ICS 65.060.01  
 
Reference number  
DRS 269 -3:2020  
© RSB 2020  
  
 RWANDA 
STANDARD  DRS  
269-3:2020  
 
2nd edition  
2020 -June  
 
Agroprocessing machine s— Test methods 
—  
 
Part 3 : Rice mill 
   
DRS 269 -3:2020  
©RSB 2020 - All rights reserved                  ii 
 In order to match with technological development and to keep continuous progress in industries, 
standards are subject to periodic review. Users shall ascertain that they are in possession of the latest 
edition  
 
 
 
 
 
 
 
 
© RSB2020  
All rights reserved. Unless  otherwise specified, no part of this publication may be reproduced or utilized 
in any form or by any means, electronic or mechanical, including photocopying and microfilm, without 
prior written permission from R SB. 
Requests for permission to reproduce thi s document should be addressed to : 
Rwanda Standards  Board  
P.O Box 7099 Kigali -Rwanda  
KK 15 Rd, 49  
Tel. +250 788303492  
Toll Free: 3250  
E-mail: info@rsb.gov.rw  
Website: www.rsb.gov.rw  
ePortal: www.portal.rsb.gov.rw  DRS 269 -3:2020  
iii                ©RSB2020 - All rights reserved  
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ .............................  v 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 General conditions for test and inspection  ................................ ................................ ........................  2 
4.1 Role of manufacturer/dealer  ................................ ................................ ................................ .................  2 
4.2 Test site conditions  ................................ ................................ ................................ ...............................  2 
5 Suspension of test  ................................ ................................ ................................ ................................  2 
6 Test preparation  ................................ ................................ ................................ ................................ .... 2 
6.1 Preparation of the rice mill for testing  ................................ ................................ ................................  2 
6.2 Test materials  ................................ ................................ ................................ ................................ ........  2 
6.3 Running -in and preliminary adjustments  ................................ ................................ ...........................  3 
7 Pre-test observation  ................................ ................................ ................................ ..............................  3 
8 Performanc e test  ................................ ................................ ................................ ................................ ... 3 
8.1 Operation of the rice mill  ................................ ................................ ................................ ......................  3 
9 Sampling  ................................ ................................ ................................ ................................ ................  3 
9.1 Data collection  ................................ ................................ ................................ ................................ ....... 3 
9.1.1  Duration of test  ................................ ................................ ................................ ................................ ...... 3 
9.1.2  Noise level  ................................ ................................ ................................ ................................ ..............  4 
9.1.3  Speed of c omponents  ................................ ................................ ................................ ...........................  4 
9.1.4  Energy consumption  ................................ ................................ ................................ .............................  4 
9.1.5  Data recording and observations  ................................ ................................ ................................ ........  4 
10 Laboratory analysis  ................................ ................................ ................................ ...............................  4 
11 Formula  ................................ ................................ ................................ ................................ ..................  4 
12 Test report  ................................ ................................ ................................ ................................ ..............  4 
Annex  A (normative)  Test materials for rice mill  ................................ ................................ ...........................  6 
A.1 Sample characteristics  ................................ ................................ ................................ .........................  6 
A.2 Quantity to be supplied ................................ ................................ ................................ .........................  6 
A.3 Sample preparation  ................................ ................................ ................................ ...............................  6 
Annex  B (nor mative)  Specification for rice mill  ................................ ................................ .............................  7 
12.1  General information  ................................ ................................ ................................ ..............................  7 
Annex  C (normative)  Sampling and measurements for test material  ................................ ....................  1112 
C.1 Sampling from different outlets  ................................ ................................ ................................ ..... 1112 
C.2 Handling of samples  ................................ ................................ ................................ .......................  1112 
C.3 Other measurements required during the test run  ................................ ................................ ...... 1112 
