BS ISO 18573-2012 Conveyor belts Test atmospheres and conditioning period《输送带 试验大气和状态调节期》.pdf

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 18573:2012Conveyor belts Testatmospheres and conditioningperiodsBS ISO 18573:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 18

2、573:2012. Itsupersedes BS ISO 18573:2003 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/67, Conveyor belts.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include

3、 all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 77353 2ICS 53.040.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British

4、Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2012.Amendments issued since publicationDate Text affectedBS ISO 18573:2012 ISO 2012Conveyor belts Test atmospheres and conditioning periodsCourroies transporteuses Atmosphres dessai et dures de c

5、onditionnementINTERNATIONAL STANDARDISO18573Second edition2012-11-01Reference numberISO 18573:2012(E)BS ISO 18573:2012ISO 18573:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or

6、 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 ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax

7、 + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 18573:2012ISO 18573:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Preconditioning . 15 Standard atmospheres for condi

8、tioning and testing 26 Time interval between production and commencement of testing 27 Conditioning 27.1 Temperature and humidity control . 27.2 Temperature control only 37.3 Temperatures greater than or less than the standard laboratory test temperature 37.4 Position of test pieces during condition

9、ing 38 Testing . 3Bibliography 4BS ISO 18573:2012ISO 18573:2012(E)ForewordISO (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 c

10、ommittees. 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 t

11、he 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 Internatio

12、nal 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 th

13、e subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 18573 was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts), Subcommittee SC 3, Conveyor belts.This second edition cancels and replaces the first edition (I

14、SO 18573:2003), of which it consitutes a minor revision.iv ISO 2012 All rights reservedBS ISO 18573:2012ISO 18573:2012(E)IntroductionThe conditioning of test pieces prior to testing is commonly accepted as an essential practice in most, but not necessarily all, methods of test. Its purpose is to pro

15、vide a common ground base for the commencement of the test and to remove an unnecessary variable in the search for the optimum precision for the particular test.In order to meet these objectives, it is essential to standardize as many of the variables as possible.Conveyor belts, other than steel cor

16、d conveyor belts, contain a textile element. This can be highly hydrophobic or somewhat more hydrophilic. Similarly, the polymer layer or cover can be thermoplastic or subject to thermal ageing. Each of these factors can have a significant effect on the property of the conveyor belt. These factors n

17、eed to be taken into account when making a decision as to whether conditioning is necessary and, if so, what the most appropriate conditions would be. The provisions given in ISO 1391, ISO 235292and ISO 22313have been taken into account in the preparation of this International Standard. ISO 2012 All

18、 rights reserved vBS ISO 18573:2012BS ISO 18573:2012Conveyor belts Test atmospheres and conditioning periods1 ScopeThis International Standard specifies the temperature, humidity and time conditions used for the conditioning and testing of all types of conveyor belt, irrespective of whether they hav

19、e plastics or rubber covers. It also specifies the requirements for the time interval to be observed between production and testing of conveyor belt test pieces.Special conditions applicable to a particular test or material or simulating a particular climatic environment are not included.2 Normative

20、 referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 21183-1, Light conveyor belts Part 1: Principal

21、 characteristics and applications3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1standard atmospherespecified temperature and humidity in which samples are conditioned and testedNOTE See Clause 5.3.2standard conditioncondition reached by a conve

22、yor belt test piece when it is in equilibrium with a standard atmosphere3.3moisture equilibriumcondition reached by a conveyor belt test piece when, after free exposure to air in motion, there is no appreciable change in mass3.4conditioningexposure of a test piece to a standard atmosphere for a stip

23、ulated period of time immediately before testing, in order to improve the reproducibility of test results3.5thermal equilibriumcondition reached by a conveyor belt test piece when it is at a uniform temperature throughout its mass and is within 1 C of the temperature of its environment4 Precondition

24、ingIf the textile element of the conveyor belt is of a highly hygroscopic material or if the method of test is highly sensitive to differences in the moisture content of the test piece, it is highly desirable that moisture equilibrium be approached from the dry side of the moisture hysteresis curve.

