1、BRITISH STANDARD BS ISO 17771:2003 Plastics Thermoset moulding compounds Determination of the degree of fibre wetting in SMC ICS 83.120 BS ISO 17771:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 8 August 2003 BSI 8 August 2003 ISBN 0 5
2、80 42429 4 National foreword This British Standard reproduces verbatim ISO 17771:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee PRI/42, Fibre reinforced thermosetting plastics and prepregs, which has the responsibility
3、 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 publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards
4、 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 necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard doe
5、s 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 interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European devel
6、opments 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 iv, pages 1 to 4, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issu
7、ed. Amendments issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD ISO 17771 First edition 2003-07-15 Reference number ISO 17771:2003(E) OSI 2003 Plastics Thermoset moulding compounds Determination of the degree of fibre wetting in SMC Plastiques Compositions de moulages base de th
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13、g BSISO17771:2003ISO 77713002:1)E( ISO 3002 r llAithgs reservde iii 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 technica
14、l 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. ISO collaborates closely wit
15、h 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 3. Draft International Standards adopted by the technical committees are circulated to the
16、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 International Standard may be the subject of patent rights. ISO shall not be held respons
17、ible for identifying any or all such patent rights. International Standard ISO 17771 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites and reinforcement fibres. It is technically identical to EN 12575:1998. BSISO17771:2003ISO :17771(3002)E iv ISO 3002 Ar llithgr
18、 seresvde Introduction This method provides a common basis for reinforcement manufacturers, compounders and moulders to compare data and monitor the consistency of wetting of the fibre. As wetting of fibre often improves during the first , samples of the same age are used for comparison purposes. In
19、 a production situation, the process and formulation parameters are assumed to be constant and sufficient to produce a standard visual level of wetting. Any drifts in paste viscosity, reinforcement fibre content, mass per unit area, degree of compaction, etc., which adversely affect wetting can thus
20、 be identified. In a development situation, the compounding process conditions need to be such that they give an acceptable level of wetting of the reinforcement. New formulations or new reinforcements can be screened using a control under identical process conditions. This screening is carried out
21、after compounding, allowing the products under evaluation to be judged superior or inferior to the control. 24 h BSISO17771:2003ANRETNIITOTS LANDNADRA ISO 77713002:1)E( ISO 3002 r llAithgs reservde 1 Plastics Thermoset moulding compounds Determination of the degree of fibre wetting in SMC 1 Scope Th
22、is International Standard specifies a method for determining the degree of wetting of the reinforcement in a sheet moulding compound (SMC). It is applicable to quality control by the user of the SMC, as well as to process control during SMC production. 2 Normative references The following normative
23、documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are e
24、ncouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. IS
25、O 472, Plastics Vocabulary ISO 8604, Plastics Prepregs Definitions of terms and symbols for designations 3 Terms and definitions For the purposes of this International Standard, the terms and definitions given in ISO 472 and ISO 8604 and the following apply. 3.1 fibre bundle discrete collection of m
26、any parallel fibre filaments, chopped or unchopped 3.2 wetting state in which all the reinforcing bundles in an SMC sheet, not necessarily each individual filament, are wetted by the paste 4 Sampling From each item to be checked (a single roll or sheet of SMC), take a laboratory sample consisting of
27、 a strip at leastwide extending cross the entire width of the SMC sheet. 5A p p a r a t u s 5.1 Ruler (solvent-resistant). 5.2 Sampling table (measuring approximately ). 5.3 Solvent-resistant opaque plate, with a inspection window (viewing field) at its centre. 40 cm 100 cm 180 cm 10 cm 10 cm BSISO1
28、7771:2003ISO :17771(3002)E 2 ISO 3002 Ar llithgr seresvde 5.4 Solvent-resistant gloves. 5.5 Magnifying glass (magnification ). 5.6 Disposable spatula (such as a tongue depressor) or disposable blade. 6 Procedure 6.1 The test is normally carried out immediately after manufacture of the SMC, although
29、it can be used as a quality control test at any specified time after manufacture. 6.2 Remove the upper protective film from the sample. With sheets thick or more, use the spatula or disposable blade to split the sheet across its entire width at three different levels (see Figure 1). This exposes a c
30、ross-section of the sheet in which the fibres at the top, middle and bottom of the sheet can be observed at the same time. With SMC sheets less than thick, tear the sample across its entire width. It will always tear at an angle. Because of this angle, a cross-section appears across the sheet, enabl
31、ing the degree of fibre wetting to be assessed visually. If the degree of wetting is , it is not necessary to continue the assessment using the inspection window. 6.3 If there are dry spots, take a new sample and split it across its entire width at the level containing the most dry areas. Divide the
32、 sample into four identical strips of length perpendicular to the machine direction (see Figure 2) and choose the strip which contains the largest dry spots. Dimensions in centimetres Key 1 Width of roll or sheet 2 Machine direction 3T o p 4M i d d l e 5 Bottom 6 Line along which sheet is split Figu
33、re 1 Splitting an SMC sheet 10 10 mm 10 mm 100 % 10 cm BSISO17771:2003ISO 77713002:1)E( ISO 3002 r llAithgs reservde 3 6.4 Inspect the strip by moving the inspection window from left to right in steps. In each square (viewing field), use the ruler to measure the dimensions of the dry spots, determin
34、e their surface area in square centimetres and record the results. Add these areas to give the dry-spot area for each viewing field. NOTE 1 The use of a magnifying glass is recommended when necessary, especially in the case of light colours, high filler contents and low-solubility sizing in the rein
35、forcement fibres. NOTE 2 Pressing down on the SMC with any object (hands, spatula, knife, elbow, etc.) is likely to displace paste off the fibres and cause a defect. NOTE 3 Should any particular area parallel to the machine direction exhibit a repeating defect, the determination of the cause of the
36、defect (e.g. wrinkles in the film or partial blockage of the doctor blade) will enable it to be corrected. 7 Expression of results Calculate the degree of wetting of the fibre from the equation: where is the degree of wetting, in per cent; is the total dry-spot area in a particular viewing field, in
37、 square centimetres; is the number of viewing fields; is the area of the viewing field (inspection window), in square centimetres. 8P r e c i s i o n The precision of this method is not known because interlaboratory data are not available. When interlaboratory data are obtained, a precision statemen
38、t will be added at the following revision. Key 1 to 4 Strips 5 Machine direction Figure 2 Sheet divided into four strips 10 cm 10 cm Z i D W = 100 n i=1 Z i nA 100 D W Z i n A BSISO17771:2003ISO :17771(3002)E 4 ISO 3002 Ar llithgr seresvde 9 Test report The test report shall include the following de
39、tails: a) a reference to this International Standard; b) the formulation/designation of the SMC; c) the date of production and batch number; d) the number of viewing fields along the strip examined; e) the degree of fibre wetting ( ); f) the location of the largest single dry spot found as defined b
40、y the number of the viewing field (see Figure 3). For production control purposes, the following information shall also be included: g) the times between production, sampling and testing; h) the temperature of the production room; i) the relative humidity of the production room. Key 1 Machine direct
41、ion 2 Largest single dry spot: strip 2, field 4 (location L2/4) Figure 3 D W BSISO17771:2003blankBS ISO 17771:2003 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on s
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