C.4 Measurement of fuel/power consumption  ................................ ................................ ........................  12 
C.4.1  For rice mill using engine as prime mover  ................................ ................................ .......................  12 
C.4.2  Using electric motors as prime mover  ................................ ................................ ..........................  1213 DRS 269 -3:2020  
©RSB 2020 - All rights reserved                  iv 
 Annex  D (normative)  Performance test data sheet  ................................ ................................ .....................  14 
Annex  E (normative)  Laboratory analysis  ................................ ................................ ................................  1819 
E.1 Laboratory analysis of input paddy  ................................ ................................ ..............................  1819 
E.1.1  Purity  ................................ ................................ ................................ ................................ ................  1819 
E.1.2  Moisture content  ................................ ................................ ................................ .............................  1819 
E.1.3  Crac ked grains  ................................ ................................ ................................ ................................  1819 
E.1.4  Weight per 1000 grains full grain test paddy  ................................ ................................ ...............  1819 
E.1.5  Weight of 1000 grains whole head brown rice  ................................ ................................ .............  1920 
E.1.6  Milled rice grain parameters  ................................ ................................ ................................ ..........  1920 
E.1.7  Weight of 1000 -grain whole head milled rice  ................................ ................................ ...............  1920 
E.1.8  Damaged grain  ................................ ................................ ................................ ................................  1920 
E.2 E.2 Laboratory analysis of samples from test rice mill  ................................ ..............................  1920 
E.2.1  Weight of 1000 grains whole head brown rice  ................................ ................................ .............  1920 
E.2.2  Coefficient of hulling  ................................ ................................ ................................ ......................  1920 
E.2.3  Coefficient of wholeness  ................................ ................................ ................................ ...............  1920 
E.2.4  Weight of 1000 grains whole head milled rice  ................................ ................................ .............  1920 
E.2.5  Grain parameters  ................................ ................................ ................................ ............................  2021 
E.2.6  Milling degree  ................................ ................................ ................................ ................................ .. 2021 
Annex  F (normative)  Laboratory analysis data sheet  ................................ ................................ .............  2122 
Annex  G (normative)  Formula used during calculations and testing  ................................ ...................  2324 
 DRS 269 -3:2020  
v                ©RSB2020 - All rights reserved  
 Foreword  
Rwanda Standard s are prepared  by Technical Committees and approved by R wanda Standards Board (RSB) 
Board  of Directors in  accordance with the procedures of RSB, in compliance with Annex 3 of the WTO/TBT 
agreement on the preparation, adoption and application of standards.  
The main task of technical committees is to prepare national standards.  Final Draft Rwanda S tandards 
adopted by Technical committ ees are ratified  by me mbers of RSB Board of Director s for publication and 
gazettment as Rwanda Standards.  
DRS  269-3 was prepared by Technical Committee RSB/TC 47, Steel, aluminium and related products.  
In the preparation of this standard, reference was made to the following standard  (s): 
1) XYZ: Title  
2) XYZ:Title  
The assistance de rived from the above source is hereby acknowledged with thanks.  
This second  edition cancels and replaces the first  edition (RS  269-3:2015 ), which has been technically 
revised.  
DRS 269 consists of the following parts, under the general title Agricultural machinery — Test methods : 
 Part 1: Price thresher  
 Part 2: Power operated maize sheller  
Part 3: Rice mill  
 Part 4: Heated air mechanical grain dryer  
 Part 5: Maize mill  
Committee membership  
The following organizations were represented on the Technical Committee on Steel, aluminium and related 
products  (RSB/TC 47 ) in the preparation of this standard.  
University of Rwanda/college of science and technology  
University of Rwanda/College of agriculture animal science and veterinary medicine  DRS 269 -3:2020  
©RSB 2020 - All rights reserved                  vi 
 Kabizu business group  
Rwanda Polytechnic/IPRC Kigali  
Rwanda Polytechnic/IPRC Ngoma  
Rwanda Polytechnic/IPRC Musanze  
RWANTECH Boilers  
Rwanda Inspectorate and competition authority  
Rwanda Institute for Conservation Agriculture  
ACER Ltd  
Rwanda  Standards Board (RSB) – Secretariat   DRS 269 -3:2020  
1                ©RSB2020 - All rights reserved  
 Agroprocessing machines — Test methods — Part 3 : Rice mill 
1 Scope  
This Draft Rwanda Standard specifies the methods of sampling, testing and inspection for rice mill . 
2 Normative references  
The following documents are referred to in the text in such a way that some or all of  their content constitutes 
requirements of this document.  For dated references, only the edition  cited applies. For undated references, 
the latest edition of the reference d document (including any amendments) applies.  
DRS 268 -3, Agroprocessing machines  — Specification — Part 3: Rice mill  
RS 236, Acoustics - Noise pollution  — Tolerance limit  
