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1、 Reference number ISO 1268-10:2005(E) ISO 2005 INTERNATIONAL STANDARD ISO 1268-10 First edition 2005-02-01 Fibre-reinforced plastics Methods of producing test plates Part 10: Injection moulding of BMC and other long-fibre moulding compounds General principles and moulding of multipurpose test specim
2、ens Plastiques renforcs de fibres Mthodes de fabrication de plaques dessai Partie 10: Moulage par injection de BMC et dautres mlanges mouler longues fibres Principes gnraux et moulage dprouvettes usages multiples ISO 1268-10:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In acc
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5、nting. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2005 All rights reserved. Unless otherwise specified, no part of this
6、 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 country of the requester. ISO copyright office Case postale 56 CH-1211
7、 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 2005 All rights reserved ISO 1268-10:2005(E) ISO 2005 All rights reserved iii Contents Page Forewordiv Introduction v 1 Scope1 2 Normative references .1 3 Terms and definit
8、ions.2 4 Apparatus.7 5 Procedure.10 6 Report on test-specimen preparation.11 Annex A (informative) Examples of runner configurations12 Annex B (informative) Marking of test specimens13 Annex C (informative) Example of an injection mould .14 Bibliography .16 ISO 1268-10:2005(E) iv ISO 2005 All rights
9、 reserved Foreword ISO (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 committees. Each member body interested in a subject for
10、 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 the International Electrotechnical Commission (IEC) on a
11、ll 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 International Standards adopted by the technical committees are
12、 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 the subject of patent rights. ISO shall not be held re
13、sponsible for identifying any or all such patent rights. ISO 1268-10 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites and reinforcement fibres. Together with the other parts (see below), this part of ISO 1268 cancels and replaces ISO 1268:1974, which has been t
14、echnically revised. ISO 1268 consists of the following parts, under the general title Fibre-reinforced plastics Methods of producing test plates: Part 1: General conditions Part 2: Contact and spray-up moulding Part 3: Wet compression moulding Part 4: Moulding of prepregs Part 5: Filament winding Pa
15、rt 6: Pultrusion moulding Part 7: Resin transfer moulding Part 8: Compression moulding of SMC and BMC Part 9: Moulding of GMT/STC Part 10: Injection moulding of BMC and other long-fibre moulding compounds General principles and moulding of multipurpose test specimens Part 11: Injection moulding of B
16、MC and other long-fibre moulding compounds Small plates -,-,- ISO 1268-10:2005(E) ISO 2005 All rights reserved v Introduction Many factors in the injection-moulding process can influence the properties of moulded test specimens and hence the measured values obtained when the specimens are used in a
17、test method. The thermal and mechanical properties of such specimens are in fact strongly dependent on the conditions of the moulding process used to prepare the specimens. Exact definition of each of the main parameters of the moulding process is a basic requirement for reproducible and comparable
18、operating conditions. It is important in defining moulding conditions to consider any influence the conditions may have on the properties to be determined. Thermosets may show differences in orientation and length of anisotropic fillers such as long fibres and in curing. Residual (“frozen-in”) stres
19、ses in the moulded test specimens may also influence properties. Due to the crosslinking of thermosets, molecular orientation is of less influence on mechanical properties than it is for thermoplastics. Each of these phenomena must be controlled to avoid fluctuation of the numerical values of the me
20、asured properties. The principles described in this part of ISO 1268 are the same as those in ISO 10724-1. Only a few details of the moulds have changed, as has specimen thickness, because of the use of long-fibre reinforcements. It is therefore possible to compare the properties of long-fibre mould
