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1、BRITISH STANDARD BS EN ISO 9073-7:1998 Textiles Test methods for nonwovens Part 7: Determination of bending length The European Standard EN ISO 9073-7:1998 has the status of a British Standard ICS 59.080.30 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:28:03 GMT+00:00 2006, Uncontrolled
2、Copy, (c) BSI BS EN ISO 9073-7:1998 This British Standard, having been 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 1998 BSI 05-1999 ISBN 0 580 30632 1 National foreword Thi
3、s British Standard is the English language version of EN ISO 9073-7:1998. It is identical with ISO 9073-7:1995. The UK participation in its preparation was entrusted to Technical Committee TCI/24, Physical testing of textiles, which has the responsibility to: aid enquirers to understand the text; pr
4、esent 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. A list of organizations represented on this committee can
5、 be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement inte
6、rnational or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to inc
7、lude 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 legal obligations. Summary of pages This document comprises a front cover, an inside front cover, page
8、s i and ii, the EN ISO title page, page 2, the ISO title page, pages ii to iv, pages 1 to 4, 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 indicated in the amendment table on the inside front cover. A
9、mendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:28:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 9073-7:1998 BSI 05-1999i Contents Page National foreword Inside front cover Foreword 2 Foreword iii Text of ISO 9073-7 1 Licens
10、ed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:28:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:28:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9073-7 July 1998 ICS 59.08
11、0.30 Descriptors: See ISO document English version Textiles Test methods for nonwovens Part 7: Determination of bending length (ISO 9073-7:1995) Textiles Mthodes dessai pour nontisss Partie 7: Dtermination de la longueur de flexion (ISO 9073-7:1995) Textilien Prfverfahren fr Vliesstoffe Teil 7: Best
12、immung der Biegelnge (ISO 9073-7:1995) This European Standard was approved by CEN on 1 July 1998. 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
13、-date lists 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
14、the responsibility 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemb
15、ourg, Netherlands, Norway, 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 1998 CEN All rights of exploitation in any form and by
16、 any means reserved worldwide for CEN national Members. Ref. No. EN ISO 9073-7:1998 E Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:28:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9073-7:1998 BSI 05-1999 2 Foreword The text of the International Standard from Technical Committee I
17、SO/TC 38 “Textiles” of the International Organization for Standardization (ISO) has been taken over as an European Standard by Technical Committee CEN/TC 248 “Textiles and textile products”, the secretariat of which is held by BSI. This European Standard shall be given the status of a national stand
18、ard, either by publication of an identical text or by endorsement, at the latest by January 1999, and conflicting national standards shall be withdrawn at the latest by January 1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries ar
19、e bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard I
20、SO 9073-7:1998 has been approved by CEN as a European Standard without any modification. NOTENormative references to International Standards are listed in Annex ZA (normative). Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:28:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: s
21、heffieldun sheffieldun, na, Sun Nov 19 13:28:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9073-7:1998 ii BSI 05-1999 Contents Page Foreword iii 1Scope1 2Normative references1 3Definitions1 4Principle1 5Apparatus1 6Sampling1 7Preparation and conditioning of test pieces1 8Procedure2 9Expressio
22、n of results3 10Test report3 Annex A (informative) Flexural rigidity, bending length and overhanging length4 Annex ZA (normative) Normative references to international publications with their relevant European publicationsInside back cover Figure 1 Apparatus for measuring bending length2 Licensed Co
23、py: sheffieldun sheffieldun, na, Sun Nov 19 13:28:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9073-7:1998 BSI 05-1999iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Intern
24、ational Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with
25、 ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an
26、International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 9073-7 was prepared by Technical Committee ISO/TC 38, Textiles. ISO 9073 consists of the following parts, under the general title Textiles Test methods for nonwovens: Part 1: Det
27、ermination of mass per unit area; Part 2: Determination of thickness; Part 3: Determination of tensile strength and elongation; Part 4: Determination of tear resistance; Part 7: Determination of bending length; Part 8: Determination of liquid strike-through time (simulated urine); Part 9: Determinat
28、ion of drape coefficient. Annex A of this part of ISO 9073 is for information only. Descriptors: Textiles, fabrics, non-woven fabrics, tests, bend tests, determination, length. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:28:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank License
29、d Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:28:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9073-7:1998 BSI 05-19991 1 Scope This part of ISO 9073 specifies a method for determining the bending length of a nonwoven fabric. An equation is given for calculating the flexural rigidity of
