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1、BRITISH STANDARD BS 4784-3: 1988 ISO 6741-3: 1987 Methods for Determination of commercial mass of consignments of textiles Part 3: Specimen cleaning procedures ISO title: Textiles Fibres and yarns Determination of commercial mass of consignments Part 3: Specimen cleaning procedures UDC 677 486:677.0
2、72/.073:677.014.332.22:677.25:531.751:677.021.16:.002.614 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:56:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-3:1988 This British Standard, having been prepared under the direction of the Textiles and Clothing Standards Committee, was pu
3、blished under the authority of the Board of BSI and comes into effect on 29 January 1988 BSI 11-1999 First published as BS 4784 February 1973 First revision in Parts, Part 3 January 1988 The following BSI references relate to the work on this standard: Committee reference TCM/32 Draft for comment 85
4、/40127 DC ISBN 0 580 16317 2 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 Carpet Manufacturers
5、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.Date of issueCommen
6、ts Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:56:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-3:1988 BSI 11-1999i Contents Page Committees responsibleInside front cover National forewordii 0Introduction1 1Scope and field of application1 2References1 3Principle1 4Apparatus and
7、 reagents1 5Procedures1 Annex A Detergent to be used in connection with method B4 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:56:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-3:1988 ii BSI 11-1999 National foreword This British Standard
8、 has been prepared under the direction of the Textiles and Clothing Standards Committee and forms a Part revision of BS 4784 “Method for the determination of the correct invoice mass (weight) of textiles” which is withdrawn. This Part of BS 4784 is identical with ISO 6741-3 “Textiles Fibres and yarn
9、s Determination of commercial mass of consignments Part 3: Specimen cleaning procedures”, published in 1987 by the International Organization for Standardization (ISO). The International Standard comprises four Parts as follows: ISO 6741-1, Mass determination and calculations. ISO 6741-2, Methods fo
10、r obtaining laboratory samples. ISO 6741-3, Specimen cleaning procedures. ISO 6741-4, Values used for commercial 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 wit
11、hout deviation. Some terminology and certain conventions are not identical with those used in British Standards; 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
12、 marker. Wherever the words “International Standard” and “part of ISO 6741” appear, referring to this standard, they should be read as “British Standard” and “Part of BS 4784”, respectively. ISO 6741-4:1987 to which reference is made in the text is reproduced as National appendix A of BS 4784-1:1988
13、. Cross-references International StandardCorresponding British Standard ISO 139:1973BS 1051:1981 Glossary of terms relating to the conditioning, testing and mass determination of textiles (section 1) (Technically equivalenta) ISO 4793:1980BS 1752:1983 Specification for laboratory sintered or fritted
14、 filters including porosity grading (Identical) ISO 6348:1980BS 1051:1981 Glossary of terms relating to the conditioning, testing and mass determination of textiles (section 2) (Technically equivalent) BS 4784 Methods for determination of commercial mass of consignments of textiles ISO 6741-1:1987Pa
15、rt 1:1988 Mass determination and calculations (Identical) ISO 6741-2:1987Part 2:1988 Methods for obtaining laboratory samples (Identical) a This British Standard glossary contains all the relevant information which, in the International Standard is written in terms of requirements. Licensed Copy: sh
16、effieldun sheffieldun, na, Fri Dec 01 07:56:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-3:1988 BSI 11-1999iii ISO 675 and ISO 1833, to which references are made in 5.1.1 and 5.3, are supplied for information only and hence the lack of corresponding British Standards does not affect the val
17、idity of this standard. A related British Standard to ISO 1833 is BS 4407. 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
18、 immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 4, 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
19、 the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:56:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:56:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-3:1988 BSI 11-19991 0
20、 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: Specimen cleaning procedures; Part 4: Values used for the commercial allowances and t
21、he 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 of a consignment shall be determined by an independent third party, or that the
