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1、 Reference number ISO 4195:2007(E) ISO 2007 INTERNATIONAL STANDARD ISO 4195 First edition 2007-02-15 Conveyor belts with heat-resistant rubber covers Heat resistance of covers Requirements and test methods Courroies transporteuses avec revtements caoutchouc rsistant la chaleur Rsistance la chaleur d
2、es revtements Exigences et mthodes dessai Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 11:01:45 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4195:2007
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6、O 2007 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 ISOs member body in the
7、 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 copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2007 All rights reserved Copyright International Organization for Standardization Provided by IHS und
8、er license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 11:01:45 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4195:2007(E) ISO 2007 All rights reserved iii Foreword ISO (the International Organization for Standardization) is a worldwide
9、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 c
10、ommittee. 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 acco
11、rdance 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 requi
12、res 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 4195 was prepared by Technical
13、 Committee ISO/TC 41, Pulleys and belts (including veebelts), Subcommittee SC 3, Conveyor belts. This first edition of ISO 4195 cancels and replaces ISO 4195-1:1987 and ISO 4195-2:1988, of which it constitutes a technical revision. Copyright International Organization for Standardization Provided by
14、 IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 11:01:45 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr
15、/9960866100 Not for Resale, 04/24/2007 11:01:45 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 4195:2007(E) ISO 2007 All rights reserved 1 Conveyor belts with heat-resistant rubber covers Heat resistance of covers Requirements and test methods 1
16、Scope This International Standard specifies requirements and test methods for the relative level of heat resistance of conveyor belt covers made of rubber. It gives the permissible variations of hardness, elongation at break and tensile strength after exposure to heat. It is applicable only to those
17、 conveyor belts having a cover thickness greater than or equal to 4 mm. It is not suitable or valid for light conveyor belts as described in ISO 21183-11. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the
18、edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 37, Rubber, vulcanized or thermoplastic Determination of tensile stress-strain properties ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardne
19、ss between 10 IRHD and 100 IRHD) ISO 188, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance tests ISO 18573, Conveyor belts Test atmospheres and conditioning periods ISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods 3 P
20、erformance requirements When tested in accordance with the method specified in Clause 4, the permissible variations in hardness, elongation at break and tensile strength shall be in accordance with Table 1. Copyright International Organization for Standardization Provided by IHS under license with I
21、SO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 11:01:45 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4195:2007(E) 2 ISO 2007 All rights reserved Table 1 Permissible variations Variation for belt class Cover characteristic 1 2 3 Hardness (IRHD) v
22、ariation of initial value maximum value + 20 85 + 20 85 + 20 85 Elongation at break (%) variation of initial value minimum value 50 200 50 200 55 180 Tensile strength (N/mm2) variation in percentage of initial value minimum value 25 12 30 10 40 5 4 Test method 4.1 Principle The following properties
23、are measured, before and after exposure to heat according to 4.3.1: hardness of covers in accordance with ISO 48; elongation at break of covers in accordance with ISO 37; tensile strength of covers in accordance with ISO 37. NOTE The temperatures selected for the tests are usually not those correspo
24、nding to the temperature of the product to be transported; they are generally lower to take account of a) the possibility of the conveyor belt cooling, and b) the fact that contact between the product and the conveyor belt will not equalize the temperature. 4.2 Classification Conveyor belts shall be
25、 classified as follows: Class 1: resistant to test temperatures of up to 100 C. Class 2: resistant to test temperatures of up to 125 C. Class 3: resistant to test temperatures of up to 150 C. These classes do not correspond to the temperature of the transported product as mentioned in the Note to 4.
