FLOUR MILLING PROCESS
It is made up of concrete, steel and cement. A pit is dig in the soil below the ground level
about 2 to 2.5 mtrs. depth. It is covered with a net of 10 mm round steel duly welded with 5
mm round at a particular distance.We can put about 50 bags of 100 Kg. weight in this pit at
There is a controlled mechanical system for opening the gate of Intake Hopper to Ist
machine. It is a rotary drum type sieving machine which can separate out the fine dust by
aspiration system developed by -ve pressure and thrash, jute sutli, lumps etc. will be
separated out by sieving.
After sieving through the Drum Sieve, the material will feed in vibro type Seed Cleaner by
gravity. The impurities which are bigger or smaller than the size of seed, will be separated
out by sieving with the help of different size sieves and the light impurities will be separated
out by Aspiration System. These light impurities will be collected in the Dust Cyclone.
After sieving the material from Seed Cleaner, the material will go into the 2nd single Bucket
Elevator by gravity. This Elevator will lift the material vertically and feed it in the Worm
Conveyor which is fitted on the top of Ist & 2nd Concrete Bins. The cleaned material will go
into Ist & 2nd Bins. These bins are designed for multiple hopper from the bottom side. The
output flow of the material can be controlled with variable pocket feeder and the material
can be put in the Worm Conveyor. The Worm Conveyor takes the material from Ist & 2nd
Bins to feed it to Elevator by gravity.
Elevator lifts the material vertically and feeds it to the Gravity Separator Cum De-stoning
machine. In this machine we can separate out heavy metals, stones, glass pieces and also
the light impurities from the seed. Thereafter, the wheat will go to scouring machine by
gravity. In the scouring machine dust is removed from the upper layer of wheat by friction.
Dust and some part of bran is separated out from the wheat by sieving. Aspiration channel
is also provided with Scouring machine for further cleaning of the wheat by -ve pressure of
air stream. From the Scourer Aspiration channel the wheat goes to Intensive Dampner
through Bucket Dampner by gravity system with the help of Bucket Dampner where
measured quantity of water will be added in the wheat. Water will be mixed immediately with
the help of Intensive Dampner. From Intensive Dampner wheat will go to single Bucket
Elevator No. by gravity.
Elevator lifts the material vertically and feeds it into Worm conveyor No. W3 and feeds the
wheat in Bin No. I for conditioning. The wheat is kept in the conditioning for 16-24 hours
depending upon the variety of wheat and atmospheric temperature.
After conditioning, the wheat is taken out from the multiple hopper. This wheat is feeded in
the Elevator . through Worm Conveyor
Elevator lifts the material vertically and puts it in the second Intensive Dampner through
Bucket Dampner. Desired moisture is added here and the material is put in Bin s for about
4 to 6 hours.
Material is taken out from the Bin No. VII & VIII through the conveyor and is feeded into the
Elevator by gravity.
Elevator lifts the material vertically and feeds it into the Scouring/Brush Machine, so that
the bran could be removed from the upper layer of wheat. This bran is separated by
sieving and aspiration channel. Then this material goes to final Seed cleaner by gravity.
The Seed Cleaner finally performs the cleaning of the seed and keeps the material in
Worm conveyor and then it goes to Elevator.
Bucket Elevator lifts the material vertically and feeds it into Milling Bin. From Milling Bin it
goes to Ist break of Roller Mill. In Roller Mill material is grinded with the help of Chilled Cast
Iron Rolls. After grinding, the material is lifted vertically by pneumatic conveying system
and feeded into the Plan Sifter through Pneumatic cyclone and air Lock.
In the Plan Sifter we can sieve the material into many segments. The final product goes to
Worm conveyor and then packing. Intermediate product goes to Purifier machine for
further purification. Desired quantity of Sujji is taken out for packing and the remaining
material goes to Roller Mill for further grinding and sieving. Coares material is also goes to
further grinding and sieving. This process is continued in sequence upto desired product.
In the whole process we grind the wheat in grooved rolls softly, so that purest form of Bran
can be obtained. In this process by separating the bran we can get Samolina, Sujji in the
purest form. In the intermediate product where we can not separate out the bran from
Semoline, the Semoline obtained at this stage is called Atta.
Wheat Flour Milling Flow Diagram
Article by MECPRO Heavy Engineering Limited.