1、BRITISH STANDARD BS 5921:1980 Incorporating Amendment No.1 Methods for Determination of size, squareness and straightness of edge of textile floor covering tiles UDC 677.07:645.12:677.017.22:531.717.85BS5921:1980 This British Standard, having been prepared under the directionof the Fibres, Yarns and
2、Fabrics Standards Committee, was published underthe authority of the Executive Board and comes intoeffect on 31 July 1980 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference FBT/16 Draft for comment 78/35579 DC ISBN 0 580 11476 7 Cooperating organization
3、s The Fibres, Yarns and Fabrics Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Association of Jute Spinners and Manufacturers British Man-made Fibres Fed
4、eration* British Nonwovens Manufacturers Association British Railways Board* British Textile Employers Association* Central Council of the Irish Linen Industry Consumer Standards Advisory Committee of BSI Department of Industry (Chemicals and Textiles) International Wool Secretariat* Knitting Indust
5、ries Federation Ltd.* Manchester Chamber of Commerce and Industry* Ministry of Defence* Narrow Fabrics Federation Retail Trading-Standards Association Inc.* Textile Institute* Warp Knitters Association Ltd. The organizations marked with an asterisk in the above list, together with the following, wer
6、e directly represented on the committees entrusted with the preparation of this British Standard: Agrment Board Bradford Conditioning House British Carpet Manufacturers Association British Polyolefin Textiles Association Department of the Environment (PSA) European Flooring Institute Fibre Bonded Ca
7、rpet Manufacturers Association Quality Control Services Ltd. Soap and Detergent Industry Association Society of Dyers and Colourists Society of Motor Manufacturers and Traders Limited Textile Research Council Wool Textile Delegation Amendments issued since publication Amd. No. Date of issue Comments
8、 3501 January1981 Indicated by a sideline in the marginBS5921:1980 BSI 09-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Principle 1 4 Apparatus 1 5 Atmosphere for conditioning and testing 1 6 Test specimens 1 7 Procedure 1 8 Test report 2 Ap
9、pendixAShapes of tiles 3 Figure1Marking of specimens 1 Figure2Distances measured 2 Publications referred to Inside back coverBS5921:1980 ii BSI 09-1999 Foreword This British Standard was prepared under the direction of the Fibres, Yarns and Fabrics Standards Committee. It specifies a method for dete
10、rmining size and squareness of textile floor covering tiles using the apparatus described in BS5920, and a method for determining straightness of edge using feeler gauges. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are respon
11、sible 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, pagesi andii, pages1 to4, an inside back cover and a back cover. This standard has been up
12、dated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5921:1980 BSI 09-1999 1 1 Scope This British Standard specifies methods for the determination of size, squareness and straightness of edge of textile floor c
13、overing tiles, and is applicable to tiles of all types of construction, maximum thickness 15mm, and for all methods of installation, e.g. loose laid or adhered. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Principle Dimensions of the
14、 tiles are measured using micrometer gauges, and straightness of edge determined using feeler gauges. 4 Apparatus The following apparatus is required. 4.1 Apparatus, specified in BS 5920 for the determination of dimensions of textile floor covering test specimens. 4.2 Feeler gauges, of 5mm width in
15、the range0.2mmto2.0mm. 5 Atmosphere for conditioning and testing The conditioning and testing atmosphere shall be the standard atmosphere for testing textiles defined in BS1051, i.e. an atmosphere of relative humidity65 2 % and a temperature of 20 2 C. 6 Test specimens A single, whole tile is regard
16、ed as one test specimen. Sampling and number of specimens shall be as agreed between the parties involved in the test. Specimens shall be allowed to condition laid flat singly, use surface uppermost, in the standard atmosphere for testing textiles as defined in clause5. They shall be kept in this at
17、mosphere firstly for at least 24h, and then either to constant mass or for a further period of 48h. Wherever possible, the direction of manufacture shall be identified. All measurements shall be made with reference to this, and the sides shall be marked A, B, C, D, as shown in Figure 1. If the direc
