1、BRITISH STANDARD BS ISO 6741-1:1989 Textiles Fibres and yarns Determination of commercial mass of consignments Part 1: Mass determination and calculations ICS 59.060.01; 59.080.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 6741-1:1989 This British Standard, having b
2、een prepared under the direction of the Materials and Chemicals Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 21 May 2002 BSI 21 May 2002 ISBN 0 580 39667 3 National foreword This British Standard reproduces verbatim ISO 674
3、1-1:1989 and implements it as the UK national standard. It supersedes BS 4784-1:1988 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee TCI/24, Physical testing of textiles, which has the responsibility to: A list of organizations represented on this com
4、mittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by
5、using the “Find” facility of the BSI Standards Electronic Catalogue. 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 immun
6、ity 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 developments and promulgate them
7、in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 to 10, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendment
8、s issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD IS0 6741-I Second edition 1989-07-01 Textiles - Fibres and yarns - Determination of commercial mass of consignments Part 1: Mass determination and calculations Textiles - Fibres et fils - Dktermination de la masse commerciale du
9、n lot - Partie 7 : Dhtermination de la masse et modes de caicul Reference number IS0 6741-1 : 1989 (E) IS0 6741-1 : 1989 (E) Foreword IS0 (the international Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing Internation
10、al Standards is normally carried out through IS0 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, govern- mental and non-governmental, in liaison with IS
11、O, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their accepta
12、nce as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 6741-1 was prepared by Technical Committee lSO/TC 38, Textiles. This second edition cancels and replaces the
13、 first edition (IS0 6741-1 : 19871, of which it constitutes a minor revision. The only change of any technical significance is in the drying temperature specified for silk in table 1. IS0 6741 consists of the following parts, under the general title yarns - Determination of commercial mass of consig
14、nments : Part 7: Mass determination and calculations Part 2: Methods for obtaining laboratory samples Part 3: Specimen cleaning procedures - Part 4: Values used for regains (Tee hnical Report) the commercial allowances and the commercial moisture Textiles - Fibres and Annexes A, B mation only. and C
15、 form an integral part of this part of IS0 6741. Annex D is for infor- 0 0SI 9891 llA sthgir .devreser oN trap fo siht noitacilbup yam eb decudorper ro dezilitu ni yna mrof ro yb yna ,snaem cinortcele ro ,lacinahcem gnidulcni gniypocotohp dna ,mliforcim tuohtiw noissimrep ni gnitirw morf eht .rehsil
16、bup lanoitanretnI noitazinagrO rof noitazidradnatS esaC elatsop 65 l 1121-HC eveneG 02 l dnalreztiwS detnirP ni dnalreztiwS ii IS0 6741-l : 1989(E) Introduction Most contracts of sale between buyer and seller specify either that the invoice mass of a consignment shall be determined by an independent
17、 third party, or that the sellers figure may be subject to an independent third-party check. IS0 6741, parts 1 to 3, describes the methods which are to be used by the independent third party in these cases. The figure for the commercial mass which results from the application of the procedures in th
18、is part of IS0 6741 either becomes the invoice mass of the consign- ment or is compared with the declared invoice mass plus or minus the tolerance agreeed between the buyer and seller. It is not intended that the methods in this part of IS0 6741 necessarily be used by the seller to establish his inv
19、oice mass. The methods described in this part of ISO 6741 are, for the most part, destructive. The terminology used in this and other parts of IS0 6741 is in accordance with IS0 6343. . . . III This page intentionally leff blank INTERNATIIONAL STANDARD ISO6741-1:1989(E) Textiles - Fibres and yarns -
20、 Determination of commercial mass of consignments - Part 1: Mass determination and calculations 1 Scope This part of IS0 6741 specifies methods for the determination of the commercial mass of homogeneous consignments of those textile fibres and yarns composed of a single generic species listed in pa
21、rt 4. The methods specified in this part of IS0 6741 do not apply to beamed yarns, to coated yarns, to fibres and yarns put up for retail sale or to fibre blends. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this pa
22、rt of IS0 6741. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 6741 are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of
23、IEC and IS0 maintain registers of currently valid International Standards. IS0 139 : 1973, Textiles - Standard atmospheres for conditioning and testing. I SO 1130 : 1975, Textile fibres - Some methods of sampling for testing. IS0 3074 : 1975, Wool - Determination of dichlorome thane- soluble matter
24、in combed sliver. IS0 3534 : 1977, Statistics - Vocabulary and symbols. I SO 5089 : 1977, Textiles - Preparation of labora tory test samples and test specimens for chemical testing. IS0 6348 : 1980, Textiles - Determination of mass - Vocabulary. I SO 6741 : 1987, Textiles - Fibres and yarns - Determ
25、ination of commercial mass of consignments - Part 2: Methods for obtaining laboratory samples. - Part 3: Specimen cleaning procedures. - Part 4: Values used for the commercial allowances and the commercial moisture regains (Technical Report). 3 Principle The commercial mass of a consignment is the c
26、alculated mass that a consignment of textile material would have if either the mass corresponding to the commercial moisture regain was added to the dried mass of the material or the mass corres- ponding to the commercial allowance was added to the extracted and dried mass of the material. The follo
27、wing operations are necessary to determine commercial mass : a) take a representative consignment sample; b) either determine the net mass of the consignment or determine the net and invoice this consignment sample; masses of each container in c) assemble laboratory samp container in the consignment
28、 IS0 67412) ; es from the contents of each sample (in accordance with d) weigh and, if necessary, sub-divide each laboratory sample; e) clean each laboratory sample by washing, extraction with an organic solvent or pyrolysis (in accordance with IS0 6741-3) ; f) dry each laboratory sample; g) determi