30、the fabric from the bending length. The method is not applicable to combination-type materials (composites or laminates) in which there can be a natural twist. NOTE 1This International Standard describes a test method specific to nonwovens. Other International Standards applicable to textile, paper,
31、 plastics, rubber or other materials can also be applied to test certain nonwoven characteristics. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 9073. At the time of publication, the editions indicat
32、ed were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 9073 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid Internation
33、al Standards. ISO 139:1973, Textiles Standard atmospheres for conditioning and testing. ISO 186:1994, Paper and board Sampling to determine average quality. ISO 9073-1:1989, Textiles Test methods for nonwovens Part 1: Determination of mass per unit area. 3 Definitions For the purposes of this part o
34、f ISO 9073, the following definitions apply. 3.1 bending length length of a rectangular strip of fabric, fixed at one end and free at the other, that will bend under its own weight to an angle of 7,1 3.2 flexural rigidity ratio of small changes in bending moment per unit width of the material to cor
35、responding small changes in curvature NOTE 2Flexural rigidity can be calculated from the bending length. 4 Principle A rectangular strip of fabric is supported on a horizontal platform with the long axis of the strip parallel to the long axis of the platform. The strip is advanced in the direction o
36、f its length so that an increasing part overhangs the platform and bends down under its own weight. The overhang is free at one end, and fixed at the other from the pressure applied by a slide on the part of the test piece still on the platform. When the leading edge of the test piece has reached a
37、plane passing through the edge of the platform and inclined at an angle of 41,5 below the horizontal, the overhanging length will equal twice the bending length of the test piece (see Annex A), and thus the bending length can be calculated. 5 Apparatus A suitable apparatus is shown in Figure 1. 5.1
38、Level table. 5.2 Platform, of width (40 2) mm and length (200 2) mm, supported at a height of at least 150 mm above the surface of the table (5.1). Each side of the platform support shall be transparent and marked with a line (L1 and L2 respectively; see Figure 1) running from the end of the platfor
39、m at an angle of 41,5 below the horizontal. A mark (D) shall be made on the platform at (10 1) mm from the front edge (see Figure 1). NOTE 3To avoid adherence of the test piece, the platform should be coated or covered with polytetrafluoroethylene (PTFE). 5.3 Steel rule, (25 1) mm, length (350 1) mm
40、 of width and mass (250 10) g, accurately graduated in millimetres, and with a rubber-covered underside. NOTE 4A rule made of steel plate 3,5 mm thick will have the correct mass. 6 Sampling Carry out sampling in accordance with ISO 186. 7 Preparation and conditioning of test pieces 7.1 Cut out six t
41、est pieces (25 1) mm (250 1) mm with their long edges parallel to the textile manufacturing machine direction (MD) and an equal number of test pieces with their long edges in the perpendicular, or cross-machine, direction (CD). The test pieces shall be taken at least 50 mm from the edge of the fabri
42、c and the test pieces shall be handled as little as possible. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:28:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9073-7:1998 2 BSI 05-1999 NOTE 5Fabrics which tend to curl or twist should be conditioned before cutting out the test pieces
43、. If the test pieces curl or twist seriously, they can often be made to lie flat long enough for testing by pressing lightly between flat surfaces for several hours. NOTE 6Additional samples may be taken at an angle of 45 to the machine direction. NOTE 7For production control, the number of test pie
44、ces may be limited to three in each direction (MD and CD). 7.2 Condition the test pieces and carry out the test in one of the standard atmospheres specified in ISO 139. 8 Procedure 8.1 Weigh the test piece and calculate the mass per unit area in grams per square metre in accordance with ISO 9073-1.
45、8.2 Place the apparatus on the level table (5.1). Place the test piece on the platform with one end coinciding with the front edge of the platform. Place the steel rule (5.3) on the test piece with the zero of the scale in line with the mark D on the platform. Push the steel rule forward so that the
46、 test piece projects over the front edge of the platform and bends down under its own weight. Move the rule forward at a constant speed (this can be facilitated by using an apparatus fitted with a motorized drive, see note 7) until the overhanging end of the test piece reaches the two lines on the p
47、latform support L1 and L2. After an interval of (8 2) s, read on the scale on the steel rule the overhanging length of the test piece. NOTE 8Information on a suitable apparatus fitted with a motorized drive can be provided by the following associations in the nonwovens industry: INDA, 1001 Winstead
48、Drive, Suite 460, Cary, NC 27513, USA; EDANA, 157 av. Eugne Plasky, B-1040 Brussels. 8.3 Repeat the operation in 8.2 with the other face of the test piece up, and again at the other end of the test piece, first with the original face up and then with the test piece turned over. Figure 1 Apparatus fo
49、r measuring bending length Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:28:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9073-7:1998 BSI 05-19993 NOTE 9It may be helpful to place the apparatus so that the zero of the scale on the rule lies towards the observer and at a level that enables the scale to be read with comfort. The position of the end of the test piece relative to L1 and L2 may be observed in a mirror suitably placed or attached to one side of the apparatus.