3 Terms and definitions  
For the purposes of this document, the terms and definitions gi ven in  RS 268 -3apply.  
ISO and IEC maintain terminological databases for use in standardization at the following addresses:  
— IEC Electropedia: available at http://www.electropedia.org/  
— ISO Online browsing platform: available at http://www.iso.org/obp  
3.1 
brewers rice  
small pieces or particles of grains that pass through a sieve having round perforations 1.4 mm in diameter  
3.2  
regular milled rice  
rice grain from which the hull, the germ, the outer bran layers and the greater part of the inner bran layers 
have been removed but part of the lengthwise streaks of the bran layers may still be present on 15 % to 40 % 
of the sample grains   
©RSB 2020 - All rights reserved                  2 
 3.3  
Under -milled rice  
rice grain from which the hull, the germ, the outer bran layer, and the greater part of the inner bran layer have 
been removed, but part of the lengthwise streaks of the bran layer may still be present on more than 40 % of 
the sample grains  
3.4  
well-milled rice  
rice grain from which the hull, the germ, the outer bran layer, and the greater part of the inner bran layer have 
been removed, but part of the lengthwise streaks of the bran layer may still be present on less than 15 % of 
the sample grai ns.  
4 General conditions for test and inspection  
4.1 Role of manufacturer/dealer  
The manufacturer/dealer shall comply with the test procedures of national testing authority.  
4.2 Test site conditions  
The rice mill shall be tested as installed for normal operation. The site shall have ample provisions for grain 
handling, temporary storage, and work space.  
5 Suspension of test  
5.1 If during the test run, the machine stops due to breakdown or malfunction s o as to affect the machine’s 
performance, the test may be suspended.   
5.2 The decision to suspend or to continue the test is at the discretion of the test engineer and concurred by 
the representative.  
6 Test preparation  
6.1 Preparation of the rice mill for tes ting 
6.1.1  A check shall be made by the manufacturer/client and testing authority that the rice mill has been 
assembled and installed in accordance with the instruction of the manufacturer.  
6.1.2  The rice mill shall be cleaned adequately for the purpose o f testing.  
6.2 Test materials  
The paddy to be used for testing shall be prepared in sufficient quantity following the procedure in Annex A.  DRS 269 -3:2020  
3                ©RSB2020 - All rights reserved  
 6.3 Running -in and preliminary adjustments  
6.3.1  Before the start of the test, the rice mill shall have undergone a breaki ng-in period.   
6.3.2  The rice mill shall be operated at the test site for sufficient duration with and without load.   
6.3.3  During the running -in period, the various adjustments of the rice mill shall be made according to the 
manufacturer’s recommendatio ns.   
6.3.4 No other adjustments shall be permitted during the test.  
7 Pre-test observation  
The specifications claimed by the manufacturer and the physical details given in Annex B shall be verified by 
the recognized testing authority.  
8 Performance test  
8.1 Operation of the rice mill  
8.1.1 The rice mill shall be operated at the manufacturer’s recommended setting of its components.  
8.1.2  The recommended feeding rate shall be maintained during the test run with a duration of at least 30 
minutes.   
8.1.3 For mu lti-pass rice mills with control tanks, these tanks shall be fully opened during the test runs.  
8.1.4 After the test -run, the milling area shall be cleaned and then prepared for the next test trial(s).   
8.1.5 This procedure shall be repeated for at least  three test trial(s).  
9 Sampling  
Sampling procedure is given in Annex C.  
9.1 Data collection  
9.1.1  Duration of test  
The duration of each test trial shall start with the feeding of the paddy into the intake hopper/intake pit and 
ends before bagging or at the start of  feeding of milled rice to the bagging bin.   
©RSB 2020 - All rights reserved                  4 
 9.1.2  Noise level  
9.1.2.1  The noise emitted by the machine, with or without load, shall be measured using a noise level 
meter both at the locatio n of the operators and baggers.  
9.1.2.2  The noise limit shall comply with  the requirements specified in RS 236.  
9.1.3  Speed of components  
9.1.3.1  The speed of the rotating shafts of the rice mill’s major components shall be taken using a 
tachometer.  
9.1.3.2  Measurements shall be taken with and without load for sub -clause 9.1.2 and 9.1.2 as specified in 
Annex D.  
9.1.4  Energy consumption  
9.1.4.1  Before the start of each test trial, the fuel tank shall be filled to its capacity and after each test; the fuel 
consumed shall be measured.   
9.1.4.2  In case an electric motor is used as a prime m over, a power meter shall be used to measure electric 
energy consumption.  
9.1.5  Data recording and observations  
Record sheet for all data and information during the test is given in Annex D. Observations to be taken 
during the performance test shall be recorded  in this sheet.  
10 Laboratory analysis  
10.1 Laboratory analysis is carried out to analyze the grain samples taken during the performance test.  
10.2 The laboratory procedures to be followed in the analysis are given in Annex E. Items to be determined 
shall be recorded in Annex F.  
10.3 The quality of milled rice samples from the rice mill shall be compared to the quality of milled rice using 
the labora tory rubber roll husker/huller and a laboratory whitener.  
11 Formula  
The formulas to be used during calculations and testing are  given in Annex G.  
12 Test report  
The test report shall inc lude the following information:  DRS 269 -3:2020  
5                ©RSB2020 - All rights reserved  
 a) title; 
b) summary of results;  
c) purpo se and scope of Test;  
d) methods of Test;  
e) conditions of the machine;  
f) description of the machine;  
g) results and discussions;  
h) obser vations (include pictures); and  
i) names and signatures of test engineers.  
 
