ISO-15793-2000.pdf
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1、Reference number ISO 15793:2000(E) ISO 2000 INTERNATIONAL STANDARD ISO 15793 First edition 2000-12-15 Durum wheat semolinas Determination of the undersize fraction Semoules de bl dur Dtermination du taux daffleurement Copyright International Organization for Standardization Provided by IHS under lic
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7、ail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2000 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 09:02:02 MDTNo reproduction or networking permitted witho
8、ut license from IHS -,-,- ISO 15793:2000(E) ISO 2000 All rights reservediii 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
9、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 clo
10、sely 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 3. Draft International Standards adopted by the technical committees are circulated
11、 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 International Standard may be the subject of patent rights. ISO shall not be held
12、 responsible for identifying any or all such patent rights. InternationalStandardISO 15793waspreparedbyTechnicalCommitteeISO/TC 34,Foodproducts, Subcommittee SC 4, Cereals and pulses. Annex A of this International Standard is for information only. Copyright International Organization for Standardiza
13、tion Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 09:02:02 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9
14、980755100 Not for Resale, 04/23/2007 09:02:02 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARDISO 15793:2000(E) ISO 2000 All rights reserved1 Durum wheat semolinas Determination of the undersize fraction 1Scope This International Standard specifies a m
15、ethod for the determination of the undersize fraction of durum wheat semolinas, which is an important characteristic. It is applicable to samples of at least 1 kg of durum wheat semolina obtained solely by comminution, without subsequent combination, having a moisture content higher than 10 % and pa
16、ckaged in fully filled airtight packaging. It is not applicable to determinations carried out using sieves of aperture size below 160 ?m. NOTEDetermination of the undersize fraction is sometimes termed “granulation of semolinas“. 2Normative reference The following normative document contains provisi
17、ons which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate
18、the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 712, Cereals and cereal p
19、roducts Determination of moisture content Routine reference method. 3Term and definition For the purposes of this International Standard, the following term and definition applies. 3.1 undersize fraction of semolina by convention, the percentage of semolina which passes through the sieve specified f
20、or the semolina in question, under the operating conditions described in this International Standard 4Principle The semolina under test is sieved using a chosen sieve of specified aperture size, in accordance with the procedure described in this International Standard. 5Apparatus Usual laboratory eq
21、uipment and, in particular, the following. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 09:02:02 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15793:2000(E) 2 I
22、SO 2000 All rights reserved 5.1Laboratory sieving machine1?, capable of being set at 200 r/min ? 5 r/min as well as at sieving amplitudes of 30 mm ? 2 mm and 60 mm ? 2 mm, and equipped with a sieve blocking system. 5.2Circular sieve, with sieving medium, cover and receiver, in stainless steel or sim
23、ilar material, having the following characteristics: a)frame diameter: 200 mm; b)useful diameter of sieving medium: 185 mm ? 5 mm, corresponding to a sieving surface area of approximately 270 cm2; c)height: 20 mm minimum; d)aperture size (or void): the following list gives examples of aperture sizes
24、2?of sieving media currently used in European and international transactions: ?160 ?m ? 6,9 ?m, ?180 ?m ? 7,6 ?m, ?200 ?m ? 8,3 ?m, ?250 ?m ? 9,9 ?m, ?300 ?m ? 11 ?m, ?315 ?m ? 12 ?m, ?425 ?m ? 15 ?m, ?500 ?m ? 18 ?m. 5.3Rubber balls (eight), having a diameter of 18 mm ? 1 mm and a mass of 5 g ? 0,5
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