BS ISO 1268-10-2005 Fibre-reinforced plastics - Methods of producing test plates - Injection moulding of BMC and other long-fibre compounds - General principles and moulding of mul.pdf

1、BRITISH STANDARD BS ISO 1268-10:2005 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 specimens ICS 83.120 BS ISO 1268-10:2005 This British Standard was published

2、 under the authority of the Standards Policy and Strategy Committee on 16 February 2005 BSI 16 February 2005 ISBN 0 580 45477 0 National foreword This British Standard reproduces verbatim ISO 1268-10:2005 and implements it as the UK national standard. The UK participation in its preparation was entr

3、usted to Technical Committee PRI/42, Fibre reinforced thermosetting plastics and prepregs, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publicat

4、ions referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necess

5、ary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interp

6、retation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 16,

7、 an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 1268-10:2005(E)INTERNATIONAL ADNATSDR ISO 1-86201 tide tsriFino -500210-20Fibre-rei

8、nforced 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 specimens Plastiques renforcs de fibres Mthodes de fabrication de plaques dessai Partie 10: Moulage par injection de BMC e

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11、 mutlpisel BSISO126810:2005 ii BSISO126810:2005 iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 2 4 Apparatus. 7 5 Procedure. 10 6 Report on test-specimen preparation . 11 Annex A (informative) Examples of runner configurations 12 Annex B (in

12、formative) Marking of test specimens 13 Annex C (informative) Example of an injection mould . 14 Bibliography . 16 BSISO126810:2005iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing In

13、ternational 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 committee. International organizations, governmental and non-governmental, in liaison

14、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 accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of techn

15、ical 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 requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn

16、 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 1268-10 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites and reinforcement f

17、ibres. Together with the other parts (see below), this part of ISO 1268 cancels and replaces ISO 1268:1974, which has been technically revised. ISO 1268 consists of the following parts, under the general title Fibre-reinforced plastics Methods of producing test plates: Part 1: General conditions Par

18、t 2: Contact and spray-up moulding Part 3: Wet compression moulding Part 4: Moulding of prepregs Part 5: Filament winding Part 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 l

19、ong-fibre moulding compounds General principles and moulding of multipurpose test specimens Part 11: Injection moulding of BMC and other long-fibre moulding compounds Small plates BSISO126810:2005 vIntroduction Many factors in the injection-moulding process can influence the properties of moulded te

20、st specimens and hence the measured values obtained when the specimens are used in a 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 param

21、eters of the moulding process is a basic requirement for reproducible and comparable 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 o

22、f anisotropic fillers such as long fibres and in curing. Residual (“frozen-in”) stresses 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 thes

23、e phenomena must be controlled to avoid fluctuation of the numerical values of the measured 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 r

24、einforcements. It is therefore possible to compare the properties of long-fibre moulding compounds with those of thermosetting powder moulding compounds (PMCs) and thermoplastics. BSISO126810:2005blankINTENRATIONAL TSANDADR IS-8621 O01:(5002E)1Fibre-reinforced plastics Methods of producing test plat

25、es Part 10: Injection moulding of BMC and other long-fibre moulding 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

26、 details of mould designs for preparing one type of specimen for 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 ma

27、in parameters of the moulding process and also to establish uniform 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

28、International Standard for the relevant material or are to be agreed 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 Norma

29、tive 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 amendments) applies. ISO 472, Plastics Vocabulary ISO

30、1268-1, Fibre-reinforced plastics Methods of producing test plates 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 mate

31、rials Determination of shrinkage ISO 3167, Plastics Multipurpose 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 compo

32、unds (PMCs) Part 1: General principles and moulding of multipurpose test specimens ISO 10724-2, Plastics Injection moulding of test specimens of thermosetting powder moulding compounds (PMCs) Part 2: Small plates BSISO126810:20052 ISO 11403-1, Plastics Acquisition and presentation of comparable mult

33、ipoint data Part 1: Mechanical 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

34、 and definitions For the purposes of this document, the terms and definitions given in ISO 472 and the following apply. 3.1 mould temperature T Caverage temperature of the mould cavity surfaces measured after the system has attained thermal equilibrium and immediately after opening the mould NOTE It

35、 is expressed in degrees Celsius (C). 3.2 temperature of material T Mtemperature 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 m

36、aterial in front of the 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 F sacting longitudinally on the screw using Equation (1): 3 s 2 41

37、 0 F p D = (1) where p is the pressure on the material, in megapascals (MPa); F sis 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 p maxmaximum value of the pressure on the material NOTE It is expre

38、ssed in megapascals (MPa). BSISO126810:2005 33.5 hold pressure p Hpressure 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 test specimen

39、s (see Figure 1) NOTE It is expressed in seconds (s). 3.7 cycle time t Ttime 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 t I , the cure time t CRand the mould open time t O . Key 1 pressure on material,

40、 p 2 longitudinal position of the screw 3 injection time, t I4 hold time, t H 5 cure time, t CR 6 cycle time, t T7 open time, t O 8 mould opening 9 mould closing 10 hold pressure, p H11 time Figure 1 Schematic diagram of an injection-moulding cycle, showing the pressure on the material (full line) a

41、nd the longitudinal position of the screw (dashed line) as a function of time BSISO126810:20054 3.8 injection time t Itime from the instant the screw starts to move forward until the switchover point between the injection period and the hold period NOTE It is expressed in seconds (s). 3.9 cure time

42、t CRtime from the end of the injection period until the mould starts to open NOTE It is expressed in seconds (s). 3.10 hold time t Htime from the end of the injection period until the hold pressure p His released NOTE It is expressed in seconds (s). 3.11 mould-open time t Otime from the instant the

43、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 one specimen 3.13 two-cavity mould mould tha

44、t 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 properties. BSISO126810:2005 5Dimensions in millimet

45、res Key 1 preferably 82 mm Sp sprue G gate P pressure sensor (optional) shot capacity V S= 30 000 mm 3projected area A p= 6 500 mm 2Figure 2 Two-cavity plate for a type A ISO mould BSISO126810:20056 3.14 ISO mould any one of the standard moulds (designated type A, D1 and D2) intended for the reprodu

46、cible 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 details 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

47、 A Ccross-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 moulded NOTE 1 It is expressed in square millimetres (mm 2 ). NOTE 2 For tensile bar test specimens, the critical portion o

48、f the test specimen is the narrow section that is subjected to the greatest stress during testing. 3.16 moulding volume V Mratio of the mass of the moulding to the density of the solid plastic NOTE It is expressed in cubic millimetres (mm 3 ). 3.17 projected area A poverall profile of the moulding p

49、rojected onto the parting plane NOTE It is expressed in square millimetres (mm 2 ). 3.18 locking force F Mforce holding the cavity plates of the mould closed NOTE 1 It is expressed in kilonewtons (kN). NOTE 2 The minimum locking force necessary may be calculated from the inequality: 3 Mpm a x 10 FAp W (2) where F Mis the locking force, in k