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1、BRITISH STANDARD BS EN 985:1995 Textile floor coverings Castor chair test The European Standard EN 985:1995 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 05:39:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 985:1995 This British Standard, having bee
2、n prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 November 1995 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference TCI/3 Draft for comment
3、 93/300493 DC ISBN 0 580 24201 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee TCI/3, Textile floor coverings, upon which the following bodies were represented: Association of Consulting Scientists British Carpet Manufa
4、cturers Association Ltd. British Polyolefin Textiles Association British Shops and Stores Association (BSSA) British Textile Confederation British Textile Technology Group Confederation of British Wool Textiles Limited Consumer Policy Committee of BSI Contract Flooring Association Fibre Bonded Carpe
5、t Manufacturers Association Health Care Supplies South West Institute of Trading Standards Administration International Wool Secretariat Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 05:39:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
6、 BS EN 985:1995 BSI 08-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 9853 National annex NA (informative) Limitations of the test methodInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 05:39:46 GMT+00:00 2006, Uncontroll
7、ed Copy, (c) BSI BS EN 985:1995 ii BSI 08-1999 National foreword This British Standard has been prepared by Technical Committee TCI/3 and is the English language version of EN 985:1994 Textile floor coverings Castor chair test, published by the European Committee for Standardization (CEN). When EN 9
8、85 was at the prEN Formal Vote stage, the UK voted against it because it considers that, since the test method is not fully proven the precision and accuracy of the test as it stands should be pointed out and the limitations of the method should be explained. The test is widely used in a number of c
9、ountries but suffers from limitations shown by the work of ISO/TC38/SC12. These limitations relate to accuracy (relationship to real life), precision (reproducibility) and some aspects of the test technology (see National annex NA). The test is however called up by other standards and if used in ful
10、l knowledge of its limitations it fulfils a useful purpose. 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 immunity from
11、legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 8, 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 indicat
12、ed in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 05:39:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 985 December 1994 ICS 59.080.60; 91.180 Descriptors: Textiles, floor coverings, textile
13、 floor coverings, wear tests, determination, wear, test equipment, castors English version Textile floor coverings Castor chair test Revtements de sol textiles Essai lappareil roulettes Textile Bodenbelge Stuhlrollenprfung This European Standard was approved by CEN on 1994-11-15. CEN members are bou
14、nd to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on applications to the
15、Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status
16、as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit
17、Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN 985:1994 E Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 05:39:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 985:1994 BSI 08
18、-1999 2 Foreword This European Standard has been prepared by the Technical Committee CEN/TC 134, Resilient and textile floor coverings, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by e
19、ndorsement, at the latest by June 1995, and conflicting national standards shall be withdrawn at the latest by June 1995. In accordance with the CEN/CENELEC Internal Reuglations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, German
20、y, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Principle3 4Test apparatus3 5Sampling5 6Conditioning5 7Procedure5 8Assessment6 9Calculations and expression of results7 1
21、0Test report7 Figure 1 Castor chair apparatus4 Figure 2 Details of castors5 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 05:39:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 985:1994 BSI 08-19993 1 Scope This European Standard specifies three methods for assessing the wear behaviour of t
22、extile floor coverings under the movement of a castor chair. 2 Normative references This European Standard incorporates by dated or undated references, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed herea
23、fter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. prEN 1471, Textile floor coverings A
24、ssessment of changes in appearance. EN 20139, Textiles Standard atmospheres for conditioning and testing. (ISO 139:1973) ISO 1957, Machine-made textile floor coverings Sampling and cutting specimens for physical tests. 3 Principle A textile floor covering is submitted for a prescribed number of cycl
25、es to the action of three castors which produce an eccentric turning motion. At the end of each test: the change in appearance in accordance with prEN 1471 is assessed after 5 000 cycles and 25 000 cycles (Test A); the change in colour by means of grey scales is assessed after 750 cycles (Test B); t
26、he extent of deterioration of the specimen is assessed after 10 000 or 25 000 cycles (Test C). 4 Test apparatus 4.1 Test apparatus fitted with castors, with the following specifications (see Figure 1) 4.1.1 A rotating circular test platform (P), on which the test specimens are placed. The diameter o
27、f the platform is 800 mm 5 mm. 4.1.2 A castor assembly (R), comprising a vertical shaft, set in a bearing and a plate on which the castors are mounted. This castor assembly is offset at a distance of 198 mm 1 mm from the centre of the rotating test platform. The three castors are each arranged conce
28、ntrically at 120 intervals around the centre of the plate at a distance of 130 mm 1 mm from the centre of the plate and are free to rotate, so that they follow the rotation of the castor assembly. The stressed area is determined by the distance between the axes of revolution of the castor chair asse
