This document summarizes the different processes involved in a rice mill, including cleaning, parboiling, drying, destoning, shelling, separation of paddy and brown rice, whitening to remove bran layers, grading to reduce broken rice, and final weighing, packaging and transportation. The key steps are cleaning of impurities from paddy, parboiling to improve milling quality, drying, destoning, shelling to remove husks, separation of components using trays and aspiration, whitening using an abrasive stone cone to remove bran layers, grading by size, and final weighing and packaging for transportation.

1. BRSM college of Agricultural engineering & Technology Mungeli IGKV Raipur
Course Name - Seminar
Course No. - AE-498
Seminar On The Different Process in Rice Mill Presented by
OM PRAKASH SURYAWANSHI
B.TECH (AGRIL.ENGG.)
4TH YEAR

2. INTRODUCTION
Today rice is one of the most important & major food grain of the world.
Nearly 1/2 to 2/3 of total world population has totally adopted rice as their main food.
Rice milling technique improve the nutritional, cooking & Eating quality of rice.

3. Basic flow chart of rice milling process

4. CLEANING
Removing of foreign matter from paddy,sach as stone, pebbles, dirt, dust & husk.
Equipment-vibrating paddy cleaner.
Specification-
* No. of screen-8.for
(2-paddy,2-stones,2-hask,2- dust).
* Screen openings-
(0.20mm,0.8mm,0.6mm)
* Aspirator-husk.
* Moter-2hp.

5. Parboiling of paddy
Paddy is soaked & wet paddy is heated then dried.
To achieve maximum recovery of head rice & to minimize breakage during milling.
Equipment-vertical 12 tanks.
It is carried out three steps-
soaking-hot water at 800C for 6 hr.
Steaming-7.5 kg/ cm2 for 20 min.

6. DRYING
LSU(Lousiana State University ) drying is mechanical hot air dryer.
During the first pass paddy should be dried to mc. of 16-17% & them tempered for 3-4hr.
Steam-7.5 kg/cm2.for 3-4hr.
Dried paddy at 13% mc.

7. DESTONNER
Separating paddy from stones & pebbles before milling or dehusking.
Equipment-destoner
Specification-
* vartical vibratry screen.
* aspirator-suck the husk.
* driven motor-2hp.

8. SHELLING
Separating husk from the paddy grain.
Paddy grain is passed between two resilient surface moving at different speed in the opposite direction.
Equipment-rubber-roll Sheller.
Specification-
*dia.of roller -220 to 260mm.
* speed ratio-1:0.75 to 1:0.80.
* thickness of roller -15 to 30.
* hardness of coating- 90 to 95 shore.

9. PADDY SEPARATOR
Separating paddy from brown rice.
Equipment-tray separator
Specification-
* No. of tray-10 to 15.
* Position of tray-mounted one
above the other 5cm a part.
* Front positions is inclined.
* speed-300rpm.
* driven motor-2hp.

10. WHITENER
Removal of bran layers from brown rice.
Equipment- vertical whitening cone.
Specification-
* cast iron cylinder with abrasive stone coating.
* A wire screen is fixed around the cone.
* Distance between coating & screen- 4.5 to 6mm.
* Bran aspirator- remove the bran layer.
* driven motor-5 hp.

11. GRADER
The grader is use for obtain higher quality rice, which contains less broken.
It is cylindrical in shape & intendent on the inner side.
Driven motor-2hp.

12. WEIGHING,PACKAGING,TRANPORTING
The rice obtained from grater is filled in the jute bags & weigh on the weighing machine.
* Bags-25kg,50kg.
After that transportation by trucks, tractors to the buyer.