  
©RSB 2020 - All rights reserved                  6 
 Annex  A 
(normative)  
 
Test materials for rice mill 
A.1 Sample characteristics  
Test materials to be used shall have the following characteristics:  
A.1.1  Variety: locally grown (as much as possible single variety)  
A.1.2  Grain Moisture Content: dried to a uniform moisture content of 14 %   
A.1.3  Purity: 98  %, minimum  
A.1.4  Type: Long and slender grains  
NOTE  long grains –palay whose average length of the full brown rice grain is above 6.5 mm slender grains – palay 
with whole milled rice grain having length/width ratio over 3.0  
A.2 Quantity to be supplied  
A.2.1 The amount of test material to be supplied shall be sufficient for at least 3h30 min of continuous milling 
operation for single pass rice mill.  
A.2.2  At least three test trials shall be conducted with minimum duration of 30 min per trial. The excess 
amount shall be used for running -in prior to the actual conduct of test trials.  
A.2.3  For test of multi -pass rice mill, the amount of test material to be supplied shall be sufficient for 5 h of 
continuous milling operation.   
A.2.4  At least three test trial s shall be conducted with minimum duration of 2 h per trial.  
A.3 Sample preparation  
Prepare the sample in such a way that test sample to be used for the running -in and in each test trial shall 
have identical characteristics in terms of moisture content and va riety  
  DRS 269 -3:2020  
7                ©RSB2020 - All rights reserved  
 Annex  B 
(normative)  
 
