CGSB 4 2 NO 73 3-M91-CAN CGSB-1991 Textile Test Methods Wool - Determination of Short -Term Irregularity of Linear Density of Slivers Rovings and Yarns by Means of an Electronic Ev.pdf

1、C ANIC GSB -4.2 NO. 73.3-M91/ NATIONAL STANDARD OF CANADA IS0 2649: 1974 Textile Test Methods Wool - Determination of Short-Term Irregularity of Linear Density of Slivers, Rovings and Yarns, by Means of an Electronic Evenness Tester Prepared by the International Organization for Standardization Revi

2、ewed by the Canadian General Standards Board Copyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CGSB CAN/CGSB-Y.Z N0.73.3-fl9L * M 107Yb50 0011913 964 = The CANADIAN GENERAL STANDARDS BO

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20、thout license from IHS-,-,-NATIONAL STANDARD OF CANADA C AN/CGSB-4.2 NO. 73.3-M91/ IS0 2649:1974 TEXTILE TEST METHODS WOOL - DETERMINATION OF SHORT-TERM IRREGULARITY OF LINEAR DENSITY OF SLIVERS, ROVINGS AND YARNS, BY MEANS OF AN ELECTRONIC EVENNESS TESTER Prepared by the International Organization

21、for Standardization Reviewed by the Canadian General Standards Board ss Standards Council of Canada Approved by the Published June 1991 by the Canadian General Standards Board Ottawa, Canada K1A 1G6 Minister of Supply and Services Canada - 1991 No part of this publication may be reproduced in any fo

22、rm without the prior permission of the publisher. Copyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CANADIAN GENERAL STANDARDS BOARD COMMITTEE ON TEXTILE TEST METHODS Crown, Dr. E.M. Ch

23、airperson Biron, C. Clarke, Mrs. N. Cosman, Ms. V. Demers, A. Dolhan, Mrs. P. Duhamel, Ms. D. Edwards, D.S. Famworth, Dr. B. Graham, M. Grgoire, Miss M. Hurley, Ms. M. Kasem, Dr. M.A. King, Dr. M. Klimes, A. Mitton, Miss M.T. Monk, W.B. Mortimer, R.A. Muniak, Ms. E. Patel, A. Rashid, M.A. Ronsyn, Dr

24、. C. Routhier, D. Scrafton, Ms. K. Randall, Mrs. J. Secretary (Membership at date of approval) University of Alberta Celanese Canada Inc. Du Pont Canada nc. Department of Consumer and Corporate Affairs Professional Association of Cleaners and Launderers of Quebec Department of National Defence Texti

25、le Technology Centre Canadian Carpet Institute Mustang Industries Inc. The Wool Bureau of Canada Ltd. Dominion Fabrics nc. Department of National Revenue (Customs and Excise) Department of Consumer and Corporate Affairs University of Manitoba Dominion Textile Inc. consultant Consultant ORTECH Intern

26、ational The T. Eaton Company Canada Ltd. Sears Canada nc. Department of Public Works, Alberta Department of Supply and Services Consoltex Inc. The Retail Research Foundation of Canada Canadian General Standards Board Acknowledgment is made for the French translation of this National Standard of Cana

27、a by the Translation Bureau of the Department of the Secretary of State. CANICGSB-4.2 NO. 73.3-M9l/ IS0 2449:1974 Copyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-B D 1 I I 1 i I TEXTI

28、LE TEST METHODS Ottawa Canada K1A 1G6 Preface to the National Standard of Canada CGSB CAN/CGSB-4=2 N0*73-3-M9L * = LB74650 OOLL9Lb 673 CANKGSB-4.2 NO. 73.3-M91/ IS0 2649:1974 National Standard of Canada I l I I This National Standard of Canada has been prepared by the CGSB Committee on Textile Test

29、Methods. It is identical in content and in layout with the International Standard IS0 2649, Wool - Determination of short-term irregularity of linear density of slivers, rovings and yams by means of an electronic evenness tester, published 1974-12-15 by the International Organization for Standardiza

30、tion (ISO), The international standard was reviewed by the CGSB committee to determine its suitability for Canadian use. It was agreed to use it in total, without editorial changes. Throughout this standard, the words “National Standard of Canada” are to be understood as replacing the words “Interna

31、tional Standard” wherever they appear. Some terminology and conventions are not identical to those used in other test methods within CANKGSB-4.2-M - Textile Test Methods. For example, the comma is used throughout this standard as a decimal marker rather than the point. The testing and evaluation of

