1、 DEUTSCHE NORMMay 2006DIN EN ISO 294-2 ICS 83.080.20 Supersedes DIN EN ISO 294-2:1998-10 Plastics Injection moulding of test specimens of thermoplastic materials Part 2: Small tensile bars (ISO 294-2:1996 + Amd.1:2004) English version of DIN EN ISO 294-2:2006-05 Kunststoffe Spritzgieen von Probekrpe
2、rn aus Thermoplasten Teil 2: Kleine Zugstbe (ISO 294-2:1996 + Amd.1:2004) Englische Fassung DIN EN ISO 294-2:2006-05 Document comprises 8 pages No part of this standard may be reproduced without prior permission of DIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Ger
3、many, has the exclusive right of sale for German Standards (DIN-Normen). English price group 7 www.din.de www.beuth.de !,nx“12.06 9759285DIN EN ISO 294-2:2006-05 2 National foreword This standard has been published in accordance with a decision taken by CEN/TC 249 to adopt, without alteration, Inter
4、national Standard ISO 294-2:1996 + Amd. 1:2004 as a European Standard. The responsible German body involved in its preparation was the Normenausschuss Kunststoffe (Plastics Standards Committee), Technical Committee FNK-AA 102.1 Mechanische Eigenschaften und Probekrper-herstellung. Amendment A1:2005
5、has been integrated in this standard and is marked by a vertical line in the left margin. The DIN Standards corresponding to the International Standards referred to in clause 2 of the EN are as follows: ISO 294-1 DIN EN ISO 294-1 ISO 8256 DIN EN ISO 8256 Amendments This standard differs from the Oct
6、ober 1998 edition as follows: a) In clause 2, the year of publication of ISO 11403-3 has been inserted and the footnote has been deleted. b) In subclause 4.1, item h) has been added. Previous editions DIN EN ISO 294-2: 1998-10 National Annex NA (informative) Bibliography DIN EN ISO 294-1, Plastics I
7、njection moulding of test specimens of thermoplastic materials Part 1: General principles, and moulding of multipurpose and bar test specimens DIN EN ISO 8256, Plastics Determination of tensile-impact strength EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 294-2 July 1998 +A1 August 2005 I
8、CS 83.080.01 Supersedes EN ISO 294-2:1998.English version Plastics Injection moulding of test specimens of thermoplastic materials Part 2: Small tensile bars (ISO 294-2:1996 + Amd. 1:2004) Plastiques Moulage par injection des prouvettes de matriaux thermoplastiques Partie 2: Barreaux de traction de
9、petites dimensions (ISO 294-2:1996 + Amd. 1:2004) Kunststoffe Spritzgieen von Probekrpern aus Thermoplasten Teil 2: Kleine Zugstbe (ISO 294-2:1996 + Amd. 1:2004) EN ISO 294-2 was approved by CEN on 1998-06-12 and Amendment A1 on 2005-08-08. CEN members are bound to comply with the CEN/CENELEC Intern
10、al Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. T
11、he European Standards exist in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the
12、 national standards bodies of Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland, and the U
13、nited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 294-2:19
14、98 + A1:2005 EEN ISO 294-2:1998 + A1:2005 (E) 2 Contents Page Foreword to EN ISO 294-2:1998 2 Foreword to EN ISO 294-2:1998/A1:20053 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Apparatus .4 4.1 Type C ISO mould4 4.2 Injection-moulding machine .5 5 Procedure .5 5.1 Conditioning of material .