26、1. Depending on the use for which the belt is intended, the manufacturer should state the class to be used for assessing compliance with this International Standard. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100
27、 Not for Resale, 04/24/2007 11:01:45 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4195:2007(E) ISO 2007 All rights reserved 3 4.3 Procedure 4.3.1 Exposure to heat Cut a sample of belt of full thickness measuring 400 mm 400 mm from the centre of the belt at a distance
28、 of at least 100 mm from the edges. Place it in an air oven in accordance with ISO 188 for 7 days at a temperature of 100 C for class 1 belts, 125 C for class 2 belts or 150 C for class 3 belts. After exposure to heat, remove the belt sample from the oven and leave it to cool. 4.3.2 Preparation of t
29、est pieces for evaluating properties 4.3.2.1 Test pieces for measuring hardness of covers The test pieces shall either be the belt sample itself or covers removed from the belt by cutting away the covers from the belt sample. Test pieces shall be lightly buffed on each surface but left at maximum th
30、ickness. Condition the test pieces for 24 h at a temperature of (23 2) C and a relative humidity of (50 5) % (atmosphere B in accordance with ISO 18573). 4.3.2.2 Test pieces for measuring elongation at break and tensile strength Cut away the covers from the belt samples treated as described in 4.3.1
31、 and bring them to a thickness of (2 0,2) mm by cutting on both faces and finishing off by a light buffing. Condition the test pieces for 24 h at a temperature of (23 2) C and a relative humidity of (50 5) % (atmosphere B in accordance with ISO 18573). For belts with a textile carcass, the test resu
32、lts of which can be affected by the humidity, a temperature of (20 2) C and a relative humidity of (65 5) % (atmosphere A in accordance with ISO 18573) may be selected, by agreement between the parties concerned, provided that this is clearly indicated in the test report. In the special case of trop
33、ical conditions, reference should be made to ISO 23529 temperature (27 2) C and relative humidity (65 5) %, atmosphere C in accordance with ISO 18573. 4.3.3 Determination of properties 4.3.3.1 Hardness Using the test pieces prepared as described in 4.3.2.1, measure the hardness of covers using one o
34、f the methods specified in ISO 48, according to the available thickness of the rubber material. 4.3.3.2 Elongation at break and tensile strength, Using the test pieces as described in 4.3.2.2, measure the elongation at break of covers and tensile strength in accordance with ISO 37. 4.3.3.3 Initial v
35、alues Determine the initial values of hardness, elongation at break and tensile strength by measuring these properties using test pieces cut from the same belt and prepared as described in 4.3.2, but without exposure to heat. NOTE Users of this International Standard need to be aware of the limitati
36、ons of the results obtained in that two measurements do not provide a complete picture of the rate of change of the measured properties with time. The two points obtained do not allow the path of the curve relating the measured properties to time to be determined. Figure 1 illustrates this in that t
37、he curve between the two points shown could follow any number of paths; although for the purposes of illustration, three possible paths, A, B and C, are shown. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not f
38、or Resale, 04/24/2007 11:01:45 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4195:2007(E) 4 ISO 2007 All rights reserved Key X time Y measured property Figure 1 Changes in measured properties with time 4.4 Expression of results Record the results for the hardness of c
39、overs, the elongation at break of covers and the tensile strength of covers for the samples not exposed to heat and those exposed to heat. Calculate the variation in hardness, elongation at break and breaking strength between the results obtained for the samples not exposed to heat and those obtaine
40、d for the samples exposed to heat. 5 Test report The test report shall contain the following information: a) reference to this International Standard (i.e. ISO 4195); b) identification of the conveyor belt tested; c) the belt class as given in 4.2. d) the test piece used (see 4.3.2) e) the condition
41、s of exposure to heat; f) details of the conditioning used; g) the results of the test as described in 4.4; h) date of the test. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 11:01:45
42、MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4195:2007(E) ISO 2007 All rights reserved 5 Bibliography 1 ISO 21183-1, Light conveyor belts Part 1: Principal characteristics and applications Copyright International Organization for Standardization Provided by IHS under
43、 license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 11:01:45 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4195:2007(E) ICS 53.040.20 Price based on 5 pages ISO 2007 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 11:01:45 MDTNo reproduction or networking permitted without license from IHS -,-,-
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