1、BRITISH STANDARD BS EN 12956:1999 Incorporating Amendment No. 1 Wallcoverings in roll form Determination of dimensions, straightness, spongeability and washability The European Standard EN 12956:1999, including amendment A1:2001, has the status of a British Standard ICS 91.180 BS EN 12956:1999 This
2、British Standard, having been prepared under the direction of the Consumer Products and Services Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 15 September 1999 BSI 31 July 2002 ISBN 0 580 32585 7 National foreword This Brit
3、ish Standard is the official English language version of EN 12956:1999, including amendment A1:2001. The UK participation in its preparation was entrusted to Technical Committee CW/35, Wallcoverings, which has the responsibility to: A list of organizations represented on this committee can be obtain
4、ed on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of
5、 the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. ai
6、d enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages Th
7、is document comprises a front cover, an inside front cover, the EN title page, pages 2 to 11 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 13613 31 July 2002 Revision of 6. 2
8、. 2EUROPEAN STANDARD EN 12956 NORME EUROPENNE May 1999 EUROPISCHE NORM + A1 2001 ICS 91.180 English version Wallcoverings in roll form Determination of dimensions, straightness, spongeability and washability (includes amendment A1:2001) Revtements muraux en rouleaux Dtermination des dimensions, de l
9、a rectitude, de lpongeabilit et de la lavabilit (inclut l amendment A1:2001) Wandbekleidungen in Rollen Bestimmung der Mae, Geradheit, Wasserbestndigkeit und Abwaschbarkeit (enthlt nderung A1:2001) This European Standard was approved by CEN on 18 April 1999. Amendment A1 was approved by CEN on 20 Oc
10、tober 2001. 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 lists and bibliographical references concerning such national standards may be o
11、btained 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 responsibility of a CEN member into its own language and notified to the Central S
12、ecretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CE
13、N European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart, 36 B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref. No. EN 12956:1999 + A1:200
14、1 EPage 2 EN 12956:1999 BSI 31 July 2002 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Method of measuring dimensions 3 5 Method of verifying straightness 4 6 Method of assessing spongeability and washability 5 7 Test report 10 Foreword This European Standard has been
15、 prepared by Technical Committee CEN/TC 99, Wallcoverings, 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 endorsement, at the latest by November 1999, and conflicting national standard
16、s shall be withdrawn at the latest by November 1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland,
17、 Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. This European Standard will supersede the annexes of European Standard EN 233:1989. The final edition of EN 233 will contain only specifications. Foreword to amendment A1 This amendment EN
18、12956:1999/A1:2001 to the EN 12956:1999 has been prepared by Technical Committee CEN/TC 99, Wallcoverings, the Secretariat of which is held by BSI. This amendment to the European Standard EN 12956:1999 shall be given the status of a national standard, either by publication of an identical text or by
19、 endorsement, at the latest by June 2002, and conflicting national standards shall be withdrawn at the latest by June 2002. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgi
20、um, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.Page 3 EN 12956:1999 BSI 31 July 2002 1 Scope This standard specifies: a method for measuring dimensions; a method for
21、verifying straightness; a method for assessing spongeability and washability. It is applicable to all wallcoverings in roll form, except cork wallcoverings. 2 Normative references This 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 standard only when incorporated in it by amendment or revision. For undated references the latest edition
23、 of the publication referred to applies. EN 233, Wallcoverings in roll form Specifications for finished wallpapers, wall vinyls and plastics wallcoverings. EN 235, Wallcoverings Vocabulary and symbols. prEN 259-1, Wallcoverings in roll form Heavy duty wallcoverings Part 1: Specifications. ISO 187, P
24、aper, board and pulps Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples. ISO 565, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings. ISO 1923, Cellular plastics and rubbers Det
25、ermination of linear dimensions. ISO 2439, Flexible cellular polymeric materials Determination of hardness (indentation technique). 3 Definitions For the purposes of this European Standard, the definitions given in EN 235 apply. 4 Method of measuring dimensions 4.1 Apparatus 4.1.1 Width 4.1.1.1 Suit
26、able steel rule, calibrated in millimetres accurate to 0,5 mm or any other equivalent precision device. 4.1.1.2 Rectangular template, (32 0,5) mm (300 0,5) mm for category 3 wallcoverings in accordance with EN 233.Page 4 EN 12956:1999 BSI 31 July 2002 4.1.2 Length Suitable tape calibrated in centime
27、tres accurate to 0,5 cm per 20 m or any other equivalent precision device. 4.2 Preparation Samples shall be conditioned in accordance with ISO 187. Measurements shall be made on each roll selected for sampling in accordance with the wallcovering requirements, in particular the normative annexes of E
28、N 233 and prEN 259-1. NOTE The measurement of very large rolls of heavy duty wallcoverings may be difficult to perform under the conditions of ISO 187 but should be undertaken as soon as practicable after such conditioning. 4.3 Procedures 4.3.1 Width For wallcoverings of categories 1 and 2 defined i
29、n EN 233 and for other wallcoverings in roll form, measure the width perpendicular to the length of the roll at at least three points on the roll which are at least 1 m apart. State the width as the arithmetic mean of these measurements to the nearest millimetre. For friezes (in accordance with cate
30、gory 3 defined in EN 233), place the template (see 4.1.1) on the frieze and try to inscribe it entirely within the latter. If this is possible, the width of the frieze shall be considered to be not less than 32 mm, if not, the width shall be considered to be less than 32 mm. 4.3.2 Length Measure the
31、 length on one side of the roll after ensuring that the roll ends are cut at right angles. State the length to the nearest centimetre. 5 Method of verifying straightness 5.1 Apparatus 5.1.1 Steel rule, at least 1 m long with a straightness accuracy of at least 0,04 mm over a length of 1 m. 5.1.2 Shi
32、m, 1 mm thick accurate to 0,1 mm. 5.2 Test pieces From the sample, take a test piece 2,50 m long. 5.3 Procedure Lay out the test piece over a flat surface. Make three marks 1 m apart on one edge of the test piece. Line up the rule with two of the marks. Check whether the distance between the edge of
33、 the test piece and the rule is greater than the thickness of the shim by sliding it along the rule. Repeat the operation with the third mark. If the two measurements give a distance of less than the thickness of the shim, record the result as: distance less than 1 mm. Otherwise, record the result a
34、s: distance greater than 1 mm.Page 5 EN 12956:1999 BSI 31 July 2002 6 Method of assessing spongeability and washability 6.1 Principle Secure a test piece taken from the wallcovering to a horizontal surface and, after applying a reagent, rub it mechanically. Then examine the test piece for damage. 6.
