Rice Mill

Paddy or rice grains contain husk and brown rice. Brown rice, in turn, bran which consists of the outer layer and edible portion. Rice milling is stripping and removing the husk to obtain the edible portion for consumption. The process has to be completed carefully to improve the recovery of paddy or rice. The amount of recovery during milling depends on many factors such as variety of paddy, degree of milling required, quality of equipment used, operators etc. Milling is a process in which rice grains are transformed into a form suitable for human consumption and, therefore, must be done with extreme caution to prevent kernel breakage and improve recovery. The rice is further expanded to make a more visually white rice. After harvesting and drying, the paddy is subjected to the primary drilling operation which involves DE. - Removal of bran layers (polishing) before use. The rice obtained after milling in this process is called raw rice. The other process through which rice is obtained after milling is called "parboiling rice". About 60% of the total rice produced in India is subject to paraboiling. Milling losses can be qualitative or quantitative in nature. Quantitative or physical losses are revealed by low milling recovery while low head rice recovery or high percentage of broken kernels reflect qualitative losses in rice grains.

Method of Milling 

Traditional method

Before the advent of mechanical milling, the traditional method of rice milling was hand-operated. In fact, hand milled rice has received higher nutritional value than machine milling rice. In hand-pounding, many types of equipment are used such as: mortar and pestle, hand stone (grinder) etc.

Mechanical method

 With the introduction of mechanized mills, the method of manual pounding has steadily decreased as this machine cannot compete with the mills. Traditional mills in use can be classified into three main types:
  1. Huller mills 
  2. Sheller-Huller mills
  3. Sheller-Cone Polisher mills

Percentage of Rice During Milling Process 

  1. Rice                                    70%
  2. Rice Husk+bran layers    30%

Rice Mill Price in India 

 1. Single Pass Rice Mill Including Husker and Polisher
Rice Mill

Approx. Price: Rs 1.5 Lakh / Piece

Product Details:

Minimum Order Quantity1 Piece
Automation GradeAutomatic, Semi-Automatic
Machines RequiredHusker, Rice Polisher
Output (Kilogram/Hour)500
Capacity12 Ton / Day
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 2. Combined Mini Rice Mill & Pulveriser-Flour Mill
Rice Mill

Approx. Price: Rs 52,000 / Piece

Product Details:

Minimum Order Quantity1 Piece
Capacity150-180 Kg/hour
Press MaterialsRice, Masala
Automation GradeSemi-Automatic
PhaseSingle Phase
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 3. Mini Rice Mill
Rice Mill

Approx. Price: Rs 30,000 / Piece

Product Details:

Minimum Order Quantity1 Piece
Automation GradeSemi-Automatic
Press MaterialsRice
Capacity150 - 200 Kg. per Hr.
ColorBlue ,Red
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Working of Rice Milling 

There are some step to rice milling are as -

Paddy cleaning 

Paddy cleaning is given utmost importance to ensure proper functioning of the rice milling machinery, necessary to remove unwanted foreign matter. Rough rice is passed through a series of sistars and a closed circuit aspiration system is provided to remove dust and light impurities through positive air suction.
    Underseated material, heavier than rough rice (but of similar size), is removed via a de-stoner / gravity separator. This machine works on the principle of specific gravity. Stones and other heavy impurities, being heavy, remain on the surface of the screen, while thick rice, being lighter, liquefies the positive air gradient created by the external source.

    Paddy husk 

 The flow of a streamlined paddy is directed in a pair of rubber rolls, moving at different speeds, in opposite directions. A horizontal inward pressure is applied to the debris rollers, pneumatically. Due to the difference in the seeds of rotation, a blot force is generated on the surface of the hull (tow rubber roll by rubber with two sides) which breaks apart the surface / hull.
    The husk is of less specific gravity, then brown rice is separated by a closed circuit aspiration system.
    This process causes brown rice to break down. Although a proper horizontal inward pressure is the critical factor induced for rupture or rice, the de-hawking efficiency is equally important and should be maintained between 75 and 85%.

    Paddy Separation 

 The rice surface is smoother than the paddy surface. This difference in surface texture is used to separate brown rice from paddy through a paddy separator.
 The grain surface with smooth texture, being of greater width, is removed with red grains by precise shapes.

    Rice Whiteness 

Brown rice is rubbed with a rough surface, made using distinctive grid-shaped embossed stones. The layer of brown bran removes roughness. The radial velocity of the stone wheel, the grid size of the stones, the clearance between the stone surface and the second screen, and the external pressure on the outlet chamber of the white machines determine the extent of the whiteness.
    The layer of bran is removed from the surface if pneumatically exposed to a separate room for further processing / storage.

    Rice Polishing 

 The surface of white rice is still rough and smooth with a moistened rice polisher. The process involves rubbing the rice surface against the rice surface with mysterious air acting as a lubricant between the two surfaces. A modified version of this process is commonly used to produce a superfine silky finish on the rice surface.
    The layer of bran is removed from the surface if pneumatically exposed to a separate room for further processing / storage.

    Rice Grading

 Broken rice is removed by passing a lot through a cylindrical indented screen rotating at a particular speed. The broken / small grains fit into the indent of the rotating cylinder, are lifted by centrifugal force and the gravity bridge drops the grain into the trough. Adjusting the rotational speed and angle of the trough may vary the average length of the grain.

    Rice Color Sorting 

 The grains of rice that are destroyed by rice color sorting machines are removed from the colored grains. Photo sensors / CCD (charge couple devices) sensors generate voltage signals upon viewing the dislodged grains, which are then removed by the air jet generated through the solenoid valve.


1 comment :

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