29、ne the clean dry mass (or the dry mass) of each laboratory sample; h) calculate the commercial mass of the consignment. In some circumstances, operation c) precedes operation b); operation e) may sometimes be omitted. When the commercial mass of a consignment is determined by drying without cleaning
30、, use the procedure outlined in annex C if the commercial mass is to be adjusted to a specified extractibles content. IS0 6741-l : 1989 (E) 4 Definitions 5 Apparatus Terms and definitions relating to mass determination of textiles are given in IS0 6343; those for sampling are given in IS0 5089, IS0
31、1130 and IS0 3534. 5.1 Weighing instruments For the purposes of this part of IS0 6741, the following defini- tions also apply: a) for containers, capable of weighing containers in the consignment with an accuracy of 0,l % ; b) for samples, capable of weighing masses in the range 10 g to 500 g with a
32、n accuracy of 0,05 %. 4.1 consignment: All the containers of a textile material of one defined type and quality, delivered to one customer ac- cording to one dispatch note. 4.2 container: Units of packaging within the consignment (a carton, a case, a bale, etc.) the identification of which is quoted
33、 explicitly on the dispatch note. Containers may or may not contain packages (see 4.4). 5.2 Air-tight vessels, of low hygroscopicity and known mass, capable of holding the material being tested. For example, a stoppered glass jar or a clean, grease-free polyethylene bag of a minimum thickness 70 pm,
34、 sealed inside a second similar polyethylene bag, is sometimes used. In the latter case, the bags shall be sealed and free of holes. 4.3 global sample: A sample obtained by a technique in which the laboratory sample is assembled by aggregating all the samples taken by partial sampling or by total sa
35、mpling. 5.3 Drying apparatus, capable of drying samples under the conditions specified in table 1. A ventilated drying oven or ap- paratus designed for forced-air drying with or without a built-in balance is suitable. The air flow close to the sample shall have a speed of not less than 0,2 m/s and p
36、referably not more than 1 m/s. 4.4 net mass: The mass of the textile material alone, ob- tained by subtracting the tare from the gross mass. NOTE - Details of precautions necessary when using an external balance are given in annex D. 4.5 package: Elementary units (which can be unwound) within each c
37、ontainer in the consignment. They might be bump top, hanks, skeins or supports on to which have been wound tow, top, sliver, roving, yarn or cord. A forced-air drying oven shall not be used for acrylic fibre. The air entering the oven shall be the standard atmosphere for testing specified in IS0 139
38、. The procedure in annex A may be used when this is not possible. 4.6 partial sampling : A consignment sampling technique in which the laboratory sample is assembled from samples taken from selected treatment containers in the consignment. The samples are kept separate for further treatment. 6 Proce
39、dure 4.7 support: A former on to which textile material may be wound. If the consignment comprises more than one type of container or support, treat each homogeneous group as a separate con- signment. 4.8 total sampling : A consignment-sampling technique in which a separate laboratory sample is take
40、n from every con- tainer in the consignment. The samples are kept separate for further treatment. Set aside and report all the containers in the consignment which show any signs of damage or unusual dampness incur- red in the course of transport, as well as any that have been opened. The commercial
41、mass of such containers shall be determined by methods agreed between the interested parties. Table 1 - Drying conditions Material Oven temperature OC Specified drying duration Acrylic Chiorofibre Silk Textile glass All other fibres 110 I!I 2 77 _+ 2 140 It 2 Pyrolysis necessary, see IS0 6741-3. 105
42、 I!I 2 2 h + 1 %I) Dry to constant mass. Dry to constant mass. I 1) See paragraph 2 in 5.3. 2 IS0 6741-l : 1989 (El 6.1 Determination of the net mass or the invoice mass of the consignment If the commercial mass determined in accordance with this part of IS0 6741 is to become the invoice mass of the
43、 consignment, determine the net mass of the consignment by weighing every container in the consignment (see 6.4) and establishing the total net mass of the consignment: total net mass = gross mass - total tare. If, however, the purpose is to check the declared invoice mass, then ensure that the invo
44、ice mass of the consignment and of each container in the consignment is available. 6.2 Selection of the consignment sample When the commercial mass determined by the methods in this part of IS0 6741 is to become the invoice mass of a consign- ment, the consignment sample shall comprise either all th
45、e containers in the consignment (total sampling) or a selection of the containers in the consignment (partial sampling). When the commercial mass determined by the methods in this part of IS0 6741 is to be used as a check of the invoice mass of a consignment, total sampling may not be necessary: par
46、tial sampling can be employed in conjunction with an eventual check that sufficient containers have been sampled. The number of containers to be selected for sampling depends upon the expected variability of the moisture content of the material in the containers. Where this is unknown or high, sampl
47、e all the containers (total sampling); where it is low, select fewer containers (partial sampling). In the latter case, however, there are circumstances in which the sampling of ad- ditional containers becomes necessary, so it is recommended that from a first selection of containers some be taken fo
48、r im- mediate sampling whilst the remainder are set aside for use if needed. 6.2.1 Total sampling method (see 4.8) Sample all the containers. 6.2.2 Partial sampling method (see 4.6) Make a first selection of containers in accordance with table 2 at random from the consignment. Sub-divide the first s
49、election into a consignment sample and a reserve. Set aside the reserve for possible future sampling (see clause 7). 6.2.3 Global sample (see 4.3) If a global sample is required, assemble the laboratory sample by aggregating all the samples obtained in accordance with 6.2.1 or 6.2.2. 6.3 Determination of the net mass of the contents of each container in the consignment sample Determine the gross mass (i.e. the mass of textile fibre or yarn, external and internal wrapping materials, container and yarn supports) of each container by weighing, to an accuracy of 0,I %, using the w
