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1、INTERNATIONAL STANDARD IS0 294-2 First edition AMENDMENT 1 1996-1 2-1 5 2004-05-1 5 Plastics - Injection moulding of test specimens of thermoplastic materials - Part 2: Small tensile bars AMENDMENT 1 Plastiques - Moulage par injection des prouvettes de matriaux thermoplastiques - Partie 2 : Barreaux
2、 de traction de petites dimensions AMENDEMENT 1 Reference number IS0 294-2:1996/Amd.l:2004(E) IS0 2004 IS0 294-2:1996/Amd.l:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unle
3、ss the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The IS0 Central Secretariat accepts no liability in this area. Adobe is a trademark
4、 of Adobe Systems Incorporated. Details of the sofiware products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IS0 member bodies. In
5、 the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. O IS02004 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, in
6、cluding photocopying and microfilm, without permission in writing from either IS0 at the address below or ISOs member body in the country of the requester. IS0 copyright office Case postale 56 CH-I211 Geneva 20 Tel. + 41 22 749 O 1 11 Fax +41 227490947 E-mail copyrightiso.org Web www.iso.org Publish
7、ed in Switzerland ii O IS0 2004 -All rights reserved -,-,- IS0 294-2:1996/Amd.l:2004(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out
8、through IS0 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. IS0 coll
9、aborates closely with the International Electrotechnical Commission (i EC) 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 S
10、tandards. 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
11、 of this document may be the subject of patent rights. IS0 shall not be held responsible for identifying any or all such patent rights. Amendment 1 to IS0 294-2:1996 was prepared by Technical Committee ISOTC 61, Plastics, Subcommittee SC 9, Thermoplastic materials. O IS0 2004 -All rights reserved ii
12、i -,-,- IS0 294-2:1996/Amd.l:2004(E) Plastics - Injection moulding of test specimens of thermoplastic materials - Part 2: Small tensile bars AMENDMENT 1 Page 1, Clause 2 Insert 1999 as the year of publication of IS0 11403-3 and delete the footnote. Note that, at the time of publication of this amend
13、ment, IS0 8256:1990 was under revision. The revised edition was expected to be published during the course of 2004. Page 2 , Subclause 4.1 At the end of the Subclause, add the following: “h) Ejector pins, if used, shall be located outside the test area of the specimen, .e. at the shoulders of the du
14、mbbell specimens.” O IS0 2004 -All rights reserved 1 IS0 294-2:1996/Amd.l:2004(E) ICs 83.080.20 Price based on 1 page O IS0 2004 -All rights reserved - STD-IS0 29Li-Z-ENGL L77b Li851903 Ob92Li8L b57 1 NT E R NAT I O N AL STANDARD IS0 294-2 First edition 1996-1 2-1 5 Plastics - Injection moulding of
15、test specimens of thermoplastic materials - Part 2: Small tensile bars Plastiques - Moulage par injection des prouvettes de matriaux thermoplastiques - Partie 2: Barreaux de traction de petites dimensions This material is reproduced from IS0 documents under International Organization for Standardiza
16、tion (BO) Copyright License number IHSllCCl1996. Not for resale. No part of these IS0 documents may be reproduced in any form, electronic retrieval system or otherwise, except as allowed in the copyright law of the country of use, or with the prior written consent of IS0 (Case postale 56,1211 Geneva
17、 20, Switzerland, Fax +41 22 734 10 79), IHS or the IS0 Licensos members. Reference number IS0 294-2:19961E) STD-IS0 274-2-ENGL 199b 4851903 Ob724B2 595 IS0 294-2:1996(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 mem
18、ber bodies). The work of preparing International Standards is normally carried out through IS0 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, governmen
19、tal and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft international Standards adopted by the technical committees are circulated to the mem
20、ber bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 294-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9, Thermoplastic materials. Together with the other parts,
21、 this part of IS0 294 cancels and replaces the second edition of IS0 294 (IS0 294:1995) which has been revised to improve the definition of the injection-moulding parameters and has been restructured to specify four types of IS0 mould for the production of the basic specimen types required for the a
22、cquisition of comparable test data. Care has been taken to ensure that the IS0 moulds described can all be fitted in existing injection-moulding equipment and have interchangeable cavity plates. IS0 294 consists of the following parts, under the general title Plastics - Injection moulding of test sp
