Rice mill PPT by om

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

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.

Basic flow chart of rice milling process

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.

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.

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.

DESTONNER

Separating paddy from stones

& pebbles before milling or

dehusking.

Equipment-destoner

Specification-

* vartical vibratry screen.

* aspirator-suck the husk.

* driven motor-2hp.

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.

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.

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.

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.

WEIGHING,PACKAGING,TRANPORT

ING

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.