《BS-4784-2-1988 ISO-6741-2-1987.pdf》由会员分享，可在线阅读，更多相关《BS-4784-2-1988 ISO-6741-2-1987.pdf（12页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 4784-2: 1988 ISO 6741-2: 1987 Methods for Determination of commercial mass of consignments of textiles Part 2: Methods for obtaining laboratory samples ISO title: Textiles Fibres and yarns Determination of commercial mass of consignments Part 2: Methods for obtaining laboratory s
2、amples UDC 677 486:677.072/.073:677.014.332.22:677.25:531.751:.006.25 + 620.11 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:56:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-2:1988 This British Standard, having been prepared under the direction of the Textiles and Clothing Standa
3、rds Committee was published under the authority of the Board of BSI and comes into effect on 29 January 1988 BSI 12-1999 First published as BS 4784 February 1973 First revision in Parts Part 2 January 1988 The following BSI references relate to the work on this standard: Committee reference TCM/32 D
4、raft for comment 85/40128 DC ISBN 0 580 16316 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Textiles and Clothing Standards Committee (TCM/-) to Technical Committee TCM/32, upon which the following bodies were represented: British Ca
5、rpet Manufacturers Association Ltd City of Bradford Conditioning House Confederation of British Wool Textiles Limited Institute of Trading Standards Administration International Wool Secretariat Man-made Fibres Producers Committee Textile Research Council Amendments issued since publication Amd. No.
6、Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:56:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-2:1988 BSI 12-1999i Contents Page Committees responsibleInside front cover National forewordii 0Introduction1 1Scope and field of application1 2References1 3Princi
7、ple1 4Apparatus1 5Sampling procedure2 Figure 1 Zones of a bale2 Figure 2 Layers of inner zone3 Figure 3 Tow in bale5 Table 1 Coring programme for bales, method C13 Table 2 Coring programme for bales, method C24 Table 3 Coring programme for bales, method C34 Publications referred toInside back cover
8、Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:56:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-2:1988 ii BSI 12-1999 National foreword This British Standard has been prepared under the direction of the Textiles and Clothing Standards Committee and forms a Part revision of BS 4784
9、 “Method for the determination of the correct invoice mass (weight) of textiles” which is withdrawn. This Part of BS 4784 is identical with ISO 6741-2 “Textiles Fibres and yarns Determination of commercial mass of consignments Part 2: Methods for obtaining laboratory samples”, published in 1987 by t
10、he International Organization for Standardization (ISO). The International Standard comprises four Parts as follows: ISO 6741-1, Mass determination and calculations. ISO 6741-2, Methods for obtaining laboratory samples. ISO 6741-3, Specimen cleaning procedures. ISO 6741-4, Values used for commercial
11、 allowances and the commercial moisture regains. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards;
12、 attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” and “part of ISO 6741” appear, referring to this standard,
13、they should be read as “British Standard” and “Part of BS 4784”, respectively. 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 co
14、nfer immunity from legal obligations. Cross-references International StandardCorresponding British Standard ISO 6348:1980BS 1051:1981 Glossary of terms relating to the conditioning, testing and mass determination of textiles (section 2) (Technically equivalent) ISO 6741-1:1987BS 4784 Methods for det
15、ermination of commercial mass of consignments of textiles Part 1:1988 Mass determination and calculations (Identical) ISO 6741-4:1987 to which reference is made in the text is reproduced as national Appendix A of BS 4784-1:1988. Summary of pages This document comprises a front cover, an inside front
16、 cover, pages i and ii, pages 1 to 6, 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. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 0
17、7:56:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-2:1988 BSI 12-19991 0 Introduction This document forms part 3 of a four-part International Standard prepared by ISO/TC 38, Textiles. Part 1: Mass determination and calculations; Part 2: Methods for obtaining laboratory samples; Part 3: Speci
18、men cleaning procedures; Part 4: Values used for the commercial allowances and the commercial moisture regains. (Technical Report.) The terminology used in this International Standard is in accordance with ISO 6348. Most contracts of sale between buyer and seller specify either that the invoice mass