23、ecimens of thermoplastic materials: - Part 1: General principles. and moulding of multipurpose and bar test specimens Part 2: Small tensile bars - - Part 3: Small plates - Part 4: Determination of moulding shrinkage o IS01996 All rights reserved. Unless otherwise specified, no part of this publicati
24、on may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 CH-1 21 1 Genve 20 Switzerland Printed in Switzerland II STD*
25、ISO 27Li-2-ENGL 177b Li851703 Ob72Li83 921 INTERNATIONAL STANDARD 0 IS0 IS0 294-2:1996(E) Plastics - Injection moulding of test specimens of thermoplastic materials - Part 2: Small tensile bars 1 Scope This part of IS0 294 specifies a four-cavity mould, the type C IS0 mould, for the injection mouldi
26、ng of small tensile bars measuring s 60 mm x 1 O mm x 3 mm (the type 4 test specimen in IS0 8256:1990). 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 294. At the time of publication, the editions ind
27、icated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 294 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid Internat
28、ional Standards. IS0 294-1 :I 996, Plastics - Injection moulding of test specimens of thermoplastic materials - Part 7: General principles, and moulding of multipurpose and bar test specimens. IS0 8256: 1990, Plastics - Determination of tensile-impact strength. IS0 1 1403-3:-1), Plastics - Acquisiti
29、on and presentation of comparable multipoint data - Part 3: Environmental influences on properties. 3 Definitions See IS0 294-1 :I 996, clause 3. 1) To be published. 1 -,-,- IS0 294-2:1996(E) Q IS0 4 Apparatus 4.1 Type C IS0 mould The type C IS0 mould is a four-cavity mould with a double-T runner (s
30、ee figure 1) intended for the preparation of small tensile bars to be used for the measurement of so-called “indicative“ properties when studying the effects of environmental influences, such as liquid chemicals, heat or weathering, on plastics (see IS0 11403-3). The bar mouldings produced using thi
31、s mould shall have the dimensions of the type 4 specimen defined in IS0 8256:1990 plus a thickness of 3,O mm I0,2 mm. x-Y G x - Dimensions in millimetres G I G Key I I G Y - Sp Sprue Moulding volume V, = 24 O00 mm3 G Gate Projected area Ap = 5 500 mm* Figure 1 - Cavity plate for a type C IS0 mould T
32、he main constructional details of the type C IS0 mould shall be as shown in figure 1 and shall meet the requirements given in IS0 294-1 :1996, subclause 4.1.1.4. items a) to n), with the following exception: g) The dimensions of the test specimens refer to IS0 8256, .e. the main dimensions, in milli
33、metres, of the cavities shall be as follows: - width of central section: 3,O to 3,l; - radius of curvature: 15 to 16. The thickness of the test specimens shall be 3,O mm f 0,2 mm, .e. the depth of the cavities shall be 3,O mm to 3.2 mm. 4.2 Injection-moulding machine See IS0 294-1 :1996, subclause 4
34、.2, with the following exception: In subclause4.2.4, the recommended minimum locking force FM for the type C IS0 mould is given by FM 3 5 500 xpmax x 10-3, .e. 440 kN for a maximum melt pressure of 80 MPa. 2 -,-,- STD-IS0 274-2-ENGL L77b 4851903 Ob72485 2T4 0 IS0 IS0 294-2:1996(E) 5 Procedure 5.1 Co
35、nditioning of material See IS0 294-1:1996, subclause 5.1 5.2 Injection moulding See IS0 294-1 :1996, subclause 5.2, but with the following new text for subclause 5.2.2. For the type C IS0 mould, it is recommended that the injection velocity V I be chosen such that the injection time t, is comparable
36、 to that used for the type A IS0 mould. NOTES 1 The cavities in the type C IS0 mould have a low critical cross-sectional area Ac of only 9 mm2, .e. much lower than that for the type A IS0 mould (40 mm2). If the same injection speed vI were used for the type C mould as for the type A mould, this woul
37、d result in a low screw advance speed and hence a low melt speed in the runners and a low melt temperature before the melt enters the cavities of the type C mould. Using the recommended common injection time tl, however, the injection velocity vI for the type C mould is about twice that recommended
38、for the type A mould see IS0 294-1 :1996, equation (311. 2 This part of IS0 294 does not address the question of changes in screw advance speed, e.g. high speeds when filling the runners and low speeds when filling the cavities. As a result of the inertia of the injection-moulding machine, peaks in
39、melt pressure and/or injection speed often cannot be avoided if the screw advance speed is changed during injection. 6 Report on test-specimen preparation The report shall include the following information: a) a reference to this part of IS0 294; b) to h): see IS0 294-1 :1996, clause 6, items b) to h). 3 -,-,- IS0 294-2:1996(E) ICs 83.080.20 Descriptors: plastics. thermoplastic resins, injection moulding, moulding materials, test specimens, bars (materials), specimen preparation. reference data Price based on 3 pages