25、 This shall be INTERNATIONAL STANDARD ISO 18573:2012(E) ISO 2012 All rights reserved 1BS ISO 18573:2012ISO 18573:2012(E)achieved by preconditioning the test pieces in an atmosphere having a relative humidity of no greater than 10 % and a temperature of between 60 C and 70 C.NOTE Air at 65 % relative

26、 humidity and 20 C, when heated at constant pressure to between 60 C and 70 C, has a relative humidity of approximately 5 %. Higher temperatures can lead to changes in the properties of some polymers.5 Standard atmospheres for conditioning and testingThe conditioning treatment required for each indi

27、vidual test should be stated in the relevant test method.The use of one of the following atmospheres shall be fixed by the particular standard or specification for each test. The choice of one of these alternatives will depend on the prevalent usage in individual countries and the variant used shall

28、 be reported in the test report.a) Atmosphere A temperature 20 C 2 C relative humidity 65 % 5 %b) Atmosphere B temperature 23 C 2 C relative humidity 50 % 5 %c) Atmosphere C (tropical) temperature 27 C 2 C relative humidity 65 % 5 %d) Atmosphere D (temperate temperature control only) temperature 23

29、C 2 C or 20 C 2 Ce) Atmosphere E (tropical temperature control only) temperature 27 C 2 C6 Time interval between production and commencement of testingFor all test purposes, the time between completion of production and the commencement of testing shall be no less than 24 h; this period is to includ

30、e the conditioning periods given in Clause 7. For light conveyor belts (as specified in ISO 21183-1) this period shall be extended to 5 days (120 h).Whenever possible, the maximum time between production and commencement of testing shall not exceed 3 months.NOTE Test results obtained on a product wh

31、ere the tests are conducted more than 3 months apart, can exhibit higher variations in repeatability and reproducibility than duplicate tests conducted within this timescale.7 Conditioning7.1 Temperature and humidity controlIf both the temperature and humidity need to be controlled (Atmospheres A, B

32、 or C; see Clause 5), the conditioning period shall be no less than 16 h immediately before testing. For light conveyor belts (as specified in ISO 21183-1), this conditioning period shall be extended to no less than 48 h. In the event of dispute, these conditioning periods shall be extended to no le

33、ss than 72 h.2 ISO 2012 All rights reservedBS ISO 18573:2012ISO 18573:2012(E)7.2 Temperature control onlyIf only the temperature needs to be controlled (Atmospheres D and E; see Clause 5), the conditioning period shall be no less than 3 h immediately before testing. In the event of dispute, this con

34、ditioning period shall be extended to no less than 72 h.7.3 Temperatures greater than or less than the standard laboratory test temperatureIf a temperature other than the standard laboratory temperature is specified without the need to control the humidity, the conditioning time shall be a period su

35、fficient for the test piece to reach temperature equilibrium with the environment, or a period required by the specification covering the material or product being tested.Guidance on the selection of conditioning times, which will ensure that equilibrium is reached, is given in ISO 235292.7.4 Positi

36、on of test pieces during conditioningDuring the conditioning period, the test pieces shall be positioned in such a manner that, as far as possible, the whole surface of the test piece is exposed without imposing any stress/strain on the test piece, and, unless otherwise specified in the method of te

37、st, the test pieces shall be conditioned in the absence of light or ionizing radiation.8 TestingUnless otherwise specified, testing shall be carried out at the same temperature and humidity at which the conditioning was performed. ISO 2012 All rights reserved 3BS ISO 18573:2012ISO 18573:2012(E)Bibli

38、ography1 ISO 139, Textiles Standard atmospheres for conditioning and testing2 ISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods3 ISO 2231, Rubber- or plastics-coated fabrics Standard atmospheres for conditioning and testing4 ISO 2012 All rights

39、 reservedBS ISO 18573:2012BS ISO 18573:2012ISO 18573:2012(E) ISO 2012 All rights reservedICS 53.040.20Price based on 4 pagesThis page deliberately left blankBSI is the independent national body responsible for preparing British Standards and other standards-related publications, information and serv

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