1、 Reference numberISO 7267-1:2008(E)ISO 2008INTERNATIONAL STANDARD ISO7267-1Third edition2008-08-01Rubber-covered rollers Determination of apparent hardness Part 1: IRHD method Cylindres revtus de caoutchouc Dtermination de la duret apparente Partie 1: Mthode DIDC ISO 7267-1:2008(E) PDF disclaimer Th
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5、UMENT ISO 2008 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 bod
6、y 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 copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedISO 7267-1:2008(E) ISO 2008 All rights reserved iiiForeword ISO (the
7、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
8、 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 electrotechnic
9、al 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 bo
10、dies 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 an
11、y or all such patent rights. ISO 7267-1 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 2, Testing and analysis. This third edition cancels and replaces the second edition (ISO 7267-1:1997), which has been revised primarily to update the normative reference
12、s. ISO 7267 consists of the following parts, under the general title Rubber-covered rollers Determination of apparent hardness: Part 1: IRHD method Part 2: Shore-type durometer method Part 3: Pusey and Jones method ISO 7267-1:2008(E) iv ISO 2008 All rights reservedIntroduction The hardness of a roll
13、er covering has traditionally been determined on the finished roller, since it is this hardness that is critical to the correct functioning of the roller in its end application. Values of hardness, determined by whichever method is chosen, are therefore dependent not only on the method employed and
14、on the rubber, but also on the diameter of the roller, the thickness of the covering and, in the case of thin coverings, on the nature of the roller core. For this reason, the term “apparent hardness” is used to distinguish between the values obtained by methods described in the various parts of thi
15、s International Standard and those that would be obtained for the rubber if it was possible to use the standard test methods for standard test pieces forming the subjects of other International Standards. Since rollers vary considerably in size, construction and end use, and in view of the fact that
16、 hardness determinations are made for such different purposes as specification and factory process control, it has not been possible to standardize on one test method. Consequently, three methods are described (see Foreword), each capable of standing alone. INTERNATIONAL STANDARD ISO 7267-1:2008(E)
17、ISO 2008 All rights reserved 1Rubber-covered rollers Determination of apparent hardness Part 1: IRHD method WARNING Persons using this part of ISO 7267 should be familiar with normal laboratory practice. This part of ISO 7267 does not purport to address all of the safety problems, if any, associated
18、 with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. CAUTION Certain procedures specified in this part of ISO 7267 may involve the use or generation of substances, or the generation
19、of waste, that could constitute a local environmental hazard. Reference should be made to appropriate documentation on safe handling and disposal after use. 1 Scope This part of ISO 7267 specifies a method for the determination of the apparent hardness, expressed in International Rubber Hardness Deg
20、rees (IRHD), of vulcanized- or thermoplastic-rubber roller covers. The method is similar in principle to the methods used for the determination of the hardness of rubber in ISO 48 in that it consists essentially of measuring the depth of penetration of a spherical indentor operating under a specifie
21、d force. The apparatus used is similar to that described in ISO 48, having a base specifically designed for application to roller covers and similar curved surfaces. NOTE With some rollers, there may be significant variation in the thickness of the rubber over the surface of the roller, which could
22、affect the measured apparent hardness. 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 amendmen
23、ts) applies. ISO 48:2007, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD) ISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods 3 Time interval between forming and finished grinding, and testing
24、 Tests shall not be carried out less than 16 h after forming and/or finished grinding and, for arbitration purposes, not less than 72 h after forming. ISO 7267-1:2008(E) 2 ISO 2008 All rights reserved4 Conditioning and temperature of test Whenever possible, the test shall be carried out at a standar
