1、April 2012 Translation by DIN-Sprachendienst.English price group 8No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 9
2、7.150!$C;“1883224www.din.deDDIN EN ISO 24344Resilient floor coverings Determination of flexibility and deflection (ISO 24344:2008)English translation of DIN EN ISO 24344:2012-04Elastische Bodenbelge Bestimmung der Flexibilitt und Durchbiegung (ISO 24344:2008)Englische bersetzung von DIN EN ISO 24344
3、:2012-04Revtements de sol rsilients Dtermination de la flexibilit et de la dformation (ISO 24344:2008)Traduction anglaise de DIN EN ISO 24344:2012-04SupersedesDIN EN 435:1994-11www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1103.1
4、2 DIN EN ISO 24344:2012-04 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee ISO/TC 219 “Floor coverings” (Secretariat: KATS, Korea) of the International Organization for Standardization (ISO) and has been taken over as EN ISO 24344:201
5、2 by Technical Committee CEN/TC 134 “Resilient, textile and laminate floor coverings”, (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was the Normenausschuss Kunststoffe (Plastics Standards Committee), Working Committee NA 054-04-05 AA Bodenbelge. Amendme
6、nts This standard differs from DIN EN 435:1994-11 as follows: a) in Clause 1 “Scope” the term “flexibility” has been replaced with “flexibility and deflection”; b) Methods A and B have been revised; c) Clause 8 “Expression of results for both methods” has been extended; d) Clause 9 “Test report” has
7、 been extended; e) Clause 10 “Precision and bias statement” has been included; f) the standard has been editorially revised. Previous editions DIN EN 435: 1994-11 DIN 51949: 1975-06 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 24344 February 2012 ICS 97.150 Supersedes EN 435:1994English
8、Version Resilient floor coverings - Determination of flexibility and deflection (ISO 24344:2008) Revtements de sol rsilients - Dtermination de la flexibilit et de la dformation (ISO 24344:2008) Elastische Bodenbelge - Bestimmung der Flexibilitt und Durchbiegung (ISO 24344:2008) This European Standar
9、d was approved by CEN on 24 December 2011. 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 s
10、uch national standards may be obtained on application to the CEN-CENELEC Management Centre 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 o
11、wn language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Ita
12、ly, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 1
13、7, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 24344:2012: EContents EN ISO 24344:2012 (E) DIN EN ISO 24344:2012-04 2 Page Foreword 3 1 Scope 4 2 Terms and definitions .4 3 Principle 4 4 Apparatus .4 5
14、Sampling and selection of specimens for both methods 6 6 Atmosphere for conditioning and testing .6 7 Test procedure .6 8 Expression of results for both methods .7 9 Test report 8 10 Precision and bias statement .8 Bibliography 9 Foreword The text of ISO 24344:2008 has been prepared by Technical Com
15、mittee ISO/TC 219 “Floor coverings” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 24344:2012 by Technical Committee CEN/TC 134 “Resilient, textile and laminate floor coverings” the secretariat of which is held by BSI. This European Standard shall be gi
16、ven the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2012, and conflicting national standards shall be withdrawn at the latest by August 2012. Attention is drawn to the possibility that some of the elements of this document may
17、be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 435:1994. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to imple
18、ment this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Swi
19、tzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 24344:2008 has been approved by CEN as a EN ISO 24344:2012 without any modification. EN ISO 24344:2012 (E) DIN EN ISO 24344:2012-04 3 1 Scope This International Standard specifies methods for determining the flexibility and
20、deflection of resilient floor coverings. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 flexibility ability of a resilient floor covering to be bent without breaking or cracking 3 Principle 3.1 Method A (for determining flexibility) The test
21、 piece shall be bent 180 around a mandrel under specified conditions. 3.2 Method B (for determining deflection) The test piece is deformed with a cylinder with a radius of curvature much greater than the test piece thickness by a force centred between two fixed supports. 4 Apparatus 4.1 Method A 4.1
22、.1 Fixed metal mandrels, with nominal diameters ( 0,05 mm) as follows: 120, 110, 100, 90, 80, 70, 60, 55, 50, 45, 40, 35, 30, 25, 20, 15, 10, 7 mm (see Figure 1). The contacting faces of the rods shall be a minimum of 60 mm in length. 4.1.2 Stand or other device, to firmly support the mandrel in a h
23、orizontal position during the test. 4.1.3 Die or knife or similar, to prepare test specimens with uniform smooth edges. EN ISO 24344:2012 (E) DIN EN ISO 24344:2012-04 4 Key 1 mandrel 2 support Figure 1 Mandrel 4.2 Method B 4.2.1 Test piece stand (deflection frame), as shown in Figures 2 and 3, compr
24、ising two metal cylinders, of diameter 8 mm and minimum length 60 mm, with a distance of 150 5 mm between the two axes of the cylinders. 4.2.2 Tensile test apparatus, capable of holding the test piece stand. 4.2.3 Parallel bar with a radius of 4 mm, centred between the two cylinders, which can be di
25、splaced in the vertical plane of symmetry of the stand at a speed of (100 5) mm/min and a movement of at least 65 mm at a load of 4,5 kg. 4.2.4 Cutting device, for cutting the samples to 50 mm 250 mm. 4.2.5 Water bath, capable of maintaining a temperature of (25 0,5) C. Dimensions in millimetres Key
26、 1 steel bar radius, r = 4 mm 2 load 3 specimen 4 steel bar, r = 4 mm 5 dial gauge 6 loading bar Figure 2 First example of deflection frame EN ISO 24344:2012 (E) DIN EN ISO 24344:2012-04 5 Dimensions in millimetres Key 1 deflection, mm Figure 3 Second example of deflection frame 5 Sampling and selec
