the rice hulling process can run. The output of the pre-parboiled equipment must be greater than the output of the subsequent rice mill. If that's not enough, two units can be connected in parallel. When the output is consistent, use a rice pre-parboiler with less power.
First of all, the rice should be cleaned first to remove the straw, stones, hemp rope, and other large debris and impurities such as dust mixed into the rice. After the cleaning process, failure of downstream processing equipment or damage to components can be effectively avoided, which is a key process of a complete set of rice parboiling equipment.
Through vacuuming, constant temperature, and pressure soaking, the water is fully absorbed by the rice in a short time, so that the water content of the rice reaches more than 30%, which is a necessary condition for the rice starch to be fully gelatinized during the cooking process. In the parboiled rice production line, this processing section is the basic and important section.
Depending on the variety and quality of rice, the soaking temperature is usually 55-70 degrees, and the soaking time is 3.5-4.5 hours.
Steaming and Boiling
In this process, high-pressure and high-temperature steam is used. The temperature, time, and uniformity of steaming must be strictly controlled so that the starch in the rice can be fully gelatinized without excessive.
When starch gelatinization is sufficient, the color of the processed finished parboiled rice is transparent honey-colored.
By adjusting the cooking parameters, parboiled rice with light color, sub-dark color, and dark color can be processed according to customer requirements.
Using the heat of the boiler, it is converted into the air through the heat exchanger, and the rice is indirectly dried, and the dried rice has no pollution and no peculiar smell.
The purpose is to reduce the moisture content of rice to 14% or less (safe moisture content) for easy storage and processing so that the maximum whole rice rate can be obtained when rice is milled.
The drying process is divided into two stages. The first stage is fast drying, which reduces the moisture content of the paddy from more than 30% to about 20%, and then slow-drying to make the paddy fully slow down and reduce the waist burst rate. Improve the whole meter rate.
The dried paddy is sent to vertical storage for temporary storage so that it is fully slowed down and cooled before being processed. The vertical cylinder warehouse is equipped with a ventilation fan, which can take out the remaining heat. And make the rice moisture evenly.
It is mainly used for separating brown rice from paddy making use of their differences in specific gravity and friction coefficient in three parts: paddy, brown rice, and a mix of both.
The rice milling machine is developed for rice milling, which is an advanced technology of the world rice mill whitener at present to make rice temperature down, bran content less, and broken increment lower.
The rice polishing process is to polish the rice surface by spraying water, which facilities the formation of a smooth gelatinous layer that prolongs the preservation time. Extended polishing chamber to produce high-quality rice.
Using the rice grading machine to sieve milled rice efficiently and accurately into several classes: head rice, large broken, medium broken, small broken, etc.
Rice Color Sorting
Using the rice color sorting machine to sort the bad, milky, chalky, paddy, and foreign materials out. The CCD signal while blanking is tested. If it is found that there are unqualified rice or impurities in the materials, the ejector will blow the defective goods in the hopper.
This rationed automatic weighing packing machine consists of a material box, a packing scale, a sewing machine, and a conveyor belt. It can cooperate work with all the model's rice mill production lines, and also for the packing bag capacity can choose 1-50kg per bag for your needs.