Specification for rice mill  
Name of Applicant (Distributor): _______________________________________________  
Address: __________________________________________________________________  
Tel No: ___________________________________________________________________  
Manufacturer Name : ________________________________________________________  
Address: __________________________________________________________________  
Tel No: ________________ ___________________________________________________  
Address: __________________________________________________________________  
12.1 General information  
Serial No: ______________________ Brand/Model: _______________________________  
Type :     _______________ _______ Make: _______________________________  
Production date of rice mill to be tested: __________________________________________  
Testing agency :_________________ Date of testing :______________________________  
Location of test:__________________ Tes t Engineer :______________________________  
Table B 1 — Items to be inspected  
 
Items  Manufacturer’s 
Specifications  Verification by the  
Testing Authority  
B.1 Main structure    
B.1.1 Overall dimensions (mm)    
B.1.1.1 Length    
B.1.1.2 Width     
©RSB 2020 - All rights reserved                  8 
 B.1.1.3 Height    
B.1.2 Weight (kg), if applicable    
B.2 Prime mover    
B.2.1 Electric motor    
B.2.1.1 Brand    
B.2.1.2 Type    
B.2.1.3 Make or manufacturer    
B.2.1.4 Serial number    
B.2.1.5 Rated power (kW)    
B.2.1.6 Rated speed (rpm)    
B.2.1.7 Phase    
B.2.1.8 Voltage (V)    
B.2.1.9 Current (A)    
B.2.1.10 Frequency (Hz)    
B.2.2 Engine    
B.2.2.1 Brand    
B.2.2.2 Model    
B.2.2.3 Make or manufacturer    
B.2.2.4 Type    
B.2.2.5 Serial number    
B.2.2.6 Rated power (kW)    
B.2.2.7 Rated speed (rpm)    
B.2.2.8 Displacement (cm3)    
B.2.2.9 Cooling system    
B.2.2.10 Starting system    
B.3 Intake hopper/Loading Pit    
B.3.1 Type    
B.3.2 Holding capacity (kg)    
B.3.3 Materials of construction    
B.3.4 Features    
B.4 Pre -cleaner    
B.4.1 Type    
B.4.2 Size    DRS 269 -3:2020  
9                ©RSB2020 - All rights reserved  
 B.4.3 Materials of construction    
B.5 Hulling unit    
B.5.1 Type    
B.5.2 Size    
B.5.3 Materials of construction    
b.5.4 Motor    
B.5.4.1 Rated power (kW)    
B.5.4.2 Rated speed (rpm)    
B.6 Paddy separator    
B.6.1 Type    
B.6.2 Number of trays/compartments    
B.6.3 Motor    
B.6.3.1 Rated power (kW)    
B.6.3.2 Rated speed (rpm)    
B.7 Destoner    
B.7.1 Type    
B.7.2 Motor    
B.7.2.1 Power (kW)    
B.7.2.2 Speed (rpm)    
B.8 Whitener    
B.8.1 Type    
B.8.2 Motor    
B.8.2.1 Power (kW)    
B.8.2.2 Speed (rpm)    
B.9 Polisher    
B.9.1 Type    
B.9.2 Motor    
B.9.2.1 Power (kW)    
B.9.2.2 Speed (rpm)    
B.10 Elevator(s)    
B.10.1 Type    
B.10.2 Number of units    
B.10.3 Size of buckets     
©RSB 2020 - All rights reserved                  10 
 B.10.4 Motor    
B.10.4.1 Power (kW)    
B.10.4.2 Speed (rpm)    
B.11 Rice sifter    
B.11.1 Type    
B.11.2 Size    
B.11.3 Number of screens    
B.11.4 Size of perforations (mm)    
B.11.5 Material of construction    
B.12 Bagging bin    
B.12.1 Capacity (kg)    
B.12.2 Material of construction    
B.13 Safety devices    
B.14 Special features    
 
 
 
 
 
 DRS 269 -3:2020  
11                ©RSB2020 - All rights reserved  
 Annex  C 
(normative)  
 