21、ing compounds with those of thermosetting powder moulding compounds (PMCs) and thermoplastics. -,-,- -,-,- INTERNATIONAL STANDARD ISO 1268-10:2005(E) ISO 2005 All rights reserved 1 Fibre-reinforced plastics Methods of producing test plates Part 10: Injection moulding of BMC and other long-fibre moul
22、ding compounds General principles and moulding of multipurpose test specimens 1 Scope This part of ISO 1268 specifies the general principles to be followed while injection moulding test specimens of bulk moulding compound (BMC) and gives details of mould designs for preparing one type of specimen fo
23、r use in establishing reproducible moulding conditions. Where appropriate, this part of ISO 1268 may be applied to sheet moulding compound (SMC) formulated for injection moulding. Its purpose is to promote uniformity in describing the main parameters of the moulding process and also to establish uni
24、form practice in reporting moulding conditions. The particular conditions required for the reproducible preparation of test specimens which will give comparable results will vary for each material used. These conditions are given in the International Standard for the relevant material or are to be a
25、greed upon between interested parties. NOTE Tests have shown that mould design in an important factor in the reproducible preparation of test specimens. This part of ISO 1268 is intended to be read in conjunction with ISO 1268-1. 2 Normative references The following referenced documents are indispen
26、sable 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 amendments) applies. ISO 472, Plastics Vocabulary ISO 1268-1, Fibre-reinforced plastics Methods of producing test pla
27、tes Part 1: General conditions ISO 1268-11, Fibre-reinforced plastics Methods of producing test plates Part 11: Injection moulding of BMC and other long-fibre moulding compounds Small plates ISO 2577, Plastics Thermosetting moulding materials Determination of shrinkage ISO 3167, Plastics Multipurpos
28、e test specimens ISO 10350-2, Plastics Acquisition and presentation of comparable single-point data Part 2: Long-fibre- reinforced plastics ISO 10724-1, Plastics Injection moulding of test specimens of thermosetting powder moulding compounds (PMCs) Part 1: General principles and moulding of multipur
29、pose test specimens ISO 10724-2, Plastics Injection moulding of test specimens of thermosetting powder moulding compounds (PMCs) Part 2: Small plates -,-,- ISO 1268-10:2005(E) 2 ISO 2005 All rights reserved ISO 11403-1, Plastics Acquisition and presentation of comparable multipoint data Part 1: Mech
30、anical properties ISO 11403-2, Plastics Acquisition and presentation of comparable multipoint data Part 2: Thermal and processing properties ISO 11403-3, Plastics Acquisition and presentation of comparable multipoint data Part 3: Environmental influences on properties 3 Terms and definitions For the
31、 purposes of this document, the terms and definitions given in ISO 472 and the following apply. 3.1 mould temperature TC average temperature of the mould cavity surfaces measured after the system has attained thermal equilibrium and immediately after opening the mould NOTE It is expressed in degrees
32、 Celsius (C). 3.2 temperature of material TM temperature of the plasticized material in a free shot NOTE 1 It is given by the temperature of the wall of the screw cylinder. NOTE 2 It is expressed in degrees Celsius (C). 3.3 pressure on material p pressure on the plasticized material in front of the
33、screw at any time during the moulding process (see Figure 1) NOTE 1 It is expressed in megapascals (MPa). NOTE 2 The pressure on the material, which is generated hydraulically, can be calculated from the force Fs acting longitudinally on the screw using Equation (1): 3 s 2 410F p D = (1) where p is
34、the pressure on the material, in megapascals (MPa); Fs is the longitudinal force, in kilonewtons (kN), acting on the screw; D is the screw diameter, in millimetres (mm). 3.4 maximum pressure on the material pmax maximum value of the pressure on the material NOTE It is expressed in megapascals (MPa).