32、a product against this method may require the use of materials and/or equipment that could be hazardous. This document does not purport to address all the safety aspects associated with its use. Anyone using this method has the responsibility to consult the appropriate authorities and to establish a

33、ppropriate health and safety practices in conjunction with any existing applicable regulatory requirements prior to its use. The referenced international standard may be obtained from the Standards Council of Canada, Standards Sales Branch, 350 Sparks Street, Suite 1200, Ottawa, Ontario KIP 6N7. Cop

34、yright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CGSB CAN/CGSB-q.Z N0.73.3-M91 XX L87Yb50 0011917 50T W INTERNATIONAL STANDARD IS0 2649-1974 (E) Wool - Determination of short-term irregul

35、arity of linear density of slivers, rovings and yarns, by means of an electronic evenness tester O INTRODUCTION The determination of short-term cross-sectional irregularity is of great importance, both for the evaluation of sliver or yarn quality and for an active control of preparation for spinning

36、. In order to obtain an irregularity value as near as possible to a well-defined absolute value, it is necessary to standardize the test method applied for the determination, and to observe certain precautions in the control and operation of the evenness tester. The object of this International Stan

37、dard is to give the necessary guidance in this respect. 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies a method applicable for the determination of short-term irregularity of linear density of yarns, rovings and slivers of pure wool, from 5 tex up to 40 kilotex. . The method

38、is not directly applicable to fibre blends. 2 GENERAL The aim of a measurement of short-term cross-sectional irregularity obtained by an electronic evenness tester is to evaluate the total cross-sectional irregularity for the yarn or sliver delivered by one machine head. Appreciable differences in m

39、ean count may, in fact, exist between various heads of the same machine (.e. in linear density determined on lengths between about 20 and 100m). These differences between heads will not be included in the total cross-sectional irregularity considered here, as the variations from the mean are determi

40、ned for each head in relation to the mean linear density of the material delivered by the head in question. Thus an evaluation is made of the dispersion between the masses of short lengths L, of yarn or sliver within a very long length L, corresponding to the total length of a production unit delive

41、red by one machine head. (This production unit may be a ball of top, a can of preparation sliver or roving, a package of yarn, etc.) The parameter used to characterize this dispersion will be the coefficient of variation between the masses of the lengths L, within the length L, (b = between, p = pac

42、kage). In principle, to obtain a value as near as possible to the total cross-sectional irreguiarity L, should tend towards O and L, towards infinity. In practice, as the components of the high frequency spectrum make only a small contribution to the total irregularity, there is not much point in re

43、ducing L, below about 10 mm; moreover, considerations of maximum sensitivity and admissible drift for electronic evenness testers prevent a value much lower than this limit being used. Length L, for electronic evenness testers is generally 1 O * 3 mm for yarns and rovings, and may reach 20 rnm for s

44、livers. Regarding L ,. experience shows that irregularity within a length of 250 m (yarn or sliver) is practically always comparable with total irregularity. The coefficient of variation CV (i, 250 ml), with L, = 10 i 3 mm will thus be considered as a reference measurement to which the result obtain

45、ed with the evenness tester must correspond as closely as possible. In its normal method of operation (Normal Test) an electronic evenness tester fitted with an “integrator“ enables the evaluation of the coefficient of variation cv, or the coefficient of deviation CD designated as U1 1, between the

46、masses of short lengths f , within a long length L,21, these lengths being defined as follows : 1) Length L, is practically equal to length L, (measured in the yarn direction) of the electrodes of the measuring condenser. On any one machine it may vary for different forms of material according to th

47、e condenser chosen. The lengths L of the Zellweger-Uster evenness tester for yarns, rovings and slivers, are given in clause 3. 1) The coefficient of deviation CD or mean deviation divided by the mean 1s designated “U“ on the dial of the Zellweger-Uster integrator 2) L, w = within. NO. 73.3-M91 1 Co

48、pyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CGSB CAN/CGSB-4-2 N0.73.3-fl91 * 1874650 0011918 44b = IS0 2649-1974 (E) 2) Length L, is determined by the following three factors, the t

49、hird being of minor importance : a) the electrical characteristics of the integrator (more precisely : the time constants T, and T, expressed in seconds); b) the running speed V of the yarn or sliver in the machine expressed in metres per second; c) the slope (- n) in logarithmic co-ordinates of the length variance curve B(L) of the specimen yarn or sliver. (n is a function of the relative size of the long-term irregularities. The B(L) curve is defined as the CV