25、d laboratory temperature in accordance with ISO 23529. The product under test shall, if possible, be maintained under the test conditions for sufficient time to reach temperature equilibrium with the test environment. Where this is impracticable, the period of time and the conditions shall be as giv
26、en in the product specification (see Note). The same temperature shall be used throughout any one test or series of tests intended to be comparable. NOTE For large rollers having heavy, metal cores, ambient conditions may not allow equilibrium temperatures to be obtained. 5 Apparatus 5.1 Rollers hav
27、ing a radius greater than 50 mm The apparatus used shall be that described in ISO 48:2007, method CN, CH or CL, as appropriate to the nominal apparent hardness of the roller cover to be tested. The base of the instrument shall have a hole below the plunger allowing free passage of the annular foot s
28、uch that measurement may be made above or below the base. The lower surface of the base shall be in the form of two cylinders parallel to each other and the plane of the base. The diameter of the cylinders and their distance apart shall be such as to locate and support the instrument on the curved s
29、urface to be tested (see Figure 1). Alternatively, the base may be fitted with feet movable in universal joints so that they adapt themselves to the curved surface. 5.2 Rollers having a radius of 4 mm to 50 mm The apparatus used shall be that described in ISO 48:2007, method CN, CH or CL, as appropr
30、iate to the nominal apparent hardness of the roller cover to be tested. On surfaces too small to support the instrument, jigs or V-blocks shall be provided to support the journals or shafts of the rollers so that the indentor is vertically above the axis of the roller under test (see Figure 2). Wax
31、may be used to support smaller rollers. 5.3 Small rollers having a radius less than 4 mm The apparatus used shall be that described in ISO 48:2007, method CM. Jigs or blocks shall be provided to support the roller so that the indentor is vertically above the axis of the roller under test. Alternativ
32、ely, the roller shall be secured by wax to the instrument table. No test shall be made if the radius is less than 0,8 mm. 6 Procedure 6.1 Firmly locate the roller to be tested with its major axis horizontal and with the area in which the hardness is to be measured uppermost. Place the measuring equi
33、pment, with the plunger vertical, on the roller over the position where the hardness is to be measured and lower the foot into contact with the roller surface. Bring the plunger and the indenting ball into contact with the rubber under the contact force. After 5 s, if the gauge is graduated in Inter
34、national Rubber Hardness Degrees (IRHD), adjust the gauge to read 100 and apply the additional major indenting force. Maintain this force for 30 s and then take the gauge reading as the hardness in IRHD. ISO 7267-1:2008(E) ISO 2008 All rights reserved 3If the gauge is graduated in metric units, note
35、 the differential indentation D (in hundredths of a millimetre) of the plunger caused by the additional indenting force, applied for 30 s. Convert this into International Rubber Hardness Degrees as described in ISO 48. During the loading periods, gently vibrate the apparatus unless it is completely
36、free of friction. Figure 1 Testing surfaces of large radius (R 50 mm) Figure 2 Test jig for surfaces of small radius (4 mm u R u 50 mm) 6.2 Make three measurements at different points at least 6 mm apart within the test area in which the hardness is to be determined. NOTE Several test areas along th
37、e length and around the circumference of the roller may be required to determine the average hardness of the covering and the hardness variation over a single roller (see ISO 6123-1, Rubber or plastics covered rollers Specifications Part 1: Requirements for hardness). 7 Expression of results Express
38、 the apparent hardness as the median of the three measurements for each test area, reported in IRHD to the nearest whole number. ISO 7267-1:2008(E) 4 ISO 2008 All rights reserved8 Test report The test report shall include the following information: a) a full description of the roller and its origin;
39、 b) a full reference to the test method used, i.e. the number of this part of ISO 7267; c) test details: 1) the time and temperature of conditioning prior to testing, 2) the temperature of test, and the relative humidity, if necessary, 3) details of any procedures not specified in this part of ISO 7267; d) test results: 1) the number of areas or rollers tested, 2) the individual test results, 3) the apparent hardness, expressed in IRHD (see Clause 7); e) the date of the test. ISO 7267-1:2008(E) ICS 83.140.99 Price based on 4 pages ISO 2008 All rights reserved