18、tion of manufacture cannot be identified, an arbitrary identification of direction and related sides shall be made. 7 Procedure 7.1 Size and squareness 7.1.1 With the dial gauge presser foot shafts in their maximum positions, place the appropriate calibration square or T-square on the baseboard and
19、ensure that it is in contact with the stop bars. Release the dial gauge shafts and obtain a zero reading for each micrometer. Re-lock the dial gauge shafts in their maximum positions and remove the calibration square. 7.1.2 Place the specimen, reverse side uppermost, on the apparatus, with side A fi
20、rmly against the top stop bar and at least part of side D in contact with the side stop bar (position1), taking particular care where direction of pile might cause springing back. Place the appropriately sized flat plate centrally on top of the specimen, ensuring that the specimen remains flat and i
21、n position, allow the feet of all four gauges to rest against the edges of the specimen, and record the readings x 1 , x 2 , y 1and y 2to the nearest0.1mm (seeFigure 2). By reference to the calibration, and by the appropriate addition or subtraction of the zero readings, calculate the two values for
22、 dimensions in the direction of manufacture (Y 1and Y 2) and the two values for dimensions at right angles to this (X 1and X 2 ). Figure 1 Marking of specimensBS5921:1980 2 BSI 09-1999 7.1.3 Remove the flat plate and re-position the specimen so that side D is firmly against the side stop bar and at
23、least part of side A is in contact with the top stop bar (position 2). (No re-positioning will be required if sides A and D are precisely at right angles to each other.) Replace the flat plate and again carry out the measurements as described in7.1.2, recording the readings x 1 , x 2 , y 1 and y 2 t
24、o the nearest0.1mm and calculating the values for the dimensions X 1 , X 2 , Y 1 and Y 2 as before. 7.1.4 Record the eight values for dimensions obtained, four in the direction of manufacture and four at right angles to this, and use the relationships between the values to describe the shape of the
25、specimen, in accordance with the procedure described in Appendix A . 7.2 Edge straightness 7.2.1 With the specimen in position 1 (see7.1.2), measure any gaps between the top stop bar and side A by using the largest feeler gauge that can be inserted. Repeat this procedure for gaps between the side st
26、op bar and side D with the specimen in position 2 (see7.1.3), each time with the flat plate in position. 7.2.2 Remove the flat plate and rotate the specimen through 180 so that side C is adjacent to the top stop bar and side B adjacent to the side stop bar, and repeat the procedures in7.2.1 using th
27、e equivalent positions, i.e. to determine the gaps between sidesC and sides B and the appropriate stop bars respectively. 7.2.3 If possible, draw a sketch illustrating the positions of any unevenness found. 8 Test report The report shall include the following information: a) that the test was perfor
28、med in accordance with this British Standard; b) the way in which the specimens were conditioned; c) the number of specimens tested, and for each specimen: 1) the eight values for dimensions from 7.1.4, 2) a sketch or description of the specimen shape, 3) the size of the largest feeler gauge that co
29、uld be inserted for each of the four sides tested, 4) a sketch illustrating the unevenness of each edge, if any; d) details of any deviations from the standard test procedure. Figure 2 Distances measuredBS5921:1980 BSI 09-1999 3 Appendix A Shapes of tiles This appendix provides examples of possible
30、tile shapes, together with the relationships between the associated measurements taken as described in7.1.2 and7.1.3. NOTEThe information provided by these relationships should be used with caution, particularly in view of the fact that localized waviness on an edge near a corner could lead to disto
31、rtion of the results. A.1 Square A.2 Rectangular A.3 Rhombic A.4 Trapezoidal A.5 Trapezoidal with two right angles A.6 Irregularly quadrilateral4 blankBS5921:1980 BSI 09-1999 Publications referred to BS 1051, Glossary of terms relating to the conditioning and testing of textiles. BS 5920, Method for
32、 determination of dimensions of textile floor covering test specimens. BS5921:1980 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the intern
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