35、2 Reagents 6.2.1 Spongeability distilled or deionized water at the ambient temperature of the laboratory. 6.2.2 Washability or extra-washability solution of soft soap in distilled or deionized water with a mass fraction of 2 % at the ambient temperature of the laboratory. The soap shall be made by t
36、he reaction of potassium or sodium hydroxide with a vegetable oil or oils or with fatty acids derived from them yielding not less than 32 % of fatty acids. The soap shall be jelly-like in texture. 6.2.3 Scrubbability abrasive paste comprising 75 % by mass of a white aluminium oxide abrasive powder w
37、ith particle size as given in Table 1 1)and 25 % of soap solution (6.2.2). Table 1 Particle sizing Nominal aperture size of sieve, m(in accordance with ISO 565) Percentage retained (by mass) 125 nil 90 0 to 15 63 40 53 65 6.3 Apparatus 6.3.1 Base machine (see Figure 1) The base machine shall include
38、 the following characteristics.a) A flat glass platen mounted in the horizontal plane with a framework for clamping on a 300 mm long 150 mm wide test piece of wallcovering, retaining the reagent placed on the test piece and preventing the ingress of reagent under the test piece.b) A motor-driven arm
39、 on which a rubbing head, with its bottom face resting on the platen, is pivoted. The machine has an automatic stop mechanism which can be pre-set to stop the arm on completion of the required number of cycles.c) The arm reciprocates the rubbing head on a straight course along the length of the test
40、 piece with sinusoidal displacement against time. The length of the stroke shall be (140 1) mm and the arm shall capable of being set to reciprocate at two speeds (30 3) cycles/min or (120 10) cycles/min.d) The rubbing head is attached to the arm by a parallelogram linkage to allow free vertical mov
41、ement of the head whilst maintaining its working surface in a horizontal plane.1)The sieving specification is termed Grit No. 180 by the Federation of European Producers of Abrasives.Page 6 EN 12956:1999 BSI 31 July 2002 Legend 1 Rubbing head 2 Reciprocating arm and pivot 3 Parallelogram linkage 4 R
42、ubbing material end clamped to bottom face of rubbing head 5 Framework 6 Test piece 7P l a t e n Figure 1 Diagram illustrating the mechanism of the spongeability and washability test apparatusPage 7 EN 12956:1999 BSI 31 July 2002 6.3.2 Rubbing heads The following rubbing heads are requireda) For spo
43、ngeability: A head with a bottom face 50 mm long and 29 mm wide to which a sponge is secured by end clamps. The total mass of the head with the dry sponge attached, two of the four arms of the parallelogram and their attachment systems to the head shall be (100 5) g (see Figure 1). The sponge is cut
44、 from polyether foam open cell irregular structure sheet of apparent density (22 1) kg/m 3 , of hardness (20,5 2,5) N when measured in accordance with ISO 2439, method C, in an atmosphere of (20 2) C and (65 5) % relative humidity and of thickness 6 0 32 , mm in accordance with ISO 1923. The sponge
45、is (29 1) mm wide and of a length sufficient to be laid along the 50 mm length of the bottom face of the head and secured by clamps. b) For washability and extra-washability: A head with a bottom face 50 mm long and 29 mm wide to which a strip of felt is secured by end clamps. The total mass of the
46、head with the dry felt attached, two of the four arms of the parallelogram and their attachment systems shall be (550 10) g (see Figure 1). The strip of felt is cut from white packaging felt sheet with a composition of at least 97 % wool fibre quality 60s, a density of 180 g/dm 3 15 %, a thickness o
47、f 6 mm 20 % and the following chemical grade of purity: pH value of aqueous extract: 5 to 8; chlorine content, calculated as NaCl: 0,05 % max.; sulfate content, calculated as Na 2 SO 4 : 0,25 % max.; amount of matter soluble in toluene/methanol (other than matter derived from proofing agents): 5,0 %
48、 max.; amount of matter soluble in water after removal of matter soluble in toluene/methanol: 3,0 % max.; ash (other than the ash of proofing agents): 3,5 % max. The strips shall be (29 1) mm wide and of length sufficient to be laid along the 50 cm length of the bottom face of the head and secured b
49、y the clamps. c) For scrubbability: A head with a brush secured to the bottom face. The total mass of the head with the brush attached which bears on the test piece shall be (600 10) g (see Figure 2). The brush has polyamide 6.6 bristles (0,33 0,025) mm in diameter arranged in 55 tufts each of (23 2) bristles and (12 1) mm long (see details in Figure 3). NOTE When not in use,
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