35、 -,-,- ISO 1268-10:2005(E) ISO 2005 All rights reserved 3 3.5 hold pressure pH pressure on the material during the hold time (see Figure 1) NOTE It is expressed in megapascals (MPa). 3.6 moulding cycle complete sequence of operations in the moulding process required for the production of one set of
36、test specimens (see Figure 1) NOTE It is expressed in seconds (s). 3.7 cycle time tT time required to carry out a complete moulding cycle NOTE 1 It is expressed in seconds (s). NOTE 2 The cycle time is the sum of the injection time tI, the cure time tCR and the mould open time tO. Key 1 pressure on
37、material, p 2 longitudinal position of the screw 3 injection time, tI 4 hold time, tH 5 cure time, tCR 6 cycle time, tT 7 open time, tO 8 mould opening 9 mould closing 10 hold pressure, pH 11 time Figure 1 Schematic diagram of an injection-moulding cycle, showing the pressure on the material (full l
38、ine) and the longitudinal position of the screw (dashed line) as a function of time -,-,- ISO 1268-10:2005(E) 4 ISO 2005 All rights reserved 3.8 injection time tI time from the instant the screw starts to move forward until the switchover point between the injection period and the hold period NOTE I
39、t is expressed in seconds (s). 3.9 cure time tCR time from the end of the injection period until the mould starts to open NOTE It is expressed in seconds (s). 3.10 hold time tH time from the end of the injection period until the hold pressure pH is released NOTE It is expressed in seconds (s). 3.11
40、mould-open time tO time from the instant the mould starts to open until the mould is closed and exerts the full locking force NOTE It is expressed in seconds (s) and includes the time required to remove the mouldings from the mould. 3.12 cavity that part of the hollow space in a mould which produces
41、 one specimen 3.13 two-cavity mould mould that contains two identical cavities in a parallel-flow arrangement (see Figure 2) NOTE Identical flowpath geometries and symmetrical positioning of the cavities in the cavity plate ensure that all test specimens from one shot are equivalent in their propert
42、ies. -,-,- ISO 1268-10:2005(E) ISO 2005 All rights reserved 5 Dimensions in millimetres Key 1 preferably 82 mm Sp sprue G gate P pressure sensor (optional) shot capacity VS = 30 000 mm3 projected area Ap = 6 500 mm2 Figure 2 Two-cavity plate for a type A ISO mould ISO 1268-10:2005(E) 6 ISO 2005 All
43、rights reserved 3.14 ISO mould any one of the standard moulds (designated type A, D1 and D2) intended for the reproducible preparation of test specimens with comparable properties NOTE 1 The moulds have a fixed plate with a central sprue, plus a two-cavity plate as described in 3.13. Additional deta
44、ils are given in 4.1.4. NOTE 2 An example of a complete mould is shown in Annex C. 3.15 critical cross-sectional area AC cross-sectional area of the cavity of an ISO mould at the position where the critical portion of the test specimen, i.e. that part on which the measurement will be made, is moulde
45、d NOTE 1 It is expressed in square millimetres (mm2). NOTE 2 For tensile bar test specimens, the critical portion of the test specimen is the narrow section that is subjected to the greatest stress during testing. 3.16 moulding volume VM ratio of the mass of the moulding to the density of the solid
46、plastic NOTE It is expressed in cubic millimetres (mm3). 3.17 projected area Ap overall profile of the moulding projected onto the parting plane NOTE It is expressed in square millimetres (mm2). 3.18 locking force FM force holding the cavity plates of the mould closed NOTE 1 It is expressed in kilon
47、ewtons (kN). NOTE 2 The minimum locking force necessary may be calculated from the inequality: 3 Mpmax 10FAp W (2) where FM is the locking force, in kilonewtons (kN); Ap is the projected area, in square millimetres (mm2); pmax is the maximum value of the pressure on the material, in megapascals (MPa
48、). 3.19 injection velocity vI average velocity of the material as it passes through the critical cross-sectional area AC NOTE 1 It is expressed in millimetres per second (mm/s). ISO 1268-10:2005(E) ISO 2005 All rights reserved 7 NOTE 2 It is applicable to multi-cavity moulds only (in this case a two-cavity mould), and is calculated from Equation (3): M I IC 2 V v tA = (3) where vI is the injection velocity, in m