1、BRITISH STANDARD BS 5058:1973 Method for The assessment of drape of fabrics UDC 677.016.671.2BS5058:1973 This British Standard, having beenapproved by the Textile Divisional Council, was publishedunder the authority ofthe Executive Board on 10 December 1973 BSI 11-1999 The following BSI references r
2、elate to the work on this standard: Committee reference T/16/3 Draft for comment 71/706 75 ISBN 0 580 07939 2 Co-operating organizations The Textile Divisional Council, under whose supervision this British Standard was prepared, consists of representatives from the following Government department an
3、d scientific and industrial organizations: British Railways Board British Textile Employers Association Consumers Association Consumer Standards Advisory Committee of BSI Cotton Industry Standards Committee Jute Industry Standards Committee Linen Industry Standards Committee London Transport Executi
4、ve Man-made Fibres Industry Standards Committee Ministry of Defence Ropes and Cordage Industry Standards Committee Silk Industry Standards Committee Society of Dyers and Colourists Textile Institute* Textile Machinery Industry Standards Committee Trades Union Congress Wool Industry Standards Committ
5、ee The organization marked with an asterisk in the above list is represented on the standing Joint Committee for Textile Test Methods, the members of which were appointed by the Textile Institute and the Textile Divisional Council, and which was entrusted with supervising the preparation of this Bri
6、tish Standard. They were drawn from: Association of Jute Spinners and Manufacturers Manchester Chamber of Commerce Testing House Shirley Institute University of Leeds Wira Amendments issued since publication Amd. No. Date of issue CommentsBS5058:1973 BSI 11-1999 i Contents Page Co-operating organiza
7、tions Inside front cover Foreword ii 1 Scope 1 2 Principle 1 3 Definitions 1 4 Apparatus 1 5 Conditioning and testing atmosphere 1 6 Preparation of test specimens 1 7 Test procedure 1 8 Calculation and expression of results 2 9 Test report 2 Appendix A Apparatus 3 Figure 1 Section through the test a
8、pparatus 3 Publication referred to 4BS5058:1973 ii BSI 11-1999 Foreword The characteristic of drape of fabric is complex, and this standard provides a simple method of measuring this property from the deformation by gravity of an initially horizontal annular ring of fabric. A measure of drape is obt
9、ained as a single number with a theoretical maximum of 100 and minimum of zero. The specimen deforms with multi-directional curvature and the result is, therefore, dependent upon the shear stiffness of the fabric in addition to the bending stiffness. The procedure may be used for measuring the effec
10、t of variables of fabric construction and finish, for the control of batches and deliveries and for quality control. A paper on the reproducibility of the method was published in “Textile Institute and Industry”, January 1972. A British Standard does not purport to include all the necessary provisio
11、ns 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. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an in
12、side 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.BS5058:1973 BSI 11-1999 1 1 Scope This British Standard describes a method of test for the assessmen
13、t of drape of fabrics, and is applicable to all fabrics intended for end uses in which drape is important. NOTEThe title of the British Standard referred to in this standard is given on page 4. 2 Principle A circular fabric specimen is held concentrically between smaller horizontal discs, and an ann
14、ular ring of fabric is allowed to drape into folds around the lower supporting disc. The shadow of the draped specimen is cast onto an annular ring of paper of the same size as the unsupported part of the fabric specimen. The outline of the shadow is traced onto the ring of paper, the mass of which
15、is then determined. The paper is then cut along the trace of the shadow and the mass of the inner part representing the shadow is determined. The drape coefficient is calculated from the two masses. 3 Definitions For the purposes of this British Standard the following definitions apply: 3.1 fabric d
16、rape the extent to which a fabric will deform when it is allowed to hang under its own weight 3.2 drape coefficient the percentage of the total area of an annular ring of fabric obtained by vertically projecting the shadow of the draped specimen 4 Apparatus The following apparatus is required: 1) A
17、test apparatus consisting of: a) two horizontal discs of diameter18cm between which the specimen is held, the lower disc having a central locating pin, b) a point source of light positioned centrally beneath the discs and at the focus of a concave parabolic mirror which reflects parallel light verti
18、cally upwards and so casts a shadow of the draped annular ring of fabric onto an annular ring of paper placed centrally above the discs on the lid of the instrument and c) a centre plate on the lid to locate the paper ring. (SeeAppendix A andFigure 1.) Other apparatus giving results similar to those