Sampling and measurements for test material  
C.1 Sampling from different outlets  
C.1.1  During each test trial three samples each shall be collected from the outlets of the different 
components (huller, paddy separator, destoner, whitener, etc.) of the rice mill to be analyzed in the laboratory.   
C.1.2  The minimum amount of sample to be take n shall be twice as much as what is needed for a particular 
analysis.   
C.1.3  The excess sample shall be used for reference purposes or for an eventual second check in case of 
review.  
C.2 Handling of samples  
C.2.1  All samples to be taken to the laboratory shall be placed in appropriate containers and properly 
labelled.  
C.2.2  If the sample is to be used for determining moisture content, it must be kept in dry and airtight 
containers.  
C.3 Other measurements required dur ing the test run  
C.3.1  Data shall be taken for the following:  
a) speed of rotating components; and   
b) noise level at operator’s and bagger’s location.   
C.3.2 For each data to be taken, there shall be a minimum of five observations. These shall be taken with 
and without load.   
C.3.3   Before taking of data, the feed rate, speed and other functional characteristics shall be stabilized.   
C.3.4  The time of recording shall be properly spaced during the whole duration of the test trials.   
©RSB 2020 - All rights reserved                  12 
 C.4 Measurement of fuel/power  consumption  
C.4.1  For rice mill using engine as prime mover  
C.4.1.1  The tank shall be filled to full capacity before the test.   
C.4.1.2  After the test, fill the tank with measured fuel to the same level before the test.   
C.4.1.3  When filling up the tank, care ful attention shall be paid to keep the tank horizontal and not to leave 
empty space on the tank.  
C.4.2  Using electric motors as prime mover  
C.4.2.1  Use a power meter to measure the voltage, current, and the total electric power consumption of the 
rice mill.   
C.4.2.2  There shall be three sets of data with a minimum of five observations per set taken with load and one 
set of data taken without load.   
C.4.2.3   Data shall be taken simultaneous with the collection of samples for laboratory analysis.  
 
 
 
 
 
 
 
 
 
 
 
 DRS 269 -3:2020  
13                ©RSB2020 - All rights reserved  
  
 
  
©RSB 2020 - All rights reserved                  14 
 Annex  D 
(normative)  
 
Performance test data sheet  
Test trial No.:______________    Test Engineers: ___________________  
Assistants:_________________    Test requested by: _________________  
Date: _____________________    Location: ________________________  
Machi ne: _________________    Manufacturer: ____________________  
Table D 1 — Data sheet  
ITEMS  Trial    
1  2   3  Average  
D.1 Conditions of crop       
D.1.1 Crop       
D.1.2 Source       
D.1.3 Variety       
D.1.4 Moisture content (%)       
D.2 Weight of input (kg)       
D.3 Input time (h)       
D.4 Input capacity (kg/h)       
D.5 Weight of milled rice (kg)       
D.6 Output time (h)       
D.7 Output capacity (kg/h)       
D.8 Milling time (h)       
D.9 Milling capacity (kg/h)       
D.10 Speed of components (rpm)       
D.10.1 Paddy cleaner       
D.10.1.1 Without load       
D.10.1.2 With load       
D.10.2 Paddy cleaner motor       
D.10.2.1 Without load       DRS 269 -3:2020  
15                ©RSB2020 - All rights reserved  
 D.10.2.2 With load       
D.10.3 Rubber roll (fixed)       
D.10.3.1 Without load       
D.10.3.2 With load       
D.10.4 Rubber roll (adjustable)       
D.10.4.1 Without load      
D.10.4.2 With load      
D.10.5 Rubber roll motor      
D.10.5.1 Without load      
D.10.5.2 With load      
D.10.6 Paddy separator      
D.10.6.1 Without load      
D.10.6.2 With load      
D.10.7 Abrasive whitener      
D.10.7.1 Without load      
D.10.7.2 With load      
D.10.8 Friction whitener      
D.10.8.1 Without load      
D.10.8.2 With load      
D.10.9 Rice Sifter      
D.10.9.1 Without load      
D.10.9.2 With load      
D.10.10 Main drive      
D.10.10.1 Without load      
D.10.10.2 With load      
D.11 Noise level, dB(A)      
D.11.1 Operator      
D.11.1.1 Without load      
D.11.1.2 With load      
D.11.2 Bagger      
D.11.2.1 Without load      
D.11.2.2 With load       
©RSB 2020 - All rights reserved                  16 
 D.12 Power consumption      
D.12.1 Power (kW)      
D.12.1.1 Without load      
D.12.1.2 With load      
D.12.2 Current (A)      
D.12.2.1 Without load      
D.12.2.2 With load      
D.12.3 Voltage (V)      
D.12.3.1 Without load      
D.12.3.2 With load      
D.13 Fuel consumed (L)      
D.14 Fuel consumption (L/h)      
 
