1、BRITISH STANDARD BS EN 995:1996 Textile floor coverings Assessment of the creep of the backings The European Standard EN 995:1995 has the status of a British Standard ICS 59.080.60BSEN995:1996 This British Standard, having been prepared under the directionof the Sector Board forMaterials and Chemica
2、ls, waspublished under the authorityof the Standards Boardand comes into effect on 15 March 1996 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference TCI/3 Draft for comment 93/301513 DC ISBN 0 580 24786 4 Committees responsible for this British Standard
3、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 Manufacturers Association Ltd. British Polyolefin Textiles Association British Shops and
4、 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 Carpet Manufacturers Association Health Care Supplies South West Institute of Trading S
5、tandards Administration International Wool Secretariat Coopted members Amendments issued since publication Amd. No. Date CommentsBSEN995:1996 BSI 11-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Appar
6、atus 3 5 Sampling and preparation of test specimens 3 6 Conditioning 3 7 Test method 3 8 Calculation and expression of results 3 9 Test report 3 National annex NA (informative) Investigation of factors related to creep 4 List of references Inside back coverBSEN995:1996 ii BSI 11-1999 National forewo
7、rd This British Standard has been prepared by Technical Committee TCI/3 and is the English language version of EN995:1995 Textile floor coverings Assessment of the creep of the backings, published by the European Committee for Standardization (CEN). When prEN 995 was at the prEN formal vote stage th
8、e UK voted against it because it considers that, as the test is not fully proven, the accuracy of the test as it stands should be pointed out and the limitations of the test method should be explained (seeNational annex NA). Although the UK voted against this standard, the overall formal vote was po
9、sitive so the UK is obliged to implement it as a BS EN in accordance with the UKs obligations as a CEN member. No British Standard will be superseded as a result of publication of this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of Briti
10、sh Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard EN 20139:1992 BS EN 20139:1992 Textiles. Standard atmospheres for conditio
11、ning and testing ISO 1957:1986 BS 4664:1985 Methods for sampling and cutting specimens of textile floor coverings for physical tests Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2to4, an inside back cover and a back cover. This s
12、tandard 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.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 995 July 1995 ICS 59.080.60 Descriptors: Textiles, floor coverings, textile floor cover
13、ings, furniture, crushing tests, static loads, creep strength, thickness measurements, atmospheres English version Textile floor coverings Assessment of the creep of the backings Revtements de sol textiles Evaluation du fluage des sous couches Textile Bodenbelge Bestimmung der Verformbarkeit von Rck
14、enbeschichtungen (“Kalter Flu”) This European Standard was approved by CEN on 1995-04-27. CEN members are bound 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 li
15、sts and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the resp
16、onsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norwa
17、y, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means
18、 reserved in all countries to CEN and its members Ref. No. EN 995:1995 EEN995:1995 BSI 11-1999 2 Foreword This European Standard has been prepared by the Technical Committee CEN/TC134, Resilient and textile floor coverings, of which the secretariat is held by BSI. This European Standard shall be giv
19、en the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January1996, and conflicting national standards shall be withdrawn at the latest by January1996. According to the CEN/CENELEC Internal Regulations, the following countries are bound t
20、o implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN995:1995 BSI 11-1999 3 1 Scope This European Standard specifies a method for determinin
21、g indentation after prolonged application of a very high static load in order to assess the risks of creep of some textile floor covering backings. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references
22、 are cited at the appropriate places in the text and the publications are listed hereafter. 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 lates
23、t edition of the publication referred to applies. EN 20139:1992, Textiles Standard atmospheres for conditioning and testing. (ISO 139:1973) ISO 1957:1986, Machine-made textile floor coverings Sampling and cutting specimens for physical tests. 3 Principle The test specimen is subjected to the prolong