15、5 5.2 Injection moulding.5 6 Report on test-specimen preparation5 Annex ZA (informative) Normative references to international publications with their corresponding European publications 6 Foreword to EN ISO 294-2:1998 International Standard ISO 294-2:1998 Plastics Injection moulding of test specime
16、ns of thermoplastic materials Part 2: Small tensile bars, which was prepared by ISO/TC 61 Plastics of the International Organization for Standardization, has been adopted by Technical Committee CEN/TC 249 Plastics, the Secretariat of which is held by IBN, as a European Standard. This European Standa
17、rd shall be given the status of a national standard, either by publication of an identical text or by endorsement, and conflicting national standards withdrawn, by January 1999 at the latest. In accordance with the CEN/CENELEC Internal Regulations, the national standards organizations of the followi
18、ng countries are bound to implement this European Standard: Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. Endorsement notice The text of the
19、International Standard ISO 294-2:1996 was approved by CEN as a European Standard without any modification. NOTE: Normative references to international publications are listed in Annex ZA (normative). 3 Foreword to EN ISO 294-2:1998/A1:2005 The text of ISO 294-2:1996/Amd. 1:2004 has been prepared by
20、Technical Committee ISO/TC 61 “Plastics” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 294-2:1998/A1:2005 by Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by IBN. This European Standard shall be given the status of a natio
21、nal standard, either by publication of an identical text or by endorsement, at the latest by February 2006, and conflicting national standards shall be withdrawn at the latest by February 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following c
22、ountries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Swit
23、zerland and United Kingdom. Endorsement notice The text of ISO 294-2:1996/Amd. 1:2004 has been approved by CEN as EN ISO 294-2:1998/A1:2005 without any modifications. 1 Scope This part of IS0 294 specifies a four-cavity mould, the type C IS0 mould, for the injection moulding of small tensile bars me
24、asuring 60 mm x 10 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 indicated were valid. All standar
25、ds 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 International Standards. I SO 294-l :
26、1996, P/as tics - 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. 3 Definitions See IS0 294-l :I 996, clause 3. influences on proper
27、ties.ISO 11403-3:1999, Plastics Acquisition and presentation of comparable multipoint data Part 3: EnvironmentalEN ISO 294-2:1998 + A1:2005 (E)IS0 294-2: 1996(E) 4 Apparatus 4.1 Type C IS0 mould The type C IS0 mould is a four-cavity mould with a double-T runner (see figure I) intended for the prepar
28、ation 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 this mould shall have the dimensions of
29、 the type 4 specimen defined in IS0 8256:1990 plus a thickness of 3,0 mm Ifr 0,2 mm. X-Y Dimensions in millimetres X I- G I G I I I I -T G c G Y w SP Sprue Moulding volume VM = 24 000 mm3 G Gate Projected area AP = 5 500 mm* Figure 1 - Cavity plate for a type C IS0 mould The main constructional deta
30、ils of the type C IS0 mould shall be as shown in figure 1 and shall meet the requirements given in IS0 294-l :I 996, subclause 4.1 .I .4, items a) to n), with the following exception: g) The dimensions of the test specimens refer to IS0 8256, i.e. the main dimensions, in millimetres, of the cavities
31、 shall be as follows: - width of central section: 3,0 to 3,l; - radius of curvature: 15 to 16. The thickness of the test specimens shall be 3,0 mm * 0,2 mm, i.e. the depth of the cavities shall be 3,0 mm to 3,2 mm. EN ISO 294-2:1998 + A1:2005 (E) 4dumbbell specimens. h) Ejector pins, if used, shall
32、be located outside the test area of the specimen, i.e. at the shoulders of the 5 Procedure 5.1 Conditioning of material See IS0 294-l : 1996, subclause 5.1. 5.2 Injection moulding See IS0 294-l :I 996, subclause 5.2, but with the following new text for subclause 5.2.2. For the type C IS0 mould, it i
33、s recommended that the injection velocity vr be chosen such that the injection time tl is comparable to that used for the type A IS0 mould. NOTES 1 The cavities in the type C lS0 mould have a low critical cross-sectional area AC of only 9 mm*1 i.e. much lower than that for the type A IS0 mould (40 m
34、m*). If the same injection speed vI were used for the type C mould as for the type A mould, this would 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 inject
35、ion time tl, however, the injection velocity vI for the type C mould is about twice that recommended for the type A mould see IS0 294-1 :I 996, equation (3). 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 spee
36、ds when filling the cavities. As a result of the inertia of the injection-moulding machine, peaks in melt pressure and/or injection speed often cannot be avoided if the screw advance speed is changed during injection. 4.2 Injection-moulding machine See IS0 294-l :I 996, subclause 4.2, with the follo
37、wing exception: In subclause 4.2.4, the recommended minimum locking force FM for the type C IS0 mould is given by FM a 5500xp,a, x IO-s, i.e. 440 kN for a maximum melt pressure of 80 MPa. 6 Report on test-specimen preparation The report shall include the following information: a) a reference to this
38、 part of IS0 294; b) to h): see IS0 294-l :I 996, clause 6, items b) to h). 5EN ISO 294-2:1998 + A1:2005 (E)EN ISO 294-2:1998 + A1:2005 (E) 6 Annex ZA (informative) Normative references to international publications with their corresponding European publications This European Standard incorporates,
39、by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this s
40、tandard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies (including amendments). NOTE: Where an International Publication has been modified by common modifications, indicated by (mod.), the relevant EN/HD applies
41、. Publication Year Title EN/HD Year ISO 294-1 1996 Plastics Injection moulding of test specimens of thermoplastic materials Part 1: General principles, and moulding of multipurpose and bar test specimens EN ISO 294-1 1998 ISO 8256 1990 Plastics Determination of tensile-impact strength (including Technical Corrigendum 1:1991) EN ISO 8256 1998
