1、BRITISH STANDARD BS 7658-2: 1993 ISO 10120: 1991 Carbon fibre Part 2: Method for determination of linear densityBS7658-2:1993 This British Standard, having been prepared under the directionof the Plastics andRubber Standards PolicyCommittee, was publishedunder the authorityofthe Standards Boardand c
2、omes into effect on 15 April 1993 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference PRM/41 Draft for comment 90/42526 DC ISBN 0 580 21727 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the P
3、lastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/41, upon which the following bodies were represented: British Plastics Federation Department of Trade and Industry (National Physical Laboratory) Ministry of Defence Motor Industry Research Association Amendments issued
4、 since publication Amd. No. Date CommentsBS7658-2:1993 BSI 10-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Principle 1 5 Apparatus 1 6 Sampling 1 7 Atmosphere for testing 1 8 Test specimens 1 9 Procedure 2 10
5、 Expression of results 2 11 Precision 2 12 Test report 2 Table 1 1 List of references Inside back coverBS7658-2:1993 ii BSI 10-1999 National foreword This Part of BS7658 has been prepared under the direction of the Plastics and Rubber Standards Policy Committee and is identical with ISO10120:1991 Ca
6、rbon fibreDetermination of linear density, prepared by the International Organization for Standardization (ISO). The Technical Committee has reviewed the provisions of ISO1886, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this
7、 standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International
8、 Standard Corresponding British Standard ISO 291:1977 BS 2782 Methods of testing plastics Part 0:1992 Introduction (Appendix A is identical) ISO 1144:1973 BS 947:1970 Specification for a universal system for designating linear density of textiles (Tex system) (Technically equivalent) Summary of page
9、s This document comprises a front cover, an inside front cover, pages i and ii, pages1 and2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS
10、7658-2:1993 BSI 10-1999 1 1 Scope This International Standard specifies a method for determining the linear density (mass per unit length) of carbon fibre yarns. When the determination of the linear density is carried out on sized fibre, a correction shall be made by calculation based on the size co
11、ntent (see10.2). The linear density determined by the method specified in this International Standard does not consider the influence of twist in the yarn. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this Internati
12、onal Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Mem
13、bers of IEC and ISO maintain registers of currently valid International Standards. ISO 291:1977, Plastics Standard atmospheres for conditioning and testing. ISO 1144:1973, Textiles Universal system for designating linear density (Tex System). ISO 1886:1990, Reinforcement fibres Sampling plans applic
14、able to received batches. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 size all materials applied to fibres to facilitate the handling and use of the fibre and/or to promote the adhesion of a matrix material to the surface of the fibre 3.2 size
15、content the mass of the size expressed as a percentage of the mass of the sized carbon fibre filament yarn 3.3 linear density the mass per unit length of a carbon fibre yarn, expressed in the tex system (seeISO1144) 3.4 pre-tension the tension applied to a specimen when determining the linear densit
16、y 4 Principle The mass per unit length, in grams per kilometre (tex), is determined by weighing a test specimen of known length, the length being measured at a specified pre-tension. 5 Apparatus 5.1 Analytical balance, readable to0,1mg. 5.2 Cutting device, for cutting test specimens to the required
17、length, to an accuracy of1mm, under the required pre-tension. 5.3 Hot-air oven, capable of being maintained at a temperature of105 C 5 C. 5.4 Desiccator, containing calcium chloride or another suitable drying agent. 5.5 Wrap reel, for unwinding the yarn, the reel perimeter being1m. 6 Sampling The sa
18、mpling plan shall be agreed between the interested parties. 7 Atmosphere for testing The atmosphere for testing shall be one of those defined in ISO291. 8 Test specimens The length in metres of each carbon fibre yarn test specimen shall be selected, according to the expected linear density, in tex,
19、of the sample under test, to give a mass of at least0,25g. Table 1 gives an indication of the carbon fibre yarn lengths required to achieve this. Table 1 Linear density Length of yarn tex m 250 1BS7658-2:1993 2 BSI 10-1999 9 Procedure 9.1 From each package selected in accordance with ISO1886, discar
20、d approximately2m of yarn and take three successive test specimens of length as indicated inTable 1. Take the specimens by applying a pre-tension of4mN/tex to6mN/tex (0,4g/tex to 0,6g/tex), measuring the length of the specimen to an accuracy of1mm and cutting the specimen to the measured length. 9.2
21、 Dry the specimens for1,5h at105 C 5 C. Allow the specimens to cool in a desiccator. NOTE 1This drying procedure may be omitted for types of carbon fibre that do not absorb moisture from the atmosphere, by agreement between the interested parties. 9.3 Weigh each specimen to the nearest 1mg. 10 Expre
22、ssion of results 10.1 The linear density Tt, in tex, of unsized yarn is given by the equation where 10.2 The linear density Tt, in tex, of the carbon fibre in sized yarn is given by the equation where 11 Precision The precision of this test method is not known because inter-laboratory data are not a
23、vailable. Inter-laboratory data are being obtained and a precision statement will be added at the next revision. 12 Test report The test report shall include the following particulars: a) a reference to this International Standard; b) the linear density Tt, in tex, of the yarn for each package teste
24、d, expressed as the mean of the results obtained on the three test specimens; c) any details of the techniques employed that may have had a bearing on the results obtained. m is the mass, in grams, of the test specimen; L is the length, in metres, of the test specimen. S is the size content (3.2), e
25、xpressed as a percentage of the mass of the yarn; a m and L are as defined in10.1. a An International Standard describing the method to be used to determine the size content S will be published at a later date. Until that time the method shall be agreed between the interested parties. Tt m 10 3 L -
26、= Tt m 10 3 L - = 100S () 100 - BS7658-2:1993 BSI 10-1999 List of references See national foreword.BS 7658-2: 1993 ISO10120: 1991 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the U
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