22、 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 results from the application of the procedures in this part of ISO 6741 either
23、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 necessarily be used by the seller to establish his invoice mass. The methods describ
24、ed in this part of ISO 6741 are, for the most part, destructive. 1 Scope and field of application This part of ISO 6741 specifies specimen cleaning procedures to be used when the commercial mass is to be determined in accordance with ISO 6741-1 on a clean and dry basis. The procedure appropriate for
25、 a particular fibre is given in ISO 6741-4. If the commercial mass is to be determined on a dry-only basis, cleaning is omitted. 2 References ISO 675, Textiles Woven fabrics Determination of dimensional change on commercial laundering near the boiling point. ISO 1833, Textiles Binary fibre mixtures
26、Quantitative chemical analysis. ISO 4793, Laboratory sintered (fritted) filters Porosity grading classification and designation. ISO 6348, Textiles Determination of mass Vocabulary. ISO 6741, Textiles Fibres and yarns Determination of commercial mass of consignments Part 1: Mass determination and ca
27、lculations Part 2: Methods for obtaining laboratory samples Part 4: Values used for the commercial allowances and the commercial moisture regains. (Technical Report.) 3 Principle The test specimen, obtained as specified in ISO 6741-1, following the procedures given in ISO 6741-2, is cleaned by the m
28、ethod recommended for the particular fibre in ISO 6741-4. 4 Apparatus and reagents Conventional laboratory apparatus is required. All reagents used shall be chemically pure. 5 Procedures NOTESee sub-clause 6.5 of ISO 6741-1. 5.1 Methods A1 and A2: Washing with soap Enclose the test specimen in an op
29、en-textured bag large enough when closed with a draw-tape to contain the material in a loose state. The bag and its draw-tape shall be made of filament polyamide or polyester yarn and shall have been previously boiled in several lots of distilled water. The oven-dry mass of the bag and its contents
30、shall be determined to an accuracy of 0,05 %. 5.1.1 Method A1 Wash the test specimen (in the bag) at 70 to 75 C in at least 25 times its own mass of a solution made by dissolving 5 g of soap flakes (the soap specified in ISO 675 is suitable) per litre of soft water, i.e. water of hardness not exceed
31、ing 5 mg of calcium carbonate per litre. Keep the specimen moving for 30 min in the solution, maintaining the temperature at 70 to 75 C. Add more soft water at 70 to 75 C, allowing the bath to overflow until all scum and foam have disappeared. Take the bag and its contents out of the bath and expel
32、as much liquid as possible by centrifuging (preferably) or by squeezing. Rinse twice for 5 min in soft water at 85 C, keeping the bag moving in the water. Finally, rinse for 5 min in demineralized water at 85 C. Centrifuge (or squeeze) the specimen after each rinse. Licensed Copy: sheffieldun sheffi
33、eldun, na, Fri Dec 01 07:56:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-3:1988 2 BSI 11-1999 5.1.2 Method A2 Wash the test specimen (in the bag) in a boiling solution at least 25 times its own mass of a solution made by dissolving 2 g of sodium carbonate per litre of soft water, i.e. water
34、 of hardness not exceeding 5 mg of calcium carbonate per litre. Keep the specimen moving for 45 min in the boiling solution. Add more boiling water, allowing the bath to overflow until all scum has disappeared. Take the bag and its contents out of the bath and expel as much liquid as possible by cen
35、trifuging (preferably) or by squeezing. Rinse twice for 5 min in boiling water, keeping the bag moving in the water. Finally, rinse for 5 min in boiling demineralized water. Centrifuge (or squeeze) the specimen after each rinse. 5.2 Method B: Washing with detergent Proceed as in method A1 (5.1.1) bu
36、t use a solution containing 5 g/l of the detergent specified in the Annex in place of a soap solution. 5.3 Method C: Extraction with light petroleum Enclose the test specimen in an open-textured bag large enough when closed with a draw-tape to contain the material in a loose state. The bag and its d
37、raw-tape shall be made of filament polyamide or polyester yarn and shall have been previously extracted with light petroleum. The oven-dry mass of the bag and its draw tape shall be determined to an accuracy of 0,05 %. Place the bag containing the test specimen into either a tared glass Soxhlet thim
38、ble fitted with a sealed-in sintered disc of porosity grade P 40 (see ISO 4793) or into a tared alumina Soxhlet thimble of porosity grade P 40. Carry out an extraction in a Soxhlet apparatus with light petroleum (boiling range 40 to 60 C) for 1 h at a minimum rate of six extraction cycles per hour.