24、ed action of a very high static load under defined temperature conditions; the indentation under application of the load is measured. 4 Apparatus 4.1 Static loading apparatus, fitted with a thickness measuring device which can be used to take measurements to0,1mm accuracy and to apply a pressure of2
25、000KPa on a circular presser foot with a surface area of500mm 2diameter(25,24 0,10)mm. 4.2 Ventilated chamber, which can be brought to a temperature of40 C 2 C and large enough to be able to accommodate the static loading apparatus(4.1). 5 Sampling and preparation of test specimens Take at least thr
26、ee test specimens, each measuring100mm 100mm in accordance with ISO1957. 6 Conditioning Condition the prepared test specimens in the standard atmosphere for testing textiles as defined in EN20139for at least24h. 7 Test method With the apparatus in the chamber set at40 C 2 C, arrange the test specime
27、n with its use surface uppermost under the static loading apparatus so that the presser foot is at the centre of the test specimen and apply the specified pressure of (2000 10)KPa. Leave the assembly as it is and measure the indentations after (60 2) min and24h 0,4%. Note the indentations E 1and E 2
28、after1h and24h for each test specimen. 8 Calculation and expression of results Calculate, for each test specimen, E= E 2 E 1 . For all the test specimens, calculate the arithmetic mean of Efor all the test specimens. Express the creep by the result obtained Em,in millimetres, to one decimal place. 9
29、 Test report The test report shall include the following information: a) reference to this standard, i.e.EN995; b) full identification of the product tested, including the type, origin, manufacturers reference numbers; c) details of the sample; d) the individual values (E 1 , E 2 , E ) for each test
30、 specimen; e) the creep Em ; f) the appearance of the imprint on the two faces of the test specimen (extent of the fold, where applicable); g) any deviation from this standard which is likely to have affected the results.BSEN995:1996 BSI 11-1999 4 National annex NA (informative) Investigation of fac
31、tors related to creep NA.1 Technical evidence The following technical evidence indicates that the results obtained from the test method are unrelated to those factors which occur as a result of creep of tile backing in an installation. Following the determination of creep, % E(designated Emin the EN
32、 text), on six qualities of carpet tile (AtoF) as part of an inter-laboratory comparison, a further exercise was carried out to compare %E with parameters which would be relevant in use. It was felt that in a “use” situation, the creep-related factors of greatest importance to the user would be: a)
33、depth of indentation following a suitable period of recovery; b) height of any rim or protrusion on the back of the tile; c) diameter of any rim on the back of the tile, since this would be related to lateral flow of tile backing material leading to possible adhesion between adjacent tiles; d) any v
34、isual effects on the face of the tile. The following were measured and tabulated alongside %E: The following correlation coefficients were ascertained: NA.2 Conclusions NA.2.1 The low level loop tufted products showed least indentation after a period of recovery. The hair and velour products showed
35、a more noticeable imprint. The visual effect did not have any obvious relationship with %E. NA.2.2 Rather surprisingly, the %E parameter appears to have a poor correlation with I F , H Rand D R , the measurable factors which would be important in a “use” situation. Moreover, the correlation is negat
36、ive. The sample giving the greatest %E showed the lowest indentation after a period of recovery. This appears to be purely a function of the choice of carpet types used in the investigation. NA.2.3 The creep test described in EN995 gives results which appear to be largely unrelated to those factors
37、which occur as a result of creep of tile backing in an installation. I F depth of indentation on face, measured at least 7 days after removal from the creep test (in mm); H R height of rim on back measured after 7 days (in mm); D R diameter of rim on back (in mm). Sample %E I F H R D R mm mm mm mm A
38、 0.8 0.74 0.98 25 B 0.63 3.88 1.70 38 C 0.68 4.29 0.70 a D 0.63 5.80 1.57 30 E 0.45 3.78 1.58 45 F 0.54 5.01 1.15 33 Key A, F B, C D E low level loop; hair tile; needled velour; hobnail pattern needled. a Too shallow for reliable measurement. I Fwith %E: 0.58 H Rwith %E: 0.51 D Rwith %E: 0.22BSEN995
39、:1996 BSI 11-1999 List of references See national foreword.BS EN 995:1996 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 international l
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