19、 of a consignment shall be determined by an independent third party, or that the sellers figure may be subject to an independent third-party check. This part of ISO 6741 describes the methods which are to be used by the independent third party in these cases. The figure for the commercial mass which
20、 results from the application of the procedures in this part of ISO 6741 either becomes the invoice mass of the consignment or is compared with the declared invoice mass plus or minus the tolerance agreed between the buyer and seller. It is not intended that the methods in this part of ISO 6741 nece
21、ssarily be used by the seller to establish his invoice mass. The methods described in this part of ISO 6741 are, for the most part, destructive. 1 Scope and field of application This part of ISO 6741 specifies methods for obtaining laboratory samples for mass determination by one of the methods give
22、n in ISO 6741-1. The method appropriate for particular fibres is indicated in ISO 6741-4. The procedures comprise: When a replicate sample is required for other tests or as a precaution against misadventure, the mass taken during sampling shall be doubled and the sample shall then immediately be hal
23、ved to provide the two samples. 2 References ISO 6348, Textiles Determination of mass Vocabulary. ISO 6741, Textiles Fibres and yarns Determination of commercial mass of consignments Part 1: Mass determination and calculations Part 4: Values used for the commercial allowances and the commercial mois
24、ture regains. (Technical Report.) 3 Principle Laboratory samples are taken from the containers in the consignment samples obtained as specified in ISO 6741-1 and placed in stoppered, air-tight vessels for subsequent processing. 4 Apparatus Air-tight vessels, of low hygroscopicity and known mass, cap
25、able of holding the material being tested. For example, a stoppered glass jar or a clean, grease-free polyethylene bag of minimum thickness 70 4m, inside a second similar polyethylene bag, is sometimes used. In the latter case, both bags shall be sealed and free of holes. Nature of consignmentProced
26、ure described Bulk staple in bales Hand sampling (two methods) Core sampling Tow and strands in bales and cases Hand sampling Unsupported wound or coiled packages of raw silk, tow silver, top or yarn in containers Hand sampling Yarn wound on supports Cutting method Winding (four methods) Licensed Co
27、py: sheffieldun sheffieldun, na, Fri Dec 01 07:56:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-2:1988 2 BSI 12-1999 5 Sampling procedure Sample, preferably immediately after weighing each container in the consignment sample as specified in 6.2 of ISO 6741-1, in accordance with 5.1, 5.2 or 5
28、.3, as appropriate. 5.1 Consignments of bulk staple in bales 5.1.1 Method A Remove the bale wrappers. Take samples from the bale in such a manner that each sample is taken from the appropriate zone described below; no more than 30 s elapse between the exposure of a sample and its confinement in an a
29、ir-tight vessel (clause 4). Samples may be taken with a hook, but any handling shall be carried out with gloves of an impervious material. Consider the bale as being made up of two zones, inner and outer, both of about the same volume (see Figure 1). The dimensions of the inner zone shall be 80 % of
30、 those of the bale, i.e. the thickness of the outer layer represents 10 % of the corresponding dimension of the bale. a) From the outer zone take 12 samples, each weighing about 5 g, two being taken from each face at randomly different positions and depths within the layer. b) From the inner zone ta
31、ke a further six samples, each weighing about 10 g. Consider the inner zone to be made up of six equal layers (see Figure 2), three layers above and three layers below the centre line of the bale, and take one sample at random from each of these layers. As each sample is taken from the bale, place i
32、t immediately into a pre-weighed, air-tight vessel. There should finally be about 120 g of fibre in the vessel. 5.1.2 Method B Remove the bale wrappers. Use a hand sampling method similar to that described in 5.1.1. Employ three distinct points of sampling situated on a diagonal line of the parallel
33、epiped constituted by the bale and positioned at 20 %, 50 % and 80 % of its length. Take one sample, mass at least 150 g, at each point and place it immediately into a pre-weighed, stoppered, air-tight vessel (clause 4). The mass of the staple in the vessel should finally be about 500 g. Figure 1 Zo
34、nes of a bale Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:56:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-2:1988 BSI 12-19993 5.1.3 Method C Select and use one of the following methods1). 5.1.3.1 Method C.1 Use a core sampler with a non-rotating coring tube with manual pressur