D.15 Other observations  
D.15.1 Ease of loading  
___________________________________________________________________________ 
___________________________________________________________________________  
D.15.2 Ease of cleaning of parts  
_____________________________________________________________________ ______ 
___________________________________________________________________________  
D.15.3 Ease of adjustments  
___________________________________________________________________________ 
____________________________________________________________________ _______  
D.15.4 Ease of collecting output  DRS 269 -3:2020  
17                ©RSB2020 - All rights reserved  
 ___________________________________________________________________________ 
___________________________________________________________________________  
D.15.5  Safety  
___________________________________________________________________________ 
___________________________________________________________________________  
D.15.6  Labour requirements  
___________________________________________________________________________   
D.15.7  Failure or abnormalities that may be observed on the rice mill or its components parts during and after 
the milling operation  
___________________________________________________________________________  
 
 
 
 
 
 
 
  
©RSB 2020 - All rights reserved                  18 
 Annex  E 
(normative)  
 
Laboratory analysis  
E.1 Laboratory analysis of input paddy  
The steps in sampling input paddy for processing in the laboratory huller and laboratory whitener as well as 
determining the grain parameters are shown in Figure 1.  
E.1.1  Purity  
Each of the three 0.5 kg test paddy sample is cleaned and the components namely, the paddy and the 
impurities, are separated for weighing.  
E.1.2  Moisture content  
E.1.2.1 Five samples shall be taken for moisture content determination using a calibrated moisture meter.   
E.1.2.2  The mean moisture content from samples shall be taken as the moisture content of the test paddy.  
E.1.3  Cracked grains  
E.1.3.1  Three 100 -whole head grain sample is drawn for hand hulling to determine the percentage cracked 
brown rice.  
E.1.3.2  Each grain shall be hulled carefully by hand, taking care not to use undue rubbing force or high 
pressure to minimize mechanical stress on the grain.   
E.1.3.3  Each hulled grain or brown rice grains shall be examined for cracks under a magnifying lens again st a 
backlight through a translucent plate or light diffuser.   
E.1.3.4  Grains which show cracks or which have been broken in the process of hand hulling shall be counted 
as cracked grains.   
E.1.3.5  The mean value determined from the three 100 -grain sampl es shall be taken as the percentage 
cracked hand -hulled brown rice.  
E.1.4  Weight per 1000 grains full grain test paddy  
Three 1000 -grain sample is drawn and weighed as soon as possible.  DRS 269 -3:2020  
19                ©RSB2020 - All rights reserved  
 E.1.5  Weight of 1000 grains whole head brown rice  
Take three 1000 -whole head grai n samples from the brown rice sample and weigh.  
E.1.6  Milled rice grain parameters  
E.1.6.1  Three 100 -grain sample of milled rice from the laboratory whitener shall be weighed and separated 
into components of head rice, broken rice, and brewer’s rice.   
E.1.6.2  Each component shall be weighed individually to determine the percentage on weight basis  
E.1.7  Weight of 1000 -grain whole head milled rice  
Three 1000 -grain sample of whole head milled rice shall be drawn from the head rice component and then 
weighed.  
E.1.8  Damaged grain  
E.1.8.1  Three 100 -grain head milled rice samples shall be drawn from the head milled rice component and 
examined under a magnifying lens for grain damage.   
E.1.8.2  The percentage grain damage is taken as the mean value from three 100 -grain sample.  
E.2 E.2 Laboratory analysis of samples from test rice mill  
E.2.1  Weight of 1000 grains whole head brown rice  
Three 1000 -grain samples of whole head brown rice shall be drawn to determine the weight of 1000 grains.  
E.2.2  Coefficient of hulling  
Three samples of 100 grains o f huller output shall be drawn and separated into brown rice and unhulled paddy 
to determine the coefficient of hulling.  
E.2.3  Coefficient of wholeness  
E.2.3.1  Three samples of 100 grains brown rice sample is drawn and separated into broken brown rice and 
head b rown rice.   
E.2.3.2  The coefficient of wholeness is determined from the weight of the components and shall be taken as 
the mean of the three samples.  
E.2.4  Weight of 1000 grains whole head milled rice  
Three 1000 -grain samples of milled rice shall be taken and weighed.   
©RSB 2020 - All rights reserved                  20 
 E.2.5  Grain parameters  
The head milled rice recovery, total milling recovery, and percentage, on weight basis, of broken milled rice 
and brewer’s rice shall be determined from the nominal 200 -grain milled rice sample.  
E.2.6  Milling degree  
This parameter shall  be determined by calculating from the difference in weights of 1000 grains of whole head 
brown rice and 1000 grains of whole head milled rice.  
 