39、Remove the thimble and contents from the extractor, attach them to a filter flask and remove the light petroleum by suction. Place the thimble and contents in a Soxhlet apparatus and extract with water for 2 h at a minimum rate of six extraction cycles per hour. Remove the sample and centrifuge to r
40、emove excess water. (This method is taken from ISO 1833.) 5.4 Method D: Extraction with dichloromethane followed by size removal Enclose the test specimen in an open-textured bag large enough when closed with a draw-tape to contain the material in a loose state. The bag and its draw-tape shall be ma
41、de of unsized or fully desized cotton yarn and shall have been previously extracted with dichloromethane. The oven-dry mass of the bag and its draw tape shall be determined to an accuracy of 0,05 %. Place the bag and its contents in a Soxhlet apparatus and extract with dichloromethane (methylene chl
42、oride) for at least ten cycles. Remove the bag and test specimen and, after evaporation of the solvent, rinse by hand in two lots of soft water (hardness not exceeding 5 mg of calcium carbonate per litre) at 50 C. Transfer to a solution of an enzyme preparation (a 0,05 % to 0,10 % diastatic solution
43、 at pH 6,0 to 7,5 is suitable) and maintain at 50 C until all starchy matter has been shown to be hydrolysed by testing with a 0,5 % solution of iodine in potassium iodide. Finally, wash the specimen in its bag by boiling for 5 min in soft water, cool it and squeeze it by hand. Repeat this last proc
44、ess to give six treatments in all. Centrifuge the sample in its bag to remove excess water. 5.5 Method E: Extraction with methanol Enclose the test specimen in an open-textured bag large enough when closed with a draw-tape to contain the material in a loose state. The bag and its draw-tape shall be
45、made of filament polyester yarn and shall have been previously extracted with methanol. The oven-dry mass of the bag and its draw tape shall be determined to an accuracy of 0,05 %. Transfer the bag containing the test specimen to a 200 ml Soxhlet apparatus and extract with methanol. The amount of me
46、thanol shall be at least 1,5 times the amount of one Soxhlet charge. Continue the extraction for ten cycles. Remove the specimen and centrifuge to remove excess methanol. 5.6 Method F: Washing in soft or distilled water Enclose the test specimen in an open-textured bag large enough when closed with
47、a draw-tape to contain the material in a loose state. The bag and its draw-tape shall be made of filament polyester or polyamide yarn and shall have been previously boiled in several lots of distilled water. The oven-dry mass of the bag and its draw tape shall be determined to an accuracy of 0,05 %.
48、 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:56:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4784-3:1988 BSI 11-19993 Wash the test specimen (in the bag) for 30 min with specimen agitation in at least 60 times its own mass of soft water (hardness not exceeding 5 mg of calcium carbo
49、nate per litre) at 60 to 70 C. Remove the specimen, squeeze gently to expel as much water as possible, place the specimen into a fresh supply of soft water at 60 to 70 C, and agitate for a further 100 min. Rinse for 5 min in distilled water at 20 C. Remove the specimen and squeeze gently to expel as much water as possible. 5.7 Method G: Cleaning by pyrolysis WARNING It is important that fumes do not enter the laboratory, causing a potential build-up of toxic volatile metals such as mercury, cadmium or antimony.