27、tion of specimens for both methods Take a representative sample from the material to be tested. Take six specimens from each sample, each measuring 250 mm 50 mm, at equal distances from each other. The distance between the outer edge of the test specimen being at least 100 mm. Take three specimens i
28、n the direction of manufacture and three in the transverse direction. Prepare the specimen by means of a die, knife, or other similar instrument, so as to produce uniform smooth edges. Specimens with nicked or fractured edges should not be tested. If necessary, place the sample in an oven at 30 C fo
29、r 15 min before cutting the test pieces. Ensure that the edges of the test pieces are clean-cut without notches. 6 Atmosphere for conditioning and testing 6.1 Method A Condition the test pieces and mandrels at a temperature of (23 2) C and (50 5) % relative humidity for 24 h and perform the test in
30、the same environment. Specimens shall be flat and conditioned on a flat surface not leaving any curvature. 6.2 Method B Store the test pieces in a water bath at 25 C 0,5 C for a minimum of 3 h before testing. 7 Test procedure 7.1 Method A 7.1.1 Place the test piece over a mandrel with the wearing su
31、rface facing out and with the major axis of the specimen perpendicular to the major axis of the mandrel. 7.1.2 Holding the specimen at each end, bend the material around the mandrel through an angle of 180 at a uniform rate within 3 s to 5 s to complete the bend. Maintain a good contact between the
32、specimen and mandrel. 7.1.3 At the completion of the bending operation, examine the specimen face visually in the bent position for breaks, cracks, or other damage. When required by the detailed specification, straighten the specimen at the same rate at which it was bent, and examine the back for th
33、e same faults. EN ISO 24344:2012 (E) DIN EN ISO 24344:2012-04 6 If the machine direction cannot be determined by the appearance of the material, three specimens shall be cut parallel to one edge of the material and three shall be cut perpendicular to that edge. Report that the machine direction coul
34、d not be determined. 7.1.4 Repeat the steps in 7.1.1 to 7.1.3, with the specimen face inside against the mandrel. Examine the back visually, while the specimen is still in the bent position, for cracks, breaks, or other damage. Then straighten the specimen and examine the wearing surface. Use fresh
35、specimens for the part of the test with the specimen face inward. 7.2 Method B 7.2.1 Ensure that the deflection speed of the tensile test apparatus is 100 5 mm/min. 7.2.2 Centre the test piece in the frame. 7.2.3 Ensure that the three bars are parallel and that the centre-bar is accurately centred b
36、etween the two outside bars. Position the frame so that the test sample can be placed with the wearing surface touching the centre-bar, and the back surface touching the two other bars, without deflection of the sample. This is the zero point for measuring deflection. 7.2.4 Ensure that the deflectio
37、n-measuring device accurately measures the relative movement between the centre-bar and the frame holding the two outer bars. 7.2.5 Start the machine and record the deflection at the point where the sample breaks, or pulls free from the outer bars. Record the deflection to the nearest 1,0 mm. Remove
38、 the sample from the apparatus, and return the deflection frame to the zero point described in 7.2.3. Repeat the process described above on the next test piece and start testing it. NOTE If a pendulum weighing system is used on the test machine, which has appreciable movement of the attached jaw, th
39、e mechanism can be locked in place to make measurement of the deflection easier, and maintain the specified deflection rate, since measurement of the load is not required. Electronic load cell machines usually have negligible movement. 8 Expression of results for both methods Report the results of t
40、he tests as cracking or not cracking, ignoring any effects within 10 mm of the edges of the test piece. 8.1 Method A When the material is required to pass a specified mandrel, report the passing or failing of each test piece relative to this mandrel. The pass criteria is that neither the face nor th
41、e back may exhibit breaks, cracks, or other permanent damage (a different size mandrel may be specified for the machine- and cross-machine direction). If no mandrel diameter is specified, report the smallest mandrel around which the material may be bent without showing breaks, cracks or other perman
42、ent damage. 8.2 Method B Record the maximum deflection on the dial gauge at break for each test piece. EN ISO 24344:2012 (E) DIN EN ISO 24344:2012-04 7 9 Test report The test report shall contain the following information: a) a reference to this International Standard, ISO 24344, Method A or B; b) a
43、 complete identification of the product tested, including type, source, colour and manufacturers reference numbers; c) previous history of the sample; d) for method A, the appearance of cracking, etc. after testing with the specified product mandrel, together with the diameter of the mandrel used; e
44、) for method B, whether or not cracking has occurred at a specific deflection; f) deflection for each specimen, information about the direction of the long dimension of the sample (that is, the machine direction or across-machine direction); g) any deviation from this International Standard which ma
45、y have affected the results; h) the date of the test. 10 Precision and bias statement Due to the subjective nature of these test methods, no precision and bias can be established. EN ISO 24344:2012 (E) DIN EN ISO 24344:2012-04 8 Bibliography 1 EN 435, Resilient floor coverings Determination of flexi
46、bility 2 ASTM F 137-03, Standard Test Method for Flexibility of Resilient Flooring Materials with Cylindrical Mandrel Apparatus 3 ASTM F 1304-03, Standard Test Method for Deflection of Resilient Floor Tile 4 JIS A 1454, Test methods Resilient floor coverings EN ISO 24344:2012 (E) DIN EN ISO 24344:2012-04 9
