SIST ISO 4150:2014

SLOVENSKI STANDARD
SIST ISO 4150:2014
01-maj-2014
1DGRPHãþD
SIST ISO 4150:1995
6XURYDNDYD$QDOL]DYHOLNRVWL5RþQRLQVWURMQRVHMDQMH
Green coffee or raw coffee -- Size analysis -- Manual and machine sieving
Café vert -- Analyse granulométrique -- Tamisage manuel et à la machine
Ta slovenski standard je istoveten z: ISO 4150:2011
ICS:
67.140.20 Kava in kavni nadomestki Coffee and coffee substitutes
SIST ISO 4150:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ISO 4150:2014

---------------------- Page: 2 ----------------------

SIST ISO 4150:2014
INTERNATIONAL ISO
STANDARD 4150
Third edition
2011-11-15
Green coffee or raw coffee — Size
analysis — Manual and machine sieving
Café vert — Analyse granulométrique — Tamisage manuel et à la
machine
Reference number
ISO 4150:2011(E)
©
ISO 2011

---------------------- Page: 3 ----------------------

SIST ISO 4150:2014
ISO 4150:2011(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2011
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 permission in writing from either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2011 – All rights reserved

---------------------- Page: 4 ----------------------

SIST ISO 4150:2014
ISO 4150:2011(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Sampling . 2
7 Procedure . 3
7.1 Test portion . 3
7.2 Selection of sieves . 3
7.3 Sieving and weighing . 3
7.4 Additional observations . 3
8 Statement of results . 4
9 Precision . 4
9.1 General . 4
9.2 Repeatability . 4
9.3 Reproducibility . 4
10 Test report . 4
Annex A (normative) Characteristics of perforated metal plate test sieves with round holes . 6
Annex B (normative) Characteristics of perforated metal plate test sieves with slotted apertures . 8
Annex C (informative) Interlaboratory . 9
Annex D (informative) Verification of mechanical equipment of sieving machines .10
Bibliography .12
© ISO 2011 – All rights reserved iii

---------------------- Page: 5 ----------------------

SIST ISO 4150:2014
ISO 4150:2011(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 4150 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 15, Coffee.
This third edition cancels and replaces the second edition (ISO 4150:1991), which has been technically revised.
iv © ISO 2011 – All rights reserved

---------------------- Page: 6 ----------------------

SIST ISO 4150:2014
INTERNATIONAL STANDARD ISO 4150:2011(E)
Green coffee or raw coffee — Size analysis — Manual and
machine sieving
1 Scope
This International Standard specifies a routine method for carrying out size analysis of green coffee by manual
and machine sieving using laboratory test sieves.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
ISO 3, Preferred numbers — Series of preferred numbers
ISO 2395, Test sieves and test sieving — Vocabulary
ISO 2591-1, Test sieving — Part 1: Methods using test sieves of woven wire cloth and perforated metal plate
ISO 3310-2, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal plate
ISO 3509, Coffee and coffee products — Vocabulary
ISO 4072, Green coffee in bags — Sampling
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2395 (for test sieves) and ISO 3509
(for coffee) apply.
4 Principle
A laboratory sample is separated into fractions according to size by manual (or machine) sieving, and the
results are expressed as percentage mass fractions.
5 Apparatus
5.1 Balance, capable of weighing to the nearest 0,1 g.
5.2 Nest of test sieves.
2
For the dimensions and sieving medium, the test sieves shall have a sieve surface area of between 550 cm
2
and 1 000 cm . Suitable test sieves are, for example, square sieves of size 300 mm, complying with the
requirements of ISO 2591-1, except that the approximate depth of the sieve may be reduced to 25 mm.
The perforated metal plate used as the sieving medium shall be made of metal of suitable strength, such as
stainless steel, ordinary steel or zinc, 0,8 mm to 1 mm thick. Each plate shall be perforated in accordance with
the requirements given in Annex A or Annex B.
The test sieves shall be marked by means of a label attached to the sieve giving the following details:
a) traditional numbering (see Annex A);
© ISO 2011 – All rights reserved 1

---------------------- Page: 7 ----------------------

SIST ISO 4150:2014
ISO 4150:2011(E)
NOTE The traditional numbering is given for information purposes. It corresponds to the nominal aperture size of
round apertures or to the width of slotted apertures, expressed in 64ths of an inch, closest to the metric dimension
adopted.
b) nominal aperture size or the dimensions of slotted apertures (see Annex B);
c) in the case of round holes, the diameter of the sieve current is determined in the verification (see Annex A);
d) reference to the International Standard(s) with which the sieve complies;
e) material of the sieving medium and that of the frame;
f) name of the firm (manufacturer or vendor) taking responsibility for the sieve;
g) identification number.
In terms of construction, the test sieve frames shall nest snugly with each other and with the lid and receiver.
The frame shall be smooth and the seal of the sieve so constructed as to prevent lodging of the coffee beans
being sieved.
For verification, new test sieves shall be tested (for example using the methods described in ISO 3310-2) and
a certificate shall be available to this effect. Periodic checking should also be performed, since some changes
in the dimensions of the apertures can occur after a period of use.
5.3 Test sieves.
5.3.1 Test sieves with round holes, 11 sieves (see Annex A).
5.3.2 Test sieves with slotted holes, 7 sieves (see Annex B).
5.4 Lid.
The lid shall comply with the requirements of ISO 2591-1.
5.5 Receiver.
The receiver shall comply with the requirements of ISO 2591-1.
5.6 Machine for sieving, having the following features.
a) The results obtained over each sieve shall be equal to using the manual method. In Annex D, a guide is
presented to carry out this verification.
b) The machine shall contain a tray to allow for the assembly of a set with any number of sieves in order to
carry out a complete analysis.
c) It shall consist of sieves which are easy to fix.
d) It shall have an adjustable timer in the 0 min to 3 min range.
6 Sampling
Take a laboratory sample of 300 g, prepared in accordance with ISO
...