 DRS 269 -3:2020  
21                ©RSB2020 - All rights reserved  
 Annex  F 
(normative)  
 
Laboratory analysis data sheet  
The items to be determined during laboratory analysis shall be recorded in data sheet given in Table F.1  
Table F 1 — Data sheet  
Item  Trial   Mean  
1  2  3   
Control  Test  Control  Test  Control  Test  Control  Test  
F.1 Test paddy          
F.1.1 Purity (%)          
F.1.2 Moisture content, wet basis          
F.1.3 Weight of 1000 full paddy grains (g)          
F.1.4 Cracked handhulled brown rice          
F.2 Brown rice          
F.2.1 Weight of 1000 whole head brown rice 
(g)          
F.2.2 Chalky and immature (%)          
F.2.3 Yellow and fermented (%)          
F.2.4 Red rice (%)          
F.2.5 Coefficient of hulling          
F.2.6 Coefficient of wholeness          
F.2.7 Hulling efficiency (%)          
F.3 Milled rice          
F.3.1 Weight of 1000 whole milled rice (g)          
F.3.2 Damaged milled rice (%)          
F.3.3 Broken milled rice (%)          
F.3.3.1 based on input paddy          
F.3.3.2 based on total milled rice          
F.3.4 Brewer’s rice (%)          
F.3.4.1 based on input paddy          
F.3.4.2 based on total milled rice           
©RSB 2020 - All rights reserved                  22 
 F.3.5 Head milled rice Recovery (%)          
F.3.5.1 based on input paddy          
F.3.5.2 based on total          
F.3.6 Total milling recovery (%)          
F.3.7 Milling degree (%)          
 
 
 
 
 
 
 DRS 269 -3:2020  
23                ©RSB2020 - All rights reserved  
 Annex  G 
(normative)  
 
Formula used during calculations and testing  
 
a) Input capacity (kg/h)  
b) Output capacity (kg/h)  
c) Milling capacity (kg/h)  
d) Milling recovery (%)   
e) Coefficient of hulling, H c 
Hc  
f) Coefficient of wholeness,  
 
Where ;  
Wsthe weight of the whole brown rice  
Ts the weight of the total hulled samples  
g) Hulling efficiency , H e 
He = (Coefficient of hulling)× (Coefficient of wholeness)× 100  
h) Percent head rice (%)   
i) Broken rice (%)  
j) Brewer’s rice (%)  
DRS 269 -3:2020  
 
Price based on 24pages  
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