35、e, The diameter of the cutting tip (which shall be sharp to achieve good bale penetration) shall be 12 to 25 mm and the tube length shall be 600 + 20 mm. Clear the point of tube penetration and insert the corer in a direction which is parallel to the sides of the bale in the direction of compression
36、 to a depth of not less than 47 % of the bale length. Extract not less than 35 core samples at random from the consignment sample in accordance with Table 1. Place the samples from each bale immediately into a pre-weighed, stoppered, air-tight vessel. Use either one vessel per bale or, if a global s
37、ample is to be used, one or more large vessels between which all the cores from all the containers are equally divided. Table 1 Coring programme for bales, method C1 Figure 2 Layers of inner zone 1) Methods C1 and C2 are based upon the IWTO manual and machine coring procedures respectively. Number o
38、f bales in the consignment sample Number of cores per bale Number of cores from each face of the balea 13518/17 2189/9 3126/6 495/4 574/3 663/3 7, 853/2 9, 10, 1142/2 12 to 1732/1 18 to 3421/1 35 and above11/0 a Core alternately through the cap and base. Licensed Copy: sheffieldun sheffieldun, na, F
39、ri Dec 01 07:56:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-2:1988 4 BSI 12-1999 5.1.3.2 Method C2 Use a core sampler with a non-rotating coring tube with mechanical pressure. The diameter of the cutting tip (which shall be sharp to achieve good bale penetration) shall be 18 1 mm2) and the
40、 tube length shall be sufficient to achieve a depth of penetration of at least 90 % of the bale length. Clear the point of tube penetration on the base of the bale and insert the corer in a direction which is parallel to the sides of the bale in the direction of compression to the full depth of the
41、tube. Extract not less than 20 core samples at random from the consignment sample in accordance with Table 2. Place the samples from each bale immediately into a stoppered, air-tight vessel. Use either one vessel per bale or, if a global sample is to be used, one or more large vessels between which
42、all the cores from all the containers are equally divided. In the case of high-density bales (more than 450 kg/m3), special equipment shall be employed. The commercial mass of high-density bales can nevertheless be determined by partial or complete removal of wrappers, followed by methods B, C1 and
43、C2. Table 2 Coring programme for bales, method C2 5.1.3.3 Method C3 Use a core sampler with a non-rotating coring tube with manual pressure. The diameter of the cutting tip (which shall be sharp to achieve good bale penetration) shall be 25 1 mm and the tube length shall be 600 20 mm. Clear the poin
44、t of tube penetration and insert the corer in a direction which is parallel to the sides of the bale in the direction of compression to a depth of about 90 % of the bale length. Extract from each bale the number of cores indicated in Table 3. Place the samples from each bale immediately into a pre-w
45、eighed, stoppered, air-tight vessel (clause 3). Use either one vessel per container or, if a global sample is to be used, one or more large vessels between which all the cores from all the containers are equally divided. Table 3 Coring programme for bales, method C3 5.2 Consignments of tow and stran
46、ds in bales or cases As with staple fibre, wear impervious gloves when handling the material. 5.2.1 Method D Take a sample of about 30 g from the material at the top of the bale or case. Take three further samples, each of about 20 g, from the interior of the bale, at points P, Q, and R in a middle
47、layer of the bale shown in Figure 3. One point is at the centre of the layer and the other two half-way between the centre and the surface of the bale. Access to this middle layer may be obtained either by winding off or by lifting off the upper layers. Take a fifth sample (of about 30 g) from the m
48、aterial at the bottom of the bale or case. 2) The interested parties may agree to use a cutting tip with a diameter between 12 and 25 mm. Number of bales in the consignment sample Number of cores per bale 120 210 37 45 5, 64 7, 8, 93 10 to 192 20 and above1 Number of bales in the consignment sample
49、Number of cores per bale Bale mass 150 to 250 kg Bale mass above 250 kg 135 234 334 4 to 1123 12 and above12 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:56:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-2:1988 BSI 12-19995 Take the samples immediately after exposing the surface concerned, with a maximum delay of 30 s. As each sample is taken from a single bale or case, place it immediately into a pre-weighed air-tight vessel (clause 3). There should finally be about