1. No category

Rice De-husking machine for domestic level brown rice production

Introduction-
Rice grain is surrounded by a hard coat or husk, which protects the germ and the
endosperm, the energy-rich starchy centre of the grain. For making rice (paddy) palatable
for human consumption, this protective layer is removed during rice hulling processes.
During rice hulling in process (with conventional rice hullers) outer cover (hard coat) and
inside bran (brown coat) get removed to produce white policed rice.
The brown bran coating of has many nutrients and dilatory benefits
(http://timesofindia.indiatimes.com/life-style/health-fitness/diet/Why-brown-rice-is-healthierthan-white/articleshow/19004946.cms). With increasing awareness on brown rice
consumption, demand for it is also increasing with health conscious community. This gives
scope for production of brown rice at domestic level as low cost , cottage scaled value
addition business for farmers , rural youth, SHGs. With this background we at Vigyan
ashram (Pabal) have developed Rice De-husking machine (prototype). The lab trials are
successfully completed with following detailsThe said machine is developed for producing brown rice at domestic level. The machine
specifications are as followParticular
Product name /Model
number
Size / material used
Specifications
Rice dehiscing Machine 1-10

Size - L-800mm,W600mm,H-1400mm

Body MS structure with
grade de-husking rubber plats

Weight - Max Approx wt
100-125kg

Hopper size – 10 Kg

Exhaust blower
Motor

1hp motor ( Crompton
greaves ) with 230V AC, 0.75A
Capacity

10 Kg / Hr (May vary with
Rice variety / moisture
content)
Rice-de-husking machine (Prototype)
 Comparison with convention rice-hullers available in market :-
Sr.
No.
1
Specification
Power supply
10 Hp Rice Huller
(Semi-automated)
3 ph
40 Hp Rice huller
(Fully automated )
3 ph
2
Horse power
10 hp
Total 36 hp
3
Final product
2 Stage Polished
rice
Polish rice
4
Processing
stages
2 Stage (1st StageHulling , 2nd StagePolishing )
5
Crushing
mechanism
6
Flour area
Steel rod
horizontally placed
in casing
4*2ft & 5*3ft
6 ( Elevator,
Colander, Destoner, Crusher,
separator, Polisher
)
Roller rubber is
used
7
Production
rate
8
9
10
11
VA model
Remark on VA
model
1 ph
Cottage /
domestic scale
operation
1 hp
Low power
consumption
Brown rice
Brown rice
(depends on
with nutrient
pressure applied retention
on crushing
wheel)
1 ( Single stage
Easy
de-husking)
operation, low
maintenance.
Total 40*10ft
Plates having
rubber is placed
horizontally
3*2fts
40 kg/hr
1 ton/hr
10 kg/ hr
Price
Breakage
₹ 70000/10 to 15% (depends
on quality of
paddy)
₹ 700000/15 to 20%
(depends on
quality of paddy)
Labor
Percentage
Nearly 3 to 4
Almost 100% after
polishing
Nearly 2
Almost 100% after
polishing
₹ 20000/5 to 10%
(depends on
quality of
paddy)
Single operated
85% to 90%
(depends on
quality of
paddy)
Occupy less
area
Low capacity
(Domestic
use)
Low cost
Less breakage
Low labor
Note  Conventional rice huller even removes part of bran layer while doing single pass hulling.
 Breakage due to using steel rod for hulling in rice mills.
 Future development Long kernel’s paddy like Basmati variety make blockage in passage.
 Machine is not useful for hard coating paddy like Mahadi.
We have planned to overcome these issues in next model of machine.

Lab trial results on different rice varieties-
Sr.
no.
Variety of rice
(Local name)
1
2
3
4
5
6
7
8
Kamal bhaat
Var. No. 4008
Kasbai
Kalisaal
Mahadi
Basmati
Kala bhaat
Indrayani

Percentage
of rice
obtain
89%
90%
83%
86%
66%
85%
96%
90%
Remark
Machine runs smoother
Machine runs smoother
Machine runs smoother
Machine take load
More rubber abrasion
Blockage in hopper due to long paddy size
High quality is achieved
Machine runs smoother
Variety –vise de-husking photo specimens -
Acknowledgment –
This work is done with technical and financial support of Department of Science &
technology (Core support project) and PRAJ Foundation, Pune (TIED project).
Sample of rice from 10hp rice huller :-