29、mbly and the specimen table and by the distance of the castors from the centre of the plate. This area is approximately 0,3 m2. The apparatus is provided with a lifting device to raise the castor assembly above the testing platform when the apparatus is stopped. The castor assembly is loaded with a
30、mass M, 90 kg 1 kg equally divided over the three castors. The distance (under load) between castor mounting plate (R) and load/drive plate (C) shall be more than 3 mm (see Figure 1). 4.1.3 Drive mechanism The drive to the specimen plate and to the castor assembly is interlocked and fitted with a re
31、versing mechanism. The number of revolutions is set by means of a pre-set counter. The rotation speed of the rotating platform shall be (19 1) min1 and that of the castor assembly (50 1) min1. The direction of rotation of the rotating platform shall reverse after approximately 3 min. The time in the
32、 stop position is about (5 1) s. The relationship between the rotation speed of the specimen table and that of the castor assembly causes a sharp reverse movement of the castors within the stressed area. 4.1.4 Suction device (A) A suction device is mounted over the entire width of the stressed area,
33、 the height of this device being adjustable. The suction capacity is between 25 l/s to 30 l/s. Test A:Assessment of the wear behaviour of textile floor covering under the castor chair, Test B:Assessment of the change in colour (glossing) of flat needled floor coverings, Test C:Assessment of the gene
34、ral structural integrity of textile floor coverings. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 05:39:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 985:1994 4 BSI 08-1999 Figure 1 Castor chair apparatus Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 05:39:46 GMT+00:00 2006, Un
35、controlled Copy, (c) BSI EN 985:1994 BSI 08-19995 4.1.5 Castors The castors shall have the following dimensions (see Figure 2). The distance between any two castor mountings is 225 mm. The castors treads are made of polyamide having a Shore A hardness between 90 and 100. After about 2 000 000 revolu
36、tions of the test platform, replace the castors, or earlier if necessary. 4.1.6 Specimen support A circular sheet of rigid plastic (e.g. polymethylmethacrylate), 8 mm thickness and with a diameter of 800 mm, on which the specimen(s) is placed. The support itself shall be laid on the test platform wi
37、th holes in the support locating on studs on the turntable to prevent slippage. 4.1.7 Metal ring (optional) A metal ring 10 mm in height and 700 mm in diameter can be used to hold loose laid tiles in position during the test. 4.2 Brush vacuum cleaner Use a vacuum cleaner with rotating brush driven b
38、y an independent motor. 4.3 Large dimension grey-scale range, including the half degrees, in accordance with prEN 1471. 5 Sampling Take the specimens from the sample, in accordance with ISO 1957. Cut either 3 semi-circles or 6 quadrants of radius about 350 mm. The quadrant edges shall be parallel to
39、 or at right angles to the direction of manufacture. Cut also a reference specimen of 200 mm 200 mm. In all cases mark the direction of manufacture. Attach two half circles or four quadrant specimens to the support over their whole area with double-sided adhesive, for example, ensuring that there ar
40、e no gaps between the test specimens. 6 Conditioning Condition the test specimens in the standard atmosphere for testing defined in EN 20139 for a minimum of 24 h. 7 Procedure The tests are performed in the standard atmosphere for textiles. 7.1 Mounting of the specimens Place the specimen support wi
41、th attached specimens onto the test platform ensuring that the holes in the specimen support engage the studs in the turntable. diameter50 mm 2 mm width20 mm radius of curvature of castor tread 100 mm crank distance32 mm Figure 2 Details of castors Licensed Copy: sheffieldun sheffieldun, na, Tue Nov
42、 07 05:39:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 985:1994 6 BSI 08-1999 7.2 Verification of the castors Check that the castors rotate freely and remove any remains of fibres which may be trapped therein, for example with compressed air. 7.3 Setting the apparatus Lower the castors slowly un
43、til they come into contact with the specimens and until the wheel becomes idle. Place the suction device as close as possible to the specimen but without touching it. Start the vacuum cleaner and leave it to operate throughout the whole of the test. 7.4 Test A-Assessment of the wear behaviour of tex
44、tile floor coverings under the castor chair 7.4.1 Test procedure Stage 1 Set the counter at 5 000 cycles and start the machine. After the platform has rotated for 5 000 revolutions, the machine stops; then remove half of the test specimen for the short term evaluation and leave the other half for st
45、age 2 of the test. Brush vacuum the fatigued specimen (5 000 cycles) immediately after removal from the castor chair test device. Brush them four times in both directions with the brush vacuum cleaner using a slow movement and ending in the direction of the pile. Condition the specimen in the standa
46、rd atmosphere for at least 24 h, laying the specimen flat with the use surface uppermost or hanging them freely. 7.4.2 Test procedure Stage 2 Place unworn specimens of the same textile floor covering or of an equivalent textile floor covering on the test platform to replace the half removed for the
47、stage 1 test. Set the counter at 20 000 cycles and start the machine. When the apparatus stops, remove the specimens which have been mounted since the beginning of stage 1. These have therefore been subjected to 25 000 cycles. Brush them as done at the end of the stage 1 test. 7.5 Test B Assessment
48、of the change in colour (glossing) of flat needled floor coverings Set the counter at 750 cycles and start the apparatus. As soon as the apparatus stops, remove the specimens and condition them in the standard atmosphere for textiles for a minimum of 24 h. 7.6 Test C Assessment of the general struct
49、ural integrity Set the counter at 10 000 or 25 000 cycles as indicated in the specifications, and start the apparatus. Examine the test specimens periodically during the course of the test and after the number of rotational cycles indicated in the specifications. Note the emergence and extent of signs of deterioration. 8 Assessment 8.1 Test A Place, side by side and in the same reference direction, the fatigued specimens and the reference specimen and carry out the assessment in accordance with p