19、 obtained using the above apparatus may be used. 2) Three circular templates suitably adapted to facilitate marking the centre of the test specimen. 3) Annular rings of translucent paper, of internal diameter18cm and external diameter equal to the diameter of the test specimen. These may be obtained
20、 from the manufacturer of the apparatus described in1). 4) Balance capable of determining mass to an accuracy of0.01g. 5 Conditioning and testing atmosphere The atmosphere required for conditioning and testing is the standard atmosphere for testing textiles as specified inBS1051, i.e. a relative hum
21、idity of 65 2% and a temperature of20 2 C. 6 Preparation of test specimens 6.1 Conditioning. Condition the fabric to be tested for at least24hours in the atmosphere specified in Clause5. 6.2 Selection of template. Select the appropriate template for the fabric under test. NOTEThe following informati
22、on on appropriate template diameters is given for guidance: 1) diameter24cm for limp fabrics, i.e. those producing a drape coefficient below approximately30% with template of diameter30cm; 2) diameter30cm for medium fabrics; 3) diameter36cm for stiff fabrics, i.e. those producing a drape coefficient
23、 above approximately 85% with template of diameter30cm. Results using test specimens of different diameters are not directly comparable. 6.3 Marking and cutting. Place the fabric free from creases on a flat horizontal surface and by means of a template trace the specimens, mark the centre of each, a
24、nd cut them out. Ensure that the specimens represent adequately the fabric under test. 6.4 Number. Take at least two test specimens. 7 Test procedure 7.1 Testing atmosphere. Conduct the procedure in the standard atmosphere for testing textiles specified in Clause5. Template A 24 cm diameter Template
25、 B 30 cm diameter Template C 36 cm diameterBS5058:1973 2 BSI 11-1999 7.2 Checking the drape test apparatus 7.2.1 Ensure that the centre plate on the lid is horizontal, making adjustments by means of levelling feet in the base or other suitable means. Switch on the light. 7.2.2 Ensure that the filame
26、nt of the lamp is at the focus of the parabolic mirror, by placing a paper ring of diameter30cm centrally on the annular support disc of the apparatus. A centrally situated shadow of diameter30cm should be cast on a36cm diameter annular ring placed in position on the lowered lid of the apparatus. 7.
27、3 Detailed procedure 7.3.1 Place the specimen on the lower horizontal disc of the apparatus so that the pin passes through the centre of the specimen. Then position the top disc on the specimen with the pin fitting into the hole in the top disc. 7.3.2 Lower the lid of the apparatus. 7.3.3 Place an a
28、nnular ring of paper Clause4 3), of the same outside diameter as the test specimen, on the lid. 7.3.4 Switch on the light and without delay draw around the periphery of the shadow on the paper ring. 7.3.5 Remove the paper ring and fold it so that the mass can be determined. Determine the mass of the
29、 paper ring to the nearest 0.01g (M 1 ). 7.3.6 Cut the paper ring around the periphery of the shadow which was drawn on the paper and discard the area of the paper ring which was not shaded. 7.3.7 Determine the mass of the residual portion of the paper ring to the nearest0.01g (M 2 ). 7.3.8 Repeat t
30、he procedure from7.3.1 to7.3.7, on the same specimen but with the other surface uppermost. 7.4 Number of tests 7.4.1 Carry out twice more the procedure described in7.3, making a total of six measurements on the same specimen. 7.4.2 Test the second specimen as described in7.3 and7.4.1. 8 Calculation
31、and expression of results 8.1 Calculate the drape coefficient for each test as follows: 8.2 Calculate the mean drape coefficient. 9 Test report The report shall state: 1) that the procedure was conducted in accordance with this British Standard; 2) the diameter of the test specimen; 3) the number of
32、 specimens tested, and 4) the drape coefficient for each test and the mean drape coefficient. Drape coefficient = where M 1 = total mass of the paper ring, and M 2 = mass of the shaded area of the paper ring. M 2 100 M 1 -BS5058:1973 BSI 11-1999 3 Appendix A Apparatus A.1 Apparatus to meet the requi
33、rements of Clause4 1) can be obtained from: Web Processing Limited Pownall Hall Farm Wilmslow Cheshire A.2 Apparatus formerly supplied by Rotrakote is also suitable. Figure 1 Section through the test apparatusBS5058:1973 BSI 11-1999 4 Publication referred to This standard makes reference to the foll
34、owing British Standard: BS 1051, Glossary of terms relating to the conditioning and testing of textiles. BS5058:1973 BSI 11-1999 BSI Certification Trade Mark The Kitemark The British Standards Institution is the owner of a registered certification trade mark. It is usually associated with the words
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36、produced under a system of supervision, control and testing, operated during manufacture and including periodical inspection of the manufacturers works in accordance with the certification mark scheme of BSI designed to ensure compliance with a British Standard.BS 5058:1973 BSI 389 Chiswick High Roa
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